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Method for testing air permeability of silkworm cocoons
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A test method and air permeability technology, which is applied in the field of silkworm cocoon air permeability testing, can solve the problems of testing air permeability, achieve the effect of simple test method, high test accuracy, and solve the problems of air permeability test
Active Publication Date: 2022-02-25
YANCHENG INST OF IND TECH
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[0004] Since the cocoon is a three-dimensional structure that is approximately elliptical, it is impossible to test its air permeability according to the conventional method of testing the air permeability of fabrics.
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Embodiment 1
[0027] A method for testing air permeability of silkworm cocoons, such as figure 1 As shown, the specific steps are as follows:
[0028] 1. Determination of the inner cavity size of silkworm cocoons
[0029] (1) Silkworm cocoons, such as silkworm cocoons, present relatively regular ellipsoids. For some wild silkworm cocoons with irregular appearance structures, such as castor silkworms and tussah silkworms, after removing their messy cocoons, their inner cavity is also relatively regular. Approximate ellipsoid.
[0030] Use a vernier caliper or other tools to measure the length (major axis) of the two longitudinal ends of the ellipsoid cocoon 1, and record half of this value (semi-major axis) as a cm;
[0031] Use a blade or other cutting tools to cut the cocoon 1 along the cross-section, and use the cut cocoon 1 as a test sample. Use a vernier caliper to measure the lengths of the two minor semi-axes at the largest cross-sectional area of the inner cavity of the cocoon 1,...
Embodiment 2
[0042] A method for testing air permeability of silkworm cocoons, the specific steps are as follows:
[0043] (1) In this embodiment, the castor cocoon is used as the test object, and the semi-major axis a=3.35cm of the silkworm cocoon is measured by a vernier caliper; Measure the lengths of the two minor semi-axes at the largest cross-sectional area of the cocoon lumen, and get b=2.05cm and c=1.12cm.
[0044] (2) YG461 automatic air flow meter is used, and the area attached to the air flow meter is selected as 5cm 2 Fix the split silkworm cocoon on the fixed value circle, according to ISO9237 and other related standards, test the air permeability of the silkworm cocoon on the air flow meter, and record the cocoon test area as S test , set the differential pressure to 100Pa, and the test result displayed by the breather is APR test = 63.698 mm / s.
[0045] (3) After the test is over, tear off the outer cocoon coats from the two parts of the dissected silkworm cocoon, leavi...
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Abstract
The invention discloses a method for testing the air permeability of silkworm cocoons. The method specifically comprises the following steps: firstly, measuring the size of an inner cavity of a silkworm cocoon, then splitting the silkworm cocoon along the cross section, and taking the split silkworm cocoon as a test sample; fixing the test sample on a fixed value ring attached to a fabric air permeability tester, and testing the air permeability of the silkworm cocoon; respectively weighing the total weight of the silkworm cocoon and the weight of the test sample, and respectively calculating the surface area of the whole silkworm cocoon and the surface area of the test sample through a formula I and a formula II; and finally calculating the air permeability of the silkworm cocoon through a formula III. The method for testing the air permeability of silkworm cocoons is clear in test principle, simple in test method and high in test accuracy, and solves the problem of air permeability test of non-planar materials.
Description
technical field [0001] The invention belongs to the technical field of textile testing, and in particular relates to a method for testing the air permeability of silkworm cocoons. Background technique [0002] The ability of air to pass through the fabric is the breathability of the fabric. It directly affects the wearing performance of the fabric. For example, the fabric used in summer needs to have better air permeability, while the outerwear in winter should have less air permeability to ensure that the clothes have good windproof performance and prevent heat from radiating. For some fabrics used in national defense and industry, air permeability is of great significance. For example, parachutes require high air permeability, and tarpaulin should not only be durable but also have good air permeability. In the prior art, a fabric air permeability meter is generally used to measure the air permeability of the fabric. The fabric air permeability meter measures the amount o...
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