JPS6042301B2 - Method for drawing thick synthetic fiber filament - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a method for drawing multifilaments of synthetic fibers with a large total fineness, and more specifically, a method for improving the drawability of undrawn multifilament yarns of large fineness and making the yarn performance more uniform. Regarding how to get .

Thick multifilament synthetic fibers, especially nylon and polyester fibers, have excellent mechanical properties and are therefore used as materials for industrial materials.

For example, it is useful as a material for tire cords, canvas, turbolin, fishing nets, ropes, etc. The yarn materials for these materials, such as tire cords and ropes, require performance such as high strength, high elasticity, and dimensional stability, so they are manufactured by subjecting undrawn yarn to high stretching ratios and high temperature heat treatment. However, under these severe drawing conditions, it not only causes a significant deterioration in drawing operability, but also reduces the quality of the product yarn. The purpose of the method of the present invention is to improve the drawability of undrawn yarn and improve its quality when producing thick multifilaments of synthetic fibers for industrial materials.

The present invention can be applied to polyester, polyamide fibers, etc., but particularly when applied to undrawn fibers having an undrawn yarn fineness of 3000 deniers or more, remarkable effects are exhibited.

In the conventional drawing heat treatment method for thick yarn, various drawing heat treatment conditions have been proposed, but the draw ratio is extremely unstable when drawing undrawn polyester or polyamide yarn. Stretching is performed by lowering the stretching speed, dividing the film into multiple stages, or lowering the stretching speed. The present inventors have studied various causes of these problems and have arrived at the present invention.

That is, when drawing an undrawn yarn of thick synthetic fibers, the present invention applies a tension of 0.0H to 0.2g1d, and the undrawn yarn bundle width of the undrawn yarn package in the undrawn yarn package. By making the yarn bundle width half,
This method of drawing thick synthetic fiber filaments is characterized in that each filament is introduced into a supply roller and drawn so as to change the relative position of each filament in the undrawn yarn.

Normally, in the production of thick multifilament yarn, the spinning speed is about 200n11m1 to 600n11m1n, and undrawn yarn with a lower degree of orientation than yarn for general clothing is used for drawing.In the case of thick yarn, the number of filaments is large. Because the fineness of the single filament is large, the amount of moisture and oil adhering in the direction perpendicular to the fiber direction (hereinafter referred to as the yarn bundle width direction) is often not uniform. Due to the hole arrangement in the spinning nozzle during spinning, it is almost impossible to make the cooling conditions etc. exactly the same, resulting in filament unevenness in the yarn bundle width direction.Furthermore, when forming the package in the winding process The traverse tension of the yarn, the yarn pressure inside the package, and the moisture content and oil content distribution at the package end face are factors that prevent undrawn yarn performance from being utilized to its fullest.Usually, undrawn yarn unwound from an undrawn yarn package. In the case of multifilament, it has a flat shape that expands in the yarn width direction due to the yarn pressure of the package, yarn tension, etc. Also, when the undrawn yarn is on the supply roller, it has a flat shape due to the yarn tension. In the conventional drawing method, the undrawn yarn is unrolled from the package and introduced onto the supply roller in a flat shape. Yarn swinging, unraveling, fluffing, etc. were occurring.As a result of examining various factors such as those mentioned above, the present inventors have found a way to physically eliminate the factors that cause defects that cannot be controlled when manufacturing undrawn yarn. It has been found that stretching operability can be improved by equalizing and supplying it to a stretching machine.

That is, the undrawn yarn is 0.01 (11d to 0.2yId
at a tension of, preferably 0.02 to 0.1y1d,
And in an undrawn yarn package. The undrawn yarn is introduced into a supply roller and subjected to drawing while changing the relative position of each filament in the undrawn yarn by making the yarn bundle width approximately half of the undrawn yarn yarn bundle width. This is achieved by For example, in the drawing process of polyester fibers, heating rollers are used, but according to the method of the present invention, the undrawn filaments are mixed and the filaments are introduced into the supply roller so as to change the relative positions of each filament in the undrawn yarn. At the same time, the distribution of moisture, oil, etc. tends to be evened out, and yarn wobbling, looseness, and fuzz generation during stretching are reduced, making it possible to set a high stretching ratio and improving the quality of product yarn. It becomes possible to effectively demonstrate performance.

In the present invention, changing the relative position of each filament in the undrawn yarn means that the position of each filament in the undrawn yarn is changed between the flat state in the package of the undrawn yarn and the flat state on the supply roller. The goal is to ensure that they are not the same.

To change the relative position of each filament in the undrawn yarn, a guide that can change the bundle width of the undrawn yarn is provided, and the undrawn yarn is run through the guide to form a flat undrawn yarn. The yarn bundle width in the longitudinal direction may be approximately half the yarn bundle width of the undrawn yarn bundle in the undrawn yarn package.

Hereinafter, a specific example of the drawing method of the present invention will be explained with reference to the drawings. FIG.
The film is then stretched between a supply roller 3 and stretching rollers 4 and 5, and then wound into a package 6. 7 is a separate roller in which the winding pitch of each roller is adjusted.

Here, the yarn Y is sometimes introduced while being applied with tension before the supply roller 3 in order to prevent the yarn from wobbling on the supply roller 3; It is easy to cause injuries, fuzzing, and cutting. FIG. 2 is a partially simplified diagram of the drawing device for explaining the present invention, in which the yarn Y from the undrawn yarn package 1 passes through the guide 2 to the tension applying device 8, and the weft bundle width is approximately halved. The yarn is wound around the supply roller 3 and the separate roller 7 through a yarn bundle width regulating guide device 9. It is then wrapped around a stretching roller (not shown) having separate rollers,
It is stretched between them and wound into a package.

FIG. 3 shows a specific example of the yarn bundle width regulating guide device 9 for approximately halving the yarn bundle width.

Usually, undrawn yarn Y unrolled from an undrawn yarn package
As shown in part A of FIG. 3, the yarn has a flat shape that expands in the yarn width direction due to the yarn pressure of the package, yarn tension, etc. In the yarn bundle width regulating guide device 9, as the yarn Y progresses from section A to section 8, the yarn bundles are folded so as to overlap each other so that the yarn bundle width becomes approximately half of the yarn bundle width in the undrawn package. In this way, the yarn bundle width of the undrawn yarn is approximately halved, and the yarn tension is set in the range of 0.01 to 0.2 yId to the supply roller 3 while changing the relative position of each filament in the undrawn yarn. By introducing this, the undrawn yarn is mixed, and at the same time as the filaments are aligned, the distribution of moisture, oil, etc. tends to be equalized, resulting in yarn wobbling during drawing and yarn coming loose on the drawing roller. This reduces the occurrence of , and improves the drawability, making it possible to effectively bring out the performance of the yarn.

Note that the device for approximately halving the yarn bundle width is not limited to the yarn bundle width regulating guide device shown in FIG.
Any structure may be used as long as it can exhibit the above-mentioned effects.

Further, if sufficient tension can be applied by a device for approximately halving the yarn bundle width, it is not necessary to provide a tension applying device. Example: Undrawn polyester yarn 10,000c1/300f was drawn using a drawing machine similar to that shown in FIG. 2. The results are shown in Table 1.

In addition, the supply roller temperature is 110'Cll, the stage drawing roller temperature is 100°C, the second stage drawing roller temperature is 170'C, the winding speed is 30 degrees and 1 min, and the number of threads wound around each roller is 8 times, 4 times, and 10 times, respectively. The second stage stretching ratio is 1.2 times.
It was doubled. The evaluation of stretchability in Table 1 is based on a comparison of cutting during stretching and drawing fluff. The criteria for the evaluation are O: no cutting during stretching, and within 10 rolls/100 kg (drawn yarn) of roller wrapping, and Δ: stretching The roller-wrapped fluff was less than 30 times/100 kg (drawn yarn) without medium cutting, and the x mark indicates that there was stretching cut or the roller-wrapped fluff was 30 times/100 kg (drawn yarn) or more.

As is clear from the table above, NO. l, 2, 3, 5, 7, 8
are those to which the stretching method of the present invention is applied, and in particular, No.
2, 3, 5, 7 are NO. It has much better stretchability than 4 and 6.

In addition, NO. 4 and 6 indicate that good stretchability cannot be obtained only by adjusting the tension immediately before the supply roller.

[Brief explanation of drawings]

Fig. 1 is a simplified diagram of a drawing device for implementing the conventional drawing method, Fig. 2 is a partially simplified diagram showing an example of a drawing device for carrying out the drawing method of the present invention, and Fig. 3 is a simplified diagram of a drawing device for carrying out the drawing method of the present invention. FIG. 2 is a perspective view showing a specific example of a regulating device. Y... Yarn, 1... Unstretched package, 3... Supply roller, 4, 5... Stretching roller, 7... Separate roller, 8... Tension applying device, 9... Thread bundle width regulation guide device.

Claims (1)

[Claims] 1. When drawing the undrawn yarn of thick synthetic fibers, the undrawn yarn is stretched at a tension of 0.01 g/d to 0.2 d/d, and approximately half of the bundle width of the undrawn yarn in the undrawn yarn package. A method for drawing thick synthetic fiber filaments, which comprises introducing the filaments into a supply roller and drawing them so as to change the relative position of each filament in the undrawn yarn by adjusting the yarn bundle width.