JPS59130321A - Wet spinning - Google Patents

Abstract

PURPOSE:To obtain spun yarn without causing yarn unevenness and end breage, by predrafting a fiber bundle consisting of short fibers, wetting it, dehydrating it, drafting it mainly using rubber rollers having specific rubber hardness, subjecting it to false twist, drying and winding it. CONSTITUTION:The fiber bundle 1 consisting of one or plural kinds of short fibers is predrafted by black rollers 4 and 4' and the front rollers 5 and 5' in the predrafting zone 2, the fiber bundle 1 is supplied with water from the first water feed pump 6 and the second water feed pump 7 and wetted. The wetted fiber bundle 1 is pressed by the compression rollers 8 and 8' to remove excess water, water is further removed by the squeezing nozzle 9, the bundle is sent to the main drafting zone 3, drafted mainly by using rubber rollers as the back top rollers 10 and 10' and front top rollers having >=93 deg. (hardness of JIS) of rubber hardness of covered rubber, subjected to false twist, dried, and wound to give the desired spun yarn.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wet spinning method in which fibers or rovings (hereinafter referred to as fiber bundles) composed of one or more types of short fibers are wet-drafted, then false-twisted, dried, and wound. It is something.

Conventionally, wet spinning methods in which fiber bundles are moistened and drafted are disclosed in Japanese Patent Publication No. 50-7662 and Japanese Patent Application Laid-open No. 50-1.
The spinning speed described in Japanese Patent No. 32230 is known, but when the spinning speed is 200+Mmin or more,
The problem is that the fibers get wrapped around the wet draft rope, especially the top roller, resulting in frequent yarn unevenness and yarn breakage.

The method of the present invention aims to provide a wet spinning method to solve these problems.

That is, the present invention provides a wet spinning method in which a fiber bundle composed of one or more types of staple fibers is pre-drafted, then moistened, dehydrated, main-drafted, false-twisted, dried and rolled up. This wet spinning method is characterized by using rubber rollers whose coated rubber has a rubber hardness (JIS hardness) of 93 degrees or higher as the front top loaf and pack top roller in the main draft zone.

The method of the present invention will be explained in detail below.

FIG. 1 is a simplified side view of one embodiment of an apparatus for carrying out the method of the invention. One or more types of short fibers (
A fiber bundle (1) composed of a plurality of types of fibers (at least one of which is a hot water soluble fiber) is supplied to pack roller f4L (45 and front roller (5) + (ω and After pre-drafting, the fiber bundle (
1), water is first supplied from the first water supply nozzle yv (e), and if necessary, water is also supplied from the second water supply nozzle μ (7) to moisten it. In this case, the first water supply nozzle (6)
A vortex water supply nozzle is used for the second water supply nozzle (7), and a vertical jet water supply nozzle is used for the second water supply nozzle (7).

The wetting liquid may be water, oil, or an aqueous solution containing a sizing agent. Next, the moistened fiber bundle (1) is compressed by a compression roller (8).

(Compress the fiber bundle by hand to squeeze out the excess water and the fiber bundle (
After the moisture has penetrated into the inner layer of fiber bundle (1) to make it uniform, excess moisture is further removed by a squeezing nozzle (9) and the fiber bundle (1) is sent to the main draft zone (3). Next, the back loaf oO, u of the zone (3)
A main draft is applied by Q and front roller σn,on, but in this case, the rubber coating of pack top roller αQ and front top loaf (b) has a rubber hardness of 93.
Use a rubber roller with a hardness of J/S hardness or higher. Next, the drafted and spun from the front top loaf 0υ,
．． 0:i to form a yarn (1), which is dried and wound up using a drying device and a winding device (not shown).

In the method of the present invention, the pack top roller QQ and the front top roller O in the main draft zone are
A rubber having a rubber hardness of 93 degrees or more is used as the coating rubber for υ, which can prevent the fiber bundle (1) from rolling up on both top rollers, yarn unevenness, and yarn breakage. In other words, when using a rubber roller with a rubber hardness of less than 93 degrees,
Due to the high-speed rotation caused by high-speed spinning, the degree of deformation of the outer shape of the covered rubber roller becomes large, and the nip line that clamps the fiber bundle (1) becomes large in convergence. Since the fiber bundle (1) is pulled out while being clamped, it becomes difficult to properly pull out the fiber bundle (1), and as a result, the occurrence of yarn unevenness and yarn breakage due to the fibers winding around the dog lobes increases. On the other hand, in the method of the present invention, rubber rollers with a rubber hardness of 9'5 or higher are used for both the back and front top rollers in the main draft zone which rotate at high speeds such as 9 or higher, so the spinning speed is 200 m/min. Even in high-speed spinning exceeding 100 min, there is almost no deformation due to the high-speed rotation, and therefore, the fiber bundles are held normally, so the fiber pulling action is also performed properly, resulting in normal drafting and yarn unevenness. It is possible to prevent the occurrence of yarn breakage and yarn breakage, and the yarn quality and operability are significantly improved.

This will be explained in detail below using examples.

Example In the apparatus shown in FIG. 1, the rubber coating on the pack top roller and front top loaf in the main draft zone was changed to six levels of rubber hardness ranging from 80 degrees to 99 degrees. hot water soluble polyviny
〃Alcor〃Using the same Spiber (300 gelen/6 yards), which is a blend of 12% fiber and 88% cotton,
It is drafted 5 times in the pre-draft zone, then moistened with the first water supply nozzle and the second water supply nozzle, and the excess water is squeezed out with a compression roller and a squeezing nozzle. It is then drafted 24 times in the main draft zone, and the steam pressure is increased. 5- False twist with a 2.2 kq/d false twist nozzle ~ 4 Q
It was drawn out at a speed of 0m/min to form a yarn of 20 count (cotton count).

It was dried in a drying drum at 230°C and rolled up.

The number of loaf windings and the measured value of Worcester U% for each spun yarn are as shown in the following table.

As is clear from the above results, when spinning is performed using a coated rubber roller with a rubber hardness of 93 degrees or higher, which is an example of the method of the present invention, the number of loaf turns is much smaller and the Worcester U% is also lower. .

[Brief explanation of drawings]

FIG. 1 is a simplified side view of an embodiment of an apparatus for carrying out the method of the invention. (1)... Fiber bundle, ω... Yarn, (2)... Pre-draft zone, (3)... Main draft zone,
(6)...First water supply nozzle, (7)...Second water supply nozzle. +8), +85... Compression loaf, (9)... Squeezing nozzle. Moe...Back top loaf in main draft zone,
06... Pack pot mulots in the main draft zone, Ql)... Front top lobes in the main draft zone, 0 force... Front bottom lobes in the main draft zone, (2)... False twist nozzle. aa, d...Drawer row patent applicant Unitika Co., Ltd. 7-

Claims (1)

[Claims] (1) A wet spinning method in which a fiber bundle composed of one or more types of short fibers is pre-drafted, then moistened, dehydrated, main-drafted, false-twisted, dried and rolled up. A wet spinning method characterized in that rubber rollers whose coated rubber has a rubber hardness of 93 degrees or more (J/S hardness) are used as the front top loaf and pack top roller of the zone.