Rapid low-cost measuring method for fiber length

Abstract

The invention relates to a rapid low-cost measuring method for fiber length, which comprises the following steps of: fiber rod preparation: preparing loose fiber samples to be measured into a fiber rod with fibers which are straightened and are randomly arranged in parallel; tuft preparation: clamping any cross section of the fiber rod, combing floating fibers to obtain a tuft; digital image acquisition: generating a tuft digital image through image acquisition equipment and transmitting the tuft digital image to a computer; tuft curve extraction: extracting the pixel information of the generated tuft digital image and conducting processing and computation to the pixel information to obtain a tuft cure which represents the fiber amount of each cross section of the tuft; and length index calculation: calculating the four length indexes of the fibers according to the tuft curve. The rapid and low-cost measurement of fiber length is realized by adopting the method and the existing universal equipment is utilized to the utmost extent to develop the rapid low-cost measuring method for textile fiber length and matched hardware and software systems.

Description

technical field [0001] The invention relates to fiber length measurement in the field of optical measurement technology, in particular to a fast and low-cost fiber length measurement method, which is suitable for testing the length and distribution characteristics of short fibers such as cotton, kapok, cashmere and wool fibers. Background technique [0002] Length is an important quality index of textile fibers. It directly affects yarn strength, hairiness and fabric style. It is also an important basis for selecting spinning equipment, determining process and product design. The most classic method of testing fiber length is the group weighing method, but this method requires the operator to have professional skills, is time-consuming and laborious, and it is very difficult to group fibers with relatively short lengths such as cotton fibers and cashmere. [0003] The two automated testing systems currently in use are: HVI and AFIS. These two test systems can realize fast a...

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Problems solved by technology

In the same year, Zhang Zhijie et al. (Patent No.: ZL200820157317.6) also proposed to use a camera to obtain a digital image of a fiber bundle at one end, and then convert it into the data required for calculating the length through an information conversion system, claiming that the transmitted light and reflected light Yes, but it does not specify how to convert the image information into the data information required in the calculation formula of the length index

Although the above two self-built simple devices are cheap, due to the relatively large field of view, it is difficult to ensure the uniformity of the incident light source whether it is transmitted light or reflected light, and it is impossible to avoid the direct superposition of the uneven light source on the fiber layer thickness signal. Secondly, there is It is difficult to guarantee the accuracy and stability of the test due to the distortion of the pixels on the edge of the camera.

[0007] The above-mentioned digital image methods for fiber length measurement have not been applied so far. The defect is not only the poor signal accuracy, but also the lack of demonstration of the physical meaning of the curve obtained from the digital image and its relationship with the fiber length distribution. The obtained curve is regarded as the curve of the camera, and the average length is calculated by imitating the processing method of the curve of the camera, and some do not specify the calculation method of the length, but only vaguely explain

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