JPS61160410A - Modified cross section yarn - Google Patents

Abstract

PURPOSE:Modified cross-section yarn having a specific cross-sectional shape, providing woven and knitted goods having elegant luster, favorable crispy feeling and dry feeling when it is woven or knitted. CONSTITUTION:Modified cross section yarn having a cross-sectional shape in which the protruded parts 2 are extended from one connecting part 1 to at least three directions, the angles between the two neighboring protruded parts are <=80 deg.-<=180 deg., the connecting parts between the connecting part 1 and the protruded parts 2 are constricted, and the width of the constricted parts is 0.4-0.95 the width of the protruded parts 2, wherein the constricted parts 3 are in striped channels in the fiber direction.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to thermoplastic fibers with irregular cross-sections, and more particularly to novel irregular cross-section fibers that give woven and knitted fabrics an elegant luster and a desirable squeaky and dry feel.

[Prior art]

Various attempts have been made to give synthetic fiber woven and knitted fabrics the same luster, squeaky feel, and dry feel as silk woven fabrics. A typical example of this is to make the cross-sectional shape of the fiber anomalous, and making the cross-sectional shape multi-lobal with protrusions in three or more places is effective in imparting silky luster, so it is often put into practical use. has been done. As a result, the luster of the woven or knitted material approached the soft luster of silk, and the metallic luster of the original cross-sectional fibers was improved to some extent. However, conventional fibers with a multi-lobal cross-section tend to have a filling state in which the protrusions and recesses of adjacent fibers interlock and restrain each other's displacement, which causes fibers to be displaced in yarns or woven or knitted fabrics. However, the 1a#ii product has the disadvantage that it lacks opacity, repellency, and bulge.

In addition, fibers made of polymers containing specific additives are treated with alkali to produce fibers with a multi-lobal cross-sectional shape that do not have a slimy feel and give a silky, silky, dry feel. The fibers with fine four-convex lines formed on their surfaces were disclosed in Japanese Patent Application Laid-Open No. 54-120728.
It is known that microscopic streaks can be created on the surface by alkali treatment of fibers made of polymers blended with easily soluble polymers or fibers made of fibers with easily soluble polymers arranged on the surface of the fibers. A fiber in which wedge-shaped grooves are formed is known from Japanese Patent Laid-Open No. 58-98423. These fibers eliminate some of the metallic luster and give a fairly dry touch, but
Due to the streak-like or wedge-like irregularities existing on the surface, adjacent fibers tend to be in a packed state in which they are constrained by each other, which adversely affects the opacity and texture of the woven or knitted material.

In addition, in order to prevent the yarns from converging due to the filling state of the fibers that come into contact with each other instantaneously, and thereby to obtain a feeling of opacity, resilience, and bulge in the woven or knitted material, the cross section was cut out on the outer periphery. JP-A-56-144237 proposes a fiber having a C-shaped or V-shaped cross section with such a constriction.

Such fibers have less yarn bunching υ,
Qin has an excellent effect in giving an opaque, dry, and puffy feeling similar to that of silk fibers, but the degree of opening on the concave side of the C-shaped or V-shaped cross-section is in the direction of the fiber axis within the fabric structure. There was a drawback in that the overlap of the fibers, which varied greatly, caused instability on the surface of the fabric, which significantly degraded the quality of the fabric.

[Purpose of the invention]

The present invention has been developed to improve the drawbacks of conventional synthetic fibers as described above, and it exhibits a mild luster similar to that of silk fibers and is excellent in opacity, as well as having a dry, squeaky, and puffy feel. 2. An object of the present invention is to provide a synthetic fiber with an irregular cross section, which can be used in the production of woven or knitted fabrics, and which has an appearance and feel extremely similar to silk in terms of repulsion and other properties.

[Structure of the invention]

The present invention is a thermoplastic synthetic fiber, and has a cross-sectional shape in which protrusions extend in at least three directions from one connecting part, and the angle between adjacent protrusions is 80° or more and 180° or less, and , the connecting part between the connecting part and the protruding part has a constricted shape and the width is 0.4 to 0.95 times the width of the protruding part, and the connecting part between the adjacent protruding parts and the connecting part and the protruding part The above-mentioned object has been achieved by the structure of the irregular cross-section fiber, which is characterized in that the fiber surface has streak-like grooves in the axial direction due to the constriction of the portion.

The resin of the present invention is not particularly limited as long as it is a thermoplastic synthetic fiber, such as polyamide, polyacrylonitrile, polyester, etc., but in order to obtain the same texture as the intended silk fiber, , polyester fibers with excellent physical properties are preferred, and porous polyester fibers are even more preferred.

It is preferable that the porous polyester fiber has at least long fine pores opened in the direction parallel to the fiber axis on the surface and distributed in a striped manner. It is preferable that the ratio of width/width of the largest part is 5 or more. In addition, even if the length of the opening in the axial direction is 5 μ or more, if the ratio of length/width of the maximum part is less than 5, the ratio of the opening to the fiber surface ( This is not preferable since the fibers tend to fibrillate during use in woven or knitted fabrics.It is preferable that the number of openings distributed in stripes be 2/μ or more in the circumferential direction of the fiber surface.

The above preferable conditions make the dry feeling provided by the fiber of the present invention even more excellent.

A preferred porous polyester fiber is, for example, a blended polymer prepared by adding and blending an organic sulfonic acid metal salt represented by the following general formula (n) to a polyester composition mainly consisting of repeating units represented by the following general formula CI). It is obtained by stretching the polyester fiber and treating the obtained polyester fiber with an aqueous alkali solution to dissolve and remove at least a part of the organic sulfonic acid metal salt.

+0C-Q-000(CH2)nOchi...
・・・・・・・・・[,I) (However, n indicates an integer from 2 to 6.) R8O,M ・・・・・・・・・・・・・・・
(11) (However, R represents an alkyl group having 3 to 30 carbon atoms, or an aryl group or alkylaryl group having 7 to 40 carbon atoms, and M represents an alkali metal or an alkaline earth metal.

) The fiber of the present invention has a cross-section of the above-described fiber having a multi-lobal shape or a cross-sectional shape in which multi-lobals are connected as illustrated in FIGS. 1 to 4. The trilobal shape shown in FIGS. 1 and 2 or the modified trilobal shape shown by the solid line in FIG. 4 is significantly different from the trilobal shape of the conventional irregular cross-section fiber shown in FIG.
A constriction 3 is provided at the connecting portion between the connecting portion 1 and the protruding portion 2, and the width of the connecting portion, that is, the minimum width t2 is 0.4 t with respect to the width t of the protruding portion, <t2≦0.95 t. It is limited in scope. The cross-sectional shape in Figure 3 is the first
The trilobals in the figure are connected with one protrusion 2 in common, and the cross-sectional shapes shown by solid lines and dotted lines in FIG. The figure shows a shape in which the trilobals in the figure are connected. The cross-sectional shape of the fiber of the present invention is not limited to the examples shown in FIGS. 1 to 4, and may be a tetralobal shape in which four protrusions 2 extend from a connecting portion 1, or a shape in which a trilobal or a tetralobal is connected to the tetralobal shape. . In the cross-sectional shape of the fiber of the present invention described above, it is necessary that the angle θ formed by adjacent protrusions 2 extending from one connecting portion 1 is 80° or more and 180° or less.

The fibers having the cross-sectional shapes shown in FIGS. 1 and 2 are obtained by melt spinning from a spinneret provided with a discharge port as shown in FIGS. 6 and 7, respectively. The cross-sectional shape shown by the solid line in Fig. 4 can be changed by changing the arrangement angle of the discharge port in Fig. 6.
Also, the cross-sectional shape of the dotted line in FIGS. 3 and 4 is the outside of one elongated hole of the discharge port that has the cross-sectional shape shown in FIG. 6 or the solid line in FIG. Needless to say, this can be achieved by using a discharge port with two elongated holes facing each other at the end as well as at the inner end. Furthermore, the same applies to the tetralobal shape.

The 14-shaped cross-sectional fiber of the present invention as described above has three or four protrusions 2 extending from the connecting part 1 such that the angle θ between the adjacent protrusions 2 is 800 or more and 180° or less. Therefore, the width t2 of the connecting portion between the connecting portion 1 and the protruding portion 2 is the width t of the protruding portion 20.
Since the constriction is 0.4 to 0.95 times 1, the angle θ formed by adjacent protrusions 2 tends to change in the fiber axis direction, so that when a woven or knitted fabric is composed, the fibers in contact with l1II This prevents a filling state in which they restrict each other,
The shear movement between the fibers is facilitated, and the woven or knitted fabric exhibits silk-like luster and opacity, as well as bulges and excellent repellency, giving it a pleasant squeaky and dry feel. play. Width t2 of the connecting part between the connecting part 1 and the protruding part 2
If it is narrower than 0.4 t, this part becomes weak and the protrusion 2 falls down, causing irritation to the woven or knitted fabric, and the fibers tend to become fluffy.

On the other hand, when t2 becomes thicker than 0.95t, the angle θ formed by adjacent protrusions 2 becomes difficult to change in the fiber axis direction, and the fiber remains the same as the conventional multilobal cross-section fiber. Furthermore, if the angle θ between adjacent protrusions 2 is narrower than 80', the adjacent protrusions 2 tend to stick together uniformly in the fiber axis direction, which tends to cause irritation in the woven or knitted fabric. On the other hand, if θ is larger than 180°, the angle θ will not be used to prevent the fibers from filling up, and the supplementary angle θ is likely to be smaller than 80°.

Regarding the cross-sectional shape of the fiber of the present invention, it is not necessary that the lengths of the protrusions 2 are the same, but in order to prevent irritation in the woven or knitted fabric, it is preferable that the lengths are the same, and that θ is also the same. It is preferable to make the shape as symmetrical as possible. The reason for having such a symmetrical shape is that when one protrusion 2 is tilted due to a constriction, θ on both sides changes at the same rate of change so that one becomes narrower and the other becomes wider. The rate of change in θ in the fiber axis direction is uniformly large, and the change in θ is uniformly distributed on the woven or knitted fabric, which prevents irritation and gives the woven or knitted fabric silk-like properties. This makes it easier to obtain the effect of the present invention which provides the following.

The fibers of the present invention give silk-like luster, texture, squeaky feel, etc. to woven or knitted fabrics due to the above-mentioned cross-sectional shape. The striped distribution of finely formed openings gives the gloss a milder opaque feel, making the bulge and repulsion of the woven and knitted material, as well as its squeaky and dry feel, even more similar to that of silk. , which also improves drapability.

(Example〕 Hereinafter, the present invention will be explained by examples.

Polyethylene terephthalate having an intrinsic viscosity of 0.64 and containing 6 wt % of a mixture of alkyl sulfonic acids having 8 to 20 carbon atoms and an average carbon number of 14 as an addition column was prepared by a conventional method using various spinnerets with 24 holes. The fibers were melt-spun and wound at a speed of 1200 m7 minutes. The obtained undrawn yarn was drawn 1 times according to a conventional method, and then stretched to 1000 m.
The yarn was wound at a speed of 7 minutes to obtain drawn yarns having cross-sectional shapes shown in FIGS. 1 to 3 and 5, respectively. obtained 5
0de/24fils polyester drawn filament is used for warp and weft, warp density 43 lines/cm, weft density 4
A plain weave with a density of 0/cm is woven, and the resulting gray fabric is woven using the conventional method L.
After 1 scouring and presetting, alkali treatment was performed for 30 minutes using a hot alkaline solution of 35 r/l NaOH, and then dyed and final set was performed.

The properties of the drawn filaments and fabrics obtained above are summarized in Table 1.

In Table 1, tl is the maximum thickness width of the protrusion 2, t2 is the minimum width of the connecting part between the connecting part 1 and the protrusion 2, θmax is the maximum value of the angle θ formed by the adjacent protrusions 2, and θmin is the maximum thickness width of the protrusion 2. The minimum value, ◎ indicates very good, O indicates good, △ indicates poor quality, and × indicates poor quality.

As shown in Table 1, ff14 that satisfies the conditions of the present invention
, 6, 7, and 9. The fabrics obtained from the irregular cross-section fibers of 11 have good opacity, gloss, dry feel, and fullness.

Flexibility 1 shows good performance in all grades, but in contrast, llI & 11 to 3, where θ does not satisfy the conditions, have inferior fabric bulge, and have a conventional trilobal shape, Arashi 5 or -10, which are close to it, or similar. In Arashi 12, where t2/l is close to 1 and there is almost no constriction, the fabric has a dry feel and is inferior in flexibility, and the constriction is too constricted -8
The quality of the fabric is inferior.

〔Effect of the invention〕

As is clear from Table 1, the irregular cross-section fibers that satisfy the conditions of the present invention provide woven and knitted fabrics with good opacity and gloss.

Provides excellent silk-like properties in all aspects: dry feel, fullness, and softness.

[Brief explanation of the drawing]

1 to 4 are fiber cross-sectional views showing examples of cross-sectional shapes of the fibers of the present invention, and FIG. 5 is a cross-sectional view of conventional trilobal fibers.
6 and 7 are partial plan views of a spinneret showing the shape of the discharge port for spinning fibers having the cross-sectional shapes of FIGS. 1 and 2. FIG. 1... Connecting part, 2... Protruding part, 3...
Neck.

Claims (1)

[Claims] Thermoplastic synthetic fibers with a cross-sectional shape in which protruding parts extend in at least three directions from one connecting part, and the angle between adjacent protruding parts is 80° or more and 180° or less, and the connecting part and The connecting part of the protruding part has a shape that is constricted and the width is 0.4 to 0.95 times the width of the protruding part, and the constriction of the connecting part of adjacent protruding parts and the connecting part and the protruding part An irregular cross-section fiber characterized by a fiber surface having striated grooves in the axial direction.