JPH05140860A - Production of fiber-raised web - Google Patents

Abstract

PURPOSE:To facilitate to remove the crimps of raised fibers by a polishing treatment at a low temperature to obtain the subject product having high quality by subjecting polyester fibers used for raised fibers to a specific limited shrinkage thermal treatment before the fibers are crimped. CONSTITUTION:In a fiber-producing process, polyester fibers are subjected to a thermal treatment at 160-230 deg.C under a limited shrinking condition of 1-7% and subsequently crimped. The treated fibers are usually dyed at 90-135 deg.C and then employed as raised fibers to obtain a fiber-raised web. The raised fibers in the web are subjected to a polishing treatment preferably at 120-200 deg.C to obtain the objective product. The thermal treatment under the limited shrinkage condition of 1-7% is preferably performed by feeding the fibers to a rear roller in an amount more excessive 1-7% than their feeding amount to a front roller.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a napped fabric in which crimps applied to polyester fibers used as napped fibers can be easily removed in a post-processing step such as a polisher.

[0002]

2. Description of the Related Art Since polyester fibers have a good heat setting property, by subjecting the fibers to a high heat treatment at the stage of the raw yarn to keep the heat shrinkage rate low, it is possible to prevent deformation even by washing or ironing. Fabric can be obtained,
Further, it is well known that by giving pleats to a fabric at a high temperature, a garment in which the pleats cannot be easily erased can be obtained. It is said that this is due to the high temperature-dependent high crystallinity and high orientation of the polyester fiber. The composition of animal hair such as mink and fox consists of a two-layer structure of upper hair and lower hair, and the upper hair is straight without crimping (although the effect of tapering the tip is also added), When it comes into direct contact with human skin, it has a good texture because it has a good brushing effect on the hair, and it has a crisp glossy appearance instead of a stiff appearance because there is no crimp. There is. On the other hand, the lower hair is originally intended to improve heat retention, and is sufficiently crimped to give a volume feeling.
In recent years, napped products such as velours, moquettes, carpets, boars and high piles have been widely used in various fields due to their luxury and good texture. This napped product is an imitation of the above animal hair as it is, and is usually composed of upper hair and lower hair. However, the crimping of the tip of the upper hair becomes a napped cloth after the polisher process (saw blade shape). The surface of the pile is rubbed with a high-temperature heat roll that has a rubbed surface) to remove it, giving it an animal hair-like appearance and texture. As a material used, acrylic is often used for relatively inexpensive materials such as high pile, and polyester is used for high-quality products such as velour, moquette, and carpet, or for fields requiring physical properties such as heat resistance and light resistance. It is currently used. Polyester fibers are more difficult to remove crimps than acrylics, so they are subjected to crimp removal treatment with a polisher at a temperature close to 200 ° C, but the crimps still cannot be removed sufficiently, and processability and product performance (texture, texture, There is a problem in appearance. This is because, due to the good heat-setting property of the polyester fiber, the crimp is firmly fixed in the raw cotton production step and the subsequent high heat treatment (particularly in the dyeing step).

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for producing a napped fabric using polyester type short fibers which are excellent in the above-mentioned conventional drawbacks and have extremely excellent crimp removing property in a polisher treatment. Is to provide.

[0004]

Means for Solving the Problems As a result of intensive studies for solving the above-mentioned problems, the present inventors have found that a step prior to a crimping step in producing a fiber for forming a nap of a napped fabric. In the case where the fiber is subjected to a specific heat treatment for limited shrinkage, the fiber is subjected to a dyeing treatment in which the fiber is subjected to a high heat history of 130 to 135 ° C. in moist heat, and then a napped fabric is produced using the fiber, The inventors have found that the crimps applied to the fibers can be easily removed by a polisher treatment at a relatively low temperature, and a napped fabric having an excellent texture and appearance can be obtained. That is, in the present invention, the polyester fiber obtained by heat-treating at 160 to 230 ° C under a restricted shrinkage condition of 1 to 7% and then crimping is dyed in the yarn making step, and then the fiber is napped. A method for producing a napped cloth is characterized in that a napped cloth is prepared as a fiber, and the napped cloth is subjected to a polisher treatment. In the method of the present invention, it is necessary to perform a heat treatment for promoting crystallization at a temperature equal to or higher than the highest temperature at which the fiber has a history of being formed before the step of crimping the fiber. .. The heat treatment temperature is 160 ° C. or higher and 230 ° C. or lower, preferably 180 ° C.
It is desirable that the temperature is not less than 0 ° C and not more than 210 ° C. When the temperature is low, the heat treatment temperature is lower than the dyeing temperature performed by wet heat, the crimps applied to the fibers are firmly fixed during dyeing, and it is difficult to remove the crimps by the subsequent polisher treatment. Is not preferable. On the other hand, the heat treatment temperature is 230
Even if the temperature exceeds ℃, there is no great influence on crystallization and orientation, so there is no point in raising the temperature above this, and rather the processability tends to deteriorate, which is not preferable. further,
It is important that the heat treatment of the present invention is carried out under the condition of limited shrinkage for promoting crystallization. The "limited shrinkage" in the present invention means that the heat treatment is not performed in a relaxed state, for example, the feeding state of the fiber bundle (toe) that passes through the process is controlled between the front and rear rollers, and the shrinkage amount caused by the heat treatment is a predetermined value. Is to be limited to. In the present invention, the restricted shrinkage is 1% or more and 7% or less, preferably 2% or more 6
It is desirable that the heat treatment be performed at a rate of not more than%. If it is less than 1%, the crimp removability is insufficient, and if it exceeds 7%, the tow becomes loose and the production processability becomes poor. Specifically, the limiting shrinkage can be 3% by heat-treating the front roller by 3% excess with respect to the rear roller.

The fibers that have been subjected to the heat treatment for limiting shrinkage in this way are then transferred to the crimping step and are
A crimp of about 20 pieces / inch is applied, and if necessary, a drying step and a cutting step are cut into about 30 to 150 mm to obtain raw cotton. Then, the obtained raw cotton is spun yarn according to a conventional method and dyed at 90 to 135 ° C. to obtain a fiber for nap. Next, in the present invention, using the fiber for napped hair, a napped cloth such as high pile, carpet, moquette, velour, etc. is prepared in accordance with a conventional method, and the crimp applied to the napped fiber is removed by a polisher. As described above, the polyester fiber used in the present invention is subjected to a specific limiting shrinkage heat treatment before the crimping step, and the crimps are easily removed. Are very easily removed. 200 ° C
The polisher treatment may be carried out at the above high temperature, but if the polisher treatment is carried out at an excessively high temperature, the fabric becomes coarse and hard, and the fluffiness and gloss are likely to be poor.
It is preferable to polish at about 0 ° C. The type itself of the napped fabric of the present invention is not particularly limited, and a napped fabric,
Either napped knit may be used.

The fibers used in the present invention are not particularly limited as long as they are polyester fibers, and polyethylene terephthalate, polybutylene terephthalate and copolymerized polyesters obtained by modifying them with a third component may be used. Examples of the third component include diphthalic acid components such as isophthalic acid, phthalic acid, naphthalenedicarboxylic acid, metal sulfonate group-containing isophthalic acid, adipic acid, sebacic acid, diethylene glycol, butanediol,
Examples thereof include diol components such as hexanediol, cyclohexanedimethanol, bisphenol, polyethylene glycol and polytetramethylene glycol. Also,
In addition to round cross section, fiber cross section, flat cross section, T type, U type, V
Type, Y type, C type, X type, W type, dog bone type, 3 to 6
The cross section is not limited to a square cross section, a 3 to 14 lobe cross section, a hollow cross section, and may be a multi-component fiber such as a composite fiber. Further, these fibers include a matting agent, a stabilizer, a flame retardant, Various additives such as antibacterial agents may be included.

[0007]

EFFECTS OF THE INVENTION According to the present invention, crimp removal of naps can be carried out at a lower polisher temperature as compared with the conventional method for producing napped fabrics using short polyester fibers, so that excellent texture and appearance can be obtained. It is possible to industrially and easily produce a high-quality napped fabric product exhibiting the above.

[0008]

EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited thereto. Example 1 Polyethylene terephthalate was spun by an ordinary melt spinning method to obtain a tow (750,000 denier, single fiber fineness 6 denier, round cross section). This is subjected to normal stretching and then 200
Heat treatment for 25 seconds while giving 3% of restricted shrinkage between heat rolls at ℃, apply crimp in the usual indentation crimping process, and then perform relaxation heat treatment at 130 ℃ × 15 minutes to dry and crimp the tow. I went. This was cut with an ordinary cutter to obtain polyester short fibers (cut length 51 mm). After the ordinary dyeing of these short fibers at 130 ° C., a card sliver was prepared and a high pile knitted fabric (pile length 18 mm, pile weight 600 g / m ↑ 2) was knitted with a sliver knitting machine. Then, after backing with an acrylic resin, it was passed through a polisher heated to 170 ° C. twice to remove crimps on the napped surface layer portion. As a result of observing the tips of the single fibers of the high pile, crimps were completely removed, and a soft knitted fabric with a good texture and good nap appearance was obtained.

Comparative Example 1 After the same tow as in the example was used for stretching in the same step, a fixed length heat treatment was performed between the heat rolls at 200 ° C. without limiting shrinkage, and the same step as in the example After that, a high pile was knitted. Then, in order to remove the crimp at the tip of the high pile, polisher treatment was performed under the same conditions as in the example. However, the crimp at the tip of the single fiber was not removed, and the hair had a poor dryness and gloss. Therefore, the polisher temperature is set to 200.
The crimp was removed by raising the temperature to 4 ° C and passing it 4 times. As a result of observing the tips of the single fibers of this high pile, crimping was found to be insufficiently removed as compared with the examples, and therefore the texture was coarse and hard, and the hair sagability and gloss were inferior.

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Claims (1)

[Claims] 1. A polyester fiber obtained by heat-treating at 160 to 230 ° C. under a restricted shrinkage condition of 1 to 7% and then crimping in a yarn making step, and then dyeing the polyester fiber. A method for producing a napped fabric, which comprises forming a napped fabric as a fiber and subjecting the napped fibers to a polisher treatment.