JPH06136611A - Production of fiber powder - Google Patents

Abstract

PURPOSE:To provide a process for cutting a polyester fiber or nylon fiber for flocky processing to extremely short fiber length in high productivity. CONSTITUTION:A polyethylene terephthalate fiber having a titanium oxide content of <=0.1wt.% and a single fiber denier of <=3de or a nylon fiber having an elongation of >=80% and a single fiber denier of <=3de is cut to <=2mm long with a cutter.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cutting polyester fibers and nylon fibers into extremely short fiber lengths with high productivity.

[0002]

2. Description of the Related Art Conventionally, short fibers called piles, which have been cut to a length of 2 to 1 mm or less with a cutter, are coated with an adhesive, and a heap of a woven or knitted fabric, a nonwoven fabric, wood, metal, plastic, etc. stands vertically. There is a processing method that gives a texture and feel similar to velvety by gluing like this and is called flocking. The fibers used for piles are often used because they are easy to cut and have good dyeability, but in recent years, nylon fibers have also been used because of their good texture, and the use of polyester fibers has begun to be considered. . However, when these synthetic fibers are cut into short pieces with a cutter, the blade of the cutter is worn very much, and particularly with polyester fibers, there is a problem that the blades cannot be practically produced because the blades need to be replaced in an extremely short time.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is to provide a method for cutting nylon fibers or polyester fibers into piles with high productivity.

[0004]

The present invention achieves the above object, and its gist is as follows. That is, the first invention of the present invention is that the content of titanium oxide is 0 or 0.1% by weight or less, the denier of single yarn is 3 denier or less, and the polyester fiber containing ethylene terephthalate unit as a main constituent component has a length of 2 mm or less. A second method of the present invention is a method for producing a fiber powder, which comprises cutting a nylon fiber having an elongation of 80% or more and a single yarn denier of 3 denier or less to a length of 2 mm or less. The gist is a method for producing a fiber powder, which is characterized in that it is cut with a cutter.

The present invention will be described in detail below. In order to obtain the method for cutting nylon fibers and polyester fibers into piles with high productivity, which is the target of the present invention, in the case of polyester fibers, titanium oxide is not contained or the content of titanium oxide is 0.1% by weight. Must be: Titanium oxide (fine powder is added as a dulling agent to eliminate glare in the fiber), which is often used for ordinary spun yarn applications, replaces the cutter for fibers whose content exceeds 0.1% by weight. It is not preferable because the frequency increases. It is preferable that the elongation is 30% or more because the frequency of exchanging the cutter tends to be low, but it is not particularly specified.

The polyester fiber used in the present invention must have a denier of 3 or less. Fibers having a denier of more than 3 denier are not preferable because they have a hard texture after flocking.

On the other hand, the nylon fiber used in the present invention must have an elongation of 80% or more and a single yarn denier of 3 denier or less. Fibers having an elongation of less than 80%, which are often used for ordinary spun yarns and non-woven fabrics, are not preferable because the frequency of exchanging the cutter increases. The titanium oxide content is 0.1
It is preferable that the content be less than or equal to wt% because the frequency of exchanging the cutter tends to decrease, but it is not particularly specified.

The nylon fiber used in the present invention must have a denier of 3 or less. Fibers having a denier of more than 3 denier are not preferable because the texture after the flocking is hard.

The polyester used in the present invention must contain ethylene terephthalate units as a main constituent, and preferably 90 mol% or more of the constituents are ethylene terephthalate units. The polyester of the present invention may contain isophthalic acid, 5-sodium sulfoisophthalic acid, adipic acid, sebacic acid, 1,4 as necessary for the purpose of increasing dyeability, as long as the object of the present invention is not impaired. -Butanediol, 1,6-
Other auxiliary materials such as hexanediol, diethylene glycol, and polyethylene glycol may be copolymerized, and various additives may be contained. The nylon fibers used in the present invention are nylon-6 and nylon-6.
6, Nylon-46 is suitable.

The fiber used in the present invention can be manufactured by a method generally following the prior art. That is, for the spinning, a general-purpose synthetic fiber melt spinning apparatus may be used. Also, when spinning,
A stabilizer, a fluorescent agent, a pigment and a reinforcing material may coexist. The cross-sectional shape of the fiber is round, cross-shaped, flat, hexalobal, W-shaped,
An irregular shape such as a triangular cross section or a hollow cross section may be used.

The spun fiber is drawn or heat-treated continuously or in a separate step, if necessary, and the elongation of the fiber can be controlled by the draw ratio.

In the case of any of the fibers, a guillotine cutter or other cutter is used to align the fibers into tens of thousands to millions of denier.
It is cut to a length of mm or less. Then, it is dispersed in water or treated in a dyeing solution to dye it in a desired color, and at the same time, the fibers are separated into individual pieces and then dried.

The separated powdered fibers are sent to a flocking process. Flocky processing methods include mechanical processing, electrostatic processing, hand-planting processing, and high-frequency processing, but general electrostatic processing is performed as follows. That is, the principle is that fiber powder is supplied to one side of an electric field to which a high voltage is applied, charged, accelerated in the direction of the base material coated with the adhesive and set in the other side of the electric field, and anchored in the adhesive.

As the adhesive, there are water-based acrylic emulsion type, solvent type polyurethane, epoxy, synthetic rubber and polyvinyl acetate type.

[0015]

As in the present invention, in the case of polyester fiber, if the amount of titanium oxide powder having high hardness is set to a specific value or less, abrasion of the blade of the cutter can be prevented and productivity can be improved. Further, in the case of nylon fibers, the reason why the wear of the blade can be prevented by increasing the elongation is not clear, but it is considered that the rigidity of the fiber itself becomes low.

[0016]

EXAMPLES Next, the present invention will be specifically described with reference to examples. The method of measuring the characteristic value is as follows.

(1) Fineness: JIS L-1015
It was measured by the method of 7.5.1. (2) Strength and elongation: JIS L-1015 7.7
Was measured by the method. (3) Guillotine cutter life: After starting cutting with a new blade, it was the time until the cut end face of the fiber tow was disturbed and miscut started to occur.

Example 1 Polyethylene terephthalate having a titanium oxide content of 0.02% by weight was spun using ordinary staple fiber manufacturing equipment, and then stretched at a slightly lower draw ratio than usual, without stretching and cutting.
A polyester tow having a fineness of 2 d, a single yarn strength of 5.3 g / d, a single yarn elongation of 48% and a total denier of 820,000 denier was produced. When this tow was cut into a 0.4 mm pile with a guillotine cutter, the cutter life was 1.2 hours. When the obtained pile was subjected to electrostatic flocking on a polyester fabric printed and dyed by a conventional method, a good product having a soft texture was obtained.

Examples 2 to 7 and Comparative Examples 1 to 2 Example 1 is repeated except that the content of titanium oxide, draw ratio, fineness, single yarn strength and single yarn elongation are changed. did. The results are shown in Table 1.

[0020]

[Table 1]

As is clear from Table 1, in all of Examples 2 to 7, the cutter life was as long as 1 hour or more, and when all the piles were subjected to the electrostatic flocking, they had good texture and good products. However, in Comparative Example 1 in which the titanium oxide content was high, the cutter life was short, and in Comparative Example 2 in which the fineness was large, the texture of the flocked product was hard.

Example 8 Nylon-6 having a titanium oxide content of 0.40% by weight was spun using a normal short fiber production facility, then drawn at a slightly lower draw ratio than usual and drawn and cut to a fineness of 2d, A nylon tow having a single yarn strength of 4.2 g / d, a single yarn elongation of 95% and a total denier of 750,000 denier was produced. When this tow was cut into a 0.4 mm pile with a guillotine cutter, the cutter life was 1.3 hours. When the obtained pile was subjected to electrostatic flocking by a conventional method, a good product with a soft texture was obtained.

Examples 9 to 13 and Comparative Examples 3 to 4 The procedure of Example 8 was repeated except that the titanium oxide content, draw ratio, fineness, single yarn strength and single yarn elongation were changed. did. The results are shown in Table 2.

[0024]

[Table 2]

As is clear from Table 2, Examples 9 to 13
Each had a long cutter life of 1 hour or more, and when each pile was subjected to electrostatic flocking, it became a good product with a soft texture. However, in the case of Comparative Example 3 in which the single yarn elongation was low, the cutter life was short, and in the case of Comparative Example 4 in which the fineness was thick, the texture of the flocked product was hard.

[0026]

EFFECT OF THE INVENTION By using the method for producing fiber powder of the present invention, the frequency of exchanging the cutter at the time of pile production is reduced, and the pile can be obtained with good productivity. The flocking process using this pile is applied not only to fibers but also to plastic and metal, and can be used for interior applications such as automobile interior materials and office partitions, and has a high industrial utility value.

Claims (2)

[Claims] 1. A polyester fiber having a titanium oxide content of 0 or 0.1% by weight or less, a single yarn denier of 3 denier or less, and an ethylene terephthalate unit as a main constituent component is cut into a length of 2 mm or less by a cutter. A method for producing fiber powder, comprising: 2. An elongation of 80% or more and a single yarn denier of 3
A method for producing a fiber powder, which comprises cutting nylon fibers having a denier or less to a length of 2 mm or less with a cutter.