RU1575597C - Method of manufacturing thin felt - Google Patents

Abstract

The invention relates to light industry, in particular to a shaft of flax and felting production, and will find application in the manufacture of precision felts. It makes it possible to improve the operational properties of felt when using tape-and-tape mechanisms for household video filming machines. This goal is achieved through the use of protein fiber in a mixture with wool in a percentage of 80:20, needle-piercing of the formed combed canvas from the mixture to a surface density of 120-170 g / m2, followed by fusion in a multi-roll machine and final compaction on a decater in within 15-25 minutes Before decating, the felt is treated with low-temperature plasma. 1 s.p. f-ly.

Description

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The invention relates to light industry, in particular to the production of a shaft of flax and felt products, and will find application in the manufacture of fine precision high-density felts used in friction units, for example, in tape mechanisms of household video filming equipment.

The purpose of the invention is to improve the operational properties of felts by increasing their density and ensuring uniform thickness for the use of tape-recorder mechanisms of household video filming equipment in training units.

This goal is achieved by the fact that in the method of manufacturing thin felts and tape recorders used for training units for household shooting

video technology, which consists in the formation of a canvas of a given composition, preliminary compaction by

needle-piercing to a certain surface density, roll and final compaction, a mixture of fine carbonized merino wool with protein fiber in a percentage of 80:20 is used, needle-piercing of the formed combed canvas is carried out to a surface density of 120-170 g / m, the roll is molten on multi-roll machines, and the final compaction is carried out by decating for 15-25 minutes. At the final compaction, before decanting, the felt is subjected to low-temperature plasma treatment.

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The use of carbonized merino wool is dictated by the requirement of the consumer to avoid the inclusion of vegetable impurities, the presence of which can damage the recording tape, which will inevitably affect the quality of the recording.

Adding protein fibers to the mixture with wool allows almost double the density of the felt compared to pure wool, and using needle piercing as a pre-compaction speeds up the felling process by almost six times.

The felling of high-density thin felt is carried out on multi-shaft machines for the production of felt down hats in molten form. The use of pre-punctured canvases as a semifinished product makes it possible to obtain felt with a given density without using other types of roll machines.

The roll in molten form allows uniform shrinkage of the felt, since all fibers in the semi-finished product are in equal conditions and the pressure of the rotating rollers is the same in all areas of the material. In addition, such a roll makes it possible to obtain felt without blockages, scars and folds.

After the roll, the final compaction is carried out by decating, which is used to obtain new properties, namely, to increase the density of the felt and to achieve uniformity in thickness. In this case, thin felt is rolled to achieve the indicated properties for 15-25 minutes. Deviation from this time regime leads to density and thickness indicators that do not allow the use of felt for the specified purpose.

In order to improve all operational characteristics (density, strength, abrasion resistance, etc.), thin felt before decating: it can be treated with low-temperature plasma, as a result of which the surface of the wool fiber is modified, which expresses a partial change in the scaly layer,

Example. The combed canvas formed on the weaving transducer from a mixture of 64-70 k thin carbonized merino wool (GOST 6326-74) and vipolan protein fiber in a percentage of 80:20, with a surface density of 250--300 r / m2, is fed to the feed needle feed conveyor for preliminary compaction on both sides with the following parameters:

80 pr / cm2 x 2

Puncturing density Puncturing depth 4 mm After needle piercing, the semi-finished felt has

Surface

density120-170 g / m2

Thickness: 2.0-3.0 mm

Density 0.05-0.07 g / cm3

Then the semi-finished product is delivered to a Baner multi-part machine UW-216, which is used for felling downy headwear.

The pre-compacted needle-punched material is laid on the receiving conveyor of the UW-216 multi-roll machine in molten form and passed between working corrugated rollers with a certain wiring, which, in addition to rotating around its axis, oscillate.

The roll is carried out on a felling solution with a gradual increase in temperature from 35 to 55 ° C. Pressure on

work rolls 40 MPa

Amplitude

vibrations 1.5-2.0 mm

The number of passes 20-30

Felling solution concentration

(H2S04) 3-3 to 3-4 g / l

Felt after felling on a multi-shaft machine has the following indicators: Thickness1.3-1.5 mm

Density 0.20-0.38 g / cm3

As a result of the rolls in the expanded form, the felt is obtained without thickenings and, consequently, more uniform in thickness.

In order to improve the performance, the felts after felling can be treated with low temperature plasma in a specialized plant. The time of treatment with air plasma is 15 s, the air temperature is 35-40 ° C. This increases the density of the felt by 10%, its strength by 50%, the abrasion resistance by 30%, the elongation at break is reduced by 15%.

The final compaction of the felt is carried out on the decanter DZ-180 W - Steaming time 15-25 min

Cooling time 30 min. Vapor pressure 3 atm. As a result of this treatment, the felt is obtained with the following indicators:

Claims (2)

1.0 ± 0.15 mm 0.40-0.45 g / cm3 Thickness Density Resistance to Abrasion Over 3000 cycles Thus, the proposed method allows to obtain a thin felt of high density with strict requirements for thickness (equal thickness), satisfying the invention. Formula 1. A method of manufacturing a thin felt, in which the canvas is formed from a fibrous material, pre-compaction is made by needle-piercing, subjected to felling and final compaction, characterized in that, in order to improve the operational properties of the felts by increasing their density and ensuring uniform thickness for use in the nodes of the training tape mechanisms of household video equipment, when forming the canvas, a mixture of thin carbonized according to its operational characteristics performance requirements is used in the nodes of the tape mechanisms of the household video equipment, In addition to household filming video equipment, the developed material can be used in radio and instrument making. of merino wool with protein fiber in a ratio of 80:20, with preliminary compaction, needle piercing is carried out to obtain a surface density of 120-170 g / cm, felling is carried out on multi-shaft machines when feeding the canvas in molten form, and the final compaction is carried out by decanting, which lead within 15-25 minutes 2. A method according to claim 1, characterized in that, upon final compaction, the felt is subjected to a low-temperature plasma treatment before decating.