Method and system for measuring qaulity of multi component yarns

Abstract

A system for measuring the quality of multi-element yarn has a constant tension unit and a constant speed unit. Its measuring method includes putting a yarn in a detecting area where the are photoelectric detector and capactance detector respectively connected to computer, emitting infrared light by photoelectric detector to project the profile of said yarn to infrared receiving tube, A / D conversion, sending digital signals to computer, and data processing by computer to obtain different quality parameters.

Description

Technical field: [0001] The invention relates to the measurement of the mass, composition and change of the object by the capacitance method, and also relates to the measurement of the diameter and the change of the object when the object moves by the optical method, and is a system for detecting the quality of multiple yarns. Background technique: [0002] The capacitive evenness measuring instrument of the Uster company in Switzerland has been widely used in the yarn diameter measurement of the cotton textile industry, and the calculated spectrum is used to guide the production of the yarn. The theoretical basis of this method is the so-called "principle of constant mass", that is, when the mass of the yarn per unit length between the two plates of the capacitor is constant, the measured capacitance value also remains constant, so that the yarn The diameter of the wire does not change. However, this measurement method has its inherent drawbacks: [0003] 1. When there ar...

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Problems solved by technology

[0003] 1. When there are some neps in the yarn, the apparent diameter of the yarn may not change, but its capacitance value may change significantly, resulting in erroneous results

[0004] 2. When the cotton thread is mixed with other types of fibers, such as polypropylene fiber, acrylic fiber and other fibers, the apparent diameter of the yarn may not change, but because the dielectric constant of the impurity fiber is different from that of the yarn, the capacitance measured at this time Values ​​can vary significantly, which can also lead to erroneous measurements

[0005] 3. For the blended yarn, due to the inhomogeneity of mixing, the dielectric constant is also different everywhere, and the correct yarn diameter and its change value cannot be measured with a capacitive evenness measuring instrument

The disadvantages of this measurement method are:

[0007] 1. High-speed linear array CCD camera is used, the circuit is complex and the overall price is expensive

[0008] 2. Since the surface of the yarn is a diffuse reflector, the visible light powered by DC is used as the light source, and the measurement results are easily interfered by external stray light

[0009] 3. It cannot reflect the composition distribution ratio of blended yarn and its proportion unevenness

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