JP2002166806A - Manufacturing method for air bag, manufacturing apparatus for air bag, and manufacturing method for manufacturing apparatus for air bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method and a manufacturing apparatus for an air bag for side portions with excellent air-tightness. SOLUTION: In the manufacturing method for the air bag, particularly for the air bag for the side portions, two pieces of main base cloth are overlapped with each other and sewn up together to form a bag, while adhesive material is sandwiched between the two pieces of base cloth of a sewn-up portion. In the manufacturing method, a sewing machine needle with lubricated surface is used for sewing up the two pieces of cloth together. Preferably, additive type room temperature setting silicone resin is used as adhesive material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airbag for protecting an occupant, and more particularly to a method for manufacturing an airbag having excellent airtightness, particularly, a side airbag.

[0002]

2. Description of the Related Art In recent years, airbag systems have become widespread as occupant protection safety devices, and the number of mounting parts has been increasing from driver seats to passenger seats, side collision protection, and rear seats.

[0003] In particular, an airbag for protecting an occupant from an impact at the time of a side collision, that is, an airbag for protecting a side collision (hereinafter referred to as a "side airbag") is used as a means for further enhancing the safety for the occupant. Have been.

[0004] However, since the side airbag is deployed in a narrow space between the occupant seat and the vehicle body, it is necessary to protect the occupant with a small-sized and small-sized bag. Unable to absorb energy enough,
In addition, it is indispensable to take care not to cause a problem such as giving an impact to the occupant.

In particular, the side air is deployed along the side window so as to prevent the occupant from hitting the side window or the vicinity thereof by the impact of the side collision, and covers all or a part of the window. The bag, that is, the inflatable curtain, has a high airtightness that prevents gas from leaking from the inside of the bag for more than several seconds after deployment so that the head of the occupant can be protected even if the body rolls over due to a side impact. The bag base fabric is required to be coated with a silicone resin or rubber.

On the other hand, even when the base fabric itself is excellent in airtightness, when the airbag body formed by stitching these base fabric pieces inflates instantaneously, the seam of the stitched portion of the bag body is not closed. The gas leaked due to the internal pressure of the body and it was difficult to maintain the deployed state for several seconds. For this reason, it has been studied to apply a process for ensuring airtightness to the seam of the stitched portion, that is, a sealing process.

As this method, for example, Japanese Patent Laid-Open No. 2-23
Japanese Patent No. 7837 discloses a method in which an uncured and sticky silicone rubber film is interposed between base fabrics at a sewn portion and the adhesive portion is sewn with a sewing thread.

Japanese Patent Application Laid-Open No. 10-129380 discloses that a joint portion of a side airbag is bonded by rubber glue.
A technique has been proposed in which the rubber is formed by vulcanization bonding of rubber, fusion bonding with a thermoplastic polyurethane resin, clamping of unvulcanized rubber, and the like, and the joint is sewn with a sewing thread.

[0009] However, all of these methods sew in a state in which a material having high rigidity after being hardened is sandwiched between base fabrics of a sewn portion, and the sewn portion is sewn at the time of sewing. When these materials adhere to the surface of the sewing needle that moves up and down at high speed and generates heat due to friction, the stickiness of the sewing needle increases, the resistance during vertical movement increases, and the tensile force on the sewing thread also becomes irregular and high Therefore, breakage of the sewing thread and unevenness of the seam tend to occur, and high airtightness cannot always be obtained.

[0010]

SUMMARY OF THE INVENTION The present invention provides a method for obtaining a highly airtight airbag required for a side airbag represented by an inflatable curtain.

[0011]

SUMMARY OF THE INVENTION The present inventor has solved the above-mentioned problems as a result of diligently devising a technique for manufacturing a side airbag, for example, a highly airtight airbag suitable for an inflatable curtain. I was able to.

That is, according to the present invention, (1) one main body base cloth, an adhesive material layer, and another main body base cloth are overlapped to form a superposed portion, and the superposed portions are sewn to form a bag. A method for manufacturing an airbag to be formed, wherein an additional type room-temperature-curable silicone resin is used as the adhesive material layer, and a sewing needle of the sewing machine has a surface provided with lubricity. (2) the method for manufacturing an airbag according to (1), wherein the sewing needle is cooled; and (3) a superposed portion in which one main base fabric, an adhesive material layer and another main base fabric are overlapped. An apparatus for manufacturing an airbag having means for forming a bag by sewing, wherein a sewing needle used for means for forming a bag by sewing the overlapped portion is used for manufacturing an airbag having a surface with lubricity. Device, (4) sewing needle, silicone compound, fluorine compound, (3) a lubricant selected from the group consisting of fatty acids, higher fatty acids, fatty acid esters, fatty acid amides, fatty acid metal salts, higher fatty acid alcohols, and low molecular weight polyolefins. The present invention relates to the method for producing a device, and (5) the method for producing a device according to (4), wherein the lubricant is baked on the surface of the sewing needle.

According to the manufacturing method of the present invention, when a bag body is formed by suturing two main body base fabrics together, an adhesive material is sandwiched between the base fabrics of the sewn seams. This is a method to increase airtightness. By using a sewing machine needle with lubricity on the surface, it is possible to sew easily without being affected by the adhesiveness and other properties of the adhesive material sandwiched between the base cloths. It is a method that can be.

A sewing needle provided with lubricity is essential for quickly and stitching two base cloths sandwiching an adhesive material without impairing sewability, and 1) a smooth surface. Permanent treatment by baking the agent, etc., 2) Applying a smoothing agent to the surface by sewing or spraying at the time of sewing, 3) Provide a smoothing agent tank in a bobbin case and contact it with a sewing machine needle, etc. However, an optimal means may be selected according to the specifications of the suturing portion, and the present invention is not limited to these methods.

In the method according to the present invention, the adhesive material sandwiched between the base fabrics is a material capable of maintaining the adhesive property for a long time according to the surface of the base fabric constituting the airbag body, that is, the surface of the covering material or the surface of the base fabric. It is advisable to use an addition type, or a room temperature-curable silicone resin mainly composed of an addition type having excellent heat resistance.

Some addition-type silicone resins are thermosetting, but thermosetting silicone resins have the advantage of a short curing time, but not only require a heating step, but also require a heating step between the base fabrics. Depending on the amount of silicone resin sandwiched (the applied thickness), small air bubbles mixed at the time of application may expand due to heating, impairing the airtightness of the overlapped portion and the adhesion to the base fabric surface without being removed from the silicone resin layer. Is also conceivable. In general, condensation-type room-temperature-curable silicone resins (one-part) that cure by reacting with moisture in the air are slow to cure when the application amount is large, and the degree of curing is difficult to be uniform. Adhesion with the base fabric tends to be uneven. Further, the heat resistance after curing tends to be lower than that of the addition type silicone resin.

The addition-type room-temperature-curable silicone resin has, for example, a JIS-A hardness after curing of 20 or less, preferably 2 to 15 and a breaking elongation of 800% or more, preferably 1000% to 1500%. By using a highly extensible material, it is possible to obtain a suture portion having low rigidity, extremely softness and high adhesive strength, and a folded volume of the airbag can be reduced.

The adhesive material is applied to the sewn portion by directly applying or pasting the solution or the sheet-like material itself, applying and transferring and pasting the carrier, and applying the solution or sheet material to both sides of the carrier such as a reinforcing cloth. May be applied. In the case of direct application, it may be selected from a method of applying with a trowel, a method of spraying with an air gun, a method of screen application, and the like, but is not limited thereto.

The amount of the adhesive silicone resin to be applied may be selected according to the specifications of the sewn portion.
The thickness may be in the range of 00 to 800 g / m ² (in terms of solid component) or the coating thickness of 0.1 to 1 mm.

Also, the coating width of the adhesive silicone resin is
It may be selected according to the suturing site, the suturing specification, etc., for example, it may be in the range of 10 to 40 mm. This can prevent gas from leaking from the stitched seam due to the close contact between the adhesive and the base cloth.

The addition type room temperature curable silicone resin includes:
Silicone as main agent and its curing component (curing agent, catalyst, etc.)
There is a two-pack type that uses a mixture of the above and a one-pack type that can shorten the curing time. The addition-type room-temperature-curable silicone resin is room-temperature-curable, but unlike the one-pack condensation type, which reacts with moisture in the air, the curing speed can be adjusted by the added and compounded curing agent,
Excellent in curing speed and uniformity compared to condensation type.

The silicone resin used as the adhesive material in the present invention may be any resin that satisfies the required properties such as adhesiveness to the base fabric, heat resistance, and flexibility. As the agent, a compound containing a hydrogen silane group (≡Si—H) and a platinum compound as a curing catalyst may be used, but not limited thereto.

The airbag according to the present invention is sutured with an adhesive silicone sandwiched between two body base fabrics,
Suturing is performed when the adhesive silicone is completely cured (solidified) (dry), in a semi-cured state with reduced tackiness (semi-wet), or in an uncured state where it is hardly cured (wet) However, suturing in a semi-wet or wet state improves the adhesion between the sewn portion, particularly the suture and the adhesive silicone, and eliminates the gap between the joint, particularly the suture and the adhesive silicone. It is preferable because excellent airtightness can be obtained as a whole suturing portion. In other words, in a state where it is not completely cured, the adhesive silicone can self-flow to fill the gap with the sewing thread, so-called “fit into a thread”, or a plurality of airbags are stacked and stored in a manufacturing plant. Thus, the gap can be closed by applying a load, and positively pressing as necessary.

The viscosity of the silicone to be used, the curing time, and the pot life after mixing (pot life) are determined in consideration of the viscosity of the coating solution, the coating operation, the properties after curing, and the like. It may be appropriately selected depending on the molecular weight, the type and amount of the curing agent to be blended, and the like. For example, the viscosity of the silicone resin is 50 to 500 Pa · s, and the curing time is 10 to
30 hours, the pot life may be selected from 2 to 10 hours.

The adhesive silicone resin used in the present invention comprises:
Normally, curing may be performed at room temperature. However, when it is desired to promote curing, such as a site where the amount of application is extremely large, or a large airbag shape, heat treatment in an atmosphere of about 40 to 100 ° C. or high frequency, High energy treatment such as electron beam and ultraviolet ray may be performed.

Further, various additives usually used for improving the coating processability, adhesiveness, surface properties, durability, etc., such as a crosslinking agent, a silane coupling agent, and a reaction accelerator are added to the adhesive silicone. Agents, reaction retarders, heat stabilizers, antioxidants, light stabilizers, anti-aging agents, lubricants,
Even if one or two or more of a smoothing agent, an anti-adhesive agent, a pigment, a water repellent, an oil repellent, a concealing agent such as titanium oxide, a gloss imparting agent, a flame retardant, a plasticizer, etc. are selected and mixed, Good.

In the present invention, two main fabrics are superposed and sewn. However, one fabric may be folded back and superimposed.
In some cases, two superposed base fabrics may be further folded back, or a larger side of the similar base fabric may be superimposed on a smaller side and the larger side perimeter wrapped around the smaller side perimeter. Also, the surfaces to be overlapped are the base fabric surfaces,
Any of the coating material surfaces, the base cloth surface and the coating material surface may be used.

It is preferable to apply a coating material on the surface of the base fabric in order to enhance the airtightness of the base fabric itself. It is not preferable to use a thermosetting silicone resin or rubber from the viewpoint of heat resistance and adhesion to an adhesive material. More preferred. The coating material may be applied to the base fabric as long as it can ensure adhesion to the fabric and airtightness of the coating layer. The coating method (knife, kiss, reverse) and the printing method (screen, roll, rotary) ), A laminating method, a dipping method, a transfer method and the like.

The amount of the coating material to be applied may be selected according to the required airtightness, heat resistance, folding volume and the like.
It may be in the range of 0 to 100 g / m ² (in terms of solid content).

The coating material used in the present invention may be any material to which the above-mentioned processing method can be applied, and examples thereof include silicone-based, fluorine-based, chlorine-based, polyurethane-based (including silicone-modified and fluorine-modified), epoxy-based, Polyester, polyamide, polyimide, chlorsulfone, phenol, acrylic, etc. may be appropriately selected from one or a mixture of two or more, or copolymers, modified products, etc. Silicone-based, fluorine-based, and polyurethane-based (including silicone-modified) are particularly preferred from the viewpoints of improvement in properties, heat resistance, flame resistance, etc., easy workability, affinity with adhesive materials, and the like.

The coating material may contain various additives usually used for improving workability, adhesion, surface properties, durability, etc., such as a crosslinking agent, a reaction accelerator, a reaction retarder, and a heat-resistant material. Stabilizers, antioxidants, light stabilizers, anti-aging agents, lubricants, smoothing agents, anti-adhesives, pigments, water repellents, oil repellents, concealing agents such as titanium oxide, gloss agents, flame retardants, plasticizers , Etc., may be used alone or in combination.

The covering material may be interposed on at least one surface of the woven fabric forming the main base fabric, a gap between the woven fabrics, or a gap between the fiber yarns.

The coating material may be added with various pretreatment agents for improving the adhesion to the base cloth, an adhesion improver, or the like, or may be subjected to a pretreatment such as a primer treatment on the fabric surface in advance. Is also good. Furthermore, in order to impart heat resistance, anti-aging property, oxidation resistance and the like to the elastomer, after applying the elastomer to the fabric, drying, crosslinking, vulcanization, etc. are performed with hot air treatment, contact heat treatment, high energy treatment (high frequency, electronic Rays, UV)
It may be performed by such as.

As described above, the airbag of the present invention has a means for forming one body base fabric, an adhesive material layer, and another body base fabric on top of each other to form a superposed portion in a stitched bag shape. The bag body is formed by suturing using an airbag manufacturing apparatus provided with the sewing machine needle. Any sewing machine needle may be used as long as it has lubricity on its surface. What is necessary is just to select a shape and a number from the description of B9076. For example, among various industrial sewing needles, DA
× 1, DP × 5, DR × 2, etc. 18-25 counts, Delta-U needles with improved needle bending strength, U-shaped cross section of needle stem, and MR formed by bending the edge of needle. A needle or the like may be used.

The lubricant applied to the surface of the sewing machine needle to impart lubricity may be selected from those usually used as smoothness-imparting agents. For example, silicone compounds (including modified products) may be used. , Fluorine compounds, various waxes, higher fatty acids, fatty acid ester compounds, fatty acid amide compounds, fatty acid metal salts, higher fatty acid alcohols, release agents such as low molecular weight polyolefins, smoothing agents, lubricants, etc., and silicone compounds and fluorine compounds are particularly preferable.
These can be used alone or in combination of two or more.

Permanent smoothness can be imparted by baking a fluorine compound or a silicone compound among these smoothness imparting agents to a sewing needle.

At the time of suturing, a silicone compound, various waxes, higher fatty acids and the like are provided in an oil tank in a bobbin case, for example, so as to come into contact with a sewing needle, or sprayed with pressurized air to easily provide smoothness. You can also.

Further, it is preferable to spray a low-temperature gas onto the sewing needle and the base cloth around the sewn portion during suturing to suppress the temperature rise of the sewing needle, in order to make the manufacturing method according to the present invention effective.

In the case where the main fabric is a woven fabric using a thread thinner than 250 dtex, the sewing thread count T and the number of needles S (needle / cm) are set as follows: 20 ≦ T ≦ 80, 2 ≦ T / S
It is preferable to stitch under the condition satisfying the relationship of ≦ 8.

In the present invention, when the sewing thread number is different for the upper thread and the lower thread to be used, it is desirable that each of the thread numbers satisfies the above-mentioned relational expression and the relationship of the expression.
It suffices that at least one of the upper thread and the lower thread satisfies the formula and the relationship of the formula.

The seam specifications according to the present invention may be selected according to the base fabric to be used, the specifications of the bag, the required joining strength, and the like. Lock stitches, double chain stitches, one-sided down stitches, overlock stitches , Safety stitching, zigzag stitching, flat stitching, and the like, and combinations thereof may be used.

The sewing thread used in the present invention may be appropriately selected from those generally called synthetic fiber sewing threads and those used as industrial sewing threads.
There are nylon 66, nylon 46, polyester, vinylon, aramid, carbon, glass, etc.
Either a filament twisted yarn or a filament resin processed yarn may be used.

Further, in order to increase the airtightness of the sewn portion, before or after the suturing, the upper or lower portion of the sewn portion, the seam allowance,
A sealing material, an adhesive, or the like may be applied, pasted, sandwiched, or the like between the sewn portions. In order to cure these sealing materials and adhesives, heating, pressurization, humidification, and the like may be performed, and a high energy source such as high frequency, electromagnetic wave, electron beam, ultraviolet light, and infrared light may be used.

Further, the two base fabrics constituting the airbag body used in the present invention can reduce the folding volume.
The woven fabric may be a thin yarn, for example, a yarn using 400 dtex or less, preferably 235 dtex or less. Also, if the basis weight of the base fabric is 200 g / m ² or less, preferably 150 g / m ² or less, the weight of the airbag can be reduced.

The cover factor (CF) determined from the thickness (decitex) of the yarns constituting the woven fabric and the density of the woven fabric (book / inch) may be 2000 or more, preferably 2000 to 2600.

Here, the fabric cover factor (CF)
Is an index indicating the denseness of the woven fabric structure. The decitex (Dw and Df) of the warp and the weft used in the woven fabric and the warp density and the weft density (Nw and Nf) of the woven fabric (book /
Inches). CF = √Dw × Nw + √Df × Nf

The fiber yarn constituting the woven fabric of the present invention is not particularly limited. For example, nylon 6, nylon 66, nylon 46, nylon 610, nylon 6
12 or the like, or an aliphatic polyamide fiber obtained by copolymerization or mixing thereof, nylon 6T, nylon 9
Polyamide fiber obtained by copolymerization of aliphatic amine and aromatic carboxylic acid represented by T, polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, or the like alone or by copolymerization thereof, Paraphenylene terephthalamide, and aramid fibers represented by copolymers thereof with aromatic ethers, wholly aromatic polyester fibers, vinylon fibers, ultrahigh molecular weight polyethylene fibers, fluorine fibers containing polytetrafluoroethylene, Cellulose fiber including polysulfone fiber, polyphenylene sulfide (PPS) fiber, polyetheretherketone (PEEK) fiber, polyimide (PI) fiber, polyetherimide (PEI) fiber, and high-strength rayon , Acrylic fibers, carbon fibers, glass fibers, silicone carbide (SiC) fibers, may be suitably selected from alumina fibers, etc., as the case may include inorganic fibers such as metal fibers represented by steel.

Various additives usually used for improving the spinnability, processability, and durability of materials are added to these fiber yarns, such as heat stabilizers, antioxidants, light stabilizers, and aging. One or more of an inhibitor, a lubricant, a smoothing agent, a pigment, a water repellent, an oil repellent, a concealing agent such as titanium oxide, a gloss imparting agent, a flame retardant, and a plasticizer may be used. In some cases, processing such as twisting, bulking, crimping, and winding may be performed. Furthermore, the form of the yarn is
There is no particular limitation on filaments of long fibers, spun yarns of short fibers, or composite yarns of these.

The main base fabric used in the present invention may be woven by various looms used for producing ordinary industrial fabrics. For example, a shuttle loom, a water jet loom (WJL), an air jet loom ( AJL), rapier looms, projectile looms and the like.
The weaving organization is plain weave, weft weave (basket weave), twill weave,
Any of a lattice weave (rip-stop weave) and a composite structure thereof may be used.

The airbag according to the present invention is a side airbag for protecting an occupant from a side impact of the vehicle. For example, the inside of the vehicle body (front pillar, roof side rail, center (The pillar, rear pillar, etc.) in a folded state, and the gas blown out from the inflator in the event of a side collision creates a curtain near the side window (space below the front pillar, center pillar or rear pillar in the vehicle cabin below the roof side rail). It is an airbag for side protection to deploy.

The reinforcing cloth that can be used for reinforcing the periphery of the inflator mounting opening of the airbag according to the present invention may be the same cloth as that used for the bag body, but a separately prepared reinforcing cloth such as nylon. 66 created using 940 decitex, 470 decitex, etc.
A single or a plurality of thick fabrics may be used. The reinforcing cloth referred to here includes a flameproof cloth for shielding hot gas ejected from the inflator, and in order to impart heat resistance to the reinforcing cloth, a heat-resistant resin such as a silicone resin, a fluororesin, or a heat-resistant rubber is used. Or a woven fabric using heat-resistant fibers such as aramid fibers.

The airbag according to the present invention is intended for a side airbag for protecting a side collision, and includes, for example, an inflatable curtain. The present invention can also be applied to a small bag that is deployed to protect the abdomen, and the shape, capacity, and the like may satisfy the required requirements.

[0053]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described more specifically based on embodiments. In the examples, the performance evaluation of the airbag was performed by the following method.

(1) Sewability of sewing machine needle An adhesive material is sandwiched between base fabrics of the side airbag shown in Example 1, and after curing, a sewing thread of nylon 66 fiber (both upper thread and lower thread is 8). The state of adhesion of the adhesive material to the sewing needle (DR × 2, 22nd) when the lockstitch (two rows) was sewn with the number of stitches of 4 stitches / cm was observed.

(2) Adhesion The coated surfaces of two base fabrics are overlapped, an adhesive material is sandwiched between the base fabrics, and cured at room temperature for about 30 hours. Then, the composite sheet is cut into a width of 3 cm, and peeled and adhered. The force was measured.

Example 1 A plain woven fabric having a weaving density of 60 yarns / inch and a weft density of 60 yarns / inch was woven using a nylon 66 fiber of 350 dtex / 72f (original yarn strength of 8.5 cN / dtex). ,
After heat setting, a thermosetting silicone resin was applied to one surface of the woven fabric at a rate of 45 g / m ² (in terms of solid content) to obtain a coated woven fabric. The density of the woven fabric after coating was 62 yarns / inch for both weft and weft, and the basis weight of the woven fabric was 195 g / m ² before coating and 240 g / m ² after coating.

Next, two pieces of the coating base cloth were cut into a substantially parallelogram shown in FIG. 1 as the main base cloth of the airbag.
At this time, the length of each side is 160 cm on the upper side and 180 c on the lower side.
m, the left and right hypotenuses were 80 cm and 65 cm, respectively, and the height was about 55 cm. An addition type room temperature curable silicone (manufactured by Dow Corning Toray Silicone Co., Ltd.) was used as an adhesive silicone at the outer peripheral portion of the coating surface of the cutting cloth 1 and at the four portions (4a to 4d in FIG. 1) of the eyebrow. The coating was applied to a thickness of 0.5 mm and a width of 25 mm, and the coated surfaces of the cutting cloth 2 were overlaid on each other, and left at room temperature for about 30 hours to cure the silicone. The "eyebrows" joint is
The height was about 30 cm and the latitude was about 15 cm.

Next, a sewing needle (Singer Nikko Co., Ltd.) baked with a silicone release agent (KS804 manufactured by Shin-Etsu Chemical Co., Ltd.)
The stitched portion was sewn using R × 2, 22th. As shown in Table 1, the adhesive material did not adhere to the sewing needle and the adhesive strength was high.

Example 2 JIS B-6 was used instead of the sewing needle used in Example 1.
According to the shot blasting method described in 614, an airbag was prepared and evaluated according to the previous example using a sewing needle having a surface polished using a silicon carbide abrasive (type GC, count F500). . As shown in Table 1, no adhesion of the adhesive material to the sewing machine was observed as in Example 1.

Comparative Example 1 An airbag was prepared and evaluated in the same manner as in Example 1, except that the sewing needle was used without imparting lubricity.
As shown in Table 1, a silicone resin as an adhesive material adheres to the sewing needle, which hinders continuous production of many airbags. For example, the uniform up-and-down movement of the needle is impeded, and abnormal tension is applied to the thread and sewing thread that make up the base fabric, causing it to cut.If left unattached, solidification occurs on the surface and the sewing needle becomes thicker. And the seam hole may be large.

Comparative Example 2 As an adhesive material, a condensation-type room-temperature-curable silicone resin (SE9145 manufactured by Dow Corning Toray Silicone Co., Ltd.) was used instead of the addition-type room-temperature-curable silicone of Example 1.
An airbag was prepared and evaluated in the same manner as in Example 1 except that the airbag was used. As shown in Table 1, the adhesion of the adhesive material to the sewing needle is small, but the adhesiveness to the base cloth is poor.

[0062]

[Table 1]

[0063]

As described above, according to the present invention, it is possible to easily mass-produce the side airbag having excellent airtightness.

[Brief description of the drawings]

FIG. 1 is an explanatory view of an airbag made according to the present invention before deployment as viewed from a side window.

FIG. 2 is a sectional view taken along line AA of FIG. 1 after development. The outer peripheral portion of 3 and the thick line of 4a to 4d indicate the adhesive layer.

FIG. 3 is an explanatory view of an outer peripheral sewn portion of an airbag produced according to the present invention.

[Explanation of symbols]

1, 2 airbag body base cloth 3 outer peripheral sewn section of airbag body base cloth 4a-4d sewn section of body base cloth 5a-5e inflated section of airbag 6 and 7 thermosetting silicone coated on body base cloth 8 Adhesive material 9 Sewing thread

Claims (5)

[Claims] 1. A method of manufacturing an airbag, comprising: forming a superposed portion by laminating one main base fabric, an adhesive material layer, and another main base fabric, and sewing the superposed portion into a bag shape. A method for manufacturing an airbag, wherein an additional type room temperature-curable silicone resin is used as the adhesive material layer, and the sewing needle of the sewing machine is provided with lubricity on the surface. 2. The method according to claim 1, wherein the sewing needle is cooled. 3. An airbag manufacturing apparatus, comprising: means for sewing a superposed portion in which one main base fabric, an adhesive material layer, and another main base fabric are superimposed to form a bag shape. ,
An apparatus for manufacturing an airbag, wherein a surface of a sewing needle used for a means for sewing the overlapped portion into a bag shape is imparted with lubricity. 4. The method for manufacturing an airbag manufacturing apparatus according to claim 3, wherein the sewing needle includes a silicone compound, a fluorine compound, a wax, a higher fatty acid, a fatty acid ester, a fatty acid amide, a fatty acid metal salt, a higher fatty acid alcohol, A method for producing an apparatus, wherein one lubricating agent selected from low-molecular-weight polyolefins is provided. 5. The method according to claim 4, wherein the lubricant is baked on the surface of the sewing needle.