KR930010790B1 - Method for preparation of differential shrinkage mixing yarn - Google Patents

Abstract

interlacing the highly- oriented undrawn polyester filament yarn, spun with the speed of more than 4500 m/min, with the high-shrinkage polyester drawn yarn, whose residual heat-shrinkage rate (rs2) after normal heat-treatment is 10-40 %, and which is copolymerized with 2-15 mol% of third component, selected among isophthalic acid, 6-dicarbonic acid, adipic acid, sebacic acid, diethylene glycol, trimethylene glycol, etc., at before the input of the false-twisting heater, satisfying the eq. (1),(2) (where n: birefringence of the highly-oriented yarn, Pt: temp. to generate max. heat-stress of the high-shrinkage yarn, Ht: temp. of the heater), or after the untwisting zone, with the interlacing no. of 20-100 ea./m.

Description

Manufacturing method of biaxial composite yarn

The present invention relates to a method for producing a biaxially-composite yarn having good process permeability and simultaneously expressing an excellent volume and warm feeling on a knitted fabric, as well as a soft gloss and a soft surface feel.

2. Description of the Related Art In order to express a moderate volume with a soft silk gloss and a smooth surface feel, two-strand blend yarns in which two stretched yarns having different thermal shrinkage rates are mixed with air flow are widely used.

However, the biaxially blended fiber produced by this conventional technique has a smooth surface and good gloss, but is a simple entanglement of non-crimped filaments. Silver is close to a cold metallic luster, so it is virtually impossible to express abundant bulkiness and warm feeling. Also, in order to effectively reproduce the difference in heat shrinkage characteristics of the yarn state on a knitted fabric, the productivity is large because the low temperature and storage capacity in the weaving preparation and the post processing must proceed at the lowest possible temperature. Falls.

Contrary to this Isu Siksum blend, there is a combustible work.

In general, knitted fabrics made of combustible fabrics have a good sense of volume and warmness, and are relatively easy to dye, rather than the case of biaxial blended yarn. However, drawbacks have been pointed out that woven fabrics made of ordinary false twisted yarn are not smooth, uneven, and glossy.

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 sheath type composite yarn (Japanese Patent Application Laid-Open No. 49-72442). There is a method of weaving using a barn and a torque force (JP-A-47-23349), or air jet blend (JP-A-61-20661) to produce a deep sheath-type composite yarn having a loop and a relaxation part on its surface.

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, a smooth surface feel and appearance (gloss) cannot be expected.

In addition, a method of manufacturing a pleated composite yarn in which the non-crimped filament yarn is supplied excessively than the crimped yarn and the air jet interweave is arranged in the core and the non-crimped filament yarn is arranged at the beginning, in which case the surface layer of the yarn Because it is composed of non-crimped filament yarn, it has a strong feeling of coldness, and due to the large number of loops, process passability is poor, and the surface of the knitted fabric becomes rough, so the processed yarn manufactured by this technique cannot expect a smooth surface feel and appearance. .

The present inventors have diligently resolved these drawbacks of the prior art and provide a method of manufacturing a processed yarn that exhibits subtle gloss and smooth surface feel while providing excellent bulkiness and a warm feeling. The present invention leads to a completely different invention from the conventional method of blending two non-crimped yarns.

The present invention shows that the highly oriented unstretched yarn spun at a speed of 4,500 m / min or more shows superior crimping properties than that of ordinary stretched yarns after burning, and that the cross-sectional deformation is considerably less than that. The high shrinkage yarn has been shown to exhibit excellent crimping properties while maintaining high shrinkage even after burning, and to show relatively severe cross-sectional deformation. Interlacing gives shape stability and connectivity, enables similar crimping properties to these two yarns, and reduces cross-sectional deformation of the filaments constituting the highly oriented unstretched yarn as much as possible. And the flammable temperature to keep the heat shrinkage as high as possible after The crimped filaments produced by the fixed shrinkage composite yarns can express both the good process passability and the crimping and the shrinking effect at the same time. By contracting, it is possible to exhibit a soft gloss and a smooth surface effect.

In other words, the present invention is a high-oriented unoriented polyester filament yarn (hereinafter referred to as a high orientation yarn) radiated at a spinning speed of 4,500 m / min or more and a high shrink polyester yarn having a residual heat shrinkage (hereinafter referred to as rs ₂ ) of 10 to 40% after formal heat treatment In the case of mixed island combustion by interlacing the high shrinkage yarn before or after the introduction of the burner heater, when the birefringence of the high orientation yarn is Δn, the maximum heat stress expression temperature of the high shrinkage yarn is Pt, and the burner heater temperature is Ht. These are the manufacturing method of the bi-shrink composite yarn characterized by satisfying the following relational formula (1)-(2) simultaneously.

Hereinafter, the present invention will be described in detail.

In the present invention, the polyester yarn in which the high orientation non-oriented polyester filament yarn (hereinafter referred to as high orientation yarn) radiated at a spinning speed of 4,500 m / min or more as a starting yarn and the residual heat shrinkage ratio (hereinafter referred to as rs ₂ ) after formal heat treatment satisfy a predetermined level. Use a shrine (hereafter a conifer).

In the present invention, the high orientation yarn should be radiated at a spinning speed of 4,500m / min or more, when the unstretched yarn radiated at a speed of less than 4,500m / min mixed with the high shrinkage yarn and burned, the running stability of the blended yarn It is unstable, the composite twisted yarn is easy to form an unstable two-layer structure, and the cross-sectional deformation of the highly oriented yarn or the highly oriented yarn or undrawn yarn is worse than the high shrink yarn to achieve the object of the present invention 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.

High shrinkage should have an rs ₂ of 10-40%. Here, rs ₂ is defined as below and is a measure of heat shrinkage retention for the heat treatment, and may be referred to as residual heat shrinkage rate after formal heat treatment.

rs ₂ = [(1o-1 ₁ ) / 1 ₀ ] × 100 (%)

In high shrinkage yarns, the rs ₂ is less than 10%, so the residual shrinkage rate is low, so it is difficult to expect a shrinkage effect. In general, highly oriented yarns have very low rs ₂ , so even if rs ₂ is less than 10% of high shrinkage yarns, some shrinkage effects can be expected. In this case, the combustible temperature should be lowered as much as possible, and the heat shrinkage rate of the manufactured composite yarn is low. The bending and densification of the fabric due to the heat shrinkage of the composite yarn constituting the woven fabric can not be expected to satisfy the overall desired effects of the present invention.

The higher rs ₂ is more than 10%, which is advantageous in terms of the shrinkage effect, but if it exceeds 40%, the residual shrinkage rate is too high after combustible processing, resulting in tactile hardening and shrinkage nonuniformity on the dyed fabric. .

When the rs ₂ is 15 to 30% of the high shrinkage yarn of the present invention, it is possible to more effectively achieve the purpose of the present invention.

The high shrink polyester stretched yarn having an rs ₂ of 10 to 40% includes polyester high magnification stretched yarn or copolymerized polyester drawn yarn copolymerized with a third component that improves heat shrinkability. In the former case, the stretched yarn is soft. It does not have good elongation and is not suitable for combustible processing.

Therefore, in order to ensure the effect of this invention, it is preferable to use the copolymer polyester stretched copolymer which copolymerized the 3rd component which improves heat shrinkability. Examples of such copolymerized third components include isophthalic acid, 6-dicarboxylic acid, adipic acid, sebacic acid, diethylene glycol, trimethylene glycol, polyethylene glycol having a molecular weight of about 600 to 6,000, bisphenol A, bisphenol sulfone, and bisphenol A. Water, the ethylene oxide addition product of bisphenol sulfone, etc. are mentioned.

In order to easily produce a mechanically stable yarn with rs ₂ of 10 to 40%, the content of the copolymerized third component is preferably 2 to 15 mol%.

If the content of the third component is less than 2 mol%, it is not preferable because there is almost no copolymerization effect, and thus the high magnification is stretched as described above. If the content of the third component is more than 15 mol%, the mechanical strength of the twisted yarn is lowered, Thermal curing or embrittlement tends to occur, which is not preferable.

The present invention is completed by intertwining such highly oriented yarns and high-yield yarns by entanglement treatment before or after the introduction of the combustible heater or after the sea area.

In order to obtain the form stability and uniformity of composite yarns, entanglement treatment is essential. That is, in the continuous process, the interlacing device may be attached to an appropriate position before the combustible heater, or the interlacing device may be attached after the sea area to be interlaced, or the interlaced blended yarn may be combusted by a separation process.

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 or the like occurs, which is not preferable.

In the present invention, the temperature of the combustion heater (hereinafter referred to as Ht) during the combustion process is-(0.02Pt) ³ + 0.0076Pt ² -0.9Pt + 145≤Ht≤Δn × 1000 + 100 and Ht≤-0.03 × (rs ₂ ) ² It should be set to satisfy the range of + 2.5 × (rs ₂ ) +165 simultaneously.

This temperature range is essential for giving effective crimping properties to both high orientation yarns and high shrink yarns, while allowing the cross-sectional deformation of the high orientation yarns to proceed as little as possible than the stretched yarns, and to maintain the high shrinkage rate of the high shrink yarns as high as possible.

If Ht is lower than-(0.02Pt) ³ + 0.0076Pt ² -0.9Pt + 145, the working stability of thread yarn during combustion is poor, so the cutting is frequent, the workability is very low, and it is impossible to give effective crimp to the drawn yarn. It does not meet the purpose of the invention.

In addition, when Ht is higher than Δn × 1,000 + 100, the crimping property of the composite yarn is improved, but the cross-sectional deformation of the high-orientation yarn is increased, so that the composite yarn is similar to ordinary false twisted yarn, and thus the object of the present invention cannot be achieved.

However, even if Ht is lower than Δn × 1,000 + 100, if Ht ≦ −0.03 × (rs ₂ ) ² + 2.5 × (rs ₂ ) +165 is not satisfied, the heat shrinkage rate of the high shrinkage yarn after blending flame is so low that the object of the present invention Cannot be achieved.

Therefore, in the present invention, the temperature (Ht) of the combustible heater must be-(0.02Pt) ³ + 0.0076Pt ² -0.9Pt + 145≤Ht≤Δn × 1,000 + 100 and Ht≤-0.03 × (rs ₂ ) ² +2.5 The range of × (rs ₂ ) +165 must be set to satisfy at the same time,-(0.02Pt) ³ + 0.0076Pt ² -0.9Pt + 150≤Ht≤Δn × 1,000 + 90 and Ht≤-0.03 × (rs ₂ ) ^If the range of ₂ +2.5 x (rs ₂ ) + 155 is satisfied at the same time, the object of the present invention can be more surely and effectively achieved.

Example 1

Polyester highly oriented undrawn yarn (50D / 36F, Δn = 115) and polyester drawn yarn (50D / 12F, maximum thermal stress expression temperature = 124 ° C, rs ₂ = 17.8%) spun at a speed of 6,500 m / min Combustion condition with interlacing nozzle between feed roller and combustible heater 70 times / m (measured in hybrid combustor), spindle rotation speed 250,000 RPM, combustible water Z3125TPM, combustible condition with overfeed rate -1% The twin-shrink composite yarn was manufactured by mixing the mixed-heat and twisting the flammable heater at 140 ° C. (The set temperature range (Ht) of the flammable heater calculated by the formula of the present invention was 135 ° C≤Ht≤215 ° C and Ht≤200 ° C). It is 135 ℃ ~ 200 ℃ to satisfy simultaneously)

Each biaxial composite yarn prepared in this way was set at a density of 150 bones / in on a warp yarn, and a plain weave fabric was made of polyester 75D / 72F and twisted yarns (2800TPM) as s: z = 2: 2 and 72 bones / in. After weaving, the plain fabric was dyed by conventional methods. The characteristics and dyeing results of the composite twisted yarns prepared by heater temperature are shown in Table 1.

The heat shrinkage rate (TSR) and crimp recovery rate of high shrink yarns and highly oriented yarns is the result of the test of high shrink yarns and high oriented yarns separately from hybrid combustible composite yarns without applying entanglement under the same flammable condition. (TSR) is measured by the same method as rs ₂ , but obtained by omitting the first formal 100 ° C. heat treatment for the sample, and the crimping recovery rate is 1 minute at room temperature for 15 minutes in 90 ° C. hot water under no tension, After drying, put a load of 0.1g / d into a mass cylinder containing 20 ± 2 ℃ distilled water, measure the length (Lo) after 2 minutes, change the load to 0.001g / d and put it again, measured after 3 minutes from the length (L ₁₎ it was obtained by the formula of the crimp reconstruction ratio [= (Lo-L ₁₎ / Lo] × 100 (%).

As for the cross-sectional deformation degree, the cross section of the biaxial composite yarn thus prepared was observed under a microscope, and the most severe cross-sectional deformation was 1, and the lowest was 5.

[Example 2-4, Comparative Example 1-3]

The same method as in Example 1 was performed except that the flammable heater temperature was performed as in Table 1.

TABLE 1

※ Act: ◎ = very good, ○ = good, × = bad

The method of the present invention (Examples 1-4) is excellent in combustible workability and weaving, and the crimp recovery rate of the composite yarn is 20% or more, while the total heat shrinkage (TSR) difference between the high orientation yarn and the high shrinkage yarn is 7% or more. It is effective, and the degree of cross-sectional deformation of high orientation yarns is low, and the dyed paper to which it is applied is a high-quality fabric which exhibits a very good volume, soft surface feel and soft gloss.

The setting of the burner heater temperature lower than-(0.02Pt) ³ + 0.0076Pt ² -0.9Pt + 145 (Comparative Example 1) resulted in severe vibration of the blending thread during the combusting process, resulting in frequent cutting and poor weaving. The woven fabric showed little crimping effect, so it was similar to the general diaxial blended yarn and lacked volume.

In addition, both the range and the range where the combustible heater temperature (Ht) satisfies Ht≤Δn × 1,000 + 100 but does not satisfy Ht≤ -0.03 × (rs ₂ ) ² + 2.5 × (rs ₂ ) +165 (Comparative Example 2) In the case of higher setting (Comparative Example 3), not only the shrinkage effect was insufficient but also the cross-sectional deformation of the highly oriented yarn proceeded severely, so that the composite yarn and the fabric to which it was applied were similar to those of ordinary twisted yarn having a rough surface and almost no gloss.

[Comparative Example 4]

The high shrinkage yarn of Example 1 and the polyester highly oriented unstretched yarn (50D / 36F, Δn = 0.041) spun at 3,000 m / min, have a combustion temperature of 140 ° C. and other conditions in the same manner as in Example 1 Was prepared. Using the blended twisted yarn prepared in this way, the same fabric as in Example 1 was prepared and subjected to normal dyeing processing.

Table 2 shows the crimp recovery and thermal shrinkage (TSR), cross sectional strain, flammability and weaving of composite yarns.

TABLE 2

The running stability of the blended yarn was poor during the combusting operation, and the manufactured blended combustible yarn had an unstable two-layer structure, which resulted in poor weaving. There was no gloss and little gloss, similar to the conventional two-layer structure.

[Comparative Example 5]

Polyester drawn yarns with rs ₂ of 8.1% (50D / 36F, maximum thermal stress expression temperature of 99 ° C.) and the high orientation yarns of Example 1 were subjected to the same burning conditions as those of Example 1, except that the combustion stability The blended twisted yarn was produced while changing to a relatively good 130-200 ° C.

Even if the composite yarn thus prepared was set at any temperature, the heat shrinkage difference between the stretched filament twisted yarn and the highly oriented filament twisted yarn constituting the blended twisted yarn was less than 4%, resulting in little shrinkage effect.

Claims (3)

Highly oriented unstretched polyester filament yarn spun at a spinning speed of more than 4,500 m / min and high shrink polyester stretched yarn with residual thermal shrinkage (rs ₂ ) of 10-40% after suit heat treatment A method for manufacturing bishrimp composite yarns characterized in that intermixing is combusted with entangled 20 to 100 / m before or after the introduction of a combustible heater that satisfies the temperature at the same time. -Down- (Wherein Δn = birefringence of high orientation yarn, Pt = maximum thermal stress expression temperature of high shrink yarn, Hr = combustible heater temperature) The high shrink polyester stretched yarn according to claim 1, wherein, as the third component, isophthalic acid, 6-dicarboxylic acid, adipic acid, sebacic acid, diethylene glycol, trimethylene glycol, bisphenol A, polyethylene glycol having a molecular weight of 600 to 6,000, bisphenol A method for producing a bishrink composite yarn comprising copolymerizing one selected from sulfone, ethylene oxide adduct of bisphenol A, and ethylene oxide adduct of bisphenol sulfone. The method of claim 1 or 2, wherein the high shrink polyester stretched yarn is a copolymer of 2 to 15 mol% of a third copolymer component.