JP2000272826A - Winding method for false twisted yarn - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a winding method for obtaining excellent false twisted yarn without cob-webbing and a dyeing speck generated at the time of winding false twisted yarn. SOLUTION: In an end face collapsing method for intermittently reducing a traverse width when false twisted yarn is wound on a package, a rate of change is increased before a shortest width and is reduced up to a position of the shortest width when the traverse width is changed from a longest width to the shortest width in one cycle changing the traverse width. When the traverse width is changed to a position of a longest part from a shortest part, winding is performed by increasing the rate of change before the longest width and reducing the rate up to a position of the longest width.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for winding false twisted yarns, and more particularly to a method for preventing unraveling of a package, having excellent unwinding properties, and less likely to cause uneven streaks when dyed into a woven or knitted fabric. The present invention relates to a method for winding a false twisted yarn into a package having uniform shape.

[0002]

2. Description of the Related Art Conventionally, as described in JP-A-58-78955 and JP-A-2-10080, etc., the swing width of a traverse is set to a value shown in FIG. There is a method of changing with time, such as FIG. 3 is an enlarged view of the changed portion Z shown in FIG. 2, and patterns such as (1) to (3) are known. In particular, (2) and (3) are for preventing the package from falling off. When the traverse swing width changes from the shortest width to the longest width, the package is characterized in that the average change rate of the traverse swing width with respect to the time when the end face position is changed is changed from a large change rate to a small change rate, and a package. There are many thread pools on the end face. However, in the conventional method, when winding is performed at a high winding tension, prominent portions of the inner layer yarn of the package coming from the yarn pool on the end face intensively interfere with the drive roller rotating at a high speed, and dye spots on the end face of the package occur. Had been a problem.

In order to prevent yarn spots on the end face of the inner layer of the package, it is better to reduce the number of thread pools on both end faces of the package as much as possible. It was extremely difficult to satisfy both well.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a winding method for obtaining an excellent false-twisted yarn which is free from abrasion and dyeing spots at the time of winding the above-mentioned conventional false-twisted yarn. That is the subject.

[0005]

The method of winding a false twisted yarn of the present invention to achieve the above object is as follows.

[0006] In the end face breaking method in which the traverse width is intermittently changed when the false twisted yarn is wound into a package, the time required for changing the traverse width from the longest width to the shortest width in one cycle of changing the traverse width is t1. , The time from the shortest width to the longest width is t2, the difference between the longest width and the shortest width of the traverse on one end surface of the package is L1, and the average change rate of the traverse width with respect to time t1 is α (= L1
/ T1), while changing from a change rate larger than α to a change rate smaller than α, decreasing from the longest width to the shortest width, and then setting the average change rate of the traverse width with respect to time t2 to β (= L1 / t2). A method of winding a false twisted yarn that is wound up while increasing from the shortest width to the longest width while changing from a change rate larger than β to a change rate smaller than β.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An end face breaking method according to the present invention will be described below.

[0008] The end face collapse is a method of changing the swing width of the traverse under certain conditions in order to prevent the end faces of the package from standing up. Here, the greatest feature of the present invention is that, as shown in FIG. By providing a point A at which the change rate of the traverse width changes (hereinafter referred to as a traverse change point) outside the straight line XY that changes from the longest width to the shortest width, the yarn accumulation on the package end surface can be reduced as much as possible. When the width changes from to the longest width, the traverse change point B is provided inside the straight line YZ to increase the number of yarn pools on the package end face, contrary to the above. When the time required to change the traverse width from the longest width to the shortest width is t1, and the difference between the longest width and the shortest width is L1, the traverse change point A is 7 of t1.
0 to 90% to 85% of L1 from point X which is the longest part
And then to the shortest part are excellent in terms of both dyeing spots and bleeding, and have a remarkable effect especially in a winding method using a surface drive method, and are preferably applied.

In a preferred embodiment for further exhibiting the effects of the present invention, the collapse ratio of the end surface collapse is 30 to 30 times the winding time.
70%, ribbon break cycle 9-60 seconds, twill angle 1
The condition of 0 to 18 ° and the taper angle of the package of 0 to 13 ° can be applied.

In carrying out the edge breaking method of the present invention, there is a method in which a servomotor or the like is used and a temporal change of the edge breaking is controlled by a sensor which detects a moving point of the edge breaking.

As described above, when the traverse width is changed from the longest width to the shortest width in the winding method according to the present invention, the edge of the package end face is prevented, and when the traverse width is changed from the shortest width to the longest width, the conventional method is used. In the same way as above, by increasing the number of yarn pools on the end face of the package, the ears can be made to stand out and prevent the twill drop, so that the twill drop and dye spots can be prevented.

[0012]

EXAMPLE Polyester drawn false twist yarn 167 dtex-
The 48 filament yarn was wound around a paper tube by a surface drive method by rotation of a drive roller. The paper tube used had a total length of 290 mm and an outer diameter of 65 mm. The processing speed is 800m / min, the traverse is 240mm,
Winding was performed at 460 cpm, one type used a wooly yarn heat-set only at the time of drawing false twist, and the other type used a set yarn heat-set again after untwisting, and carried out three types of traverse width change patterns. The breaking ratio of the end face break is 65% of the winding time, the ribbon break cycle is 9 seconds, and the twill angle is 16
° and a taper angle of 0 °.

The results are shown in Table 1. Type 1 is Fig. 3
(1) Type 2 was performed with the traverse width change pattern shown in FIG. 3 (3), and Type 3 was performed with the traverse width change pattern shown in FIG. Time t1, time t2,
The amount of change L1 was the same. The traverse change point of type 2 is 20% of time t1 and 5% of L1 from the longest width, type 3
Traverse change point A is 80% of t1, and L
1 to 94%. The package was obtained and the wound yarn was knitted in a tube. ○ indicates that there is no problem at all, Δ indicates that there is a possibility of a problem depending on the winding weight, and x indicates that the problem is at a problem level.

In type 3, a false twisted yarn having no problem of twilling and spotting was obtained.

[0015]

[Table 1]

[0016]

As described above, by the method of the present invention, it is possible to obtain a drawn false twisted yarn which can prevent a twill drop and hardly cause dye spots.

[Brief description of the drawings]

FIG. 1 is a traverse width change pattern of the present invention.

FIG. 2 is a diagram showing a temporal change of a traverse width.

FIG. 3 is a conventional traverse width change pattern.

Claims (3)

[Claims] 1. An end face breaking method for intermittently reducing a traverse width when winding a false twisted yarn into a package. In one cycle of changing the traverse width, the traverse swing width is changed from the longest width to the shortest width. Time of t
1. The time from the shortest width to the longest width is t2, and the difference between the longest width and the shortest width of the traverse on one end surface side of the package is L1.
And the average rate of change of the traverse width with respect to time t1 is α
(= L1 / t1), while changing from a change rate larger than α to a change rate smaller than α, the length is reduced from the longest width to the shortest width, and then the average change rate of the traverse width with respect to time t2 is β (= L1 / t2). ), A method of winding a false twisted yarn that is wound up while increasing from the shortest width to the longest width while changing from a change rate larger than β to a change rate smaller than β. 2. When changing the traverse width from the longest width to the shortest width, the inflection point at which the change rate changes is 70 to 90% of t1.
The method for winding false-twisted yarn according to claim 1, wherein the ratio is 85 to 95% of L1. 3. The method for winding false-twisted yarn according to claim 1, wherein the winding method on the package is a surface drive method.