Some standard content:
National Standard of the People's Republic of China
Retreading and repair of tires (diagonal)
Retreading and repair of tires (diagonal) Chapter 1 Retreading tires
1 Subject content and scope of application||tt ||GB 7037-92
Replaces G7037-86
This standard specifies the technical requirements for tire selection of used tires for retreading and the quality and technical requirements that the retreaded products should meet, as well as the corresponding test methods. Inspection rules and markings for finished products are also specified. This standard applies to the retreading of pneumatic tires for cars, trucks, agriculture, small and medium-sized engineering machinery, industrial vehicles, animal-drawn vehicles and their trailers with bias structures.
2 cited standards
GB519 Test method for physical and mechanical properties of pneumatic tires GB521 Method for determination of outer edge dimensions of pneumatic tires GB 528
GB531
GB532
Vulcanized rubber pull Determination of elongation properties
Rubber Shore A hardness test method
Determination of adhesive strength of vulcanized rubber and fabric GB533
Determination method of density of vulcanized rubber
Wear resistance of vulcanized rubber Determination (using Akron abrasion machine) GB 1689
GB4501
Truck tire durability test method
GB4502 Passenger car tire durability test method (drum method) GB6326 tire terminology and its Definition
3 Terms
3.1 Hole size: refers to the sum of the length and width of the bottom of the hole after polishing. 3.2 The total length of the hole: refers to the total length of the hole that has been repaired in the past. 3.3 Spacing between two holes: refers to the minimum distance between the edges of two holes. 3.4 Nail holes: refers to hard holes with a hole diameter within 6mm. 4 Tire Classification
4.1 Carcass Classification: In the technical requirements for tire retreading and selection of pneumatic tires for cars and trucks, according to the integrity of the tire carcass, the tires for cars and light trucks are divided into two levels: A and B. Truck tires are divided into three levels: A, B and C. The remaining tires are not rated. 4.2 Finished tire classification: In the technical requirements for retreading finished products of pneumatic tires for cars and trucks, the finished tires for cars and light trucks are also divided into A and B according to the quality grade of the tire carcass and the quality indicators achieved by the finished products. Two levels, the finished truck tires are divided into three levels: A, B and C. Other retreading products are not graded. State Bureau of Technical Supervision approved 174 on September 01, 1992 | 1 Class A retreaded carcass must meet the following requirements: GB 7037-92
5.1.1.1 The remaining pattern at the tread crown pattern depth measurement point, truck tires are not less than 2mm; car tires are not less than 1.6mm, local wear Do not damage the buffer layer.
5.1.1.2 No rolling thread is allowed in the tire.
5.1.1.3 Aging cracks are not allowed on the sidewalls. 5.1.1.4 The depth of mechanical damage to the sidewall rubber of load-carrying tires shall not damage the ply, and the number of cracks shall not exceed 2. 5.1.1.5 No hollowing or delamination is allowed in any part of the tire. 5.1.1.6 The bead wrapper shall not be mechanically damaged or severely worn, and the bead shall not be deformed. 5.1.1.7 Car tires should be free from damage. For light truck tires, the tire crown is allowed to have one nail hole below 6mm or two nail holes below 3mm. The tire crown of a truck is allowed to have one puncture or three nail holes with a diameter of less than 10mm. 5.1.1.8 Retreaded tire casings must be unretreaded or unrepaired tires. 5.1.2 Class B retreaded carcass must meet the following requirements. 5.1.2.1 The crown pattern depth measurement point pattern is allowed to be ground flat but not deep enough to the ply. 5.1.2.2 There is no delamination between the buffer layer and the ply layer at the crown area, and between the ply layer and the ply layer. There are no threads in the womb. 5.1.2.3 Slight aging cracks and cuts are allowed on the sidewall rubber, but they must not be as deep as the ply. 5.1.2.4 Partial voiding is allowed between the tire shoulder, sidewall rubber and ply, and the total length shall not exceed 1/5 week. 5.1.2.5 The chafing cloth is allowed to suffer mechanical damage and wear. The bead must not be damaged or deformed. 5.1.2.6 If the crown, shoulder or sidewall ply is damaged to 50% of the carcass layers or less (including the tire shoulder being hollowed out), the number shall not exceed 3, and the total length shall not exceed the nominal section width of the tire of the same specification. 40%. 5.1.2.7 The maximum size allowed for car tire carcass punctures (including ply damage of more than 50% of the carcass layers) is: the crown is less than $15mm, the shoulder and sidewall are less than $6mm, and the total number must not exceed 2 holes. . The distance between two holes shall not be less than 100mm. The maximum dimensions allowed for holes in the truck tire body (including those where the ply layer is damaged by more than 50% of the carcass layers) are as shown in Table 1. Table 1 Maximum size of the carcass allowed for punctures
Maximum size of the carcass allowed for punctures
Tire categories
Light truck tires
Truck tires
Crown
30%
40%
(not exceeding the percentage of the nominal section width of the same specification tire) Shoulder
20%
30%| |tt||Sidewall
20%
30%
Note: (DIf the distance between two holes is less than 100mm, it is calculated as one hole, and its length should include the distance between two holes The total length of the hole
40%
50%
②) Permissible range of punctures: measured along the tire lining, the minimum distance from the tire toe to the hole is based on the nominal size of the tire (cm ) is determined by the first digit. For example, 9.00-20 is 9cm, 7.50-16 is 7cm, and 1200-20 is 12cm. 5.1.3 Class C retreaded carcass must meet the following requirements: 5.1.3.1 The crown pattern depth measurement point pattern is allowed to be ground flat. The buffer layer is allowed to wear locally, and its total length does not exceed 1/6 week. 5.1.3.2 There is no delamination between the buffer layer and the ply in the crown area, and between the ply and the ply. There are no threads in the womb. 5.1.3.3 The sidewall rubber is allowed to have slight aging cracks and cuts, but they must not be as deep as the ply layer. 5.1.3.4 There is allowed to be partial voiding between the tire shoulder, sidewall rubber and the ply layer, and the total length does not exceed 1/5 week. 5.1.3.5 The chafing cloth is allowed to suffer mechanical damage and wear. The bead must not be damaged or deformed. 5.1.3.6 If the crown, shoulder or sidewall ply is damaged to 50% of the carcass layers or less (including the shoulder being hollowed out), its individual length shall not exceed 80% of the nominal section width of the tire of the same specification, and its total length shall not exceed 80% of the nominal section width of the tire of the same specification. No more than 180% of the nominal section width of tires of the same specification. 175 | | tt | Table 2 Maximum size of the carcass allowed for punctures
Maximum size of the carcass allowed for punctures
Tire categories
Trucks, agriculture, small and medium-sized industries
Engineering machinery, industry Pneumatic tires for vehicles, animal-drawn vehicles
and their trailers
crown
80%
(not exceeding the percentage of the nominal section width of tires of the same specification) tire shoulders || tt ||60% ||tt | The total length of the hole
180%
② Permissible range of punctures: measured along the tire lining, the minimum distance from the tire toe to the hole is determined by the number of centimeters prefixed to the nominal size of the tire. For example, 9.00-20 is 9 cm, 7.50-16 is 7cm, and 12.00-20 is 12 cm. 5.2 Technical requirements for the retreading of pneumatic tires for agriculture, small and medium-sized engineering machinery, industrial vehicles, animal-drawn vehicles and their trailers. 5.2.1 The remaining tread depth at the crown pattern depth measurement point: not less than 2mm for small and medium-sized engineering machinery and agricultural tires. 5.2.2 The buffer layer is allowed to be partially worn down to two layers without the carcass becoming hollow. Rolling wires and jumpers throughout the tire are not allowed in the tire. 5.2.3 Partial delamination is allowed between the buffer layers and between the buffer layers and the carcass. The length of a single tire shall not exceed 40% of the nominal section width of the tire of the same specification. The total length does not exceed 1/8 week.
5.2.4 Slight aging cracks and cuts are allowed in the sidewall rubber, but they must not be as deep as the ply. 5.2.5 Partial voids are allowed between the tire shoulder, sidewall rubber and ply, and the total length shall not exceed 1/5 week. 5.2.6 The bead wrapper is allowed to have local mechanical damage and wear, but the bead wire must not be damaged. The bead is not allowed to deform. 5.2.7 The maximum size allowed for holes in the carcass (including those where the ply layer is damaged by more than 50% of the carcass layers) is as per the requirements in Table 2. Technical requirements for finished retreaded tires
6
6.1
The physical and mechanical properties of finished tread rubber for various retread tires are as shown in Table 3. Table 3 Physical and mechanical properties of finished tread rubber
refers to
performance name
hardness
tensile strength
300% modulus stress||tt| |Tear elongation
Akron wear
Adhesion
Strength
Interface between tread rubber and original tire
Packing and carcass Interface
Note: Use type 2 cutter.
Single
bit
Shore A type, degree
MPa
%
cm2/1.61km
kN /m
Car tires
60±5
≥15.0
Light load, load
Heavy car tires
61±5| |tt||≥17.0
10.0±3.0
standard
agricultural, industrial vehicles,
animal-drawn vehicle tires
61±7||tt| |≥16. 5
≥420
N0.3
≥7.0
>5.0
N0.4bzxz.net
Small and medium-sized projects
Mechanical tires
61±7
≥20.0
12.0±3.0
6.2 Adhesion quality within the finished product: Any part inside the finished tire must be adhered Attach it tightly and do not allow honeycombing, voiding or delamination. 6.3 Appearance quality of retreaded tires
6.3.1 The appearance of retreaded tires for cars and light trucks should be uniform and neat, without defects such as scratches, bubbles, heavy skin, mixed impurities, obvious dirt and other appearance defects. The thickness of the base of the tire crown rubber edge shall not be greater than 1.5mm. 6.3.2 The permitted appearance quality of pneumatic tires for trucks, agriculture, small and medium-sized engineering machinery, industrial vehicles, animal-drawn vehicles and their trailers is as shown in Table 176
GB 7037-92
4. Within the allowable range, the number of appearance defects shall not exceed 6 items. Table 4 Appearance quality of retreaded tires
item
1
from
2
.3
5
6| |tt||7
8
9
11
12
Defect name
Tread crown rubber edge
The model seam is misaligned
The rubber at the base of the pattern is too thin
The tread pattern is missing glue or has rounded corners
The tread pattern is collapsed
The pattern is misaligned and the pattern is incomplete|| tt||Shoulder surface sponge
Tread reconstruction
Pits and solid drums in the tire
Sidewall model impressions
Sidewall crown impurity imprints|| tt||The small dots of the liner are hollow
refers to
the width of the base of the rubber edge is not greater than 4.0mm
not greater than 3.0mm
exposed file marks are not allowed||tt ||Mark
The depth does not exceed 3mm, the cumulative length does not exceed 1/4 week and does not exceed 1/3 of the pattern depth; the total length does not exceed 1/5 week: no pieces are allowed to fall off, and the base of the pattern does not crack|| tt||The misalignment is not greater than 1/4 of the pattern pitch;
One missing flower is allowed
The allowable depth is no more than 1.5mm, and the length is no more than 1/5 week. It is allowed to renovate according to the original pattern. The length is not more than 1/5 week, the depth and height are not more than 3mm respectively, the length is not more than 1/5 week
The depth is not more than 3 mm
The allowed depth at the crown is not more than 30% of the thickness of the tread rubber %, the depth of the sidewall shall not be greater than 40% of the thickness of the sidewall rubber, and there shall be no more than 2 places outside the 75mm perimeter of the hole. 2 small spots within 10mm in diameter are allowed
&
Except for false drums with slush patterns
Note: Retreaded tires have other appearance defects that do not meet the scope of this standard, such as sidewall aging caused by re-vulcanization, under-sulfur or severe over-sulfur, bead damage and deformation, etc. All are substandard products. | |tt | For example, the product of the outer diameter and cross-sectional width of a retreaded tire shall not exceed the product of the new tire by 10%. 6.5 The durability performance test indicators of Class A and B retreaded tires are shown in Table 5. Class C truck tires and other ungraded tires are only assessed for 6.1 to 6.4 and not for durability performance.
Table 5 Durability performance of retreaded tires
Endurance
Long-lasting
Tire category
Car tire
Level
Grade A Product
Class B product
Load rate·time
75%·4h
97%·6h
114%-48 h||tt| |75% -4 h
97%·6 h
114%·24h
Performance
Performance
Test speed
( km/h)
56
177
tire category
light truck tires
car tires
level
Class A product
Class B product
Class A product
Class B product
6.6 Retreaded tire use and guaranteed mileage: GB7037--92
Continued table 5
endurance
long-lasting
load rate·time
64%-7h
84%-16h
101%- 48h
64% -7 h
84%-16h
101%·24h
64%·7 h
84%·16h|| tt||101%·48h
64% ·7 h
84% -16 h
101%-24h
Sex
Energy|| tt||Test speed
(km/h)
48
6.6.1 For retreaded passenger car and truck tires, car tire users must comply with the technical specifications for tire use and maintenance of automobile transportation enterprises. , under the condition of reasonable use of tires, within 2 years from the date of production of retreaded tires, the retreading enterprise should ensure that the mileage of each retreaded Class A tire reaches 70% of the guaranteed mileage of new tires; the mileage of Class B tires reaches 60%; Class C tires reach 50%. 6.6.2 Retreaded tires used on access roads in mining areas, forest areas, and construction sites do not guarantee mileage according to the above conditions. 6.6.3 If the retreaded tires fail to reach the guaranteed driving mileage and are damaged early, if it is a quality problem with the retreaded tires, the retreading company shall provide free retreading or full compensation for the retreaded tires that cannot reach 1/4 of the guaranteed driving mileage; If the mileage exceeds 1/4 but does not reach the guaranteed mileage, the amount of compensation required is equivalent to the insufficient mileage. 7 Test methods
7.1 The hardness of the tread rubber of retreaded tires is measured according to GB531. 7.2 The tensile strength, modulus stress and elongation at break of the finished tread rubber of retreaded tires shall be sampled according to the provisions of GB519 and measured according to GB528, using the type 2 cutter of GB528.
7.3 The wear of the finished tread rubber of retreaded tires shall be sampled in accordance with the provisions of GB519, the density shall be measured in accordance with GB533, and the wear shall be measured in accordance with GB1689.
7.4 The adhesion strength between components of the finished retreaded tire shall be sampled in accordance with the provisions of GB519 and measured in accordance with GB532. 7.5 The durability performance of finished retreaded tires is measured according to GB4501 and GB4502. 7.6 The outer diameter and cross-sectional width of retreaded tires after inflation are measured according to GB521. 7.7 The adhesion quality of the finished retreaded tires can be tested by tapping with a hand hammer or other methods. The appearance quality can be inspected by methods such as ruler and visual inspection. 8 Inspection Rules
8.1 Finished retreaded tires shall be inspected by the quality inspection department of the manufacturer in accordance with this standard. 8.2 The appearance quality and adhesion quality of finished retreaded tires should be checked visually and by listening. If it does not meet the standard requirements, it can be repaired once. If it reaches the standard after repair, it will still be a qualified product. 8.3. Each tire retreading enterprise must check the outer edge size and physical and mechanical properties of retreaded tires in accordance with the provisions of this standard. Determine the sampling batch according to the production situation of the enterprise. The maximum number of batches shall not exceed 6,000 pieces (for enterprises with an annual output of more than 6,000 pieces, batches shall be at least every six months; for enterprises with an annual output of less than 6,000 pieces, batches shall be at least annually). Take one tire from each batch for inspection. If the inspection result is that one item of 178
GB7037-92
is unqualified, another two tires should be taken from the batch and the unqualified item should be inspected. Recheck. If one tire is still unqualified for one item during the re-inspection, the batch of products is deemed to be unqualified
8.4 Durability test: Passenger car tires among retreaded tires, light-duty truck tires and heavy-duty truck tires Finished Class A and B tires must be sampled for durability testing. Take one piece from each batch, and the sampling batch is determined based on the quantity of the carcass produced by the enterprise. The maximum number of each batch shall not exceed 6,000. Enterprises that retread this type of carcass with an annual output of less than 6,000 carcasses will be considered as one batch per year. If they fail, another two tires from the batch should be taken for re-inspection. If they still fail the re-inspection, they will be downgraded for use. If the re-inspection of state-of-the-art car tires and light-duty truck tires still fails the re-inspection, the batch of retreaded car tires and light-duty truck tires will be deemed unqualified. 9 mark
9.1 Name of the tire retreading company;
9.2 Tire finished product grade (i.e. Class A, Class B, Class C); 9.3 Inspection seal:
9.4 On the retreaded tire .9.1 Die-engraved seals are required; the rest should be stamped with inspection seals and Class A, B, and C seals after passing the inspection. The seal can be made with a material that cannot be washed away with water.
Part 2 Repaired Tires
10 Subject Content and Scope of Application
This standard specifies the technical requirements for tire selection, finished product quality technical requirements, test methods, inspection rules and markings for repaired tires . This standard applies to the repair of pneumatic tires for cars, trucks, agriculture, small and medium-sized engineering machinery, industrial vehicles, animal-drawn vehicles and their trailers with bias structures.
11 cited standards
GB519
Pneumatic tire physical and mechanical properties test method Pneumatic tire outer edge size determination method
GB5213
GB528
Determination of tensile properties of vulcanized rubber
GB531
Rubber Shore A hardness test method
GB532
GB533
GB1689
GB6326| | tt | |12.1 Hole size: refers to the length and width of the bottom of the hole after polishing. 12.2 The total length of the hole: refers to the total length of the hole that has been repaired in the past. 12.3 Spacing between two holes: refers to the minimum distance between the edges of two holes. 12.4 Nail holes: refers to hard holes with a diameter of less than 6 mm. 13 Technical requirements for repairing tire selection
13.1 Technical requirements for repairing and selecting pneumatic tires for cars and trucks. 13.1.1 The remaining tread depth at the crown tread depth measurement point shall not be less than 1/4 of the tread depth of new tires of the same specification. 13.1.2 The single hollow length of the carcass, for light truck tires, shall not exceed 30% of the nominal cross-sectional width of the tires of the same specification. %, truck tires shall not exceed 80%. The total free length: light truck tires shall not exceed 40% of the nominal section width of tires of the same specification, and truck tires shall not exceed 180%. Car tires are not allowed to have hollow carcasses. GB7037—92
13.1.3 Partial jumpers are allowed in truck tires. The number of layers shall not exceed one, and the total length shall not exceed 1/5 of the circumference of the inner circle. Local jumpers are not allowed on car tires.
13.1.4 Slight aging is allowed on the sidewall, but the ply must not be damaged. 13.1.5 Partial voids are allowed between the tire shoulder, sidewall rubber and ply, and the total length shall not exceed 1/5 week. 13.1.6 The chafer fabric is allowed to have mechanical damage or damage, but the steel wire must not be exposed. The bead is not allowed to deform. 13.1.7 The maximum size of holes allowed in the carcass (including those where the ply layer is damaged by more than 50% of the carcass layers): the crown part of the car tire is less than 5mm. The shoulder and sidewall parts are less than 6mm. The total number shall not exceed 2 holes. The distance between two holes shall not be less than 100mm. Light truck tires are shown in Table 1 of Chapter -. For truck tires, see Table 2 of Chapter 1. 13.2 Technical requirements for repair and tire selection of pneumatic tires for agriculture, small and medium-sized engineering machinery, industrial vehicles, animal-drawn vehicles and their trailers. 13.2.1 The remaining tread depth at the tread crown pattern depth measurement point shall not be less than 1/4 of the tread depth of a new tire of the same specification. 13.2.2 Local delamination is allowed between the buffer layers and between the buffer layers and the ply. The length of a single void shall not exceed 40% of the nominal section width of the tire of the same specification, and the total length shall not exceed 1/8 week. 13.2.3 Slight aging cracks are allowed on the sidewall, and partial voids are allowed between the tire shoulder, sidewall rubber and ply, with the total length not exceeding 1/5 week.
13.2.4 Slight jumpers are allowed in the tires. The number of layers shall not exceed one, and the total length shall not exceed 1/5 of the circumference of the inner circle. 13.2.5 The bead wrapper is allowed to have mechanical damage or wear, but the steel wire must not be exposed. The bead is not allowed to deform. 13.2.6 Punctures are allowed in the carcass (including those that damage more than 50% of the carcass layers). The maximum size is shown in Table 2 of Chapter 1. 14 Technical requirements for repaired tire finished products
14.1 Finished tread rubber physical machinery The performance requirements are the same as Table 3 in Chapter 1. 14.2 Adhesion quality requirements for repaired tires: The repaired parts inside the carcass must be tightly bonded. Between the liner and the carcass, 2 small spots with a diameter of less than 10mm are allowed outside of 75mm around the hole. Empty. No voids, delaminations or sponges are allowed in any other parts of the tire that would affect the service life of the tire.
14.3 Appearance quality requirements for repaired tires: 14.3.1 No parts of the repaired tire that should be repaired are left out, and any parts that can affect the use of the tire are not allowed. All parts of the service life have been repaired and repaired. 14.3.2 The repaired area has clear patterns, and if the tire crown repair area exceeds one pattern, similar patterns must be carved, preferably the same pattern. If tread blocks are used for repair, the same pattern should be used.
14.3.3 The new glue in the heating zone of the repair area is not allowed to have aging cracks, and there is no lack of sulfur or insufficient sulfur. 14.3.4 The bead diameter must remain the original tire diameter, and no deformation of the bead is allowed after repair. 14.3.5 The unevenness of the pad in the repaired area of ??the tire shall not be greater than 5mm. 15 Test methods
15.1 The hardness of the finished tread rubber of repaired tires is measured according to GB531. 15.2 The tensile strength, elongation stress and elongation at break of the finished tire tread rubber of repaired tires shall be sampled according to the provisions of GB519 and measured according to GB528.
15.3 The wear of the finished tread rubber of repaired tires shall be sampled in accordance with the provisions of GB519, the density shall be measured in accordance with GB533, and the wear shall be measured in accordance with GB1689. 15.4 The adhesion strength between the components of the repaired tire product shall be sampled in accordance with the provisions of GB519 and measured in accordance with GB532. 15.5 The adhesion quality of the finished tire repair can be checked by tapping with a hand hammer. 15.6 The appearance quality of the repaired tires can be checked with a ruler and visual inspection. 16 Inspection Rules
16.1 The finished tire after repair shall be inspected by the quality inspection department of the production unit in accordance with this standard. 180
GB7037-92
16.2 The quality inspection of repaired tires shall be carried out in accordance with the relevant provisions of 15.1, 15.2, 15.3 and 15.4 of this standard. 16.3 The sampling requirements for the appearance quality inspection and outer edge size of repaired tires, and the physical and mechanical properties inspection of tread rubber shall be carried out in accordance with the provisions of 8.2 and 8.3 in the retread tire section of this standard.
17 mark
17.1 Inspection seal (including company name, whether it is a qualified product); 17.2 Repair the mark on the tire 17.1 The mark can be washed with water. Additional notes:
This standard is proposed by the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the National Tire and Rim Standardization Technical Committee. This standard is drafted by the Guilin Rubber Industry Design Institute of the Ministry of Chemical Industry. The main drafters of this standard are Gao Xiaoheng and Lu Younan. 181
4 Durability test: Retreaded tires for passenger cars, light truck tires, and finished grade A and B tires for truck tires must be sampled for durability testing. Take one piece from each batch, and the sampling batch is determined based on the quantity of the carcass produced by the enterprise. The maximum number of each batch shall not exceed 6,000. Enterprises that retread this type of carcass with an annual output of less than 6,000 carcasses will be considered as one batch per year. If they fail, another two tires from the batch should be taken for re-inspection. If they still fail the re-inspection, they will be downgraded for use. If the re-inspection of state-of-the-art car tires and light-duty truck tires still fails the re-inspection, the batch of retreaded car tires and light-duty truck tires will be deemed unqualified. 9 mark
9.1 Name of the tire retreading company;
9.2 Tire finished product grade (i.e. Class A, Class B, Class C); 9.3 Inspection seal:
9.4 On the retreaded tire .9.1 Die-engraved seals are required; the rest should be stamped with inspection seals and Class A, B, and C seals after passing the inspection. The seal can be made with a material that cannot be washed away with water.
Part 2 Repaired Tires
10 Subject Content and Scope of Application
This standard specifies the technical requirements for tire selection, finished product quality technical requirements, test methods, inspection rules and markings for repaired tires . This standard applies to the repair of pneumatic tires for cars, trucks, agriculture, small and medium-sized engineering machinery, industrial vehicles, animal-drawn vehicles and their trailers with bias structures.
11 cited standards
GB519
Pneumatic tire physical and mechanical properties test method Pneumatic tire outer edge size determination method
GB5213
GB528
Determination of tensile properties of vulcanized rubber
GB531
Rubber Shore A hardness test method
GB532
GB533
GB1689
GB6326| | tt | |12.1 Hole size: refers to the length and width of the bottom of the hole after polishing. 12.2 The total length of the hole: refers to the total length of the hole that has been repaired in the past. 12.3 Spacing between two holes: refers to the minimum distance between the edges of two holes. 12.4 Nail holes: refers to hard holes with a diameter of less than 6 mm. 13 Technical requirements for repairing tire selection
13.1 Technical requirements for repairing and selecting pneumatic tires for cars and trucks. 13.1.1 The remaining tread depth at the crown tread depth measurement point shall not be less than 1/4 of the tread depth of new tires of the same specification. 13.1.2 The single hollow length of the carcass, for light truck tires, shall not exceed 30% of the nominal cross-sectional width of the tires of the same specification. %, truck tires shall not exceed 80%. The total free length: light truck tires shall not exceed 40% of the nominal section width of tires of the same specification, and truck tires shall not exceed 180%. Car tires are not allowed to have hollow carcasses. GB7037—92
13.1.3 Partial jumpers are allowed in truck tires. The number of layers shall not exceed one, and the total length shall not exceed 1/5 of the circumference of the inner circle. Local jumpers are not allowed on car tires.
13.1.4 Slight aging is allowed on the sidewall, but the ply must not be damaged. 13.1.5 Partial voids are allowed between the tire shoulder, sidewall rubber and ply, and the total length shall not exceed 1/5 week. 13.1.6 The chafer fabric is allowed to have mechanical damage or damage, but the steel wire must not be exposed. The bead is not allowed to deform. 13.1.7 The maximum size of holes allowed in the carcass (including those where the ply layer is damaged by more than 50% of the carcass layers): the crown part of the car tire is less than 5mm. The shoulder and sidewall parts are less than 6mm. The total number shall not exceed 2 holes. The distance between two holes shall not be less than 100mm. Light truck tires are shown in Table 1 of Chapter -. For truck tires, see Table 2 of Chapter 1. 13.2 Technical requirements for repair and tire selection of pneumatic tires for agriculture, small and medium-sized engineering machinery, industrial vehicles, animal-drawn vehicles and their trailers. 13.2.1 The remaining tread depth at the tread crown pattern depth measurement point shall not be less than 1/4 of the tread depth of a new tire of the same specification. 13.2.2 Local delamination is allowed between the buffer layers and between the buffer layers and the ply. The length of a single void shall not exceed 40% of the nominal section width of the tire of the same specification, and the total length shall not exceed 1/8 week. 13.2.3 Slight aging cracks are allowed on the sidewall, and partial voids are allowed between the tire shoulder, sidewall rubber and ply, with the total length not exceeding 1/5 week.
13.2.4 Slight jumpers are allowed in the tires. The number of layers shall not exceed one, and the total length shall not exceed 1/5 of the circumference of the inner circle. 13.2.5 The chafer fabric is allowed to have mechanical damage or wear, but the steel wire must not be exposed. The bead is not allowed to deform. 13.2.6 Punctures are allowed in the carcass (including those that damage more than 50% of the carcass layers). The maximum size is shown in Table 2 of Chapter 1. 14 Technical requirements for repaired tire finished products
14.1 Finished tread rubber physical machinery The performance requirements are the same as Table 3 in Chapter 1. 14.2 Adhesion quality requirements for repaired tires: The repaired parts inside the carcass must be tightly bonded. Between the liner and the carcass, 2 small spots with a diameter of less than 10mm are allowed outside of 75mm around the hole. Empty. No voids, delaminations or sponges are allowed in any other parts of the tire that would affect the service life of the tire.
14.3 Appearance quality requirements for repaired tires: 14.3.1 No parts of the repaired tire that should be repaired are left out, and any parts that can affect the use of the tire are not allowed. All parts of the service life have been repaired and repaired. 14.3.2 The repaired area has clear patterns, and if the tire crown repair area exceeds one pattern, similar patterns must be carved, preferably the same pattern. If tread blocks are used for repair, the same pattern should be used.
14.3.3 The new glue in the heating zone of the repair area is not allowed to have aging cracks, and there is no lack of sulfur or insufficient sulfur. 14.3.4 The bead diameter must remain the original tire diameter, and no deformation of the bead is allowed after repair. 14.3.5 The unevenness of the pad in the repaired area of ??the tire shall not be greater than 5mm. 15 Test methods
15.1 The hardness of the finished tread rubber of repaired tires is measured according to GB531. 15.2 The tensile strength, elongation stress and elongation at break of the finished tire tread rubber of repaired tires shall be sampled according to the provisions of GB519 and measured according to GB528.
15.3 The wear of the finished tread rubber of repaired tires shall be sampled in accordance with the provisions of GB519, the density shall be measured in accordance with GB533, and the wear shall be measured in accordance with GB1689. 15.4 The adhesion strength between the components of the repaired tire product shall be sampled in accordance with the provisions of GB519 and measured in accordance with GB532. 15.5 The adhesion quality of the finished tire repair can be checked by tapping with a hand hammer. 15.6 The appearance quality of the repaired tires can be checked with a ruler and visual inspection. 16 Inspection Rules
16.1 The finished tire after repair shall be inspected by the quality inspection department of the production unit in accordance with this standard. 180
GB7037-92
16.2 The quality inspection of repaired tires shall be carried out in accordance with the relevant provisions of 15.1, 15.2, 15.3 and 15.4 of this standard. 16.3 The sampling requirements for the appearance quality inspection and outer edge size of repaired tires, and the physical and mechanical properties inspection of tread rubber shall be carried out in accordance with the provisions of 8.2 and 8.3 in the retread tire section of this standard.
17 mark
17.1 Inspection seal (including company name, whether it is a qualified product); 17.2 Repair the mark on the tire 17.1 The mark can be washed with water. Additional notes:
This standard is proposed by the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the National Tire and Rim Standardization Technical Committee. This standard is drafted by the Guilin Rubber Industry Design Institute of the Ministry of Chemical Industry. The main drafters of this standard are Gao Xiaoheng and Lu Younan. 181
4 Durability test: Retreaded tires for passenger cars, light truck tires, and finished grade A and B tires for truck tires must be sampled for durability testing. Take one piece from each batch, and the sampling batch is determined based on the quantity of the carcass produced by the enterprise. The maximum number of each batch shall not exceed 6,000. Enterprises that retread this type of carcass with an annual output of less than 6,000 carcasses will be considered as one batch per year. If they fail, another two tires from the batch should be taken for re-inspection. If they still fail the re-inspection, they will be downgraded for use. If the re-inspection of state-of-the-art car tires and light-duty truck tires still fails the re-inspection, the batch of retreaded car tires and light-duty truck tires will be deemed unqualified. 9 mark
9.1 Name of the tire retreading company;
9.2 Tire finished product grade (i.e. Class A, Class B, Class C); 9.3 Inspection seal:
9.4 On the retreaded tire .9.1 Die-engraved seals are required; the rest should be stamped with inspection seals and Class A, B, and C seals after passing the inspection. The seal can be made with a material that cannot be washed away with water.
Part 2 Repaired Tires
10 Subject Content and Scope of Application
This standard specifies the technical requirements for tire selection, finished product quality technical requirements, test methods, inspection rules and markings for repaired tires . This standard applies to the repair of pneumatic tires for cars, trucks, agriculture, small and medium-sized engineering machinery, industrial vehicles, animal-drawn vehicles and their trailers with bias structures.
11 cited standards
GB519
Pneumatic tire physical and mechanical properties test method Pneumatic tire outer edge size determination method
GB5213
GB528
Determination of tensile properties of vulcanized rubber
GB531
Rubber Shore A hardness test method
GB532
GB533
GB1689
GB6326| | tt | |12.1 Hole size: refers to the length and width of the bottom of the hole after polishing. 12.2 The total length of the hole: refers to the total length of the hole that has been repaired in the past. 12.3 Spacing between two holes: refers to the minimum distance between the edges of two holes. 12.4 Nail holes: refers to hard holes with a diameter of less than 6 mm. 13 Technical requirements for repairing tire selection
13.1 Technical requirements for repairing and selecting pneumatic tires for cars and trucks. 13.1.1 The remaining tread depth at the crown tread depth measurement point shall not be less than 1/4 of the tread depth of new tires of the same specification. 13.1.2 The single hollow length of the carcass, for light truck tires, shall not exceed 30% of the nominal cross-sectional width of the tires of the same specification. %, truck tires shall not exceed 80%. The total free length: light truck tires shall not exceed 40% of the nominal section width of tires of the same specification, and truck tires shall not exceed 180%. Car tires are not allowed to have hollow carcasses. GB7037—92
13.1.3 Partial jumpers are allowed in truck tires. The number of layers shall not exceed one, and the total length shall not exceed 1/5 of the circumference of the inner circle. Local jumpers are not allowed on car tires.
13.1.4 Slight aging is allowed on the sidewall, but the ply must not be damaged. 13.1.5 Partial voids are allowed between the tire shoulder, sidewall rubber and ply, and the total length shall not exceed 1/5 week. 13.1.6 The chafer fabric is allowed to have mechanical damage or damage, but the steel wire must not be exposed. The bead is not allowed to deform. 13.1.7 The maximum size of holes allowed in the carcass (including those where the ply layer is damaged by more than 50% of the carcass layers): the crown part of the car tire is less than 5mm. The shoulder and sidewall parts are less than 6mm. The total number shall not exceed 2 holes. The distance between two holes shall not be less than 100mm. Light truck tires are shown in Table 1 of Chapter -. For truck tires, see Table 2 of Chapter 1. 13.2 Technical requirements for repair and tire selection of pneumatic tires for agriculture, small and medium-sized engineering machinery, industrial vehicles, animal-drawn vehicles and their trailers. 13.2.1 The remaining tread depth at the tread crown pattern depth measurement point shall not be less than 1/4 of the tread depth of a new tire of the same specification. 13.2.2 Local delamination is allowed between the buffer layers and between the buffer layers and the ply. The length of a single void shall not exceed 40% of the nominal section width of the tire of the same specification, and the total length shall not exceed 1/8 week. 13.2.3 Slight aging cracks are allowed on the sidewall, and partial voids are allowed between the tire shoulder, sidewall rubber and ply, with the total length not exceeding 1/5 week.
13.2.4 Slight jumpers are allowed in the tires. The number of layers shall not exceed one, and the total length shall not exceed 1/5 of the circumference of the inner circle. 13.2.5 The bead wrapper is allowed to have mechanical damage or wear, but the steel wire must not be exposed. The bead is not allowed to deform. 13.2.6 Punctures are allowed in the carcass (including those that damage more than 50% of the carcass layers). The maximum size is shown in Table 2 of Chapter 1. 14 Technical requirements for repaired tire finished products
14.1 Finished tread rubber physical machinery The performance requirements are the same as Table 3 in Chapter 1. 14.2 Adhesion quality requirements for repaired tires: The repaired parts inside the carcass must be tightly bonded. Between the liner and the carcass, 2 small spots with a diameter of less than 10mm are allowed outside of 75mm around the hole. Empty. No voids, delaminations or sponges are allowed in any other parts of the tire that would affect the service life of the tire.
14.3 Appearance quality requirements for repaired tires: 14.3.1 No parts of the repaired tire that should be repaired are left out, and any parts that can affect the use of the tire are not allowed. All parts of the service life have been repaired and repaired. 14.3.2 The repaired area has clear patterns, and if the tire crown repair area exceeds one pattern, similar patterns must be carved, preferably the same pattern. If tread blocks are used for repair, the same pattern should be used.
14.3.3 The new glue in the heating zone of the repair area is not allowed to have aging cracks, and there is no lack of sulfur or insufficient sulfur. 14.3.4 The bead diameter must remain the original tire diameter, and no deformation of the bead is allowed after repair. 14.3.5 The unevenness of the pad in the repaired area of ??the tire shall not be greater than 5mm. 15 Test methods
15.1 The hardness of the finished tread rubber of repaired tires is measured according to GB531. 15.2 The tensile strength, elongation stress and elongation at break of the finished tire tread rubber of repaired tires shall be sampled according to the provisions of GB519 and measured according to GB528.
15.3 The wear of the finished tread rubber of repaired tires shall be sampled in accordance with the provisions of GB519, the density shall be measured in accordance with GB533, and the wear shall be measured in accordance with GB1689. 15.4 The adhesion strength between the components of the repaired tire product shall be sampled in accordance with the provisions of GB519 and measured in accordance with GB532. 15.5 The adhesion quality of the finished tire repair product can be checked by tapping with a hand hammer. 15.6 The appearance quality of the repaired tires can be checked with a ruler and visual inspection. 16 Inspection Rules
16.1 The finished tire after repair shall be inspected by the quality inspection department of the production unit in accordance with this standard. 180
GB7037-92
16.2 The quality inspection of repaired tires shall be carried out in accordance with the relevant provisions of 15.1, 15.2, 15.3 and 15.4 of this standard. 16.3 The sampling requirements for the appearance quality inspection and outer edge size of repaired tires, and the inspection of physical and mechanical properties of tread rubber shall be carried out in accordance with the provisions of 8.2 and 8.3 in the retread tire section of this standard. || tt | Additional notes:
This standard is proposed by the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the National Tire and Rim Standardization Technical Committee. This standard is drafted by the Guilin Rubber Industry Design Institute of the Ministry of Chemical Industry. The main drafters of this standard are Gao Xiaoheng and Lu Younan. 181
1 needs to be stamped with stamps; the rest should be stamped with inspection seals and Class A, B, and C seals after passing the inspection. The seal can be made with a material that cannot be washed away with water.
Part 2 Repaired Tires
10 Subject Content and Scope of Application
This standard specifies the technical requirements for tire selection, finished product quality technical requirements, test methods, inspection rules and markings for repaired tires . This standard applies to the repair of pneumatic tires for cars, trucks, agriculture, small and medium-sized engineering machinery, industrial vehicles, animal-drawn vehicles and their trailers with bias structures.
11 cited standards
GB519
Pneumatic tire physical and mechanical properties test method Pneumatic tire outer edge size determination method
GB5213
GB528
Determination of tensile properties of vulcanized rubber
GB531
Rubber Shore A hardness test method
GB532
GB533
GB1689
GB6326| | tt | |12.1 Hole size: refers to the length and width of the bottom of the hole after polishing. 12.2 The total length of the hole: refers to the total length of the hole that has been repaired in the past. 12.3 Spacing between two holes: refers to the minimum distance between the edges of two holes. 12.4 Nail holes: refers to hard holes with a diameter of less than 6 mm. 13 Technical requirements for repairing tire selection
13.1 Technical requirements for repairing and selecting pneumatic tires for cars and trucks. 13.1.1 The remaining tread depth at the crown tread depth measurement point shall not be less than 1/4 of the tread depth of new tires of the same specification. 13.1.2 The single hollow length of the carcass, for light truck tires, shall not exceed 30% of the nominal cross-sectional width of the tires of the same specification. %, truck tires shall not exceed 80%. The total free length: light truck tires shall not exceed 40% of the nominal section width of tires of the same specification, and truck tires shall not exceed 180%. Car tires are not allowed to have hollow carcasses. GB7037—92
13.1.3 Partial jumpers are allowed in truck tires. The number of layers shall not exceed one, and the total length shall not exceed 1/5 of the circumference of the inner circle. Local jumpers are not allowed on car tires.
13.1.4 Slight aging is allowed on the sidewall, but the ply must not be damaged. 13.1.5 Partial voids are allowed between the tire shoulder, sidewall rubber and ply, and the total length shall not exceed 1/5 week. 13.1.6 The chafer fabric is allowed to have mechanical damage or damage, but the steel wire must not be exposed. The bead is not allowed to deform. 13.1.7 The maximum size of holes allowed in the carcass (including those where the ply layer is damaged by more than 50% of the carcass layers): the crown part of the car tire is less than 5mm. The shoulder and sidewall parts are less than 6mm. The total number shall not exceed 2 holes. The distance between two holes shall not be less than 100mm. Light truck tires are shown in Table 1 of Chapter -. For truck tires, see Table 2 of Chapter 1. 13.2 Technical requirements for repair and tire selection of pneumatic tires for agriculture, small and medium-sized engineering machinery, industrial vehicles, animal-drawn vehicles and their trailers. 13.2.1 The remaining tread depth at the tread crown pattern depth measurement point shall not be less than 1/4 of the tread depth of a new tire of the same specification. 13.2.2 Local delamination is allowed between the buffer layers and between the buffer layers and the ply. The length of a single void shall not exceed 40% of the nominal section width of the tire of the same specification, and the total length shall not exceed 1/8 week. 13.2.3 Slight aging cracks are allowed on the sidewall, and partial voids are allowed between the tire shoulder, sidewall rubber and ply, with the total length not exceeding 1/5 week.
13.2.4 Slight jumpers are allowed in the tires. The number of layers shall not exceed one, and the total length shall not exceed 1/5 of the circumference of the inner circle. 13.2.5 The bead wrapper is allowed to have mechanical damage or wear, but the steel wire must not be exposed. The bead is not allowed to deform. 13.2.6 Punctures are allowed in the carcass (including those that damage more than 50% of the carcass layers). The maximum size is shown in Table 2 of Chapter 1. 14 Technical requirements for repaired tire finished products
14.1 Finished tread rubber physical machinery The performance requirements are the same as Table 3 in Chapter 1. 14.2 Adhesion quality requirements for repaired tires: The repaired parts inside the carcass must be tightly bonded. Between the liner and the carcass, 2 small spots with a diameter of less than 10mm are allowed outside of 75mm around the hole. Empty. No voids, delaminations or sponges are allowed in any other parts of the tire that would affect the service life of the tire.
14.3 Appearance quality requirements for repaired tires: 14.3.1 No parts of the repaired tire that should be repaired are left out, and any parts that can affect the use of the tire are not allowed. All parts of the service life have been repaired and repaired. 14.3.2 The repaired area has clear patterns, and if the tire crown repair area exceeds one pattern, similar patterns must be carved, preferably the same pattern. If tread blocks are used for repair, the same pattern should be used.
14.3.3 The new glue in the heating zone of the repaired area is not allowed to have aging cracks, and there is no lack of sulfur or insufficient sulfur. 14.3.4 The bead diameter must remain the original tire diameter, and no deformation of the bead is allowed after repair. 14.3.5 The unevenness of the pad in the repaired area of ??the tire shall not be greater than 5mm. 15 Test methods
15.1 The hardness of the finished tread rubber of repaired tires is measured according to GB531. 15.2 The tensile strength, modulus stress and elongation at break of the finished tread rubber of the repaired tire shall be sampled according to the provisions of GB519 and measured according to GB528.
15.3 The wear of the finished tread rubber of repaired tires shall be sampled in accordance with the provisions of GB519, the density shall be measured in accordance with GB533, and the wear shall be measured in accordance with GB1689. 15.4 The adhesion strength between the components of the repaired tire product shall be sampled in accordance with the provisions of GB519 and measured in accordance with GB532. 15.5 The adhesion quality of the finished tire repair can be checked by tapping with a hand hammer. 15.6 The appearance quality of the repaired tires can be checked with a ruler and visual inspection. 16 Inspection Rules
16.1 The finished tire after repair shall be inspected by the quality inspection department of the production unit in accordance with this standard. 180
GB7037-92
16.2 The quality inspection of repaired tires shall be carried out in accordance with the relevant provisions of 15.1, 15.2, 15.3 and 15.4 of this standard. 16.3 The sampling requirements for the appearance quality inspection and outer edge size of repaired tires, and the physical and mechanical properties inspection of tread rubber shall be carried out in accordance with the provisions of 8.2 and 8.3 in the retread tire section of this standard. || tt | Additional notes:
This standard is proposed by the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the National Tire and Rim Standardization Technical Committee. This standard is drafted by the Guilin Rubber Industry Design Institute of the Ministry of Chemical Industry. The main drafters of this standard are Gao Xiaoheng and Lu Younan. 181
1 needs to be stamped with stamps; the rest should be stamped with inspection seals and Class A, B, and C seals after passing the inspection. The seal can be made with a material that cannot be washed away with water.
Part 2 Repaired Tires
10 Subject Content and Scope of Application
This standard specifies the technical requirements for tire selection, finished product quality technical requirements, test methods, inspection rules and markings for repaired tires . This standard applies to the repair of pneumatic tires for cars, trucks, agriculture, small and medium-sized engineering machinery, industrial vehicles, animal-drawn vehicles and their trailers with bias structures.
11 cited standards
GB519
Pneumatic tire physical and mechanical properties test method Pneumatic tire outer edge size determination method
GB5213
GB528
Determination of tensile properties of vulcanized rubber
GB531
Rubber Shore A hardness test method
GB532
GB533
GB1689
GB6326| | tt | |12.1 Hole size: refers to the length and width of the bottom of the hole after polishing. 12.2 The total length of the hole: refers to the total length of the hole that has been repaired in the past. 12.3 Spacing between two holes: refers to the minimum distance between the edges of two holes. 12.4 Nail holes: refers to hard holes with a diameter of less than 6 mm. 13 Technical requirements for repairing tire selection
13.1 Technical requirements for repairing and selecting pneumatic tires for cars and trucks. 13.1.1 The remaining tread depth at the crown tread depth measurement point shall not be less than 1/4 of the tread depth of new tires of the same specification. 13.1.2 The single hollow length of the carcass, for light truck tires, shall not exceed 30% of the nominal cross-sectional width of the tires of the same specification. %, truck tires shall not exceed 80%. The total free length: light truck tires shall not exceed 40% of the nominal section width of tires of the same specification, and truck tires shall not exceed 180%. Car tires are not allowed to have hollow carcasses. GB7037—92
13.1.3 Partial jumpers are allowed in truck tires. The number of layers shall not exceed one, and the total length shall not exceed 1/5 of the circumference of the inner circle. Local jumpers are not allowed on car tires.
13.1.4 Slight aging is allowed on the sidewall, but the ply must not be damaged. 13.1.5 Partial voids are allowed between the tire shoulder, sidewall rubber and ply, and the total length shall not exceed 1/5 week. 13.1.6 The chafer fabric is allowed to have mechanical damage or damage, but the steel wire must not be exposed. The bead is not allowed to deform. 13.1.7 The maximum size of holes allowed in the carcass (including those where the ply layer is damaged by more than 50% of the carcass layers): the crown part of the car tire is less than 5mm. The shoulder and sidewall parts are less than 6mm. The total number shall not exceed 2 holes. The distance between two holes shall not be less than 100mm. Light truck tires are shown in Table 1 of Chapter -. For truck tires, see Table 2 of Chapter 1. 13.2 Technical requirements for repair and tire selection of pneumatic tires for agriculture, small and medium-sized engineering machinery, industrial vehicles, animal-drawn vehicles and their trailers. 13.2.1 The remaining tread depth at the tread crown pattern depth measurement point shall not be less than 1/4 of the tread depth of a new tire of the same specification. 13.2.2 Local delamination is allowed between the buffer layers and between the buffer layers and the ply. The length of a single void shall not exceed 40% of the nominal section width of the tire of the same specification, and the total length shall not exceed 1/8 week. 13.2.3 Slight aging cracks are allowed on the sidewall, and partial voids are allowed between the tire shoulder, sidewall rubber and ply, with the total length not exceeding 1/5 week.
13.2.4 Slight jumpers are allowed in the tires. The number of layers shall not exceed one, and the total length shall not exceed 1/5 of the circumference of the inner circle. 13.2.5 The bead wrapper is allowed to have mechanical damage or wear, but the steel wire must not be exposed. The bead is not allowed to deform. 13.2.6 Punctures are allowed in the carcass (including those that damage more than 50% of the carcass layers). The maximum size is shown in Table 2 of Chapter 1. 14 Technical requirements for finished tire repairs
14.1 Physical machinery of finished tread rubber The performance requirements are the same as Table 3 in Chapter 1. 14.2 Adhesion quality requirements for repaired tires: The repaired parts inside the carcass must be tightly bonded. Between the liner and the carcass, 2 small spots with a diameter of less than 10mm are allowed outside of 75mm around the hole. Empty. No voids, delaminations or sponges are allowed in any other parts of the tire that would affect the service life of the tire.
14.3 Appearance quality requirements for repaired tires: 14.3.1 No parts of the repaired tire that should be repaired are left out, and any parts that can affect the use of the tire are not allowed. All parts of the service life have been repaired and repaired. 14.3.2 The repaired area has clear patterns, and if the tire crown repair area exceeds one pattern, similar patterns must be carved, preferably the same pattern. If tread blocks are used for repair, the same pattern should be used.
14.3.3 The new glue in the heating zone of the repaired area is not allowed to have aging cracks, and there is no lack of sulfur or insufficient sulfur. 14.3.4 The bead diameter must remain the original tire diameter, and no deformation of the bead is allowed after repair. 14.3.5 The unevenness of the pad in the repaired area of ??the tire shall not be greater than 5mm. 15 Test methods
15.1 The hardness of the finished tread rubber of repaired tires is measured according to GB531. 15.2 The tensile strength, elongation stress and elongation at break of the finished tire tread rubber of repaired tires shall be sampled according to the provisions of GB519 and measured according to GB528.
15.3 The wear of the finished tread rubber of repaired tires shall be sampled in accordance with the provisions of GB519, the density shall be measured in accordance with GB533, and the wear shall be measured in accordance with GB1689. 15.4 The adhesion strength between the components of the repaired tire product shall be sampled in accordance with the provisions of GB519 and measured in accordance with GB532. 15.5 The adhesion quality of the finished tire repair can be checked by tapping with a hand hammer. 15.6 The appearance quality of the repaired tires can be checked with a ruler and visual inspection. 16 Inspection Rules
16.1 The finished tire after repair shall be inspected by the quality inspection department of the production unit in accordance with this standard. 180
GB7037-92
16.2 The quality inspection of repaired tires shall be carried out in accordance with the relevant provisions of 15.1, 15.2, 15.3 and 15.4 of this standard. 16.3 The sampling requirements for the appearance quality inspection and outer edge size of repaired tires, and the physical and mechanical properties inspection of tread rubber shall be carried out in accordance with the provisions of 8.2 and 8.3 in the retread tire section of this standard.
17 mark
17.1 Inspection seal (including company name, whether it is a qualified product); 17.2 Repair the mark on the tire 17.1 The mark can be washed with water. Additional notes:
This standard is proposed by the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the National Tire and Rim Standardization Technical Committee. This standard is drafted by the Guilin Rubber Industry Design Institute of the Ministry of Chemical Industry. The main drafters of this standard are Gao Xiaoheng and Lu Younan. 181
2. Technical requirements for repair and tire selection of pneumatic tires for agriculture, small and medium-sized engineering machinery, industrial vehicles, animal-drawn vehicles and their trailers. 13.2.1 The remaining tread depth at the tread crown pattern depth measurement point shall not be less than 1/4 of the tread depth of a new tire of the same specification. 13.2.2 Local delamination is allowed between the buffer layers and between the buffer layers and the ply. The length of a single void shall not exceed 40% of the nominal section width of the tire of the same specification, and the total length shall not exceed 1/8 week. 13.2.3 Slight aging cracks are allowed on the sidewall, and partial voids are allowed between the tire shoulder, sidewall rubber and ply, with the total length not exceeding 1/5 week.
13.2.4 Slight jumpers are allowed in the tires. The number of layers shall not exceed one, and the total length shall not exceed 1/5 of the circumference of the inner circle. 13.2.5 The chafer fabric is allowed to have mechanical damage or wear, but the steel wire must not be exposed. The bead is not allowed to deform. 13.2.6 Punctures are allowed in the carcass (including those that damage more than 50% of the carcass layers). The maximum size is shown in Table 2 of Chapter 1. 14 Technical requirements for repaired tire finished products
14.1 Finished tread rubber physical machinery The performance requirements are the same as Table 3 in Chapter 1. 14.2 Adhesion quality requirements for repaired tires: The repaired parts inside the carcass must be tightly bonded. Between the liner and the carcass, 2 small spots with a diameter of less than 10mm are allowed outside of 75mm around the hole. Empty. No voids, delaminations or sponges are allowed in any other parts of the tire that would affect the service life of the tire.
14.3 Appearance quality requirements for repaired tires: 14.3.1 No parts of the repaired tire that should be repaired are left out, and any parts that can affect the use of the tire are not allowed. All parts of the service life have been repaired and repaired. 14.3.2 The repaired area has clear patterns, and if the tire crown repair area exceeds one pattern, similar patterns must be carved, preferably the same pattern. If tread blocks are used for repair, the same pattern should be used.
14.3.3 The new glue in the heating zone of the repaired area is not allowed to have aging cracks, and there is no lack of sulfur or insufficient sulfur. 14.3.4 The bead diameter must remain the original tire diameter, and no deformation of the bead is allowed after repair. 14.3.5 The unevenness of the pad in the repaired area of ??the tire shall not be greater than 5mm. 15 Test methods
15.1 The hardness of the finished tread rubber of repaired tires is measured according to GB531. 15.2 The tensile strength, modulus stress and elongation at break of the finished tread rubber of the repaired tire shall be sampled according to the provisions of GB519 and measured according to GB528.
15.3 The wear of the finished tread rubber of repaired tires shall be sampled in accordance with the provisions of GB519, the density shall be measured in accordance with GB533, and the wear shall be measured in accordance with GB1689. 15.4 The adhesion strength between the components of the repaired tire product shall be sampled in accordance with the provisions of GB519 and measured in accordance with GB532. 15.5 The adhesion quality
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