KR101338765B1 - Method of preventing the broken yarn when rewinding an elastic yarn - Google Patents

Abstract

The present invention is to dissolve the elastic yarn in the OETO (over-end take-off) method to remove the ballooning (ballooning) generated during the seasing process by spinning the material after the spinning process or spinning the adhesive or adhesive to the surface of the elastic yarns It is characterized in that the trimming is prevented.

OETO, Adhesion Promoter, Adhesion Promoter, Ballooning, Water Soluble Polyurethane, Maritime, Trimming

Description

{Method of preventing the broken yarn when rewinding an elastic yarn}

Figure 1 is a diagram showing the definition of the maritime class for ballooning determination that occurs when dissolving using the OETO type of dissolving machine.

The present invention relates to a method for preventing trimming by eliminating ballooning generated when dissolving an elastic yarn in an OETO (over-end take-off) method. By treating the material to increase the adhesion or adhesion between the yarn and the yarn to prevent ballooning (ballooning) generated during the maritime process characterized in that to prevent yarn trimming.

More specifically, using a kissing roller or bath during the spinning process using a water-soluble polyurethane material as a treatment agent to improve adhesion and adhesion to the surface of the yarn forming the outer layer of the elastic yarn winding body By continuous treatment or by winding it in a packaged state, and separately treating the outer layer of the winding body by spraying or rolling (rolling) method to prevent trimming of elastic yarn by eliminating ballooning generated during OETO method. It is done.

One of the biggest problems in using elastic yarns such as polyurethane is that when the outermost layer of the yarn package decreases over time, the adhesiveness between the yarn and the yarn decreases and gradually loosens and dissolves them in the OETO method. Ballooning occurs when the outer layer of the winding body is dismantled by the generated centrifugal force.

In this case, the firing amount of yarns disintegrated in the outer layer and the disintegration amount of yarn disintegrated in the inner layer becomes uneven or, in severe cases, ballooning generated in the outer layer is entangled in another ballooning or surrounding equipment, causing the thread to break. do.

In particular, in the case of the elastic yarn used for diaper production, this phenomenon is more serious because dissolution is proceeded at high speed without emulsifying the yarn surface.

Therefore, in the yarn maker manufacturing elastic yarn, research has been conducted to reduce ballooning caused by loosening of the outermost layer of yarn as time passes.

In the related art, in order to improve this phenomenon, a method of storing a yarn package under a steaming condition is desired.

In this case, however, a large thermo-hygrostat and a special space are required and a long time must be processed.

In addition, the adhesiveness between the yarn and the yarn is not so great that it is difficult to achieve the expected ballooning reduction effect, and this can cause severe damage to the paper pipe, which is generally paper-based, which has long-term moisture. have.

As another method, efforts have been made to improve the addition of titanium dioxide (TiO ₂ ) in the yarn, but in this case, there was still a problem that ballooning occurred in the case of the outermost layer.

The present invention is to solve the problems of the prior art as described above by treating the outer layer of the winding body to the adhesive layer and adhesive material by removing the ballooning (ballooning) generated in the outer layer of the winding body during OETO method in the ballooning (ballooning) The technical problem is to provide a method of dissolving elastic yarn which prevents yarn thread trimming.

The water-soluble polyurethane material which is used as the treatment agent of the present invention for achieving the above object is prepared by reacting organic diisocyanate with a polymer diol and diamine or monoamine as a main component.

The organic diisocyanate includes diphenylmethane-4,4'-diisocyanate, hexamethylene diisocyanate, toluene diisocyanate, butylene diisocyanate, hydrogenated P, P-methylene diisocyanate, isophorone diisocyanate and the like.

As the polymer diol, polytetramethylene ether glycol, polypropylene glycol, polycarbonate diol, and the like may be used.

The amines are used as chain extenders and chain terminators, and examples thereof include ethylenediamine, propylenediamine, hydrazine, triethylamine, diethylamine, monoethanolamine, and dimethylamine.

The water-soluble polyurethane material used in the present invention is prepared by using isophorone diisocyanate (IPDI) as organic diisocyanate, using polytetramethylene ether glycol as polymer diol, and reacting triethylamine (TEA) with amine. do. The water-soluble polyurethane material is used diluted in water, acetone, ethanol, dimethylacetamide, etc. In the present invention, it was used diluted in water.

At this time, the content of solids should be used 2 ~ 20wt% of the total weight of the treatment agent. More specifically, it should be 2-15 wt%, preferably 2-10 wt%.

If it is less than 2wt%, there is no ballooning inhibitory effect. If it is more than 20wt%, the adhesive force is excessive, so that it is difficult to dissolve, and trimming may occur.

The treatment agent may be treated with a kissing roller or bath during spinning, or once the yarn has been wound up, the treatment agent may be sprayed onto the surface of the wound body, or the yarn may be After winding up all, the method of processing the said processing agent on the surface of a winding body by a rolling method is used.

The elastic yarn winding body treated with the treatment agent on the outermost layer of the winding body in the above manner is subjected to the following three seaming depending on the magnitude of the force between the centrifugal force acting on the yarn and the adhesion force formed between the yarn and the yarn when OETO Form is generated.

(A) Centrifugal force> Adhesion between yarn: yarn occurrence

(B) Centrifugal force 접착 Adhesion between yarn: yarn without ballooning or extremely weak

(C) Centrifugal force <adhesion between yarn: yarn incapable of trimming

    As a result, the three types of sea yarn are controlled by the adhesion between the yarn and the yarn, which depends on the amount of water-soluble polyurethane treated on the yarn.

FIG. 1 is a diagram showing a definition of a class for determining a malfunction occurring when an OETO-type maritime apparatus is used.

Reference numeral in FIG. 1

1 is a fixed guide: the thread is rotated by the OETO method and then moves straight from this point.

2 is the firing point of the winding body: the point where the thread is first dismissed from the winding body under tension.

3 is the angle formed by the line connecting the fixed guide and the center of the winding body and the sea thread when in the ideal sea form.

4 is the angle corresponding to 1/2 of the reference number 3 outside the ideal nautical angle.

5 is Class 1 nautical form: an ideal nautical state in which yarn is linearly dismantled along the angle of the reference number 3.

6 is Class 2 maritime form: the yarn follows the trajectory formed by the angle of reference 3, but with a slight vibration.

7 is a level 3 maritime form: In fact, the trajectory of reference number 3 is separated and weak ballooning occurs, but the trajectory of reference number 4 is not separated and there is no possibility of connecting to the thread.

8 is a level 4 maritime form: the yarn is severely ballooned, which means it has departed from the trajectory of reference number 4.

After treating the water-soluble polyurethane on the surface of the yarn by using the above-mentioned method, the degree of ballooning generated during sea-sealing was evaluated based on the criteria defined in FIG. 1.

Hereinafter, embodiments of the present invention will be described, but the following examples are to be understood as merely illustrative of the present invention and not to limit the scope of the present invention.

   <Examples and Comparative Examples>

As the elastic yarn Creora (registered trademark of Hyosung Elastic Co., Ltd.) used in Examples and Comparative Examples, a C-100 (Bright) product, which was manufactured for a diaper and was not treated with an emulsion, was used.

     Solid content of the water-soluble polyurethane applied to the Example and the comparative example is illustrated in Table 1.

<Example 1-1>

Using a water-soluble polyurethane solution prepared in the solid content of Table 1 was applied to the outermost layer of the yarn package by coating method to obtain a package of 3kg polyurethane elastic yarn. The yarn package thus obtained was left at room temperature for at least 3 days to completely evaporate the remaining water, followed by direct dissolving using an OETO disintegrator, and observed the dissolution form at that time. The results are shown in Table 1.

<Example 1-2>

It carried out similarly to Example 1-1 except having changed the solid content of the water-soluble polyurethane as shown in Table 1.

<Example 2-1>

      A 3 kg yarn package was obtained by spraying with the solids content of Table 1. The nautical morphology was observed by the same method as in Example 1, and the results are shown in Table 1.

<Example 2-2>

It carried out similarly to Example 2-1 except having changed the solid content of water-soluble polyurethane as Table 1.

<Example 3-1>

3 kg yarn package was obtained by the immersion method of the winding body in the solid content of Table 1. The nautical morphology was observed by the same method as in Example 1, and the results are shown in Table 1.

<Example 3-2>

It carried out similarly to Example 3-1 except having changed the solid content of the water-soluble polyurethane as shown in Table 1.

<Comparative Example 1-1>

The 3 kg yarn package was obtained by the application method in the solid content of Table 1. The nautical morphology was observed by the same method as in Example 1, and the results are shown in Table 1.

<Comparative Example 1-2>

It carried out similarly to the comparative example 1-1 except having changed the solid content of water-soluble polyurethane as Table 1.

<Comparative Example 2-1>

The 3 kg yarn package was obtained by the spray method with the solid content of Table 1. The nautical morphology was observed by the same method as in Example 1, and the results are shown in Table 1.

<Comparative Example 2-2>

It carried out similarly to the comparative example 2-1 except having changed the solid content of water-soluble polyurethane as Table 1.

<Comparative Example 3-1>

3 kg yarn package was obtained by the immersion method of the winding body in the solid content of Table 1. The nautical morphology was observed by the same method as in Example 1, and the results are shown in Table 1.

<Comparative Example 3-2>

It carried out similarly to the comparative example 3-1 except having changed the solid content of water-soluble polyurethane as Table 1.

According to the present invention, by treating a water-soluble polyurethane material with an appropriate concentration within 1/3 of the outer layer winding thickness of the elastic yarn winding body, it effectively eliminates ballooning of the outermost layer generated during the process of dissolving the conventional OETO wound body. It can increase the fairness and productivity by preventing the trimming that occurred during the process.

Claims (4)

A method for preventing thread trimming during OETO (over-end take-off) method of elastic yarn, characterized in that the elastic yarn is treated with a water-soluble polyurethane material. The method of claim 1, wherein the water-soluble polyurethane material is a dilution of the water-soluble polyurethane in a solvent. The method according to claim 1, wherein the water-soluble polyurethane material is a continuous method of treating the elastic yarn using a roller or a treatment bath during spinning of the elastic yarn, or a non-continuous method of treating the winding body of the elastic yarn by spraying or rolling. A method for preventing thread trimming during dismissal of an elastic yarn. The method of claim 1, wherein the water-soluble polyurethane material has a solid content of 2 to 20 wt%.

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