JPH0742617B2 - Winding method for synthetic fiber yarn - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for winding a synthetic fiber yarn as a parn by a draw twisting machine.

(Prior Art) In recent years, various attempts have been made to combine different fiber materials into a composite yarn having functionality that cannot be obtained by a single material. For example, a composite fiber yarn and a natural fiber are combined. However, composite yarns that take advantage of the advantages of both have been made.

In this case, for example, JP-B-44-16825 and 53-36049
As disclosed in Japanese Unexamined Patent Publication (Kokai), a method of electrically opening a synthetic fiber yarn (multifilament yarn) and compounding it with a spun roving of natural fiber is adopted.

When a synthetic fiber yarn is used for such a composite yarn, it is necessary to be non-twisted in order to obtain a continuously stable open state.

In the synthetic fiber yarn manufacturing process, it is possible to wind in a non-twisted state by using a draw winder that does not twist, but when unwinding in the axial direction of the bobbin, untwisting occurs, so it is stable. Unopened state cannot be obtained. If the bobbin is unwound while rotating it from the direction perpendicular to the bobbin axis, it can be pulled out without twisting, but this requires a special device, which is not preferable in terms of space, cost, and management. . As proposed in Japanese Patent Publication No. 51-29217, if a method of rotating the bobbin only by the tension of the drawn yarn is adopted, no special device is required, but with this method, the bobbin must be a fairly thick yarn. Cannot give the tension required to rotate.

(Problems to be Solved by the Invention) The present invention is a synthetic fiber yarn that can be pulled out in a twisted state without requiring a special device and that can continuously obtain a stable opened state. It is intended to provide a method for winding up.

(Means for Solving the Problems) As a result of intensive studies to solve the above-mentioned problems, the present inventors have taken up a twisted parn using a draw twisting machine in the process of manufacturing a synthetic fiber yarn, By unwinding from the bottom side (the side where the bobbin is fitted to the spindle is called the bottom side and the opposite side is called the top side), the twist in the pan state is canceled by the untwisting, and the above purpose is achieved. The inventors have reached the present invention by finding that they can be achieved.

That is, the gist of the present invention is as follows.

When winding a synthetic fiber yarn as a parn by a draw twisting machine, the synthetic fiber yarn is wound from the beginning to the end of the winding while controlling the spindle speed so that the number of twists satisfies the following formula. How to wind a strip.

T = 1 / πD [T represents the number of twists (t / m), and D represents the winding diameter (m). The present invention will be described in detail below.

Generally, when a synthetic fiber yarn using a draw twisting machine is wound up as a parn, a twist of about 1 to 20 t / m is applied. This twisted pattern is usually unwound from the top side, but when unwound from the top side, untwisted twist is added. However, when unwound from the bottom side, the untwisting twist acts in the negative direction (that is, the twisting direction opposite to that of the yarn). The number of untwisted twists is the reciprocal of πD. Therefore, if the winding is wound while controlling the spindle speed so that the number of twists at the time of winding becomes the reciprocal of πD from the beginning to the end of winding, and the obtained pan is unwound from the bottom side, the drawn yarn Is untwisted.

FIG. 1 shows the states of the number of twists during winding, the number of twists during unwinding, and the number of twists after unwinding in the case of winding by the method of the present invention and the case of winding with the spindle rotation speed kept constant. It is the figure which showed typically.

In FIG. 1, symbols represent the following states.

A ₁ : The number of twists required when winding by the method of the present invention B ₁ : The number of twists required when winding when the spindle rotation speed is constant C: Unwinding the parn from the top side When twisted, the number of twists when unwinding D: The number of twists when unwinding the pan from the bottom side A ₂ : Unwinding when the pann wound by the method of the present invention is unwound from the bottom side after the twist B _2: as apparent from Figure 1 the number of twists solutions舒後in the case of unwinding pirn which wound by the spindle speed constant from the top side, was wound by the method of the present invention If you unwind the pan from the bottom side, the number of twists after unwinding is 0
Can be

(Example) Next, an Example is given and this invention is demonstrated.

Example 220d / 36f unstretched yarn obtained by melt spinning polyethylene terephthalate at a spinning speed of 1400 m / min was fed to a draw twisting machine and a draw ratio of 3.0 times and a draw speed of 820 m / After drawing in minutes, it was twisted by a twisting mechanism consisting of a ring and a traveler, and a 75d / 36f stretched yarn was wound as a 3kg wound parn.

At this time, the spindle rotational speed at the beginning of winding was set to 10500 rpm and the spindle rotational speed at the end of winding was set to 4020 rpm, and the spindle rotational speed was controlled so as to satisfy T = 1 / πD during that period.

The obtained pan was mounted on a creel of a spinning machine equipped with an electric opening device and unwound from the bottom side. on the other hand,
Wool and polyester short fibers were mixed and made into roving. The drawn yarn was pulled out from the pan while continuously opening the fiber at a yarn speed of 6.7 m / min and an electrode voltage of 4000 to 5000 V, mixed with the roving and spun to obtain a 173d composite yarn.

The spread state of the drawn yarn unwound from the pan was stable and stable, and a composite yarn in which wool a, polyester short fibers b and polyester filament c were uniformly mixed was obtained. A micrograph of the cross section of the obtained composite yarn is shown schematically in FIG.

Comparative Example Instead of the drawn yarn in the example, the spindle speed was changed.
A composite yarn was obtained in the same manner as in the example, using a pan that was wound at a constant rate of 8360 rpm and unwound from the top side.

Although the drawn yarn unwound from the bun opens intermittently,
The open state was unstable, and the polyester filament was a biased composite yarn. FIG. 3 shows a schematic view of a micrograph of the cross section of the obtained composite yarn.

(Effects of the Invention) According to the present invention, the winding of a synthetic fiber yarn that can be pulled out in a non-twisted state without requiring a special device and that can continuously obtain a stable opened state A picking method is provided.

[Brief description of drawings]

FIG. 1 shows the states of the number of twists during winding, the number of twists during unwinding, and the number of twists after unwinding in the case of winding by the method of the present invention and the case of winding with the spindle rotation speed kept constant. Fig. 2 is a diagram schematically showing a cross-sectional micrograph of the composite yarn obtained in the example, and Fig. 3 is a cross section of the composite yarn obtained in the comparative example. It is the figure which showed typically the microscope picture of the surface.

Claims (1)

[Claims] 1. When winding a synthetic fiber yarn as a bun by a draw twisting machine, it is wound from the beginning to the end of winding while controlling the spindle speed so that the number of twists satisfies the following formula: And method for winding synthetic fiber yarn. T = 1 / πD [T represents the number of twists (t / m), and D represents the winding diameter (m). ]