SU1223145A1 - Method of determining qualitative characteristics of fibrous materials - Google Patents

Abstract

The invention makes it possible to increase the accuracy of measurements in the method for determining the quality characteristics of fibrous materials. A sample of kenaf fibers is placed in chamber 3, compacted by mechanisms 4 and 5, compressed by pistons 6 and 7 to a specific bulk density, at which sound oscillations with a frequency of 100-175 Hz created by generator 1 and emitter 2. Sound vibrations transmitted through a sample of fibers are converted by receiver 8 into electrical oscillations. The signal U from the output of the receiver 8 is proportional to the pressure.; sound vibrations transmitted through the fiber sample enters block 9. From the output of the latter, the signal enters computing block 10, in which the calculation is performed using the formula + a, fnU, where F is a discontinuous load on the fibers; a n and a are the constant coefficients determined during calibration of the instrument. The signal from the output of unit 10 enters display unit 11, where it is recorded on a digital display. 1 il. (L iff P

Description

The invention relates to instrumentation technology and can be used in the bast and textile industries primarily for determining the grade of kenaf fibers.

The purpose of the invention is to increase the measurement capacity.

The drawing shows a device that implements the proposed method.

The device contains an oscillation generator 1 connected to a sound oscillator emitter 2 installed at the entrance of the chamber 3 for a sample of fibers, mechanisms 4 and

5 seals connected to pistons

6 and 7, the receiver 8 sound vibrations installed at the output of the camera 3 and connected through measuring 9 and computing 10 blocks with the block 11 of the display.

The device works as follows.

A sample of constant-mass kenaf fibers is placed in chamber 3. With the help of compaction mechanisms 4 and 5, the sample is compressed by pistons 6 and 7 to a specific bulk density at which sound oscillations of a given frequency, generated by generator 1 and radiator 2, are passed through the sample. the fibers passing through the sample are converted by the receiver 8 into electrical oscillations. The signal from the output of the receiver 8, which is proportional to the pressure of the sound waves transmitted through the fiber sample, enters the block 9. As a block 9 you can use a standard voltmeter, for example, B7-16. From the output of block 9, the signal enters

Editor E. Papp

Compiled by G. Novikova

Tehred O. Sopko Correspondent of M. Samborska

Order 1706/47 Edition 778 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raush Ska nab., 4/5

Branch ShSh Patent, Uzhgorod, st. Design, And

computational unit 10, in which the calculation is performed according to formula i

F a +,.

where F is the breaking load of the fibers; a and a are constant coefficients determined during calibration of the instrument, for example, by the method of least squares. As a block 10 you can

d use a standard computer, for example, BZ-34. The signal from the output of the unit 10 enters the display unit 11, where it is recorded on a digital display.

J The sample is compacted to a bulk density of 300-400 kg / m, sound vibrations are applied in the frequency range of 100-175 Hz. With the indicated values of the parameters used, the measurement accuracy in determining the grade of kenaf is 2.6%. Improving the accuracy of determining the grade of kenaf leads to a decrease in re-grading, which makes it possible to obtain a rigorous economic effect.

Claims (1)

Invention Formula The method of determining the quality characteristics of fibrous materials, mainly kenaf fiber grades, consists in compaction of a sample of fibers of a given mass, passing sound vibrations through it, measuring their attenuation and evaluating the value of the desired indicator, differing in that, in order to improve measurement accuracy The sound vibrations with a frequency of 100-175 Hz are passed through the probe. five