This standard specifies the method for determining the pilling performance of fabrics under slight pressure. Compliance with the standard: GB/T 4802. 1-19971 scope This standard applies to all kinds of textile fabrics. 2 Citation standards The provisions contained in the following standards constitute provisions of this standard through quotation in 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. Standard atmosphere for humidity control and testing of GB6529-86 textiles GB8170-87 Numerical Rounding Rule 3 Definitions This standard adopts the following definitions. 3.1 After pilling yarn or fabric is rubbed, the fiber end protrudes out of the surface to form fluff or small ball-like protrusions. 3.2 Pilling resistance The ability of textile fabrics to resist pilling. 4 Principle According to the specified method and test parameters, use nylon brush and abrasive or single-use abrasive to make the fabric friction and pilling. Then, under the specified light conditions, compare the pilling sample with the standard sample to assess the pilling level. 5 Device 5.1 Circular trajectory pilling instrument: The relative motion trajectory of the test chuck and the mass point of the grinding table is a circle, the relative motion speed is (60±1) r/min, the inner diameter of the sample clamping ring is (90±0.5) mm, and the clamping The head can apply the pressure listed in Table 1 to the sample, the chuck pressure is adjustable, and the pressure error is ±1%. The instrument is equipped with an auto-stop switch. 5.2 Abrasive: 5.2.1 Nylon brush: nylon wire diameter 0.3mm; the rigidity of the nylon wire must be uniform, the diameter of the planting wire is 4.5mm, each hole of the nylon wire is 150, the hole distance is 7mm; the brush surface is required to be flush, and the brush is equipped with adjustment The effective height of the nylon wire can be adjusted on the plate, and the fuzzing effect of the nylon brush can be controlled from a new look (see Appendix A). 5.2.2 Abrasive fabric: 2201 full wool Huada fabric, 19.6tex×2, twist Z 625-S 700, density: 445 pieces/10cm×244SVE /10cm, square meter weight: 305g/m2, 2/2 twill. 5.3 The foam gasket, weighs about 270g/m2, has a thickness of about 8mm, and the diameter of the sample gasket is about 105mm. 5.4 Sample cutting tool: The sample cutter can cut samples with a diameter of (113±0.5) mm. Templates, pens, and scissors can also be used to cut samples. 5.5 Standard sample photos: There are different standard sample photos for knitted fabrics and wool fabrics, and the sample photos are five-level system. Level 5 Slightly hairy no pilling Level 4 Slightly hairy pilling Level 3 Moderate pilling Level 2 Slightly severe pilling Level 1 Severe pilling 5.6 Grading box: Equipment that provides lighting to compare the pilling level of the sample and the sample. There are two 3.0 W fluorescent lamps on the top, and the inner circumference is lined with blackboards. The corners of the sample plate can be adjusted. The vertical distance between the fluorescent lamp and the sample plate is 30cm. 6 Standard atmosphere 6.1 Test and standard atmosphere, the general test is in accordance with the three-level standard in GB 6529, that is, temperature (20 ± 2 ℃) ℃, relative humidity (65 ± 5)%. During the arbitration test, follow the secondary standard in GB 6529, that is, temperature (20±2°C)°C and relative humidity (65±2)%. 6.2 The test tree must be humidified, cut and tested in the standard atmosphere for the test. 7 Sample 7.1 Expose the sample to the test standard atmosphere for more than 24h. 7.2 Randomly cut five samples at a position above 10 cm from the edge of the fabric. There should be no defects on the top and bottom of the sample that would affect the test results. 8 Procedure 8.1 Preparation before the test: 8.1.1 The instrument should be kept level before the test, and the nylon brush should be kept clean. If the instrument is used every day, clean it at least once a week. Clean the brush with a suitable solvent (such as acetone), remove the short lint with a hand brush, and use a clip to remove the protruding nylon filaments. 8.1.2 Mount the foam gasket, the sample and the abrasive on the test chuck and the grinding table respectively, and the sample must face outwards. 8.2 Adjust the pressure weight and friction speed of the sample chuck according to Table 1. Other fabrics can be tested by referring to the similar fabrics mentioned in the table or separately selecting test parameters and abrasive materials. Table 1 Sample Type Pressure cN Pilling Times Chemical Fiber Knitted Fabric 590150150 Chemical Fiber Woven Fabric 5905050 Military Uniform (Combed Blended) 4903050 Combed Wool Fabric 7800600 Coarse Wool Fabric 4900508.3 Remove the sample and place it in the rating box according to the test Compare the size, density, and shape of the pellets with the corresponding standard sample photos, and evaluate the abnormal pilling condition of each sample with the nearest 0.5 level, and comprehensively evaluate and explain the degree of its influence on the appearance. 9 Explanation of the results Calculate the arithmetic average of the five sample grades and round it to the neighboring grade 0.5 according to GB 8170. 10 The test report indicates that the test was carried out in accordance with this standard and reports the following: a) the name, specification and batch number of the sample; b) the test date; c) the test environmental conditions; d) the instrument model; e) the main technical parameters; f ) Pilling level; g) Any deviation from this standard and the abnormality of the test shall be noted. Appendix A (standard appendix) The calibration of the instrument, the adjustment of the reference fabric, the adjustment of the nylon brush and the replacement of the gasket and the abrasive fabric A1 calibration The pilling of the instrument can only be directly checked with the fabric. The check of the degree of linting of nylon brushes is made by reference fabrics by designated units in each industry. The user adjusts the nylon brush used according to the standard sample and reference fabric provided by the designated unit, and the fuzzing effect of the nylon brush meets the test requirements. A2 After starting the reference fabric instrument, select 3 to 4 fabrics with different pilling grades (from 1-2 to 4), and compare the pilling degree of the initial sample regularly or when necessary to judge nylon brush and abrasive fabric For changes in pilling performance, this fabric is the reference fabric and can be made at any time. Adjustment of A3 Nylon Brush A3.1 The uneven pilling of the test can be adjusted by adjusting the height of the adjustment plate of the corresponding part to correct it.
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