KR100211218B1 - Process for mixed yarn having different shrinkage - Google Patents

Abstract

The present invention is a method for producing bisulfate blended yarn which is excellent in shrinkage effect and can be manufactured at low cost.

Conventional di-shrink blended yarn was prepared by mixing a copolyester polyester and a conventional polyester yarn, which has a problem that the price is expensive if the di-shrink effect is not sufficiently expressed on the fabric.

The present invention is the first heat treatment at room temperature ~ 70 when twisting after the two or more polyester yarns having a cutting elongation difference of more than 70% after burning, or secondary heat treatment to 150 or more after the flame retarding process is completed. It is a manufacturing method of Isu shrink blended yarn characterized by the rim.

Description

Manufacturing method of Isu shrink blended yarn

The present invention relates to a manufacturing method of di-shrink blended yarn which is excellent in the shrinking effect and does not cause dyeing difference and can be manufactured at a low price. Conventionally, diaxial blended yarn was produced as follows. In other words, the copolymerization of special materials in the polymerization process to suppress the formation of crystals, so that a large number of amorphous regions exist to increase the shrinkage of the yarn to increase the shrinkage of the yarn to 20% or higher shrinkage and normal polymerization and stretching conditions Ordinary yarns having a shrinkage of 8% level were entangled by interlacing or the like, and then applied as warp or weft of the fabric.

However, di-shrink mixed fiber manufactured in this way has a large difference in yarn shrinkage in the yarn state, but when applied to the fabric, the shrinkage stress is weak and sufficient di-shrink effect could not be expressed. Streaky phenomena occurred due to the segregation phenomenon caused by the difference between the car and the unevenness, which adversely affected the quality of the fabric.

In addition, the conventional method has a problem in that the manufacturing cost is increased because the foreign matter to suppress the crystal formation in the synthesis process.

The present invention solves the conventional problems as described above will be described in detail below.

According to the present invention, when two or more polyester filament yarns having a cutting elongation difference of at least 70% are first air-interrupted, the combustible yarns are produced by combusting and decomposing the combustible yarns. The primary heat treatment temperature should be below room temperature or 70 ℃ under the condition of 加 撚. When the secondary heat treatment is performed during the combusting process immediately after the disintegration, or the second heat treatment after manufacturing the false twisted yarn. The secondary heat treatment temperature is 150 ℃ or more temperature is characterized in that the manufacturing method of biaxial blended yarn.

In the present invention, when two or more kinds of yarns having a cutting elongation of 70% or more are flammable, the yarn having a high cutting elongation is surrounded by a yarn having a small cutting elongation due to a difference in elastic recovery rate between the yarn having a high cutting elongation and the yarn having a small cutting elongation. It becomes a combustible (加 撚) while winding up.

In the present invention, when the elongation at break is less than 70%, the elastic recovery rate difference is almost the same, so that the yarn with the high elongation at break is not combustible while winding a small yarn, so that two or more kinds of yarns having a 70% or more elongation at break are used. It is essential. When this type is flammable, the yarn with high cutting elongation is weak in elastic recovery force, so it is difficult to recover to its original length even after dissolution. Since the elastic recovery force is great in the flammable region, the length change does not occur easily even in the surrounding tension, and even if the length change occurs, the length does not change because the length is returned to the original length after the tension is removed.

In addition, in order to combust two or more kinds of costs, it must be entangled before the combustible process. If the primary heat treatment in the combusting process is not necessary, the entanglement process is unnecessary, but when the first heat treatment is not performed, a lot of loops are formed on the yarn, and these loops are caught on the spindle, which makes the work impossible. You must engulf before.

In addition, in the general flamming process, it is common to perform the first heat treatment while flamming, but the present invention is characterized in that the first heat treatment is omitted or the heat treatment is performed at a temperature of 70 ° C. or lower when burning. .

If the primary heat treatment temperature is higher than 70 ℃ when burning, the same as the general method of manufacturing a composite twisted yarn, but the present invention has a significant difference in appearance from the composite twisted yarn because the primary heat treatment is less than 70 ℃ when burning Will be.

That is, the cross section of the yarn is deformed when the first heat treatment exceeds 70 ° C. when burning, but if the first heat treatment is less than 70 ° C. as in the present invention, no cross-sectional deformation of the yarn occurs even after burning. Do not.

Although the flammable processing in the present invention as described above can be carried out in a general combustor, the heater can be more easily worked in a non-contact combustor.

In the present invention, when the first heat treatment is omitted, the flame-retarded yarn is fired, and the yarn having a small cutting elongation hardly changes in length, but the yarn having a large cutting elongation has a large change in cutting elongation. A yarn with a large cutting elongation around the small yarn forms a long loop.

At this time, the yarn with a high cutting elongation exhibits the same effect as the twisting at the time of burning at room temperature, so that the shrinkage of the yarn is considerably high.

As a result, when passing through the secondary heater of the combustor or the subsequent secondary heat treatment process, the yarn with a large cutting elongation shrinks and the loops appearing after demolition are eliminated and shrinkage heat treatment is performed to have the characteristics of low shrinkage. .

On the other hand, since the yarn with a small cutting elongation is relatively smaller than that of the yarn with a large cutting elongation, the shrinkage of the yarn is hardly changed even in the secondary heat treatment after the disintegration.

In the present invention, the second heat treatment temperature after sea smoke should be at least 150 ° C.

If the heat treatment is less than the temperature, the heat treatment effect is insufficient, and the yarn with a large cutting elongation cannot be sufficiently contracted, so that the low shrinkage does not occur, and thus the shrinkage effect cannot be expected. As the secondary heat treatment method, it is preferable to use a contact heater because the contact heater can reliably obtain the heat treatment effect than the non-contact heater.

When the biaxially blended blended yarn prepared by the present invention is applied to a knitted fabric, a yarn having a small cutting elongation is located at the center and a yarn having a large cutting elongation is located at an outer layer, so that a biaxially blended mixed yarn, knitted fabric of a typical two-layer structure can be manufactured. have.

Example 1

Polyester non-stretched yarn with a cutting speed of 3000m / min, spinning at 150% and 80 denier / 36 filament with a spinning elongation, and spinning at a speed of 100m / min. After interlacing with 75 denier / 36 filament drawn yarn, use a combustor to combust at 2200 TPM using a spindle at 50 ° C for the first heater temperature, and heat it at 160 ° C using a secondary heater. Obtained the marriage feast. After weaving and dyeing, weaving and dyeing after 240 TPM by applying the diaxial mixed fiber, the shrinkage rate of 75 denier / 36 filament drawn yarn is 15% and the unstretched 80 denier / 36 filament shrinkage is -2%. It was possible to obtain a biaxial blended yarn fabric having a very good shrinkage effect.

In addition, the shrinkage of 75 denier / 36 filament drawn yarn was 18%, and the shrinkage of unstretched 80 denier / 36 filament was -1%. The bishrinkage effect was very good.

Example 2

After twisting the polyester undrawn yarn 120 denier / 36 filament having the same cutting elongation as Example 1 and the polyester 75 denier / 36 filament yarn having 45% of the cutting elongation produced by the ultra-fast spinning method having a spinning speed of 5500 m / min. Turn off the heater and burn it with 1500TPM at room temperature using a belt-cross spindle, and decompose it and heat-treat it with a non-contact heater at 200 ° C. 14% of dihydric mixed fiber was obtained.

As a result of the application of the above shrinkage blended yarn to a warp, weft or knit fabric of the fabric, a good shrinkage effect was obtained.

Comparative Example 1

100 denier / 48 filament of polyester prestressed yarn with 70% cutting elongation and 50 denier / 24 filament of polyester drawn yarn with 35% cutting elongation In the same conditions as in Example 1 was flammable, heat-treated to prepare a biaxial blended fiber.

The yarns thus prepared were subjected to the same conditions as in Example 1 as the warp of the fabric to give 240TPM, followed by sizing, dyeing, and weaving and dyeing. The shrinkage ratio of 15% was poor in shrinkage effect, and the quality of the fabric was poor due to the streaky phenomenon on the fabric.

Comparative Example 2

After cross-linking the two yarns used in Example 1 using a combustor, the primary heater temperature was 120 ° C, and the flame was decomposed after burning to 2200TPM. The cross-sectional deformation of the yarn was very severe. The yarns with high cut elongation did not shrink and were not suitable for application to warp or knit fabrics.

Claims (1)

After crushing two or more polyester multifilament yarns with a difference in cutting elongation of not less than 70%, and firstly heat-treating and decomposing them at a temperature of room temperature to 70 ° C. in the combustible state during the combusting process, or After the process is completed, the second shrinkage blended yarn manufacturing method characterized in that the secondary heat treatment at a temperature of 150 ℃ or more.