KR20120007173A - Side by side type polyester conjugated filament with excellent crimp property and process of producing thereof - Google Patents

Abstract

PURPOSE: A two-component hollow filament of side-by-side type and a method for fabricating the same are provided to ensure excellent bulk property and texture. CONSTITUTION: A method for manufacturing two-component hollow filament of side-by-side comprise: a step of separately supplying polyethylene terephthalate polymers and polytrimethylene terephthalate polymers to two extruders and melting; a step of extruding two kinds of polymers by a spinneret of two slit types; and a step of passing the polymer through a freezing unit and rolling.

Description

Side by side type bicomponent hollow filament with excellent crimping property and its manufacturing method {Side by Side Type Polyester Conjugated Filament With Excellent Crimp Property And Process Of Producing Thereof}

The present invention relates to a side by side type bicomponent hollow filament having excellent crimping properties. Specifically, the present invention relates to a hollow filament having a crimping characteristic such as wool, and spontaneously becoming a spiral structure during hot water treatment to express a touch and elasticity such as wool.

Synthetic fibers have a shorter history than natural fibers, but with repeated technological developments, they have reached levels comparable to natural fibers in some characteristics. However, crimping property is regarded as an inherent property of natural fibers such as wool as a property that synthetic fibers cannot easily express.

Conventional techniques for imparting crimping properties to synthetic fibers include (i) a method of producing biaxial composite twisted yarn by braiding, twisting and heat-fixing two kinds of synthetic fibers (yarn) having a large difference in elongation characteristics, and (ii) In manufacturing, a method of mixing a polyurethane fiber and other synthetic fibers having excellent elasticity in the longitudinal direction and (i) a method of producing a composite fiber by complex spinning two kinds of polymers is known.

Among the above methods, a method for producing biaxial composite twisted yarn is a method of imparting a potential difference in shrinkage by braiding-flamming-heat fixing two kinds of yarns having a large difference in elongation characteristics. In other words, by utilizing the difference between the strain in the flammable area and the residual strain after disintegration, the yarns in the screening and superficial yarns are relatively more deformed, leading to screening and intermingling.

The biaxial composite twisted yarn exhibits good crimpability due to a difference in elongation characteristics between the screening and the super yarn during heat treatment in a post-treatment process. However, this method is relatively weak because of the uneven appearance of crimping and the binding force of screening and weaving depends on air entanglement, etc. there was.

In addition, the method of manufacturing the biaxially twisted composite twisted yarn is difficult to refine the fineness because it combines two or more kinds of yarns, and the process becomes complicated and the manufacturing cost increases because the two or more kinds of yarns already produced must be dismantled and plyed again. There was.

On the other hand, the method of mixing a polyurethane fiber and other synthetic fibers when manufacturing the knitted fabric has a disadvantage that is difficult to process because it is different from the physical and chemical properties of the polyurethane fiber. For example, polyester fibers should be dyed with disperse dyes, while polyurethane fibers should be dyed with acid dyes or metal dyes, since the washfastness is greatly reduced when dyed with disperse dyes.

Therefore, when mixing polyester fiber and polyurethane fiber in the manufacture of woven fabric, chlorobenzene-based or methylnaphthalene-based dyeing carrier must be used when dyeing, and the final product is vulnerable to chlorine-based bleaching agent and caustic soda. There are many problems such as being easily hydrolyzed by.

There are two methods for producing latent crimps by complex spinning: (i) using two different polymers with different viscosities, and (ii) expressing crimps using two different polymers with different shrinkage rates.

Among them, a method for producing a composite spun latent yarn using a homopolymer having different viscosities is to spin two polymers having different viscosities in the form of side by side, and thus, the two polymers having different viscosities in the longitudinal direction. After the yarns are bonded to each other at the interface of the yarns, the yarns are heat-treated in a relaxed state to express the crimp in the form of a spring due to the difference in shrinkage stress due to the difference in viscosity of the two polymers.

The latent crimping yarn by the composite spinning is easy to dye and post process by using the polymer of the same type, and is a method that has been widely used in recent years, showing a unique soft touch. As a result, the method of complex spinning two kinds of polymers having different viscosities as described above can solve the problems of various methods, and has the advantages of shortening work processability and cost reduction, and excellent elasticity and soft touch. Wide range of applications as well as woven fabrics.

Next, the latent crimping yarn by the difference in shrinkage ratio is spun to have different side-by-side cross-sections of polymers in the form of side by side. It is a method of expressing crimp by external force or the like. The above method can be applied to polymerize a resin having a difference in shrinkage due to heat or external force, and in particular, at least one polymer must have different physical properties than the other polymer in order to show a difference in shrinkage. Conventional side-by-side polyester composite yarn prepared by the above method is polyethylene terephthalate (PET, A) and polytrimethylene terephthalate (PTT, B) in a side by side on the fiber cross-section as shown in FIG. It has a bonded cross section.

The conventional method has been published as a "method of producing a polyester-based latent crimp composite fiber and a composite fiber produced therein" of the Republic of Korea Patent Publication No. 10-2007-0047088, the contents of the PET / PTT two kinds Melt each of the polymers and spin them through separate discharge holes. The yarn cross-section is side-by-side peanut shape, which can cause the problem of twisting the shape of the top, bottom, left and right according to the weaving method. There was a risk that theodolite and squeak (glossy non-uniformity) phenomena would occur after processing and post-processing.

The present invention solves the problems of the prior art, while excellent in form stability during weaving fabrics, but not theodolite and squeak (glossy non-uniformity) phenomenon after the dyeing / post-processing, spontaneously during hot water treatment due to excellent potential crimping It has a three-dimensional spiral structure, and has a hollow portion in the center of the cross-section, so that the light weight, feel, bulkiness, elasticity and the like provides a side by side bicomponent hollow filament similar to wool.

The side-by-side bicomponent hollow filament of the present invention for achieving such a problem is a polyethylene terephthalate polymer and a polytrimethylene terephthalate polymer having an intrinsic viscosity difference of 0.26 to 0.38 dl / g, respectively, in two extruders. After supplying separately to melt the polymer, the two-slit spinning is formed so that the half-slit polyethylene terephthalate polymer slit and the polytrimethylene terephthalate polymer slit having a larger area than the slit for the polyethylene terephthalate polymer face each other in pairs. The molten polymer is discharged through the detention, and the melted polymer is solidified while passing through a cooling unit in which a cooling wind of 0.3 to 0.5 m / sec is formed, followed by oiling and winding.

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

First, the side-by-side bicomponent hollow filament of the present invention has two polyester-based polymers, namely, polyethylene terephthalate (PET, A) and polytrimethylene terephthalate (PTT, B) on the cross-section of the monofilament. The filaments are arranged in side by side type.

In the center of the cross section of the hollow filament, as shown in FIGS. 3 to 4, a circular hollow portion C is formed at an area of 5 to 30% of the total area of the cross section, that is, at a hollow rate of 5 to 30%. . If the porosity exceeds 30%, the radioactivity, the elasticity and strength of the fiber is significantly reduced, if less than 5% is light weight.

3 is a schematic cross-sectional view of a hollow filament according to the present invention, Figure 4 is a cross-sectional micrograph of the hollow filament according to the present invention.

The single filament fineness of the hollow filament is 2.0 to 4.5 denier, which is similar to that of wool, thereby increasing form stability and elasticity. In addition, the hollow filament according to the present invention is composed of 5 to 36 monofilaments, the total fineness is preferably 30 to 150 denier.

The polyethylene terephthalate polymer has an intrinsic viscosity of 0.60 to 0.64 dl / g, and the polytrimethylene terephthalate polymer has an intrinsic viscosity of 0.90 to 0.98 dl / g. The intrinsic viscosity difference is preferably 0.26 to 0.38 dl / g for forming the hollow portion and imparting elasticity and strength of the fiber.

The ratio between two polyester-based polymer polyethylene terephthalates (PET, A) and polytrimethylene terephthalate (PTT, B) can be 20:80 to 80:20. If the ratio of PTT is high, radioactivity will fall. In addition, the shrinkage difference between these polymers is about 5 to 10%. If the difference is less than 5%, the crimp formation worsens, and when the difference is more than 10%, the radioactivity and the fiber properties are significantly lowered. A small amount of additives such as a matting agent and a sunscreen agent may be added to the two kinds of polyester polymers (A and B).

Side by side bicomponent hollow filament according to the present invention is a cross-sectional view of two polyester-based polymer polyethylene terephthalate (PET, A) and polytrimethylene terephthalate (PTT, B) in the same process as in FIG. After the composite spinning to have a shape can be prepared by stretching and heat-treated the spun hollow filament.

1 is a process schematic diagram of manufacturing a side-by-side bicomponent hollow filament according to the present invention. Two kinds of polyester polymer polyethylene terephthalate (PET, A) and polytrimethylene terephthalate (PTT, B) are separately supplied to two extruders (1, 2) to melt the polymer, and then The molten polymer is discharged through the spinneret 3 having (4), and the discharged molten polymer solidifies in a fiber form while passing through the cooling section 5.

In the spinneret 3 of the present invention, the spinning nozzle 20 in which the polymer in the molten state is discharged has a half-slit slit shape, and a half-slit polyethylene terephthalate (PET, A) polymer slit and the polyethylene terephthalate (PET). A) Polytrimethylene terephthalate (PTT, B) polymer slit having a larger area than the polymer slit uses a two-slit spinneret configured to face each other in pairs, wherein the spinning nozzle 20 is a half-moon type A pair of slits 100 for polyethylene terephthalate (PET, A) polymer and a pair of slits 200 for polytrimethylene terephthalate (PTT, B) polymer are formed to face each other, as shown in FIG. 5. The spinning nozzle consisting of more than 12 pairs are formed on the spinneret.

In the present invention, as shown in FIG. 6, the slit 100 for polyethylene terephthalate (PET, A) polymer has an outer arc 110 of 0.30 to 0.38 mm in diameter and an inner arc 120 of 0.10 in diameter. It is a half moon shape of 0.15 mm, the slit for the polytrimethylene terephthalate (PTT, B) polymer is a half moon shape having an outer arc 220 of 0.35 to 0.41 mm in diameter and an inner arc 210 of 0.08 to 0.12 mm in diameter. When the distance 230 between the two slits is 0.02 to 0.04 mm, a circular hollow part may be stably formed when considering the difference in inherent properties of the raw material polymer. In the spinneret 3 of the present invention, the polyethylene terephthalate (PET, A) polymer slit 100 is located on the outer circumferential surface side of the spinneret, and the polytrimethylene terephthalate (PTT, B) polymer slit 200 is spinning It may be made to be formed toward the center of the detention.

The cooling unit is preferably to form a cooling wind of 0.3 ~ 0.5m / sec, the cooling wind is preferably a temperature below the Tg of the raw material polymer.

After the oil ring (6) to the filament, the first gourd roller (7) and the second gourd roller (8) is stretched if necessary and then wound on the winder (9).

Monofilaments in which two polyester polymers (A, B) having an intrinsic viscosity difference of 0.26 to 0.38 dl / g are arranged in a side by side type on a cross section of the monofilament according to the present invention. The monofilament has a circular hollow portion (C) formed at an area of 5 to 30% of the total cross-sectional area of the monofilament, and has a single yarn fineness of 2.0 to 4.5 denier and a density of 1.30. Excellent side-by-side bicomponent hollow filament characterized in that the ~ 1.35g / ㎠, the thermal stress is 0.60 ~ 0.65 g / d and the heat shrinkage is 15 ~ 20%.

The side-by-side bicomponent hollow filament of the present invention has excellent morphological stability when weaving the fabric, but does not cause theodolite and squeeze (glossy nonuniformity) after dyeing / post-processing, and expresses a unique fine crimp like wool. Lightweight, bulky and stretchy, it has the advantage of expressing a soft touch and resilience.

1 is a process schematic diagram of an example of manufacturing a side by side bicomponent hollow filament according to the present invention;
Figure 2 is a schematic cross-sectional view of a conventional side by side type polyester composite yarn.
Figure 3 is a schematic cross-sectional view of the side-by-side bicomponent hollow filament according to the present invention,
Figure 4 is a cross-sectional micrograph of the side-by-side bicomponent hollow filament according to the present invention.
5 is a plan view of the spinneret in the spinning device of the side-by-side bicomponent hollow filament according to the present invention;
6 is a schematic diagram of a spinning nozzle formed in the spinneret and having two slits.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples. However, the present invention is not limited only to the following examples.

Example 1

Polyethylene terephthalate (PET, A) polymers with an intrinsic viscosity of 0.63 dl / g and polytrimethylene terephthalate (PTT, B) polymers with an intrinsic viscosity of 0.95 dl / g are separately supplied to two extruders. After melting, they were slit for a semi-dal polyethylene terephthalate (PET) polymer having an outer arc diameter of 0.35 mm and an inner arc diameter of 0.15 mm, and a half moon polytrimethylene tere having an outer arc diameter of 0.40 mm and an inner arc diameter of 0.12 mm. The slit for phthalate (PTT) polymer was composite-spun into a side by side shape having a hollow part having a hollow ratio of 5% at the center of the cross section through a two-slit spinneret facing each other so that the distance between the two slits was 0.04 mm. Thereafter, the resultant was passed through a cooling section under a 0.4 m / sec cooling wind condition, and wound up to prepare a polyester hollow filament of 30 denier / 12 filaments having a single yarn fineness of 2.5 deniers.

The polyester hollow filament manufactured as described above had a density of 1.33 g / cm 2, similar to that of wool, and a thermal stress of 0.60 g / d and a heat shrinkage rate of 15%, which can be well expressed in potential crimp performance and elasticity. Excellent.

Comparative Example 1

Polyethylene terephthalate (PET, A) polymers with an intrinsic viscosity of 0.63 dl / g and polytrimethylene terephthalate (PTT, B) polymers with an intrinsic viscosity of 0.95 dl / g are separately supplied to two extruders. After melting, they were spun and wound in a semi-circular spinneret to form a side by side without hollow parts at the center of the cross section as shown in FIG. 2 to obtain a polyester hollow filament of 30 denier / 12 filaments having a single densities of 2.5 deniers. Prepared.

The polyester hollow filament manufactured as described above had no change in physical properties except for lightness, but because it was a composite spinning by different materials, it could be manufactured as a fabric which is a post-process with a snowman-type or peanut-shaped cross-section rather than a circular shape. If you have a slant (aka squeak) is likely to occur.

1,2: Extruder 3: Spinneret
4: heat insulation portion 5: cooling portion
6: oil ring device 7: first go roller
8: second gourd roller 9: winder 20: spinneret
100: slit for high viscosity polymer 200: slit for low viscosity polymer
A: high viscosity polymer B: low viscosity polymer C: hollow part

Claims (5)

After the polyethylene terephthalate polymer and the polytrimethylene terephthalate polymer having an inherent viscosity difference of 0.26 to 0.38㎗ / g are separately supplied to the two extruders, the polymer is melted,
The molten two kinds of molten semi-dalized slits for polyethylene terephthalate polymer and polytrimethylene terephthalate polymer slits having a relatively larger area than the slits for polyethylene terephthalate polymer are faced in pairs. Discharge the polymer,
Preparation of the side-by-side bicomponent hollow filament having excellent crimpability, characterized in that the discharged molten polymer is solidified while passing through a cooling section in which a cooling wind of 0.3 to 0.5 m / sec is formed, followed by oiling. Way. The slit for polyethylene terephthalate polymer according to claim 1, wherein the slit for the polyethylene terephthalate polymer has a half moon shape having an outer arc diameter of 0.30 to 0.38 mm and an inner arc diameter of 0.10 to 0.15 mm, and the slit for the polytrimethylene terephthalate polymer has an outer arc diameter of 0.35 to 0.41. A method for producing a side-by-side bicomponent hollow filament having excellent crimping properties, wherein the inner arc has a half moon shape having a diameter of 0.08 to 0.12 mm and the spacing between the two slits is 0.02 to 0.04 mm. According to claim 1, wherein the polyethylene terephthalate polymer has an intrinsic viscosity of 0.60 ~ 0.64 dl / g, the polytrimethylene terephthalate polymer has an intrinsic viscosity of 0.90 ~ 0.98 dl / g, characterized by excellent side-by-side Method for producing a side bicomponent hollow filament. Two polyester polymers (A, B) having an inherent viscosity difference of 0.26 to 0.38 ㎗ / g are composed of monofilaments arranged side by side type on the cross section of the monofilament, A circular hollow portion C is formed at the center of the cross section of the monofilament with an area of 5 to 30% of the total area of the cross section, and the single yarn fineness of the monofilament is 2.0 to 4.5 denier and the density is 1.30 to 1.35 g / A side-by-side bicomponent hollow filament having excellent crimpability, characterized by cm 2, thermal stress of 0.60 to 0.65 g / d, and thermal shrinkage of 15 to 20%. Knitted fabric using the side by side type bicomponent hollow filament of Claim 4.

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