SU1605174A1 - Method of determining air permeability of cocoon shell - Google Patents

Abstract

The invention relates to the silk industry and the silk industry, can be used in the silk stud and silk milling factories and allows to increase the accuracy of the determination results, as well as to reduce the time and raw material costs for testing. Through the sealed poles of the cocoon sucked air, which passes through the entire surface of the shell. Breathability is determined by the value of the aerodynamic resistance of the envelope to the air flow. 1 tab., 2 Il.

Description

The invention relates to the field of silk production and the silk industry and can be used in Geshm-Silkostantsi and silk-milling factories.

The purpose of the invention is to increase the points. the results of the determination and reducing the time and raw material costs of testing.

FIG. 1 shows a diagram of an apparatus for implementing the method; figure 2 is a diagram of the installation of the cocoon.

The method is implemented as follows.

A sample of cocoon 1 on the pole side is clamped between calibrated tips with rubber suckers 2, which seal the cocoon strips and are connected to measuring chamber 4 by means of tap 3 and rubber hoses 4. Measuring chamber 4 creates a reference vacuum (Pp) by means of a vacuum pump 5. The air passes through the openings of the measuring tip 2 and monitors the 1st cocoon, as well as through the cock 6 and the opening in the measuring chamber 4, tightly covered with a movable valve, creating a deformation of the elastic beam on which the strain gauge 7 is installed. 1 s converter, is fed to the input of the amplifier 8 direct current with a regulating 1 m gain and is recorded by an electronic measuring device 9. The reading of the device is proportional to the value of the difference of atmospheric pressure (PD) and vacuum (PP) in the measuring chamber applied to the surface of the cocoon shell, which creates resistance to air flow, depending

about:: p vj

four

from the throughput capacity of the closed surface of the cocoon shell. The device is graduated in the conventional unit of airflow, easily and simply prepared for operation. For this, the tap 6, when the tap 3 is closed, in the measuring KdWepe sets the maximum level of the reference vacuum, this corresponds to the maximum scale of the electrical measuring instrument. The minimum value of the instrument's scale (vacuum in the measuring chamber) is established by a potentiometer. Setting zero of the DC amplifiers with the tap 3 open and the tip of the measuring cocoon missing. Depending on the magnitude of the reference vacuum installed in the measuring chamber, the gain of the DC amplifier is chosen, which is necessary to register the measured value within the scale of the electrical measuring instrument.

For example. The mass of air-dry cocoons Tetrahybrid No. 3, of medium caliber, variety mixture 1 + 2 + 3 varieties, yield of 1986 was divided by air permeability into five groups (very high - I, high - II, medium - III, low - IV , very low - V).

For the same sample of cocoons in the amount of 1000 pieces. air permeability was determined with a tenfold repetition. According to the results of measurements, the pattern of distribution of cocoons by air permeability in the sample mass of cocoon raw material was determined, the results of which are tabulated.

As can be seen from the measurement results (table), the proposed method for determining air-permeability allows to get a picture of the distribution of cocoons by their air permeability.

The use of the present invention allows to obtain information about the air permeability of a whole cocoon without the use of calculations, and the testing process is accelerated, since it is necessary to specially prepare shell samples (cut, etc.). After testing, the cocoons can be recycled, which allows to save valuable raw materials.

Claims (1)

Invention Formula about The method for determining the air permeability of the cocoon shell, predominantly the whole, including passing air under constant pressure through the cocoon shell, which aphidates so that, in order to increase accuracy and reduce the time and raw material for testing, the poles of the test cocoon are sealed from the surrounding environment, and the passage of air through its shell is carried out by sucking air through the poles of the cocoon, and the air permeability is estimated by the value of the aerodynamic resistance of the shell air flow . 1 & Set ... About )) tt RF 1 2 d4 Pa FIG. I Editor L, Gratilllo Compose G.Novikova Tehred m.Dndyk Order 3451 Circulation 504 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5 Production and Publishing Combine Patent, Uzhgorod, Gagarin Street, 101 Proofreader L. Beskid Subscription