JPS60252726A - Method of web untwistable spinning - Google Patents

Abstract

PURPOSE:To subject stable fibers to web untwistable spinning in an improved spinning tone without causing loss of size, contamination of device by size, etc., by wetting a fiber bundle, drafting it, twisting it falsely, providing it with a size, drying, and winding it. CONSTITUTION:The fiber bundle 1 is wetted by the wetting device 2, and predrafted by the predrafting zone 5 consisting of the back rollers 3 and 3' and the middle rollers 4 and 4'. It is successively drafted mainly by the main drafting zone 7 consisting of the middle rollers 4 and 4' and the front rollers 6 and 6'. Then, it is falsely twisted by the false twist device 8 to give the untwistable yarn 1', which is provided with the size solution 12 by the size feeder consisting of the rollers 9 and 10 and the size solution tank 11. The yarn is then dried by the drying drum 13, and wound as the cheese 15 by the winding drum 14.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Field of Application The present invention is used for wet twistless spinning of staple fibers.

(B) Prior Art Conventionally, a conventional wet twistless spinning method for stable fibers is generally known, in which a size liquid is used as a wetting liquid to produce fiber bundles such as slivers or rovings (hereinafter referred to as fiber bundles). ), there is a method in which the fiber bundle is moistened before drafting, then drafted, pre-combusted and spun, and a method in which a size solution is applied after drafting the fiber bundle, pre-combusted and then spun.

As for the former method, for example, Japanese Patent Publication No. 51-119852
It is described in the above publication, and the fiber bundle is moistened with a size liquid, drafted, then pre-combusted, dried, and wound up. Furthermore, in relation to this method, when the fiber bundle is wetted and drafted, it is shown in Japanese Patent Application Laid-Open No. 58-8138 that it is necessary to draft the fiber bundle at a moisture content of 250 to 350%. On the other hand, after drafting and temporarily burning a fiber bundle with a moisture content of 250 to 350%, the moisture content of the fiber bundle is 90 to 1.
This decreases to 10%.

Therefore, in the former method, the fiber weight is 140 to 26
The 0% size liquid falls off during the draft or is scattered during the rotation for false twisting, resulting in problems such as contaminating the area around the device and wasting a large amount of size liquid. Also, as the latter method, for example, Utility Model Publication No. 37-5833
Although this method is described in the above publication, the fiber bundle is wetted with a size liquid after being drafted, and then false-twisted. Therefore, the false-twisting has the effect of drying the fiber bundle, but the A large amount of size liquid is scattered due to the rotational force caused by twisting, and the applied size liquid cannot contribute to improving the yarn strength, making it difficult to obtain a yarn quality suitable for high-speed spinning. Therefore, according to an example of this method, 1, the spinning speed is about 40 m/min, and high-speed spinning of Loom/min or higher is completely undesirable. There are problems such as accumulation and yarn breakage, which makes long-term spinning difficult.

(c) Problems to be solved by the invention The present invention solves the problems of the conventional method as described above, and
The object of the present invention is to provide a wet hot spinning method that causes less loss of size solution and less contamination of equipment, and can provide yarn quality suitable for high-speed spinning.

(D) Means for Solving the Problems The present invention is a method of wet non-twist spinning, which is characterized in that the fiber bundle is wetted, drafted, pre-combusted, applied with a size solution, dried, and wound up. It's a method.

FIG. 1 is a simplified side view of an apparatus for carrying out the invention. Fiber bundle (1) by wetting device (2)? i1 wet, hack roller (3), ti) and middle roller (41
, (4'l), followed by main drafting in the main draft zone (7) consisting of middle roller +4), (4) and front roller (61, (φ), Next, the temporary device (8)
After setting the yarn (n), the sizing roller (9), the pick-up roller, and the size tank (11)
A size liquid (12) is applied using a size liquid (1) consisting of
4) and roll it up as cheese (15). The wetting of the fiber bundles (J, l) before pre-drafting by the wetting device (2) can be done using water, and the amount of size applied to the non-twisted yarns (]j depends on the concentration of the size liquid (12) and It can be adjusted by adjusting the pick-up rate, and the yarn strength can be controlled by adjusting the amount of applied glue.

(e) Function In the present invention, as described above, water is used to wetting the fiber bundle (1) before pre-drafting, and the application of size liquid to increase the strength of the yarn is carried out temporarily afterward. Because of this, the size liquid does not fall off or scatter after application, and therefore the size liquid directly contributes to the yarn strength direction.

In other words, applying a size liquid after false twisting, drying and winding prevents loss of size liquid and contamination of equipment in high-speed wet no-twist spinning at a spinning speed of 100 m/mjn or more. This is an essential requirement for forming loose threads.

(f) Example Example I.

Using the apparatus shown in Figure 1, sliver of 100% cotton (30%
0 slope/6 yards) is moistened with water using a moistening device,
After drafting with a 5x pre-draft and a 24x main draft, and performing false twisting using a pre-combustion device, a 15% concentration polyacrylic acid ester aqueous solution was used as a size solution, and a size solution was applied using a size solution applicator ( Size liquid adhesion amount 15% to fiber),
It was dried in a drying drum at 200°C and wound at 400 m/min to obtain a yarn with a cotton count of 20'S. In this case, the size liquid did not fall off or scatter, the spinnability was good, and the yarn strength was 192 on average.
It was g.

Example 2゜100% linen sliver (70 gelens/6 yards)
The material is moistened with water using a wetting device, drafted using a 2.5 times pre-draft and a 7.5 times main draft, and subjected to false twisting. 8% (based on fibers) was applied using a size liquid applying device, dried in a drying drum at 200°C, and
A non-twisted yarn with a cotton count of 10'S was produced by winding the yarn in an in-line manner.

For comparison, as conventional method (2), the size liquid consisting of the 15% concentration polyacrylic acid ester aqueous solution used in the above example was used as a wetting liquid for the linen sliver before pre-drafting, and 300% (to the fibers) was applied. , otherwise draft false twisting and drying under the same conditions as in the previous example at 150 m/min.
I wound it up.

In addition, as conventional method (2), the linen sliver is moistened with water before pre-drafting, and after drafting, 8% (based on the fibers) of the above-mentioned size liquid is applied, followed by pre-combustion and drying. It was wound up at a speed of 30 m/min. In this case, 5
Spinning was impossible at a speed of 0 m/min or higher.

The thread breakage rate, average tenacity, and size solution usage rate in each case are as shown in Table 1.

Table 1 As is clear from Table 1, productivity (spinning speed).

The force of the present invention was superior to that of the conventional method in terms of spinning (thread cutting rate), yarn quality (average tenacity), and production cost (size solution usage).

(g) Effects of the invention As described above, the present invention applies the size liquid after the initial process, so there is no step of dropping or scattering the size liquid after that, and all the applied size liquid is applied to the yarn. This contributes to improving the quality of the yarn, and it is possible to obtain untwisted yarn with good spinning properties and excellent yarn quality at high speed, with less loss of size agent and contamination of equipment by the size agent. That is, the wet twistless spinning method of the present invention enables long-term continuous high-speed spinning at low cost with good spinning properties, which could not be achieved with conventional methods.

[Brief explanation of the drawing]

FIG. 1 is a simplified side view of an apparatus for carrying out the invention. +11...Fiber bundle, +1'+...Non-twisted yarn, (2)
...Wetting device. (5)...Pre-draft zone. (7)...Main draft zone, (8)...Preliminary combustion device. (9)...Sizing roller, (13)...Drying drum. (15)...Cheese patent applicant Unitika Co., Ltd. agent Patent attorney Shigeki Okumura

Claims (1)

[Claims] +11 A wet non-twist spinning method characterized by moistening a fiber bundle, drafting it, false twisting it, applying a size liquid, drying it, and winding it up.