Analysis on the test method of down jacket's anti-drilling property

The test method of down jacket anti-drilling property is an important subject that needs to be solved urgently to study the problem of down jacket anti-drilling. At first, people tested the down jacket's down resistance by trying on, making cushions, etc., but the test cycle was long, the test strength was not fixed, and the results were difficult to measure. The anti-velvet performance of reactive fabrics, but this method is not intuitive and can only be used for fabrics with the same weave structure. The national standard of the People's Republic of China (GB/T 12705-91) specifies the test method for the down resistance of fabrics. Japan and the United States also have test methods and standards in this regard, but the research on the down jacket resistance in foreign countries is also relatively limited. This paper will analyze and compare the test methods currently used at home and abroad, study the possible deficiencies of the existing methods, and propose a new idea for the research on the drill down resistance test method. 1. Test method for down resistance of fabrics (GB/T 12705-91) Description 1.1 Test principle The sample is made into a bag, filled with a certain quality of down, and placed in a test machine rotary box equipped with hard rubber balls. The constant speed rotation of the box brings the rubber ball to a certain height and impacts the sample in the box to simulate various extrusion, rubbing, collision and other effects of down products during consumption. The number of down feathers produced was used to evaluate the anti-drilling performance of the fabric. 1.2 Main Equipment and Appliances 1.2.1 Testing Machine The testing machine consists of a rotary box that can rotate in forward and reverse directions, and electrical control parts. The rotary box is a cube with a smooth inner wall made of plexiglass, and its internal dimensions are: 450 mm×450mm×450 mm, and the rotating speed of the rotary box is 45 ± 1 r/min. The testing machine has functions such as preset number of revolutions and automatic stop at full number (as shown in Figure 1). 1.2.2 There shall be at least 12 homogeneous nitrile nitrile rubber balls with a hardness of 45±10 Shore and a weight of 140±5g for rubber balls. 1.3 Test procedure Place 10 rubber balls and a sample bag in the revolving box. The test is carried out by preset forward and reverse rotations 1000 times each, and the number of drill down roots is counted after each full count stops automatically. Adding the number of down roots counted twice is the test result of one sample bag. Each experiment was carried out three times, and the experimental results were averaged. 2. Comparison of domestic and foreign test methods Through the collection of relevant data, it is found that foreign research on the anti-drilling down performance of down is also relatively limited. At present, the United States and Japan mainly have relevant standards in this regard, but the research in Japan is not deep enough, only in the experimental method. The revolving box method was adopted, and only two conditions, the fixed drop point of the rubber ball and the fixed sample bag, were specified in the experimental description, and the other conditions were not mentioned. Therefore, the similarities and differences of the experimental methods between China and the United States are now compared (see Table 1). From Table 1, it can be seen that both China and the United States adopted the rotary box method in the selection of experimental methods, and adopted the comparison method in the control of the experimental process. Japan's more scientific and effective method is to replace the fixed sample bag and turn it over randomly, effectively simulating the random state of the down jacket when it is worn. The main difference lies in the selection and quantity of impact objects, the control of experimental time, and the evaluation of experimental results. The two indicators are qualified. In contrast, China is more scientific in experimental evaluation. In this paper, it is found that there are some deficiencies in the rotary box experimental method currently used at home and abroad, and the analysis is as follows:3. Analysis of the experimental equipment Before analyzing the experimental equipment, it is necessary to deeply understand the mechanism of down drilling down and down drilling down to study the fluffy properties of down. Bulkiness is an index to measure the elasticity of down, which refers to the ability of down to rise naturally after being under pressure. Down mainly exists in the form of down tufts. In each down tuft, there are dozens or even hundreds of fibers with basically the same internal structure, and each fiber will have a certain repulsion force and keep the distance to the maximum. This gives the down feather fluffy. The fluffy properties of down cause the duvet close to the fabric to be squeezed outwards, creating an outward pushing force that keeps the down close to the fabric. Usually the down fabric is anti-drilling down, and the air permeability of the fabric becomes relatively poor (through a series of processes such as weaving and finishing). When the outside is squeezed, the still air will leak out from the pores of the fabric or the needle holes left by the sewing, and the down close to the fabric will follow the air and drill out of the inner cavity. 3.1 Analysis of the rotary box In the test principle of 1.1, the sample is placed in the rotary box of the testing machine with hard rubber balls. Statistics, but it is not conducive to the flow and exchange of air. When the rubber ball hits and squeezes the down sample in the box, the fluffy performance of the sample is difficult to exert due to the lack of sufficient air, and the sample is in a short period of time. It is difficult to restore the original state, which will affect the test effect of down drilling down.
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