KR20050116506A - A flase-twisted composite yarn, and a process of preparing for the same - Google Patents

Abstract

The present invention relates to a composite twisted yarn and a manufacturing method thereof, the composite twisted yarn of the present invention is a high-strength multifilament (A) is a super yarn and a low-strength multifilament (B) is a composite twist, the crimping rate is 5 to 15% , The cross-sectional variation rate (ΔRR) is 1.5 to 3.2, the glass transition temperature (the point of rapid stress in the thermal stress curve, X) is 83 to 130 ° C, the maximum thermal stress temperature (Y) is 200 to 260 ° C, The linear line R ² is characterized in that 0.9100 ~ 0.9990.

In the present invention, the draw ratio of high elongation multifilament (A) and the low elongation multifilament (B), which is a screening yarn, is set to 1.00 to 1.10 when the composite twisted yarn is manufactured by combusting and heat setting after air entanglement. Heater temperature) is characterized in that for each adjusted to 220 ~ 235 ℃.

The present invention is excellent in bulkiness, drape and lightness in the production of knitted fabrics, expresses a soft and very dry touch.

Description

Composite twisted yarn and its manufacturing method {A flase-twisted composite yarn, and a process of preparing for the same}

The present invention relates to a composite twisted yarn and a method for manufacturing the same, and more particularly, to a composite twisted yarn having excellent bulkiness, drape, lightness, and feel when manufactured in a knitted fabric and a method of manufacturing the same.

Synthetic fiber has excellent mechanical properties and is used in various fields of products including general clothing.

In the field of garment manufacturing, research has been actively conducted to provide synthetic fibers having properties similar to those of natural fibers. In particular, in order to solve this problem, a stretched yarn made of synthetic fibers lacks bulkiness, and thus, a twisted yarn having sufficient bulkiness has been developed by performing twist processing while drawing. Such combustible yarns have not only bulkiness but also dryness, lightness, softness, matting effect, and the like. However, these simple false twisted yarns lose bulkiness because they are woven and woven under tension given the application of knitted fabrics. In particular, drape and softness are reduced by over-axis during post-processing.

Various kinds of processing yarns have been proposed to give a dry feeling to the knitted fabric, and a representative one of them is a fused twisted yarn. For example, Japanese Unexamined Patent Publication No. 50-25065 proposes a fusible twisted yarn having a dry feeling by alternately arranging the unsealed edges and the seamed edges in the fiber axial direction after fused flame. However, such fused false twisted yarns tend to have shortcomings due to severe intervertebral deviation and strong tension at the time of weaving and weaving, which leads to defects. There are many problems that the fairness is lowered due to severe friction with the heater.

Composite false twisted yarn is a long fiber and is widely used as a processing yarn capable of expressing the feel and appearance of spinning yarn. Representative composite twisted yarns are made by composite twisting of multifilament yarns having two or more elongation differences. This composite false twisted yarn exhibits good bulkiness due to the two-layer structure consisting of screening and weaving and erosion, and the weaving yarn is wound around the screening to express the feel and appearance like wool.

Japanese Laid-Open Patent Publication No. 7-126944 and Japanese Laid-Open Patent Publication No. 7-11529 suggest that a composite flame retardant yarn, which is a circular cross section yarn, can be manufactured to produce a soft, bulky, and highly resilient fabric. However, these conventional techniques have a limit in satisfying excellent bulkiness, dryness, lightness, and softness with simple composite twisted yarns.

The object of the present invention is a multi-filament yarns having two kinds of elongation difference, and the composite and twisted yarns are laminated and twisted, and the composite and twisted yarns are multi-layered in a multi-layered structure. To provide a composite twisted yarn that expresses a soft, soft and very dry feeling.

The present invention is a composite twisted yarn that can express a good bulky feeling, drape and lightness and soft and dry touch when manufacturing a woven fabric by combining a multi-filament that is super yarn and a high-strength multi-filament that is a screened yarn in an appropriate multilayer structure. To provide.

In addition, the present invention is also to provide a method for producing the composite twisted yarn.

The composite twisted yarn of the present invention for achieving such a problem is a composite twisted super high-strength multifilament (A) and a low-strength multifilament (B) screening, the crimping rate is 5 to 15%, the cross-sectional variation rate ( ΔRR) is 1.5 to 3.2, the glass transition temperature (the point of rapid stress in the thermal stress curve, X) is 83 to 130 ° C, the maximum thermal stress temperature (Y) is 200 to 260 ° C, and the linear line (R ² ) Is characterized in that the 0.9100 ~ 0.9990.

In addition, the method of manufacturing a composite twisted yarn according to the present invention, when the composite twisted yarn is manufactured by twisting and heat setting the super-high multi-filament (A) and the low-strength multi-filament (B) screening after air interlacing. The draw ratio is 1.00 to 1.10, and the flammable temperature (first heater temperature) is set to 220 to 235 ° C.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

First, the composite twisted yarn of the present invention has a structure in which the high-strength multifilament (A), which is the super yarn, and the low-strength multifilament (B), which is the screening, is composite twisted in a multilayer structure.

It is preferable that the high-strength multifilament (hereinafter referred to as "superfine") has an elongation of 80% or more, and has an elongation difference of 40 to 200% between the superfiber and the low-elongation multifilament (hereinafter referred to as "screening").

If the elongation is less than 80%, it is difficult to express abundant appearance due to insufficient elongation difference with the screening during composite combustion, and fail to form a three-dimensional multilayer structure. However, if the emissivity difference between superficial yarn and screening exceeds 200%, the fusion of fragile physical properties causes severe fusion during combustion, resulting in impaired fairness and deterioration of quality.

The single yarn fineness of the ultra-fine yarn is 0.5 to 3 denier. When the single yarn fineness is less than 0.5 denier, the touch is soft, but the fairness is poor due to the moor or cutting during processing, and the appropriate resilience is not obtained, and the crimping property is also reduced. In addition, it is difficult to obtain a rich texture when the single yarn fineness exceeding 3 deniers.

The single yarn fineness of the screening is most preferably 1.5-7 denier, but when the single yarn fineness is less than 1.5 denier, it is difficult to obtain a fabric having appropriate resilience and drape. It is difficult to obtain a richly textured fabric due to its poor bulkiness.

The weight ratio (composition ratio) of the superfine yarn and the screening in the present invention is most suitably 8: 2 to 4: 6, but if the weight ratio of the superfine yarn is higher than 8: 2, the touch is soft but the repulsive elasticity is deteriorated and the fairness is lowered. In addition, if the weight ratio of the yarn is lower than 4: 6, it is difficult to obtain a sufficient bulky and soft touch fabric.

The composite false twisted yarn of the present invention has a crimp rate of 5 to 15%. Ordinary simple false twisted yarn has a high crimping rate of 15% or more. If the crimping rate is too high, the crimping property is good at post-processing, which causes rapid shrinkage. Due to such rapid shrinkage, wrinkles of the fabric are increased and density between tissues is increased, so a fabric of excellent repulsion and soft touch cannot be obtained.

Since the composite twisted yarn of the present invention was manufactured by using superfine yarn and screening having a high elongation difference, the composite twisted yarn has a difference in cross-sectional variation rate greater than that of ordinary twisted yarn and composite twisted yarn. Specifically, the composite false twisted yarn of the present invention has a cross sectional variation ratio (ΔRR) of 1.5 to 3.2 representing the difference between the lowest cross sectional variation and the highest cross sectional variation ratio.

If the cross-sectional variation ratio (ΔRR) is less than 1.5, the crimping property is insufficient, so that abundant bulkiness and appropriate repulsion and dry touch cannot be obtained. If the cross-sectional variation ratio (ΔRR) exceeds 3.2, the space between the filaments decreases. The bulkiness is lowered, and since the processing is performed under severe conditions, the fairness is lowered.

Figure 2 shows the thermal stress curve of the composite twisted yarn obtained through Example 1. Composite twisted yarn of the present invention is the glass transition temperature (X), that is, the temperature of the X point showing a sudden stress in the thermal stress curve of Figure 2, is 83 ~ 130 ℃, the maximum thermal stress temperature, that is, the thermal stress of Figure 2 The temperature at the point Y indicating the temperature is 200 to 260 ° C. If the glass transition temperature is lower than the above range, since the shaft is generated at a low temperature during the post-processing, an irregular shaft may occur, and thus a fabric of stable quality may not be obtained. In addition, since the maximum thermal stress temperature is high, some axis occurs in the heat setting process, and thus a fabric having excellent resilience can be obtained.

FIG. 3 is a graph of linear regression of the curve between the glass transition temperature (X) and the maximum thermal stress temperature (Y) in the thermal stress curve of FIG. ² , thereby calculating the linearity (R ² ). As shown in Fig. 3, the composite twisted yarn of the present invention forms a straight line from the glass transition temperature, the temperature at which stress starts, to the temperature showing the maximum thermal stress, and gradually increases the stress. In this case, stable shrinkage occurs at any process and at any temperature, so that fabrics of excellent quality can be obtained. The composite twisted yarn of the present invention has a linear line (R ² ) calculated as described above is 0.9100 ~ 0.9990.

1 is a simplified process diagram showing an example of a method of manufacturing a composite twisted yarn of the present invention. Composite twisted yarn of the present invention after air-interacting between the high feed multi-filament yarn (A) and low elongation multi-filament yarn (B) between the first feed roller (1) and the second feed roller (3) as shown in FIG. Combined combustion between the second feed roller 3 and the third feed roller 6, and after the heat setting in the hollow heater 7 attached between the third feed roller 6 and the fourth feed roller (8) It can be produced by the method of taking.

If air is mixed before compound combustion, if compound combustion is performed without air interlocking, the two types of yarns are separated to form a multi-layer structure, and stress is concentrated on the yarn that is weak in physical properties, resulting in cutting and mooring, resulting in poor fairness. do. The maximum number of air entanglements is 35 to 100 per meter, and when the number of air entanglements is less than 35, the combined power of supernatant and screening is reduced, which impairs fairness. The lack of bulkiness falls. Combustion is performed after air entanglement.In order to obtain excellent bulkiness, softness, dripness and proper crimping property, the draw ratio is 1.00 ~ 1.10 at the time of combusting treatment, and the combustion temperature (first heater temperature) is 220 ~. It should be 235 ° C.

If the draw ratio is higher than the above condition, the fairness is lowered and the quality of the composite twisted yarn is lowered. If the burnt treatment is performed at a temperature lower than the burned temperature, the bulkiness is lowered and sufficient dry touch and crimping are not obtained. When the flame treatment is performed at the temperature, the fusion of the superfiber occurs rapidly, the touch becomes hard, the bulkiness is deteriorated, the quality of the fabric is degraded, and the process stability is sharply decreased during the processing.

Since the composite twisted yarn of the multi-layered structure of the present invention has crimps, when applied to a knitted fabric, repulsion and dry touch can be obtained. In order to maximize this effect, it is also desirable that a part of the yarn is fused to a part of the yarn. If this exists, the convergence becomes stronger, and when it is made into a knitted fabric, it becomes possible to express strongly the repulsion feeling and dry touch. The degree of fusion is preferably limited to only a part of the yarn, and if fusion occurs excessively, voids between the filaments will disappear.

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

However, the present invention is not limited by the following examples.

Example 1

A polyester with an intrinsic viscosity of 0.62 is melt-spun in a conventional manner to obtain a highly elongated polyester multifilament of 150 denier / 72 filaments of 130% elongation and a low elongation polyester multifilament of 80 denier / 24 filaments of 35% elongation. Prepared. Next, composite flammability was performed in the composite combustor stage of FIG. 1 by using a high-strength polyester multifilament prepared as described above as a yarn and a low-strength polyester multifilament as a screening. Specifically, the high-strength polyester multifilament and the low-strength polyester multifilament are air-interposed between the first feed roller and the second feed roller, and combusted in the second feed roller and the third feed roller, and the third feed roller. After the heat setting in the fourth feed roller and wound. At this time, the flammable temperature was set at 227 ℃, the draw ratio was 1.04, the flammable water was set at 2,066T / M, and the thermal setting temperature was set at 190 ℃. The composite twisted yarn thus obtained was twisted at 1,000 T / M, and then a plain fabric having a warp density of 68 yarns / inch and a weft density of 56 yarns / inch was woven. The plain fabric is S and Z lead is arranged in 2: 2. Next, the plain fabric was post-processed under normal conditions to prepare a final processed paper. The reduction rate was 15%. The results of evaluating various properties (characteristics) of the manufactured composite twisted yarn and processed paper are shown in Table 1.

Example 2

Composite twisted yarns and finished papers were prepared in the same manner as in Example 1, except that high tensile polyester multifilaments of 150 denier / 72 filaments having 160% elongation at the time of composite twist were used. The results of evaluating various physical properties of the manufactured composite twisted yarn and processed paper are shown in Table 1.

Example 3

Composite twisted yarn and finished paper were prepared in the same manner as in Example 1, except that high tensile polyester multifilament of 150 denier / 72 filaments having an elongation of 105% was used. The results of evaluating various physical properties of the manufactured composite twisted yarn and processed paper are shown in Table 1.

Example 4

The composite twisted yarn and the final processed paper were prepared in the same manner as in Example 1 except that the combustion temperature was set at 233 ° C. The results of evaluating various physical properties of the manufactured composite twisted yarn and processed paper are shown in Table 1.

Example 5

The composite twisted yarn and the final processed paper were manufactured in the same manner as in Example 1 except that the draw ratio of the composite twist was 1.08. The results of evaluating various physical properties of the manufactured composite twisted yarn and processed paper are shown in Table 1.

Comparative Example 1

The composite twisted yarn and the final processed paper were manufactured in the same manner as in Example 1 except that the combustion temperature was set at 241 ° C. The results of evaluating various physical properties of the manufactured composite twisted yarn and processed paper are shown in Table 1.

Comparative Example 2

The composite twisted yarn and the final processed paper were manufactured in the same manner as in Example 1 except that the combustion temperature was set at 180 ° C. The results of evaluating various physical properties of the manufactured composite twisted yarn and processed paper are shown in Table 1.

Comparative Example 3

Except for setting the draw ratio to 1.15, the composite twisted yarn and the final processing paper was prepared in the same manner as in Example 1. The results of evaluating various physical properties of the manufactured composite twisted yarn and processed paper are shown in Table 1.

Comparative Example 4

A polyester having an intrinsic viscosity of 0.62 was melt-spun in a conventional manner to prepare a polyester multifilament that is a highly oriented unoriented yarn of 330 denia / 96 filaments having an elongation of 130%. The obtained highly oriented unstretched yarn was combusted in the second feed roller and the third feed roller using the apparatus shown in Fig. 1, and heat-set in the third feed roller and the fourth feed roller and wound up. At this time, the flammable temperature was set at 200 ° C, the draw ratio was 1.64, the flammable water was set at 2,066t / m, and the thermal setting temperature was set at 180 ° C, respectively. The twisted yarn thus obtained was twisted at 1,000 T / M, and then a plain fabric having a warp density of 68 bones / inch and a weft density of 56 bones / inch was woven.

The plain fabric is S and Z lead is arranged in 2: 2. Next, the plain fabric was post-processed under normal conditions to prepare a final processed paper. The reduction rate was 15%. The results of evaluation of various properties (characteristics) of the manufactured composite twisted yarn and processed paper are shown in Table 1.

Property evaluation result division Composite Combustibles Linearity (R ² ) Processing paper characteristics Sectional variation ratio (ΔRR) Crimp rate (%) Glass transition temperature (℃) Maximum Thermal Stress Temperature (℃) Repulsion Bulky castle Example 1 2.11 8 88 225 0.9747 ◎ ○ Example 2 2.76 7 93 246 0.9873 ○ ◎ Example 3 2.02 10 87 227 0.9824 ○ ○ Example 4 2.69 6 120 252 0.9921 ◎ △ Example 5 1.81 8 114 250 0.9862 ◎ ○ Comparative Example 1 Not measurable One 142 258 0.9985 ○ × Comparative Example 2 0.92 17 82 156 0.8842 △ △ Comparative Example 3 1.20 18 78 138 0.8724 △ ○ Comparative Example 4 0.41 26 Not measurable 250 Not measurable × △

Various physical properties and properties in the present invention were evaluated by the following method.

How to measure elongation (%)

It measured according to JIS L-1090. Using an Instron Model 4201 instrument, a 20 cm length sample was measured at an elongation of 20 cm / min at an initial load of 0.088 x dtex cN. Elongation is defined as the percent elongation at maximum.

Crimp rate (CR) (unit:%)

It measured according to JIS L-1019T. A skein having a length of 50 cm and a winding number of 10 was prepared under an initial load of 0.088 x fine cN. Then, the skein is soaked in hot water having a temperature of 90 ° C. for 20 minutes, and the water is removed with an absorbent paper or cloth, and then dried naturally while fixing the skein horizontally. Thereafter, the dried skein is placed in water at room temperature, and the sample length "a" is measured under a predetermined initial load and a static load. Then, the static load is removed, the sample is left in water for 3 minutes with only the initial load applied, and the length "b" of the sample is measured. The crimp rate CR is calculated by the following equation. The equation for the initial load and the static load is also calculated by the following equation.

Crimp rate (CR) (%) = [(a-b) / b] × 100

Initial load (cN) = [Fineness (dtex) /1.111] × 0.002 × 0.99807 × Number of turns × 2

Static load (cN) = [fineness (dtex) /1.111] × 0.1 × 0.99807 × number of turns × 2

Glass transition temperature, maximum thermal stress temperature, linearity measuring method

Using Kanebo Engineering's thermal stressor (model name, KE-2), the initial load of 0.88 cN / dtex was applied to the string-shaped sample, and then the stress generated in the sample was heated at a rate of 2.5 ° C / sec. To record. Specifically, using the Excel 2000 program, as shown in FIG. 2, a thermal stress curve is obtained by curved the thermal stress value of the sample as the temperature increases by 1 ° C. As shown in FIG. 2, the time point X at which the sample which was thermally expanded with the increase in temperature showed a sudden stress was regarded as the glass transition temperature, and the temperature Y when the thermal stress passed the highest point was set as the maximum thermal stress temperature. 3 is a linear regression of the curve between the glass transition temperature and the maximum thermal stress temperature in the thermal stress curve of Figure 2 using an Excel 2000 program to calculate the linearity (R ² ) through this.

Cross section variation rate (ΔRR) measurement method

As shown in FIG. 4, the maximum distance from the center point to the outer circumference of the cross section is referred to as "L", and the minimum distance from the center point to the outer circumference of the cross section is referred to as "r". Measure For accurate measurement of section variation, the section ratio was obtained using the Image Pro-plus (ver. 4.0) program and the radius ratio was cited as the section variation ratio.

Sectional variation = L / r

As described above, the sectional variation rate of the multiple composite twisted yarns is sorted in ascending order after measurement, and the average value of the sectional variation rate of the filament corresponding to the lower 20% of the sectional variation rate for the total number of filaments is called the minimum sectional variation rate. The average value of the cross-sectional variation of the filament corresponding to the maximum cross-sectional variation rate.

The maximum cross-sectional variation ratio and the minimum cross-sectional variation ratio were substituted into the following equation to obtain the cross-sectional variation ratio difference ΔRR.

Section Change Rate Difference (ΔRR) = Maximum Section Change Rate-Minimum Section Change Rate

How to evaluate repulsion and bulkiness of processed paper

Sensory evaluation was performed by 10 experts. 8 out of 10 experts were classified as ◎, 6 as 6 to 7 were judged as good, ○ as 4 to 5 as judged as △, and 3 as less than 3 as good.

The present invention exhibits good bulkiness, drape and lightness, and a soft dry touch in the production of knitted fabrics.

As a result, the composite twisted yarn of the present invention is particularly useful as a yarn for clothing.

1 is a process schematic diagram of the present invention.

2 is a thermal stress curve of the composite twisted yarn prepared in Example 1.

3 is a graph of linear regression of the curve between the glass transition temperature (X) and the maximum thermal stress temperature (Y) in the thermal stress curve of FIG.

4 is a schematic view of the fiber cross-section.

Explanation of symbols on the main parts of the drawings

A: High elongation multifilament B: Low elongation multifilament 1: First feed roller

2: Air immersion nozzle 3: 2nd supply roller 4: 1st heater (1st heater)

5: flammable part 6: third feed roller 7: heat setting heater (2nd heater)

8: 4th supply roller 9: winding roller X: glass transition temperature

Y: Maximum thermal stress temperature R ² : Linear line

L: Maximum distance from the fiber cross-section center point to the outer periphery of the cross section

r: Minimum distance from the center of fiber section to the outer circumference of the section C: Center point of fiber section

Claims (6)

The super high-strength multifilament (A) and the low-strength multifilament (B) are composite twisted, the crimping rate is 5-15%, the cross-sectional variation rate (ΔRR) is 1.5-3.2, and the glass transition temperature (thermal stress) A composite twisted yarn characterized in that the point of the sudden stress in the curve, X) is 83 ~ 130 ℃, the maximum thermal stress temperature (Y) is 200 ~ 260 ℃, and the linear line (R ² ) is 0.9100 ~ 0.9990. The composite twisted yarn according to claim 1, wherein the high-strength multifilament (A) has an elongation of 80% or more and a single fineness of 0.5 to 3 denier. The composite twisted yarn according to claim 1, wherein the single yarn fineness of the low elongation multifilament (B) is 1.5 to 7 denier. The composite twisted yarn according to claim 1, wherein the elongation difference between the high elongation multifilament (A) and the low elongation multifilament (B) is 40 to 200%. The composite twisted yarn according to claim 1, wherein the weight ratio of the high elongation multifilament (A) and the low elongation multifilament (B) is 8: 2 to 4: 6. In manufacturing composite twisted yarn by combusting and heat setting super-high multi-filament (A) and low-strength multi-filament of screening after air interlocking, draw ratio is 1.00 ~ 1.10 at the time of combusting treatment, and combustion temperature (first heater Temperature) is 220 ~ 235 ℃ manufacturing method of a composite twisted yarn.