JPH05193830A - Winding method for elastic yarn - Google Patents

Abstract

PURPOSE:To provide a winding method for an elastic excellent in extensibility while eliminating a trouble of damage, break, etc., of the yarn generated as a cause of contact with the fellow adjacent elastic yarn when it is wound. CONSTITUTION:A spinned elastic yarn (y) is wound on a winder 3 through godet rollers 1, 2 to form a winding yarn unit 6, but when a winding width of the winding yarn unit 6 begins to decrease, a detection value of a tensiometer 4, provided between the godet roller 2 and the winder 3, is transmitted to a controller 5, here to feed a signal to a driving motor, not shown, of the godet roller 2, and winding tension is controlled so as to satisfy a fixed winding tension range by controlling a rotational speed of the driving motor.

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 an elastic yarn wound body, and more particularly, to damage or breakage of yarn caused by contact between elastic yarns due to traverse during winding. The present invention relates to an elastic yarn winding method that solves the above problems and is excellent in unwinding property.

[0002]

2. Description of the Related Art A wound body of an elastic yarn needs to be unwound when it is used, but in that case, especially the outermost layer is often twilled. As a countermeasure, reduce the winding width of the outer layer part,
Measures such as adhering the threads of the outer layers have been taken.

However, when winding the elastic yarn, if the winding angle of the outer layer is increased to reduce the winding width of the outer layer, the elastic yarns of the adjacent weights come into contact with each other to damage or break the yarn. There is a problem of causing.

Therefore, in order to prevent the elastic yarns of the adjacent weights from contacting each other, the following two methods have been roughly adopted.

(1) A method of increasing the winding tension to prevent the yarns from coming into contact with each other, (2) A partition plate provided in the winding machine to prevent the yarns from coming into contact with each other,
Others.

[0006]

However, each of these methods has the following problems.

With respect to (1), there are problems that the winding tension is high, the quality of the elastic yarn is impaired, the twisting during winding is increased, and the paper tube is crushed by winding.

Regarding (2), although it is possible to prevent the yarns from coming into contact with each other, the yarns come into contact with the partition plate instead.
In many cases, the yarn is instantaneously attached to the partition plate to cause tension fluctuation and breaks, and the quality of the yarn is likely to damage the yarn surface, which is not preferable.

The object of the present invention is to ensure the quality while preventing the yarns from contacting each other when winding the elastic yarn, and further to prevent the yarn breakage and the twisting during winding as much as possible, and to have an excellent unwinding property. It is to provide a method of winding an elastic yarn.

[0010]

That is, the present invention relates to a yarn layer in which the winding width gradually increases from the outermost layer to the inner layer and a yarn layer wound on the inner layer side with a constant winding width and a constant winding angle. In winding an elastic yarn wound body consisting of, the winding of the elastic yarn is controlled so that the winding tension is satisfied at the same time with the following changes in the winding winding angle. It is a taking method.

7.7 × 10 ⁻⁴ θ−0.003 ≦ σ ≦ 0.017 (1) θ ≧ 5 ° (2) where σ is the winding tension [g / d] θ is the winding Twill angle

In the elastic wound yarn body according to the present invention, it is preferable that the yarn layer in the outer layer portion has an absolute thickness of 5 mm or more, and the outermost layer twist angle-the innermost layer twist angle ≧ 4 °.

As the elastic yarn, polyester-based, polyurethane-based, polyamide-based, polycarbonate-based elastic yarns, mixed or composite elastic yarns thereof, and mixed-system elastics mainly containing the above-mentioned elastic polymer are used. It is adaptable to the winding of yarn.

A description will be given below with reference to the drawings. FIG. 2 is a plan view of a cylindrical elastic thread wound body according to the present invention for explaining the winding method of the present invention.

The wound body 6 shown in the figure comprises a yarn layer B having a gradually increasing winding width from the outermost layer to an inner layer, and a yarn layer A wound with a constant winding width and a constant winding angle. ..

In the yarn layer B, in order to gradually reduce the winding width from the inner layer to the outermost layer, the winding angle θ is gradually increased to be wound. This is because the contraction of the elastic yarn y during winding is used, and as explained with reference to FIG. 2, the contraction force of the elastic yarn y during winding is shown in the arrow direction as the traverse angle θ is increased. Thus, the component force toward the center of the wound body 6 increases and the winding width decreases. To increase the traverse angle θ, the traverse speed may be gradually increased from the inner layer to the outermost layer, and the winding speed is kept constant during this period.

In this case, the traversal is a problem.
As the spinning speed gradually increases, the balloon formed by the yarn becomes large, and as shown in FIG. 4, the yarns of the adjacent weights come into contact with each other, which causes the yarn breakage and the yarn damage during winding. ..

In order to prevent this, according to the present invention, the winding tension is also changed as the winding angle increases during winding.

As shown in FIG. 3, the yarn balloon is the resultant force F of the force f1 received by the traverse and the winding tension f2.
Therefore, the balloon can be made smaller by increasing the winding tension f2 as f2 '.

However, increasing the winding tension is disadvantageous in terms of occurrence of twisting during winding, crushing of the paper tube due to winding, and retention of yarn quality. It is preferable to wind it.

Therefore, the yarn layer A which occupies most of the winding
In the case of (1), it is possible to solve these problems by winding up with a low tension, increasing the winding angle, that is, increasing the winding tension as the traverse speed increases to balance the tension. Then, the winding tension is selected by the following formula (1).
It has been found that it may be performed within the range of (2) and (2).

7.7 × 10 ⁻⁴ θ−0.003 ≦ σ ≦ 0.017 (1) θ ≧ 5 ° (2) where σ is the winding tension [g / d] θ is the winding Twill angle

The expressions (1) and (2) are determined based on the maximum winding tension that can maintain the elastic performance of the elastic yarn and the winding limit tension data for various traverse angles.

That is, when the winding tension σ exceeds 0.017, the occurrence of misalignment, crushing of the paper tube due to winding, the occurrence of defective yarn quality, and the like are rapidly increased, and the winding tension σ is 7.7 × 10 ^-4. θ−
If it is lower than 0.003, the yarns of the adjacent weights come into contact with each other during winding, causing yarn breakage and damage to the yarn surface, making winding difficult.

An example of the winding tension control method will be described with reference to FIG. 1, but the present invention is not limited to this, and other control methods or means can be used.

In FIG. 1, the spun elastic yarn y is wound around a winder 3 through a godet roller 1 and 2 to form a wound body 6, which is a godet roller 2 and a winder-3.
A tension meter 4 is provided between the two, and when the winding traverse angle starts to change (when the traverse speed of the winder-3 starts to increase), the tension meter 4 detects it. The value sends a signal from the controller 5 to the drive motor of the godetroller 2 (not shown), and controls the speed to control the winding tension so as to satisfy the range of the above formula.
Of course, it goes without saying that any winding control or speed control may be performed until then.

Normally, the yarn is pulled between the godet roller 2 and the wound body (winder-3) so that the surface speed S2 of the godet roller 2 and the surface speed S3 of the wound body 6 are S2 ≤ S3. In this case, if the surface speed S3 of the winding body 6 is kept constant, the winding tension is controlled by controlling the surface speed S2 of the godetroller 2, and any winding tension can be selected. It becomes possible.

The winding tension may be changed continuously or stepwise, but it is continuously changed in association with the winding diameter, winding time and winding angle of the wound body 6. Is more effective.

The cylindrical elastic yarn winding product according to the present invention has a yarn layer B in which the winding width gradually increases from the outermost layer to the inner layer, and a yarn layer wound with a constant winding width and a constant winding angle. The yarn layer B consists of A and A, but the yarn layer B is wound so that the winding width gradually increases toward the inner layer. Therefore, when unwinding, the process of unwinding the yarn from the wound material under a constant tension. At any stage of the unwinding, the yarn layer being unwound will, at the next moment, always have a smaller winding width than the unwound yarn layer, and the yarn will not fall off during unwinding.

In this case, if the difference between the outermost layer winding angle and the innermost layer winding angle is too small, a sufficient change in the winding width cannot be obtained and it is not possible to prevent the yarn from falling off during unwinding. Therefore, it is preferable that the outermost layer twist angle is larger than the innermost layer twist angle by 4 ° or more, and the innermost layer twist angle is 5 because of the necessity of forming a wound yarn in a teeth shape.
It is preferably at least °.

[0031]

EXAMPLES The present invention will be described in more detail below with reference to examples.

Polyester elastomer (fineness 40d)
When starting winding with a winding angle of 12.3 ° in the innermost layer and gradually changing the winding angle from the position of the innermost layer of 10 mm to 17.0 °, the winding tension is 7 × 10 ^-3 g /
When wound at a low tension of d (Comparative Example 1) and similarly at a high tension of 9.5 × 10 ⁻³ g / d (Comparative Example 2), the above formula (1) and According to (2), gradually increase the winding tension from 7 × 10 ^-3 g / d to 9.5 × 10 with respect to the winding time.
Table 1 shows the yarn breakage ratio and the twist deviation ratio during the winding when the winding amount was increased to ^-3 g / d (Example 1).

The winding speed was set to 750 m / min and the wound diameter of the wound body was set to 150 mm.

[0034]

[Table 1]

As a result of the above, the winding method according to the present invention was a very good result with a yarn breakage ratio of 4.9% during winding and a twill deviation ratio of 1.4%.

[0036]

As described above, according to the present invention, when the elastic yarn is wound up, the contact between the yarns is eliminated, and the yarn is prevented from being broken during the winding, the twill slipping paper tube is crushed, etc. The outstanding effect of being able to stably obtain the excellent elastic yarn of is obtained.

[Brief description of drawings]

FIG. 1 is a process explanatory diagram suitable for carrying out the present invention.

FIG. 2 is a plan view of an elastic thread wound body for explaining the winding method according to the present invention.

FIG. 3 is a diagram for explaining the operation of the present invention.

FIG. 4 is a diagram illustrating the operation of a conventional elastic yarn winding method.

[Explanation of symbols]

 2 Godet roller 3 Winder 4 Tension meter 5 Controller 6 Winding body

Claims (2)

[Claims] 1. An elastic thread winding body comprising a thread layer whose winding width gradually increases from the outermost layer to the inner layer and a thread layer wound with a constant winding width and a constant winding angle on the inner layer side. At this time, an elastic yarn winding method is characterized in that the winding tension is controlled so as to simultaneously satisfy the following (1) and (2) with a change in the winding winding angle. 7.7 × 10 ⁻⁴ θ−0.003 ≦ σ ≦ 0.017 (1) θ ≧ 5 ° (2) where σ is winding tension [g / d] θ is winding angle 2. The elastic yarn winding method according to claim 1, wherein the wound yarn satisfies the following A and B. A. The thickness of the outer layer is 5 mm or more. D. Outermost layer angle-Innermost layer angle ≧ 4 °