JP2561879B2 - Coated elastic yarn and method for producing the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coated elastic yarn having an elastic yarn and a non-elastic fiber yarn covering the elastic yarn, and a method for producing the same.

[0002]

2. Description of the Related Art So-called elastic covering yarns, which are obtained by winding a non-stretchable short fiber spun yarn with an elastic yarn as a core yarn, are known (Japanese Patent Laid-Open Nos. 61-102422 and 61-108).
741, 61-289147, 62-57959.
No. 62-263337, 64-14332, etc.). This type of covering yarn is disclosed in, for example, Japanese Patent Laid-Open No. 62-62.
-57959, elastic yarns are twisted and coated with high-strength non-elastic synthetic fibers, or in the stretched state, as disclosed in JP-A-62-263337. It is manufactured by aligning the unwound elastic fiber and the inelastic short fiber spun yarn, ballooning them, and twisting the other short fiber spun yarn together.

Further, a coated elastic yarn prepared by coating an elastic yarn with a soluble fiber yarn has been proposed (JP-A-1-26003).
No. 0). This thread is mainly used as sewing thread,
The soluble fiber yarn suppresses the expansion of the elastic yarn to some extent and reduces the frictional resistance, which has the advantage of being easy to handle during sewing. Further, by dissolving the soluble fiber thread after sewing, only the elastic thread remains, so that the elasticity of the thread allows the seam allowance to have a desired elasticity.

[0004]

However, since such a coated elastic yarn retains a torque and is imparted with a relatively large stretch force, it is extremely difficult to handle in the knitting process or the sewing process. It was For example, when supplying a coated elastic yarn from a bobbin or the like to a loom or a knitting machine in a knitting or weaving process, the fed elastic yarn is maintained in a tensioned state to prevent untwisting of the coated elastic yarn, and Or, it must be held in a stretched state suitable for sewing. In such maintenance supervision, it is necessary to place the covered elastic yarn under a predetermined tension that is strictly supervised. Therefore, not only a specific equipment for imparting tension is required, but also the tension supervision is complicated. Work and delicate attention of the operator are required.

The present invention has been made in view of the above points, and an object thereof is to provide a coated elastic yarn capable of improving workability or operability in a knitting process or a sewing process, and a manufacturing method thereof. To provide.

[0006]

In order to achieve the above object, the present invention provides a coated elastic yarn having an elastic yarn, which is
Soluble fiber yarn to reduce the elongation of elastic yarn after spinning
A core component of a covering yarn formed by twisting an elastic yarn drawn at a predetermined ratio, and the core component under tension as a roving before spinning.
The core that was spun together in a draft device and stretched under tension
Is formed by coating the components in the rovings, said core
Coating the core component to reduce the elongation of the component
The core component and a coating component of rovings possess was extended under tension
And a coating component for coating the core component.
The elongation of the elastic covering yarn is determined by measuring the elongation of the elastic yarn with the soluble fiber.
Elongation reduced by the yarn and the roving,
The elongation of the coated elastic yarn decreased by the soluble fiber yarn
Provided is a coated elastic yarn, which is characterized in that it is increased by dissolution of the soluble fiber yarn .

The coated elastic yarn thus obtained has a reduced elongation as compared with a conventional coated elastic yarn made by twist-coating a stretched elastic yarn with a soluble fiber yarn. It is extremely easy to handle in the process or sewing process. Further, since the covered elastic yarn is covered with the roving before spinning, the risk of untwisting in the knitting process or the sewing process is extremely small.

The present invention also relates to a method for producing a coated elastic yarn.
Te, by Yomawa soluble fiber yarn to elastic yarn was stretched at a predetermined magnification, the soluble fiber yarn to the elastic yarn Yomawa
A primary step of forming a covering ring yarn, said cover
Spinning to give tension to the spinning yarn and spin the roving
Cover extended under tension to the drafting device for
The ring yarn is fed together with the roving yarn before spinning and the draft
The covering thread together with the roving thread by
Spinning and covering with the roving before spinning
The yarn is covered with the soluble fiber yarn and the roving yarn
The covering yarn reduces the elongation of the flexible yarn and
As a core component and the roving inelastic fiber yarn as a coating component
And a second step of forming the coated elastic yarn described above.

In such a manufacturing method, the above-mentioned covered elastic yarn can be manufactured using a conventional covering machine and spinning machine, which is extremely advantageous in practical use.

In a preferred embodiment of the present invention, a polyurethane fiber yarn is used as the elastic yarn. As the elastic thread, for example, a natural elastic thread such as a thread of natural rubber or synthetic rubber can be used. In a preferred embodiment of the present invention, long-fiber water-soluble vinylon yarn is used as the soluble fiber yarn. As the soluble fiber yarn, polyvinyl alcohol fiber yarn,
Alternatively, it is also possible to use non-elastic fiber yarns that dissolve in high-temperature water, such as polyalkylene glycol copolymerized polyester fiber yarns, or fiber yarns that are hydrolyzed by an alkaline aqueous solution. Further, as the roving, natural cellulose fiber, particularly hemp fiber, is preferably used.

From another point of view, the present invention provides a knitted fabric or a sewing thread using the coated elastic thread having the above-mentioned constitution .

The knitted woven fabric or the sewn product using such a sewing thread has its stretchability suppressed before the dissolution treatment with warm water or the like, and exhibits the desired stretchability after the dissolution treatment.

[0013]

The preferred embodiments of the present invention will be described in detail below. 1 and 2 are schematic configuration diagrams of an apparatus for carrying out the method for producing a covered elastic yarn according to the present invention. FIG. 1 shows a covering device used in a first step, and FIG. Shows the spinning machine used in the second step.

The covering device shown in FIG. 1 is constructed so as to wind up a yarn from an unstretched elastic yarn supply package 1 located at a lower part to a covering ring yarn winding package 2 located at an upper part. Between the two, the spindle 3 around which the soluble fiber yarn is wound is arranged. A first supply roller 4 and a pressing roller 5 are arranged between the supply package 1 and the spindle 3, and the winding package 2
The second supply roller 6 and the pressing roller 7 are arranged between the and the spindle 3.

In the first step, the elastic yarn 8 fed from the supply package 1 by the first supply roller 4 is
As shown by the arrow, it is passed through the hollow part 3a of the spindle 3,
The yarn is passed through this and is fed to the second feeding roller 6. The peripheral speed of the first supply roller 4 is lower than the peripheral speed of the second supply roller 6, and the peripheral speed ratio of both supply rollers 4 and 6 is such that the elastic yarn 8 between these rollers is stretched at a predetermined magnification. Is set to. Above the spindle 3, the soluble fiber yarn 9 pulled out from the spindle 3 is twisted around the elastic yarn 8 to form the covering yarn 10. The covering thread 10 is wound around the winding package 2 via the second supply roller 6.

The covering thread 10 thus wound up.
Uses the elastic yarn 8 as a core component and the soluble fiber yarn 9 as a covering component, and the elastic fiber 8 can be expanded and contracted as a whole by the elastic property of the elastic yarn 8. Moreover, the soluble fiber yarn 9 is twisted to form a single or single layer having torque. An elastic covering thread. Next, the winding package 2 is transferred to the spinning machine shown in FIG. 2, and the covering yarn 10 is subjected to the second step.

The winding package 2 and the roving bobbin 11 are mounted on the spinning machine. The roving yarn 12 drawn out from the roving yarn bobbin 11 is fed to the draft device 20 via the deflection roller 13 and the guide 14. The covering yarn 10 drawn out from the winding package 2 is fed to the draft device 20 through the plurality of deflecting rollers 15. Between the deflection roller 15 and the winding package 2,
A tension applying mechanism 16 (shown by an imaginary line) for imposing a tension on the fed covering thread 10 is provided. Tensioning mechanism 1
6 is configured to impose a predetermined tension on the covering thread 10 directed toward the draft device 20 by applying a yarn supplying resistance to the covering thread 10 fed as indicated by an arrow. As the tension applying mechanism 16, for example, a known tension applying device including a friction plate that comes into contact with the covering thread 10 and a spring unit that presses the friction plate against the covering thread 10 can be preferably used. The tension applying mechanism may be used.

FIG. 3 is a partially enlarged view showing the periphery of the draft device 20 of the spinning machine shown in FIG. Draft device 20
Includes a pair of first rolls 21 located on the upstream side and a pair of second rollers 22 located on the downstream side.
The first and second rollers 21 and 22 are rotated at mutually different predetermined peripheral speeds, and the difference in peripheral speeds causes the first and second rollers 2 and 2 to rotate.
A predetermined tension is applied to the roving 12 between 1 and 22. The pair of endless belts 23, 24 are used for the first and second rollers 21,
It is arranged between 22. The endless belt 23 is wound around the third roller 25 and the guide roller 26. The fourth roller 27 is arranged so as to face the third roller 25 with the roving 12 interposed therebetween, and the endless belt 24 is wound around the fourth roller 27 and the guide roller 28. Endless belt 23,
The inner traveling belts 24 extend in parallel to each other so as to feed the roving 12 in the yarn feeding direction indicated by the arrow while holding the roving 12 therebetween.

The covering yarn 10 is fed to the nip formed by the third and fourth rollers 25 and 27.
A circumferential groove is formed in the central portion of the third roller 25 in the width direction as shown by a broken line, and the covering thread 10 is accommodated in the circumferential groove and is adjacent to the roving 12 together with the roving 12. It is fed toward the two rollers 22. Second roller 22
The covering thread 10 and the roving thread 12 which have passed through are wound on a spindle 17 while being twisted by a traveler (not shown), and a bobbin of a covered elastic thread 18 having the covering thread 10 as a core thread is formed. Thus, the bobbin 17 of the covered elastic yarn 18 is formed, but the covered elastic yarn 18 may be further rewound as a package having a relatively large diameter.

As the elastic thread 8, an elastic synthetic fiber thread such as a polyurethane fiber thread or a polyester elastic fiber thread can be preferably used. As the elastic thread 8, it is also possible to use a natural elastic thread, for example, a thread-shaped material of natural rubber or synthetic rubber used for thread rubber or the like, or rubber fiber. Further, as the soluble fiber yarn 9, a non-elastic fiber yarn that dissolves in high temperature water, such as long-fiber water-soluble vinylon yarn, polyvinyl alcohol fiber yarn, or polyalkylene glycol copolymerized polyester fiber yarn, can be preferably used. It is also possible to use fiber yarns that are hydrolyzed by an alkaline aqueous solution. Further, as the roving 12, it is particularly preferable to use hemp fiber, for example, coarse-rigid ramie, flax, rafu, pineapple fiber, natural cellulose fiber such as cotton, protein fiber such as wool and silk, or
A synthetic fiber such as a short fiber can be preferably used.

In the table below, polyurethane fiber yarns are used as elastic yarns 8
Further, as the soluble fiber yarn 9, the water-soluble vinylon yarn was used, and the hemp yarn before spinning was used as the roving yarn 12, respectively. Shows the count obtained in. In addition, D in the table
Means denier and S means count.

[0022]

[Table 1]

The covering yarn obtained in the first step in each of Examples 1 to 4 was sampled and subjected to an elongation and strength test. The test results are shown in the table below. Each of the examples has a relatively high elongation like the conventional elastic covering yarn, which means that the covering yarn 10 that has undergone the first step still has problems in terms of operability and workability. It means leaving.

[0024]

[Table 2]

The coated elastic yarns obtained in the second step in Examples 1 to 4 were sampled and subjected to elongation and strength tests. The test results are shown in the table below. Also,
As a comparative example, the same table shows the elongation and strength test results of ordinary yarn (spun yarn after spinning).

[0026]

[Table 3]

In each of the examples, the coated elastic yarn was the first one shown in Table 2.
The elongation is considerably lower than that of the covering yarn in the next step, and is about the same as that of hemp yarn. This is the second
This means that the covered elastic yarn 18 formed through the next step has desired operability or workability in the knitting process or the sewing process. The coated elastic yarn of this example is
Low strength. However, the yarn used in the knitting process or the sewing process generally needs to have a minimum strength of 200 gf. Therefore, although the coated elastic yarn has a relatively low strength as compared with ordinary yarn such as hemp yarn, It can be sufficiently used in a weaving process or a sewing process. In addition, such strength can be increased as desired by proper selection of each yarn used as a constituent element of the covered elastic yarn.

The coated elastic yarns of Examples 1 to 4 were coated at about 90 °.
After dissolving treatment with warm water of C to dissolve and remove the water-soluble vinylon yarn constituting the coated elastic yarn, the elongation and strength were measured again. The measurement results are shown in the table below. Further, FIG. 4 is a diagram showing the correlation between the elongation and the strength at each stage of Example 1 described above. In addition, the diagram shows the sampling N in the above table and the following table.
o. It is created based on the value of 1.

[0029]

[Table 4]

As shown in FIG. 4, when compared with the elongation of the covering yarn produced in the first step, the coated elastic yarn which has undergone the second step and before the dissolution treatment has an extremely low elongation. This elongation is about the same as that of ordinary yarn. And
As shown in the above table and FIG. 4, the elongation of the coated elastic yarn after the dissolution treatment is higher than the elongation before the dissolution treatment shown in Table 2. Therefore, when the soluble fiber yarn 9 is dissolved and removed by the dissolution treatment after the knitting or weaving process, the coated elastic yarn 18 can impart desired stretchability to a knitted fabric or the like.
The increase in elongation in Example 1 is lower than that in the other Examples. However, as can be easily understood by those skilled in the art, the ratio of increase in elongation can be improved as desired by changing the combination of denier or count of the yarn in Table 1 above.

As described above, in the above-described embodiment, the soluble fiber yarn 9 is changed to the elastic yarn 8 while the elastic yarn 8 is drawn at a predetermined ratio.
The covering thread 10 is made into a core thread by a first step of twisting the covering thread 10 into a covering thread 10 and a second step of covering the covering thread 10 under tension with the roving 12 before spinning. The coated elastic yarn 18 is manufactured. The coated elastic yarn 18 thus obtained has a considerably lower elongation than the covering yarn 10 obtained in the first step, and is extremely easy to handle in the knitting or sewing process. Further, the covered elastic yarn covered with the roving yarn 12 can avoid untwisting in the knitting process or the sewing process without providing an excessive torque.

[0032]

According to the above-mentioned constitution of the present invention, it is possible to provide a covered elastic yarn capable of improving workability or operability in a knitting process or a sewing process, and a manufacturing method thereof.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an apparatus for carrying out a method for producing a covered elastic yarn according to the present invention, and shows a covering apparatus used in a first step.

FIG. 2 is a schematic configuration diagram showing an apparatus for carrying out the method for producing a coated elastic yarn according to the present invention, showing a spinning machine used in the second step.

FIG. 3 is a partially enlarged view showing the draft device and its surroundings of the spinning machine shown in FIG.

FIG. 4 is a diagram showing a correlation between elongation and strength according to an embodiment of the present invention.

[Explanation of symbols]

 1 Supply Package 2 Winding Package 3 Spindle 4 First Supply Roller 5 Holding Roller 6 Second Supply Roller 7 Holding Roller 8 Elastic Thread 9 Soluble Fiber Thread 10 Covering Thread 11 Coarse Thread Bobbin 12 Coarse Thread 13 Deflection Roller 14 Guide 15 Deflection Roller 16 Tensioning mechanism 17 Bobbin 18 Coated elastic yarn 20 Draft device

Claims (9)

(57) [Claims] 1. A coated elastic yarn having an elastic yarn, a soluble fiber yarn for reducing the elongation of the elastic yarn after spinning.
A core component of a covering yarn made by twisting an elastic yarn drawn at a predetermined ratio with a roving yarn before spinning , together with the core component under tension.
Spinning the core and stretching the core component under tension with the roving.
Formed by coating to reduce the elongation of the core component
It said that the the covering component of the roving covering the core component possess in order to, covering the core component and the core component is stretched under tension
The elongation of the coated elastic yarn composed of the coating component is
The elongation of the elastic yarn is lowered by the soluble fiber yarn and the roving yarn.
It is the elongation that is lowered and is reduced by the soluble fiber yarn.
The elongation of the coated elastic yarn is effective in dissolving the soluble fiber yarn.
A coated elastic yarn characterized in that the elastic yarn is increased . 2. A method for producing a coated elastic yarn, wherein the soluble fiber yarn is twisted around the elastic yarn by twisting the soluble fiber yarn around the elastic yarn stretched at a predetermined ratio .
The first step of forming a covering thread, and applying tension to the covering thread to finely spun the roving thread
Before stretching under tension to the spinning device for spinning
The covering thread is fed together with the roving thread before the spinning,
The covering yarn is converted into the roving yarn by the draft device.
Spinning with the roving before spinning
Ring yarn is coated with the soluble fiber yarn and the roving yarn.
Reduce the elasticity of the elastic yarn, and
The ring yarn is used as the core component and the roving non-elastic fiber yarn is used as
And a second step of forming a coated elastic yarn as a covering component . 3. The coated elastic yarn according to claim 1, wherein the elastic yarn is a polyurethane fiber yarn. 4. The covered elastic yarn according to claim 1, wherein the soluble fiber yarn is a long-fiber water-soluble vinylon yarn. 5. The roving is a natural cellulose fiber, any one of claims 1, 3 and 4.
The coated elastic yarn according to the item. 6. A knitted fabric comprising the coated elastic yarn according to any one of claims 1, 3, 4, and 5. 7. A sewing thread made of the coated elastic thread according to claim 1. Description: 8. The covered elastic yarn according to claim 1, wherein the roving yarn is a hemp fiber. 9. The method for producing a coated elastic yarn according to claim 2, wherein the roving is a hemp fiber.