KR860002172B1 - Polyester bi-shinkage multimixed yarn and knitting method - Google Patents

Abstract

Yarn consists of two types of polyester fibers with different shrinkage factors. The low shrinkage fiber was copolymerized with glycol and the high shrinkage fiber was copolymerized with phthalic acid. The boiling water shrinkage factor of the high shrinkage fiber is 20-60 %. The fabrics were treated with 2-5 % with NaOH at 95≰C for 10-30 min. Yarn has a soft touch and good draping properties without the need for alkali weight redn. and produces woven fabrics which become bulky and silk-like upon relaxation treatment with hot water.

Description

Fabrication method of polyester double-shrink blend yarn and its woven fabric

The present invention is to use a polyester di-shrink blended yarn and divorced yarn yarn mixed with a highly shrinkable polyester filament yarn and a low shrinkage island-in-the-sea polyester composite filament yarn, and treated with a solution of caustic soda to give silky appearance and feel The present invention relates to a method for producing a knitted fabric and a knitted fabric.

Many attempts have been made to improve the polyester filament yarn having a flat, cold and simple appearance to have the appearance and feel of natural silk. That is, it improves the feel and drape by using the release property of the cross section, the fineness of the filament fineness, the diaxial mixed fiber using two kinds of filament yarns of modified polymer, and the polymer mixed spinning or composite spinning technique using two kinds of polymers. Attempts have been made to improve color and gloss and to impart bulkiness. However, there was some effect on the improvement of the fractional characteristics of the natural silk as described above, but the overall improvement was insufficient.

An object of the present invention is to blend a high shrinkage yarn with a non-shrinkage ratio of 30% or more and a low shrinkage island-in-the-sea composite yarn by air mixing, so that there is an ultrafine polyester filament yarn around the high shrinkage yarn in a subsequent processing step It is to provide a polyester bi-shrinkable blended yarn that has a fine winding and sublime expression potential, and the degradability of the island-in-the-sea composite composite It completely removes the powder and causes the contraction of high shrinkage yarns, so that the high shrinkage yarns act as a supporter on the inner layer of the fabric and knit, and the ultra-fine low shrinkage filament yarn expresses fine crimping and bulkiness on the surface and forms many voids between the fibers. It has the same appearance as natural silk while having excellent physical properties of polyester fabric and knitted fabric. Having a sense of organization, and to be able to produce the fabric.

Another object of the present invention is to obtain ultra-fine cross-section yarns present on the surface of woven and knitted fabrics obtained from islands-in-the-sea composite yarns using two kinds of compatible polyester resins. Compared to the case of using the filament yarn to improve the operability.

Hereinafter, the present invention will be described in detail.

The di-shrink mixed fiber of the present invention has a very high compatibility, but a low shrinkage island-in-the-sea composite yarn using two kinds of polyester resins having very high solubility by solvents as sea and island components, and a dead-shrinkage ratio due to non-aqueous yarn is 4 mg per denier It is a high shrink yarn obtained by stretching the copolymerized filament yarn resin at low temperature so as to be 20-60%.

In the island-in-the-sea composite yarn of the present invention, the sea component is a polyester resin obtained by copolymerizing 3-15 mol% of polyethylene terephthalate glycol or adipic acid-based metal sulfonate salt in 0.4% in 25% ortho chlorophenol solution. -0.5 and dissolution rate in caustic soda solution is 80-200 times faster than regular polyester resin. As for the water content, regular polyester resin having an intrinsic viscosity of 0.65 in a 25% off-sochlorophenol solution was used.The sea water content ratio was 15-70% for sea components, 30-85% for water components, and 3-21 in one filament. Heterogeneous fibrils are formed, and each fibril has a fineness of 0.05-0.5 denier.

When the non-drawn yarn is manufactured by a general filament manufacturing method through a molten composite spinning device and a separate detention apparatus, and then hot drawn at a draw ratio of 3 times or more, the dead-shrinkage ratio by nonaqueous water is 3-7 under a tension of 4 mg per denier. An island-in-the-sea composite yarn is produced.

When manufacturing islands-in-the-sea composite yarn, it should be noted that since the compatibility of the island-in-the-sea component is very large, if the time when the island-in-the-sea component is long, chemical bonds occur during the island-in-sea component, resulting in a third copolymerized polyester resin It is advantageous to form a cross section by integrating in the inlet, and the thermal properties and solidification point of the island-in-sea component are different, so the thickness of the ingot should be 150 mm or more for the uniformity of the cross section. In addition, since the sea component is a copolyester-based resin in which the amorphous region is increased several times as compared to the normal polyester resin, the strength and elongation of the resin oil is very low. Therefore, lowering the component ratio of the sea component can improve the operability. On the other hand, since the melt viscosity of sea component is 1.5-2 times higher than that of island component, the fibrill formation of island components is independent and uniform even though the component ratio of sea component is reduced. You can get it.

In particular, the greatest feature of the island-in-the-sea composite yarn of the present invention is that the island-in-the-sea composites have excellent adhesive strength because of the high compatibility of the island-in-the-sea component, so that the separation of the island-in-sea components by physical or mechanical external forces shown in the incompatible composite yarn does not occur, such as drawing and weaving No post-morning occurs in the post-process and the same solubility as the regular polyester filament yarns from Tadenier. In addition, since the dissolution rate by the solvent of the sea component is more than 100 times faster than the island component under the same conditions, the sea component is not infringed while the sea component is completely extracted. The high shrink yarn of the present invention by spinning the polyester copolymer resin containing 5-15 mol% of phthalic acid or isophthalic acid component by conventional melt spinning method in order to increase the dead-shrinkage ratio by non-aqueous, and to randomly express amorphous crimp After the undrawn yarn is drawn, it is drawn at 2.5-3.0 times of 7080% of the elongation at the secondary transition point of the resin when the undrawn yarn is drawn, and the undrawn part is densely present in the fiber axis direction. High shrinkage with typical non-shrinkage is 20-70% under 4mg tension per denier.

The method of intermixing the island-in-the-sea composite yarn and the high shrink yarn is air mixed with two kinds of chambers by high-pressure air, and 1.5-3.5kg under constant tension when the yarn is passed through an interlacer installed between the supply roller and the intake roller. The filament yarns are mixed with each other by the air pressure of / cm ² . The firing speed is 500-1000m / min and the air nozzle size is 0.5-2mm.

The blending by air blending has two kinds of threads irregularly intertwined, so the blending effect is much higher than the method by twisting uniformly and repeatedly. Since the bond strength between yarns is too great, the crimping effect after shrinkage expression is not irregularly dense, only periodic bishrinkage occurs, and the voids between fibers are incomplete, resulting in partial improvement and simple appearance. When weaving or knitting fabrics using the common thread manufactured by the above-described technique is treated for 10-30 minutes in a 2-5% caustic soda solution at 95 ° C, the shrinkage behavior of high shrinkage yarns and sea component extraction of island-in-the-sea composites At the same time it is completely done.

In general, in the production of bishrink blended yarns, high shrinkage yarns have a short fiber fineness and low number of filaments, and low shrinkage yarns are used for the complete expression of the shrinkage and to increase the effect of multi-wetting on the surface after the shrinkage. Although the fiber fineness is small and the number of filaments is selectively used according to the denier of the total blended yarn, the di-shrink blended yarn of the present invention has a shrinkage behavior of the high shrinkage yarn in a 95 ° C., 2-5% caustic soda solution. Since the sea component extraction of island-in-the-sea composites occurs at the same time, the monofilament fineness of old trees is 4-60 times larger than that of low-shrink fibrils, and the number of filaments in low-shrink yarns increases 3-40 times. Can be saved to the maximum. In addition, while the sea component of the island-in-the-sea composite yarn is completely extracted, the island component has no weight loss effect, the high shrinkage yarn loses less than 5%, and the island component fibrils are very uniform and pointed acid having a fineness of 0.05-0.5 denier. It is formed of an ultra-fine cross-section yarn having a cross section. Double-shrink blended yarns with sea components completely removed, knitted fabrics, and high shrink yarns are centered on the inner layer of the fabric, and the low shrinkage ultrafine filament yarns form fine projections on the surface and are densely distributed. Due to the voids generated between the fibers, the touch to the skin is sensational, and the drape, shrinkage, bulkiness and coefficient of friction of the woven and knitted fabrics increase, and a three-dimensional feeling of thickness appears.

After dyeing, high shrink yarns, which are copolyester-based inner layers, have a darker color than superfine yarns, which are regular polyesters on the surface. Due to the weight loss effect of the dead surface, the appearance not only has an elegant, soft gloss and a delicate color, but also increases durability such as washing resistance by chemical processing. In addition, the high shrinkage of the inner layer with high fineness improves the morphological stability and resilience of the fabrics and knits, and can compensate for the defects in the microfibers and knits. By the air layer, high functionality such as moisture permeability waterproofing and water repellency are obtained at the same time and warm touch.

As described above, the present invention combines polyester resin copolymerization technology, hedo type composite spinning technology, filament yarn drawing and blending technology, and has a unique structure and properties of silk fibers, and exhibits superior touch and appearance than silk fabrics. As a manufacturing technique of bishrink blended yarn, the shrinkage and sea component extraction are carried out simultaneously in a simple post-treatment step to express all the characteristics simultaneously, thereby improving the operability and simplifying the process.

Example 1

The sea component is a polyester resin having 0.466 intrinsic viscosity copolymerized with 10 mol% of sulfonate salt, and the island component is a component ratio of 31% sea component and 69% island component using a regular polyester resin having an intrinsic viscosity of 0.65. After passing through the composite spinning device and the hedo-type detention device forming seven fibrils, spinning at 1,300m per spinning flux minute to make an undrawn yarn, stretching it at a draw ratio of 3.1 times and a drawing speed of 800m / min, and 50 denier / 24 filaments. Hedo type composite yarn was prepared. High shrink yarns are made of unstretched yarns by spinning a polyester resin having an intrinsic viscosity of 0.59 copolymerized with dimethyl isophthalate at a spinning flux of 1350 m / min using a conventional melt spinning machine. Stretching was 2.71 times to prepare a high shrink yarn of 50 denier / 24 filaments.

The prepared island-in-the-sea composite yarn and the high shrink yarn were installed at an air jet interlacer between the feed roller and the intake roller of a separate stretching machine having no draw ratio and air mixed at an air pressure of 3.0 kg / cm ² and a yarn speed of 800 m / min.

In above manufacturing process and blending process, each operation was over 96.7%, and there was no problem on the product. Physical properties are shown in Table (1).

[Table (1)]

Example 2

The weft yarn prepared in Example 1 was used as a weft and weft yarn, and weaved into a flat bottom tissue. At this time, the inclination was not sizing, the dough density was set to be inclined 98ol / inch, weft 88ol / inch in consideration of the shrinkage of woven fabrics. The woven dough was relaxed in a weight loss tank of 95 ° C. in a 3% caustic soda solution for 20 minutes and washed with water to remove shrinkage and sea component, followed by drying in a 140 ° C. dryer for 40 seconds.

After drying, the surface and side cross-sections of the knitted fabrics were observed by electron microscopy, and the sea component of island-in-the-sea composite yarn remained intact and the fibrils had a clean surface, but the high shrink yarn lost about 4%.

In addition, the cross section of the woven and knitted fabrics is completely composed of the fine yarn and the high shrink yarn, and the surface of the woven and knitted fabric has a super microfiber projection, and the center of the woven and knitted fabric has the high shrink yarn oriented, and the fine microfiber crimp is partially formed. there was. The shrinked woven and knitted fabrics were dyed at 130 ° C. for 60 minutes, and the area shrinkage of the processed paper set at 160 ° C. was 42% and the weight loss rate was 19%. The density of woven and knit fabrics was inclined 131 / inch and weft 124 /. Was inches.

The processed paper forms a dense woven and knitted fabric, and has obtained a sensual touch, woven and knitted fabric. There was no problem in the process, and the operability was the same as that of regular 100 denier / 48 filament.

Example 3

The yarn prepared in Example 1 was used as the warp yarn, and the weft yarn was stretched by separate sea-island composite yarn having fibril fineness of 0.45 denier in 50 denier / 24 filament and three fibrils in one strand of filament. As a result of weaving and post-treatment in the same manner as in Example 2, the density of the woven fabric and the knitted fabric became thinner and smoother, more flexible, and the drape was improved, but the elastic form stability and bulkiness of the woven fabric were reduced.

Example 4

The island-in-the-sea composite composite yarn having a fibrillation number of 21 and fibril fineness of 60 denier / 24 filaments having a resin used in Example 1 and having fibrillation fineness of 0.06 denier was spun in the same manner as in Example 1 and stretched as in Example 1. It extended | stretched at the speed of 600 m / min, and draw ratio 3.037.

The high shrink yarn was stretched at a thermal temperature of 70 ° C. and a draw ratio of 2.91 times after spinning the resin used in Example 1 as in Example 1. At this time, the fibrillated state in the filament of the prepared island-in-the-sea composite yarn was formed independently, but the appearance and size of the fibrils were uneven.

In other words, the outer part of the cross section is an isosceles triangle with a long side, the cross section is large, and the central fibrils have an equilateral triangle with a small cross-sectional area. did.

In addition, as in Example 1, the elongation of the elongated yarn is different from the elongation of the high-contracted yarn, so that a loop occurs in the blended yarn at the time of air mixing, thereby lowering the firing speed to 635 m / min.

The operability was good as 95% or more, and the physical properties are shown in Table (2).

[Table 2]

Example 5

The yarn prepared in Example 4 was non-sized and used as a warp yarn, and two twisted yarns of the island-in-the-sea composite yarn of Example 4 were woven and knitted instead of crepe with a warp density of 87ol / inch and weft density of 78ol / inch. It was.

As a result of treating the dough in the same manner as in Example 2, it had a clearer appearance and feel than in Example 2, and the drape elasticity and the like resulted in a silky weave, an excellent weave and knit fabric.

[Textile, Knitted Characteristic Values]

Comparative Example 1

Simultaneous stretching of the island-in-the-sea composite non-drawn yarn spun in Example 1 and the high shrinkage undrawn yarn was carried out simultaneously with the same type and same method as the interlacer used in Example 1.

Although the quality level and blending effect of blended yarns were good, the shrinkage effect after heat shrinkage was about 10%, and the crimping effect by shrinking was not significant.

[Non-shrinkage rate]

Claims (4)

A polyester bi-shrink blended yarn obtained by mixing a polyester-based islands-in-the-sea composite yarn having compatibility and solvent solubility with a highly shrinkable polyester having a dead-shrinkage ratio of 20-60% in nonaqueous by an air blending method. The island-in-the-sea composite yarn according to claim 1, wherein the island-in-the-sea composite yarn comprises a polyester resin having 3% -15 mol% of a glycol or adipic acid-based metal sulfonate salt as a sea component. The high shrinkable polyester filament yarn is made of a polyester resin obtained by copolymerizing a phthalic acid or an isophthalic acid component. Polyester bispun blended yarn made of polyester-based island-type composite yarn with different solvent solubility and high shrinkage polyester filament yarn with non-aqueous solution having 20% to 60% shrinkage ratio A method of producing a woven or knitted fabric made of polyester biaxially blended yarn which is treated at 95 ° C. for 10 minutes to 30 minutes in an aqueous solution of 2-5% caustic soda.