Cotton and chemical fiber pure blended natural yarn inspection rules composite fabric information

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 natural 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 issues product instructions based on the product inspection results. The consignee should 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 the yarn defects and yarn forming appearance during use. 4 Inspection methods 4.1 Inspection of various indicators of technical requirements in product standards 4.1.1 Sampling is based on the principle of uniformity and randomness. For one sample, at least 3 packages of bobbins and skeins are taken, and the sampling quantity and batch size are When the weight is 2t or less, the sample shall be taken according to the product standard. When the weight is more than 2t, the sample shall be doubled for 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 index for handover acceptance. 4.1.4 During the inspection of the net weight of the package 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 stipulated in the corresponding standards for evaluated products, etc. 4.1.6 The coefficient of variation of the weight of singeing yarn per 100 meters 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 absolute value of the coefficient of variation of the weight per 100 meters should be increased by 0. .4 Evaluation products, etc. 4.1.7 The weight deviation range of singeing yarn shall be increased by 0.5 to the absolute value stipulated in the corresponding standards for the evaluation products, etc. 4.2 The inspection of the net weight of the package shall be based on the weight at the official moisture regain rate. When the actual moisture regain exceeds or is less than the official moisture regain rate, it shall be converted into the actual weight at the official moisture regain rate. The inspection quantity shall be less than 2t. 2 packages (boxes), 2t and above, 5% of the total number of packages (boxes), no more than 15 packages (boxes). The permissible deviation of the net weight of packaged yarn in each batch is within -0.2%, and the permissible deviation of the net weight of skein yarn in packages (after excluding the impact of the difference in the Tex series on the weight) is -0.5%, exceeding the allowable In case of deviation, all differences 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, then the starting point for the large skein of the skein and the number of the cheese can be determined by the original manufacturer. The factory will provide replacement or discount compensation. 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 amount of downgrading of printed and dyed finished products, after joint analysis, it is confirmed that the spinning mill is responsible for the problem. , be responsible for the price difference loss caused by downgrading the printing and dyeing finished products, or negotiate between the two parties. 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 shall prevail. 5.2 The products requiring 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, and the skeins should not be less than 3 whole packages ( Medium package or large package), 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 changed 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) Yarn defects in A1 yarns should be inspected and combined with grading before the yarn leaves the factory. However, because the yarn defect inspection method is not yet mature, yarn defects are currently inspected from downstream products. The inspection and treatment methods for yarn defects in A2 natural-color fabrics are as follows: A2.1 Temporarily inspect the four key yarn defects of coarse warp, coarse weft, slub yarn and uneven evenness on natural-color fabrics. A2.2 The appearance defects of natural fabrics are inspected according to GB/T406 “Cotton Natural Fabrics”. Any defects such as 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 disposable downgraded fabrics with coarse warp, thick weft, slub yarn and uneven evenness accounts for more than 2% of the total monthly inspection volume of the same variety, the yarn manufacturer shall bear the responsibility for downgrading the yarn defects. The loss in price difference due to downgrading of cloth. A2.4 Weaving factories should conscientiously do a good job in downgrading fabrics with yarn defects.Record statistical work. If a small amount of daily yarn defects are downgraded, the spinning mill should be notified on a regular basis. If a sudden yarn defect is downgraded, the spinning mill should be notified in time and the yarn should be retained for joint analysis. A2.5 For yarn that has been downgraded to second class, the spinning mill is no longer responsible for the downgrade caused by yarn defects. The inspection and treatment methods for yarn defects in A3 knitting yarns are as follows: A3.1 Yarn defects in knitting yarns include large impurities, large neps, slub yarns, thin yarns, rovings, large knots, flying flowers, etc. A3.2 Yarn defect inspection of knitting yarn is carried out on the 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 Note: This standard is under the jurisdiction of Shanghai Textile Standards and Metrology Institute. This standard is drafted by Shanghai Textile Bureau, Beijing Textile Industry Corporation, and Hebei Textile Industry Corporation.
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