This standard specifies the types, requirements, sampling and inspection rules, test methods, product marking, packaging, transportation and storage of rubber materials for motorcycle tire inner tubes. Part 2 of this standard applies to motorcycle tire inner tubes. GB 7036.2-1997 Pneumatic tire inner tubes Part 2: Motorcycle tire inner tubes GB7036.2-1997 Standard download and decompression password: www.bzxz.net

GB7036.2---1997
Foreword
When revising this standard, taking into account the particularity of motorcycle tire inner tubes, the motorcycle tire inner tubes and automobile tire inner tubes in the previous version of the standard were separated. That is, GB7036 consists of two parts: the first part is automobile tire inner tubes, and the second part is motorcycle tire inner tubes. Part 2 of this standard is equivalent to the Japanese Industrial Standard JISK6367-1987 "Two-wheel motorcycle tire inner tubes". In order to adapt to my country's national conditions, sampling and inspection rules, product marking, packaging, transportation and storage requirements have been added. Based on my country's national conditions, the joint strength and thermal tensile deformation rate of inner tubes with small wheel diameters of 3.00 and below are appropriately adjusted, and the bonding strength item control of the rubber seat, valve rubber seat and tire body is added. The main difference between this standard and the previous version of the standard is that the specific specifications and dimensions of inner tube products have been deleted and compiled into Appendix C (the appendix of the reminder); the test items and index values ????of tire body strength and brittleness temperature have been excepted; the aging of natural rubber inner tubes has been added Requirements for tensile strength reduction rate. Test items are equivalent to Japanese standards.
This standard will also replace the motorcycle tire inner tube part of GB7036-89 from the date of effectiveness. Appendix A of this standard is the appendix of the standard, and Appendix B is the appendix of the standard. 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 was drafted by: Shanghai Zhongnan Rubber Factory, Wubo Rubber Group Company, Guangzhou No. 1 Rubber Factory, and Guangzhou Planet Tire Factory. The main drafters of this standard: Xia Qiyuan, Pan Fuze, Wang Xiaoju, and Mo Ruokang. This standard was first published in November 1986 and revised for the first time in March 1989. This standard is entrusted to the National Tire and Wheel Standardization Technical Committee to be responsible for interpretation. 166
1 Scope
National Standard of the People's Republic of China
Pneumatic tire inner tube
Part 2: Motorcycle tire inner tube
Inner tube of pneumatic tyres- Part 2: Inner tube of motorcycle tires—1997
GB 7036. 2
replaces GB7036-89
This standard specifies the types, requirements, sampling and testing of rubber materials for motorcycle tire inner tubes Inspection rules, test methods, product marking, packaging, transportation and storage.
Part 2 of this standard applies to motorcycle tire inner tubes. 2 Reference standards
The provisions contained in the following standards constitute provisions of this standard through citation in this standard. When this standard is released, the versions shown are valid. All standards are subject to revision and parties using this standard should explore the possibility of using the latest version of the standard listed below. GB518-91 Mito vehicle tires
GB/T519--93 Test methods for physical and mechanical properties of pneumatic tires Determination of tensile properties of vulcanized rubber and thermoplastic rubber GB/T 528--92
GB 1796-- 1996
Tire valve
Batch-by-batch inspection and counting sampling procedures and sampling tables (applicable to inspections of consecutive batches) GB 2828-87
Periodic inspection and counting sampling procedures and sampling tables (applicable to Inspection of the stability of the production process) GB 2829--87
GB 12835--91
3 types of rubber materials
plastic seat valve
according to the materials used Divided into two categories:
Natural rubber and natural rubber combined rubber inner tubes, referred to as Category A. Butyl rubber and butyl rubber combined rubber inner tubes are referred to as Category B. 4 Requirements
4.1 Specifications and dimensions
The specifications of the inner tube are indicated by the specification marks of the corresponding tires in GB518. The inner tube size is the size applicable to the outer tire specifications stipulated in the agreement between the supplier and the buyer. 4.2 Valve
The performance, size and requirements of the valve should comply with the regulations of GB12835. If other types of valves are needed, they must be negotiated between the supplier and the buyer.
4.3 Air tightness
shall comply with the requirements of Article 6.1.
State Bureau of Technical Supervision approved on 1997-09-10 and implemented on 1998-02-01www.bzxz.net
167
4.4 Appearance
GB7036.21997
Appearance quality requirements See Appendix A (standard appendix). 4.5 Performance
shall be tested according to the test method in Chapter 6, and its performance shall comply with the provisions of Table 1. Table 1 Performance and indicators
refers to
serial number
1
3
4
5
test item|| tt||Tear length at break, %
Joint tensile strength, MPa
Hot tensile deformation rate,
Plastic seat valve rubber seat
and tire Body adhesion test
%
Strength, kN/m
Strength.N
Tensile strength decrease rate after aging, %
A|| tt||Section 3.00
Above
8.3
25
3.5
Class
Standard
Section 3.00 and its
Below or small wheel diameter
500
6.5
28
150
10
Note: Rubber seat valve The bonding strength or strength between the rubber seat and the tire body is only applicable to the rubber seat valve with a base. 5 Sampling and inspection rules
See Appendix B (the standard appendix) for the sampling and inspection rules. 6 Test methods
6.1 Air tightness
Required
Seeking
B
Section 3.00
Above
3.5| |tt||Class
Section 3.00 and below
or small wheel diameter
450
3.4
35
150|| tt||Inflate the inner tube to 120% of the cross-sectional diameter of the original design model. After leaving it at room temperature for 12 hours, there should be no obvious air leakage in the qualified product. If there is obvious leakage, it should be re-inflated according to the same conditions as above and immersed in water for 1 minute. If more than one bubble emerges, it is deemed unqualified. However, the valve part is allowed to be tested again according to the above method after repair. 6.2 Tensile test
The tensile test is conducted according to GB/T528. Using a Type 1 cutter, when measuring tensile strength and elongation, take 4 samples longitudinally at non-joint locations (as shown in Figure 1). When measuring the elongation, measure the tensile strength at the same time as the tensile strength before the aging test. Amount of valve wax position
Joint strong seat
Test
wall shame
Group position
Joint
168||tt| |Figure 1
Selection of test piece
Tensile
Stretch
Property
Test
Test
Most|| tt | Use a type 1 cutter to take three samples from the center of the joint of the inner tube (as shown in Figure 1). The test method is the same as the requirements in 6.2, and the test results are calculated according to formula (1). TB=S2
where:
TB——-joint tensile strength, MPa;
StS2, S3—measured values ??of test piece (St>S,>S3), MPa. 6.4 Hot tensile deformation rate
(1)
Samples: 2 samples of each type A and B are uniformly and longitudinally sampled from non-joints on an inner tube. Mark the test piece with 25mm intervals and stretch it to 37.5mm; clamp it with a holder, place it in an aging box at 105C soil 2C, age it for 5h, cool it at room temperature for 2h, and then remove the tension to make it shrink. Leave it for no less than 8 hours. At this time, measure the distance between the two marking lines, and calculate the average thermal tensile deformation rate of the two samples according to formula (2).
PS
In the formula: IS---Hot tensile deformation rate, %; L--The distance between the marking lines before the test;
LThe distance between the marking lines after the test.
L, - La
Lo
6.5 Rubber seat The adhesive strength or bonding strength of the valve rubber seat and the tire body 6.5.1 Rubber seat The valve rubber seat and the tire body are bonded The composite strength is tested according to the provisions of 7.2.2 in GB/T519. 6.5.2. Rubber seat. The bonding strength between the valve rubber seat and the tire body is Use the upper clamp of the tensile testing machine to clamp the valve body of the sample, and the lower clamp to clamp the long end of the tire body of the sample. Conduct the bonding strength test at a descending speed of (500 ± 25) mm/min. If the valve body appears If the tire is pulled apart from the rubber seat or the carcass is torn, or if more than 50% of the tire body rubber is bonded to the base of the rubber seat, it is qualified.
Test conditions for the tensile strength decrease rate of 6.6A products after aging: Aging temperature: 90℃±1℃ Aging time: 24h
The test results are calculated according to formula (3).
X-Xi
A(TB)=
X
where: A(TB)
The decrease rate of tensile strength before aging, %; the median tensile strength before aging, MPa;
X, the median tensile strength after aging, MPa.
The result obtained by using (Ss + S.)/2 is the median value of SiSsS.S,.
Product marking, packaging, transportation and storage
7
7.1 Each inner tube should have the following markings:
Specification;
a)||tt ||b)
e)
d)
e)
Trademark and factory name or place name;
Manufacturing date or code:||tt ||Inspection marks:
Except for category A, each inner tube should have a 2mm wide color code line on its circumference; 169
Butyl rubber inner tubes have a blue code line.
The halogenated butyl rubber inner tube has green markings.
EPDM butyl inner tube has a red marking line. Heat-resistant and rubber inner tubes are labeled "heat-resistant". GB 7036.2—1997
The text of the above signs should not be less than 3mm×3mm, and there should be Chinese signs. 7.2 Packaging
7.2.1 For the inner tube matched with the outer tire, the inner tube should be installed into the outer tire and filled with appropriate gas so that it is in contact with the inner edge of the outer tire, and then tied with ropes in two or more places.
7.2.2 Inner tubes that are not matched with outer tires should have inner and outer packaging. The packaging can be agreed upon by both parties, but the outer packaging should have product markings and be tied firmly to prevent loosening.
The mark includes:
a) name, place of origin and trademark;
b) product name, specifications;
quantity, weight and volume;
c )
d) Production date.
7.3 Transportation
7.3.1 When transporting inner tubes, they should be protected from the sun and rain and should be covered. 7.3.2 It is prohibited to transport inner tubes together with oil, flammable and chemically corrosive items. 7.3.3 The inner tube should be protected from mechanical damage during transportation. 7.4 Storage
7.4.1 It is forbidden to store inner tubes in the open air and avoid sunlight. The room temperature in the warehouse is between 15 and 35°C, and the relative mixing degree is not more than 80%. 7.4.2 It is prohibited to store inner tubes together with oil, flammable, chemically corrosive and other items, and they must be kept away from heat sources. 7.4.3 Inner tubes should be stored on a pad 200mm above the ground and should not be against the wall. 7.4.4 Inner tubes should be shipped in order of purchase date. Provided that storage conditions are observed, the storage period shall not exceed one year from the date of shipment. 8Others
If there are special requirements, they can be resolved through negotiation between the supply and demand parties in accordance with the main principles of this standard. 170
No.
1
2
3
4
5
6
7| | tt | | 9 | | |tt | Local uneven thickness
GB 7036.2-1997
Appendix A
(standard appendix)
Table A1
Motorcycle tire inner tube appearance quality| |tt||refers to
none
none
none
none
length ≤10mm
cumulative length ≤1/3 circumference (mm)
Cumulative length ≤ 1/4 circumference (mm)
Standard
Effective thickness ≥ 80% standard thickness (mm)
Depth ≤ 0.2mm, Length ≤10mm
Double-layer thickness deviation of corresponding part ≤0.5mm
Appendix B
(standard appendix)
Sampling and inspection rules
Unqualified Product Category
A
A
B
B
B
C
C
C
C
C
B1 inner tube products are inspected by the inspection department of the manufacturer. Factory products should comply with the provisions of this standard and be accompanied by a product quality certificate. Users have the right to conduct acceptance inspection of inner tubes.
B2 Inspection Category
B2.1 The inspection of inner tube products is divided into two categories: factory inspection (delivery inspection) and type inspection (routine inspection). B2.2 The factory inspection item is appearance quality inspection, and the type inspection item is product performance inspection. B2.3 If the following conditions occur, periodic inspection of type inspection must be carried out;
a)
b)
c
d)
e)
f)
Production finalization inspection;
Mass production inspection;
Resumption of production inspection;
When there are major changes in processes and raw materials Inspection; inspection by the national quality supervision agency.
The inspection procedures and inspection implementation of B3 product factory inspection shall be carried out in accordance with the provisions of Chapter 3 and Chapter 4 of GB2828. B3.1 The classification of unqualified appearance quality is shown in Appendix A (Appendix of the Standard). B3.2
Adopt a normal inspection one-time sampling plan, and generally check the horizontal ears. Qualification quality level (AQL): Class A failure is 1.0; Class B failure is 2.5; Class C failure is 4.0. B3.3
B3.4 In principle, each delivery batch is regarded as one inspection batch. The inspection procedures and inspection implementation of B4 product type inspection shall be carried out in accordance with the provisions of Chapter 3 and Chapter 4 of GB2829. B4.1 Inspection cycle and corresponding inspection items
a) The appearance quality of products subject to periodic inspection must be qualified; air tightness inspection, for each representative specification product, the inspection cycle is 1 month, b)| |tt||171
GB 7036.2-1997
c) For the items in Table 1, for each representative specification product, the inspection cycle is 3 months. B4.2 Adopt a sub-sampling inspection plan with a judgment level of 1. B4.3 Unqualified quality level (RQL value) is 40. B5 Disposal after inspection
Disposal after factory inspection (delivery inspection) shall be carried out in accordance with the relevant provisions of Article 4.12 in GB2828. Disposal after type inspection shall be carried out in accordance with the relevant provisions of Article 4.12 of GB2829.
B6 Transfer Rules
The transfer rules shall be implemented in accordance with the relevant provisions of Article 4.6.3 of GB2828. Attachment C
(Appendix to the prompt)
Table C1
Motorcycle tire inner tube
Main size
inch, mm
Inner tube Specifications
3.00—10
3.50—10
3.00--12
2.50—14
2.75-14
3.00-- -16
2-16
3.25—16
2.00—-17
2.25—17
2.50-17
2.75-17 |tt||70
80
55
80
50
55
60
70||tt ||平纳外周长
不英语
1130
1150
1250
1200
1300
1500| |tt||1320
1500
1370
1410
1450
1500
基金电影
重画+ g
不英语
350
410
400
270
330
460
250
470
205
310
330
380
气门嘴美国
Z1-11-1|| tt||21-10-1
Z1-11-2
Z1-10-2
Z1-10-3
Z1-10-1/Z1 -11-1
Z1-11-1
Z1-11-1/Z1-10-1
Z1-11-2
Z1-10-2 4 00—17||h||2.50—18||h||2.75—18||h||3.00—18||h||3.25-18||h||3.50—18||h||4.00— 18
4.50--18
5.10—18
2.00—19
3.25---19
3.50-·-19||tt| |3.75-19
4.00-19
3.00—21
GB 7036.2—1997
表C1(完）
主要 尺 寸,mm
平右天要进口
不英语
80
110
60
70
80||tt| |95
124
126
50
95
124
80
平巳外周长||tt ||不是
1560
1750
1510
1560
1650
1700
1900||tt| 1845 tt 1550 1840 1978 1900 ||480
610
350
380
490
505
665
750
220
525
67
510
气门嘴美国
Z1-10-3
Z1-11-1||tt ||Z1-11-2
Z1-10-2
21-11-4
Z1-11-1/Z1-10-1
Z1- 11-4
173
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