KR910000054B1 - The manufacturing method of theroplastic polyester synthetic fiber - Google Patents

Abstract

The composite garn is made by two stages. The first stage comprises false twisting a crimped multi-filament and uncrimped multi- filament yarn. The second stage comprises interlacing the false twisted yarn by fluid injection method. During the first stage, heating temp. of the first heater in first false twisting process is set at 180-220 deg. C, while that of the second heater in second false twisting process at 150-200 deg.C. By setting heating temp. as above, a crimped yarn is obtained. Then the crimped and uncrimped yarn are doubled. The targeted polyester thermoplastic composite yarn is made by fluid injection interlacing treatment of the above mentioned doubled yarn.

Description

Manufacturing method of polyester thermoplastic synthetic yarn

The figure is a schematic diagram showing the process of the present invention.

* Explanation of symbols for main parts of the drawings

1: Multifilament yarn made of combustible yarn 2: 1st roller

3: first heater 4: flammable part

5: 2nd roller 6: 2nd heater

7: 3rd roller 8: 4th roller

9: haphazard guide 10: fluid injection device

11: 5th roller 12: winding device

A: Combustible thermoplastic synthetic fiber multifilament yarn

B: non-crimped multifilament yarn

The present invention uniformly mixes crimped (ie, flammable) synthetic fiber twisted yarn with no crimped multifilament yarn to make flexible spinning in the fabric or knitted fabric state by using the shrinkage difference and the crimp difference between the two threads. The present invention relates to an improved method for producing a synthetic fiber composite yarn that provides the effect of yarn threading but is superior in weaving or knitting processability.

Conventionally, a method of blending synthetic fiber crimped yarns and non-crimped yarns by using a fluid or static electricity has been proposed. In particular, a blending technology using a fluid has the advantage of being capable of high-speed processing in a simple process. In the case of composites without crimped wheels, when the fabric or knitted fabric was made, there was no flexible touch of the spun yarn or the shrinkage and crimping gap between the two yarns were so large that loops occurred on the surface of the yarn. In the latter case, there was a problem in that the dissolution property was poor, and defects on the NAP occurred due to the rolling of the thread during the weaving or knitting process, or the trimming occurred, resulting in a decrease in productivity and quality.

In addition, Japanese Patent Application Laid-Open No. 55-163229, which is a false twisted or semi-stranded yarn of thermoplastic synthetic fibers and is subjected to a false twist so that the heat setting temperature is set to a secondary transition point of ± 30 ° C. when performing false twist processing. To make the high shrinkage crimp yarn with a boiling water shrinkage of 10% or more, and then perform fluid entanglement treatment with filament yarn, crimped yarn, or spun yarn as a continuous or separate process, and heat treatment continuously or in the state of knitted fabric. A method of manufacturing a SPUN LIKE processed yarn, which is characterized in that it is characterized in that it is characterized in that the heat treatment to the dry heat heater after the fluid bonding treatment in the electricity is disclosed, but according to such a method to obtain a high shrinkage crimp The fixing temperature of the twist by the first heater is ± 30 ° C at the second transition point of the polyester fiber (typically 70 ° C). Because of the heating, the twist cannot be completely fixed at this time, so that many or severe LOOPs are generated. As a result, even if the yarn is combined with other yarns and subjected to the normal flammability treatment by the second heater, the composite yarns produced are severe loops. (See figure 2 in the open publication of Japanese Patent Laid-Open No. 55-163229). Unfavorable shortcomings arise in fabrics and knitted fabrics made from yarns produced in this way.

That is, in this case, since the heating temperature by the first heater is less than or equal to the crystallization temperature of the polyester fiber, the heat setting effect is not sufficiently exhibited, even if the normal false twist treatment by the second heater is performed. Even if process engineer B is supplied between the second heater, that is, between the combustor 4 and the second heater 6, is intertwined with the combustible multifilament yarn A, and the heat treatment is performed in the second heater, the shrinkage effect of yarn A and B appears in the actual state. It becomes looped and has poor maritime properties. In the process of weaving or knitting, there is a problem in that NEP flaws occur on the surface of the fabric or knitted fabric or trimming occurs due to the roll of the yarn.

(The heating temperature by the first heater is more than the crystallization temperature of the polyester fiber, especially considering the productivity, 180-220 ℃ is preferred, but the heating temperature of the first heater of Japanese Patent Laid-Open No. 55-163229 described above is polyester Since the second transition point of the fiber to 70 ℃ ± 30 ℃ to cause the same problem as above.)

The present invention is capable of high efficiency and high quality processing in the weaving or knitting process by eliminating the above-mentioned drawbacks, and the synthetic fiber composite which can exhibit excellent resilience while having a soft spinning yarn feel when manufactured by woven or knitted fabric. It is an object of the present invention to provide an improved manufacturing method.

In order to achieve the above object, the present invention provides a false twist in an appropriate condition in a twist twist apparatus by twisting-heat fixing (heating temperature by the first heater is 180-220 ° C) -decompression. The composite thermoplastic fiber multifilament yarn " A " and the non-crimped multifilament yarn " B "

Referring to the manufacturing method of the present invention in detail as follows. The drawings schematically show an implementation process of the method of manufacturing a synthetic fiber composite yarn according to the present invention.

In the embodiment, the yarn 1 is a first stage false twist mechanism consisting of a first roller 2, a first heater 3, a twist spindle 4, and a second roller 5, and a first stage combustion. The treated thread is treated with a second stage combustor consisting of a second roller 5, a second heater 6, and a third roller 7 to form a highly shrinkable crimp.

(At this time, the temperature of the first heater is more than the crystallization temperature of the polyester fiber, especially considering the productivity 180-220 ℃ is preferred.

When the first heater temperature is lower than the crystallization temperature, the heat setting effect is hardly exhibited, and thus the crimp of the target twisted yarn cannot be obtained, and when the temperature reaches 220 ° C. or higher, the heat setting effect is excessive and fusion occurs.

Here, it is preferable that the temperature of the second heater is 150-220 ° C., and the surface speed of the second roller 5 is set to an overfeed rate of less than 10% relative to the surface speed of the third roller 7.

If the temperature of the second heater is 200 ° C or higher or the overfeed rate between the second roller 5 and the third roller 7 is 10% or more, the set effect is excessive and the non-shrinkage rate of the combustible multifilament yarn falls to 15% or less. Since there is no difference with the ratio of non-shrinkage of the fabric, if the fabric or knitted fabric is manufactured using the composite yarn thus manufactured, the effect of the desired soft spinning yarn cannot be obtained.

In addition, when the temperature of the second heater 6 is less than 150 ° C. and the overfeed rate between the second roller 5 and the third roller 7 is close to 0%, the meaning of the second heater becomes practically meaningless. ), A simple mechanical structure without the third roller 7 can be adopted.

In this case, since the physical properties of the heating multifilament are determined by the first roller 2, the first heater 3, the twist spindle 4, and the second roller 5, the temperature of the first heater and the number of twists It should be adjusted so that the non-aqueous shrinkage ratio of the combustible multifilament yarn obtained in consideration of the above is 40%, more preferably 35% or less.

If the non-shrinkage rate of the combustible multifilament yarn exceeds 40%, the postprocessability of the composite yarn obtained by the non-crimped yarn, the shrinkage difference and the crimp difference becomes too large, and the two-layer structure due to the shrinkage difference between the two yarns when the fabric or knitted fabric is manufactured Too large will result in a lack of resilience of the resulting fabric or knitted fabric.

In addition, when the non-shrinkage rate of yarn A is less than 15% or the non-shrinkage rate of yarn B is larger than 10%, the difference in shrinkage ratio between both becomes small, and thus the flexible touch of the spinning yarn intended in the present invention cannot be exhibited.

On the other hand, the non-crimped multifilament yarn "B" is combined from the twisted synthetic fiber multifilament yarn "A" supplied from the fourth roller 8 and supplied from the third roller 7 at the weaving guide 9 and then fluidized. It enters the injection apparatus 10 and is entangled and wound by the winding apparatus 12 via the 5th roller 11. At this time, if the process yarn B is supplied to the previous stage of the second heater, that is, between the combustor 4 and the second heater 6, as described in Japanese Patent Application Laid-Open No. 55-163229, the combustible multifilament yarn "A" and In case of entanglement and heat treatment in the second heater, the shrinkage effect of thread A and B is shown in the real state, so it is looped and many or severe loops are formed, so that the maritime properties are poor, and it is kneaded by the outdoor jungle during the weaving or knitting process. ), Defects on trimming or trimming may occur, resulting in a decrease in productivity and quality.

In the present invention, the degree of entanglement provided by the fluid injection device 10 is preferably 20-60 pieces / m.

When the degree of entanglement is less than 20 / m, the intermixing condition is poor, leading to deterioration in sealife and deterioration in productivity and quality, such as cutting and crushing during weaving or knitting process. Conversely, when the degree of entanglement exceeds 60 / m, as in the case of Japanese Patent Laid-Open No. 55-163229, the entanglement is excessive and the strength of the entanglement is so strong that the entanglement is not released in the weaving or knitting and dyeing process and the final fabric or knitting It remains a flaw in the award.

On the other hand, at the time of entanglement with the fluid injection device 10, the high-speed fluid should be injected in the vertical direction of the seal. When the high-speed fluid is injected in a direction parallel to the yarn, loopability is likely to occur, resulting in poor weaving or knitting processability of the composite yarn.

The manufacturing process of the present invention is limited to a method of twisting a thermoplastic synthetic fiber multifilament yarn "A" such as polyester fiber and subsequently entanglement with the non-crimped multifilament yarn "B" as described above. It is also possible to make a thermoplastic synthetic fiber multifilament yarn "A" which has been burned once and then entangle with the non-crimped multifilament yarn "B" in a separate process.

However, manufacturing in a single process, such as the former, is more advantageous in terms of production cost.

In the manufacturing method of the synthetic fiber composite yarn of the present invention, any of the thermoplastic synthetic fiber multifilament yarn "A" which is combustible can be used as long as it is a multifilament yarn of a thermoplastic synthetic fiber such as polyester, and even the drawn yarn of the thermoplastic synthetic fiber can be used. It is also possible to use a highly oriented unburned gentleman having a good orientation of 20 × 10 ⁻³ 70 × 10 ⁻³ .

In the case of using a highly oriented undrawn yarn of thermoplastic synthetic fibers, it is natural that it must be combusted at the same time as the drawing apparatus in the drawing. As the non-crimped multifilament yarn "B", thermoplastic synthetic fibers such as polyester or any kind of fibers having a specific water shrinkage of 0-10% in acetate or cellulose can be used.

The chemical fiber composite yarn obtained by the above method has good sea repellency, weaving or knitting processability, and can exhibit both excellent resilience and soft effect of spun yarn when made of woven fabric or knitted fabric.

In the above description, the non-aqueous shrinkage rate is checked as follows.

[Non-shrinkage rate]

과 같은 식이 성립된다.Wind the thread of sample and fix one end to scale plate, load the other end with load (2 times of De) and mark the length (l) and then process the number and measure the length on scale plate in the same way (l '). As a percentage of the length of the yarn before and after non-water treatment

Equation

Referring to the manufacturing method according to the present invention according to a specific embodiment as follows.

EXAMPLE

Cationic dye salted poly with a birefringence of 55 × 10 ⁻³ polyester high orientation unoriented multifilament yarn 115d / 36f as the supplier of yarn “A” in the process of the drawing and a specific water shrinkage of 8% as yarn “B” It was prepared using the ester multifilament drawn yarn 50d / 24f under the following conditions.

(1) The temperature of the first heater 200 ℃

(2) 2500 TPM twist in the first combustor

3, the stretch ratio in the false twist apparatus of the first ^1.55

(4) 170 degreeC of temperature of the 2nd heater in a 2nd combustible mechanism

(5) Overfeed rate between 2nd roller and 3rd roller 7%

(6) fluid treatment arm 2.5kg / ㎠

Using the composite yarn processed under the above conditions as a light and weft yarn, the result of weaving and dyeing in WJL with twill was as follows.

According to the comparison table, when the conditions of the production method according to the present invention were satisfied, it was confirmed that various physical properties and effects were superior to those of Comparative Examples 1 to 3 deviating from this condition.

Claims (1)

In manufacturing a composite yarn by crimping filament yarns and non-crimping multifilament yarns by a first step of twist twist processing and a second step of fluid injection, a first heater in the first combustor Heating temperature at 180-220 ° C., which was then heated to a temperature of 150-220 ° C. in the second heater of the second combustor to obtain crimp yarn “A”, and this crimp yarn “A” and the non-crimped multifilament yarn Method of manufacturing a thermoplastic composite yarn, such as polyester, characterized in that for carrying out the following known fluid bonding treatment after plying.

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