JPH0319908A - Fiber having modified cross-section - Google Patents

Abstract

PURPOSE:To provide the subject fiber giving mild and deep luster and soft and smooth feeling and having an elliptic cross-section having a center axis and plural protrusions on both sides of the axis, wherein the distance between the tips of the protrusions is longest at the center part and becomes short toward both ends. CONSTITUTION:A molten polyethylene terephthalate, etc., is extruded through a spinneret having 500 nozzles each having an area of 0.16mm<2> and composed of a combination of linear slits. The extruded polymer is taken up under cooling with cooling air blasted against the extrudate, collected in the form of a tow, drawn, imparted with mechanical crimps, heat-treated and cut to obtain the objective fiber having an elliptic cross-section having a center axis and 4-6 protrusions on each sides of the axis, wherein the distance between the opposite tips of the protrusions is longest at the center part, becomes short toward both ends of the center axis and satisfies the formula (l1 is distance between the tips of the central protrusions; l2 is distance between the tips of the protrusions at the end part of the center axis; l3 is length of the major axis of the ellipse).

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention is directed to special cross-section fibers, especially special cross-section I! fibers suitable for moquettes, high bails, etc. Regarding maintenance.

[Prior Art] Conventionally, synthetic LLI fibers such as polyester and nylon having round or flat cross sections have been used in applications such as moquettes and high piles. In particular, flat cross-section fibers are often used to express a soft texture.

However, moquettes, high piles, etc. that use round cross-section or simple flat cross-section fibers have a so-called "glitter" effect due to the reflection of light on the smooth $ii1 surface, or a so-called "whitish feeling" that partially looks whitish depending on the viewing direction.
The problem was that a strong artificial luster appeared, detracting from the sense of luxury. As a countermeasure against this problem, fibers with irregular cross sections, particularly fibers with polygonal cross sections as shown in FIGS. 4(a) to (c), have been proposed.

However, with these polygonal cross-section fibers, the change in the undulation of the surface unevenness is small, and the improvement effect is small.
It has not been possible to obtain a textile product that has a gentle, deep luster and a soft texture. In other words, it has not been possible to obtain textile products such as moquettes and high piles that exhibit a gentle, deep luster and also have a soft and smooth texture and appearance from conventionally used synthetic fibers. It is.

[Problems to be Solved by the Invention] In order to solve the above-mentioned problems with the gloss, texture, and appearance of synthetic fibers, the present inventors have conducted extensive studies on the relationship between these properties and the fiber cross section, and have developed the present invention. It has come to this.

In other words, the objective of the present invention is to create a gentle, deep and excellent gloss, as well as a soft and smooth texture and appearance that cannot be obtained with conventional synthetic fibers! Do it! Our goal is to provide textile products. Another object of the present invention is to provide fibers for moquettes and high piles that exhibit gentle, deep and excellent gloss, and soft and smooth texture and appearance.

[Means for Solving the Problem] The above problem of the present invention is that the m-fiber cross section has one central axis,
It is an elliptical fiber having 4 to 6 protrusions on each side of its central axis, and the distance between the vertices of the substantially opposing protrusions is longest at the center, and as it goes toward both ends of the central axis. In the shortened shape, when the distance between the vertices of the central convex portion is l1, the distance between the apexes of the endmost convex portion of the central axis is Jl2, and the long axis distance of the ellipse that is the central axis is 13. Q1,. 11
2 and 13 are 11:! This problem can be solved by using a special cross-section fiber that satisfies the following: J2:l3=1:0.5-1.0:1.5-4.0.

That is, the special cross-section fiber of the present invention (hereinafter simply referred to as the fiber of the present invention) has a fiber cross section with 4 to 6 convex portions on each side of the central axis, as shown in Fig. 1 (A) to (E). It is characterized by its elliptical shape.

The convex portions of this fiber cross section may be symmetrical or asymmetrical with respect to the central axis, but the number of convex portions on both sides of the central axis is 4 to 4 on each side.
Must be 6 pieces. That is, when the number of convex portions is three or less, the "sparkling feeling" cannot be sufficiently eliminated due to surface reflection of light. Furthermore, if the number of convex portions is seven or more, the undulations of the concave and convex portions become small, and desirable gloss and texture cannot be obtained.

Note that the number of convex portions does not necessarily have to be the same on both sides of the central axis.

Further, in this convex part, the distance between the vertices of the central convex part, the distance between the apexes of the most convex part g2, and the length of the central axis of the ellipse, that is, the major axis distance D3 are u1 : u2 : . Q3=1:0.5-1.0:1.5-4.0 Preferably. 111:fJ2:. It is important to satisfy the following relationship: ll3=1:0.6-0.9:2.0-3.5.

If the relationship between n1, p2 and fJ3 is out of the above range, the fiber will not have a gentle, deep luster and a soft texture.

For example, the above. I! The relationships between numbers 1 and 13 are as follows. 1) 1:. l! 2:J)3=1:0.5~1.0:When the ratio of 13 is outside the specified range, the undulations of the uneven portions on the fiber surface disappear, It is not desirable in terms of gloss and texture.

Also, . 111:. Il2:. Q3=1:0.5~1. When the ratio of p3 is large, such as O:5 or more, the fiber has a large cross-sectional aspect ratio, resulting in a texture that is too soft, and on the other hand, even on the glossy surface, a strong "white blur" feeling is undesirable. In addition, as mentioned above. 11,. p2 and 1. In the relationship 1!3, if the convex portions on both sides of the central axis of the fiber cross section are arranged asymmetrically, then Fig. 1 (2), (E)
As shown in , the two vertices of the central convex part are connected, the distance between them and the vertex of the opposite convex part is 11, and ρ2 is also . I! It may be handled as shown in the figure in accordance with 1.

Examples of the polymer constituting the fiber of the present invention include melt-spun thermoplastic linear polymers such as polyester and nylon. Among these, polyethylene terephthalate and polybutylene terephthalate are preferred. These polymers optionally contain isophthalic acid, 5-
Sodium sulfoisophthalate, polyethylene glycol. Add a third component such as polytetramethylene glycol to 1
It may also be a copolymer of at least several types. Also matting agent, inorganic fine particles. A flame retardant or the like may be mixed. Especially for polymers as a matting agent, TiO
It is desirable to use about 0.05 to 1.0% by weight of 2 in terms of gloss of the fibers.

In order to produce the fiber of the present invention from the above polymer, a spinneret with a hole shape of 1 as shown in Figs. 2 and 3 (A) is used.
A slit with a length L is formed with the central axis of the book, and 4 to 6 lengths approximately perpendicular to the slit 1, mouth, and eyes. Using a special spinneret consisting of a combination of slits, the spun yarn is cooled by blowing cooling air from a position 20 to 100M directly below the spinneret.
A common method is to then carry out normal stretching. At this time, if the cooling position of the spun yarn is closer to the spinneret surface than 20a++, yarn breakage etc. will occur frequently and the operation will become unstable. On the other hand, 10
If it is further away from 0all, the unevenness on the surface of the fiber tends to become broad, which impairs the improvement in the gloss of the fiber, which is not preferable.

Of course, the fiber of the present invention is not limited to the above manufacturing method.

[Example] Hereinafter, the present invention will be specifically explained with reference to Examples.

In addition, each measurement value in this example was measured by the following method.

Intrinsic viscosity [η]: A sample was dissolved in Ortalk oral phenol and measured at 30°C.

Moquette "glitter": The number of "sparkles" per unit CUt was counted using a magnifying glass while the moquette was irradiated with light from a parallel light lamp.

4.9 pieces/ci or less; 0 5.0 to 9.9 pieces/crA'', Δ 10 pieces/ci or more; 0 4-6 or more people judged that there was no defect; △ 3 or less people judged that there was no defect; X Example 1 The intrinsic viscosity [η] was 0.63 dl/g, and TiQ2 Contained f
A polyethylene terephthalate melt having a fi of 0.40% by weight was prepared with a pore shape composed of a combination of linear slits as shown in Figure 2 (a), and a pore area of 0.16#ll+1.
” using a cap with 500 pores,
0In! Cooling air at 20°C was blown at 20 m/min from around the spun yarn loop from the ri position, and the take-up speed was 1100 TrL/min.
I picked it up in minutes. The spun yarns were then converged to form a tow, drawn by a conventional method, mechanically crimped, heat treated, and cut to obtain staple fibers with a fineness of 2.5 denier and a fiber length of 51 Nn.

The cross section of the obtained stable fiber is as shown in Figure 2 (opening), and the distance between the vertices of the convex portions is longest at the center and becomes shorter toward both ends of the central axis of the fiber cross section.
The relationship between Nl, J2 and ρ3 is as follows. 1!1:. l! 2:J)3=1:0.8~0
．． 9:2.6-2.8.

This stear fiber was spun, doubled, and twisted by a conventional method to obtain a spun yarn of cotton count No. 20 double yarn.

After soft rewinding this spun yarn using a conventional method, it is dyed, and then pile date 3009/T is produced using a double loom.
Ii, a moquette with a pile height of 3.0 m was produced.

As shown in Table 1, the obtained moquette had good gloss and softness such as "glitter" and "white blur".

Example 2 A polyethylene terephthalate melt having an intrinsic viscosity [η] of 0.63 dl/g and containing 110.40% by weight of Tto2 was prepared with a cross-sectional shape as shown in FIG. Figure 3 (mouth) was prepared in the same manner as in Example 1 except for using a die having 500g of pores with a size of .13 m2.
With the cross-sectional shape of 11. ．． l! 2 and p3 is Nl:N2:. l! 3 = 1:0.6~0.7:3.1~3.4, fineness 2.5 denier, fiber length 51! rI! A staple fiber of Ii was produced.

Using this staple fiber, a moquette was produced in the same manner as in Example 1, and the gloss and texture of the moquette were evaluated.

As a result, as shown in Table 1, “glitter”, “
The moquette had good gloss and softness such as ``white blur''.

Comparative Examples 1 to 6 The same method as in Example 1 was carried out except that the cross-sectional shape of the pores of the spinneret was different. Staal fibers with a fiber length of 51 m were produced.

A moquette was prepared and evaluated from this staple fiber in the same manner as in Example 1, but as shown in Table 1,
In either case, only moquettes with problems in gloss and softness were obtained.

(Hereinafter, blank space) [Effects of the Invention] The special cross-section fiber of the present invention has an elliptical fiber cross section with 4 to 6 convex portions on each side of the central axis, and a distance l1 between the vertices of the central convex portions, The distance between the vertices of the most convex part [2 and the long sleeve distance of the oval that is the central axis. l! By limiting 3 to within a predetermined range, the moquette obtained from the fiber, for example, has virtually no ``glitter'' or ``white blur'' and has a gentle, deep, and excellent quality. glossiness,
and a soft and smooth texture. It has remarkable effects, such as giving it a nice appearance.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing an example of the cross section of the fiber of the present invention 1, each (a) in Figs. FIG. 4 is a diagram showing a cross section of a fiber obtained using the spinneret of A), and FIG. 4 is a diagram showing a cross section of a conventional fiber used for comparison.

Claims (2)

[Claims] (1) An elliptical fiber whose fiber cross section has one central axis and four to six protrusions on each side of the central axis, and the distance between the vertices of the opposing protrusions is substantially It has a shape that is longest at the center and becomes shorter toward both ends of the central axis, with the distance between the vertices of the central convex portion being l_1, the distance between the vertices of the endmost convex portion of the central axis being l_2, and the central axis. When the major axis distance of the ellipse is l_3, l_1, l_2 and l_
3 is l_1:l_2:l_3=1:0.5~1.0:1.5
A special cross-sectional fiber characterized by satisfying ~4.0. (2) The special cross-section fiber according to claim (1), wherein the special cross-section fiber is a fiber for moquette and high pile.