JPS61108759A - Production of nonwoven fabric - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for producing a nonwoven fabric whose main constituent fiber is cocoon thread. More specifically, it is made of a non-woven fabric made of cotton mixed with the cocoon thread and other short fibers that can pass through oil. The present invention relates to a method for producing good nonwoven fabrics.

[Conventional problems]

Cocoon thread is inherently flexible, and if a nonwoven fabric can be produced using it, it should be possible to obtain a nonwoven fabric that has some flexibility.

As is well known, many cocoon threads have a nine-section structure in which two strands of fibroin are wrapped by sericin, and when this sericin is dissolved and removed, that is, scoured, the fibroin is separated and becomes independent, forming a single cocoon thread. is split into two, forming a much thinner fiber. However, if a non-woven fabric is produced using refined cocoon thread, it should be possible to obtain a non-woven fabric that is more supple and has a better feel than a non-woven fabric made from unscoured cocoon thread. This is currently difficult.

[Problem that the invention seeks to solve]

In the production of non-woven fabrics, the constituent fibers, cotton, must first be formed into a web.This web formation can be done using a card machine, but if cocoon yarn is to be used as the constituent fibers of the non-woven fabric.

The fibers of the cocoon thread after scouring are too thin, making it difficult to make it into a web using a card machine.Therefore, a method of making a web and then scouring is considered, but the scouring that follows after making a web disintegrates the accumulated state of fibers. In view of the above problem, the inventors of the present invention have solved this problem as a result of various studies.

[Means for solving problems]

By making a web of cocoon thread cut to an appropriate length or mixed cotton of cocoon thread cut to an appropriate length and an appropriate amount of other short fibers, then mechanically fixing the fibers to each other, and then scouring this. They succeeded in industrially and continuously manufacturing a non-woven fabric with evenly dispersed cocoon threads as constituent fibers, which is not bulky, flat, and has a supple feel.

The present invention uses cocoon thread as the main constituent fiber, and when making it into a non-woven fabric, the scouring step is substantially the final step,
This is preceded by a mechanical fixing process for the web-constituting fibers.

In other words, the essential constituent elements of the present invention are that after performing various pre-processes, if necessary, sequentially perform the following steps: web formation, mechanical fixation of fibers, and scouring. If the sequence is changed, the object of the present invention cannot be achieved.

In other words, the problem is that it is difficult to turn the cut cocoon threads of the scouring style into a web using a card machine or the like.

If the cut cocoon filament is scoured after being made into a web, the constituent fibers will separate and the shape of the web cannot be maintained.This problem can be solved by providing a step of mechanically fixing the fibers to each other between the web making process and the scouring process. The following is the solution:

In the present invention, the mechanical fixation of fibers to each other is mainly performed by needle punching or stitch bending, and in the case of needle punching, the /J punch density is so-, -ao.

It is preferable to set it to “puch/cm”.!;Opu c
h/cm”, the retention effect of the web is not sufficient in the next step of scouring, and on the other hand, ≠00p+i
When it is larger than ch~, the intertwining of the fibers is too strong and the fiber gaps, which are important as a heat insulating material, are too small. On the other hand, stitch-in binding may use either thread or web only.

In the present invention, scouring is performed as the final step, so if the fixation of the fibers is done by a method of attaching individual substances, such as using an adhesive, the scouring effect will be lost and the fibers will not be fixed. However, mechanical methods must be used to avoid damaging the texture.

In the present invention, in addition to processing the web alone in the order of steps and finally scouring it, it is also possible to overlap the textile fabric in the nip, mechanically fixing it, and then scouring it.

That is, the presence of the knitted fabric has a reinforcing effect on the final product, making it suitable for manufacturing products that require flexibility and strength. The knitted and woven fabrics may be stacked on one side, both sides, or in the middle of the web, or a combination thereof may be used.

In the present invention, in addition to cocoon filament alone as the constituent fiber of the web, it is recommended that the cocoon filament be mixed with other short fibers to use nine-mixed cotton. -0 weight- or less is preferable. 1
If the amount is more than 20% by weight, the original flexibility of the cocoon thread is impaired.Other short fibers as used in the present invention include bori ester, nylon, polypropylene, acrylic rayon, and the like.

〔Example〕

Example 1 Carding cocoon thread cut to approximately sows length
A web of oo p/- is formed, and this is needled with a ◆4c2 needle to a punch density/Dopuch/m", and then scoured by the soap wire method, which is one of the main wire methods for raw silk. A nonwoven fabric made of cocoon thread alone was obtained.

The nonwoven fabric obtained in the above manner is flat and has a very flexible feel. What's more, it has excellent heat retention, heat insulation, and moisture absorption properties, which are the inherent properties of cocoon thread.

Example.

70 layers of cocoon thread cut into approximately 5 pieces of length! : and 30 parts by weight of polyester fibers of length S/U and thickness of 2 denier are mixed, and this is carded/! Of/ly
After needling it with a felting needle of ÷lA2 so that it has a density of 0.1", it is then scoured by the soap wire method, which is one of the main wire methods for raw silk. Cocoon thread 70 fyyl
Obtained a non-woven fabric made of a mixture of JO% of lyester fibers. The Tsujiko woven fabric obtained in the above manner is flat, very supple and has a good feel.

It was excellent in heat retention, insulation, moisture absorption, etc., which are the inherent properties of cocoon silk.

〔Effect of the invention〕

According to the method of the present invention, it is possible to industrially and continuously provide a flat, supple nonwoven fabric with good feel, consisting of cocoon fibers alone or mixed cotton mainly composed of cocoon fibers. Ru.

Although the resulting nonwoven fabric is not expensive, it exhibits the original properties of cocoon yarn, and has excellent heat retention, heat insulation, and lightness, and can be used in a wide range of fields. Among these, it is effective as a heat-insulating core material for clothing, a wiping material for precision instruments, etc.

Claims (5)

[Claims] (1) Cocoon threads cut into appropriate lengths or mixed cotton made of cocoon threads cut into appropriate lengths and an appropriate amount of other short fibers are made into a web, and the fibers are then mechanically fixed together and then scoured. A method for producing a nonwoven fabric characterized by the following. (2) The method for producing a nonwoven fabric according to claim (1), wherein the means for mechanically fixing the fibers to each other is needle punching. (3) Cocoon filament cut to an appropriate length or mixed cotton of cocoon filament cut to an appropriate length and an appropriate amount of other short fibers is made into a web, and a knitted fabric is layered on one or both sides and/or in the middle. . A method for producing a nonwoven fabric, which comprises mechanically fixing the fibers to each other and then scouring the fibers. (4) The method for producing a nonwoven fabric according to claim (3), wherein the means for mechanically fixing the fibers to each other is needle punching. (5) The method for producing a nonwoven fabric according to claim (3), wherein the means for mechanically fixing the fibers to each other is stitch bonding.