JPH0911832A - Noncoat air bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make an air bag recyclable, holding necessary characteristics as the air bag, by using the same material for cloths forming the air bag and for sewing threads forming stitching parts. SOLUTION: In a noncoat air bag made up of synthetic resin cloth, it is a general principle that the cloth forming the air bag and sewing threads forming the stitching parts are of the same material. An inflator installing hole reinforcing cloth, a vent hole reinforcing cloth, fiber structures for a strap, and the cloth forming the air bag are all of the same material. For the material, nylon N66- or nylon N6-fibers, polyester system fibers, polyphenylene sulfide, etc., are used. The sewing thread forming the stitching part is made up of the same synthetic fibers as those forming the above-mentioned cloths. Accordingly, the air bag becomes recyclable, holding necessary characteristics as the air bag.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airbag for absorbing and protecting an occupant's impact during a vehicle collision, and more particularly to a recyclable non-coated airbag.

[0002]

2. Description of the Related Art In recent years, the practical use of airbags for ensuring the safety of occupants in automobiles has been rapidly increasing. In the event of an automobile collision, the airbag activates a sensor in response to the impact of the collision, generating high-temperature, high-pressure gas, which causes the airbag to inflate instantaneously, It is intended to protect the forehead. Conventionally, a plain woven fabric using nylon 66 or nylon 6 filament yarn of 300 to 1000 denier is used for an airbag, and chloroprene, chlorosulfonated olefin, silicone, etc. are used to improve heat resistance, flame retardancy, and air barrier properties. Although it was made by applying an elastomer resin such as synthetic rubber of the above, cutting the laminated base fabric, and sewing it to the bag body, the process control of the processing is complicated, and there is a problem in terms of resource saving, that is, recycling. there were.

On the other hand, an inexpensive non-coated airbag, which does not require a coating, is emerging due to the densification of polyamide fiber or polyester fiber woven fabric such as nylon 66 and nylon 6, but there is still a problem in terms of recycling. .

[0004]

In view of the drawbacks of the conventional airbags, an object of the present invention is to provide a non-coated airbag which can be recycled while maintaining necessary characteristics as an airbag. is there.

[0005]

The present invention has the following configuration to achieve the above object. That is, the non-coated airbag of the present invention is characterized in that the fabric forming the airbag and the sewing thread forming the sewing portion are made of the same material.

[0006]

The present invention is based on the fact that, in a non-coated airbag made of synthetic fiber cloth, the cloth forming the airbag and the sewing thread forming the sewing portion are made of the same material, and the necessary characteristics as an airbag are maintained. At the same time, it makes it possible to recycle the airbag, and the present invention cannot be achieved without this.

Examples of the synthetic fiber cloth constituting the non-coated airbag according to the present invention include nylon 6.6, nylon 6, nylon 12, nylon 4.6, and nylon 6.
And nylon 6.6 copolymer, polyamide fiber obtained by copolymerizing nylon with polyalkylene glycol, dicarboxylic acid or amine, homopolyester such as polyethylene terephthalate and polybutylene terephthalate, and repeating unit of polyester. Consisted of polyester fibers obtained by copolymerizing the constituent acid components with an aliphatic dicarboxylic acid such as isophthalic acid, 5-sodium sulfoisophthalic acid or adipic acid, polyphenylene sulfide fibers, rayon fibers, ultra high molecular weight polyethylene fibers, etc. Synthetic fiber cloth is used. In addition, a synthetic fiber cloth composed of a polymer array fiber having a sea-island structure mainly composed of the above-mentioned synthetic fiber is also used. Among these, a synthetic fiber woven fabric composed of nylon 6/6, nylon 6 fibers and polyester fibers is particularly preferably used. Such fibers may contain various additives commonly used for improving the productivity or properties in the production and processing steps of the raw yarn. For example, heat stability, antioxidant, light stabilizer, leveling agent, antistatic agent,
It may contain a plasticizer, a thickener, a pigment, a flame retardant, and the like.

The structure of the woven fabric is plain weave, twill weave,
Textiles such as satin weave and their modified weaves and multiaxial weaves are used, and among these, plain weaves are particularly preferable because of their excellent mechanical properties and thinness. The strength of the single fiber constituting the woven fabric is not particularly limited, but is preferably 5 g / denier or more, more preferably 7 g / denier or more.
g / denier or more, and the fineness and total fineness of the single fibers constituting the woven fabric are not particularly limited as long as they satisfy the mechanical properties required as a non-coated airbag, but the single yarn fineness is preferable. Is 0.01 to 10 denier, and the total fineness is 200 to 1500 denier. As a woven fabric, the cover factor is 1800.
The above is preferable from the viewpoint of low air permeability, that is, airtightness. Further, the tear strength is 10 kgf or more, the basis weight is 250 g / m ² or less, the thickness is 0.4 mm or less, and the tensile strength is 180 kgf /
A length of 3 cm or more and a breaking elongation of 15% or more are preferably used in terms of mechanical properties, flexibility and storability required for a non-coated airbag. Here, the cover factor is (D1) ^1/2 × N1 where D1 is the total warp yarn fineness, N1 is the warp yarn density, D2 is the total weft yarn fineness, and N2 is the warp yarn density.
It is represented by + (D2) ^1/2 * N2. As the loom used in the weaving process, a water jet loom, an air jet loom, and a rapier loom are desirable.

The cloth forming the non-coated airbag includes, in addition to the cloth forming the bag itself of the airbag, a reinforcing cloth for reinforcing the inflator attachment port and the vent hole, and the airbag is inflated and expanded. When this is done, a fiber structure for straps for controlling the length of protrusion to the passenger side is also included. Of course, if these fabrics are applied, they must be the same material.

The reinforcing fabric for reinforcing the inflator attachment port and the vent hole port is formed by laminating about 1 to 5 circular fabrics made of the same material as the fabric forming the bag body of the airbag itself by sewing thread. Sutured. Further, the fiber structure for the strap is also made of the same material as the fabric constituting the bag body of the airbag, and a woven fabric made of a single woven fabric, a double woven fabric, or a single woven fabric and a double woven fabric is preferably used, and is sewn with a sewing thread. To be done.

The sewing thread constituting the sewn portion of the present invention is a sewing thread made of the synthetic fiber constituting the above cloth.
Normally, a sewing thread having a total fineness of 200 to 2000 denier is used, but it is not limited. Above all, a sewing thread composed of 420D / 1 × 3 and 1260D / 1 is preferably used. The sewing method is also not particularly limited, but lock stitch or double chain stitch is appropriately used. Here, it is essential that the sewing thread forming the sewn portion is made of the same material as the cloth forming the non-coated airbag, and the recyclable non-coated airbag of the present invention cannot be obtained without the same material.
Generally, the sewing thread is used for sewing the outer peripheral portion of the airbag body, sewing the reinforcing fabric at the inflator attachment port and the vent hole port, and attaching the fiber structure for the strap.

[0012]

Next, the present invention will be described in more detail by way of examples. The low air permeability, storability, inflation and deployment time, and burst pressure of the airbag in the examples were measured by the following methods.

Low air permeability: JIS L1096.6.
It was measured according to the 27.1 A Frajure method. Storability: A 10 cm × 20 cm woven fabric is bent into a tubular shape, and the bulkiness when a load of 15 g is applied is measured. As a standard product, silicone rubber coated product (45 g / m ²
It is shown as a relative value when the bulkiness of the coated product is 100.

Inflation / expansion time: The inflation / expansion time of an airbag bag having a capacity of 60 L was measured using an airbag dynamic burst tester.

Burst pressure: Using an airbag dynamic burst tester, the burst pressure of a 60 L capacity airbag bag was measured.

Example 1 Total fineness 420 denier, 72 filaments, strength 9.7
Using a nylon 6.6 fiber filament yarn having a g / denier of 24% and an elongation of 24%, a plain woven fabric having both warp and weft of 54 yarns / inch was woven with a water jet loom. Then, the woven fabric is scoured and dried by a usual method, and then 180 ° C.
And heat set for 30 seconds to obtain a non-coated fabric for an airbag. Two circular fabrics having a diameter of 725 mm are cut from the fabric for an airbag, and three circular reinforcing fabrics having a diameter of 200 mm and made of the same fabric are laminated at the center of one circular fabric to have a diameter of 110 mm and 145 mm. The upper and lower threads on the 175 mm line are sewn by a lock stitch with a sewing thread composed of 420D / 1 × 3 of nylon 6.6 fiber, and the diameter is 90 m.
m holes were provided to serve as inflator attachment ports. Further, one circular reinforcing cloth made of the same cloth, having a diameter of 75 mm, is applied contradictory to the position of 255 mm in the bias direction from the center, and a line of 50 mm in diameter and 60 mm in diameter is used for both upper and lower yarns of nylon 6.6 fiber 420D / 1 × 3. A sewing machine stitched by a lock stitch was sewn with a sewing thread composed of, and two vent holes provided with holes having a diameter of 40 mm were installed. Next, the reinforcing cloth side of this circular cloth is placed outside, and the circular cloth is overlapped with the other circular cloth by shifting the warp axis by 45 degrees, and the upper and lower threads are 1260D / of nylon 6.6 fiber on the circumference of 700 mm and 710 mm in diameter. After the sewing machine sewing with the sewing thread composed of 1 was performed by double chain stitching, the bag body was turned inside out to produce a non-coated airbag having a capacity of 60 L.

The characteristics of the thus obtained non-coated airbag were evaluated and are shown in Table 1. The non-coated airbag of the present invention has low air permeability required as an airbag,
It had storability and expansion characteristics, was recyclable, and was favorable in terms of resource saving.

Comparative Examples 1 to 4 A non-coated airbag constructed in the same manner as in Example 1 except that it is sewn with a sewing thread made of polyester fiber is used as Comparative Example 1, and circular reinforcing cloths for the inflator mounting port and the vent hole are provided. A non-coated airbag constructed in the same manner as in Example 1 except that a fabric made of polyester fiber [Comparative Example 2], a fabric made of nylon 6 fiber [Comparative Example 3] and a silicone rubber coated fabric [Comparative Example 4] are used as The characteristics were evaluated in the same manner as in Example 1 and shown in Table 1. The non-coated airbags of Comparative Example 1, Comparative Example 2, Comparative Example 3 and Comparative Example 4 had no particular problems in low air permeability, storability and inflatable expansion characteristics, but were not recyclable and were resource saving. There was a problem.

Example 2 Total fineness 420 denier, 72 filaments, strength 8.5
Using a filament yarn of nylon 6 fiber with g / denier and elongation of 25%, the warp and weft are both 53 by a rapier loom
Books / inch plain weave was woven. Next, the woven fabric was scoured and dried by a usual method, and then heat set at 180 ° C. for 30 seconds to obtain a non-coated airbag fabric. Two circular fabrics having a diameter of 725 mm were cut from the airbag fabric, and three circular reinforcing fabrics of the same fabric having a diameter of 200 mm were laminated on the center surface of one circular fabric to have a diameter of 110.
mm, 145 mm, and 175 mm lines were sewn by sewing with a sewing thread composed of 420D / 1 × 3 of nylon 6 fiber for both upper and lower threads, and a hole having a diameter of 90 mm was provided as an inflator attachment port. Further, one circular reinforcing cloth made of the same cloth, having a diameter of 75 mm, is applied at a distance of 255 mm in the bias direction from the center portion, and the diameter is 50 mm.
420D of nylon 6 fiber for both upper and lower threads on a 60 mm line
A sewing machine composed of 1 × 3 thread was sewn by a lock stitch, and two vent holes provided with a hole having a diameter of 40 mm were provided. Next, the reinforcing cloth side of this circular cloth is placed outside, and the circular cloth is overlapped with the circular cloth by shifting the warp axis by 45 degrees, and the upper and lower threads are placed on the circumference of 700 mm and 710 mm from nylon 6 fiber 1260D / 1. After the sewing machine sewn by the double chain stitch with the constructed sewing thread, the bag body was turned over to produce a non-coated airbag having a capacity of 60 L.

The properties of the thus obtained non-coated airbag were evaluated in the same manner as in Example 1 and shown in Table 1.
The non-coated airbag of the present invention has low air permeability, storability, and inflatable deployment characteristics required as an airbag, is easy to recycle, and is preferable in terms of resource saving.

Comparative Example 5 Total fineness 420 denier, 72 filaments, strength 8.5
Using a filament yarn of nylon 6 fiber with g / denier and elongation of 25%, the warp and weft are both 53 by a rapier loom
Books / inch plain weave was woven. Next, the woven fabric was scoured and dried by a usual method, and then heat set at 180 ° C. for 30 seconds. Thereafter, the woven fabric was coated with a silicone coater using a comma coater so that the coating amount was 45 g / m ² , and vulcanized at 180 ° C. for 3 minutes to obtain a fabric for a silicone rubber airbag. Two circular fabrics having a diameter of 725 mm were cut from the airbag fabric, and one circular fabric had a diameter of 2 with the same fabric in the center of the rubber coated surface.
3 layers of circular reinforcing fabric of 00mm are laminated, and the diameter is 110m.
m, 145 mm, and 175 mm lines were sewn by a lock stitch using a sewing thread composed of 420D / 1 × 3 of nylon 6 fiber for both upper and lower threads, and a hole having a diameter of 90 mm was provided to serve as an inflator attachment port. Further, one circular reinforcing cloth made of the same cloth having a diameter of 75 mm is applied contradictory to the position of 255 mm in the bias direction from the center portion, and the diameter of 50 mm, 6
On the 0 mm line, the upper and lower threads are 420D / of nylon 6 fiber
The sewing machine was sewn with lock stitches using a sewing thread composed of 1 × 3, and two vent holes having holes with a diameter of 40 mm were provided. Next, the reinforcing cloth side of this circular cloth is placed outside, and the circular cloth is overlapped with the circular cloth by shifting the warp axis by 45 degrees, and the upper and lower threads are placed on the circumference of 700 mm and 710 mm from nylon 6 fiber 1260D / 1. After the sewing machine was sewn by the double chain stitch with the constructed sewing thread, the bag body was turned over so that the coated surface was on the inside, and a non-coated airbag of 60 L capacity was produced.

The properties of the thus obtained non-coated airbag were evaluated in the same manner as in Example 1 and shown in Table 1.
The silicone rubber-coated airbag of Comparative Example 3 had no problem in low air permeability and inflatable expansion characteristics, but could not be recycled and had a problem in resource saving.

Example 3 Total fineness 420 denier, 144 filaments, strength 8.
A plain weave fabric having a warp of 48 yarns / inch and a weft of 62 yarns / inch was woven using a filament yarn of polyester fiber having a denier of 7% and an elongation of 18%. Next, the woven fabric was scoured and dried by a usual method, and then heat set at 180 ° C. for 30 seconds to obtain a non-coated airbag fabric. Diameter 72 from the airbag fabric
Two 5 mm circular fabrics are cut, and three circular reinforcing fabrics of the same fabric having a diameter of 200 mm are laminated on the center surface of one circular fabric to form 110 mm, 145 mm, 175 mm diameters.
420D / 1 of polyester fiber for both upper and lower threads on mm line
Sewing with a lock stitch using a sewing thread composed of × 3,
A hole having a diameter of 90 mm was provided as an inflator attachment port. Further, one circular reinforcing cloth made of the same cloth having a diameter of 75 mm is laid against each other at a position of 255 mm in the bias direction from the center portion, and the upper and lower yarns are made of polyester fiber 420D / 1 × 3 on the line of 50 mm in diameter and 60 mm in diameter. The sewing machine sewn by the lock stitch with the sewing thread, and two vent holes having holes with a diameter of 40 mm were installed. On the other hand, total fineness 840 denier, 144 filaments, strength 8.7 g /
Using a denier polyester fiber having an elongation of 18%, a double-woven woven fabric having 25 warps and 25 wefts per inch was woven and cut into a width of 100 mm and a length of 22 mm to prepare two pieces for a strap. Then, with the reinforcing cloth side of the circular cloth facing outside, the circular cloth and the other circular cloth are overlapped with the warp axis shifted by 45 degrees so that the two straps are parallel to each other and the upper and lower threads are polyester fibers. 420D /
Sewing was performed by lock stitching with a sewing thread composed of 1 × 3. Subsequently, after sewing a sewing machine composed of polyester fiber 1260D / 1 on both sides of a circle having a diameter of 700 mm and 710 mm by double chain stitch, the bag body is turned inside out to produce a non-coated airbag having a capacity of 60 L. .

The characteristics of the thus obtained non-coated airbag were evaluated in the same manner as in Example 1 and shown in Table 1.
The non-coated airbag of the present invention has low air permeability, storability, and inflatable deployment characteristics required as an airbag, and is easy to recycle, and thus is preferable in terms of resource saving.

Comparative Examples 6 to 7 A non-coated airbag constructed in the same manner as in Example 3 except that it is sewn with a thread made of nylon 6.6 fiber is Comparative Example 6 and is sewn with a thread made of nylon 6 fiber. A non-coated airbag having the same configuration as in Example 3 except for the above was set as Comparative Example 7.

The characteristics of the thus obtained non-coated airbag were evaluated in the same manner as in Example 1 and shown in Table 1.
The non-airbags of Comparative Example 6 and Comparative Example 7 had no problem in low air permeability and inflatable expansion characteristics, but could not be recycled and had a problem in resource saving.

[0027]

[Table 1] Example 4 Total fineness 400 denier, 100 filaments, strength 5.
Using a filament yarn of polyphenylene sulfide fiber having 5 g / denier and an elongation of 25%, a plain weave fabric having 55 warps / inch and wefts 53 / inch was woven by a water jet loom. Then, the woven fabric was scoured and dried by a usual method, and then heat set at 220 ° C. for 30 seconds to obtain a non-coated airbag fabric. Two circular fabrics having a diameter of 725 mm are cut from the fabric for an airbag, and three circular reinforcing fabrics having a diameter of 200 mm and made of the same fabric are laminated on the center surface of one circular fabric to have a diameter of 110 mm and 145.
mm and 175 mm line, the upper and lower threads are sewn by a lock stitch with a sewing thread composed of 400D / 1 × 3 of polyphenylene sulfide fiber, and a hole with a diameter of 90 mm is provided.
It was used as an inflator mounting port. Further, one circular reinforcing cloth made of the same cloth having a diameter of 75 mm is applied at a position of 255 mm contradictory to the position of 255 mm in the bias direction from the center, and the diameter is 50 m.
The upper and lower yarns of the m and 60 mm were sewn on by sewing with a sewing thread composed of 400D / 1 × 3 of polyphenylene sulfide fiber, and two vent holes provided with holes having a diameter of 40 mm were provided. On the other hand, using the above polyphenylene sulfide fiber, a double-woven fabric having both warps and wefts of 50 yarns / inch was woven and cut into a width of 100 mm and a length of 22 mm to prepare two pieces for a strap.
Next, with the reinforcing cloth side of the circular cloth facing outside, the circular cloth and the warp axis of the circular cloth are overlapped with each other by 45 degrees, so that the two straps are parallel to each other and the upper and lower threads are made of polyphenylene sulfide. A sewing thread composed of 400 D / 1 × 3 of fibers was sewn by a lock stitch. Then, after sewing a sewing machine by double chain stitching on the circumference of diameters of 700 mm and 710 mm with sewing thread composed of 1200 D / 1 of polyphenylene sulfide fiber for both upper and lower threads,
The bag body was turned inside out to produce a non-coated airbag having a capacity of 60 L.

The characteristics of the thus obtained non-coated airbag were evaluated in the same manner as in Example 1 and shown in Table 1. As is clear from Table 1, this air bag is preferable in terms of resource saving because it has low air permeability, storability, and inflatable expansion characteristics required as an air bag and is easy to recycle.

[0029]

According to the present invention, it is possible to provide a non-coated airbag which can be recycled while maintaining the mechanical strength, low air permeability and storability required for an airbag.

Claims (11)

[Claims] 1. A non-coated airbag made of synthetic fiber cloth, characterized in that the cloth constituting the airbag and the sewing thread constituting the sewing portion are made of the same material. 2. An inflator attachment port reinforcing cloth is
The non-coated airbag according to claim 1, which is made of the same material as that of the fabric forming the airbag. 3. The non-coated airbag according to claim 1, wherein the vent hole mouth reinforcing cloth is made of the same material as the cloth forming the airbag. 4. The non-coated airbag according to claim 1, wherein the fiber structure for straps is made of the same material as the fabric constituting the airbag. 5. The non-coated airbag according to claim 1, wherein the inflator attachment port reinforcing fabric, the vent hole port reinforcing fabric and the fabric constituting the airbag are made of the same material. 6. The non-coated airbag according to claim 1, wherein the fabric for reinforcing the inflator attachment port, the fiber structure for a strap, and the fabric constituting the airbag are made of the same material. 7. The non-coated airbag according to claim 1, wherein the fabric for reinforcing the vent hole, the fiber structure for the strap, and the fabric constituting the airbag are made of the same material. 8. The non-coated airbag according to claim 1, wherein the inflator attachment port reinforcing fabric, the vent hole port reinforcing fabric, the strap fiber structure, and the fabric forming the airbag are all made of the same material. . 9. The non-coated airbag according to claim 1, wherein the material is nylon N66 or nylon N6 fiber. 10. The non-coated airbag according to claim 1, wherein the material is a polyester fiber. 11. The non-coated airbag according to claim 1, wherein the material is a polyphenylene sulfide-based fiber.