JPS6246658B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to a polyester napkin. (Prior Art) Generally, a raised fabric is obtained by raising and cutting the fibers on the surface of the fabric using a cloth or the like. Conventionally, as a raised fabric, a raised fabric made of natural fibers such as wool has been known, and among chemical fibers, rayon and acetate fibers are often used for raised fabrics. However, raised fabrics using these natural fibers or chemical fibers have the drawbacks of low wrinkle resistance and wash and wear properties.In order to improve these drawbacks, synthetic fibers, especially polyester fibers, have been used. The development of raised fabrics is strongly desired. However, polyester fibers have very poor napping properties, so it is necessary to repeat the napping process many times, resulting in poor work efficiency and the resulting fabrics only have a small napping angle. . In addition, with polyester fibers, the snapback phenomenon occurs, which is a phenomenon in which the cut ends that are stretched during raising tend to elastically return to their original shape, which causes the raised fibers to bend irregularly (i.e., have low straightness), resulting in raised fibers. There were problems such as spoiling the appearance of the surface, and it was extremely difficult to obtain a raised fabric of satisfactory quality. (Objective of the Invention) The object of the present invention is to improve the drawbacks of such a raised fabric using polyester fibers, and to provide a raised fabric with excellent straightness and a large nap angle of the raised fibers. (Structure of the Invention) That is, the present invention provides a raised fabric obtained by a raising process, in which at least the raised fibers have a single fiber denier of 2.5 or more, and the bending hardness of the single fibers is 2.0 times or more of a reference value. It is made of modified polyester fibers having an irregular cross-sectional shape and copolymerized with sodium sulfoisophthalic acid, the napped fibers have a napped angle of 50° or more, and the napped fibers have a density of at least 7 x 10 ⁴ fibers/in. ^2.The polyester fabric is characterized by: The raised fabric of the present invention is a raised fabric obtained by a raising process, and has a pile structure etc.
This does not mean a so-called cut pile raised fabric obtained by cutting pile.
That is, in the present invention, a raised fabric with a large raised angle is obtained using a conventional raising method. In the raised fabric of the present invention, at least the raised fibers are made of modified polyester. The modified polyester here means a polyester copolymer containing 10 mol% or less of another dicarboxylic acid or glycol, and the most preferred polyester is polyethylene terephthalate, but it also includes other polyesters with spinnability. It is something that As the copolymerization component, polyethylene terephthalate copolymerized with sodium sulfoisophthalate is most suitable. A matting agent, stabilizer, heat resistant agent, coloring agent, etc. may be added to this modified polyester. Although the intrinsic viscosity of the modified polyester is not particularly limited, it is desirable that it is low, and 0.3 to 0.65 is effectively used, and the strength is preferably 1.0 to 4.0 g/de. Furthermore, in the present invention, it is necessary that the single fiber denier of the modified polyester fiber is 2.5 denier or more, and the bending hardness of the fiber is 2.0 times or more the standard value. If the single fiber denier is less than 2.5 denier, it becomes difficult to obtain a nap with a large nap angle, which is the object of the present invention. Further, the bending hardness of the fiber as used in the present invention is calculated by the following formula. B=E・I However, E: Young's modulus I: Moment of inertia of area In addition, the standard value is the second moment of inertia of a fiber with a solid circular cross section and a single fiber denier of 2 deniers. Assuming I ₀ , it is obtained by B ₀ =E・I ₀ . In the raised fabric of the present invention, it is necessary that the bending hardness of the raised fibers is at least 2.0 times the standard value, and if the bending hardness is less than 2.0 times, it is difficult to obtain a raised fabric with a large nap angle. Become. Fibers having such bending hardness can be obtained by increasing the single fiber denier, but increasing the single fiber denier unnecessarily makes the surface touch of the raised fabric rough and hard. It is preferable to increase the bending hardness by making the cross section irregular; for example, one having a triangular outer circumferential cross-sectional shape and a hollow portion is preferably used. In the present invention, part or all of the surface of the fabric is made of such modified polyester fibers, and it is necessary that at least the raised fibers are made of the modified polyester fibers, but the type of fabric is particularly Not limited to,
It may be in any form such as woven fabric or knitted fabric. Of course, the modified polyester fibers or other fibers may be used for parts other than the front surface of the fabric, such as the middle layer and the back surface. The fabric used in the present invention may be a woven or knitted fabric in which spun yarn, filament yarn, filament processed yarn, or a combination of these yarns made of modified polyester fibers are woven and knitted so as to be located on the surface of the fabric. There are no particular limitations on the texture of woven or knitted fabrics, and textiles may include single weave structures such as plain weave, twill weave, satin weave, or variations thereof, warp or weft double weave, warp and warp double weave, and coal texture. For knitted fabrics, weft knit structures such as Tenkasa, Smooth, Ponchima, Motsukuro Dei, etc., and warp knit structures with many weft jumps such as Half and Satin are used. The raised fabric of the present invention can be obtained by subjecting the fabric thus configured to a wet heat treatment and then raising the fabric, or by treating and heating the fabric with an acidic solution containing an aromatic carboxylic acid compound and then raising the surface of the fabric, or , after treatment and heating with an alkaline solution containing amine compounds,
It is obtained by raising the surface of the fabric. In the thus obtained raised fabric, the raised fibers have a raised angle of 50° or more, and the raised angle is as large as that obtained by cutting pile. The napped angle here means the angle between the napped fibers that form the napped fibers and the base fabric, and in the case of a napped angle of 90°, the napped fibers are napped perpendicular to the fabric. It means there is. 1st
Figure A is a diagram showing a microscopic photograph of a cross section of the raised fabric of the present invention, and Figure 1B is a diagram showing a microscopic photograph of a cross section of a conventional polyester raised fabric. As is clear from FIG. 1A, the nap angle of the raised fabric of the present invention is different from that of the conventional fabric and is close to that of a cut pile fabric. Furthermore, it is desirable that the density of the raised fibers having a large napped angle as described above be 7×10 ⁴ fibers/in ² or more. That is, when the napping density is 7 x 10 ⁴ fibers/in ² or more, the napping fibers, in combination with the physical properties of the modified polyester fibers mentioned above, will bend and sag under repeated external forces. It is thought that this is to resist. Incidentally, the nap density is calculated according to the following calculation formula. Raised density (strands/in) = Vertical density (strands/in) × Horizontal density (strands/in) × 2 × number of filaments In addition, fabrics with such a large nap density have a soft, dense nap surface, and a smooth surface. This fabric is as excellent as a cut pile raised fabric, and in order to obtain raised fibers with a large raised angle, an effect that cannot be obtained simply by increasing the single fiber denier can be obtained by limiting the raised density. It is. (Effects of the Invention) As described above, the raised fabric of the present invention has improved napping properties and can obtain uniform napping without impairing the wrinkle resistance and wash-and-wear properties characteristic of polyester fibers. Also, because the napped angle is large and the density of the napped fibers is high,
Even though the fabric is produced using a conventional napping process, it is possible to obtain an appearance similar to the napping that is found in cut pile fabrics. Furthermore, since the raised fabric of the present invention forms raised fibers from modified polyester fibers, it forms a raised surface with excellent straightness and no snapback phenomenon. Examples will be explained below. Example 1 Modified polyester filament yarns (i.e., polyethylene terephthalate copolymerized with 2.5 mol% sodium sulfoisophthalate) as shown in A to C in Table 1 were attached to the front reed. 50de/24fils) was used for the middle reed and back reed, and a tricot was organized as shown in Table 2. This tricot knitted fabric is relaxed at 100℃,
After presetting at 170°C, the surface of the modified polyester fiber was then raised using a needle raising machine. When raising the cloth, a sufficient raising effect was obtained by passing it through the raising machine four times. The thus obtained raised fabric had a uniform appearance in which the raised fibers were straight, not bent, and stood upright at an angle of 50 to 75° with respect to the cloth surface. For comparison, those shown in D and E in Table 1 are A
Using the same modified polyester filament yarn as in ~C, a tricot was knitted with the structure shown in Table 2, and raised in the same manner. When raising the hair, a sufficient raising effect can be obtained just by passing it through the hair raising machine four times. However, the raised fabric made of fiber D obtained in this way has a large nap angle and stands upright, but the nap density is low;
In addition, the raised part was rough and hard, making it impossible to obtain a good appearance and texture. In addition, the raised fabric made of Fiber E has a high nap density and can provide a supple drape texture, but the nap angle is small at an angle of 35 to 40 degrees with respect to the fabric surface, and the straightness is poor. It was hot.

【table】

【table】 [Brief explanation of the drawing]

FIG. 1A is a diagram showing an example of a microscopic photograph of a cross section of a raised fabric of the present invention, and FIG. 1B is a diagram showing an example of a microscopic photograph of a cross section of a conventional polyester raised fabric.

Claims (1)

[Scope of Claims] 1. In a raised fabric obtained by raising processing, at least the raised fibers have a single fiber denier of 2.5 or more, and the bending hardness of the single fibers expressed by the following formula (1) is 2.0, which is the standard value. It is made of modified polyester fibers copolymerized with sodium sulfoisophthalic acid and has an atypical cross-sectional shape that is at least twice as large as the fibers, the nap angle of the raised fibers is 50° or more, and the density is at least 7 x 10 ⁴ fibers. / in ² polyester fabric. Bending hardness B=E・I (1) However, E: Young's modulus I: Moment of inertia of area 2 The fabric according to claim 1, wherein the irregular cross-sectional shape is a cross-sectional cross-section having a hollow portion. 3 The intrinsic viscosity of modified polyester fiber is 0.3~
0.65 and a single fiber strength of 1.0 to 4.0 g/de.