JPS5982437A - Production of twistless yarn - 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 The present invention relates to a method for producing non-twisted yarn that enables stable operation.

Conventionally, methods for producing untwisted yarn from slivers or rovings (hereinafter referred to as fiber bundles) of various short fibers containing fibers that are potential adhesives are well known. The method uses a fiber bundle containing latent adhesive fibers and undergoes a wet drawing process, a false twisting process, a moisture supply process, a sliver viewing process by activating the latent adhesive component, and a drying process. , a method for producing non-twisted yarn has been proposed, but the purpose of this proposal is to prevent the sliver from being insufficiently strong and to prevent soiling of various parts of the equipment. A major feature of this method is that it can produce yarn at a speed of more than 300 meters/minute, which is more than 20 times faster than the method for producing spun yarn.

Although it is possible to obtain high productivity and is an extremely advantageous method from an industrial perspective, the number of yarn breakages is limited.

This will be a factor in determining whether or not to become a company. Therefore, the wet fiber bundle is
After the main draft, steam temporizing is carried out, and at the same time, the latent adhesive fibers contained therein are activated.

In a non-twisted yarn manufacturing method that employs a process in which the yarn is then led to a heating drum and dried, this yarn breakage mainly occurs due to inappropriate tension applied to the yarn traveling to the heating drum.

In view of the above points, an object of the present invention is to provide a non-twisted yarn manufacturing method that prevents yarn breakage by applying appropriate tension to the traveling yarn transferred to the heating drum and enables stable operation. It is something to do.

That is, the present invention wets and drafts a cotton fiber bundle containing hot water-soluble polyvinyl alcohol/l/fibers (referred to as PVA fibers), false-twists them with a steam false-twisting nozzle, and simultaneously prepares the PVA fibers. When manufacturing non-twisted yarn by activating and drying on a heating drum, the tension T9 (grams) of the running yarn of the spinning count (cotton count) Ne22 27 transferred to the heating drum after false twisting is determined as ≦T≦ This is a method for producing non-twisted yarn, which is characterized by spinning after adjusting the JTi range.

The configuration of one embodiment of the present invention will be explained in detail below. FIG. 1 is a conceptual explanatory diagram of a non-twisted yarn manufacturing process in which the present invention is implemented. A cotton fiber bundle (1) containing hot water soluble PVA fibers is placed in a back a-ra (4) of a pre-draft zone (2).

(4), a front roller (5), and tA', the fiber bundle (1) is pre-drafted, first water is supplied to the fiber bundle (1) from a water supply device (6), and then compression rollers (7), (f) and a squeezing nozzle/ By squeezing with L/(81), water is uniformly pressurized and infiltrated into the fiber bundle (1), and after squeezing out excess water, the main draft zone (3) back roller ('l), +9' J and front roller OQ, α
Main draft by d. Next, in order to prevent the yarn (1') spun from the front rollers ao and a6 from wrapping around the front rollers αa and Q6, a steam false twisting nozzle Qη gives false twist to the yarn α). and eject it forward. At this time, at the same time.

By activating and gelatinizing the hot water-soluble PVA fibers contained in the fiber bundle (1), the yarn (
Measure 00 strong hold. Next, it passes through the yarn guide (6),
The yarn (1) is run to a heating drum (13) under a predetermined tension, and activated and dried in the heating drum (a), and then wound as cheese α.Here, the untwisted yarn manufacturing method of the present invention In this case, by finely adjusting the rotational speed of the heating drum (supply) or adjusting the steam pressure of the steam false twisting nozzle Oυ, the value of the temperature that runs to the heating drum can be adjusted to a value within the range. 7 Main draft zone (3) front roller OQ, winding yarn (1) around α6, steam false twisting nozzle (b)
It is possible to prevent yarn breakage due to slack or shedding of the yarn α) that occurs between the heating drum and the heating drum. If the take-up speed of the yarn (1) of the heating drum 04 is too slow and the tension T applied to the yarn (1') is lower than the value of the hem (here, the yarn α) is Draft zone (3
) front roller OQ, Qd with 46"-1.1 tari.

Alternatively, the thread may become slack in front of the heating drum θa and breakage may occur.Also, the thread (A) may be picked up at an excessive speed by the heating drum 03 and the tension T applied to the thread (1') may be too high. When the total value is larger than the total value, the gelatinization of the hot water-soluble PVA fibers contained in the yarn <flp may be less than 1/1, and yarn breakage occurs due to shedding.

Also, the method of the present invention exhibits its effects best.

In order to minimize yarn breakage, preferably 1 condition 1, the blending rate of hot water soluble PVA fibers contained in the fiber bundle (1') is 5%.
1, and the spinning count Ne is set to 8'S, '5 to Δ0°S.

Since the method for producing a non-twisted yarn according to the present invention has a configuration of 9 or more, the tension T of the yarn traveling toward the heating drum is adjusted so that the value of T is 7i. , prevents thread breakage.

This is the greatest feature of this type of non-twisted yarn manufacturing method. This enables high-speed production of yarn. In particular, when the method of the present invention is carried out within the range of the above-mentioned preferred conditions, yarn breakage can be prevented almost regardless of the mixing ratio of hot water-soluble PVA m fibers, the spinning count, or the spinning speed. It enables stable operation with minimal production and greatly contributes to improving productivity.

Below are nine examples of the method of the present invention.

Example 1 From the untwisted yarn manufacturing method shown in Figure 1, Nuraiva (600 gel/6 yards) is a blend of 12% hot water soluble PVA fiber (1.4 denier) l/32 KM and 88% cotton. , 5 times pre-draft, 1.O from water supply device u
A nozzle that supplies water with a pressure of kg/d and squeezes it with a compression roller.

After measuring the uniform permeation of moisture in the fibers under pressure using a spherule and removing excess moisture, a draft of 20 times is applied in the main draft zone, and false twisting is performed at a steam pressure of 2 and 9/d using a steam false twisting nozzle. .

Wrap it around a heated drum at 220°C 40 times to dry.

It was wound up on a six-wheeler at a speed of 400 meters/min. The spinning count of the yarn in this case was 17°S, but by finely adjusting the rotation speed of the heating drum and changing the running tension of the yarn toward the heating drum, the corresponding average continuous The spinning time was as shown in Table 1.

Table 1 As shown in Table 1 above, when the running tension T applied to the yarn is 5~
In the case of 7g, yarn breakage is small, and the average continuous spinning time of T=6q is the longest.

Example 2 Fig. 1↓・Using the same sliver as in Example 1 according to the manufacturing process shown here, the main draft magnification was 66 times, 3
A yarn of 0'S was spun.

In this case, finely adjust the rotation speed of the heating drum.

When the running tension of the yarn transferred to the heating drum was incinerated, the corresponding average continuous fJ3M time was as shown in Table 2.

Table 2 As shown in Table 2 above, the running tension T applied to the yarn is 4~
In the case of 5Q, yarn breakage is small, and in particular, the average continuous spinning time of T=4.69 is the longest.

In addition, when spinning io's in the same way, the tension T = 7 ~
8.59, but when spinning 20'S, the tension T = 5~
6Q is an appropriate value that minimizes thread breakage.

[Brief explanation of drawings]

FIG. 1 is a conceptual explanatory diagram of a process for producing a twin-free yarn in which the method of the present invention is carried out. (1)... Fiber bundle, α)... Yarn, (2)... Pre-draft zone. (3)...Main draft zone, (6)...Water supply device, +7), (7)...Compression roller, (8...Squeezing nozzle, 0υ...Steam false twist nozzle, CL2...
・Yarn guide, (to)...Heating drum, G bleeding...Cheese. Patent applicant Unitika Co., Ltd.

Claims (1)

[Claims] A cotton fiber bundle containing heat-soluble polyvinyl alcohol fibers is moistened and false-twisted with a draft steam false-twisting nozzle, and at the same time, the polyvinyl alcohol fibers are activated and dried with a heated drum. A method for producing non-twisted yarn, which comprises adjusting the spinning range to transfer to a heating drum after false twisting.