JPH1072723A - Polyester irregular cross section fiber and pile fabric - Google Patents

Abstract

(57) [Summary] [Problem] It has a soft and supple texture.
Provided is a pile fabric which has excellent elastic recovery without causing hair fall and has gloss without white blurring, and a fiber having an irregular cross section from which such a pile fabric can be obtained. SOLUTION: The cross-sectional shape is substantially triangular, each side has a convex portion satisfying the following (1) to (2), and the longest length L among the lengths connecting the vertex of the triangle and the center of gravity is provided. ₁
And the ratio L ₁ / L _{2 of} the shortest length L ₂ to the shortest length L ₂ is 3 or less,
Polyester modified cross-section fiber containing 0.3 to 10% by weight of inorganic fine particles. 1 ≦ n ₁ , n ₂ , n ₃ ≦ 2 (1) 1.0 ≦ H ₂ / H ₁ ≦ 1.3 (2) n ₁ , n ₂ , n ₃ : convexes present on each side of the triangle The number of parts H ₁ : the length of a perpendicular line drawn from the center of gravity of the triangle to the tangents that are in contact with the two vertices of the triangle H ₂ : the vertex of the convex part existing on the side connecting the two vertices drawn with the above tangents And the length connecting the center of gravity of the triangle

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pile fabric used for the interior of a vehicle or the like, and to a fiber having an irregular cross section constituting the pile fabric.

[0002]

2. Description of the Related Art Pile fabrics using synthetic fibers such as polyester, nylon and acrylic are widely used for interiors of vehicles. Requested. However, in particular, polyester fibers have a high gloss because the fiber surface is smoother than natural fibers, and pile fabrics made of polyester fibers have a problem that white blurring that appears partially white depending on the viewing direction and angle appears strongly. Was.

In order to solve such a problem, various modified cross-section fibers and a pile fabric using the fibers have been proposed so as not to cause unevenness in the gloss of the fiber surface. Japanese Patent Application Laid-Open No. 4-240246 proposes a pile fabric using a flat cross section fiber having a convex portion. Since such a pile fabric uses flat cross-section fibers, there is a problem that elastic recovery when the pile is compressed is inferior, and a white blur feeling appears strongly. In addition, the interior material of automobiles is required to be free from hair breakage, especially at high temperatures (80 ° C). However, since the cross-sectional shape of the fiber is flat, it easily buckles and deforms in the short axis direction. There was a problem that hair fell.

In order to prevent the hair from falling down, it is conceivable to increase the density of the fibers constituting the pile fabric or to increase the rigidity of the fibers. When the rigidity is increased, the feel and texture of the fabric deteriorate, and there is a problem that the sense of quality is impaired.
In addition, there is a problem that an increase in the fiber density inevitably leads to an increase in cost.

Japanese Patent Publication No. 42754/1972 discloses a fiber having a substantially triangular cross-section comprising three projecting portions.
A modified cross-section fiber having a convex portion on each side of these triangles has been proposed. However, since the shape of the discharge hole of the mouthpiece for obtaining the fibers has a slight swelling between the three protruding portions forming the protruding portions, the obtained fibers are formed on each side. The projections are small. Therefore, the pile fabric obtained from such modified cross-section fibers did not have a sufficiently suppressed white blur.

[0006]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems and has a soft and supple texture.
In addition, without hair fall, excellent elastic recovery,
It is an object of the present invention to provide a pile fabric having a gloss without a white blur and a fiber having an irregular cross section capable of obtaining such a pile fabric.

[0007]

Means for Solving the Problems The present inventors have assiduously studied to solve such a problem, and have reached the present invention. That is, the first invention of the present invention provides a polyester modified cross-sectional fiber having a substantially triangular cross-sectional shape, having a convex portion satisfying the following (1) to (2) on each side,
The ratio (L ₁ / L ₂ ) of the longest length (L ₁ ) and the shortest length (L ₂ ) of the length connecting the vertex of the triangle and the center of gravity
Is 3 or less and contains 0.3 to 10% by weight of inorganic fine particles. 1 ≦ n ₁ , n ₂ , n ₃ ≦ 2 (1) 1.0 ≦ H ₂ / H ₁ ≦ 1.3 (2) n ₁ , n ₂ , n ₃ : convexes present on each side of the triangle Number of parts H ₁ : The length of a perpendicular drawn from the center of gravity of the triangle to the tangents in contact with the two vertices of the triangle H ₂ : The vertex of the convex part existing on the side connecting the two vertices drawn with the above tangents The second invention of the present invention provides a pile fabric comprising a spun yarn containing 50% by weight or more of the above-mentioned polyester modified cross-section fiber.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail. The polyester fiber of the present invention is preferably made of polyethylene terephthalate or polybutylene terephthalate, but may be a copolymer of the third component as long as the effects of the present invention are not impaired. As copolymerization components, aromatic dicarboxylic acids such as isophthalic acid and naphthalenedicarboxylic acid, adipic acid, sebacic acid,
Aliphatic dicarboxylic acids such as azelaic acid, diol compounds such as diethylene glycol and 1,4-butanediol,
Oxy acids such as p-oxybenzoic acid and β-hydroxyethoxybenzoic acid can be exemplified. In addition, these polymers may contain a flame retardant, a deodorant, an antibacterial agent, a light resistance agent, and the like, as necessary.

First, the modified cross-section fiber of the present invention must contain 0.3 to 10% by weight, preferably 0.5 to 2% by weight of inorganic fine particles. That is, in order to have a high-grade gloss when made into a fabric,
Since it is necessary to increase light diffusion, inorganic fine particles are contained as described above. The inorganic fine particles are not particularly limited as long as they can diffuse light, but titanium dioxide, silicon dioxide, aluminum oxide and the like are preferably used.

When the content of the inorganic fine particles is less than 0.3% by weight, the specular reflection on the fiber surface becomes high, and when the fabric is used, a white blur is generated, resulting in a fabric having a poor sense of quality. If the content of the inorganic fine particles exceeds 10% by weight, the fiber formability becomes poor, and furthermore, the abrasion of the equipment occurs during the spinning process and post-processing, and the productivity deteriorates. It is preferable to use inorganic fine particles having an average particle diameter of 1 μm or less.

Next, the shape of the irregular cross-section fiber of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory view showing one embodiment of the modified cross-section fiber of the present invention. FIG.
(C) is a cross-sectional schematic diagram showing an embodiment of the modified cross-section fiber of the present invention.

First, the modified cross-section fiber of the present invention has a substantially triangular cross-sectional shape, and has a convex portion on each side. The number of these convex portions a ₁ , a ₂ , a ₃ is 1 to ₃ . There are two. If there are no convex portions, the sides become flat, so that the reflection of light becomes too large, and the resulting fabric has a feeling of white blur.
When the number of the convex portions is three or more, it is difficult to form the convex portions, and the sides become almost flat, and the obtained fabric has a white blurred feeling.

From the center of gravity G of the triangle, the 2
Of the perpendicular T drawn to the tangent S tangent to the top
₁ and the ratio of the convex portion a ₁ vertex and length H ₂ connecting the center of gravity G of the triangle that exist between the two top minus the tangent S of the above, in H ₂ / H ₁ is from 1.0 to 1.3 It is necessary to be.
When the ratio of H ₂ / H ₁ is less than 1.0, the size of the projections becomes small, the apexes of the triangle become projections, and the texture of the obtained fabric is impaired, and white blur is produced. . When H ₂ / H ₁ exceeds 1.3, the cross-sectional shape becomes close to a circle, and the obtained fabric does not have the desired texture.

Further, the ratio L ₁ / L _{2 of} the longest length L ₁ and the shortest length L ₂ among the lengths L connecting the apex of the triangle and the center of gravity G needs to be 3 or less. is there. L ₁ /
When L ₂ is larger than 3, the cross-sectional shape approaches a flat shape, and as described above, it is easily buckled and deformed in the short axis direction. Will have poor elastic recovery. L ₁ / L
_As the ratio of ₂ approaches 1, it becomes difficult to bend, and the obtained pile fabric is excellent without hair falling.

The pile fabric of the present invention comprises a spun yarn containing 50% by weight or more of the polyester modified cross-section fiber of the present invention. A pile fabric made of a spun yarn having a modified cross-section fiber content of less than 50% by weight does not have a soft and supple texture, and causes hair breakage and white blurring. Other fibers that can be mixed with the polyester modified cross-section fiber of the present invention are not particularly limited, but synthetic fibers such as polyester, nylon, and acrylic, and natural fibers can be used. The cross-sectional shape of such another fiber is preferably a circle or a triangle, so long as it does not impair the effect of the modified cross-section fiber of the present invention.

In the pile fabric of the present invention, it is preferable to use fibers having a monofilament fineness of 2 to 6 denier, and more preferably 3 to 5 denier among the modified cross-section fibers of the present invention. preferable. When the single fiber fineness is less than 2 denier, the rigidity is reduced, and the pile fabric is likely to have fallen hair. When the single fiber fineness exceeds 6 denier,
Although the obtained pile fabric is less likely to fall down, the rigidity is increased and the texture is likely to be reduced.

As a method for producing the modified cross-section fiber of the present invention, in order to produce fibers having the shapes shown in FIGS. 2 (a) to 2 (c), first, FIGS. 3 (a) to 3 (c) are respectively shown. Using a spinneret having such a hole shape, melt spinning is carried out at a temperature of 270 to 300 ° C. using a usual melt spinning apparatus, and is drawn at a speed of 700 to 1500 m / min to obtain an undrawn yarn. Next, the undrawn yarn was bundled into an undrawn tow of 100,000 to 300,000 denier, drawn at a drawing temperature of 50 to 70 ° C, and subsequently heat-treated at 150 to 200 ° C using a heating device such as a heat drum. Thereafter, a method of applying a mechanical crimp and cutting to a desired length for production is exemplified.

The physical properties of the modified cross-section fiber of the present invention are not particularly limited, but the strength is preferably about 4.5 to 5.5 g / d and the elongation is about 30 to 50%. When the dry heat shrinkage (170 ° C. × 15 minutes) is about 2 to 4%, the obtained pile fabric is excellent in strength and shape stability, which is preferable.

In order to produce the pile fabric of the present invention, it is mixed with other fibers so that the content of the polyester modified cross-section fiber of the present invention becomes 50% by weight or more, and then mixed with a blending cotton mill. Alternatively, using only the modified cross-section fiber of the present invention, a spun yarn having a desired cotton count is formed by a usual spinning method, and after forming a twin yarn, a pile fabric is manufactured by a usual method.

[0020]

Next, the present invention will be described in detail with reference to examples. In addition, each evaluation in an Example was performed as follows. (1) Texture The texture of the obtained pile fabric was determined by the tactile sensation according to the following criteria. ○ Soft △ Slightly hard × Hard (2) Hair fall With a load (500 g) with a diameter of 40 mm imprinted on the pile fabric, leave it in a constant temperature bath at 80 ° C for 2 hours, then immediately remove the load and remove it. Immediately after that, in a place where the direction of the light beam is constant, the degree of pile deformation of the portion where the load was impressed was compared with that of the portion where no load was applied, and evaluated according to the following criteria. At this time, the evaluation was performed at four locations while moving the fabric of the portion on which the load was applied by 90 degrees on a plane. ○ There is no difference from the no-load part in all four places, and there is no hair fall. △ Hair breakage occurred in 1 or 2 places. × Hair fall has occurred at 3 to 4 places. (3) White blur feeling With a load (500 g) with a diameter of 40 mm imprinted on the pile fabric, the pile was left in a constant temperature bath at 80 ° C for 2 hours, then the load was immediately removed, and the pile fell immediately after being removed. Observe the pile fabric surface from the direction opposite to the direction the tip of
The white sensation of the pile fabric was visually evaluated according to the following criteria. ○ Not at all △ Slightly white blurred × Strong white blurred (4) Wear in spinning process In a normal spinning process, the presence or absence of abrasion of a guide, a traveler or the like was visually determined according to the following criteria. ○ Not at all △ Some wear × Many wear

Examples 1-4, Comparative Examples 1-5 Intrinsic viscosity containing 0.5% by weight of titanium dioxide (measured at 20 ° C using a mixed solvent of an equal weight of phenol and ethane tetrachloride) 0.68, melting point 256 ° C After drying the polyethylene terephthalate (PET) chips under reduced pressure by a conventional method, the spinning temperature is 290 ° C. and the discharge amount is 2 using an ordinary melt spinning apparatus.
Melt spinning was performed at 97 g / min, and an undrawn yarn was obtained at a take-up speed of 1000 m / min. The obtained unstretched yarn was bundled into a 100,000-denier unstretched tow, stretched normally at a draw ratio of 3.3 and a stretching temperature of 60 ° C. to give a stretched tow. After a heat treatment at a temperature of ° C., a mechanical crimp was applied and the fiber was cut into a fiber length of 76 mm to obtain a fiber having a single fiber fineness of 4 denier. At this time, various shapes of irregular cross-section fibers were obtained by using spinnerets having different hole shapes. Table 1 shows the cross-sectional shape of the obtained fiber.

Examples 5 to 8 The same procedures as in Example 1 were carried out except that the fineness of the monofilament fibers was changed as shown in Table 1. Table 1 shows the cross-sectional shape of the obtained fiber.

Example 9 and Comparative Examples 6 and 7 The same procedure as in Example 1 was carried out except that the content of titanium dioxide was changed as shown in Table 1. Table 1 shows the cross-sectional shape of the obtained fiber.

[0024]

[Table 1]

Example 10 Spinning and drawing were performed in the same manner as in Example 1 except that a PET chip having an intrinsic viscosity of 0.68 and a melting point of 256 ° C. was used as the other fiber and a spinneret having a round cross-section was used. Then, heat treatment was performed to obtain PET fiber (round cross section) having a fiber length of 76 mm and a single fiber fineness of 4 denier. The PET fiber and the modified cross-section fiber obtained in Example 1 are blended using a blending cotton wool machine so that the content of the modified cross-section fiber becomes 60% by weight, and the cotton count is increased to 20 by a normal spinning method. The yarn was dyed into a twin yarn, and the dyed yarn was warp density 24 yarns / 2.54 cm, weft yarn density 45 yarns / 2.54
A pile fabric was obtained under the conditions of cm and a pile length of 2.5 mm. Table 2 shows the properties of the obtained pile fabric.

Examples 11 to 21 and Comparative Examples 10 to 15 Pile fabrics were obtained in the same manner as in Example 10, except that the type and content of the modified cross-section fibers used were variously changed as shown in Table 2. Table 2 shows the properties of the obtained pile fabric.

[0027]

[Table 2]

As is apparent from Table 2, the pile fabrics of Examples 10 to 21 use the modified cross-section fibers of the present invention shown in Examples 1 to 9, and the content of the modified cross-section fibers of the present invention is also different. Since it was within the range, the texture was good, and there was no white blurring and no hair falling, and the product was good. On the other hand, in the pile fabric of Comparative Example 8, since the content of the irregular-shaped cross-section fiber was less than 50% by weight, the influence of the irregular-shaped cross-section fiber became small, hair fell off, and a white blur was felt. The pile fabric of Comparative Example 9 was inferior in texture and had a feeling of white blur, since the irregular cross-section fiber having no convex portion on one side of the triangular shape was used.
Since the pile fabric of Comparative Example 10 used irregularly shaped cross-section fibers having three or more convex portions on one side of the triangular shape, the shape of the triangular sides became nearly flat, and the texture was inferior and white blurred. Was. The pile fabric of Comparative Example 11 had H ₂ / H _1.
Since the irregular cross-section fiber smaller than 1.0 was used, the size of the projection became smaller, and the apex of the triangle became a projection,
The texture is impaired, and a white blur is generated. Since the pile fabric of Comparative Example 12 had a modified cross-section fiber having an H ₂ / H ₁ of greater than 1.3, the cross-section shape was a fiber having a shape close to a circle, the texture was inferior, and hair fell. Comparative example
The pile fabric of _No. 13 uses fibers of irregular cross-section in which L ₁ / L ₂ exceeds 3, so that the cross-sectional shape becomes almost flat, and the bending direction of the fiber has directivity in the short axis direction, and What happened. The pile fabric of Comparative Example 14 had an irregular cross-section fiber in which the amount of titanium dioxide added was less than 0.3% by weight, so that the fabric had a feeling of white blur. Comparative Example 15
Due to the use of irregularly shaped fibers with an added amount of titanium dioxide exceeding 10% by weight, yarn breakage occurs due to wear of the traveler in the spinning process, resulting in deterioration of operability and yarn quality, and the obtained pile fabric has poor texture. Met.

[0029]

By using the modified cross-section fiber of the present invention, it is possible to obtain a pile fabric which has a soft and supple texture, does not cause hair breakage, has excellent elastic recovery properties, and has gloss without white blurring. It can be suitably used as pile fabric for interior of vehicles and the like.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing one embodiment of a modified cross-section fiber of the present invention.

FIGS. 2 (a) to 2 (c) are cross-sectional explanatory views showing an embodiment of a modified cross-section fiber of the present invention.

3 (a) to 3 (c) are explanatory views showing the hole shapes of a spinneret for producing the modified cross-section fiber of FIG. 2;

[Explanation of symbols]

a ₁ , a ₂ , a ₃ Convex parts existing on each side of triangle G

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical display location // D01D 5/253 D01D 5/253

Claims (3)

[Claims] 1. A modified polyester fiber having a substantially triangular cross-sectional shape, having a convex portion satisfying the following (1) to (2) on each side and connecting a vertex of the triangle to a center of gravity. is the longest length (L ₁₎ and the shortest length (L ₂₎ and the ratio of (L ₁ / L ₂₎ is 3 or less, and characterized in that the inorganic fine particles containing 0.3 to 10 wt% Polyester irregular cross section fiber. 1 ≦ n ₁ , n ₂ , n ₃ ≦ 2 (1) 1.0 ≦ H ₂ / H ₁ ≦ 1.3 (2) n ₁ , n ₂ , n ₃ : convexes present on each side of the triangle Number of parts H ₁ : The length of a perpendicular drawn from the center of gravity of the triangle to the tangents in contact with the two vertices of the triangle H ₂ : The vertex of the convex part existing on the side connecting the two vertices drawn with the above tangents And the length connecting the center of gravity of the triangle 2. A pile fabric comprising a spun yarn containing the polyester modified cross-section fiber according to claim 1 in an amount of 50% by weight or more. 3. The pile fabric according to claim 2, wherein the monofilament fineness of the polyester modified cross-section fiber is 2 to 6 denier.