JP4444092B2 - Airbag - Google Patents

Description

  The present invention relates to an airbag for protecting an occupant at the time of a vehicle collision, and more particularly to an airbag suitable for protecting a side part having excellent airtightness.

  Airbag systems have become widespread as safety devices for protecting passengers in vehicles, and the number of mounting parts has increased from driver seats to passenger seats, side protections, and rear seats, and the protection function for passengers has increased. In particular, an airbag that protects an occupant from an impact at the time of a side collision, that is, a side portion protecting airbag (hereinafter referred to as a side portion airbag) has been put into practical use as a means for improving safety for the occupant. Against this backdrop, multipurpose vehicles with high vehicle height, excellent mobility and strong leisure properties are preferred, accident cases increase, and there are many cases of rollover. When a vehicle rolls over, that is, rolls over, it is necessary to protect the occupant for a long time of several seconds, and high airtightness of the airbag is required. That is, in a rollover-compatible airbag, the body panel is provided with a coating layer for imparting airtightness, and means for preventing gas leakage from the joint is essential at the joint of the body panel.

Many proposals have been made for a method for preventing gas leakage from a seam of an airbag created by stitching.
For example, Patent Document 1 (Japanese Patent Application Laid-Open No. 2-237737) proposes a method in which a double-sided tape having a thermosetting adhesive on both sides of a cloth is sandwiched between stitched parts and stitched together with a main body base cloth. . In this method, in order to improve the adhesiveness between the adhesive and the stitched portion, it is necessary to perform heat treatment, and the process becomes complicated.

  Patent Document 2 (Japanese Patent Application Laid-Open No. 10-86776) discloses a method in which a joint part bonded and fixed with a hot melt adhesive is further stitched, and then the hot melt adhesive is remelted and solidified by heating the stitched part. Is disclosed. In this method, the gap of the seam is sealed with a hot-melt adhesive, but the hot-melt resin is fluidized and melted by heating. When an inflator with a high gas temperature is used, it is used as a sealing agent. The function may be reduced, or the adhesion may be insufficient depending on the material of the surface of the base fabric.

  Further, Patent Document 3 (Japanese Patent Laid-Open No. 2002-220017) discloses a technique for joining two panels together by stitching with a thread and bonding with an elastic adhesive such as a silicone-based adhesive or a urethane-based adhesive. Has also been proposed. In this method, not only the process of applying the adhesive to the panel surface is indispensable, but also the process of curing the adhesive by heat, pressure, moisture, etc. is necessary, and the manufacturing process becomes complicated as in the prior art described above. .

Each of these methods described above uses a compound having excellent adhesiveness in the stitched portion to close the seam. However, prior to stitching, an adhesive compound coating step and a curing step are required, and the process is complicated. Not only does this increase the overall cost.
JP-A-2-237837 JP-A-10-86776 Japanese Patent Laid-Open No. 2002-220017

The present invention applied a sealing material without impairing the characteristics of the stitched portion by an epoch-making method capable of improving the airtightness of the stitched portion by a simple process, which was impossible with these prior arts. It is an object of the present invention to provide an air bag suitable for protecting a highly airtight side part that can be immediately sewn with a main body panel.
It is another object of the present invention to provide an air bag that can maintain airtightness for a long time even when a vehicle rolls over in the event of a collision.

The present invention relates to an airbag obtained by applying a flexible sheet material coated with an adhesive to a stitched portion in order to prevent gas leakage from the stitched portion.
That is, the present invention

(1) attached to Oite adhesive th stop member on the outer peripheral portion superposed body panel, an air bag has a bag shape by suturing the body panel with adhesive th stopper member, and between said body panel The air bag is formed by sandwiching the adhesive sealing material and stitching and compressing with a suture thread, the adhesive sealing material comprising a flexible sheet material and an adhesive applied to the flexible sheet material. consists, JIS-L-1096 elongation at break in the thickness direction of the flexible sheet material according to (8.12.1 method) Ri der least 500%, the adhesive first stop member is characterized in that it does not cure the air bag.
(2) An airbag in which the main body panels are opposed to each other and formed into a bag shape and connected to each other via one or a plurality of connecting panels that connect the opposing main body panels. An air bag formed by sandwiching an adhesive sealing material therebetween, overlapping, stitching with a suture, and compressing, wherein the sealing material includes a flexible sheet material and an adhesive applied to the flexible sheet material. An air bag comprising: a flexible sheet material having a breaking elongation in a thickness direction of 500% or more according to JIS-L-1096 (8.12.1 method); and the adhesive sealing material is not cured. .
(3) The flexible sheet material has an intermediate layer, and the intermediate layer is a reinforcing layer formed of papers, nonwoven fabrics, films, and the like (1) or (2) Airbag.
(4) The airbag according to any one of (1) to (3), wherein a breaking elongation in the thickness direction of the flexible sheet material is 800% or more.
(5) The airbag according to (1) to (4), wherein the flexible sheet material is made of foamed resin or foamed rubber.
(6) The foamed resin or foamed rubber is composed of one or more selected from acrylic, urethane, silicone, olefin, fluorine, and chlorine-containing (5) ).
(7) The air according to (1) to (6), wherein the pressure-sensitive adhesive is composed of one or more selected from acrylic, urethane, silicone, and halogen-containing. bag.
It is about.

  According to the present invention, it is possible to impart airtightness to an airbag without complicated processes, and particularly suitable for side protection satisfying rollover correspondence that needs to maintain airtightness for a long time. The bag can be provided in a short process.

The airbag of the present invention is an airbag in which a plurality of panels are stitched, and the thickness according to JIS-L-1096 (8.12.1 method) is used to prevent gas leakage from the stitched portion. Adhesive sealing material in which a pressure-sensitive adhesive is applied to at least one surface, preferably both surfaces of the sealing material having a breaking elongation in the direction of 500% or more, preferably 800% or more, more preferably 1000% or more. Is essential. When the breaking elongation of the flexible sheet material is less than 500%, the elongation characteristic with respect to the stretching action applied to the stitched portion due to the inflation of the airbag is insufficient, and the function as the sealing material may not be sufficiently satisfied.

  A rollover-compatible side protection airbag to be mounted around the window, which is one of the objects of the present invention, is usually stitched on the outer periphery of two panels. In order to control the thickness of the airbag at the time, the central part of the inflated region is also stitched, so that it cannot be reversed like a front seat airbag for a driver seat or a passenger seat. Accordingly, when inflated, a force for peeling the two panels directly acts on each of the stitched portions at the outer peripheral portion and the central portion, and the strength of the stitched portion from the viewpoint of the pressure resistance of the airbag, From the standpoint of preventing gas leakage from the seam, the sealing material that closes the seam and the like requires physical properties that counter the peeling action and adhesion to the main body panel.

  In other words, a sealing material that satisfies the required characteristics of a rollover-compatible airbag is required to maintain high strength or high elongation against the peeling action and adhesion to the main body panel over a long period of time. However, a high-strength material often has a high modulus, the sealing portion becomes extremely hard, and the folding volume of the airbag is difficult to be compact. The main body panel of the air bag is often coated with a silicone resin or rubber having excellent heat resistance, and the seam sealing material is a material having adhesiveness to silicone, for example, a highly extensible silicone resin. Or rubber is also used. However, a material that satisfies the characteristics required for the above-mentioned sealing material, that is, a material that satisfies both high extensibility and high adhesion, is devised in the composition of materials such as resin or rubber material components, adhesion-imparting agents, and fillers. As a result, the price of materials tended to increase.

  The adhesive sealing material of the present invention is composed of a flexible sheet material that is a base material for the adhesive sealing material, and an adhesive applied to the surface of the sheet material, so that it consists of a single material as in the past. Compared to trying to satisfy the required properties with sealants, it is possible to use materials with excellent characteristics for two different properties, and the degree of freedom in selecting materials as sealants is increased. The material price can also be reduced.

  In the present invention, the adhesive sealing material having adhesive applied on both sides is applied so as to be sandwiched between the main body panels, and the panels are sewn so that the sewing thread penetrates the adhesive sealing material. It is preferable for enhancing the effect of preventing gas escape.

  In this invention, it is preferable to comprise the flexible sheet material which comprises the base material of an adhesive sealing material, and what is excellent in high extensibility, heat resistance, a softness | flexibility etc. should just be comprised. For example, acrylic resin or rubber (including copolymer), ethylene / vinyl acetate copolymer resin or rubber, polyurethane resin or rubber (including silicone modified, fluorine modified), polystyrene resin or rubber, silicone based One or two or more types selected from resin or rubber, polyolefin-based resin or rubber, fluorine-based resin or rubber, chlorine-containing resin or rubber, etc., or foaming in combination of two or more in some cases It is preferable to use a material. However, the present invention is not limited to these, and versatile materials such as nitrile rubber, styrene / butadiene rubber, butyl rubber, and natural rubber may be used.

As a foaming method of the material, a method usually performed is adopted. For example, 1) mechanical stirring, 2) use of reaction product gas, 3) use of pressurized gas, 4) substitution of soluble materials, 5) use of various foaming agents such as organic or inorganic types, etc. . Further, the expansion ratio may be selected in accordance with the required performance as a sheet material, and is usually 1.1 to 5 times, or apparent specific gravity 0.2 to 0.00.
The foaming state may be independent, continuous, or a mixture thereof. However, the independently foamed one has a high shielding property in the thickness direction and is more effective as a sealing material.
In order to improve the adhesion between the sheet material and the adhesive applied to the surface of the sheet material, the surface of the sheet material is preliminarily treated with 1) chemical treatment such as a primer, and 2) irradiation with plasma, ultraviolet rays, electron beams, etc. It is also preferable to perform treatments such as 3) fine polishing, 4) combination use of these, and the like.

  The pressure-sensitive adhesive applied to at least one surface of the flexible sheet material is not particularly limited as long as the sheet material is strongly adhered to the main body panel, and is excellent in heat resistance, durability, flexibility, for example, acrylic pressure-sensitive adhesive (co-polymer) Combined), ethylene / vinyl acetate copolymer adhesives, silicone adhesives, polyurethane adhesives, halogen-containing adhesives, various rubber adhesives (natural rubber, block copolymers, polyisobutylene / butyl rubber, It is preferable to use one or more pressure-sensitive adhesives selected from polyisoprene rubber. Of these, silicone-based pressure-sensitive adhesives are particularly preferable. These pressure-sensitive adhesives include pressure-sensitive pressure-sensitive adhesives and heat-sensitive hot-melt pressure-sensitive adhesives.

The application amount of the pressure-sensitive adhesive may be selected according to the required characteristics, but the application amount on one side may be in the range of ² to 75 g / m ² or thickness of ² to 150 μm. Also, the coating method may be selected according to the properties of the surface to be coated, the coating amount, the viscosity of the adhesive, etc. For example, 1) coating method (knife, kiss, reverse, comma), 2) printing method (screen, Roll, rotary), 3) laminating method, 4) spraying method, 5) transfer method, etc. may be selected.

  In the present invention, it is preferable to use a gas-impermeable base fabric having a heat-resistant coating material on at least one side as the main body panel in order to reduce gas escape from the airbag main body. The heat-resistant resin may be any material that satisfies the durability, heat resistance, airtightness, abrasion resistance, adhesion to the base fabric, flame retardancy, etc. Silicone resin or rubber, polyurethane resin or rubber (including silicone-modified and fluorine-modified), fluorine-based resin or rubber, chlorine-based resin or rubber, polyester resin or rubber, polyamide-based resin or rubber, epoxy resin, vinyl-based resin, urea One kind or two or more kinds of resin, phenol resin and the like may be used.

  The methods for applying these coating materials to the main fabric are 1) coating method (knife, kiss, reverse, comma, etc.), 2) dipping method, 3) printing method (screen, roll, rotary, etc.), 4) Processing methods such as laminating and 5) spraying may be used. The properties of the coating material may be any of solvent-based, solvent-free, emulsion-based, aqueous-based, or mixed solutions thereof, fine powder, film or sheet.

  In addition, the coating material includes various additives usually used for improving processability, adhesion, durability, weather resistance, etc., such as a crosslinking agent, a reaction accelerator, a reaction retarding agent, a heat stabilizer, Antioxidants, light stabilizers, anti-aging agents, lubricants, smoothing agents, anti-blocking agents, pigments, water repellents, oil repellents, concealing agents such as titanium oxide, gloss imparting agents, flame retardants, plasticizers, etc. One kind or two or more kinds may be selected and used in combination. In addition to the above-mentioned various additives, various pretreatment agents for improving adhesion to the base fabric, adhesion improvers, etc. may be added to the covering material, or the surface of the base fabric may be primed beforehand. The pretreatment may be performed. Furthermore, in order to impart heat resistance, aging resistance, oxidation resistance, etc. to the coating agent, after applying the coating agent to the fabric, drying, crosslinking, vulcanization, etc. are performed with hot air treatment, contact heat treatment, high energy treatment (high frequency treatment) , Electron beam, ultraviolet ray) or the like.

Furthermore, the present invention provides a pressure-sensitive adhesive after applying an adhesive sealing material in which a pressure-sensitive adhesive is applied to at least one surface of a flexible sheet material having a breaking elongation in the thickness direction of 500% or more on a planned stitching portion of the main body panel. This is a method for manufacturing an airbag, which is manufactured by immediately stitching without the curing step. According to the present invention, the adhesive sealing material is applied so as to be sandwiched between the main body panels of the sutured portion, and the main body panel and the adhesive sealing material can be adhered and bonded by pressing, and the adhesive curing step. The airbag can be manufactured by immediately stitching and joining the joint without passing through the above. Alternatively, an adhesive sealing material may be sandwiched between the stacked body panels and then sewn. As described above, various manufacturing methods can be used for the airbag according to the present invention, and an airbag manufacturing method may be appropriately selected according to the shape of the main body panel, the supply form of the flexible sheet, and the like.
In the present invention, since the panels (base fabrics) can be sufficiently airtightly bonded by the adhesive force of the adhesive as described above, the room temperature curing or heat curing step required when using a curable adhesive is not required.

In the case of the conventional method, after applying the sealing material to the main body panel, in order to express the physical properties of the sealing material and improve the adhesion with the main body panel, the curing process of the adhesive, that is, heating, pressurizing, It was necessary to sew after a manufacturing process such as standing at room temperature for a long time. As described above, in the present invention, the main body panel and the sealing material can be integrally sutured by simply attaching the adhesive sealing material to the planned stitching portion, overlaying the main body panel, and pressing it, which is extremely simple. An airbag can be obtained by a simple manufacturing process.
When sticking the adhesive sealant to the main body panel surface, the adhesive sealant may be cut into a certain size or used in the form of a continuous tape or the like. In that case, in order to prevent the adhesives from sticking to each other, the liner used on one or both sides of this adhesive sealant is peeled off and applied to the main body panel. In order not to disturb the pasting work by stretching, the flexible sheet material is provided with a reinforcing layer such as paper, non-woven fabric, and films as an intermediate layer so as not to affect the elongation in the thickness direction. May be.

  The sewing specification of the stitching portion of the present invention may be performed by stitches that are applied to a normal airbag such as main stitching and double chain stitching. The thickness of the sewing thread may be 700 dtex (equivalent to 20th) to 2800 dtex (equivalent to 0th). When a plurality of stitch lines are required, the distance between the stitches is about 2 to 8 mm, and a multi-needle type sewing machine may be used. However, a single-needle sewing machine may be sewn multiple times.

  The sewing thread used for the sewing may be appropriately selected from what is generally called a synthetic fiber sewing thread or an industrial sewing thread. For example, nylon 6, nylon 66, nylon 46, nylon 6T, nylon 9T, etc. There are fiber materials such as polyamide, polyester (including wholly aromatic), vinylon, aromatic polyamide (including ether copolymer), polyoxazole, carbon, glass, etc., spun yarn, filament twisted yarn Any of filament resin processed yarns may be used.

Moreover, the base fabric used for the main body panel of the present invention may be any fabric as long as it satisfies the instantaneous impact force at the time of deployment, the airtightness and pressure resistance as a bag body, the folding volume, etc. It is preferable to use a base fabric having a dense structure composed of 700 dtex yarn. The denseness of the base fabric affects the amount of seam deviation that occurs. For example, it is preferable that the fabric has a cover factor of 720 or more, more preferably 800 to 1120. Here, the cover factor (CF) is a parameter representing the density of the woven fabric structure determined by the product of the thickness decitex of the warp and weft and the fabric density (w / cm) of the warp and weft. The
CF = Nw × √Dw + Nf × √Df
Here, Dw and Df represent the warp and weft thickness (decitex), and Nw and Nf represent the warp and weft fabric density (lines / cm).
The single yarn thickness of the yarn is preferable, for example, by using a thin yarn of 3 decitex or less, because a base fabric rich in flexibility can be obtained even at high density.

  The base fabric used for the airbag main body panel used in the present invention may be woven by various looms used to produce ordinary industrial fabrics, for example, shuttle looms, water jet looms (WJL), An air jet loom (AJL), rapier loom, or projectile loom may be selected. In the present invention, in addition to a normal woven fabric composed of warps and wefts, a triaxial woven fabric, a tetraaxial woven fabric, or the like that has improved the mechanical isotropy of the woven fabric may be used. Moreover, you may use the bag woven structure partially connected by the woven structure with the Jacquard loom. The woven structure may be any of plain weave, twill weave, satin weave, oblique weave, lattice weave (ripstop weave), silk weave, or a combination thereof.

  Moreover, the fiber yarn which comprises the base fabric for main body panels of this invention is not specifically limited, For example, nylon 6, nylon 66, nylon 46, nylon 610, nylon 612 etc. are individual or these copolymerization , Aliphatic polyamide fiber obtained by mixing, copolymer of aliphatic amine and aromatic carboxylic acid typified by nylon 6T and nylon 9T, paraphenylene terephthalamide, typified by copolymer of this with aromatic ether Aromatic polyamide fiber, polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, etc., or a copolymer of these, polyester fiber obtained by mixing, fully aromatic polyester fiber, ultrahigh molecular weight polyolefin Fiber, vinyl Chlorine fibers such as den or polyvinyl chloride, polytetrafluoroethylene-containing fluorine-containing fibers, polyacetal fibers, polysulfone fibers, polyphenylene sulfide fibers (PPS), polyether ether ketone (PEEK) fibers, polyimide fibers, polyethers Imido fiber, polyoxazole fiber such as polyparaphenylene benzbisoxazole (PBO), cellulosic fiber including high strength rayon, vinylon fiber, acrylic fiber, silicon carbide fiber, alumina fiber, glass fiber, carbon fiber, depending on circumstances May be appropriately selected from metal fibers typified by steel.

  These fiber yarns have various additives that are commonly used to improve spinnability, processability, and material durability, such as heat stabilizers, antioxidants, light stabilizers, anti-aging agents, One or more of 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. Moreover, you may give processes, such as twisting, a bulky process, a crimping process, and a winding process depending on the case. Furthermore, the form of the yarn is not particularly limited, such as filaments of long fibers, spun yarns of short fibers, and composite yarns thereof.

The specifications, shape, and capacity of the airbag according to the present invention may be selected according to the site to be disposed, the application, the storage space, the impact absorption performance with the contact object, the output of the inflator, and the like.
Also, rollover-compatible airbags require extremely high airtightness, so there is usually no exhaust hole for gas exhaust, but when high energy absorption is required when the occupant comes into contact, One or a plurality of exhaust holes, a function of adjusting the internal pressure by allowing gas to flow into the adjacent expansion portion when the internal pressure of the expansion portion reaches a certain level or more, and the like may be provided. For example, a circular hole having a diameter of about φ10 mm to φ40 mm or a hole having an area corresponding to the circular hole may be provided, and a reinforcing cloth may be joined around the exhaust hole. The internal pressure adjustment function may be based on a tear seam by sewing, bonding, or the like, and an adjacent auxiliary expansion part. Moreover, you may provide parts, such as an auxiliary member for promoting the expansion | deployment performance of an airbag, and a baffle cloth for controlling the gas flow inside an airbag.

In the present invention, depending on the characteristics of the inflator used, a heat-resistant protective cloth or a mechanical reinforcing cloth for protecting the airbag body base cloth from the hot gas from the inflator may be provided. These protective cloths and reinforcing cloths are made of heat-resistant materials such as wholly aromatic polyamide fibers, wholly aromatic polyester fibers, polyimide fibers, fluorine-containing fibers, and polyoxazole fibers. It may be used, or a base fabric such as a woven fabric using a thread thicker than the main body base fabric that is the same as or separately prepared from the airbag main body may be coated with a heat resistant material, or a coating material may not be applied. You may use for.
The airbag can be folded using the bellows folding, folding screen-like zigzag folding, roll-up winding, or a combination of these. Bending, roll winding, etc. may be employed.

  The airbag of the present invention is suitable for obtaining high airtightness of the side protection airbag. For example, the headrest bag for protecting the front seat of the driver's seat and the passenger seat, the rear-end collision protection, the leg / foot portion Functionally satisfied in addition to various applications such as protective knee bags and footbags, pedestrian protective airbags, infant protection (child seat) mini bags, air belt bags, passenger cars, trucks, buses, and motorcycles. As long as it is a thing, you may apply to other uses, such as a ship, a train, an airplane, another transport means, amusement park facilities.

  Hereinafter, the present invention will be described more specifically based on examples. In the examples, the performance of the airbag body was evaluated by the following method.

(1) Breaking elongation in thickness direction As shown in FIG. 1, a sample in which an adhesive sealant 8 was sandwiched between one end of two main body panel cut pieces 1 and 2 was prepared. FIG. 2 is a conceptual diagram showing an example of the adhesive sealing material 8. As shown in FIG. 2, the adhesive sealing material 8 is formed by applying adhesives 7 a and 7 b to both surfaces of a highly extensible flexible sheet material 6. Next, the two main body panel cut pieces 1 and 2 are pulled up and down, and the elongation at the time when the tensioned adhesive sealing material starts to break is measured. ) The tensile conditions were measured according to JIS L-1096 (8.12.1 method) at a tensile speed of 200 mm / min.

(2) Airtightness of the airbag The airbag shown in FIG. 3 is prepared, and the inflator (tank pressure 200 kpa, helium gas type inflator manufactured by Daicel) is fixed to the inflator insertion portion 10 together with the fixing bracket, and the airbag is brought to room temperature. Expanded. The maximum internal pressure of the airbag and the internal pressure retention rate (%) 5 seconds after the start of deployment were determined.

(3) Comparison of manufacturing process The time required for the manufacturing process of the airbag was measured, and the time when manufactured according to the present invention was set as 100, and a relative comparison was made.

Example 1
A plain woven fabric having a weaving density of 23 yarns / cm and a weaving density of 23 yarns / cm was prepared using nylon 66 fiber 350 dtex / 144 f (yarn strength 8.6 cN / dtex). This woven fabric was scoured and heat-set, and then a solventless addition type silicone resin was applied to one side of the woven fabric at 30 g / m ² (in terms of solid content). The weave density was 24.5 pieces / cm for both warp and weft, and the cover factor was 917.

Next, two base fabrics for the main body panel were cut into the shape shown in FIG. 3 as the main body panel of the airbag. The overall size of the airbag is 165 cm in length and 55 cm in height, and the cut cloth 2 has a shape in which the central portion of the cut cloth 1 is deleted along the joining line. An adhesive sealing material having adhesive applied to both sides was attached to the stitched portions of the outer periphery stitched portion 3 and the inner stitched portions 4a to 4d on the coated surface side of the cut piece 1 with a width of 12 mm. The adhesive sealing material is an acrylic resin foamed flexible sheet material, and a silicone-based adhesive applied on both sides (adhesive tape G manufactured by Sumitomo 3M Limited).
The thickness of the double-sided adhesive heat-resistant product of T7112, the adhesive sealing material is 1.0 mm, and the adhesive coating thickness is 75 μm on each surface). The same material cut into a circle was used for the circular stitched portion at the center. Next, the cut pieces 2 were overlapped, and the stitched portion sandwiching the adhesive sealing material was pressure-bonded with a roller having a weight of 6 kg and stitched. For sewing, the circular part at the center is one row of main stitches (4 stitches / cm), and the other stitches are two rows of double ring stitches (3.5 stitches / cm, the distance between stitches is 2.4 mm). ), And the sewing thread is made of nylon 66 fiber. The upper and lower threads are 8th thread (equivalent to 940 dtex, thread strength 7.8 cN / dtex), and the double thread stitch is 5th thread. (Equivalent to 1470 dtex, thread strength of 7.8 cN / dtex), the same 8th thread as that used for the main thread for the lower thread was used.
FIG. 4 is a cross-sectional view taken along the line AA after development in FIG. 3. The adhesive stitching material 8 is applied to the outer peripheral portion 3 of the cut pieces 1 and 2 so as to be sewn into a bag shape, and the inner stitching portions 4 a and 4 b of the airbag are stitched via the adhesive stitching material 8. 5a to 5e are parts filled with gas.

  Measurement of elongation at break of the stitched portion of the obtained airbag and a deployment test were performed. The airtightness of the airbag is excellent, and the manufacturing process can be simplified as compared with a manufacturing method using a conventional sealing material (Comparative Example 2 described later).

Example 2
In Example 1, a plain woven fabric having a weaving density of 51 pieces / cm after passing through a 470 dtex / 144 f (yarn strength of 8.6 cN / dtex) and coating 40 g / m ² of silicone resin on one side. (The cover factor is 867), and an airbag was created according to Example 1 except that a silicone-based foam was used as the flexible sheet material.
The breaking elongation of the stitched portion of the obtained airbag and a deployment test were performed. Like Example 1, it was excellent in airtightness and the manufacturing process was short.

Comparative Example 1
In Example 1, an airbag was produced according to Example 1 except that a polyurethane resin foam whose breaking elongation in the thickness direction did not satisfy the requirements of the present invention was used as the base material of the sealing material. The manufacturing process was the same as in Example 1, but when the breaking elongation in the thickness direction of the stitched portion was low, the airtightness in the development test was low.

Comparative Example 2
In Example 2, an addition type thermosetting silicone resin (product of Toray Dow Co., SE1700) was applied as a sealing material, and the sealing material was cured by heat treatment at 160 ° C. for 2 minutes. An air bag was made according to the above. Since the breaking elongation of the stitched portion is low, the airtightness in the development test is low, and a long time is required for the manufacturing process.

Comparative Example 3
In Example 2, an airbag was prepared without using an adhesive sealant. Although the manufacturing process was short, no high elongation material was used for the stitched portion, so the elongation at break was low and the airtightness was extremely poor.

  Fig.5 (a) is sectional drawing which shows an example of another embodiment in the airbag which concerns on this invention. As shown in FIG. 5, the airbag is formed in a bag shape by facing the main body panels 11 and 12 and stitching the outer periphery. An adhesive sealing material 18 is sandwiched between the main body panels 11 and 12 at the stitched portion, and is sewn by a suture thread 13. Connecting panels (baffle panels) 21 and 22 are stitched at two locations on the main body panels 11 and 12, and the airbag is divided into three locations. A through hole 19 is formed in the connection panels 21 and 22. In addition, although the through-hole 19 in this embodiment is drilled in a substantially intermediate portion of the connection panels 21 and 22, one end of the connection panels 21 and 22 may be separated without being sewn to the main body panel 11 or 12. That is, any structure can be adopted as long as the structure allows gas to pass through.

  The main body panel side ends of the connection panels 21 and 22 are stitched together with the main body panels 11 and 12. The stitched portion is sewn with a suture thread 13 with an adhesive sealing material 18 sandwiched between the inner side of the main body panel and the outer side of the folded ends of the connection panels 21 and 22. Further, as shown in part (b), the adhesive sealing material 18 is sandwiched between the inner side of the main body panel and the outer side of the connecting panel 22, and the adhesive is attached to the inner side of the folded end of the connecting panel 22. After fixing the sexual sealant 28, it may be sutured with the suture 13 [see FIG. 5 (b)]. Alternatively, as shown in part (c), the adhesive sealing material 18 is sandwiched between the inner side of the main body panel and the outer side of the folded end portion of the connection panel 22, and sutured with the suture thread 13. The adhesive sealing material 28 may be fixed to a stitched trace on the inner side of the folded end.

  FIG. 6 shows an example (single-sided adhesive type) in which no adhesive is applied to the contact surfaces of the adhesive sealants 38a and 38b. The adhesive sealing materials 38a and 38b are composed of flexible sheet materials 36a and 36b and adhesive layers 37a and 37b. By sandwiching the adhesive sealing members 38a and 38b between the main body panels 31 and 32, the main body panels 31 and 32 are sewn and compressed by the suture thread 33 to obtain airtightness. Such a single-sided adhesive type sealing material is also useful for an air bag that is sufficient for medium to low airtightness.

  FIG. 7 shows an example in which the adhesive sealing members 48 and 58 are applied so as to wrap the suture ear (terminal edge). FIG. 7A shows the main body by the suture thread 43 after the adhesive sealing member 48 is fixed. Panels 41 and 42 are stitched. The adhesive sealing material 48 is composed of a flexible sheet material 47 and an adhesive layer 46. FIG. 7B shows an example in which an adhesive sealing material 58 is applied after stitching. The adhesive sealing material 58 is composed of a flexible sheet material 57 and an adhesive layer 56.

  FIG. 8 shows that the adhesive sealant 68a is sandwiched between the stitched portions of the main body panels 61 and 62, and the adhesive sealant 68b is fixed in a bridge shape from the back surface of the stitched portion. Fig. 5 shows that an extremely high airtightness (internal pressure retention) is obtained together with the adhesive sealant 68a applied in a sandwich shape. Each adhesive sealing material 68a, 68b is composed of flexible sheet materials 66a, 66b and adhesive layers 67a, 67b.

It is sectional drawing of the sample for the breaking elongation measurement of the horizontal direction of a stitching | suture part. It is sectional drawing of the adhesive sealing material which apply | coated the adhesive on both surfaces which become this invention. It is explanatory drawing before the expansion | deployment which looked at the airbag which becomes this invention from the side window part. It is AA arrow sectional drawing after the expansion | deployment in FIG. It is sectional drawing which shows an example of another Example which concerns on this invention. (A) is sectional drawing which shows an example of another embodiment in the airbag which concerns on this invention, (b) is a conceptual diagram of the (b) part in Fig. (A), (c) is a figure (a). It is a conceptual diagram of the (c) part in FIG. It is sectional drawing which shows an example of the stitching | suture part of the outer peripheral part which becomes this invention. It is sectional drawing which shows an example of the stitching | suture part of the outer peripheral part which becomes this invention. (A) is sectional drawing which shows the example which sewed after wrapping a suture ear | edge part, (b) is sectional drawing which shows the example which applied the adhesive eye-stopper after sewing. It is sectional drawing which shows an example of the stitching | suture part of the outer peripheral part which becomes this invention.

Explanation of symbols

1, 2, 11, 12, 31, 32, 41, 42, 51, 52... Airbag body panel 3... Peripheral stitched portion 13, 33, 43, 53, 63. 4d ... Internal stitching part between main body panels 5a to 5e ... Inflatable part of airbag 6, 36a, 36b, 46, 56, 66a, 66b ... Flexible sheet material 7, 7a, 7b, 37a, 37b, 47 , 57, 67a, 67b ... adhesive 8, 18, 38a, 38b, 48, 58, 68a, 68b ... adhesive sealant 10 ... inflator mounting port 21, 22 ... connection panel

Claims (7)

Attached to Oite adhesive th stop member on the outer peripheral portion superposed body panels, the adhesive with sticky eyes stopper material by suturing the body panel The airbag has a bag shape, and between the body panel An air bag formed by sandwiching an adhesive sealing material, compressed by sewing with a suture, and the adhesive sealing material comprises a flexible sheet material and an adhesive applied to the flexible sheet material, JIS-L-1096 elongation at break in the thickness direction of the flexible sheet material according to (8.12.1 method) Ri der least 500%, an air bag wherein the adhesive first stop member is characterized in that it does not cure. An airbag that is formed into a bag shape with the main body panels facing each other and connected to each other via one or more connecting panels that connect the opposing main body panels, and is adhered between the main body panel and the base panel side base of the connecting panel. An air bag formed by sandwiching and stacking a natural sealing material , stitching with a suture and compressing, wherein the sealing material comprises a flexible sheet material and an adhesive applied to the flexible sheet material, JIS-L-1096 elongation at break in the thickness direction of the flexible sheet material according to (8.12.1 method) Ri der least 500%, an air bag wherein the adhesive first stop member is characterized in that it does not cure. The airbag according to claim 1 or 2, wherein the flexible sheet material has an intermediate layer, and the intermediate layer is a reinforcing layer formed of paper, nonwoven fabric, or films. The airbag according to any one of claims 1 to 3, wherein the flexible sheet material has a breaking elongation in the thickness direction of 800% or more. The airbag according to any one of claims 1 to 4, wherein the flexible sheet material is made of foamed resin or foamed rubber. 6. The foamed resin or foamed rubber is composed of one or more selected from acrylic, urethane, silicone, olefin, fluorine, and chlorine-containing systems. Airbag. The airbag according to any one of claims 1 to 6, wherein the pressure-sensitive adhesive is composed of one or more selected from acrylic, urethane, silicone, and halogen-containing.

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