JP2001355132A - Polyester conjugated fiber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for stably spinning a stretch-back stock yarn equipped simultaneously with a natural fiber like puffy feeling and high bulkiness caused by different crimp-developing properties among single yarns, and a stretching property and tense/stiff feeling by solving the defects in conventional technologies. SOLUTION: This polyester conjugated fiber consisting of a side by side type modified cross sectional yarn consisting of a high viscosity polyester component (A) consisting of a polyethylene terephthalate having >=85 mol% ethylene terephthalate recurring unit and a low viscosity polyester component (B) is characterized by being constitute with >=3 kinds of single yarns having different component-adhering surface states of the high viscosity polyester component (A) with the low viscosity polyester component (B) in the single yarn cross sections, and also the compounding ratios of the each of the single yarns are essentially the same.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyester conjugate fiber, and more particularly to a polyester conjugate fiber having three or more single yarn groups having different composite joint surfaces in a single yarn cross section, and wherein the composite ratio of each single yarn is substantially equal. The present invention relates to a polyester composite fiber having a natural fiber-like swelling feeling, bulkiness and stretchability, and a feeling of tightness and waist by being the same.

[0002]

2. Description of the Related Art Natural fibers typified by silk, wool, and cotton are characterized by large variations in physical properties such as fineness, shape, and crimp development of a single yarn. It is known that the swelling is large and the texture is good as compared with synthetic fibers represented by polyester fibers. For this reason, many proposals have been made for synthetic fibers that are like natural fibers.

For example, Japanese Patent Publication No. Sho 63-30421 discloses that side-by-side type polyester composite fibers using two kinds of polymers having different intrinsic viscosities and having different composite ratios are separately manufactured and mixed and crimped by a heating fluid pushing nozzle. A method for doing so is disclosed. However, the polyester conjugate fiber obtained by this method has a problem in terms of manufacturing cost due to the complexity and complexity of the manufacturing process by blending the filaments obtained separately, and also a single yarn group having different crimp forms. It was difficult to increase the number, and it was difficult to obtain natural fiber-like ones.

Japanese Patent Application Laid-Open No. 1-266220 discloses that when a high-viscosity polyester component and a low-viscosity polyester component are joined in a side-by-side type, the composite ratio differs between single yarns to give a random feeling. Mixing each filament of only viscosity polyester component and low viscosity polyester component, moderate swelling feeling, bulkiness and tension
A method for imparting a feeling of waist is disclosed.

[0005] However, the polyester composite fiber obtained by the method is unstable in yarn-making properties due to the difference in strength and elongation between single yarns, and furthermore, since the yarn itself contains a single yarn having no crimp, The coarse hardness is emphasized. In addition, since the single-component filament of the low-viscosity polyester component is also spun at the same time, the intrinsic viscosity difference between the high-viscosity polyester component and the low-viscosity polyester component cannot be increased from the viewpoint of stabilization, and the swelling feeling with poor crimp development is poor. There was no flat texture.

[0006]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems and provides a natural fiber-like bulge by having three or more single yarn groups each having an irregular cross-section and having different composite joint surfaces between single yarns. The present invention relates to a polyester composite fiber having stretchability, tension, and resilience as well as feeling and bulkiness.

[0007]

As a result of intensive studies to solve the above-mentioned problems, an object of the present invention is to provide a group of three or more polyester single yarns whose polyethylene terephthalate has 85 mol% or more of polyethylene terephthalate repeating units. In the composite fiber, the constituent single yarn is a side-by-side type irregular cross-section yarn of the high-viscosity polyester component (A) and the low-viscosity polyester component (B), the composite ratio is substantially the same, and the single yarn of each single yarn group is This is achieved by a polyester composite fiber characterized in that the composite bonding surface state of the yarn cross section is different.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.

[0009] The polyester conjugate fiber of the present invention is a polyester conjugate fiber in which the ethylene terephthalate repeating unit is 85 mol% or more of polyethylene terephthalate, and comprises a high-viscosity polyester component (A) and a low-viscosity polyester component (B). The composite yarn of the high-viscosity polyester component (A) and the low-viscosity polyester component (B) is substantially the same for each single yarn, and the composite joining surface state of the single yarn cross section is a single yarn. It is necessary to have three or more single yarn groups that differ between them. By using three or more types, it is possible to obtain a natural fiber-like material having excellent swelling and excellent surface quality.

In the side-by-side type irregular cross-section yarn according to the present invention, the composite ratio needs to be substantially the same between the single yarns. When the composite ratio is the same, the variation in the strength and elongation between single yarns can be minimized, and stable yarn production can be performed.

In the polyester composite fiber of the present invention, it is necessary to use a yarn having an irregular cross section as a constituent yarn. By forming a modified cross section, the composite joining surface can be made different between the single yarns, and by forming the modified cross section, different bending stiffnesses work for each single yarn group, thereby obtaining a single yarn group having different crimp expression. . If the cross section is round, the composite joining surfaces between the single yarns are substantially the same, so that the crimped form is also the same.

It is preferable that the degree of cross section irregularity of the modified cross section yarn in the polyester composite fiber of the present invention is in the range of 1.2 to 5. By setting the cross-sectional irregularity within the range of 1.2 to 5, a random feeling of crimp development and functionality can be imparted.

[0013] The cross-sectional shape of the modified cross-section yarn in the present invention is not particularly limited. Unless the object of the present invention is impaired, the cross-section is formed into a modified cross-section to impart functions such as light weight, heat retention, glossiness, and water absorption. You can do it.

The cross-sectional shape of the modified cross-section yarn in the present invention is illustrated in FIG. 1, but is not limited to the illustrated one.

The degree of cross section irregularity defined in the present invention is a value obtained by obtaining a circumscribed circle and an inscribed circle in a single yarn cross section by an electron micrograph, and dividing the diameter of the circumscribed circle by the diameter of the inscribed circle.
The larger the value, the greater the degree of section irregularity.

In the polyester composite fiber of the present invention, the relationship between the maximum fineness Max (dtex) and the minimum fineness Min (dtex) of the single yarn fineness is 1.5 ≦ Max (dtex) / Min (dtex) ≦ 5.
0 is preferably satisfied. Max (dtex) / Min
By setting the (dtex) to 5.0 or less, yarn production can be stably performed, quality and quality are improved, and high-order permeability is improved. Max (dtex) / Min (dtex) is 1.5
With the above, a more natural-like surface quality can be provided.

Further, as long as the object of the present invention is not impaired, isophthalic acid, 5-sodium sulfoisophthalic acid and 2-2bis {4- (β- Even if a copolymer component such as hydroxy) phenyl / propane, a matting agent such as titanium oxide, an antioxidant such as a hindered phenol compound, a pigment, a flame retardant, an antibacterial agent, or a conductivity imparting agent is blended. good.

Next, a method for producing the polyester composite fiber of the present invention will be described. In the method for producing a polyester composite fiber of the present invention, the high-viscosity polyester component (A) and the low-viscosity polyester component are bonded to each other in a side-by-side type using a composite spinning machine, a predetermined composite pack, and a die for a modified cross section. Composite spinning is performed to obtain an undrawn yarn. This undrawn yarn can be drawn by a normal drawing machine to have a predetermined breaking elongation to obtain a polyester composite fiber.

The present invention may be used alone for warp and weft as it is, or may be used by blending with other yarns. In addition, false twisting may be applied, or false twist may be mixed. In addition, a real twist may be provided, a real twist may be mixed, or any combination thereof may be used, and any method that exerts the characteristics of the composite fiber of the present invention may be used.

[0020]

EXAMPLES Hereinafter, the present invention will be described specifically with reference to Examples, but the present invention is not limited to these Examples. In addition, the evaluation method in an Example is as follows. 1. Intrinsic viscosity [η] It is a value measured in orthochlorophenol at 25 ° C. 2. Product texture A sensory evaluation was conducted by five skilled persons, taking into account the appropriate tension, waist and resilience, mainly based on stretchback properties, bulkiness, and surface quality, and evaluated by a four-level evaluation method.

○: Excellent ○: Good Δ: Acceptable ×: Not Acceptable Yarn-making properties The following judgment method was used.

○: Yarn breakage rate of less than 3.0% O: Yarn breakage rate of 3.0% or more and less than 6.0% Δ: Yarn breakage rate of 6.0% or more and less than 10.0% ×: Yarn Cutting rate is 10.0% or more-: Not evaluated Example 1 [η] = 0.68 as high-viscosity polyester component (A)
Of polyethylene terephthalate (PET) of 100% as low-viscosity polyester component (B) [η] = 0.
The cross-sectional shape was changed by changing the die hole specifications as shown in Table 1 using polyethylene terephthalate of 50, and the spinning speed was 1200 m / min with a composite ratio of 50:50.
The composite spinning was performed in a side-by-side type at a winding speed of to obtain an undrawn yarn. This undrawn yarn has a residual elongation of 30.
The stretching heat set was performed to be 0%, and 110 dtex-2
4 fil drawn yarn was obtained. 1000 times /
The plain woven fabric was obtained by using the twisted m for warp and weft. The obtained woven fabric (Level 1) had excellent natural fiber-like surface quality, stretchback properties, bulkiness, tightness, elasticity, and resilience, and also had good spinnability.

Level 2 is an experiment in which the fiber was spun into a five-leaf cross section. The stretch back property, the bulkiness, the surface quality, and the spinning property were good.

Level 3 is an experiment in which the fiber was spun into a round cross section. The stretch back property was excellent, but random crimping was not obtained because the composite joint surface was the same for all single yarns.
No natural fiber-like swelling was obtained.

Level 4 is an experiment in which two types of single yarns having different composite joint surfaces were used. However, since there were only two types of single yarns having different crimp development, the feeling of swelling was insufficient and the surface was natural fiber-like. It did not have a feeling.

Table 1 shows the evaluation results.

[0027]

[Table 1] Example 2 Levels 5 to 8 are experiments in which the cross-sectional irregularity was changed in Example 1 Level 1.

Level 5 is an experiment in which the degree of cross-sectional irregularity is 1.2, and Level 6 is an experiment in which the degree of cross-sectional irregularity is 5.0. Natural fiber-like woven fabrics having excellent stretch-back properties and having firmness and resilience can be obtained. Was done.

Level 7 is an experiment in which the degree of cross-sectional irregularity was 1.1. However, since the degree of cross-sectional irregularity was relatively small, a woven fabric having good bulkiness, good yarn-making properties, and excellent surface quality was obtained.

Level 8 is an experiment in which the degree of cross-sectional irregularity was 5.5, but a natural-like woven fabric having stretchback properties, bulkiness, and rich swelling was obtained.

Table 2 shows the evaluation results.

[0032]

[Table 2] Example 3 In Levels 9 to 12, the maximum fineness Max (dtex) between single yarns and the minimum fineness Min (d
tex).

Level 9 is Max (dtex) / Min (dtex)
The experiment was conducted with the relationship of 5.0, but it was excellent in stretch back property, tension and resilience, swelling like natural fiber,
A woven fabric having a bulky height was obtained.

Level 10 is Max (dtex) / Min (dte
In the experiment in which the relationship of x) was set to 5.5, a woven fabric having good stretch-back property and swelling feeling was obtained.

Level 11 is Max (dtex) / Min (dte
Although the experiment was conducted with the relation of x) set to 1.5, it was excellent in all aspects such as stretch back property and swelling feeling.

Level 12 is Max (dtex) / Min (dte
Although the experiment was conducted with the relationship of x) set to 1.2, a woven fabric having good stretch-back properties, tightness and resilience was obtained.

Table 3 shows the evaluation results.

[0038]

[Table 3]

[0039]

According to the present invention, it is possible to stably produce a stretch-back raw yarn having natural fiber-like swelling feeling, bulkiness and stretchability, and tightness and waistiness, which are different in the crimp expression between single yarns.

[Brief description of the drawings]

FIG. 1 is a view showing one example of a polyester composite fiber of the present invention.

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Claims (3)

[Claims] An ethylene terephthalate repeating unit comprising 8 units
In a composite fiber composed of a group of three or more polyester single yarns of 5 mol% or more of polyethylene terephthalate,
The constituent single yarns are side-by-side type irregular cross-section yarns of the high-viscosity polyester component (A) and the low-viscosity polyester component (B), and the composite ratio is substantially the same, and the composite of the single yarn cross section of each single yarn group A polyester composite fiber having a different bonding surface condition. 2. The polyester composite fiber according to claim 1, wherein the single yarn has a degree of irregularity in cross section of 1.2 to 5. 3. The polyester composite fiber according to claim 1, wherein the single yarn fineness differs between the single yarns, and the relationship satisfies the following expression. 1.5 ≦ Max (dtex) / Min (dtex) ≦ 5.0 where Max (dtex) is the maximum fineness (dtex) between single yarns, and Min (dtex) is the minimum fineness (dtex) between single yarns.