KR930010788B1 - Method for preparation of polyester complex twisting yarn - Google Patents

Abstract

interlacing the highly- oriented undrawn polyester filament yarn with the drawn polyester yarn at before the input of the false-twisting heater or after the untwisting zone with the interlacing number of 20-100 ea./m under the condition that the birefringence ( n) of the highly oriented yarn, the temperature (Pt) to generate maximum heat- stress of the drawn yarn, and the temperature (Ht) of the false- twisting heater satisfy the equation (1)-(2); and blending, twisting. The composite yarn made by this method shows the bulkiness, warmth like wool, as well as mild luster and soft surface touch like natural silk.

Description

Manufacturing method of polyester composite twisted yarn

The present invention relates to a process for producing a polyester composite twisted yarn of silk-wool having good process passability and simultaneously expressing wooly volume and warm feeling as well as silky gloss and soft surface feel on a knitted fabric.

Woven fabrics made of general twisted yarn have good volume and warm feeling, but the drawback has been pointed out that the surface feel is not smooth, uneven and gloss.

In order to improve the flaw of the false twisted yarn, the conventional techniques proposed include a method of manufacturing a crimped yarn and a non-crimped yarn into an air jet mixed yarn to produce a pleated composite yarn (Japanese Patent Application Laid-Open No. 49-72442). There are methods to make a deep-sea composite yarn with loops and relaxation parts on the surface by non-crimped yarns and by using a torque force or by plying (Japanese Patent Application No. 47-23349) or by air jet blending (Japanese Patent Application No. 61-20661). .

However, the blended yarns produced in this way have poor blending conditions due to uneven blending conditions and snarls and loops on the surface.In addition, the surfaces of the knitted fabrics are fixed or hardened by heat during the post processing. Because of this roughness, silky smooth surface feel and appearance (gloss) cannot be expected.

In addition, a method of manufacturing a superficial composite yarn in which the non-crimped filament yarn is oversupplied than the crimped yarn and intermixed with the air jet, and the crimped yarn is arranged at the core and the non-crimped filament yarn at the beginning is used. Because it is composed of non-crimped filament yarn, it has a strong feeling of coldness, and due to many loops, process passability is poor, and the surface of the knitted fabric becomes rough for the same reason, so silky smooth surface feel and appearance cannot be expected.

On the other hand, di-shrink blended yarn mixed with two kinds of stretched yarns having different thermal shrinkage rates to express moderate volume with silky gloss and smooth surface feel is widely used.

The bi-shrink blended yarn is smooth in surface and has good luster but blends non-crimped filaments, so there is no substantial crimp and no cross section like crimped yarn in filaments, so it lacks volume and the gloss is close to cold metallic luster. Volume and warmth are virtually impossible to express.

The present inventors have diligently studied to overcome the drawbacks of the prior art and to provide a method for producing a processed yarn that gives silky gloss and a smooth surface feel while giving excellent volume and warm feeling like wool. Alternatively, the present invention leads to a completely different invention from the conventional method of mixing two non-crimped yarns having different shrinkage rates.

The present invention focuses on the fact that the false twisted yarn twisted with high orientation undrawn yarn spun at a speed of 4,500 m / min or more exhibits a similar crimpability to that of the twisted twisted yarn under the same conditions, but with less cross-sectional deformation. In blending high-orientated yarns and drawn-in yarns, they are entangled before or after the introduction of the combustible heater to impart morphological stability and focusing properties. By setting the combustion temperature at which cross-sectional deformation of the filaments constituting the unstretched yarn occurs as little as possible than the filaments constituting the stretched yarn, the manufactured composite twisted yarn has a good process passability as well as wool-like volume, warmth, and silk and liver. It produces a soft gloss and smooth surface effect.

That is, the present invention is a entanglement treatment of high orientation unoriented polyester filament yarn (hereinafter referred to as high orientation yarn) and polyester drawn yarn (hereinafter drawn yarn) radiated at a spinning speed of 4,500 m / min or more before or after the introduction of the combustion heater When the mixed fiber is combustible, when the birefringence of the highly oriented birefringence is Δn, the maximum thermal stress expression temperature of the stretched yarn is Pt, and the burner heater temperature is Ht, they satisfy the following relations (1) to (2) simultaneously. It is a manufacturing method of polyester composite twisted yarn.

Hereinafter, the present invention will be described in detail.

In the present invention, as the starting yarn, highly oriented unoriented polyester filament yarn (hereinafter referred to as high orientation yarn) and polyester drawn yarn (hereinafter drawn yarn) radiated at a spinning speed of 4,500 m / min or more are used.

When high orientation yarns or unstretched yarns spun with twisted yarns spun at less than 4,500 m / min, the running stability of the blended yarns is unstable, and the composite twisted yarns are easy to form an unstable two-layer structure. The cross-sectional deformation of the undrawn yarn is worse than that of the drawn yarn, so that the object of the present invention cannot be achieved at all. The use of the highly oriented yarn spun at a speed of 5,000 m / min or more can more effectively achieve the object of the present invention.

In the present invention, the term "stretched yarn" includes a general stretched yarn having an elongation of 25 to 45% and a low magnification drawn yarn having an elongation of 45 to 80%. The effect of the present invention can be expressed in various ways according to stretching conditions. have.

For example, the heat treatment at low temperature during stretching can further set the burner heater temperature of the present invention to further emphasize the silky gloss and feel, and when using a low magnification stretched yarn including a partial unstretched portion, a mixed color effect is obtained. It can be added to give the appearance of spun silk.

In addition, when the birefringence of the high-orientation yarn is Δn and the maximum thermal stress expression temperature of the drawn yarn is Pt, they must satisfy a relational expression such as Pt ≦ Δn × 1000 + 80, but when Pt ≦ Δn × 1000 + 70, The effect can be more surely achieved.

In the case of using a high orientation yarn and a stretched yarn that do not satisfy such a relationship, the silk-wool composite effect of the present invention is impossible even if the temperature of the combustible heater is set.

The present invention is completed by interlacing such highly oriented yarns and drawn yarns before or after the introduction of the burner heater or after the sea area.

In order to obtain the morphological stability and uniformity of mixed island combustible yarns, entanglement treatment should be carried out before the introduction of combustible heaters or after the sea area.

That is, entangled mixed islands by attaching entanglement devices at appropriate positions before the combustible heaters in a continuous process, or entangled mixed islands by attaching entangled devices after the Haeyeon station (ga research ~ winding rollers), or entangled yarns which have been previously entangled in a separation process. It may be flammable.

It is preferable that the number of entanglements after the entanglement treatment is 20 to 100 / m, but when the number of entanglements is less than 20 / m, the convergence of the blended yarn is bad. , Entanglement, etc. occur, which is not preferable.

In the present invention, the temperature of the combustible heater (hereinafter referred to as Ht) should be set so as to satisfy the range of-(0.02 * Pt) ³ + 0.0076 * Pt ² -0.9 * Pt + 145 ≦ Ht ≦ Δn × 1000 + 100. This temperature range is intended to produce the composite twisted yarn of the silk-wool yarn to which the present invention is directed by giving effective crimping properties to both high-oriented yarns and drawn yarns, while allowing the cross-sectional deformation of the high-oriented yarns to proceed as little as possible.

If Ht is lower than-(0.02 * Pt) ³ + 0.0076 * Pt ² -0.9 * Pt + 145, the running stability of the false-twist yarn is poor, so the cutting is frequent and the workability is very low, which can give effective crimp to the stretched yarn. None meets the object of the present invention.

In addition, when Ht is higher than Δn × 1000 + 100, the crimping property of the composite yarn is good, but the cross-sectional deformation of the high-orientation yarn becomes large, and the composite yarn is similar to that of ordinary false twisted yarn, and thus the object of the present invention cannot be achieved.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples.

<Example 1>

Polyester highly oriented unstretched yarn (50D / 36F, Δn = 0.108) and polyester stretched yarn (50D / 24F, maximum thermal stress expression temperature of 154 ℃) spun at 6,000m / min in the middle of feed roller and combustible heater Using a combustor equipped with an interlaced nozzle, the combustion heater temperature is 160 under combustible conditions of 80 interlocking nozzles / m (measured in mixed fiber twisted yarn), spindle speed 250,000 RPM, combustible water Z 3125TPM, and overfeed rate of -1%. Each composite twisted yarn manufactured by blending and twisting at a temperature of 150 ° C. was set at a density of 150 bones / in, and a polyester 75D / 72f twisted yarn (2,800TPM) was used as a weft s: z = 2: 2, and 72 bones / in. After weaving the plain fabric, the plain fabric was dyed by a conventional method.

The characteristics and dyeing results of the composite twisted yarns prepared by heater temperature are shown in Table 1.

The crimping recovery rate is 15 minutes after the sample is treated in 90 ℃ hot water under no tension, dried at room temperature for 1 day, dried and put in a mass cylinder containing 20 ± 2 ℃ distilled water under a load of 0.1g / d. ) Was measured, and the load was changed to 0.01 g / d, and reinserted to obtain a crimp recovery ratio = {(Lo-L ₁ ) / Lo} × 100 (%) from the length (L ₁ ) measured after 3 minutes.

The cross-sectional deformation degree was made by observing the cross-section of the blended twisted twisted yarn prepared under the microscope and the one with the most severe cross-sectional deformation was 1, and the smallest was 5.

Example 2-3, Comparative Example 1-2

In the same manner as in Example 1, but the flammable heater temperature was as shown in Table 1.

The method of the present invention [Example 1-3] is not only good workability such as flammability workability and weaving of manufactured composite yarn, but also processed composite twisted yarn has a rich crimp recovery rate, but also cross-sectional deformation of high orientation yarn constituting composite twisted yarn. The province was much lower than the drawer. As a result, the dyed processing paper applying the composite twisted yarn prepared by the method of the present invention was a silk-wool fabric giving a silky appearance, wool-like volume, and a warm feeling.

When the burner heater temperature was 140 ° C (Comparative Example 1), cutting occurred frequently during combustion, weaving was also very poor, and the appearance and feel of the dyed fabric were forged. In addition, when the heater temperature was 220 ° C (Comparative Example 2), both flammability and weaving were good, but the cross-sectional strain was similar, and the appearance of the processed paper was similar to that of the simple twisted yarn fabric.

Example 4

Polyester's highly oriented unstretched yarn (50D / 36F, Δn = 0.082) and polyester stretched yarn (50D / 24F, maximum thermal stress expression temperature 103 ℃) spun at a speed of 4,750m / min. , The other conditions were the same as in Example 1 to prepare a composite twisted yarn.

The composite twisted yarn thus prepared was manufactured in the same manner as in Example 1, and subjected to normal dyeing processing.

Both flammability and weaving were good, and the dyed paper was a silk-wool fabric with an elegant luster like silk and a good volume like wool. Table 1 shows the cross-sectional strain, crimp recovery, and the like measured in the same manner as in Example 1.

Comparative Example 3-4

50D / 24F polyester stretched yarn having a high orientation yarn and a maximum thermal stress expression temperature of 204 ° C. as in Example 4 was mixed with each other under the same conditions as in Example 4, but a composite twisted yarn was prepared using a combustion temperature of 150 ° C. and 220 ° C. The same fabrics as in Example 1 were prepared by applying the blended yarns prepared at the respective temperatures, and subjected to normal dyeing, and the results are shown in Table 1 below.

Example 5

50D / 36F polyester part and non-stretched yarn having a maximum thermal stress expression temperature of 75 ° C. and an elongation of 68% as in Example 1 were set to a flammable temperature of 170 ° C., and other manufacturing conditions were obtained in Examples. In the same manner as in 1 to prepare a composite twisted yarn and a low-cost fabric and the results are also shown in Table 1.

TABLE 1

※ Silk gloss + color mixing

Claims (2)

In blending the highly oriented unstretched polyester filament yarn and the polyester stretched yarn before or after the introduction of the flammable heater or after the sea area, the birefringence of the highly oriented yarn is Δn, and the maximum thermal stress expression temperature of the stretched yarn is Pt and the burner heater. A method for producing a polyester composite twisted yarn, wherein when the temperature is referred to as Ht, they satisfy the following formulas (1) to (2) simultaneously. The method for producing a polyester composite twisted yarn according to claim 1, wherein the entanglement treatment is 20 to 100 / m.