1 Scope This standard specifies the method of using a pilling box to determine the degree of pilling of the fabric without pressure. Conform to the standard: GB/T 4802.3-1997 replaces GB 4802.3-84 This standard is applicable to most fabrics, and it is more suitable for needle woven fabrics. 2 Quoted standards The provisions contained in the following standards, through quotation in this standard, constitute the provisions of this standard. At the time of publication, the editions indicated were valid. All standards will be revised, and all parties using this standard should explore the possibility of using the latest
version of the following standards. GB6529-86 Standard atmosphere for humidity control and testing of textiles GB8170-87 Numerical rounding rules 3 Definition This standard adopts the following definitions. 3.1 Pilling Pilling After friction, the fabric protrudes from the surface of the fiber ends, entangled with each other to form a fluffy ball. 3.2 Pilling resistuce The ability of the fabric to resist pilling. 4 Principle According to the prescribed methods and parameters, the fabric sample is placed on a polyurethane plastic tube, and placed in a rotatable square wooden box lined with rubber cork to roll. Under the specified light conditions, compare the rolled sample with the standard sample to assess the pilling level. 5 Device 5.1 Pilling box: square wooden box, the inner wall is lined with 3.2mm thick rubber cork, and the unlined front inner wall is 235mm long on each side. The rotating speed of the box is 60r/min. 5.2 Polyurethane sample tube, weight 50g, length 140mm, diameter 30mm. 5.3114mm square punch, or use template, pen, scissors to cut sample. Approved by the State Bureau of Technical Supervision on 1997-06-09, 1997-12-01, implemented 5.4 sewing machine. 5.5 tape paper. 5.6 Standard sample photo: The standard sample photo is a five-level system. 5.7 rating box 6 regulator humidity and test atmosphere in accordance with the standard atmospheric humidity control, humidity control and test specified in GB 6529. The arbitration test adopts the secondary standard atmosphere. 7 Sample 7.1 The sample is humidified in the standard atmosphere for the test. 7.2 Randomly cut samples at the upper and lower parts of the fabric 10cm from the edge of the fabric. There should be no defects that affect the test results. 7.3 Cut four pieces of 114mm×114mm specimens, fold them in half on the test surface, and sew them into a specimen sleeve at a distance of 6mm from the side (see Figure 1). Among them are two longitudinal (warp) direction specimen sleeves and two transverse (latitude) direction specimen sleeves. 7.4 Turn the sewn sample cover upside down so that the fabric test side faces outward. 7.5 The sample is placed on the sample tube under uniform tension. The seam of the sample sleeve should be flat and affixed to the sample tube. 7.6 In order to fix the position of the sample on the sample-carrying tube and prevent the sample from loosening, wrap the side of the sample with tape (the length should not exceed one and a half circle of the sample-carrying tube circumference). 8 Test procedure 8.1 Before the test, the pilling box must be cleaned, and no short fibers or other substances that affect the test should be left. 8.2 Put the four carrier tubes with samples in the box, close the lid firmly, and pull the counter to the required number of rotations. 8.3 preset number of revolutions: coarse textiles turn 7200r, worsted fabrics 14400r or the number of revolutions as agreed 8.4 Start the pilling box, when the counter reaches the required number of revolutions, remove the sample from the sample tube and remove the stitches; unfold the sample, compare the standard sample photos in the rating, and evaluate the pilling procedure of each sample. Expressed as the nearest 1/2 level. 9 Result The average value (grade) of four samples is used to indicate the pilling grade of the sample. Calculate the average and round to two decimal places. If the decimal part is less than or equal to 0.25, move to the next level (if 2.25 is level 2); if it is greater than or equal to 0.75, move to the next level (such as 2.85 is level 3); if it is greater than 0.25 and less than 0.75, take 0.5 . 10 The test report states that the test was carried out in accordance with the standard and reports the following: a) the name, specification and batch number of the sample; b) test date; c) test conditions; d) instrument model e) pilling level f) any deviation The details of this standard and abnormal phenomena in the test need to be explained. Appendix A (standard appendix) A1 rubber cork lining after a period of use, the surface of the rubber cork may become smooth, or adhesion of grease, softener and finishing agents, these changes will lead to reduced pilling. When this happens, the rubber cork can be wiped with methanol to restore the original pilling performance; if it is still invalid after the wipe, the rubber cork lining must be replaced. Rubber cork surface friction test method (see Appendix B). After using a new pilling box or replacing it with a new lining, the friction performance of the rubber cork surface in the pilling box must be measured to determine the change in the surface friction coefficient after use, so as to grasp the service life of the rubber cork. When the coefficient of friction of the rubber cork drops below 1/2 of the original value, the rubber cork needs to be replaced. A2 Sample Carrying Tube It is necessary to check whether the new sample carrier tube has traces of the model during manufacture, and the convex surfaces at both ends should be smooth. A3 check The pilling performance of the instrument can only be checked directly with the fabric. Two or more of a certain number of fabrics of different grades (from 1 to 4) should be selected as reference fabrics. Periodically or when necessary, use the reference fabric as a test to compare the original sample to judge the difference and change of each pilling box or the same pilling.
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