SU964042A1 - Method and installation for working ,particularly, sizing of threads - Google Patents

Description

neither sufficient compactness nor effective protection of threads, completely or partly composed of synthetic fibers, is achieved. When recycled in a similar way sanded thread unwanted abrasion occurs. Therefore, these threads should be treated with special dressing agents from synthetic high polymers selected on the basis of previously named classes of products. The application of these polymers to filaments and their removal from textiles is often costly, and they also pollute the waste waters of enterprises and enrich textiles, since such kind of dressing tools, as opposed to natural polymers, cannot be split or split only with the help of special preparation methods.

Adherence can be achieved, for example, by the force of polymer surface change with a brief heat-up, as well as by the influence of aggressive substances, for example, halogens or hot oxidants, for example, chromic acid. When warming up significant difficulties; associated with temperature control, gas / air mixture composition and adjustment for different flow rates.

In a chemical treatment method, the substrate must undergo a whole series of baths. This is associated with high costs and negative effects on the bulk properties of the yarn.

The treatment of fibers with gas discharges in order to improve their textile-physical properties is also known.

It is known to use the discharges of electrically charged particles to improve the adhesive properties of the surface of polymers. It is also known to use differently created plasmas (glow discharge, corona discharge) to improve surface properties in the form of fibers or flat surfaces.

Using ionizing radiation, the resulting ionizing gas atmospheres (non self-sustaining discharge) should, accordingly, DD-PS 100 761 improve the physical properties, irregularity for breakage and abrasion, shrinkage and stability of the form of fiber, fiber strips and textile fabrics.

 Such improved properties must be achieved with DD-PS 101 929 and DE-OS 2 361 348 using a single-line high-frequency flare discharge or a non-high-frequency or micro-volt non-electrode. Accordingly, to achieve the effect of modifying textile substrates, DD-PS 122 692 uses a unipolar or electrodeless discharge. By "electrodeless, it is necessary to understand that the iodine part of the radiation is not in a vacuum, and not in a special chamber.

The use of gas discharges for volokoi, fiber leite and textile cloths is still limited to the improvement of the physical properties of the processed products. At the same time, it should be noted that inappropriate bits were used.

Flare and electrodeless discharges are not suitable for creating wide, homogeneous, low-pressure plasmas for continuous processing of irides and low costs. For this, shielded, cooled flat electrodes, which have been proposed in DD-PS 125 794, should be used more.

The aim of the invention is to eliminate

the disadvantages arising from the processing of sanding threads, and the thickness of or partially consisting of synthetic fibers. In addition, it is imperative to achieve the use of brittle, easily split after

Enhance dressing tools, iairimer, based on starch and cellulose or protein-based adhesives and thereby achieve a more cost-effective use of dressing agents.

The basis of the invention is to improve the negatively affecting low adhesion of sizing agents to threads, partially or partially, with synthetic fibers, and, as a result, to use easier and cleavable biological sizing agents for shedding wastewater: crashes; 1l, starch and cellulose derivatives or

protein-based adhesives, excluding the disadvantages arising from the processing of sanded yarns, iairimer as a result of insufficient operability of the thread, the ineffective protection of the yarn and excessive wear. The threads may be yarn, click, torsion and the like.

Threads in the form of a base or in a skein, fully or partially composed of synthetic fibers, are subjected to a low-pressure gas discharge for a short time, and it is preferable just before you take the preparation, strain, or the mortar.

With irradiation of this gas discharge, the low pressure operates in the pressure range from 1 to lOO Pa, with a power density of 0.5 W / cm for 2-8 s.

Gas discharge and low pressure pro11zpo,; t in the gas atmosphere, as

working gas using air oxygen

or a mixture of oxygen with another gas. However, as a working gas, it is possible to use a gas that, when discharged, as a result of a secondary reaction, forms oxygen or is released from the substrate as a result of gas flow to the atmosphere.

As a result of the effect of gas discharge of low pressure, a better adhesion of the sizing agent to the threads is achieved, completely: or partially, with synthetic fibers. In addition, the method allows the use of cheap dressing materials, which are easy to remove from biologically after the beating of textile canvases made from polished yarns.

In order to carry out the sizing, the proposed method uses a sizing unit in which a known device with a low-pressure gas discharge is installed horizontally or vertically in front of the sizing bath.

In a device with a gas discharge of low pressure, the threads are briefly subjected to a gas discharge of low pressure, and then fed into a sizing bath. In conclusion, drying takes place, for example, with a multi-cylinder or a convective dryer.

The drawing shows schematically an installation for dressing a yarn with a device for processing low-pressure gas discharges and a drying part in the form of a multi-cylinder dryer.

A device with a gas discharge of low pressure 3 is horizontally positioned between the frame with the converging spools on the base 2 for the base 1 and the sizing bath 10 of the sizing unit so as to sand the threads completely or partially composed of synthetic fibers. After the base 1 has passed a pair of rollers to the inlet vacuum slit 5 and the inlet vakuzmnaya slit 4, it is led further by a guide roller 8 between the water cooled flat electrodes 9, 9a and subjected to a high-frequency gas discharge. In a device with a gas discharge of low pressure, a pressure of 10 Pa prevails. Air is used as the working gas. The residence time of the substrate in the discharge field formed between the two flat electrodes 9 and 9a is 5 seconds. Flat electrodes 9, 9a are connected to a high-frequency generator G, equipped with a high-frequency power of 0.5 W / cm2 at a frequency of 27, 12 MHz.

Then, the base 1, through the guide roller 8a, falls into the outlet vacuum slot 6 and, the passage between the pair of rollers 7 of the exit vacuum gap 6, leaves the installation with a low-pressure gas discharge 3. After the base 1 has left the installation with a low-pressure gas discharge 3, it is fed through a guide roller 11 into a shielding bath 10, to which the immersion roller 12 and a pair of squeezing rollers 13 belong. In the sizing bath 10 there is a sizing solution containing, as a sizing agent, 80 g / l of biodegradable starch modifier. The base 1, after being pressed, is subjected to wet separation 14 and is fed to a multi-cylinder dryer 15, where it is fed to the substantial cylinders 17 and 17a-g via a guide roller 16. Drying basics. I is carried out according to a known technology of drying threads, completely or partially consisting of synthetic fibers. After the warp has left through the guide roller 16a of the multi-cylinder dryer 15, a dry separation 18 of the warp 1 occurs. Thereafter, the warp 1 enters the winding device 19, containing the reusable reed 20, the discharge roller 21 and the guide rollers 22, 22ft, on the base 23.

In the described device with a low-pressure gas discharge 3, the treatment can also be carried out with oxygen as the working gas. Consumed at

This high-frequency power density is also equal to 0.5 W / cm, the processing time is 3 s. “Arboxymethylcellulose with a concentration of 60 g / l can be used as a sizing agent. Drying and winding occurs as described above.

Claims (3)

1. A method of processing, in particular, sizing, threads, wholly or partially consisting of synthetic fibers, is necessary in that the threads in the form of a base or in a skein temporarily and continuously subject a gas discharge to a low direct pressure before a known device is applied to the preparation, dressing or similar nm. 2. A method according to claim 1, characterized in that it operates in a pressure range from 1 to 100 Pa at a power density of 0.5 W / s.m2 for 2-8 seconds. 3. Installation for dressing and carrying out the method according to claims. 1 and 2, characterized in that before dressing Bath 10 is arranged horizontally or vertically with device 3 with a low pressure gas discharge. It is recognized as an invention according to the results of the examination carried out by the Office for Invention German; Democratic Republic. 3 9a 8a It 12 W 13 1t IS, 8. , I7d t7b 18 20 2L ; s 17c 7a.