JPH0361793B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to warps and/or
The weft is composed of flat cross-section fibers, and in particular, the major axis of the fibers is
The present invention is aimed at fabrics in which 50% or more of the fibers used in the fabric stand with a slope of 30° or more. It is characterized in that it is derived from multilayer flat cross-section fibers contained in the spun and drawn fibers of the book.

Generally, when a flat cross-section fiber having a major axis and a minor axis is used in a textile, the flat plane (long diameter side) of the fiber may exist parallel to the textile surface or at an angle. In response to light, the former type of fabric reflects light strongly, making it difficult to obtain a high-quality luster, while the latter type of fabric absorbs light inside the fabric, resulting in a deep, high-quality finish. It is possible to obtain a fabric with a gloss of . The present inventors have aimed at the latter type of fabric, and their particular aim is that 50% or more of the flat fibers present have a long axis with an angle of 30° or more with respect to the fabric surface. It is aimed at fabrics that have stood the test of time, and is characterized by the method of obtaining such fabrics. In other words, in order to make more than half of the flat fibers present in the fabric stand at an angle of 30 degrees or more,
As the starting yarn that gives the flat fibers that exist there,
A multi-layer laminated flat composite fiber having a cross section of 7 or more layers, each layer being laminated at an angle to the major axis of the cross section of the flat composite fiber, and each layer having a lamination surface. Using multilayer laminated flat conjugate fibers that are flat in the direction, the fibers are woven so that the major axis thereof is substantially parallel to the fabric surface, and then the layers of the conjugate fibers are peeled or one component is removed. It has been found that more than half of the flat fibers present in the fabric can be erected at an angle of 30° or more. The flatness (longest axis/longest shortest axis) of the flat cross-section multilayer composite fiber, which is the starting yarn of the present invention, is 2 or more, preferably 3 or more, so that the fiber can be woven as parallel to the fabric surface as possible. Preferably. In addition, the layers divided in the minor axis direction of the starting yarn should be divided almost parallel to the minor axis to prevent remaining flat fibers from delamination or removal of one component later. It is preferable because it is easy to stand up.
Further, the number of layers in the flat cross-section multilayer composite fiber, which is the starting yarn of the present invention, must be 7 or more, that is, 3 or more layers of component A and 4 or more layers of component B of the composite components. The reason for this is that even in flat multilayer composite fibers, if the number of layers is less than 7, the degree of flatness of the flat fibers remaining after delamination or removal of one component is small, and even if they are left standing, they will not emit light. This is because the absorption effect is small. The number of layers is preferably 9 or more, more preferably 11 or more, and the starting yarn is a multilayer composite fiber. Furthermore, after peeling or removing one component, each fiber stands flat and almost vertically, but in order to do so,
As shown in the attached Figure 1, each layer constituting the composite fiber must be flat in the laminated plane direction before peeling or one component removal. The gaps between the flat cross-section fibers formed by component removal become deeper, allowing deep and vivid dyeing.

In the present invention, if more than half of the flat fibers present in the fabric stand with an inclination of 30° or more with respect to the fabric surface, the starting yarn should have a major axis approximately equal to the fabric surface as described above. It has been found that by weaving in parallel, the remaining flat fibers after delamination or removal of one component can be maintained at the desired level. In particular, in the case of delamination, adjacent flat fibers stand almost vertically after delamination, but on the other hand, when a component is extracted and removed, the remaining flat fibers tend to fall down, so the layer on the side of the component to be extracted is Forming a thin layer (i.e., reducing the composite ratio,
20% by weight or less) is desirable. For example, according to the former method, that is, the delamination method, 80% or more of the remaining flat fibers may exist at an angle of 45° or more, and 70% or more may exist at an angle of 60° or more.

In the present invention, it has been found that by erecting half or more of the remaining flat fibers at an angle of 30 degrees or more, the dyed product can be dyed in deep and vivid colors, as shown in the examples below.

To explain the present invention with reference to drawings, Fig. 1 is an enlarged schematic cross-sectional view of an example of a starting yarn used in the present invention, that is, a flat cross-section multilayer composite fiber, and is composed of A polymer and B polymer, and the number of layers is 6 A layers. , B layer 7 makes a total of 11 layers, and the flatness (longest axis / longest shortest axis) is about 2.7
This is an example. FIG. 2 is a schematic partial cross-sectional view of a fabric using the starting yarn of FIG. 1, and 1 is the yarn shown in FIG. 1. FIG. 3 is a schematic partial cross-sectional view of the fabric of the present invention obtained after the fabric shown in FIG. 2 is treated with an alkaline aqueous solution to remove the B layer.

Hereinafter, the present invention will be specifically explained using Examples and Comparative Examples.

Example 1 and Comparative Example 1 The starting yarn of Example 1 was made of 80% by weight of polyethylene terephthalate (Polymer A) and 20% by weight of polyethylene terephthalate (Polymer B), which was a mixture of 15% by weight of polyethylene glycol. 6 layers of A polymer, 7 layers of B polymer as shown
A plain woven fabric was woven using 75d/5f yarns of flat multilayer composite fibers consisting of layers with an oblateness of about 2.7 at a diameter yarn density of 126 yarns/inch and a weft yarn density of 110 yarns/inch. This fabric was then treated with a dilute aqueous solution of NaOH to remove the B polymer portion, yielding a fabric according to the invention as shown in FIG. In this woven fabric, approximately 80% of the flat fibers made of polymer A were erected at an angle of 35° to 45° with respect to the woven fabric surface.

On the other hand, a plain woven fabric similar to the above was woven using circular cross-section fibers 63d/30f made of the above-mentioned polymer A alone (Comparative Example 1).

Next, the plain fabrics of Example 1 and Comparative Example 1 were dyed with Eastman Polyester Blue under the same dyeing conditions.
When dyed with BLF (disperse dye), the former K/
The S value was about 1.4 to 1.5 times that of the latter, and the former appeared darker and more vivid than the latter.

Example 2 Among the A and B polymers of the starting yarn used in Example 1, B polymer was changed to polyamide, and the composite ratio of A and B was changed to 50:50 to produce a flat multilayer composite fiber with an oblateness of 3.2. Obtained. After weaving a plain woven fabric having the same texture as in Example 1 from this yarn, layers A and B were separated using a dilute solution of benzyl alcohol. The fabric thus obtained is composed of polyester and nylon flat fibers in which 45% of the total fibers are 30° to 35°, 25% are approximately 45°, and 10% are 60°.
It was standing at ~70°.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view of an example of a flat cross-section multilayer composite fiber used as a starting yarn for the fabric of the present invention, FIG. 2 is a schematic partial cross-sectional view of an example of a fabric using the same, and FIG. 1 is a schematic partial cross-sectional view of the fabric of the present invention after one component has been removed from the fabric of the figure; FIG.

Claims (1)

[Claims] 1 The warp and/or weft are multilayer laminated type flat conjugate fibers with a cross section of 7 or more layers and a flatness degree (longer axis/breadth axis) of 2 or more, and each layer is made of the flat conjugate fiber. Using multi-layer laminated flat composite fibers, which are laminated at an angle to the major axis of the cross section, and each layer is flat in the direction of the laminated plane, the major axis of the composite fibers is substantially parallel to the fabric surface. 1. A method for producing a woven fabric with excellent light absorption, which comprises weaving the conjugate fibers so that the conjugate fibers have the same properties as the conjugate fibers, then peeling off the interlayers of the conjugate fibers or removing one component and dyeing the conjugate fibers.