Some standard content:
National Standard of the People's Republic of China
Cotton canvas for rubber industry
Cotton canvas for rubber industry1Subject content and scope of application
GB/T 2909
Replaces GB2909-82
This standard specifies the product varieties, specifications, technical requirements, scoring of fabric defects, test methods, marking, packaging, storage and transportation of cotton canvas for rubber industry.
This standard is applicable to the identification of the quality of cotton canvas for rubber industry produced by shuttle and shuttleless looms. 2 Reference standards
GB398 Technical requirements for natural cotton yarn
GB406 Annex Technical conditions for natural cotton cloth FZ/T10003 Test methods for canvas fabrics
ZBW04006.2 Correction method for the correction of the breaking strength of pure and blended cotton and chemical fiber products due to temperature and moisture regain
3 Product varieties and specifications
Formulated by the production department according to user needs. 4 Technical requirements
4.1 Technical requirements items
Breaking strength of natural cloth
The technical requirements for cotton canvas for rubber industry include six items: width, density, breaking strength, breaking elongation, square meter dry weight, and cloth surface defects.
4.2 Grading regulations
4.2.1 The quality grades of cotton canvas for rubber industry are divided into superior products, first-class products, and qualified products. Those below qualified products are unqualified products. 4.2.2 The cotton canvas for rubber industry shall be graded in pieces. The width, density and fabric defects shall be graded in pieces. The breaking strength, elongation at break and dry weight per square meter shall be graded in comments. The lowest grade among the six items shall be the grade of the piece. 4.2.3 The grading rules are as shown in Table 1.
Approved by the State Administration of Technical Supervision on May 5, 1994 and implemented on November 1, 1994
Below 100
100 and above
Density, root/10cm
Breaking strength, N
Elongation at break, %
Dry weight per square meter·g/cm2
Fabric surface defect score (average), points/m
Not more than
GB/T 2909--94
According to product specifications
According to product specifications
According to design regulations
According to design regulations
According to design regulations
Score limit
First-class products
Width, cm
100 and below
Above 100
First-class products
In accordance with regulations
In accordance with regulations
Allowable deviation
Qualified products
Above ±1.2%～±1.4%
Above ±1.0%～±1.2%
Above ±2.5%
Above ±3.5%
Above ±3.5～±4.5
Above ±3.0～±4.0
Above ±40
Above ±20
Conform to the specifications of first-class products
4.2.4 On the basis of meeting all the conditions of first-class products, the products that meet the following conditions are evaluated as superior products:a.
Strong heavy duty in warp direction
Light duty+8.0%
The average number of defects per meter on the fabric surface shall not exceed the following regulations: The allowable number of defects per meter: 0.05 for width of 100cm and below; 0.10 for width of more than 100cm
c. Elastic edges are not allowed.
5 Scoring of fabric defects
5.1 Inspection conditions for fabric defects
The inspection of fabric defects must comply with the following provisions: a. The illumination during inspection is 400 ± 1001x; b. The line speed of the fabric inspection machine is not more than 20m/min. 5.2 Scoring of fabric defects
Fabric defects shall be scored according to Table 2:
Conform to the provisions for qualified products
Defect categories
Obvious spots in the warp direction
Obvious defects in the weft direction
Obvious wood
Serious petal
5～~10 cm
5～10cm
Half width and below
5.3 Provisions for the number of allowed scores
GB/T 2909
Score
Above 10～
10 Above～
Above half width
30 Above～
30 Above～
Half width and below
5.3.1 The number of allowed scores for each piece of cloth is calculated as follows: 10
Above 50～
Above half width
Above half width
Total allowed score for each piece of cloth = number of allowed scores per meter (points/m) × length of piece (m)When the total allowed score for each piece of cloth has a decimal, it shall be rounded up to an integer. 5.3.2 The maximum cumulative score for 1m is 10 points. 5.4 Provisions for defect inspection
① The score of a single broken warp, loose warp, or tight warp of more than 50 cm shall be halved. Multiple loose warps and tight warps shall be scored in strips. ② The score of the staggered warp
stock and above shall be halved as if the stock is broken, and 1 point shall be given for stocks below 10m.
③ 2 or 3 knots in the shuttle are counted as one, and each large knot is scored 3 points.
5 points for rotten edges below 1~3cm, and 10 points for 3cm and above. 1 point for each knot or broken single yarn. 1 point for each knot. 1 point for concave edges 0.5~1cm deep. 10 points for more than 1cm.
③ 1 point for elastic edges 1m.
③ Deep oil stains and rust stains over 1 cm are scored; 1 point for scattered oil stains within 50 cm, shallow oil lines and oil stains are not scored.
③ Drag yarns under 2cm are not scored. Drag yarns over 3cm on the edge of the cloth are scored (two consecutive yarns are counted as one yarn)
① 1 point for double wefts over 10cm.
② 5 points for 3 or more 5cm long wefts in a shed mouth.
③ 5 or more rough edges within 10cm will be scored 1 point. ① Wrong weft: 28 tex weft yarn warp length 1 cm: 8 strands and above ±3 strands, 8 strands or less than 2 strands, 3 strands or less than 1 strand will be scored 1 point, and the original thread will be scored 5 points. ③ If there are 3 strands of debris (including weft loss less than 5cm), the coarseness of the weft yarn will be scored 3 points.
③ 6 weft shrinkage warp 50cm will be scored 1 point.
④ 1 point for more than half of the drive print, and the warp shrinkage wave pattern (4 flutes) will be scored according to the inconspicuous horizontal bar.
3 points for jump flowers less than 1cm
5.4.1 The scoring is based on the front of the cloth.
GB/T 2909
5.4.2 Defects within 1cm from the edge of the cloth. Broken warp (sunken yarn), wrong diameter, elastic warp 50cm will be scored 1 point, and other defects will still be scored according to regulations. 5.4.3 Regulations for distinguishing obvious or not obvious crossbars: 5.4.3.1 Crossbar defects are inspected at the most sparse or dense part. 5.4.3.2 The distinction between obvious and not obvious crossbar defects shall be in accordance with the provisions of Table 3. Table 3
Standard weft density, root
Weft density difference within 25cm, root
Crossbar defects
Not obvious
Above +3.0
Above -2.5
81~110
Above +3.5
—Above 3.0
Above 110
Above +4.0
—Above 3.5
5.4.4 When defects of different names and degrees are mixed together, they shall be scored separately and calculated together. However, defects on the same shed or the same yarn shall be scored according to the most serious one.
5.4.5 If there are defects on the fabric that are not included in the defect classification, they can be scored with reference to similar clauses. 5.5 Defect measurement
5.5.1 The length of the defect is measured by the maximum length in the warp or weft direction. 5.5.2 For defects and serious defects in the warp direction, if the length exceeds 1m, the excess part shall be scored again according to Table 2. 5.5.3 For defects scored by striping, the width is 0.5cm as one strip. For defects exceeding 0.5cm, each 0.5cm is one strip. For defects less than 0.5cm, it is counted as one strip.
5.6 Limitation on the number of partial defects
No defects with a score of 10 points are allowed in first-class products. 5.7 Defect repair requirements
5.7.1 Metal debris woven into the fabric must be removed in the weaving mill. 5.7.2 All defects that can be repaired in the weaving factory should be repaired before leaving the factory. 5.7.3 Canvas shall not be washed with water, otherwise it will be downgraded. 5.8 Regulations on false cutting shall be implemented for defects.
5.8.1 The false cutting of canvas shall be decided by negotiation between the supply and demand parties. 5.8.2 The six defects of 5 or more large holes, 5 or more holes, broken edges and flowers, unconnected shuttles, and rotten edges of more than 3cm must be cut off from the fabric.
6 Test method
FZ/T10003 shall be followed.
7 Inspection rules
7.1 The acceptance and re-inspection of cotton canvas for rubber industry shall be carried out in accordance with the provisions of this standard. 7.2 The public moisture regain of cotton canvas for rubber industry is 8%. 7.3 The manufacturer shall determine the grade according to the quality inspection results. At the time of delivery, the consignee shall promptly inspect and accept the goods. If not, the goods shall be accepted according to the inspection results of the consignor.
GB/T2909--94
7.4 When the acceptance department finds quality problems with the canvas, it shall promptly notify the manufacturer and retain the batch of products for joint re-inspection according to the standard.
7.5 Re-inspection quantity
7.5.1 The physical index shall not be less than 3 pieces.
7.5.2 The number of defects and length of the cloth surface shall not be less than 15% of the total quantity delivered. 7.6 Handling of re-inspection results
7.6.1 If the physical index does not meet the quality grade, the entire quantity of the batch of products shall be judged to be not meeting the quality grade. 7.6.2 If the rate of defects on the fabric surface not meeting the quality standard is within 4%, the price difference will be compensated according to the actual number of pieces found. If the rate of not meeting the quality standard exceeds 4%, the price difference will be compensated according to the actual downgrade percentage of the re-inspection converted to the total quantity. 7.6.3 If the length and quantity do not meet the standard, the excess will be refunded and the shortage will be supplemented. 7.7 The number of short-code fabrics shall not exceed 5% of the total number of deliveries, or the supply and demand parties shall negotiate and deal with it. 7.8 If quality problems are found in the processing of canvas in the rubber factory, the supply and demand parties shall negotiate and deal with it. 7.9 After the manufacturer delivers the product, if the quality of the product is affected or deteriorates due to poor transportation, storage and preservation, the consignee shall be responsible. If the reason is unclear, the supply and demand parties shall jointly analyze, find out the reason, and clarify the responsibility, and the responsible party shall be responsible. 8 Marking, packaging, storage and transportation
8.1 The markings should be obvious and clear for easy identification. 8.2 The packaging of canvas should ensure that the quality is not affected and it is suitable for transportation. For canvas sold in the near-term area, the packaging requirements can be determined by negotiation between the supply and demand parties.
8.3 The warehouse for storing canvas should be dry and ventilated, and attention should be paid to the first-in-first-out policy to avoid mildew and deterioration due to long storage time. 8.4 The first end of each piece of canvas should be stamped or labeled. The content of the label shall comply with the following provisions (see Table 4): Table 4
8.5 The canvas packaging should be painted with a mark (see Table 5). Factory
8.6 Each batch of canvas must be accompanied by a quality manual (see Table 6). 20
Warp and weft density
Warp and weft density
Production date or batch number
Total length
Production date and batch number
Avoid moisture
Breaking strength in warp and weft
Dry weight of 1m2
GB/T 2909—94
Warp and weft density
Breaking elongation in warp and weft
Moisture regain
Production date and batch number
A1Obvious defects in warp
GB/T 2909---94
Appendix A
Specific contents of various fabric defects
(Supplement)
Broken warp, wrong warp, loose warp, dragging yarn, big knot, concave edge, rotten edge, bald edge, loose edge, oil warp, oil stain, rust stain, poor finishing. A2
Obvious defects in weft
Double weft, missing weft, wrong weft, weft shrinkage, debris, oil weft, rust weft, rough edge, drive mark, warp shrinkage wave pattern. A3 horizontal bar
Sparse weft, dense weft.
A4 serious defects
Hole, edge gap, flower jump, rotten edge of 3cm or more, more than 15 shuttle knots in the whole 5cm of warp, poor finishing of damaged cloth base, mildew, metal debris woven in.
Appendix B
Description of fabric defects
(Supplement)
B1 Holes
3 or more warp and weft yarns are broken or one warp and weft yarn is broken, including 1 to 2 good yarns are separated. B2 Edges
3 or more warp and weft yarns are broken or one warp yarn is broken in the edge weave, including 1 to 2 good yarns are separated. B3 Jumps
3 or more warp and weft yarns are separated from each other, including a complete weave is separated. B4 Warp breaks
Warp yarns are broken on the surface of the fabric.
Wrong fibers, wrong yarns, multiple or fewer warps are woven into the fabric. B6
Elastic warp
Uneven tension when single yarns are added into strands, resulting in uneven elasticity of the warp yarns. B7
Uncut yarn ends are dragged on the fabric or the edge of the fabric. B8 Large knots (knots include front and back untied, tied knots, and no knots) Knots of warp threads above 28tex10 strands and above 58tex5 strands that are not tied separately. Raw edges
Weft yarns that are pulled or cut off at the edge are woven into the cloth (including intermittent unhooking of rapier looms and un-jet weft yarns). B10 Concave edges
The tension of the weft yarn is too large, and the edge of the cloth is 0.5cm deep. 22
B11 Rotten edges
GB/T 2909—94
Single broken weft yarn in the edge weave (referring to the weft yarn being cut continuously). B12 Bald edges
Canvas with steel wire weaves are continuously unhooked.
B13 Elastic edge
Refers to the edge of the cloth whose length differs from the length of the cloth body by 1.5cm or more per meter on average (5 to 8 points are measured on average for each piece of cloth. The cloth with an average of more than 1.5cm will be downgraded).
B14 Oil warp
Warp yarn stained with oil.
B15 Oil weft
Weft yarn stained with oil.
B16 Oil stain
The mark left after the fabric is stained with oil.
B17 Rusty warp
Warp yarn stained with rust.
B18 Rusty weft
Weft yarn stained with rust.
B19 Rust stain
The mark left after the fabric is stained with rust.
B20 Double weft
Two weft yarns are woven into the cloth in one shed.
B21 Weft loss
Three or more weft yarns are woven into the fabric in one shed. B22 Wrong weft
Wrong fibers, wrong yarns, multiple or fewer weft yarns are woven into the fabric. B23 Weft shrinkage
Weft yarns are woven into the fabric with twists.
B24 Multiple loose warps
Multiple warp yarns are woven into the fabric with relaxed tension.
B25 Warp shrinkage ripples
Part of the warp yarns are relaxed after being subjected to unexpected tension, causing the surface of the fabric to be uneven in blocks or strips. B26 Sparse weft
The weft density is less than the technical standard.
B27 Dense weft
The weft density is more than the technical standard.
B28 Shuttle knot
The knot that is butt-jointed after shuttle knitting.
B29 Poor finishing
The fabric surface is scraped and wrinkled.
B30 Weaving in of debris
Weaving in of debris such as clumps of waste silk, flying flowers, and wood. B31 Mildew spots
There are mildew spots on the fabric.
GB/T 2909--94
Appendix C
Temperature and moisture regain correction for normal temperature determination of fabric breaking strength (supplement)
Factory grading test, internal quality control test. The strength of the specimen can be corrected by rapid measurement under normal temperature and humidity conditions, and then converted using standard temperature and moisture regain, but the temperature and humidity at the test site must be kept stable. C1 Breaking strength correction formula
Corrected breaking strength (N) - measured breaking strength (N) × breaking strength correction coefficient Breaking strength correction coefficient
According to ZBW04006.2 execution.
2909—
(021)999 1
(96)086
(002)096 T
(61)098
(3610161
(06)088
(00)096
(ng/)s xa s/
(8/12)882
(8/12)88
(8/12)882
(8/12)88200||tt| |(8/1) 8×82
(8/2)882
(8/12)8×82
(01/02)01X62(01/02)01X62
( 1/12 )18
(9/01)9X89
(6/0)689
(8/01)880
(81/12)8182||tt| |(8/ 128182
(8/01)8×89
(6/01)6X85
201'021'01'g'1618
2021001g 1618
810168
1001g118
2811001g1618
2e1'021'001's16'18
101g1618
2810210011618
600 noon 06℃
200noon080
600260
(00t)086
(06)088
(06)088
(000 )086
(OD)SO
(38)08
(s/a ns s/
(9/12)982
(/1z)982
(9/)982
(8/)882
(8 /1)8×82
(/)82001|| tt||(/1)82900
(9/)988
(9/12)9×899
(9/)829
9 thousandoo1| |tt||(9/12)82001||tt ||(9/2)8200
(/2)82
(9/12)9×82
(9/)982
(9/2 )982
(8/)882
(8/ 12)8×82
(802)862
(/)
1001161
00151618
811001g1618
10191618
001618
1100g618
0005618
0102100s1618
281021001g1618
8101011618
281021001g1618
50k890
01006
S00009:0
900990
5000890| |tt||500 in 020
(09)980
(06)088www.bzxz.net
(06)088
(09)089
(02 )989
(06)0 88
(96)066
(02)989
(38)08
(99)989
(98)088||tt| |(06)088
(s/a oa g/N
(8/1)2
(/)282
(8/1)882
(8/1)882
(8/)82
(8/12)8×825pm001
( 8/1)88
(2/12)282
(8/882
(8/2)882
(8/2)882||tt ||（/车）
281'021'001'g'1618
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.