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Classification and comparison of test methods for down resistance of fabrics
Feather down is a natural material with irreplaceable advantages over other materials. Down products are favored by consumers for their light, soft and warm properties. However, the drilling down problem of down products has always plagued manufacturers and consumers, and it is also one of the hot spots of quality complaints of down products. Therefore, it is of great practical significance to study the test method of fabric anti-drilling down performance for improving the quality of down products and reducing the quality disputes caused by down and down drilling. 1 Feather and down drilling mechanism The anti-drilling performance refers to the performance of the fabric to prevent the feather and down from being drilled out of its surface, which is expressed by the number of down-drilling roots under the action of the specified conditions. Down fibers exist in the form of tufts. In each tuft, there are several fibers with basically the same internal structure. Each fiber will have a certain repulsion force and keep the distance to the maximum, so that the down is produced. fluffy. When the down quilt is filled into the product, the down close to the fabric is repulsed by the inner down and squeezed outward, producing an outward pushing force to make the down close to the fabric. Down has good resilience, no matter which direction is pressed, the fibers can quickly return to their original shape, while the air permeability of down-proof fabrics is usually poor, resulting in the stagnation of a large amount of still air in the down-filled inner cavity of down products. When the down product is squeezed or rubbed by the outside world, the still air leaks out from the pores of the fabric or the needle eye of the suture, and the down takes the opportunity to follow the air to drill out of the inner cavity, forming drill down[1]—2]. 2 Classification of anti-drilling down test methods Research on fabric anti-drilling down test methods has always been a bottleneck restricting the development of down products. In my country's down clothing product standards, there is no specific requirement for the anti-drilling down property index. Scientific and effective test methods and test equipment have a great impact on the research on down resistance properties of down products. According to the test principle and test equipment, the current test methods for the anti-drilling performance of fabrics at home and abroad can be divided into three categories [3]: transfer box method: according to GB/T 12705.2—2009 'Test methods for down resistance of textile fabrics - Part 2: Transfer box method', FTMS191A Method 5530—1978 Test method of test method for down resistance of fabrics by transfer box method. Friction method: according to GB /T 12705.1—2009 'Test methods for down resistance of textile fabrics - Part 1: Friction method', EN12132.1—1998 'Feather and down fabrics - Test methods for down resistance - Part 1: Friction test' test. Shock method: according to EN 12132.2—1998 'Test methods for down resistance of feather and down fabrics - Part 2: Impact test' test. 2.1 The transfer box method The transfer box method was originally derived from the standard FTMS 191A Method 5530 formulated by the US federal government in 1978.—1978 'Test method for anti-drilling down of fabrics - transfer box method', in 1991, my country also formulated GB/T 12705 with reference to the American standard—1991 'Test method for down resistance of fabrics', and updated in 2009 to GB/T 12705.2—2009 'Test methods for down resistance of textile fabrics - Part 2: Transfer box method'. The basic principle of the rotating box method is: the sample is made into a sample bag with a certain size, filled with a certain quality of down and feather filling material, placed in the rotating box of the test instrument equipped with hard rubber balls, and passed through the rotating box. It rotates at a constant speed, brings the rubber ball to a certain height, and impacts the sample in the box to simulate the various squeezing, rubbing, and collision effects of down products during consumption. The number of out down and feathers was used to evaluate the anti-drilling performance of the fabric. The rotating box method instrument is shown in Figure 1. There are some differences in the test technology between the two test methods of the transfer box method, and the similarities and differences are shown in Table 1. It can be seen from Table 1 that the two test methods are all using the revolving box method. The samples are randomly turned over in the revolving box and are impacted by rubber balls to simulate the random state of down products when they are worn. The differences lie in the size of the sample, the quantity and quality of the rubber balls, the speed of the rotary box, the control of the test time, and the evaluation of the test results. For the evaluation of test results, GB/T 12705.2—2009 'Textile fabrics - Test method for down resistance - Part 2: Rotation box method' adopts the statistical method of down down
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