JPH10236731A - Bobbin-winding body for elastic yarn and winding method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bobbin-winding body for elastic yarn of which the loosening performance is good, the form holding characteristic of the bobbin- winding body is excellent, and the bobbin-winding quantity is large, by setting difference between the maximum value and the minimum value of winding width defined by the space at the same radial positions of two opposed curved surfaces of the bobbin-winding body under a specific value. SOLUTION: Difference between the maximum value δmax and the minimum value δmin of winding width defined by the space at the same radial positions of two opposed curved surfaces of a bobbin-winding body 2 wound on a tube 1 is set under 15% of (δmax +δmin )/2, in particular under 10%. Hereby the leeling tension of leeling elastic yarn can be fixedly held, and the form holding characteristic of the bobbin-winding body for elastic yarn can be improved. Further, when difference between the maximum value δmax and the minimum value δmin exceeds 15% of (δmax +δmin )/2, the leeling performance of the bobbin winding body for elastic yarn can not sufficiently improved, and the form holding characteristic of the bobbin-winding body is also deteriorated, and hence it is not desirable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elastic yarn wound body having a good unwinding performance, excellent shape retention of a wound yarn, a large amount of wound yarn, and a method for efficiently winding the elastic wound yarn. It is about.

[0002]

2. Description of the Related Art Products using elastic yarns are used in many commodity fields that require their elasticity, such as industrial materials, clothing,
It has been used in large quantities in the fields of sanitary materials and clothing miscellaneous goods.

[0003] Many products using elastic yarn are
It is practically used in the form of yarn made of elastic yarn, or in the form of fabric such as woven or knitted fabric. In the manufacture of such products, the required number of elastic yarn wound bodies in which elastic yarn is wound around a tube are prepared. Then, the elastic yarn is sequentially or concurrently pulled out from the wound body using a depolarizing feeder (vertical take-up device) or a positive feeder (rolling-up device) and supplied to the yarn forming area or the cloth forming area. ing.

However, in the conventional elastic yarn winding technique, as disclosed in Japanese Patent Application Laid-Open No. 7-97137, for example, the speed Vt at which the elastic yarn is circumferentially contacted in the width direction of the tube and the elastic yarn are wound around the tube. Using the winding speed Vw in the outer circumferential direction, the distribution state of the twill angle θ expressed by the formula θ = Tan ^-1 (Vt / Vw) is constant, linear, monotonically increasing or monotonically decreasing from the start to the end of winding. Is set to the shape of
Furthermore, as disclosed in Japanese Patent Application Laid-Open No. 7-97137, the hoop angle θ is set to a convex shape having no inflection point.

However, a large-diameter elastic wound body obtained by a conventional winding method, for example, the weight of the wound body is 3.0 kg.
In particular, the elastic wound body exceeding 4.0 kg is shown in FIG.
As shown in the above, the difference δw between the maximum value δmax and the minimum value δmin of the winding width δc defined by the interval at the same radial position of two opposing curved surfaces of the winding body 2 wound on the tube 1 is Since it becomes extremely large, the side surface shape of the wound body becomes a shape similar to a substantially S-shape. This situation is a phenomenon peculiar to the winding of the elastic yarn.

Although the cause of the occurrence of the substantially S-shaped side surface in the above-mentioned elastic yarn wound body has not been clarified yet, according to a long-term study of the present inventors, the elastic yarn is wound around the tube, At the stage where the elastic yarn is taken up and formed into a wound body, the winding tension applied to the elastic yarn is sufficiently large, and the elastic yarn is wound and wound on the tube in a stretched state. After being taken up, so-called tightening of the winding occurs, and the wound yarn body is crushed by the outermost elastic yarn, and the elastic yarn wound on the inner layer is pushed out in the width direction of the wound yarn body, and the above-described winding width δc Is presumed to be caused by the increase in the inner layer portion. It has also been found that the radial position of the wound body where the winding width δc is the largest occurs in the inner layer portion within about 1/3 of the wound thickness of the wound body.

[0007] Therefore, a depolarizing delivery device (vertical removal device) or a positive delivery device (rolling removal device) or the like is used to sequentially or in parallel feed the elastic yarns from the elastic yarn wound body having a substantially S-shaped side surface. When it is attempted to draw out and form a thread or fabric, unwinding of the elastic yarn proceeds. At a stage after the projecting position of the substantially S-shaped lower part of the elastic bobbin, the remaining shape of the elastic bobbin to be unwound has the widest outermost layer and the narrowest innermost layer portion. Since the cross-sectional shape becomes almost inverted trapezoidal, the elastic yarn wound around the outermost layer breaks down from the wound body, and the unraveled elastic yarn and the broken elastic yarn become entangled with each other, resulting in yarn breakage. There was a problem.

[0008] Such a problem is caused by the fact that the elastic yarn is 2
This is particularly problematic in cases where the denier exceeds 00 denier, especially 400 to 1700 deniers, the weight per unit length is large, and it easily falls off from the wound thread.

Further, even when the elastic yarn is drawn out of the elastic wound body and the drawing speed is increased when forming a yarn or a fabric, the drawing operation of the elastic yarn becomes unstable, and the elastic yarn is pulled out of the elastic wound body. There was a problem that the elastic yarn was easily collapsed.

[0010] As described above, when the yarn breaks during unwinding due to the collapse of the elastic yarn, the continuously operating negative feeding device (vertical picking device) or positive feeding device (rolling device) is temporarily stopped. In addition, the entangled elastic yarn must be removed, and the cut elastic yarn must be tied again to the other yarn end hanging on the feeding device, which greatly impairs operability.

Further, when the binding portion is supplied to the yarn forming region or the fabric forming region, the region including the binding portion becomes a defective portion. Defective parts had to be found in the product group and discarded, which reduced production efficiency and was extremely uneconomical.

Incidentally, Japanese Patent Publication No. 5-50429 discloses that
Apparent elongation C of elastic yarn in polyurethane wound body
(%) And the treatment agent adhesion amount (% by weight) of the elastic yarn are 5
≦ C ≦ D + 5 and D ≦ 2, and the amount of winding yarn is 3 kg, with the fineness of the elastic yarn being 280 to 1120 denier.
The above-described elastic wound thread body is disclosed. However, when a yarn or a fabric is formed by using the elastic thread wound body, the amount of the treatment agent attached to the elastic yarn is small, and the elastic yarns are bonded to each other. When the elastic yarn is unwound from the wound body, the frictional force between the elastic yarns causes other elastic yarns wound around the wound body to be drawn out at the same time. There is a problem that the thread breaks easily and yarn breakage easily occurs.

[0013] In addition, the conventional elastic wound thread body is inferior in appearance as a product of the wound thread itself because the winding width is non-uniform and the side face shape of the wound thread is similar to a substantially S-shape. In addition, when the wound body is packed and transported in a case or the like, for example, the position where the width of the wound body becomes the largest is locally in contact with the packing material or another wound body and is rubbed. Therefore, the problem that the elastic yarn is cut or becomes unusable as a product is also included.

[0014]

SUMMARY OF THE INVENTION The present invention has been achieved as a result of studying to solve the problems in the prior art described above.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an elastic yarn wound body having a good unwinding performance and excellent shape retention of a wound yarn, a large amount of wound yarn, and a method of efficiently winding the elastic wound yarn. Is to provide.

[0016]

In order to achieve the above-mentioned object, an elastic yarn wound body of the present invention has a weight of 1.5 times.
The maximum value δ of the winding width δc defined by the interval between two opposing curved surfaces of the elastic wound body exceeding Kg and having the tube length of the wound body exceeding 70 mm.
The difference δw between max and the minimum value δmin is (δmax + δmin)
/ 15% or less.

The weight of the wound body of the elastic wound body of the present invention exceeds 3.0 kg and the tube length of the wound body is 11 kg.
It is particularly preferable to exceed 0 mm, and furthermore, an annular winding having a cross-sectional shape defined by a winding width δc defined by an interval at the same radial position of two opposing curved surfaces of the wound body and a unit thickness of this portion. The winding density of the elastic yarn wound body obtained from the weight of the elastic yarn included in the winding has a substantially S-shaped distribution, and the winding density of the elastic yarn wound body is such that the elastic yarn wraps around the width direction of the tube. Using the contact speed Vt and the speed Vw of winding the elastic yarn in the outer circumferential direction of the tube, the equation θ = Tan ⁻¹ (Vt
/ Vw) with an S-shaped curve distribution similar to or similar to the side surface shape of the elastic yarn wound body obtained by forming the twill angle θ expressed as a constant from the start to the end of winding. Is more preferred.

In the method of winding an elastic yarn wound body according to the present invention, in the method of winding an elastic yarn around a tube to form a wound body, the speed V at which the elastic yarn circumferentially contacts the tube in the width direction may be used.
Using t and the speed Vw at which the elastic yarn is wound in the outer circumferential direction of the tube, the twill angle θ expressed by the formula θ = Tan ⁻¹ (Vt / Vw)
Is changed by giving a substantially S-shaped curve distribution from the start to the end of winding, and the distribution shape of the winding of the helix angle θ from the start to the end changes the helix angle θ from the start to the end of the winding. It is particularly preferable that the elastic yarn wound body obtained by forming the elastic yarn wound up to a constant shape has an S-shaped curve distribution similar to or similar to the side shape of the elastic wound thread body.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an elastic yarn wound body of the present invention and a winding method thereof will be described in detail.

The elastic yarn wound body of the present invention has a winding width δc defined by an interval between two opposing curved surfaces of the wound body at the same radial position.
Are substantially the same, whereby the yarn path of the elastic yarn wound on the wound body when the wound body is unwound is substantially constant. Therefore, the unwinding tension of the unraveled elastic yarn is also constant, and the thickness of the elastic yarn can be prevented from changing due to the unwinding tension. No unevenness due to the change in the color is generated, and a more uniform and high-quality yarn or fabric can be formed.

The elastic yarn used in the present invention is a fiber formed of an elastic organic synthetic resin such as polyester, polyether, polyurethane and polyamide, or a mixture thereof.

The fineness of the elastic yarn is preferably in the range of 400 denier to 1700 denier.

The elastic yarn wound body of the present invention refers to the above-mentioned elastic yarn wound and wound on a tube. Preferably, the weight of the wound yarn exceeds 1.5 kg, and A tube having a tube length of more than 70 mm, more preferably a tube having a wound body weight exceeding 3.0 kg, and a tube having a tube length of more than 110 mm, further preferably a tube having a tube weight of 4.0 kg. Over, the tube length of the wound body is 11
Means a large diameter exceeding 0 mm.

It is also preferable from the viewpoint of continuous operability that the elastic bobbin has a cord portion called a tail at the end of the tube.

Here, an important requirement for the elastic yarn wound body of the present invention is, as shown in FIG. 1, the distance between two opposing curved surfaces of the wound yarn body 2 wound on the tube 1 at the same radial position. The maximum value δmax and the minimum value δmin of the winding width δc defined by
Δw is within 15% of (δmax + δmin) / 2,
In particular, it must be within 10%, and as a result, the winding width δc
Is substantially the same, the unwinding tension of the unwound elastic yarn can be kept constant, and the shape retention of the wound elastic yarn itself can be improved.

The difference δw between the maximum value δmax and the minimum value δmin of the winding width δc is (δmax + δmin) / 2, ie, 15
%, The unwinding performance of the elastic wound body cannot be sufficiently improved, and the shape retention of the wound body is undesirably deteriorated.

As described above, the maximum value δmax of the winding width δc
In order to control the difference δw between the minimum value δmin and
From the weight of the elastic yarn included in the annular wound body having a cross-sectional shape defined by the winding width δc defined by the interval between two opposite curved surfaces of the wound body at the same radial position and the unit thickness of this portion. The required winding density of the elastic bobbin has a substantially S-shaped distribution, or the winding density of the elastic bobbin depends on the speed Vt at which the elastic yarn is circumferentially contacted in the width direction of the tube and the outer periphery of the tube. Using the winding speed Vw in the direction, the equation θ = Tan ⁻¹
An S-shaped curve similar to or similar to the side surface shape of the elastic yarn wound body obtained by forming the twill angle θ expressed by (Vt / Vw) constant from the start to the end of winding, and obtained. This can be achieved by making a distribution.

The winding density in the present invention is defined as a cross-sectional shape defined by a winding width δc defined by an interval between two opposing curved surfaces of the wound body at the same radial position and a unit thickness of this portion. Can be calculated by measuring the weight of the elastic yarn contained in the annular wound body having the above, that is, measuring the yarn density of the annular wound body having a unit width at an arbitrary position on the wound body.

As a method for forming the elastic yarn wound body of the present invention by winding the elastic yarn around the tube, the elastic yarn is wound in the outer circumferential direction of the tube with the speed Vt at which the elastic yarn is circumferentially contacted in the width direction of the tube. Using the velocity Vw, the equation θ = Tan
^-1 (Vt / Vw) is applied by changing the twill angle θ by giving a substantially S-shaped curve distribution from the start to the end of winding, and in this method, the elastic winding body is depolarized. From the viewpoint of work stability and workability when unwinding the elastic yarn from the elastic yarn winding body by the feeding device (vertical picking device) or the positive feeding device (rolling device), the winding of the twill angle θ is started. The distribution shape from the end to the end is an S-shaped curve distribution similar to or similar to the side shape of the elastic yarn wound body obtained by forming the twill angle θ constant from the start to the end of the winding. It is particularly preferred that there is.

In the present invention, changing the helix angle θ by giving a substantially S-shaped curve distribution from the start to the end of winding means that the winding thickness is 0 mm from the position where the winding thickness is 0 mm as shown in FIG. A distribution diagram showing the relationship between the winding angle and the winding thickness until the winding thickness reaches the maximum position of the winding body, or the winding angle and winding from the start of winding to the end of winding. In a distribution diagram showing the relationship of time, it means that the twill angle changes as shown by a curve having one or two inflection points.

In the range where the winding thickness (winding time) is small, the distribution curve of the helix angle has a convex portion, and in the range where the winding thickness (winding time) is large, the distribution curve of the helix angle has a concave portion. Yes, preferably, the projections are in the range of 10 to 40% of the winding thickness (winding time), and the depressions are in the range of 70 to 90% of the winding thickness (winding time). Is the roll thickness (rewind time)
5 to 30%, and the concave portion has a winding thickness (winding time) of 7%.
It is in the range of 5-90%.

In the method for winding an elastic yarn wound body of the present invention, the means for changing the twill angle θ is such that a winding machine for winding the elastic yarn around a tube is repeatedly wound around the elastic yarn in the axial direction. A traverse mechanism is provided to make contact with the traverse mechanism.For example, there is a method in which the speed of the traverse mechanism is increased or decreased according to an increase in the winding diameter of the wound body with a bobbin winder. As a result, it is possible to efficiently manufacture an elastic bobbin having a substantially uniform winding width δc.

From the viewpoint of improving the unwinding property when unwinding the elastic yarn from the elastic yarn winding body, the average value of the twill angle θ in winding is preferably in the range of 10 degrees or more and 20 degrees or less. , And more preferably in the range of 12 degrees to 16 degrees.

The average value of the winding speed Vw is 100
The range is preferably from m / min to 600 m / min, more preferably from 250 m / min to 500 m / min. Furthermore, at the start of the winding of the elastic yarn, the end yarn of the elastic yarn is wound around the elastic yarn, and the required amount is set at one end of the tube for forming the wound body, more than the range in which the elastic yarn is arranged by the traverse mechanism. It is also preferable to apply so-called tail processing to the end of the tube, which has been wound in advance using a dedicated thread gripping mechanism used only at the start of winding.

As described above, according to the present invention, as the winding of the elastic yarn on the tube progresses, the winding density is made similar to the conventional winding width pattern so that the winding of the elastic yarn winding body having a large diameter can be performed. It is characterized in that it is possible to make the width δc substantially uniform, so that it is possible to efficiently obtain an elastic wound body having excellent unwinding performance and excellent shape retention compared to conventional ones. is there.

Therefore, according to the elastic wound body of the present invention, a disposable diaper, an adult urine absorbing member, a women's milk removing member,
Secondary products such as clothing and sanitary materials such as sanitary napkins and clothing materials such as pantyhose, tights and socks can be efficiently produced.

Further, even in a high-speed production in which the speed of pulling out the elastic yarn from the wound body is, for example, 50 m / min or more, the elastic yarn collapses from the wound body to cause yarn breakage or unwinding. There is no change in the thickness of the elastic yarn due to fluctuations in tension,
High quality products can be produced efficiently.

[0038]

EXAMPLE When winding a polyester elastic yarn having a fineness of 560 denier into a tube having a length of 175 mm and a winding amount shown in Table 1, the traverse mechanism shows the distribution of the twill angle θ from the beginning to the end of winding. Was manufactured as described above.

Table 1 also shows the evaluation results of the difference δw in the winding width, the side profile, and the unwinding property of each of the obtained elastic yarn wound bodies.

[0040]

[Table 1] As is clear from the results in Table 1, the elastic wound thread body (Examples 1 and 2) of the present invention in which the traverse mechanism changes the distribution of the twill angle θ from the start to the end of the winding into a substantially S-shape is shown in FIG. Elastic wound body obtained without satisfying the conditions (Comparative Examples 1 to 5)
Compared with 4), the difference δw of the winding width δc is small, and the side profile and the unwinding property are extremely excellent.

[0041]

As described above, the elastic yarn wound body of the present invention has a large winding density because the winding density is similar to the conventional winding width pattern as the winding of the elastic yarn on the tube progresses. Even in the case of a wound thread body, the winding width δc is substantially uniform, and the unwinding performance is very good and the shape retention is excellent as compared with the related art.

Further, according to the method for winding an elastic yarn wound body of the present invention, the above-described excellent winding method can be obtained simply by adding a simple condition of changing the twill angle distribution into a substantially S-shape to the conventional winding method. Thus, an elastic wound body having excellent performance can be obtained efficiently.

[Brief description of the drawings]

FIG. 1 is an explanatory side view showing an example of an elastic wound thread body of the present invention.

FIG. 2 is an explanatory sectional view showing an example of a conventional elastic wound thread body.

FIG. 3 is a schematic view showing an example of a distribution shape of a twill angle θ from the start to the end of winding in the method of winding an elastic yarn wound body of the present invention.

[Explanation of symbols]

 1 tube 2 wound thread

Claims (6)

[Claims] 1. An elastic yarn wound body in which the weight of the wound body exceeds 1.5 kg and the tube length of the wound body exceeds 70 mm, the distance between two opposing curved surfaces of the wound body at the same radial position. The maximum value δmax and the minimum value δ of the winding width δc defined by
The elastic thread wound body is characterized in that the difference δw from the minimum is within 15% of (δmax + δmin) / 2. 2. The elastic yarn wound body according to claim 1, wherein the weight of the wound body exceeds 3.0 kg and the tube length of the wound body exceeds 110 mm. 3. An annular wound body having a cross-sectional shape defined by a winding width δc defined by an interval between two opposing curved surfaces of the wound body at the same radial position and a unit thickness of this portion. 3. The elastic yarn wound body according to claim 1, wherein the winding density of the wound body determined from the weight of the elastic yarn has a substantially S-shaped distribution. 4. The winding density of the elastic bobbin is expressed by the following formula: θ = Tan ⁻¹ , using a speed Vt for circumferentially contacting the elastic yarn in the width direction of the tube and a speed Vw for winding the elastic yarn in the outer peripheral direction of the tube.
An S-shaped curve similar to or similar to the side surface shape of the elastic yarn wound body obtained by forming the twill angle θ expressed by (Vt / Vw) constant from the start to the end of winding, and obtained. The elastic wound thread body according to any one of claims 1 to 3, which is a distribution. 5. A method for forming a wound body by winding an elastic yarn around a tube, using a speed Vt for circumferentially contacting the elastic yarn in the width direction of the tube and a speed Vw for winding the elastic yarn in the outer peripheral direction of the tube. The winding angle of the elastic yarn wound body is changed by giving a substantially S-shaped curve distribution from the start to the end of winding, from the start to the end of winding, the equation: θ = Tan ^-1 (Vt / Vw). How to take. 6. The distribution shape of the twill angle θ from the start to the end of winding is similar to the side shape of the elastic yarn wound body obtained by forming the twill angle θ to be constant from the start to the end of the winding, or The winding method of an elastic bobbin according to claim 5, wherein the distribution is an S-shaped curve distribution equivalent to a similar shape.