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Analysis on the Test Method of Down Jacket's Anti-drilling Down Property

by:GESTER Instruments     2021-04-04
The test method of down jacket anti-drilling property is an important topic that needs to be solved urgently when studying the problem of down jacket anti-drilling. At first, people used methods such as trying on and making cushions to test the down jacket's anti-pile performance, but the test cycle was long, the test intensity was not fixed, and the results were difficult to measure. Later, the fabric breathability test method was used, because the air permeability is small and can be to a certain extent. It reflects the anti-fleece performance of the fabric, but this method is not intuitive enough and can only be used for fabrics with the same structure. The National Standard of the People's Republic of China (GB/T 12705-91) stipulates the test method for the anti-drilling properties of fabrics. Japan and the United States also have such test methods and standards, but the research on the anti-drilling performance of down jackets abroad is also relatively limited. This article will analyze and compare the test methods currently used at home and abroad, study the possible shortcomings of the existing methods, and propose new ideas for the research on the anti-drilling test method. 1. Description of the test method of fabric anti-drilling property (GB/T 12705-91) 1.1 Test principle The sample is made into a bag with a certain quality of down and placed in the rotating box of the testing machine equipped with hard rubber balls. The box rotates at a constant speed to bring the rubber ball to a certain height and impact the sample in the box to simulate the various squeezing, kneading, and collision effects of down products during taking. The drill is drilled from the inside of the sample by counting. The number of down roots is 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 rotating box that can rotate forward and backward, and an electrical control part. The revolving box is a cube with a smooth inner wall made of plexiglass. The internal dimensions are: 450 mm×450 mm×450 mm. The rotating speed of the revolving box is 45 ± 1 r/min. The testing machine has functions such as preset number of revolutions and automatic stop at full number (see Figure 1). 1.2.2 The rubber balls should be equipped with at least 12 homogeneous cyanide butadiene rubber balls with a hardness of 45 ± 10 Shore and a weight of 140 ± 5g. 1.3 Test procedure Place 10 rubber balls and a sample bag in the revolving box. The test is performed by presetting the forward and reverse rotations for 1000 times each, and the number of drilled piles will be counted after each full count and stop automatically. Add the number of down roots counted twice to obtain the test result of a sample bag. Each test is performed three times, and the test results are averaged. 2. Comparison of test methods at home and abroad Through the collection of relevant data, it is found that foreign research on the anti-drilling performance of down is also relatively limited. At present, the United States and Japan have relevant standards in this regard, but the Japanese research is not deep enough and only in the experimental methods. The revolving box method is adopted, and the experiment description only stipulates the two conditions that the fixed drop point of the rubber ball and the sample bag are fixed, and the other conditions are not mentioned. Therefore, we now compare the similarities and differences of the experimental methods between China and the United States (see Table 1). It can be seen from Table 1 that both China and the United States have adopted the rotary box method in the choice of experimental methods, and used the comparison in the control of the experimental process. A more scientific and effective method in Japan is to replace the fixed sample bag and turn it 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. Through comparison, China uses statistical drill downs to compare the evaluation of experimental results, while the United States only has qualified and unqualified In contrast, China is more scientific in experimental evaluation. Through research, this paper finds that the rotary box experiment method currently used at home and abroad has certain shortcomings. The analysis is as follows: 3. Analysis of the test equipment Before analyzing the experimental equipment, it is necessary to deeply understand the mechanism of down drilling and down, and down drilling down to study the fluffy performance of down. The bulkiness is an index to measure the degree of elasticity of down, which refers to the ability of down to naturally rise under pressure. Down is mainly in the form of piles. In each pile, there are dozens or even hundreds of fibers with basically the same internal structure, and each fiber will generate a certain repulsive force and keep the distance to the maximum. This makes the down fluffy. The fluffy properties of down make the down quilt close to the fabric squeeze outward, thereby generating an external pushing force to make the down close to the fabric. Usually the down fabric is anti-drilling down, the air permeability of the fabric becomes relatively poor (through a series of processes such as weaving and finishing), the use of the fabric makes the down jacket’s down-filled inner cavity stagnate a lot of still air, so when the down jacket suffers When the outside is squeezed, the still air will leak out from the pores of the fabric or the stitches left by the sewing. At this time, the down close to the fabric will follow the air to drill out of the cavity.
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