JP3114832B2 - High-density woven fabric 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 an airbag (bag) base fabric which is a component of an airbag device used as a seat safety device for ensuring the safety of an occupant from an automobile collision. The present invention relates to a manufacturing method for weaving a high-density woven fabric excellent in low air permeability in a water jet loom. The woven fabric of the present invention can be applied to other uses requiring low air permeability.

[0002]

BACKGROUND OF THE INVENTION It is known that high density fabrics can be obtained using specially designed rapier looms. But,
Rapier looms have the disadvantage that the operating speed is relatively low, 180-350 turns / minute, and the production cost is high in the case of woven fabrics with a large number of driven yarns, such as high-density woven fabrics. In this regard, a water jet loom (hereinafter abbreviated as WJL), which is the same shuttleless loom, can operate at a high speed of 400 to 700 times / min and is suitable for producing high-density fabrics. Such W
The woven fabric woven by JL is characterized by the fact that the wefts protrude from the ground structure and the extra yarns called tufts remain, but these wefts are not continuous with each other, and therefore, when a strong tension is applied in the weft direction. The warp may come off from the yarn end. In order to prevent this thread fraying, 2
Although the reno texture is provided by this yarn, however, the higher the density, the greater the contraction force in the horizontal direction becomes, and the weft tuft ears become the ground of the fabric between the weft insertion and temple gripping. WJ is pulled into the structure and the warp looses, causing WJ
The production of high-density fabrics at L is considered to be difficult. Of course, as a countermeasure, it is conceivable to prevent the warp from coming off by increasing the length of the ear flutes.However, there is a problem in that the quality is poor and the operability of the loom decreases, and there are also problems such as the ear flutes getting caught in the post-processing process. Not a suitable solution.

[0003]

The WJL has a drawback that the warp yarns at the both ears of the woven fabric are apt to be frayed because the woven fabric is formed by cutting the weft yarns one by one on the loom. At the normal fabric density, there was an effect of preventing fraying at the reno tissue ear, but as the density increased, the phenomenon of fraying during weaving occurred and the loom stopped frequently, resulting in frequent drawbacks, making it impossible to weave There are cases. An object of the present invention is to provide a high-quality, highly-productive woven fabric which prevents warp fraying from the ear end during weaving, which is a problem in producing a high-density woven fabric by WJL, and a method for producing the same.

[0004]

Means for Solving the Problems Means for solving the above-mentioned problems, that is, the present invention relates to a woven fabric having a cover factor of 1900 or more made of synthetic fiber, wherein the outermost warp and the ear entangled yarn are A high-density woven fabric and a water jet loom, wherein an ear warp fraying prevention structure is provided by using three or more entangled yarns different from the ear entangled yarn having a finer fineness than the yarn forming the ground structure. Is 1900
When weaving the above woven fabric, between the outermost warp forming the ground structure and the ear entangled yarn forming the ear warp fray prevention structure, the ear entangled yarn having a finer fineness than the yarn forming the ground structure. A method for producing a high-density woven fabric, characterized in that three or more entangled yarns different from the above are supplied at least on the jet nozzle side to form a warp fray prevention structure.

The most characteristic feature of the present invention resides in that a structure excellent in weft gripping is provided between the outermost warp and the ear entanglement yarn (leno structure). Of high-density woven fabric
It can be manufactured stably by JL.

The texture excellent in weft gripping referred to in the present invention refers to a texture in which a yarn is moved to the left and right and twisted to form a Karami texture as in the case of a braid. Since the reno texture is formed only by twisting in one direction like a rope, the effect of preventing the warp from shifting due to lack of weft gripping force is weak.

According to the present invention, since the yarn is moved right and left and crosses each other, the yarn has a tightening effect on the weft and can suppress the deviation of the warp. Further, it is effective that the ear warp fray prevention structure is provided on the weft supply side (jet nozzle side). This is due to the fact that the ear warp frays occur more frequently on the nozzle side and relatively less occur on the opposite side of the nozzle. This is because a yarn end catcher that grips the leading end of the weft is located on the opposite side of the nozzle and functions to prevent the weft from being drawn into the ground structure. The ear warp anti-fraying structure is usually composed of four yarns (two A and two B). Two of them (A) move up and down like the ground tissue. Another two yarns (B) different from these make a motion of crossing the yarn of (A) right and left at every opening. As described above, since the weft is tightened and structured while being rolled, there is no misalignment of the weft, so that the effect of preventing fraying due to the shedding of the warp can be obtained. For this reason, high-density woven fabrics that have been difficult
L made it possible to manufacture.

The synthetic fibers referred to in the present invention include nylon 6, nylon 66, and polyester, but other synthetic fibers are also applicable.

The woven fabric referred to in the present invention is woven by using non-twisted twisted yarns for the warp and the weft. In this case, the warp may be sizing or no sizing, and is not particularly limited. The ground structure is suitable in that the flat structure keeps the ventilation rate low. In addition, the ground structure is also effective in a mat, a twill, a satin structure and a change structure due to dobby.

The high-density woven fabric of the present invention is a woven fabric having a cover factor (K) of the fabric density represented by the following formula of 1900 or more, and in particular, a cover factor (K) of the weft density of 9
Means a woven fabric of 00 or more. CF = √DT × T + √DW × W√DT: Square root of warp denier T: Warp density
イ ン チ DW: Square root of weft denier W: Weft density (book /
Inch) Warp fraying at the time of WJL weaving becomes a problem in a woven fabric with K = 1900 or more. This is because the shrinkage of the weft increases as the cover factor (K) increases, so that the weft tufts are pulled into the ground structure and the warp frays. In particular, WJL has been affected by water, and solving the problem of warp fraying due to this shrinkage has been an important issue. In the present invention, K ≧
Effective for 1900 fabrics. On the other hand, if the fabric texture is loose and no warp fraying occurs, it is not necessary to use the present invention.

In the woven fabric of the present invention, an entangled structure using three or more yarns is formed between the outermost warp yarn and an ear entangled yarn having a conventional reno texture. The reason why three or more entangled yarns are used between the outermost warp and the ear entangled yarn is that the effect of preventing the outermost warp from coming off the weft is large. In this case, even if three or more yarns are used, there is an effect of preventing fraying, but it is preferable to use four yarns, and a case of four yarns will be described below. The feature of the present invention is to configure 4
This is because the book yarn has a function to firmly restrain the weft yarn with its unique twist. The present inventors have conducted various studies and found that this organization is effective in preventing fraying. In the present structure, the binding force between the Karami yarn and the weft constituting the woven fabric is large, so that the ground tissue warp of the ear portion is less likely to be displaced in the ear direction, and a fraying prevention effect is generated.

The entanglement used in the present invention will be described in more detail. This structure is constituted by the following entanglement of four kami yarns. The yarn (A) is entangled up and down with respect to the weft, and is arranged with a yarn (B) that intersects with the right and left every time the weft is driven in. The yarn is entangled like a braid. In addition, it is not always necessary to provide such a structure at both ears of the woven fabric, and the prevention effect can be sufficiently obtained only by providing the structure only on the weft supply side where fraying is a problem. Further, the entanglement organization is not limited by the present embodiment, and can be applied to other organizations.

In order to effectively use the effect of the four-entangled organization, the following points should be considered. (1) The fineness of the yarn used for the entangled yarn is preferably 30 to 200 denier. However, it is necessary to select one with a fine fineness so that the thickness of the portion of the entangled structure is not thicker than the central portion of the woven fabric (called the ground structure). The yarn may be a single yarn or a twisted yarn, and even if the fineness of the four yarns is different, any yarn can be used as long as it has the present effect and does not hinder weaving. (2) As for the entangled yarn, the multifilament has a larger restraining effect than the monofilament. (3) As the characteristics of the entangled yarn, those having characteristics that do not cause problems in the winding, drying, and post-processing steps after weaving may be used. In particular, it is preferable to use a heat-shrinkable material which is similar to a warp having a ground structure. (4) The arrangement of the entangled tissue should be located at the ear where the fraying is likely to occur.

[0014]

The present invention will be described below in detail with reference to examples. Warp preparation was performed under the following conditions. Winding tension during rough winding time: 0.1 to 0.2 g / d Winding speed during rough winding time: 150 m / min Winding thread tension of woven beam: 0.3 to 0.5 g / d Winding speed of woven beam : 100m / min WJL is manufactured by Tsudakoma Kogyo Co., Ltd.
It was 450 rpm. 4 entanglements are trade name BINDER
MAGERD was used. A 100 denier multifilament yarn was used as the yarn used for the four entanglements. 2
The entanglement used a reno texture, and the yarn used was a 50-denier monofilament yarn. The weaving state of the woven fabric obtained under various conditions shown in Table 1 and the quality of the woven fabric including fray of the ear yarn were evaluated. Table 1 shows the evaluation results.

[0015]

[Table 1]

[0016]

As can be seen from the results of the above-mentioned embodiment, the effect of the present invention is remarkable when the cover factor CF of the fabric is 1926 or more, and a high-density fabric having good woven fabric quality without WJL weaving or stopping is obtained. It was confirmed that it could be manufactured. A high-density woven fabric having a cover factor CF of 1900 or more is required to satisfy the low air permeability required for the base fabric used for the airbag without coating, and a low-denier yarn suitable for thinning the fabric is used. It is an effective density to increase the strength of the used fabric. According to the present invention, a high density fabric is
It is possible to manufacture with WJL with good productivity,
In addition, a woven fabric of good woven quality can be obtained.

Claims (2)

(57) [Claims] (1) a synthetic fiber having a cover factor of 19:
00 or more woven fabrics, wherein three or more entangled yarns different from the ear entangled yarns of finer fineness than the yarn forming the ground texture are used between the outermost warp yarn and the ear entangled yarn. A high-density woven fabric having a fray prevention structure. 2. When weaving a woven fabric having a cover factor of 1900 or more with a water jet loom, a ground structure is formed between an outermost warp forming a ground structure and an ear entanglement yarn forming an ear warp preventing structure. A method for producing a high-density woven fabric, comprising feeding at least at the jet nozzle side at least three entangled yarns different from the ear entangled yarns having a finer fineness than the yarns forming the yarn to form a warp fraying prevention structure.