JP2001295155A - Weaving method by air jet loom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for weaving a fabric by air jet loom capable of raising an inner pressure of an air bag made of circular woven fabrics necessary for the air bag and simultaneously obtaining high qualities as the air bag. SOLUTION: In weaving an air bag by an air jet loom having a main nozzle for jetting a weft at one side of the loom and a relay nozzle arranged at a fixed interval in the weft jetting direction, an empty dent through which no warp is passed is made to exist in the reeding width substantially constituting a woven fabric and weaving is carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for weaving an air jet loom, and particularly to a method for weaving a yarn having relatively large fineness, such as a woven fabric for industrial materials, and particularly for weaving a high-density woven fabric. It provides an effective method. Among the industrial fabrics, airbags, which are one of the latest automotive safety devices, are developed in more detail between the occupant and the side window when an impact is applied to the side of the vehicle. The present invention relates to weaving of a woven airbag for protecting a passenger's head.

[0002]

2. Description of the Related Art In recent years, the mounting rate of airbags as one of safety components for automobiles has been rapidly increasing with the increase in occupant safety awareness. In the event of a car crash, airbags
The impact is detected by a sensor, and high-temperature, high-pressure gas is generated from the inflator, and the gas rapidly deploys the airbag to help protect occupants.

Conventionally, airbags for a driver's seat and a passenger's seat that protect an occupant in the event of a collision from almost the front have been installed. Recently, airbags that can cope with a collision from the side have been developed. It has been.

[0004] As a side collision airbag that has already been proposed, as disclosed in WO96 / 26087, a gas generator connected to a sensor that detects a side collision or rollover, and the gas generator are disclosed. The airbag is connected to the airbag, and the airbag is firmly connected on the front and back sides, and is composed of a plurality of elongated cells substantially parallel to each other. Protected.

[0005] By the way, the airbag mainly aimed at protecting the head against the collision from the side, unlike the airbags for the driver's seat and the passenger's seat, when the vehicle rolls over, assumes the internal pressure holding time after deployment. It is necessary to secure several seconds to about 10 seconds, so that the head of the occupant can be protected even when the vehicle rolls over. Therefore, it is important to make the woven density of the woven fabric as dense as possible from the purpose of preventing gas leakage. Further, it is usual that the surface of the bag fabric is coated to increase the airtightness.

When manufacturing an airbag bag for a side collision, in order to have high tear strength and misalignment resistance at a bag joint that can withstand a high internal pressure generated when the airbag is deployed, Pouch fabrics using a Jacquard loom are preferably used.

By the way, when weaving a high-density woven fabric, the warp density becomes large, and in order to perform the high-density weaving, it is necessary to weave the warp under high tension conditions. It becomes large and warp fuzz (filament breakage) easily occurs. In particular, when a bag fabric is manufactured, unlike a normal plain fabric, since the fabric is a double fabric, the warp density in the reed wings is further increased, and the generation of warp fluff is more likely to occur. For this reason, the quality of the fabric is deteriorated, which is not preferable.

[0008] As a method for solving this problem,
For example, as described in Japanese Patent Application Laid-Open No. 57-56546, a relay nozzle is provided with a notch at a position facing a head of an auxiliary (relay) nozzle to cut out a warp yarn. It is said that when cracked, friction occurs between the warp and the wings, which can prevent fluff and yarn breakage. However, in this method, when changing the position of the relay nozzle in the air jet loom as an adjustment for poor weft flight, or when it is necessary to add a relay nozzle when the width of the fabric changes, It is necessary to replace it with a material suitable for the woven fabric, which makes the operation complicated and increases the cost, which is not preferable.

It is also conceivable that the reed portion in front of the relay nozzle is made wider than the other portions to reduce the friction between the warps in the reed portion at that portion. When the position shifts, it is necessary to replace the reed, which is not economically preferable. In addition, it is expected that the generation of warp fuzz will be suppressed by increasing the thickness of the reed wings (reducing the porosity) and positioning the relay nozzle in front of the reed wings. On the other hand, there is no effect because the thickness of the relay nozzle is large.

[0010]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems and, when used as a woven airbag, increases the internal pressure required for the airbag bag and at the same time increases the quality of the airbag. It is an object to provide a weaving method for a woven fabric that can be obtained.

[0011]

The inventors of the present invention have studied the sharpness of the reeds and found that among the reeds of the loom, of the reeds within the reed width, a space for cutting the weft in the warp direction (for example, In particular, when weaving the warp at the center cut, weaving the part where the warp does not pass through the reed, out of all the reeds of the part that actually becomes a fabric, except for the weft-only part) It has been found that when the warp density and the reed density expressed by the following formulas satisfy the following formula, the effect of solving the above problem is enhanced. Means for solving the above problems, namely,
The first aspect of the present invention is that when weaving in an air jet loom having a main nozzle that injects weft onto one of the looms and a relay nozzle that is provided at a constant interval in the weft injecting direction, a reed that actually constitutes a fabric A method of weaving an air jet loom, characterized in that weaving is performed in the width of a blank where no warp passes, and the second is a warp density, a warp density, and a reed represented by the following formula. The weaving method for an air jet loom according to claim 1, wherein the relationship between the number of wings satisfies the following mathematical formula: W = [(deflection) warp fineness (dtex)] ^1/2 × warp density (book / 2) .54 cm) R = number of reeds / 2.54 cm, W ≧ 2000 and 30 ≦ W / R ≦ 150

Third, the ratio of the number of empty wings is 0. 0% of the total number of reeds within the reed width actually constituting the fabric.
The method for weaving an air jet loom according to claim 1, which is 5 to 5%, and a fourth method for weaving the air jet loom according to claim 1, wherein the woven fabric is a woven fabric for industrial materials. Fifth, the method according to claim 1, wherein the woven fabric is a woven fabric for an airbag.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in detail. Among the reeds within the reed width of a warp, a space for cutting a weft in a warp direction (for example, a warp is cut at a center cut portion). Dare to pull out, weft only part)
Of all the reeds that are actually woven fabrics, except for the part that is empty, and the relationship between warp density and reed density (W
It has been found that the present invention is effective when (/ R) satisfies the following expression. That is, W = [(breaking) warp fineness (dtex)] ^1/2 × warp density (book / 2.54 cm) R = number of birds / 2.54 cm, W ≧ 2000 and 3
0 ≦ W / R ≦ 150 Here, the meaning of W indicates the degree of filling of the warp yarn in the reed, and if it is not more than 2,000, gas leakage from the fabric at the time of deployment of the airbag temporarily creates a surface coating. However, this is inconvenient in terms of maintaining the internal pressure of the bag. Also, as for W / R, when this value is less than 30, the reed density is too high, and the warp is liable to be rubbed with the reed, and when it exceeds 150, the reed is in the reed. The warp yarns become entangled or twisted, and the handling of the warp yarns deteriorates, and poor weft flight causes a problem in weaving.

In particular, it has been found that setting the reed wings at the portion where the relay nozzle is located to be empty and setting the ratio of the number to 0.5 to 5% is useful for preventing noticeable warp fluffing. Here, if it is less than 0.5%, the contact of the relay nozzle with the warp cannot be prevented, and there is no effect of suppressing the generation of fluff. On the other hand, if it is larger than 5%, the number of empty wings becomes too large, and when woven into a fabric, the empty wings become streaks, which causes problems in appearance and physical properties of the base fabric (for example, air permeability).

The synthetic fiber constituting the airbag bag of the present invention is not particularly limited to a material, but is preferably made of aliphatic polyamide fiber such as nylon 66, nylon 6, nylon 46, nylon 12, or aramid fiber. Such aromatic polyamide fibers and homopolyesters such as polyethylene terephthalate and polybutylene terephthalate are used. Other examples include wholly aromatic polyesters, ultrahigh molecular weight polyethylene fibers, PPS fibers, and polyetherketone fibers. However, in consideration of economy, polyester fibers and polyamide fibers (nylon 66, nylon 46, nylon 6) are particularly preferable. In addition, there is no problem even if these synthetic fibers contain various additives in order to improve the processability in the yarn production process and the post-processing process. For example, antioxidants, heat stabilizers, leveling agents, antistatic agents, thickeners, flame retardants and the like.

[0016] The fineness of the untwisted yarn forming the fabric is not particularly limited.
It is desirable to be from dtex to 700 dtex. 1
When it is less than 00 dtex, the fabric strength is not satisfied, and when it is more than 700 dtex, the fabric becomes rigid, and there is a problem in the storability. In addition, the single yarn fineness is preferably 7 dtex or less from the viewpoint of the stiffness of the woven fabric, and more preferably 4.
It is 4 dtex or less.

The fabric structure is not particularly limited, but in the case of a bag fabric, the bag portion (double portion) is preferably a plain weave from the viewpoint of low air permeability and tear strength, and the single portion is a weave. The woven structure (for example, basket weave, twill weave, etc.) that does not hinder the weaving is preferably used from the viewpoint of weaving.

[0018]

【Example】

(Example 1) 350 of nylon 66 was used as a yarn.
Using a dtex / 108f filament yarn, the reed density (R) in an air jet loom with electronic jacquard
Using a reed of 23.8 birds / 2.54 cm, 5 warps / flock, and the density of greige is 61/53 (books /
The bag fabric was woven to a weave density of 2.54 cm (bag portion). At this time, when one reed wing in the portion where the relay nozzle is located is made to be one empty wing, the number of empty wings accounts for 1.2% of the total number of reeds within the reed width, which actually constitutes the fabric. is what happened. At that time, W = 2340, W / R = 9
8.3. Thereafter, the fabric surface was coated with silicone. Table 1 shows the weaving properties, base fabric properties, quality, and the like at that time.

(Example 2) 470 of nylon 66 was used as a yarn.
Using a dtex / 72f filament yarn, a reed with a reed density (R) of 21.0 birds / 2.54 cm in an air jet loom equipped with an electronic jacquard, and a warp weaving machine with 5 warps / flock Density is longitude / weft = 108/94 (book / 2.
54 cm). At this time, when the number of reeds in the portion where the relay nozzle is located is made two, the number of empty reeds accounts for 2.7% of the total number of reeds within the reed width actually constituting the fabric. is what happened. At that time,
W = 2400 and W / R = 1114. Table 1 shows the weaving properties, base fabric properties, quality, and the like at that time.

(Comparative Example 1) 350 of nylon 66 was used as a yarn.
Using a dtex / 108f filament yarn in an air jet loom with electronic jacquard, the reed density (R)
Used a reed of 119.0 feathers / 2.54 cm, and used one warp / feather, and the density of greige was 61/53 in the bag part.
The bag fabric was woven to a weave density of (book / 2.54 cm · bag portion). At this time, when the reed wings in the portion where the relay nozzle is located are made one empty wing, the number of empty wings accounts for 0.2% of the total number of reeds within the reed width actually constituting the fabric. is what happened. At that time, W = 2347, W / R = 1
9.7. Thereafter, the fabric surface was coated with silicone. Table 1 shows the weaving properties, base fabric properties, quality, and the like at that time.

Comparative Example 2 350 of nylon 66 was used as the yarn.
Using a dtex / 108f filament yarn in an air jet loom with electronic jacquard, the reed density (R)
Uses 19.6 birds / 2.54 cm reed and 5 warps /
The bag fabric was woven by feathering so that the density of the greige was 50/50 (books / 2.54 cm / bag portion) at the bag portion. At this time, when one reed wing in the portion where the relay nozzle is located is made into one empty wing, the number of empty wings accounts for 1.4% of the total number of reeds within the reed width, which actually constitutes the fabric. is what happened. At that time, W = 1910, W / R = 97.4
Met. Thereafter, the fabric surface was coated with silicone. Table 1 shows the weaving properties, base fabric properties, quality, and the like at that time.

Comparative Example 3 Nylon 66 of 350
Using a dtex / 108f filament yarn, the reed density (R) in an air jet loom with electronic jacquard
Using a reed of 23.8 birds / 2.54 cm, 5 warps / flock, and the density of greige is 61/53 (books /
The bag fabric was woven to a weave density of 2.54 cm (bag portion). At this time, when the number of reeds in the portion where the relay nozzle is located is made five, the number of empty reeds accounts for 5.8% of the total number of reeds in the reed width, which actually constitutes the fabric. is what happened. At that time, W = 2340, W / R = 9
8.3. Thereafter, the fabric surface was coated with silicone. Table 1 shows the weaving properties, base fabric properties, quality, and the like at that time.

[0024]

[Table 1]

As shown in Table 1 above, in Example 1, there is no need for an airbag as a safety component which is free of gas leakage when the airbag is deployed, has no warp fuzz or warp while maintaining the performance of the airbag. I was able to fully satisfy the required quality. Further, in Example 2, a single-layer woven fabric for industrial materials excellent in quality without generation of warp fluff or warp was able to be obtained. On the other hand, in Comparative Example 1, the quality was deteriorated due to frequent occurrence of fluff, and in Comparative Example 2, gas leakage during deployment of the airbag due to insufficient W occurred from the woven fabric, and the performance was not satisfactory. In Comparative Example 3, a streak caused by excessively creating air wings, and gas leakage from the portion occurred, which was not preferable.

[0026]

According to the present invention, it is possible to obtain the required internal pressure retention and high quality required for a woven airbag bag.

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Claims (5)

[Claims] When weaving is performed in an air jet loom having a main nozzle for injecting a weft yarn on one side of a weaving machine and a relay nozzle provided at a constant interval in a weft injection direction, the width of the reed passing actually constituting the fabric is determined. And weaving in the presence of empty wings through which no warp passes. 2. The air jet loom weaving method according to claim 1, wherein the relationship among the warp density, the warp density, and the number of reeds expressed by the following equation satisfies the following equation. W = [(Rebound) warp fineness (dtex)] ^1/2 × warp density (book / 2.54 cm) R = number of reeds / 2.54 cm W ≧ 2000 and 30 ≦ W / R ≤150 3. The air jet loom according to claim 1, wherein the ratio of the number of empty blades is 0.5 to 5% of the total number of reeds within the reed width actually constituting the fabric. Weaving method. 4. The method according to claim 1, wherein the woven fabric is a woven fabric for industrial materials. 5. The method for weaving an air jet loom according to claim 1, wherein the fabric is a fabric for an air bag.