KR20000027867A - Method for producing wound body of polyurethane elastic yarn - Google Patents

Abstract

PURPOSE: A method for producing a winded body of polyurethane elastic yarn is provided to improve a winding property by reducing the adhesion of the polyurethane elastic yarn in the case having large winded amount of the polyurethane elastic yarn. CONSTITUTION: A winded body of polyurethane elastic yarn is produced by winding a large amount of polyurethane elastic yarn in a bobbin with the width under 50mm. The winding property is improved with an existing content of emulsion by controlling the speed of a spinning roller to maintain a regular shrinkage. The polyurethane elastic yarn has the shrinkage under 7% to obtain the excellent winding property. The required shrinkage under 7% is able to do with the control of speed between common two-three rollers passed before winding the polyurethane elastic yarn in a corn. The shrinkage is controlled by winding with rapidly shrinking the polyurethane elastic fiber extended at the winding by being the speed of the front roller of winder larger than the speed of the winder.

Description

Method of manufacturing polyurethane elastic yarn winding

The present invention relates to a method for producing a polyurethane elastic yarn winding body, and particularly to a method for producing a polyurethane elastic yarn winding body that can be excellent in maritime properties by reducing the adhesive force of the polyurethane elastic yarn even when the volume of polyurethane elastic yarn is large. It is about.

Polyurethane elastic yarn has good elasticity and excellent elasticity, so it is not only widely used as a covering yarn or core span yarn in stockings or women's underwear, but also widely used in stretch fabric for making swimwear or general clothing together with polyester, nylon, and cotton yarn. In recent years, it has been spotlighted as a material that can replace the rubber used in the band for sports clothes, diaper band. In addition, the demand for stretch fabrics continues to increase with changes in lifestyles such as the pursuit of convenience of life and diversification of fashion.

Polyurethane elastic yarn, which is mainly used for stretch fabrics as described above, is used by being wound on a cone, and used in a loom wound on a krill of a size that is easy to work on a loom through a regular work or as a cone. At this time, in order to maintain a constant tension when dissolving the yarn in the cone state, excellent dissociation property is required, and in order to prevent productivity from being lowered due to frequent replacement of the cone, it is required to have a large amount of the cone.

When the volume of polyurethane elastic yarn is small, the problem of desalinity due to shrinkage of polyurethane elastic yarn wound due to elongation due to the low sand layer is not a big problem compared to the case where the volume of polyurethane elastic yarn is large, and it is excellent even with a low fluid content. You can get nautical properties. However, the problem that productivity is lowered due to frequent cone replacement in the machining process is inevitable.

On the other hand, when the volume of polyurethane elastic yarn is large, productivity in a process is high. However, since the four layers are increased and a large pressure is applied to the inner layer, the wound polyurethane elastic yarns adhere to each other and thus the seam property is poor. As such, if the seaability is bad, the sea power is not constant, so that a line is generated in the product during the machining process, or a defect in which the length is not constant is generated. If the seaability is very bad, even if the seam is not dissolved, the elastic yarn rotates along the cone, resulting in the trimming phenomenon and the line operation is interrupted.

Therefore, it is possible to consider a method of using a large amount of emulsion in order to improve the maritime properties by preventing the polyurethane elastic yarns are not adhered to the cone, this method has a problem that it is difficult to remove the emulsion in the processing process, many The use of a positive emulsion does not improve the maritime properties beyond a certain level. In addition, lowering the shrinkage rate of the polyurethane elastic yarn may be considered, but in this case, the dissolution property is improved, but the collapse of the four layers is caused, which makes it difficult to wind the polyurethane elastic yarn.

Therefore, various efforts have been made to improve the dissolvability of the polyurethane elastic yarn, and in order to improve the dissolvability by reducing the adhesiveness of the polyurethane elastic yarn as described above, US Patent No. 3,039,895 discloses a specific metal salt in the fiber oil. Disclosed is a method for producing a polyurethane elastic yarn having excellent sea repellency by dispersing. At this time, the metal salt is a specific metal salt of a specific acid, and the metal component of the salt is selected from lithium, sodium, potassium, rubidium, cesium, magnesium, calcium, strontium, barium, zinc, cadmium, and aluminum, and the acid component is 8 to 22 carbon atoms. Saturated or unsaturated fatty acids are selected.

U.S. Patent No. 3,296,063 also proposes a method for producing polyurethane elastic yarns having excellent disintegration properties using a small amount of metal salts in a fluid consisting of a small amount of polyamylsiloxane and a large amount of polydimethylsiloxane.

In addition, Japanese Laid-Open Patent Publication No. 59-26573 discloses a method of adding a metal compound of thiohydroxy acid to a polymer in any step prior to spinning to enhance running and disintegrating properties during spinning.

In addition, Japanese Patent Laid-Open No. 60-239519 discloses a method of improving collapsing silica and running friction characteristics by using colloidal silica in an emulsion, in which metal soap salts are used together.

In addition, Japanese Patent Laid-Open No. 56-107010 discloses a method for enhancing maritime properties by using fatty acid metal salts.

In addition, Japanese Patent Laid-Open No. 5-5277 discloses a method for enhancing maritime properties by using polyorganosiloxane as an emulsion for elastic fibers.

However, the method of improving the maritime properties by using an oil of the prior art, it is difficult to greatly improve the adhesiveness of the yarns due to the pressure of the outer layer of the inner layer after winding the thread in the bobbin or package. In addition, it is difficult to remarkably improve the maritime properties by mixing various additives with the polymer. In addition, in the prior art, when the volume of polyurethane elastic yarn is increased by more than a certain amount, the resolution is rather deteriorated, and thus, when the volume is increased, it is inappropriate as a method of improving the resolution.

The present invention has been made in view of the above-described conventional problems, it is possible to not only significantly improve the maritime properties with the existing emulsion content, but also to maintain a constant coastal force even if the volume is increased to reduce the product defect rate in the processing process. An object of the present invention is to provide a method for producing a polyurethane elastic yarn winding that can be reduced.

1 is a schematic configuration diagram showing an apparatus for performing a method for manufacturing a polyurethane elastic yarn winding body according to the present invention.

Figure 2 is a block diagram showing an apparatus for performing a nautical sea test for the wound body produced by the manufacturing method according to the present invention.

<Explanation of symbols for the main parts of the drawings>

1: first spinning roller, 2: second spinning roller,

3: winder

In order to achieve the above object, a method for producing a polyurethane elastic yarn winding body according to the present invention, in the method for producing a polyurethane elastic yarn winding body by winding a large amount of polyurethane elastic yarn wound on a bobbin with a width of 50mm or less, It is characterized by remarkably improving the maritime properties by adjusting the spinning roller speed to maintain the existing emulsion content.

In the case of polyurethane elastic yarn spinning, generally, two or three rollers are generally passed before the yarn of 40 denier or less drawn from the spinning barrel is wound. At this time, the speed between the rollers determines the tension when the thread is wound around the cone. This tension acts as a pressure which is opened inside the wound yarn, thereby increasing the adhesiveness of the yarns. Therefore, in the case of winding the thread by applying a constant tension by the usual method, if the thread is wound over a certain weight (350-400 g), the adhesiveness between the yarns increases due to the increase in shrinkage amount, and even when a special oil or additive is used, It is difficult to improve. In addition, if the shrinkage rate is too low, but the seaability can be improved, causing the collapse of the four layers it becomes a factor that makes the winding of the polyurethane elastic yarn difficult.

In view of this point, in the present invention, a fine polyurethane elastic yarn having a fineness of 40 denier is used. In order to obtain excellent sea property, it is preferable that the polyurethane elastic yarn has a shrinkage of less than 7%. When using such a polyurethane elastic yarn it is possible to manufacture a large winding body of 500g to 1kg.

Shrinkage for polyurethane elastic yarn can be evaluated in the following manner.

First draw a black line parallel to the center of the wound cone.

Next, roll the cone on a flat glass plate to fix it with black spots and fix it with tape. Continue to roll and tape it again with black spots.

Next, measure the length between the black dots on both sides of the glass plate. The length at this time is called A.

Next, the tape is removed and straightened to length after 1 minute so that the thread is not tensioned. The length at this time is called B.

Therefore, when the shrinkage ratio is S, it can be expressed as S = (A-B) / A × 100.

If the weight of the cone is 500g or less, sufficient dissociability to the polyurethane elastic yarn can be obtained by the conventional method, and if the weight of the cone exceeds 1kg, the excellent dissolvability cannot be obtained only by adjusting the shrinkage ratio. It is preferable that the cone of silver 500g-1kg is employ | adopted, and it is preferable at this time that the externalizing speed with respect to a polyurethane elastic yarn shall be 500-1,000 m / min.

Shrinkage of less than 7% required in the present invention is possible by adjusting the speed between two to three rollers, which is usually passed before winding the polyurethane elastic yarn to the cone. This can be controlled by making the speed of the winder shear roller slightly larger than the speed of the winder so that the stretched polyurethane elastic yarn is rapidly contracted and wound during winding. That is, according to this method, although the shrinkage rate of the polyurethane elastic yarn is low, the shrinkage present in the polyurethane elastic yarn can be maintained as it is due to rapid shrinkage, thereby making it possible to produce a winding body having a low shrinkage rate without collapse of the four layers.

In general, the winder shear roller of the normal spinning roller is operated at the same or lower speed than the winder, in this case, the shrinkage rate is large, the problem of deterioration occurs, the speed of the winder shear roller is the speed of the winder In much larger cases, the shrinkage of the yarn is significantly smaller, but the deflection of the polyurethane elastic yarn occurs between the winder shear roller and the winder, causing trimming and pulverization. Therefore, in order to obtain a large sized winding body with an appropriate shrinkage ratio, the winder shear roller speed must not be lower than the winder speed, and the winder shear roller speed must not be significantly greater than the winder speed, The winder shear rollers should be slightly faster.

The speed control of the roller is the speed (V) of the first roller (1) to be wound around the spinning yarn based on the speed (V ₃ ) of the winder (3) assuming that the polyurethane elastic yarns are wound as shown in FIG. It can achieve by maintaining the ratio of ₁ ) and the speed V ₂ of the second roller 2 in a constant relationship. This relationship is the same as the following equation (1) and (2).

<Relationship 1>

0.95V ₃ ≤V ₁ ≤1.05V ₃

<Relationship 2>

0.5 V ₃ + V ₁ ≤ V ₂ ≤ 0.15 V ₃ + V ₁

The dissolvability shown in the following examples measured on the wound body in which the polyurethane elastic yarn was wound by the method according to the present invention used a disintegration measuring instrument as shown in FIG. Maritime determinants were determined by tension and trimming.

In general, when 40 denier of polyurethane elastic yarn is measured by the nautical seameasurement measuring device, trimming phenomenon occurs when the sea power exceeds 40 gf. It becomes bad.

The nautical resolution results for the embodiments can be obtained by performing the following procedure.

First, the cone of the elastic fiber placed on the drive roller (b) is rotated at a speed of 50 meters per minute, and the speed of the roller (d) that is externally wound is set to 150 meters per minute.

Second, the tension value shown in the tension meter (e) was measured at this time, and the roller (c) is driven at the same speed as the roller (b).

Third, by removing part of the outer layer of the cone before nautical metric measurement, the tension deviation occurring in the outermost layer is minimized.

Fourth, run for about 10 minutes and measure the tension.

Fifth, the inner layer is measured after removing about two thirds of the total amount from the outer layer of the cone after the outer layer measurement of the polyurethane elastic yarn wound.

<Example>

1.7 mole of 4,4'-dimethylene isocyanate was added to a 1 mole solution of polytetraethylene ether glycol having a molecular weight of 1950 and polymerized in a nitrogen gas atmosphere at 90 占 폚 for 60 minutes to prepare a prepolymer. The prepolymer was dissolved in a dimethylacetamide solution and cooled to a temperature of 5 ° C., followed by 1 mole of ethylenediamine as a linear amine, 0.9 mole of 1,2-propylenediamine as a chain growth agent, and meta styrene as a cyclic amine. A chain growth agent solution in which 0.1 mol of diamine and 0.1 mol of 1,4-cyclohexanediamine were dissolved in dimetalacetamide at a concentration of 35% was gradually added to the prepolymer to obtain a polymer having a viscosity of 2,800 poise.

A solution obtained by dissolving 0.2 mol of isopropylamine in 30% concentration in dimethylacetamide was gradually added to the polymer to obtain a polymer having a viscosity of 2,500 poise at 40 ° C, at which time the polymer solid content was 34%.

This polymer was wound up by producing a 40 denier polyurethane elastic yarn using a conventional dry spinning method. At this time the emulsion content of 8%, and the speed (V ₁₎ of the first roller (1) it was as 600m / min, both the speed (V ₂₎ of the second roller 2 is movable further wine 690m / min ( The speed (V ₃ ) of ₃ ) is 600 m / min to make a wound body by winding a polyurethane elastic yarn in the cone so that the volume is 800 g, and the resolution of the polyurethane elastic yarn wound around this winding body is as described above. It was measured through a nautical nautical apparatus and a measuring method and the results are shown in Table 1.

Comparative Example 1

Except having wound the polyurethane elastic yarn so that the winding amount is 1kg, it was carried out in the same manner as in Example 1 to measure the maritime properties and the results are shown in Table 1.

Comparative Example 2

The maritime properties were measured in the same manner as in Example 1 except that the speed V ₁ of the first roller 1 was 540 m / min, and the speed V ₂ of the second roller ₂ was 580 m / min. The results are shown in Table 1.

Comparative Example 3

The speed V ₁ of the first roller 1 is 550 m / min, the speed V ₂ of the second roller ₂ is 580 m / min, except that the polyurethane elastic yarn is wound so that the volume is 400 g. In the same manner as in Example 1, the degradability was measured, and the results are shown in Table 1.

Comparative Example 4

The speed (V ₃₎ of the speed (V ₂₎ of the speed (V ₁₎ of the first roller (1) to 860m / min, and the second roller (2) to 980m / min and the winder (3) 900m Except having made it into / min, it carried out similarly to Example 1, and measured the maritime property, and the result is shown in Table 1.

Comparative Example 5

The maritime properties were measured in the same manner as in Example 1 except that the speed V ₁ of the first roller 1 was 600 m / min, and the speed V ₂ of the second roller ₂ was 1100 m / min. The results are shown in Table 1.

Maritime power (gf) Export rate (%) Outer layer Inner layer Example 10 13 2 Comparative Example 1 10 14 2.5 Comparative Example 2 15 envoy 25 Comparative Example 3 14 16 20 Comparative Example 4 11 13 3 Comparative Example 5 Envoy and trimming during operation -

As can be seen from Table 1, in the case of the winder shear roller of the spinning roller is operated at the same or lower speed than the winder, the shrinkage rate is large, the resolution is worsened, the speed of the winder shear roller is much higher than the speed of the winder In the large case, the shrinkage of the yarn is significantly smaller, but the deflection of the polyurethane elastic yarn occurs between the winder shear roller and the winder. When the speed of the winder shear roller is slightly higher than the winder speed, the shrinkage rate is increased. It was found that the lowest and excellent maritime properties. In this case, the maritime properties were excellent even if the volume was large.

According to the manufacturing method of the polyurethane elastic yarn winding body according to the present invention configured as described above, by adjusting the speed of the winder shear spinning rollers properly to maintain a constant shrinkage rate when the polyurethane elastic yarn winding, By making it possible to significantly improve the properties it is possible to avoid frequent replacement of the cone during the sea, it is possible to improve the productivity in the fabric manufacturing.

Claims (1)

Polyurethane elastic yarn winding body manufacture which draws polyurethane elastic yarn of 40 denier or less from spinneret and winds it to the cone installed in a winder through two spinning rollers so that the winding amount is 500g-1kg and the winding width is 50mm or less As a method, When the speed of the winder is V ₃ , the speed of the first spin roller is V ₁ , and the speed of the second roller is V ₂ , the speeds are 0.95V ₃ ≤V ₁ ≤1.05V ₃ and 0.5V ₃ + V ₁ ≤V is determined by the relation of ₂ ≤ 0.15V ₃ + V _1, Polyurethane elastic yarn winding production method characterized in that the shrinkage of the polyurethane elastic yarn is not greater than 7%.