Manufacturing method and detection method of double-end random beard for cashmere fiber length test

Abstract

The invention relates to a manufacturing method of a double-end random beard for a cashmere fiber length test. The manufacturing method mainly comprises the following steps: preliminarily manufacturing double-end random beard; removing floating fibers in the beard; and removing large crimps and convolution crimps of the fibers. The invention also relates to an instrumented detection method of a cashmere fiber length. The method has the following beneficial effects: (1) the fibers in the prepared tuft for the length test do not contain large crimps and convolution crimps, the length of the fibers tested in a state is consistent with the length of the fibers tested by a manual arraying method accepted at home and abroad, and a current manual arraying method test of the cashmere length can bereplaced by a rapid, objective and accurate instrument test; and (2) the sample is more representative, and a test result is more reliable.

Description

technical field [0001] The invention relates to the field of instrumented detection of cashmere fibers, in particular to a sample preparation method in the detection method of cashmere fiber length and an instrumental detection method of cashmere fiber length based on the sample preparation method. Background technique [0002] The length and distribution characteristics of cashmere fiber are the necessary inspection items to evaluate its quality, directly affect the selling price and yarn performance, and are also an important basis for determining the spinning process and use. At present, except for cashmere, almost all fibers have mature instrumented length measurement methods. However, the standardized test method for cashmere length recognized at home and abroad is still the manual method, such as the manual method specified in GB18267-2013 "Cashmere" , ISO137: 2015, IWTO8: 2011, ASTM D2130: 2013, the main reason is that cashmere fibers generally have high curls, and th...

AI Technical Summary

Problems solved by technology

However, this test method has a major defect: the fiber is tested in a highly crimped state, as shown in Figure 2(a), because research at home and abroad has shown that the crimps of different varieties and different qualities of cashmere vary greatly, and the crimps of high-quality cashmere Greater than inferior cashmere

Secondly, the photoelectric method also has the following obvious defects: (1) The sampling is not ideal, and one fiber may be hooked by multiple comb teeth at the same time, as shown in Figure 2(b), fiber A is hooked by four comb teeth, and fiber B is hooked by four comb teeth. It is hooked by 3 comb teeth, fiber C is hooked by 2 comb teeth, etc. Only D, E and other fibers are ideally hooked by one tooth, and the probability of long fibers being caught by multiple comb teeth is greater than that of short fibers. This will lead to a deviation in the representativeness of the sample; (2) When preparing the sample, the brush only randomly combed the surface of the whiskers a few times, far from cleaning the floating fibers in the middle of the whiskers and near the clamping line

(3) During the test, the system starts at 3.8mm away from the whisker clamping line and ends at 60mm, so that the sensor cannot measure the complete whisker, resulting in fibers with a length of less than 3.8mm and more than 60mm in the whisker to be tested The loss of data directly affects the accuracy of index results such as fiber short-lint rate and average length of root number; (4) lack of theoretical relationship between detection amount and fiber length distribution, this method has been used in the cotton field for decades It is proved that its length variation index and short-lint rate have no application value, and lack of length distribution index

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