Method for detecting specific resistance of short fibers of chemical fibers

Abstract

The invention relates to a method for detecting the specific resistance of short fibers of chemical fibers. The method comprises the following steps that (1) sampling is carried out, and moisture regulation at a proper time is carried out according to the convention moisture regain of samples; (2) two parts of fibers of the weight of 15 g are taken from the sample subjected to moisture regulation; (3) two equivalent resistors R3 and R4 are connected in series to form a branch, a resistor box R1 and a cuboid test box R2 with a cover are connected in series to form the other branch, the two branches are connected in parallel and then connected with a button switch K and a direct current power source E, and a test device is built up; a grounded metal shielding box covers the test box, two plate electrodes are arranged at two sides of the walls inside the box, the length of each plate electrode is 6 cm, the width of each plate electrode is 4 cm, and the interval between the two plate electrodes is 2 cm; (4) the 15 g of samples are injected into the test box, and the box cover is arranged; (5) the resistance of the resistor box is regulated, so that the value of a voltmeter ranges from -10 mV to 10 mV; (6) the specific resistance of the fibers is worked out according to the detected resistance value. The method for detecting the specific resistance of the short fibers of the chemical fibers is simple and convenient to conduct, easy to realize, and suitable for conductive and non-conductive chemical short fibers.

Description

technical field [0001] The invention relates to a method for detecting the specific resistance of short chemical fibers, in particular to measuring the volume specific resistance of non-conductive short chemical fibers and short conductive chemical fibers by using an electric bridge method. Background technique [0002] Whether it is a non-conductive chemical fiber or a conductive chemical fiber, there are index requirements for its conductive performance, and corresponding tests need to be carried out. For non-conductive chemical short fibers, my country has stipulated its conductivity since the 1970s, and the specific resistance is used to indicate the quality of the fiber's conductivity. In the late 1970s, a fiber specific resistance meter was developed. In 1993, GB / T14342-1993 "Test Method for Specific Resistance of Synthetic Short Fibers" was formulated based on the principle, performance and operation method of the fiber specific resistance meter. This standard has alw...

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Problems solved by technology

[0004] Under the existing technical conditions, non-conductive chemical staple fibers are tested according to GB / T 14342-1993 "Test Method for Specific Resistance of Synthetic Staple Fibers", and conductive chemical staple fibers are tested according to GB / T 12703.4-2010 "Evaluation of Electrostatic Properties of Textiles Part 4" : Resistivity" test, thus causing the following problems: (1) because the conductive chemical short fiber and the non-conductive chemical short fiber are not tested by the same method and the same instrument, the test results are not in the same unit, and the data are not comparable

(2) The difficulty of testing the two fibers is different. To test the conductive short fiber, the fiber must be manually made into a sample cake with uniform thickness. It is difficult to ensure that the size of each sample cake is consistent. volume to ensure data reliability

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