KR20040000121A - Manufacturing method of polyester divided yarn having latent crimping - Google Patents

Abstract

PURPOSE: Provided is a polyester yarn with a potential crimp characteristic which is made without forming crimps using a separate drawing machine while involving excellent spinning capacity, and prevents the deterioration in the spinning workability due to the snarls at a lower cost. CONSTITUTION: A polyester yarn is manufactured by spinning a mother yarn based on two kinds of thermoplastic polymers(2,3) with different intrinsic viscosities and shrinkages, using side by side composite spinnerets. The polymers are polyethylene terephthalate differentiated in the intrinsic viscosity by 0.05-0.35, or one of the polymers is a reformed copolymer of polyethylene terephthalate based on isophthalic acid, dimethyl sulfonate, or polyethyleneglycol.

Description

Manufacturing method of polyester divided yarn having latent crimping characteristics {Manufacturing method of polyester divided yarn having latent crimping}

The present invention relates to a method for producing a polyester powder spun yarn having latent crimping properties. More specifically, two types of thermoplastic polymers having different intrinsic viscosities and heat shrinkage characteristics are used by using a conventional compound spinning machine. It relates to a polyester spun yarn obtained by drawing and heat-setting a mother yarn obtained by the composite spun yarn in the form of). The present invention relates to a method for producing a latent crimped divided yarn having crimping properties without additional flammable heat treatment by wet or dry heat treatment such as a machining process.

In the conventional manufacturing method of the divided fiber having crimp characteristics, the conventional divided fiber is sprayed after the crimp is applied using a separate combustor, so that the spray is performed in the state where the crimp is applied after the combusting, so that the spraying work is performed by the crimping twist. When the castle is markedly degraded and the crimp is applied, the thermoplastic fiber yarn is circularized using a conventional pin type combustor or circular knitting machine as a combustor, heat-fixed, and then loosened again. Knit-de-knit, which has the crimp characteristics as it is, has a problem in that the production speed is very low and the manufacturing cost is extremely expensive.

In the case of the latent crimped fiber according to the present invention, sufficient crimp expression is achieved even without a separate twisting process, and since the crimp is not given when spraying, it may have excellent spraying properties, and the body penetrability or flammability when weaving a normal woven fabric By eliminating the twisting snarl phenomena, not only can we improve the fabrication, but we can also reduce the manufacturing cost by omitting the combustion process, and we can expect the effect of replacing the existing combustible powdered yarn.

The present invention solves the problems of lowering production efficiency, reducing manufacturing cost, and post-processing performance of the conventional combustible screw thread as described above, and providing a method for manufacturing spontaneous crimp screw thread having excellent crimping characteristics and excellent spinning performance. Let that be the technical problem.

1 is a schematic cross-sectional view of a conventional combustible divided thread,

(A) is the cross-sectional shape of yarn, and (b) is the cross-sectional shape after burning.

2 is a schematic cross-sectional view of the latent crimping thread of the present invention,

(A) is a cross-sectional form of yarn, and (b) is a cross-sectional form after heat treatment.

Figure 3 is a schematic diagram of the longitudinal direction of the present invention crimped yarn.

4 is a schematic view of the composite spun detention of the present invention.

※ Explanation of Codes on Major Parts of Drawings

1, 1 ': flammable powder fine yarn 2: first component

3: second component 4: composite spinneret

The present invention in order to impart crimping properties without going through a separate combustion process

Preparation of latent crimping yarn for composite spinning of two kinds of thermoplastic polymers with different viscosity characteristics and heat shrinkage in the form of side-by-side, and expressing the crimp characteristics by dry heat and wet heat in the post process due to the difference in orientation and crystallinity during spinning. The method is characterized by that.

Hereinafter, the present invention will be described in more detail.

The two types of fiber-forming polymers used in the present invention have mutual affinity, and those in which both of the polymers have a higher viscosity characteristic and a higher thermal shrinkage than one component are used.

The thermoplastic polymer used in the present invention is a conventional polyethylene terephthalate and the third component isophthalic acid (isophthaic acid), modified BPA, polyethylene glycol,

Dimethylsulfonic acid (dimethylsulphonate) was used, and polymers having different IVs from each other also used in conventional polyethylene terephthalate.

The cross sectional area ratio between the two components was 1: 9 to 5: 5 to evaluate the potential crimp characteristics and radioworkability. 3: 7 to 5: 5 are preferable.

In the present invention, the physical properties of the yarn was evaluated by the following method.

(1) crimp characteristics:

C. C. (crimp concentration) and C. D. (crimp durability) values were measured ten times using a conventional twisted yarn crimping characteristic and evaluated as the average values.

(2) Radioactive:

The 9-kg package was measured at% unloading rate when producing 500 pieces.

(3) Spraying workability:

9 Kg Package Trimming rate (%) when spraying 200 yarns

Was measured.

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

Polyethylene terephthalate (first component) having an intrinsic viscosity of 0.5 and a polyethylene terephthalate (second component) having an intrinsic viscosity of 0.7, prepared by a conventional method, have a cross-sectional area ratio between the first component and the second component. 5: The discharge amount is adjusted to be 5, and the solidification is performed while spinning at 1300m / min in the form of side by side in the form of single yarn fineness 20 denier (200de / 10f). After stretching to a draw ratio of 3.07 and heat-setting to 130 ℃ heat, it was wound up under appropriate winding conditions. Table 1 shows the results of evaluating the crimping characteristics after spraying with mono yarns through the usual injector with this yarn.

Comparative Example 1

Table 1 shows the results of evaluating the crimp characteristics after injecting the yarn obtained in the same manner to a mono yarn through a conventional injector except that the cross-sectional area ratio was 1: 9 as compared with Example 1.

Comparative Example 2

As in Example 1, except that a copolymer of polyethylene terephthalate having an intrinsic viscosity of 0.65 and an isophthalic acid as a second component was used, a different copolymer-modified polyethylene terephthalate having a two-fold level of heat shrinkage was used. Table 1 shows the results of evaluating the crimping characteristics after spraying the mono yarns with a yarn obtained by using a conventional injector.

Comparative Example 3

Example 1 except that copolymer modified polyethylene terephthalate having different viscosity characteristics obtained by copolymerizing polyethylene terephthalate having an intrinsic viscosity of 0.65 as a first component and dimethyl sulfonate and polyethyleneglycol as a second component was used. Table 1 shows the results of evaluating the crimping properties after the yarn obtained in the same manner was sprayed into a mono yarn through a conventional injector.

Comparative Example 4

Except for using polyethylene terephthalate having an intrinsic viscosity of 0.65 as the first component and polytrimethylene terephthalate having an intrinsic viscosity of 1.0 as the second component, the yarn obtained in the same manner as in Example 1 was subjected to a conventional injector. Table 1 shows the results of evaluating the crimp properties after spraying with mono.

Comparative Example 5

Polyethylene terephthalate of 0.65 intrinsic viscosity is directly spun to 20 denier (200de / 10f) of single yarn fineness to obtain a mother yarn, which is then crimped with a normal pin-type combustor. Table 1 shows the results of evaluating the crimping characteristics after spraying using a conventional spraying plant to obtain 20 denier / filament (20de / 1f) combustible divided yarns.

division Crimp characteristics Radioactive Injection workability Remarks CC CD Example 1 59.42 17.42 96% 97% Comparative Example 1 19.84 3.24 96% 95% Comparative Example 2 57.49 15.24 94% 96% Comparative Example 3 55.76 14.17 95% 97% Comparative Example 4 60.12 19.24 92% 95% Comparative Example 5 32.14 10.34 98% 75%

Polyester spun yarn having the potential crimping characteristics of the present invention has excellent spraying property because it omits the procedure of imparting crimping by using a separate combustor, and prevents a decrease in spraying workability due to crimping and twisting during spraying. As a result, it has the effect of improving the knitting performance and reducing the manufacturing cost of the divided fiber.

Claims (7)

It is characterized by spinning the yarn by using a composite spinneret of side by side type using two kinds of thermoplastic polymers having different intrinsic viscosity and shrinkage by using a conventional composite spinning equipment. The manufacturing method of the polyester powder spun yarn to be made. The method according to claim 1, 1. A method for preparing polyester spun yarn, characterized in that one component of two kinds of thermoplastic polymers uses polyethylene terephthalate having a difference in intrinsic viscosity in the range of 0.05 to 0.35. The method according to claim 1, 1. A method for preparing a polyester powdered yarn, wherein one component of two kinds of thermoplastic polymers is copolymer-modified isophthalic acid to use modified co-polymerized polyethylene terephthalate having different shrinkage rates. The method according to claim 1, One component of the two thermoplastic polymers copolymerizes dimethyl sulfonate alone or polyethyleneglycol to use modified co-polymerized polyethylene terephthalate having different intrinsic viscosity to different shrinkage rates. Manufacturing method. The method according to claim 1, A method for producing a polyester powdered yarn, wherein one component of two kinds of thermoplastic polymers uses polytrimethyleneterephthalate. The method according to claim 1, A single yarn fineness of mother yarn is 5 to 50 denier. The method according to claim 1, A cross-sectional area ratio of a first component and a second component of a thermoplastic polymer having different intrinsic viscosity and shrinkage is in a range of 2: 8 to 5: 5.