JPH0525734A - Production of seamless tubular woven fabric - Google Patents

Abstract

PURPOSE:To obtain seamless tubular woven fabric for base cloth of ink ribbon and belt conveyor required to have high uniformity by inserting dummy warp between warps at both selvedge regions having warp density lower than the main fabric and carrying out the weaving operation. CONSTITUTION:Multifilaments of polyester or nylon are used as warps 1 and wefts 2 to weave seamless tubular fabric by hollow weaving. In the above process, the density of warps 1 is adjusted to be coarser at both selvedge regions A, A than at the main fabric region B. A dummy warp 1' made of high-strength stainless steel fiber, aromatic polyamide fiber, etc., is inserted between the coarsely arranged warps 1 of both selvedge regions A, A and is subjected to fold weaving. The dummy warp is fixed at the upstream side and freed at the downstream side to a proper position beyond the cloth fell down to a breast beam. The dummy warp 1' is pulled out of the woven fabric 8 as the weaving progresses to obtain uniform seamless tubular woven fabric free from the warp density difference between the selvedge regions A, A and the main fabric region B.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a seamless tubular woven fabric having a uniform design over the entire circumference.

[0002]

2. Description of the Related Art A woven fabric structure is a layered weave structure, and one of the layered weave structures is a bag weave. Since the woven cloth obtained by bag-weaving has a seamless (seamless) tubular shape in the circumferential direction, it is possible to select the types of warp and weft threads, or slit the obtained tube in the circumferential direction to an appropriate width. It can be used for various purposes such as a base fabric for ink ribbons, a base fabric for conveyor belts, fire hoses, escape sheets, bandages and rotary screen materials.

Since a product made of a seamless tubular woven fabric is seamless, it is significantly superior in quality as compared to a flat woven fabric which is joined at its both ends into a tubular or looped shape. It is also advantageous in terms of manufacturing process.

By the way, as is well known, when a general flat woven fabric is manufactured, a warp is divided into two parts by a heddle, the weft is run to a shed, and the weft is reed. (Osa) hits the fabric end. When wefts are driven using a shuttle, the wefts reciprocate, so tension is applied to the woven fabric in the width direction, and the width of the woven fabric is slightly narrower than the width of the arranged warp yarns. As a result, the warp density of the woven fabric obtained in the both-end side regions is higher than that in the ground region. Therefore, in order to minimize the shrinkage of the woven cloth in the width direction, a temple is arranged immediately after the weft and the width is set. Star temples and ring temples are used as the temples, but when the temples are used, both ears of the woven fabric are damaged. However, since the both ends are finally cut, there is no particular problem in the case of a general flat woven cloth.

On the other hand, when the weft is driven by a shuttleless loom, such an outermost warp is not held, but the ear tissue is not tightened, so that an appropriate ear tissue should be formed. ing. As a result, when the shuttleless loom is used, the texture of the woven cloth obtained at the both end side regions is different from that of the ground region. However, since both ends are finally cut, there is no particular problem in the case of a general flat woven fabric.

However, unlike the case of a general flat woven fabric, when manufacturing a seamless tubular woven fabric by bag-weaving, a shuttleless loom cannot be adopted, and a shuttleless loom is used. However, in the case of bag-weaving, since the full width of the cloth is the product, it is not possible to use a temple that damages both ears during weaving. Therefore, the seamless tubular woven fabric cannot be stretched out, and it is unavoidable that the density of both ears side regions of the woven fabric becomes higher than the density of the ground region.

[0007] Although such a difference in density has almost no effect on usual applications, it is required for a completely homogeneous weaving structure, for example, this seamless tubular woven fabric is melt-fused in a width direction in a narrow width. However, when the ink ribbon for the impact printer is used after the inking, there is a dense tissue at two opposite points of the loop, and the amount of ink carried and the thread at that portion are present. The crimp state of the paper was slightly different from that of the ground portion, which sometimes caused uneven printing density.

As described above, the seamless tubular woven fabric having no seam in the circumferential direction is of higher quality than the tubular woven fabric obtained by joining both ends of a flat woven fabric. The existence of two dense structures on the entire circumference was the only drawback of the seamless tubular woven fabric.

In order to eliminate this drawback, a part of the warp yarns in the both end side regions at the time of weaving is replaced with a water-soluble warp yarn, and at the time of scouring, the water-soluble warp yarn is dissolved and removed to make the density uniform over the entire width. Various proposals have been made. For example, JP-A-59-29187 discloses an ink ribbon, JP-A-54-120774 discloses an endless material, and JP-B-51 discloses a rotary screen.
There is a publication of -20630.

Further, Japanese Patent Application Laid-Open No. 2-
No. 300347 discloses that when a tubular woven fabric is obtained by a bag-weaving method using warp yarns and weft yarns, a high-strength wire is arranged at both ends of the warped warp and weaving is performed so as to include the wire. , A method for producing a seamless tubular woven fabric, characterized in that the wire is removed after weaving. According to this method, even when tension is applied during the reciprocating movement of the weft yarn, the shrinkage in the weft width direction is suppressed by the high-strength wires arranged at both ends of the warped yarn.

[0011]

However, at the time of weaving, a part of the warp yarns in both ear end regions is replaced with a water-soluble warp yarn, and at the time of scouring, the water-soluble warp yarn is dissolved and removed to make the density uniform over the entire width. This method aims to dissolve from a high-density area, so it is not easy to completely remove the water-soluble warp during scouring after weaving, and inevitably undissolved areas tend to remain. If the harsh scouring condition is adopted to eliminate it, there are problems such as damage to the dough itself, shrinkage, deformation, etc., which is difficult to use in reality.

Further, a method of arranging high-strength wires at both ends of the warped warp and weaving so as to enclose the wires, and removing the wires after weaving is carried out by a method of reciprocating a weft in the width direction. The tension applied to the wire is to be prevented by the elasticity of the high-strength wire, but there is a limit that it is not possible to sufficiently prevent the shrinkage in the weaving width direction by arranging only one high-strength wire at each end. However, if a problem occurs in which the high-strength wire is cut, the weaving itself must be stopped immediately.

Under such circumstances, the present invention aims to provide a method for producing a seamless tubular woven fabric having a uniform density design over the entire circumference by improving the weaving method itself. is there.

[0014]

[Means for Solving the Problems] The method for producing a seamless tubular woven fabric according to the present invention comprises the steps of obtaining a tubular woven fabric by means of a bag-weaving method using warp yarns (1) and weft yarns (2). Area (A),
The warp (1) in (A) is warped so that the density of the warp (1) becomes sparser than that of the ground area (B), and the upstream side is fixed and the downstream side is fixed between the sparsely arranged warp (1). It is characterized in that weaving is performed with a high-strength dummy warp (1 ′) freed in between.

The present invention will be described in detail below.

In the present invention, basically, the warp (1)
The method of obtaining a tubular woven fabric by the bag-weaving method using the weft yarn (2) and the weft yarn (2) is used. At that time, the density of the warp yarn (1) in the both-end side regions (A) and (A) is Warp so that it is sparser than B). The width of both ears area (A), (A) is 3-4m respectively
It is about m, and the rest is the ground area (B).

A high-strength dummy warp (1 ') having the upstream side fixed and the downstream side free between the warp yarns (1) sparsely arranged in the two end side regions (A), (A). And then weaving in this state. The length of the dummy warp yarn (1 ') is appropriately set so that the free end (downstream end) of the dummy warp yarn (1') is located at an appropriate position between the cloth slit and the breast beam.

In the above, as the warp (1) and the weft (2), natural fiber, synthetic fiber, semi-synthetic fiber, regenerated fiber,
Threads made of inorganic fibers or carbon fibers are used.
For the purpose of the ink ribbon base fabric, polyester multifilament yarn or nylon multifilament yarn is preferably used as the warp yarn (1) and the weft yarn (2).

As the dummy warp (1 '), filaments having high strength, for example, metal fibers such as stainless steel fibers, ultra-high-stretched polyacetal fibers, aromatic polyamide fibers, ultra-high strength polyethylene fibers, high tenacity A monofilament shape, a multifilament shape or a filament formed by twisting them is used, which is made of polyvinyl alcohol fiber, high strength polyester fiber, carbon fiber, alumina fiber, boron fiber, silicon carbide fiber and the like. The thickness of the dummy warp (1 ′) is preferably set to be approximately the same as the thickness of the warp (1), but may be slightly thicker than the warp (1).

Weaving is carried out by the bag weaving method. What is a blanket?
It is a type of double weave, in which the warp yarn is divided into a front warp yarn and a back warp yarn, and the weft yarns are made to advance in a spiral shape so as to form one ring in two reciprocations, and sequentially formed into a tubular shape. This is a method of obtaining a tubular woven cloth having a front side and a back side joined at the edges in a flat shape.

The seamless tubular woven fabric obtained by the method of the present invention has various uses such as ink ribbon base fabric for impact printing, conveyor belt base fabric, fire hose, escape chute, bandage and rotary screen material. Used for. Among these, the use of the ink ribbon base fabric for impact printing is particularly important, and the use of the conveyor belt base fabric is also important.

[0022]

[Operation] The heddle and reed of the warp (1) and the dummy warp (1 ') are set, the weft (2) is set on the shuttle, and then the warp (1) and the dummy warp (1') by the heddle (3) are set. ) Opening movement, weft insertion movement of the weft thread (2) by the shuttle, and weft movement movement of weft insertion (2) to the weft (7) by the reed (6), the woven cloth (8) is woven. Dummy warp
(1 ') does not proceed because the upstream side is fixed and the downstream side is free, and it is pulled out from the formed woven fabric (8).

At the time of weaving, the weft (2) reciprocates, so tension is applied to the woven fabric (8) in the width direction, and the warp yarns arranged are arranged.
Woven fabric woven compared to the width of (1) and the dummy warp (1 ')
Since the width of (8) becomes a little narrower, the warp density of both ears side regions (A), (A) of the obtained woven fabric (8) becomes higher than that of the ground region (B), but as described above. Since the dummy warp (1 ') is pulled out, the warp density in the areas (A) and (A) on both ears ends is
It is almost the same as (B), and there is no difference in the density of the warp (1) in both areas.

[0024]

EXAMPLES The present invention will be further described with reference to examples. For convenience of explanation, the bag weaving method that has been conventionally adopted or proposed will be described with reference to three comparative examples, and then examples of the present invention will be described.

Comparative Example 1 FIG. 2 is a front view showing a conventional general bag-weaving method, and FIG. 3 is a plan view of a main part thereof.

The conventional bag-weaving method is performed according to FIGS. That is, the warp unwound from the warp (5)
(1) is divided into upper and lower parts by a heddle (3), and a shed (4)
The weft (2) is driven into. The driven weft (2) is
Woven fabric formed by being struck by the reed (6) on the cloth fell (7)
(8) is wound on the cloth winding (10) through the breast beam (9).

Tension is applied to the reciprocating motion of the weft thread (2), and in the bag-weaving method, since it is not possible to provide a temple at the weft end (7) and to perform tense, as shown in FIG. The width of the woven cloth (8) is narrower than the width of the warp threads (1). Since this shrinkage behavior is seen in the both edge regions (A) and (A), the woven fabric (8) has a high warp density in the both edge regions (A) and (A).

Comparative Example 2 FIG. 4 is a plan view of an essential part showing a method of replacing a part of the warp yarns in the both-end side regions with a water-soluble warp yarn in the case of bag-weaving.

In this method, the binaural end regions (A), (A)
In, a part of the warp (1) is replaced with a water-soluble warp (1x).

In this method as well, tension is applied to the reciprocating motion of the weft yarn (2), so as shown in FIG.
The width of the (8) is narrower than the arrangement width of the warp (1), and as a result, the obtained woven fabric (8) has a higher warp density in the both edge regions (A) and (A).

However, if the woven fabric (8) obtained is scoured under strong conditions, the water-soluble warp (1x) is dissolved and removed, so that the warp density in the both end side regions (A), (A) is It is almost the same as the ground area (B), and there is no difference in the density of the warp (1) in both areas.

However, in this method, since it is intended to dissolve from a high density portion, it is not easy to completely remove the water-soluble warp (1x) at the time of scouring after weaving, and undissolved portions tend to remain. There are problems, and if severe scouring conditions are used to completely eliminate undissolved parts, then the dough itself will be damaged, and shrinkage and deformation will occur. In addition, there is a disadvantage that the refining process becomes complicated.

Comparative Example 3 FIG. 5 is a plan view of an essential part showing a method of arranging high-strength wires at both ends of a bag when weaving.

In this method, high-strength wires (1y) are arranged at both ends of the warped warp and weaving is performed so as to include the wires (1y). After weaving, remove this wire (1y).

Although tension is applied to the reciprocating motion of the weft thread (1), shrinkage in the weaving width direction is suppressed by the high-strength wire (1y), and the obtained woven cloth (8) has both edge regions ( A),
The warp density in (A) is close to that in the ground area (B).

This method is intended to prevent the tension applied in the weaving width direction during the reciprocating motion of the weft thread (2) by the elasticity of the high-strength wire (1y). There is a limit that it is not possible to sufficiently prevent shrinkage in the weaving width direction simply by arranging the wire (1y). Further, when a trouble occurs in which the high strength wire (1y) is cut, the weaving itself must be stopped immediately.

Example 1 FIG. 1 is a plan view of an essential part showing a method for producing a seamless tubular woven fabric of the present invention.

In this method, the binaural region (A),
The warp (1) in (A) is warped so that the density of the warp (1) becomes sparser than that of the ground region (B), and the upstream side is fixed and the downstream side is fixed between the sparsely arranged warp (1). The free high-strength dummy warp (1 ') is inserted.

In this method as well, tension is applied to the reciprocating motion of the weft threads (2), so that the width of the woven cloth (8) becomes narrower than the arrangement width of the warp threads (1), and as a result, the woven cloth ( 8) The warp density is high in both edge regions (A), (A) up to a slight distance from the cloth fell (7), but since the dummy warp (1 ') is removed, the dummy warp (1') The warp density in the two edge regions (A) and (A) of the woven fabric (8) after the yarns have been removed is equal to the density in the ground region (B), and there is a difference in the density of the warp (1) in both regions. Disappear.

[0040]

According to the method of the present invention, the woven fabric obtained can be obtained.
The warp density in the two edge regions (A) and (A) during weaving of (8) is almost the same as the density of the ground region (B), and the woven fabric (8) is uniform over the entire circumference.

Then, the binaural region according to the method of the present invention
Since the elimination of the density difference between (A) and (A) with respect to the ground area (B) is based on the weaving method itself, it has no effect on the weaving speed and does not require a special post-treatment step.

Therefore, the present invention largely contributes to the use of the ink ribbon base fabric for impact printing or the conveyor belt base fabric, which requires a high degree of uniformity over the entire circumference, or other uses.

[Brief description of drawings]

FIG. 1 is a plan view of essential parts showing a method for manufacturing a seamless tubular woven fabric of the present invention.

FIG. 2 is a front view showing a conventional general bag weaving method.

FIG. 3 is a plan view of a main part of FIG.

FIG. 4 is a plan view of an essential part showing a method of replacing a part of the warp yarns on both ear end side regions with a water-soluble warp yarn during bag-weaving.

FIG. 5 is a plan view of an essential part showing a method of arranging high-strength wires at both ends during bag-weaving.

[Explanation of symbols]

(1) ... warp, (1 ') ... dummy warp, (2) ... weft, (3) ... heddle, (4) ... shed, (5) ... warp, (6) ... reed, (7) ... Origami, (8)… Woven fabric, (9)… Breast beam, (10)… Wrap, (1x)… Water soluble warp, (1y)… High strength wire, (A)…
Edge region, (B) ... ground region

Claims (2)

[Claims] Claims: 1. To obtain a tubular woven fabric by a bag-weaving method using warp yarns (1) and weft yarns (2), both ear end side regions (A), (A)
The warp (1) in the warp (1) is warped so that the density of the warp (1) is sparser than that of the ground area (B), and
A method for producing a seamless tubular woven fabric, characterized in that weaving is carried out with a high-strength dummy warp (1 ') fixed on the upstream side and free on the downstream side. 2. The method according to claim 1, wherein the seamless tubular woven fabric is a base fabric for an ink ribbon or a base fabric for a conveyor belt.