JP2002212857A - Method for weaving high density fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high density fabric for airbags having less wavy selvedges on both edges while keeping properties required for the fabric for airbags. SOLUTION: This method for weaving a high-density fabric for airbags comprises a warping for a weavers beam using a warper beam wound with yarns under high tension at the both sides in weaving the fabric and then making a weaving with the resultant warping beam.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a woven fabric for an airbag, which is one of safety devices for automobiles, and more particularly, to a fabric having a small ear cling at an ear end while maintaining necessary mechanical properties. It relates to high-density fabrics.

[0002]

2. Description of the Related Art In recent years, the mounting rate of airbags as one of the safety components for automobiles has been rapidly increasing with an increase in occupant safety awareness. Airbags are used during car collisions
The sensor detects the impact and generates high-temperature, high-pressure gas from the inflator, which rapidly deploys the airbag to help protect the occupants.

Conventionally, a base fabric coated with a synthetic rubber such as chloroprene, chlorsulfonated olefin, or silicone has been used as an airbag for heat resistance, air barrier properties (air permeability),
Used for flame retardant purposes.

[0004] However, these coated base fabrics have many disadvantages when used as airbag base fabrics because the weight of the base fabric is increased, the flexibility is reduced, the production cost is increased, and recycling is not possible. Although the above-mentioned problems have been considerably improved in silicone-coated base fabrics still used in some cases, they are still unsatisfactory.

[0005] Therefore, recently, non-coated airbag base fabrics without coating have become mainstream, and various proposals have been made to reduce the weight, to provide good storage properties, and to reduce air permeability. Under these circumstances, coated cloths are required to be coated less uniformly, and non-coated airbag base cloth requires a high-density woven fabric with little ear cling at the ear end to avoid troubles during processing and cutting. Is desired. Japanese Patent Application Laid-Open No. 9-302549 and Japanese Patent Application Laid-Open
Japanese Patent No. 302550 discloses a method for improving ear palling, characterized in that the woven density of the ear end is higher than that of the other main body, and that an additional yarn is driven into the ear end. Absent. Also, Japanese Patent Application Laid-Open No. 2000-64148 discloses a method of using a spun yarn as a ground yarn, but it is not sufficient to use a spun yarn alone.

[0006]

SUMMARY OF THE INVENTION An airbag which can improve ear pallets, which cannot be solved by the above-mentioned conventional methods, and can generate wrinkles in a refining process and defects in winding up and / or can be uniformly coated in a coating process. It is to provide a suitable high-density fabric.

[0007]

Means for solving the above-mentioned problem, namely, a first aspect of the present invention is that, in warper beam warping, an average value of a winding tension at a center portion of a winding width is obtained by:
It is adjusted to a range of 0.07 to 0.15 g / dtex. On the other hand, the average winding tension in the range of 3 to 20 cm from the ends at both ends is 0.01 to 0.01 to the average value of the winding tension in the center.
A method for weaving a high-density fabric, characterized in that the weaving beam is adjusted to a high value of 0.05 / dtx, the weaver beam is warped using the warper beam, and then weaved. The method for weaving a high-density fabric according to claim 1, wherein the average winding tension of the beam is 0.2 to 0.4 g / dtex, and thirdly, the high-density fabric is a high-density fabric for an airbag. 2. A method for weaving a high-density woven fabric according to item 1.

Here, the characteristics of the method for weaving a high-density woven fabric suitable for the airbag of the present invention will be described in detail. The average value of the winding tension at the center of the warper beam during aging is as follows.
Desirably, it is 0.07 to 0.15 g / dtex. If the winding tension of the water beam is 0.07 g / dtex or less, the winding shape is not good, which causes a trouble in the aging of the weaver beam. If the winding tension of the water beam is 0.15 g / dtex or more, it is not good because the weaving beam breaks due to aging of the single yarn due to the tightening. In addition, it is necessary that the winding tension of the beam is 3 to 20 cm from both ends and the winding tension is higher than the center of 0.01 to 0.05 g / dtex during the aging of the warper beam. It is considered that the weft at the both ends of the high-density woven fabric after weaving is loosened, and the warp at both ends is smaller in weaving than at the center, so that the weft is larger. The difference in winding tension is 0.01g
If it is less than / dtex, the ear-palm is not improved, and 0.05 g
If it is larger than / dtex, the generation of fuzz at the end is promoted, which is not good. In addition, the winding tension of the weaver beam is preferably 0.2 to 0.4 g / dtex. If the winding tension is less than 0.2 g / dtex, the aging process is not stable, so that it is not good. Winding exceeding 0.4 g / dtex may cause troubles such as fluffing during weaving. The average hardness of the Weaver beam wound under such warping conditions is a hardness tester (Asker C type: Kobunshi Keiki Co., Ltd.)
Is 70 to 90 ° when measured at 75 ° C, preferably 75 to 8 °.
5 °. When the hardness is less than 70 °, it is difficult to maintain the shape, and when the hardness is more than 90 °, single yarn breakage occurs due to tightening or the like, which is not good because it causes fluff.

It is necessary that the thermoplastic fiber used in the present invention has a boiling water shrinkage of 5 to 15%. If the boiling water shrinkage is less than 5%, a low air permeability cannot be obtained, and if it is more than 15%, the thickness of the woven fabric after shrinkage becomes large, and the compactness is impaired, which is not good. The value of the boiling water shrinkage is 5
It is preferable to use about 15%, but more preferably 8 to 12%. The heat treatment temperature in the present invention is not particularly limited, and the heat treatment is usually carried out at 100 to 200 ° C, preferably at 160 ° C or lower to obtain low air permeability. Processing is heat setter,
Although there is no particular limitation on a boiling water bath or the like, a processing machine capable of vertical and horizontal overfeeding of about 2 to 15% can be used.

[0010] The weaving method is not particularly limited, but in consideration of the uniformity of the physical properties of the base fabric, the plain weave is good.
The loom is not particularly limited, such as an air jet loom, a rapier loom, and a water jet loom.

The thermoplastic fiber constituting the airbag in the present invention is not particularly limited to a material, but is preferably an aliphatic polyamide fiber such as nylon 6, nylon 66, nylon 46, nylon 12, polyethylene terephthalate, or polystyrene. A homopolyester such as butylene terephthalate is used, but is not particularly limited. However, considering the economy and impact resistance, nylon 6
6, nylon 46 and nylon 6 are preferred, and nylon 66 is particularly preferred. In addition, there is no problem even if these synthetic fibers contain or add various additives in order to improve the processability in the raw yarn manufacturing process and the post-processing process.
For example, antioxidants, heat stabilizers, leveling agents, antistatic agents,
Flame retardants and the like.

The total fineness and single yarn fineness of the raw yarns used are preferably 100 to 550 dtex in total fineness and 6 dtex or less in single yarn fineness. More preferably, the total fineness is 200 dtex to 47.
0 dtex and a single yarn fineness of 4.4 dtex or less. That is, if the total fineness is less than 100 dtex, the tensile strength and tear strength at that portion are insufficient, and if it exceeds 550 dtex, the flexibility of the woven fabric is impaired, which is disadvantageous for storage. If the single-fiber fineness exceeds 6 dtex, this also impairs the flexibility of the woven fabric, which is disadvantageous for storage.

The raw yarn is preferably substantially non-twisted or sweet-twisted, more preferably non-twisted. This is because, when attempting to obtain a low-permeability woven fabric using a low single-filament yarn, twisting impairs the spread of the single yarn, making it difficult to reduce the air permeability.

[0014]

Next, the present invention will be described in more detail by way of examples. The physical properties in the examples were measured by the following methods.

Evaluation of fuzz generation: The number of fuzz at the time of processing and inspection was evaluated by the following four grades. ◎: There is almost no fluff ○: A little fluff is seen. Δ: There are fluff. ×: There is considerable fuzz.

Ear evaluation: The processing was evaluated by visual evaluation and evaluated according to the following five levels. ◎: No earlashes ○: A little earlashes. △: Ear pallets are present X: Ear pallets are considerable XX: Ear pallets are very severe

Boiling water shrinkage: JIS L1013 Hot water shrinkage B method 100 ° C

Weaving density: JISL1096 6.6

Examples 1 to 3 and Comparative Examples 1 and 2 Non-twisted 470 dtex / 72f (single yarn fineness 6.5 dte)
x), boiling water shrinkage = 6.5%, no weft 470 dte
Non-coated airbag fabric with x / 72f, boiling water shrinkage = 6.5%, woven in plain weave, shrink-treated in boiling water, dried at 140 ° C and finished with a density of 54 / in and a weft density of 54 / in. In order to obtain, weaving was performed with a Weaver beam warped under the conditions shown in Table 1. Table 1 shows the state of the ears of the airbag fabric and the results of evaluation of the generation of fluff.

[0020]

[Table 1]

Examples 4 to 6 and Comparative Examples 3 to 4 Non-twisted 350 dtex / 72f (single yarn fineness: 4.9 dte)
x) Boiling water shrinkage = 9.0%, weft is untwisted 350d / 72
f, after weaving a boiling water shrinkage rate of 9.0% with plain weave, shrink processing with boiling water, dry set finishing at 130 ° C, density 6
In order to obtain a non-coated airbag woven fabric having 2 lines / in and a weft density of 62 lines / in, weaving was performed under the conditions shown in Table 2. Table 2 shows the condition of the ears of the airbag fabric and the results of evaluation of the generation of fluff.

[0022]

[Table 2]

[0023]

The present invention is a weaving method capable of providing a fabric for a high-density airbag having little ears at both ends while maintaining the characteristics required for a fabric for an airbag.

Claims (3)

[Claims] An average value of a winding tension at a center portion of a winding width in warper beam warping is 0.07 to 0.15 g /.
dtex range, while 3-20 from both ends
The average winding tension in the range of 1 cm is adjusted to be 0.01 to 0.05 / dtx higher than the average value of the winding tension at the central portion, and the winding is performed. The weaver beam is warped using the warper beam, and then weaving is performed. A method for weaving a high-density woven fabric. 2. The method according to claim 1, wherein the average winding tension of the weaver beam is 0.2 to 0.4 g / dtex. 3. The method according to claim 1, wherein the high-density fabric is a high-density fabric for an airbag.