JPH034653B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a fiber bundle of irregular cross-section that can impart silk-like luster and a silk or linen-like texture to a fabric.

<Conventional technology> Conventionally, by making the cross-sectional shape of thermoplastic multifilament non-circular, the luster and sliminess peculiar to thermoplastic multifilament were removed, giving the resulting fabric silk-like luster and texture. Various things have been done.

<Problems to be Solved by the Invention> However, conventional yarns with irregular cross-sections having substantially point-symmetrical shapes, such as triangular cross-sections, star-like or leaf-like protrusions, cannot be obtained with conventional thermoplastic filaments having circular cross-sections. These single fibers were put into practical use as a material that imparts gloss and a texture that eliminates sliminess, but the cross section of these single fibers consists of alternating protrusions and depressions of approximately the same shape in the circumferential direction, as shown in Figure 6. Therefore, in a multifilament fiber bundle made of such single fibers, as shown in FIG. 5, the convex portions of other single fibers enter the concave portions of the single fibers, and a so-called filling effect occurs where the single fibers come into close contact with each other. Therefore, when the single fibers in the yarn or fabric are restricted, the movement of the single fibers is restricted, resulting in a lack of fluffiness.

Furthermore, although it is the outer periphery of the filament that is directly touched by hands or skin or exposed to light, the outline of the outer periphery of the filament fiber bundle is smooth as shown by outline B in Figure 5, so it is easy to touch. There is little change in gloss or
For this reason, it has the disadvantages of lacking silk or linen-like silkiness, dry surface touch, and luster.

In the present invention, in order to give a multifilament fiber bundle a silk or linen-like appearance and texture, it is extremely important not only the cross-sectional shape of the single fibers but also the shape of the outer periphery of the fiber bundle, which comes into direct contact with hands and skin and is exposed to light. This is what we arrived at as a result of various studies focusing on the following.
The aim is to create fiber bundles with irregular cross-sections that have a silk-like luster and can give the fabric a fluffy, silky feel, as well as a silk- or linen-like feel with a dry surface touch. Our goal is to provide the following.

<Means for Solving the Problems> In other words, the present invention provides a thermoplastic multifilament fiber composed of a single fiber with an asymmetrical cross-section having a bulge portion having an acute-angled convex portion and a base portion. A bundle, which has interfilament entanglement in the longitudinal direction without forming loops, and in which 50% or more of the number of fiber bundles forming the outer periphery of the fiber bundle have the bulging part and the side surface of the base as the outermost layer. This is a fiber bundle with an irregular cross section, which is characterized in that it is arranged in such a way that it is positioned in the same position.

Hereinafter, the present invention will be explained in further detail.

First, the irregular cross-section fiber bundle of the present invention is a thermoplastic multifilament fiber bundle composed of single fibers of irregular cross-section having an asymmetrical shape and consisting of a bulge portion having an acute-angled convex portion and a base portion. That is, the irregular cross-section fiber bundle of the present invention is a thermoplastic multifilament fiber bundle in which a plurality of asymmetrical single fibers each having a cross-sectional shape consisting of a bulge portion having an acute-angled convex portion and a base portion are assembled by intertwining. be. Here, to explain the cross-sectional shape of a single fiber, the cross-sectional shape of a single fiber consists of a bulge having an acute-angled convex portion and a base. In this case, the bulge has an apex angle of α
is required to be an acute angle, and a convex portion where the apex angle α is a right angle or an obtuse angle is not suitable because the unevenness between the bulge and the base becomes gentle and the effect described below cannot be obtained. However, if the apex angle of the convex part is too small, the rigidity will decrease and the convex part will be easily bent, so it is preferable that the apex angle of the convex part is 20° to 80°. In the present invention, the apex angle of the convex portion refers to the angle defined by the protruding bases on both sides of the convex portion and the tip of the convex portion. The cross-sectional shape of the single fiber is determined by the length of the base and the bulge in the protruding direction, since the bulging part and the side surface of the base of the single fiber forming the outer periphery of the single fiber bundle are likely to be arranged in the basal outer layer, as described later. It is preferable that the length L is larger than the maximum width W of the bulge in the direction orthogonal to the protrusion direction.

In this way, the bulges of the single fibers have acute-angled protrusions, so the fiber bundles that are constructed have a dry surface touch and a natural texture due to the unevenness between the protrusions protruding from the outer periphery and the base. It can give a refreshing feeling. In addition to the above-mentioned shape, the cross-sectional shape of the single fiber exhibits an asymmetric shape. here,
A non-point symmetric shape is a shape that is not point symmetric,
A point-symmetrical shape does not require exactness in terms of geometry, and as shown in Figure 6, a shape that is slightly deformed and has alternating convex portions and concave portions of substantially the same shape is also symmetrical. Include in shape. If the cross-sectional shape of the single fibers is point symmetrical, even if the cross-sectional shape has an acute angle convex portion, it is not suitable because the filling action between the single fibers tends to occur.

In the irregular cross-section fiber bundle of the present invention, the cross-sectional shape of the constituent single fibers exhibits an asymmetrical shape consisting of a bulge having an acute-angled convex portion and a base. The convex portions of the single fibers enter into the fabric, making it difficult for the so-called filling effect in which the single fibers adhere to each other to occur, giving the resulting fabric a fluffy feel and a texture similar to silk or linen.

FIGS. 2 and 3 show examples of the cross-sectional shapes of the single fibers of the present invention. In FIG. 2, a triangular bulge 1 having two acute-angled protrusions 3 has a mushroom-shaped cross-section protruding from one end of a rod-shaped base 2, and two peaks on both sides of the bulge 1 Each corner is an acute-angled convex portion 3. Also, the third
In the figure, a hexagonal bulge 1 with concave sides protrudes from one end of a curved base 2, and has four acute-angled protrusions 3. Although not shown in the drawings, a shape in which a rod-shaped base and a bulge having acute-angled convex portions are formed at both ends is also an embodiment of the cross-sectional shape of the single fiber of the present invention.

The irregular cross-section fiber bundle of the present invention is a collection of single fibers having the above-mentioned cross-sectional shapes, so it does not have the filling effect seen in conventional fiber bundles made of single fibers with point-symmetrical triangular cross-sections or multilobal cross-sectional shapes. Therefore, voids are likely to be formed between the single fibers in the yarn or fabric, and the fabric can be made to have a rich feeling of fullness and a texture similar to silk or linen.

In addition to the above-mentioned conditions, the irregular cross-section fiber bundle of the present invention is such that 50% or more of the number of single fibers forming the outer periphery thereof are arranged such that the side surfaces of the bulge and the base are located in the outermost layer. That is, as shown in FIG. 1, the fiber bundle of the present invention has a structure in which 50% or more of the single fibers forming the outer periphery of the fiber bundle are arranged such that the side surfaces of the bulge and the base are located in the outermost layer. The outermost layer of the fiber bundle is uneven as shown by outline A due to the protrusion of the acute-angled convex portion of the bulge. The single fibers arranged so that the sides of the bulge and the base are located in the outermost layer account for 50% or more, preferably 60% or more of the number of single fibers forming the outer periphery of the fiber bundle. If the number is less than 50%, the protrusion due to the acute-angled convex portion of the bulge portion will be small and the dry surface touch will be deteriorated, which is not preferable.

In the fiber bundle of the present invention, since the constituting single fibers are arranged in this manner, a large number of acute-angled convex portions protrude from the outer periphery of the fiber bundle, and the protrusion of these convex portions causes the outer layer of the fiber bundle to become uneven. When you touch the resulting fabric, your fingertips will be pleasantly stimulated by the protruding protrusions, and the contact area transmitted to your fingertips will also be reduced.
The texture is smooth and dry, like silk or linen, and has a natural smooth feel. Furthermore, as mentioned above, the fiber bundle of the present invention has acute-angled convex portions protruding from the outer layer of the fiber bundle, so that the light rays reflected by the convex portions and the concave portions (base) partially cancel each other out, giving it a silk-like soft luster. exhibits.

The irregular cross-section fiber bundle of the present invention, for example, a fiber bundle consisting of single fibers having the cross-sectional shape shown in FIG. Obtained by performing an interlacing process. In other words, if less than 50% of the number of single fibers forming the outer periphery of the yarn have the bulging part and the side surface of the base located in the outermost layer, the yarn after being drawn may not be subjected to the embedding or entangling treatment. Thus, the yarns may be bundled so that the number of single fibers at the outer periphery satisfies the conditions of the present invention. In addition, in performing the entangling process, in order to achieve the effects of the present invention, it is important that loops due to sagging between the filaments are not formed.

The irregular cross-section fiber bundle of the present invention that satisfies the above conditions is:
This may be woven or knitted as it is according to a known method, or may be woven or knitted after being subjected to a false twisting process, both of which can produce the effects of the present invention.

Examples of the thermoplastic multifilament fiber bundle used in the present invention include multifilament fiber bundles obtained from polymers such as polyester and polyamide, and copolymers and blend polymers thereof. Polyester multifilament fiber bundles with excellent physical properties are preferred because they can easily provide similar gloss and texture.

<Examples> Hereinafter, the present invention will be specifically explained using examples.

Example 1 Polyethylene terephthalate was spun using a spinneret having 48 spinning holes as shown in FIG.
A mushroom-shaped polyester multifilament yarn 75d/48f with L/W=1.5, consisting of a bulge and a base with two 68° convex parts, was manufactured and
An interlacing treatment was performed using the interlace nozzle described in Japanese Patent No. 1175 to obtain a fiber bundle of the present invention.

When the cross section of the obtained fiber bundle was photographed with 400 times magnification, 10 (63%) of the 16 single fibers forming the outer periphery of the fiber bundle had the bulge and the side of the base at their maximum. The fiber bundles were arranged in the outer layer, and protrusions protruded randomly from the outer periphery of the fiber bundle. On the other hand, for comparison, a fiber bundle for comparison was produced in the same manner as above except that the cross-sectional shape of the single fibers was changed to the eight-lobed cross-sectional shape as shown in FIG.

These fiber bundles are used for the warp and weft, and the warp density is 88.
The fabric was woven into a 2/2 twill with a thread/2.54 cm and a weft density of 86 threads/2.54 cm, and was subjected to relaxation scouring, presetting, dyeing, and final setting in accordance with conventional methods to obtain a woven fabric. The fabric obtained from the comparison fiber bundle lacks a sense of fullness and has a dry surface feel, whereas the fabric obtained from the fiber bundle of the present invention exhibits a fullness and a soft feel to the touch. It had a smooth, dry surface touch and a natural sheen like silk or linen, and also had a silk-like soft luster.

<Effects of the Invention> As described above, the irregular cross-section fiber bundle of the present invention is made up of aggregation of irregular cross-section single fibers having an asymmetrical shape and consisting of a bulge having an acute-angled convex portion and a base. Like conventional fiber bundles made of single fibers with point-symmetric triangular cross-sections and multi-lobed single fibers, the convex parts of other single fibers enter into the concave parts of single fibers and the single fibers come into close contact with each other, so-called filling. This effect is difficult to occur, and therefore voids are likely to be formed between single fibers in the thread or fabric, resulting in a fabric that is rich in fluffiness and has a feel similar to silk or linen.

In addition, more than 50% of the single fibers forming the outer periphery of the fiber bundle are arranged so that the bulge having an acute angle convex part and the side surface of the base are located in the outermost layer. Many protrusions protrude outward from the bundle, and the outer periphery of the fiber bundle is uneven. When you touch the resulting fabric, your fingertips are pleasantly stimulated by the protruding protrusions, and the contact area transmitted to your fingertips is also reduced. Therefore, it has a smooth, dry surface and a natural smooth feel, similar to silk or linen.
Furthermore, since the outer layer of the fiber bundle has protruding convex portions, the light rays reflected by the convex portions and the concave portions (base portions) partially cancel each other out, resulting in a silk-like soft luster.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an example of the embodiment of the fiber bundle with irregular cross-section of the present invention, FIGS. 2 and 3 are cross-sectional views showing examples of the cross-sectional shape of the single fibers of the fiber bundle of the present invention, and FIG. Figure 2 is a cross-sectional view showing an example of the spinning hole shape of a spinneret for spinning single fibers with the cross-sectional shape shown in Figure 5 is a cross-sectional view of a conventional irregular cross-section fiber bundle, and Figure 6 is a cross-sectional view of a conventional irregular cross-section single fiber bundle. FIG. 2 is a cross-sectional view of fibers. 1...Bulging part, 2...Base, 3...Acute-angled convex part.

Claims (1)

[Claims] 1. A thermoplastic multifilament fiber bundle composed of asymmetrically shaped irregular cross-section single fibers consisting of a bulge having an acute-angled convex portion and a base, in which the fibers extend between the filaments in the longitudinal direction without forming a loop. An irregular cross-section fiber characterized in that it has entanglement and that 50% or more of the single fibers forming the outer periphery of the fiber bundle are arranged such that the side surfaces of the bulge and the base are located in the outermost layer. bundle.