Inspection rules for cotton and chemical fiber pure and blended natural yarns

　1 Subject content and scope of application

This standard specifies the acceptance, inspection items, inspection methods and re-inspection requirements for cotton and chemical fiber pure and blended yarns.

This standard applies to the quality acceptance and re-inspection of cotton and chemical fiber pure and blended natural yarns by both the payee and the payer or by an entrusted inspection agency.

　2 Acceptance

2.1 The manufacturer shall issue product instructions based on the product inspection results. The recipient shall check the contents of the instructions and packaging marks according to the standards and protocols of the product for acceptance. .

2.2 If the consignee is unable to accept the goods upon receipt due to limited conditions, the goods should be received according to the manufacturer’s product instructions.

　3 Inspection items

The yarn inspection items include the provisions of the standard technical requirements of each product and the inspection of the net weight of the package. Users can inspect yarn defects and yarn defects during use. The formed appearance is inspected.

4 Inspection methods

4.1 Inspection of various indicators of technical requirements in product standards

4.1.1 Sampling in uniform and equal amounts, randomly As a principle, for one sample, take at least 3 packages of bobbins and skeins. The sampling quantity. When the batch size is 2t or less, sample according to the product standard. If the batch size is more than 2t, double the sample for one measurement.

4.1.2 The inspection methods for various indicators of technical requirements shall be inspected according to the test method standards specified in the product standards.

4.1.3 For yarns that have been heat-twisted and the twisting temperature is 40°C or above, the breaking strength of the single yarn shall be reduced by 5% according to the specified indicators for handover acceptance.

4.1.4 During the inspection of the net weight of packaged yarn, if the moisture regain rate is inconsistent between the electric oven and the package moisture meter, the moisture regain measured by the electric oven shall prevail.

4.1.5 When various types of yarn are not accepted according to the production batch, the weight variation coefficient per 100 meters should be increased by 0.4 according to the absolute value specified in the corresponding standard for evaluation products, etc.

4.1.6 The weight variation coefficient per 100 meters of singeing yarn should be increased by 0.4 according to the absolute value stipulated in the corresponding standard for evaluation products, etc. If it is not accepted according to the production batch, the weight variation coefficient per 100 meters The absolute value of the coefficient should be increased by 0.4 for the evaluated product, etc.

4.1.7 The weight deviation range of singeed yarn shall be increased by 0.5 for evaluation products according to the absolute value stipulated in the corresponding standards.

　

4.2 The inspection of the net weight of the package shall be based on the weight at the official moisture regain. When the actual moisture regain exceeds or is less than the official moisture regain, it shall be converted into the official moisture regain. For the actual weight at the rate, if the inspection quantity is less than 2t, take 2 packages (boxes), and if the inspection quantity is 2t and above, take 5% of the total number of packages (boxes), no more than 15 packages (boxes). Net weight of packaged yarn and permissible weight deviation for each batchWithin -0.2%, the net weight of the skein yarn package (after removing the influence of the Tex series difference on the weight) is allowed to be -0.5%. When the allowable deviation is exceeded, the entire difference should be compensated.

4.3 Before and during the use of the yarn, if defects affecting processing and finished product quality are found, and after investigation, it is confirmed that they are caused by the manufacturer, the skeins will be in large skeins and the cones will be in individual sizes. As a starting point, it can be exchanged or discounted by the original manufacturer.

4.4 For inspection of yarn defects, please refer to Appendix A (Supplement).

Yarn defects. If yarn fatigue causes a large number of downstream products to be downgraded, the spinning mill should bear responsibility.

4.5 When special quality problems that cannot be found on the yarn or gray fabric (such as the mixing of wrong fibers, yellow and white yarn, etc.) cause a large number of downgrading of printed and dyed finished products, after joint analysis, it is indeed caused by the spinning mill. The spinning mill should be responsible for the price difference loss caused by downgrading the printing and dyeing finished products, or the two parties should negotiate to deal with it.

　5 Re-inspection

5.1 If there is any objection to the yarn during handover and acceptance, both parties can jointly conduct re-inspection, or entrust a professional inspection agency to conduct arbitration inspection. Both re-inspection and arbitration inspection One time shall prevail.

5.2 The products required for re-inspection should be of the same delivery batch, the same variety, and the same grade, and are limited to whole packages of products that have not been processed or used within one year after leaving the factory.

5.3 When re-inspection is required, the entire required re-inspection quantity should be retained. However, in order not to affect the production of the processing enterprise, at least 20% of the required re-inspection quantity should be retained for re-inspection of quality indicators. The hank must not be Less than 3 whole packages (medium or large packages), cheese yarn shall not be less than 6 boxes (packages). However, when the net weight of the package is required to be re-inspected, the entire quantity required for re-inspection should be retained.

5.4 After receiving the notice of request for re-inspection, the manufacturer should immediately handle the matter and the time should not exceed two weeks. Otherwise, the manufacturer should acknowledge the other party’s opinions.

5.5 All costs incurred for re-inspection shall be borne by the responsible party.

5.6 If the quality of the product is affected or changes due to poor transportation or storage by the recipient or lender, no request for re-inspection or compensation shall be made.

Appendix A

Interim Provisions on Yarn Defect Acceptance

(Supplement)

A1 yarn defects should be detected before the yarn leaves the factory Inspection and grading are carried out beforehand. However, because the yarn defect inspection method is not yet mature, yarn defects are currently inspected from downstream products.

A2 The yarn defect inspection and treatment methods for natural fabrics are as follows:

A2.1 Temporarily inspect the coarse warp, coarse weft, slub yarn and evenness on the natural fabrics Unevenness and four key yarn defects.

A2.2 The outside of the natural color clothThe defects are inspected according to GB/T406 “Cotton Natural Color Fabric”. Any defects in coarse warp, coarse weft, slub yarn and uneven evenness are downgraded, that is, the fabric is downgraded with yarn defects. Record statistics after fabric inspection and before weaving.

A2.3 When the total number of pieces of coarse warp, coarse weft, slub yarn and uneven disposable lower-grade cloth accounts for more than 2% of the total monthly inspection volume of the same variety, yarn production The factory should bear the price difference loss of downgraded fabrics due to yarn defects.

A2.4 Weaving factories should carefully record and collect statistics on yarn defects and downgraded fabrics. If a small amount of daily yarn defects are downgraded, the spinning mill should be notified on schedule. If sudden yarn defects are downgraded, the spinning mill should be notified in a timely manner and the yarn should be retained for joint analysis.

A2.5 For yarns that have been downgraded to second class, the spinning mill is no longer responsible for the downgrade caused by yarn defects.

A3 Yarn defect inspection and treatment methods for knitting yarn are as follows:

A3.1 Yarn defects in knitting yarn include large impurities, large neps, slub yarn, Spun yarn, roving, big knots, flying flowers attached, etc.

A3.2 Yarn defect inspection of knitting yarn is carried out on the cloth surface of knitted gray fabric, and the number of yarn defects on the cloth surface of a certain weight is counted. The number of inspections and processing methods shall be determined through consultation between the spinning mill and the knitting manufacturer.

Additional notes:

This standard is under the jurisdiction of Shanghai Textile Standards and Measurement Institute.

This standard is drafted by Shanghai Textile Bureau, Beijing Textile Industry Corporation, and Hebei Textile Industry Corporation.