JP2009214728A - Airbag and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an airbag superior in lightness, housing property and cost, while securing airtightness, and its manufacturing method. <P>SOLUTION: This airbag is made by joining edge parts with each other of two sheets of panels having non-ventilation treatment agent with an adhesive sealing material. In the airbag, the adhesive sealing material includes air, and a sewing part is provided on the adhesive sealing material. It is desirable that the adhesive sealing material has a hollow shape. The adhesive sealing material desirably has a plurality of air bubbles. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an airbag that is mounted on a vehicle or the like and protects an occupant from impacts such as a collision or rollover, and a method for manufacturing the airbag. More specifically, the present invention relates to an airbag in which two panels are joined, and is excellent in lightness, storage property, and airtightness, and particularly useful for side collision.

  It has been a long time since a vehicle seat airbag, a passenger seat airbag, a passenger seat airbag, and a rear seat airbag have been installed as vehicle airbags. In recent years, the use of side airbags and curtain shield airbags corresponding to side collisions has increased. Among these, curtain shield airbags corresponding to vehicle rollovers have attracted attention, which includes a long period of several seconds during which the vehicle rolls over in order to absorb the impact on the occupant's head. It is required to maintain the internal pressure over the entire area. In order to cope with airbags of these various forms and required performance, it is urgent to develop an airbag capable of increasing the airtightness of the airbag and extending the inflating duration more than before.

  As such an airbag, Patent Document 1 discloses that gas leakage from a joint portion is made by joining edges of two panels made of woven fabric or the like by bonding with an elastic adhesive and stitching with a thread. An airbag that prevents the above is disclosed.

  In this way, by sewing the adhesive portion, problems such as gas leaks caused by needle holes and openings in the sewing portion are reduced or eliminated, and the air tightness of the airbag is improved. However, in order for this adhesive to fulfill the role as an adhesive sealing material that prevents gas leaks at the sewing part, it is necessary that the adhesive sealing material near the sewing part be maintained without breaking when the airbag is deployed. It is. For this purpose, the adhesive seal material must be sewn securely.

  Prevention of gas leakage from the sewing portion is achieved by protecting the sewing portion by an adhesive seal material extending from the sewing portion to the bag inflating portion side when the bag is unfolded. Therefore, originally, an adhesive seal material from the sewing part to the non-expanded part is unnecessary, and it is conceivable to reduce the adhesive seal material in that part from the viewpoint of weight reduction and the like. Patent Document 2 discloses an airbag formed by sewing an end portion of an adhesive sealing material on the side of an anti-expansion chamber or the vicinity thereof. Sewing the end of the adhesive seal material is actually difficult to sew to the end accurately because there is a step due to the thickness of the adhesive seal material at the end of the adhesive seal material. Sewing around a little away. If the sewing position is too far from the end of the adhesive seal material, the adhesive seal material may be stretched and broken when the bag is deployed, and gas leakage from the stitched portion may occur.

  In addition, it is important that the distance from the sewing portion to the end of the adhesive seal material is a constant value so that the development pressure is uniformly applied to all the sewing portions. However, since sewing is usually performed visually, it is very difficult to keep the distance constant.

  As described above, recent airbags are required to be lighter, improve storage, and reduce costs. As one of countermeasures, it is required to reduce the amount of elastic adhesive used. However, if the amount of the elastic adhesive used is reduced, there is a problem that a sufficient thickness and width of the adhesive for satisfying the gas leak prevention performance cannot be secured.

JP 2001-1854 A JP 2003-2149 A

  The present invention has been made in view of such a current situation, and provides an airbag and a method of manufacturing the airbag that are excellent in lightness and storage property and cost-effective while ensuring airtightness. For the purpose.

  As a result of intensive studies to solve the above problems, the present inventor has found that by including air in the adhesive sealing material, it is possible to obtain lightness and storage properties while ensuring sufficient airtightness. The present invention has been achieved.

  That is, the present invention is an airbag formed by joining the edges of two panels having an air-impermeable treatment agent with an adhesive seal material, the adhesive seal material enclosing air, and the adhesive seal The present invention relates to an airbag having a sewing portion on a material.

  The adhesive sealing material is preferably hollow.

  The adhesive sealing material preferably has a plurality of bubbles.

  The present invention also relates to a side collision airbag comprising the airbag.

  Furthermore, the present invention is an air bag manufacturing method in which the edges of the first panel and the second panel are bonded to each other with an adhesive seal material, the step of applying an air-impermeable treatment agent to the base fabric, A step of cutting out the first panel and the second panel from the base fabric, and arranging an adhesive seal material in the vicinity of the edge of the cut out first panel and the second panel so that the cross section has a concave shape The present invention relates to a method of manufacturing an airbag including a step, a step of joining a first panel and a second panel, and a step of stitching the adhesive seal material.

  Furthermore, it is a manufacturing method of the airbag by which the edge parts of a 1st panel and a 2nd panel are joined by the adhesive sealing material, Comprising: The process of providing an air permeability treatment agent to a base fabric, From this base fabric A step of cutting out the first panel and the second panel, a step of arranging an adhesive sealant in the vicinity of the edge of the cut out first panel and / or the second panel, and air inside the adhesive sealant The present invention relates to a method for manufacturing an airbag including a step of injecting, a step of joining a first panel and a second panel, and a step of stitching the adhesive seal material.

  Furthermore, it is a manufacturing method of the airbag by which the edge parts of a 1st panel and a 2nd panel are joined by the adhesive sealing material, Comprising: The process of providing an air permeability treatment agent to a base fabric, From this base fabric A step of cutting out the first panel and the second panel, a step of disposing an adhesive sealant in the vicinity of the edge of the cut out first panel or the second panel while injecting air therein, It is related with the manufacturing method of an airbag including the process of joining the panel of this, and a 2nd panel, and the process of stitching | sutures on this adhesive sealing material.

  According to the present invention, since the adhesive sealing material contains air, it is possible to reduce the applied amount of the adhesive sealing material itself while reducing the material cost while securing the adhesive area and thickness necessary for airtightness. it can. Furthermore, since the air part included in the adhesive sealing material can be used as a mark during sewing, the adhesive sealing material can be reliably sewn, and further, the sewing part and the end of the adhesive sealing material can be connected. It becomes easy to maintain the distance at a constant value, and airtightness can be obtained even in a pressurized state when the airbag is deployed.

  The airbag of the present invention is formed by joining the edges of two panels having an air-impermeable treatment agent with an adhesive sealing material, the adhesive sealing material contains air, and is sewn on the adhesive sealing material. Has a part.

  Airbags are required to be lighter, easier to store, and cost-reduced. However, if the amount of adhesive sealant applied is reduced for that purpose, the thickness and width of the adhesive sealant will naturally decrease. . In particular, if the thickness of the adhesive sealing material is small, the adhesive sealing material is easily broken when the airbag is deployed, and the airtightness cannot be maintained.

  Therefore, in the present invention, air is included in the adhesive sealing material. Thereby, even if it is a small amount, it is possible to give the adhesive seal material a desired thickness. Further, the shape of the adhesive seal material at the time of application can be maintained without causing the adhesive seal material to be crushed by the air inside the adhesive seal material even when the panels are joined by pressure bonding. In other words, since it is possible to join without reducing the applied thickness of the adhesive seal material, it is not necessary to apply an excessive amount of adhesive seal material in consideration of the thickness reduction due to the crimping, and the weight is reduced. Storability and cost reduction can be achieved.

Hereinafter, the present invention will be described in detail with reference to the drawings.
As shown in FIG. 5, the present invention is an airbag 5 in which edges of a first panel 4 and a second panel (not shown) are joined together by an adhesive seal material. The figure which expanded the part shown with the code | symbol 9 is shown in FIG. 2 and FIG. 4, respectively.

  1 and 3 are sectional views of the adhesive sealing material in the airbag of the present invention. In FIG. 1, the adhesive sealing material is arranged in a hollow shape, and the adhesive sealing material of FIG. 3 has a plurality of bubbles inside. Reference numeral 3 denotes a stitched portion.

  Both the air 2 in FIG. 1 and the air 2 (bubbles) in FIG. 3 are included in the adhesive seal material with a certain width. This width is defined as an air layer width 6. The air layer width 6 is preferably 25 to 90% and more preferably 30 to 70% with respect to the adhesive sealant width 7 after curing. If the air layer width 6 is smaller than 25%, the subsequent sewing tends to be easily detached from the adhesive seal material part, and thus the air layer width part. If it exceeds 90%, the adhesive covering the encapsulated air 2 is likely to occur. Since the thickness of the sealing material 1 itself is reduced, the sealing material 1 tends to be broken, and there is a tendency that the airtightness sufficient to enclose air cannot be maintained.

  The encapsulated air 2 is preferably 5 to 50% of the total volume of the cured adhesive seal material and the encapsulated air. If the volume of the encapsulated air 2 is smaller than 5%, the effect of enclosing the air tends to be low, and if it exceeds 50%, the thickness of the adhesive sealing material 1 itself covering the encapsulated air 2 is thin. Therefore, it tends to be torn and tends not to have sufficient airtightness to enclose air.

  As shown in FIG. 3, when the encapsulated air 2 is composed of a plurality of bubbles, the size of each bubble is not particularly limited, but is preferably 0.5 mm or more in diameter. If the diameter of the bubbles is smaller than 0.5 mm, it is difficult to find them by visual observation, and it becomes difficult to determine the sewing position using the bubbles as a mark when sewing in the subsequent process. However, it is not necessary for all the bubbles to have a diameter of 0.5 mm or more, and it is sufficient that bubbles having a diameter of 0.5 mm or more exist to such an extent that a line by the bubbles can be visually confirmed.

  The width 7 after curing of the adhesive sealing material 1 is preferably 7 to 20 mm. If the adhesive sealant width 7 is smaller than 7 mm, a sufficient air layer width 6 tends not to be secured, and if it exceeds 20 mm, the joint becomes bulky and tends to be inferior in storability.

  The air layer width 6 is preferably 5 to 18 mm. If the air layer width 6 is smaller than 5 mm, the sewing performed in the subsequent process may be removed from the adhesive seal material. If the air layer width 6 exceeds 18 mm, the thickness of the adhesive seal material 1 itself covering the enclosed air 2 is thin. Therefore, since the distance from the end of the air layer to the sewing thread 3 by sewing performed later becomes too large, the adhesive sealing material stretches and breaks when the airbag is deployed, thereby preventing gas leakage. Tend to be difficult.

  Moreover, as for the thickness 8 after hardening of the adhesive sealing material 1, 1-2 mm is preferable. When the thickness is less than 1 mm, the airtightness of the airbag tends not to be maintained, and when the thickness exceeds 2 mm, the air bag tends to be inferior.

  A fiber fabric is used for the base fabric constituting the airbag of the present invention. Here, the fiber fabric means a woven fabric woven using fiber yarns, a knitted fabric and a non-woven fabric knitted using fiber yarns.

  The fibers constituting the fiber fabric are not particularly limited, such as natural fibers, chemical fibers, and inorganic fibers. Of these, synthetic fiber filaments are preferred from the viewpoints of versatility and the production process of the base fabric and physical properties of the base fabric. For example, Nylon 6, Nylon 66, Nylon 46, Nylon 610, Nylon 612 and the like, or aliphatic amine fibers obtained by copolymerization and mixing thereof, nylon 6T, nylon 6I, nylon 9T and aliphatic amines Copolymerized polyamide fiber of aromatic carboxylic acid, polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate alone or a copolymer thereof, polyester fiber obtained by mixing, ultrahigh molecular weight polyolefin fiber, vinylidene, Chlorine-containing fibers such as polyvinyl chloride, fluorine-containing fibers containing polytetrafluoroethylene, polyacetal fibers, polysulfone fibers, polyphenylene sulfide fibers (PPS), polyether ether Terketone fiber (PEEK), wholly aromatic polyamide fiber, wholly aromatic polyester fiber, polyimide fiber, polyetherimide fiber, polyparaphenylene benzbisoxazole fiber (PBO), vinylon fiber, acrylic fiber One kind or two or more kinds may be appropriately selected from cellulose fiber, silicon carbide fiber, alumina fiber, glass fiber, carbon fiber, steel fiber, and the like. Among these, nylon 66 fiber is preferable from the viewpoint of physical properties, durability, heat resistance, and the like. From the viewpoint of recycling, polyester fibers and nylon 6 fibers are also preferable.

  These fibers include various additives that are usually used to improve spinnability, processability, durability, and the like, for example, heat stabilizers, antioxidants, light stabilizers, anti-aging agents, and lubricants. One or more of 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 addition, when it is desirable to weave the calami weave, processing such as twisting, bulking, crimping, winding, or gluing may be performed. Further, as the form of the yarn, in addition to the long fiber filament, a spun yarn of short fibers, a composite yarn of these, or the like may be used.

  For example, when the fiber fabric is a woven fabric, it may be a plain weave, an oblique weave (basket weave), a lattice weave (ripstop weave), a twill weave, a knot weave, an entangled weave, an imitation weave, or a composite structure thereof. In some cases, in addition to the two axes of warp and weft, a multi-axis design including 60 degrees oblique may be used, and the yarn arrangement in that case may be the same as the arrangement of warp or weft. Of these, plain weaving is preferable in that the denseness of the structure, the uniformity of physical properties and performance can be ensured.

  Fabric manufacture may be selected from various looms used for weaving ordinary industrial fabrics, for example, shuttle looms, water jet looms, air jet looms, rapier looms, projectile looms, etc. .

  When the fiber fabric is a knitted fabric, a single knitting structure such as a single knitting such as a single tricot knitting, a single cord knitting, a single atlas knitting, a weft knitting such as a flat knitting, a rubber knitting or a pearl knitting, or a combination thereof. And those composed of double tissues. Moreover, when the said fiber fabric is a nonwoven fabric, what is manufactured by a chemical bond, a thermal bond, a needle punch, a spunlace, a stitch bond, a spun bond, a melt blow, wet, etc. is mentioned.

  Further, the single yarn thickness of the yarn used in the present invention may be the same or different, and is preferably in the range of 0.5 to 8 dtex, for example. Further, the strength of the single yarn may be 5.4 cN / dtex or more, preferably 8 cN / dtex or more. The cross-sectional shape of the single yarn of these fibers may be appropriately selected within a range that does not hinder the production of the fabric and the physical properties of the obtained fabric, such as a circle, an ellipse, a flat shape, a polygon, a hollow, and other irregular shapes. Alternatively, a plurality of yarns having different thicknesses or cross-sectional shapes may be integrated by combining, twisting, or the like.

  The total fineness of these fibers is preferably 150 to 1000 dtex, more preferably 235 to 700 dtex. If it is less than 150 dtex, the strength required for the airbag tends to be difficult to obtain. If it exceeds 1000 dtex, the weight becomes too large, and the thickness of the base fabric may increase, resulting in poor bag storage.

The fabric of the present invention comprising these yarns preferably has a basis weight of 190 g / m ² or less and a tensile strength of 600 N / cm or more. If the basis weight and tensile strength are within this range, it can be said that it is light and excellent in physical properties. Here, the basis weight refers to the weight of the base fabric in an unprocessed state before application of an air permeability treatment agent to be described later.

The cover factor when the fiber fabric is a woven fabric is preferably 1500-2500. If the cover factor is less than 1500, the opening of the fabric will be large and it will be difficult to obtain the airtightness of the bag. If the cover factor is greater than 2500, the thickness of the fabric will increase and the bag will not be easily stored. There is a fear. Here, the cover factor means that the warp yarn total fineness is D ₁ (dtex), the warp yarn density is N ₁ (lines / 2.54 cm), the weft total yarn fineness is D ₂ (dtex), and the weft yarn density Is N ₂ (lines / 2.54 cm), (D ₁ × 0.9) ^1/2 × N ₁ + (D ₂ × 0.9) ^1/2 × N ₂ .

  Further, the fiber fabric may be subjected to scouring and heat treatment.

  These fabrics have a non-venting agent for the purpose of improving heat resistance and reducing air permeability. For that purpose, the air-impermeable treatment agent is attached to at least the entire surface of one side of the panel, but intervenes on the panel surface, the gap between yarn bundles constituting the panel, or the gap between single fibers. You may do it. For the reason that damage to the coating can be suppressed even when an external force is applied to the airbag base fabric, it is possible to fabricate the airbag so that the surfaces having the air-impermeable treatment agent of the panel are joined together so that the coated surface is on the inside. preferable.

  The non-aeration treatment agent is a treatment agent that substantially prevents air from passing through. The non-aeration treatment means 8.27.1 A method (fragile type method) in JIS L1096 “General Textile Test Method”. The measured value is 0.0.

  Examples of the air-impermeable treatment agent include halogen-containing rubbers such as chloroprene rubber, high baron rubber, and fluorine rubber, silicone rubber, ethylene propylene rubber, ethylene propylene terpolymer rubber, nitrile butadiene rubber, styrene butadiene rubber, isobutylene isoprene rubber, Rubbers such as urethane rubber and acrylic rubber, and halogen-containing resins such as vinyl chloride resin, vinylidene chloride resin, chlorinated polyolefin resin and fluororesin, urethane resin, acrylic resin, ester resin, amide resin, olefin resin and silicone resin These are used, and these are used alone or in combination. Of these, silicone rubber and silicone resin are preferable in terms of excellent flexibility, heat resistance, and weather resistance.

  Moreover, the resin or rubber | gum similar to what is used for an adhesive sealing material can be used as a non-air-permeable processing agent. It is not necessary for the air-permeable treatment agent and the component forming the adhesive seal material to be the same, as long as they satisfy the performance as the air-permeable treatment agent. In particular, it is preferable that these are similar components because the compatibility of the interface between the surface of the panel having the air-impermeable agent and the adhesive sealant is improved, and as a result, the adhesiveness is improved. Furthermore, if these are the same components, it is advantageous in terms of quality control and economy.

  The viscosity at 25 ° C. of such an aeration treating agent is preferably in the range of 1,000 to 50,000 mPa · s from the viewpoint of the strength of the coating film to be obtained and blending workability.

  The form before the coating of the air-impermeable treatment agent is not particularly limited, and examples thereof include a solventless type, a solvent dilution type, and a water dispersion type. Of these, the solventless type is preferable in terms of workability and environment.

Moreover, it is preferable that the adhesion amount is 40 g / m < ² > or less by dry weight. The lower limit is preferably 5 g / m ² . If the adhesion amount is less than 5 g / m ² , the air permeability of the fabric tends to be high, and there is a tendency for the air tightness of the airbag to occur. If the adhesion amount exceeds 40 g / m ² , the thickness of the fabric increases. Therefore, there is a possibility that a problem arises in the storing property of the airbag.

  Furthermore, for the purpose of smoothly deploying the airbag, it is preferable to perform a process for reducing the friction of the coating film obtained by the non-venting agent. Specifically, as the treatment, a method of applying a fine powder such as talc to the coating, a method of coating by treating the treatment agent with a substance that reduces adhesiveness after curing such as an organic titanium compound, and Examples thereof include a method of imparting irregularities to the coating using an embossing device or the like.

  Moreover, it is preferable that the adhesive sealing material used in the present invention has elasticity having an elongation at break of 800% or more. If the elongation at break is 800% or more, it can sufficiently cope with the inflation of the airbag, so there is no fear of breakage and high airtightness is maintained. Although it is preferable that the elongation at break is large, it is practically 2000% or less.

  Moreover, it is preferable that the hardness according to the JISK6251 is 3-30. If the hardness is less than 3, the deformation when the seal is touched increases, and the airtightness of the airbag tends to be inferior. If the hardness exceeds 30, the entire airbag is difficult to fold and the storage property deteriorates. Tend to.

  The adhesive sealing material is not particularly limited as long as it can firmly bond two panels. For example, it may be appropriately selected from silicone adhesives, polyurethane adhesives, polyamide adhesives, nitrile rubber adhesives, etc., and may be thermoplastic or thermosetting.

  Examples of the curing mechanism include room temperature moisture curing type, room temperature condensation reaction type, room temperature addition reaction type, and heat curing type. Of these, the room temperature curing type is preferable from the viewpoint of easy handling, and the addition reaction type is preferable from the viewpoint that there is no by-product.

  In addition, when the panel is covered with a silicone rubber-based air-impermeable treatment agent, the adhesive sealant is also preferably a silicone-based material. When the panel is covered with a urethane resin, the panel is urethane-based. Is preferred.

  Examples of the form of the adhesive sealing material include one liquid, two liquids, and three or more liquids. Among these, a so-called two-pack type in which a composition comprising at least each component such as a main agent, a curing agent, a catalyst, and a filler is stored in two liquids is preferable in terms of easy handling. Specifically, for example, a two-component addition reaction type silicone rubber composition may be mentioned.

  The viscosity at 25 ° C. immediately after mixing of the adhesive sealant is preferably 300 to 1000 Pa · s. When the viscosity is less than 300 Pa · s, it tends to flow and cannot maintain a uniform seal thickness. Further, when the viscosity exceeds 1000 Pa · s, the operation tends to be difficult. Further, the viscosity at 25 ° C. of the two liquids before mixing is preferably 300 to 1000 Pa · s, respectively, and if the respective viscosities are substantially equal, the handling property at the time of mixing and the application amount control become easy. And more preferable.

The airbag of the present invention can be manufactured by the following method.
First, the air-impermeable treatment agent is applied to the base fabric constituting the panel to cover at least one side of the base fabric.

  As coating methods, 1) coating method (knife, kiss, reverse, comma, slot die, lip, etc.), 2) dipping method, 3) printing method (screen, roll, rotary, gravure, etc.), 4) transfer method, etc. (Transfer), 5) Laminating method, and 6) Spraying method. Among these, the coating method is preferable because the range of the application amount that can be set is large.

  Next, the first panel and the second panel are cut out in a desired shape from the base fabric provided with the air-impermeable treatment agent.

  Thereafter, an adhesive sealing material is disposed by a dispenser or the like in the vicinity of the edge portion of the two cut out panels, and air is included in the inside thereof. At this time, there are several methods. (1) Using a concave or L-shaped discharge hole-shaped base, the adhesive sealing material is arranged in a concave or L shape on each panel, and a hollow adhesive sealing material is formed by joining them. (2) A method of injecting bubbles by injection after arranging (applying) the adhesive sealant by a normal method, (3) A small-diameter nozzle in the large-diameter nozzle 10 as shown in FIGS. 11 or a plurality of them, and a method of disposing air from the small-diameter nozzle while injecting air into the adhesive sealing material. (4) Discharge side of the large-diameter nozzle 10 as shown in FIG. After the coating is applied in a C-shape, the opening is closed by the weight of the sealing material to form a hollow adhesive sealing material.

  Next, the panels are overlapped and bonded together by pressure bonding to form a bag. Finally, after the adhesive sealing material is cured, the airbag is sewn so as to sew the adhesive sealing material portion.

  It is possible to sew the adhesive seal material 1 so as to penetrate the air 2 contained therein, in particular, to reduce the adhesion of the adhesive seal material to the sewing needle, and to end the adhesive seal material, that is, the first panel and the first panel. It is also preferable in that a needle hole is not formed in a portion responsible for joining with the panel 2 and is not damaged. At this time, since the line formed by the encapsulated air 2 can be seen by applying light from below the airbag, it is possible to sew the adhesive sealing material reliably by sewing with this as a mark.

Moreover, the following methods are mentioned as another manufacturing method.
Similarly, a first base fabric and a second base fabric that have been subjected to aeration treatment are prepared, and an adhesive sealing material is arranged in a desired shape by the method described above. The desired shape is a shape in which two base fabrics are joined so that an airbag cut out through a subsequent process becomes a bag as shown in FIG. 5, for example. Next, as described above, the first base fabric and the second base fabric are superposed and bonded by pressure bonding. Finally, the airbag is cut out from the two joined base fabrics.

  By cutting out the airbag after joining as in this method, there is no overlap displacement of the opposing panels, so the dimensional accuracy is excellent and no extra part is required for the base fabric, so when the airbag is folded The volume is reduced and the storage property is excellent. In addition, it is possible to accurately position a bolt hole for attachment to a vehicle or the like, and a predetermined expanded shape can be easily obtained. Furthermore, it is also preferable in that the airbag can be manufactured continuously with a series of apparatuses.

  What is necessary is just to select suitably the sewing thread | yarn used for a sewing from what is generally called as a synthetic fiber sewing thread | yarn, and what is used as an industrial sewing thread | yarn. For example, nylon 6, nylon 66, nylon 46, polyester, polymer polyolefin, fluorine-containing, vinylon, aramid, carbon, glass, steel and the like may be used, and any of spun yarn, filament twisted yarn or filament resin processed yarn may be used.

  The stitching may be performed by stitches that are applied to ordinary airbags such as main stitching, double chain stitching, one-sided stitching, over stitching, safety stitching, staggered stitching, and flat stitching.

  The thickness of the sewing thread is preferably 700 dtex (corresponding to 20th position) to 2800 dtex (corresponding to 0th position), and the number of stitches is preferably 2 to 10 stitches / cm. If multiple rows of stitch lines are required, the distance between the stitch lines may be about 2.2 to 8.0 mm and a multi-needle type sewing machine may be used. If the sewing part distance is not long, one needle You may sew several times with a sewing machine. In the case where a plurality of cut base fabrics are used as the airbag body, the plurality of cut base fabrics may be stacked and stitched one by one or one by one.

  In addition, by designing the adhesive sealant and the bubble layer part to have clearly different light transmittances and light reflectances, it is possible to install a light irradiation device or light transmission device on the sewing machine and detect it with a sensor. It becomes possible to sew more accurately. If the stitching can be accurately performed at an appropriate position, the loss corresponding to the conventional arrangement of the adhesive seal material with an extra width in consideration of the shift can be reduced.

  The airbag of the present invention includes a strap or restraining cloth called a hanging strap or gas flow adjusting cloth on the inner side and a flap on the outer side of the airbag in order to suppress the protrusion of the airbag to the occupant side and control the thickness at the time of inflation. Etc. may be provided.

  Further, depending on the characteristics of the inflator to be used, a heat-resistant protective cloth or a mechanical reinforcing cloth for protecting from the hot gas may be provided around the inflator outlet. These protective cloths and reinforcing cloths may be made of heat-resistant materials such as heat-resistant fiber materials such as wholly aromatic polyamide fibers, wholly aromatic polyester fibers, PBO fibers, polyimide fibers, and fluorine-containing fibers. Alternatively, a fabric separately produced using a thread thicker than the airbag body base fabric may be used. Moreover, you may use what gave the heat resistant coating agent to the fabric.

EXAMPLES Hereinafter, the present invention will be described more specifically based on examples. In addition, the performance evaluation of the airbag currently performed in the Example followed the following method.

(1) Airtightness test Injected pressurized air from the inflator insertion part of the airbag, and after the airbag internal pressure reached 50 kPa, the injection of pressurized air was stopped, and the internal pressure was maintained at 30 kPa after 5 minutes. The case where the internal pressure became less than 30 kPa after 5 minutes was marked as x.

(2) Cost merit Cases where the amount used is less than 20% compared to the case where the adhesive seal material is applied under the same conditions (conditions in which the thickness and width after curing are the same) except that air is not included. Otherwise, it was set as x.

Example 1
Using a nylon 66 filament yarn with a total fineness of 470 dtex, a single yarn fineness of 6.5 dtex, a single yarn strength of 8.5 cN / dtex, and a circular cross-sectional shape, the warp density and the weft density are both 46 / 2.54 cm. A plain fabric was woven using a jet loom. The cover factor was 1885 and the tensile strength was 600 N / cm. This plain fabric was scoured in 90 ° C. hot water containing a surfactant and then heat-set at 185 ° C. for 30 seconds. Subsequently, a two-component addition reaction type solventless silicone rubber composition (viscosity of 15 Pa · s at 25 ° C.) was coated on one side of the woven fabric as a non-air-permeable treatment agent with a knife coater so that the dry weight was 35 g / m ² . Then, heat treatment was performed at 180 ° C. for 2 minutes to obtain a coated fabric with a basis weight of 210 g / m ² .

  The obtained coated fabric was cut into the shape of a side collision airbag shown in FIG. 5 with a laser cutting machine to obtain two panels having the same shape. Next, by the discharge nozzle shown in FIG. 6, a two-component addition reaction type adhesive sealing material (silicone rubber, elongation at break 1400%, hardness 3.5 according to JIS K6251 and viscosity 300 Pa · s at 25 ° C.) and air Were simultaneously discharged onto the coating surface of one panel. The coating length was 7000 mm. Next, another panel was overlaid, pressed to a thickness of 1 mm with a flat plate, taken out, and cured at 25 ° C. for 24 hours. The cured adhesive seal material width 7 was 8 mm, the air layer width 6 was 5 mm, and the thickness 8 of the adhesive seal material was 1 mm. Moreover, air was encapsulated inside the adhesive seal material in the form of bubbles, and the volume of the encapsulated air was 20% based on the calculation. The bubbles included those having a diameter of 0.5 mm or more, and the position of the bubbles could be confirmed by light irradiation from below the airbag. On the air layer width 6, a nylon 400 sewing thread 3 of 1400 dtex was used and stitched by a main stitch at a stitching number of 3.5 stitches / cm to obtain a side airbag. The obtained airbag was deployed without problems, was highly airtight, lightweight, and cost-effective. The evaluation results are shown in Table 1.

Comparative Example 1
An airbag was obtained in the same manner as in Example 1 except that only the adhesive sealant was applied using a normal dispenser. The obtained airbag had a large amount of adhesive seal material to be used, and the cost merit was low. The evaluation results are shown in Table 1.

Comparative Example 2
An airbag was obtained in the same manner as in Comparative Example 1 except that the amount of the adhesive sealant used was 30 cc. Although the weight reduction could be achieved by reducing the applied amount, the thickness of the adhesive sealant after the crimping was reduced to 0.7 mm, and the hermetic performance could not be satisfied. Furthermore, since the width of the adhesive sealing material is narrow, it becomes difficult to sew the adhesive sealing material, and the productivity is lowered.

It is a schematic cross section which shows an example of the junction part of the airbag of this invention. It is the model top view which expanded a part of airbag of this invention. It is a schematic cross section which shows the other example of the junction part of the airbag of this invention. It is the model top view which expanded a part of airbag of this invention. It is a schematic plan view which shows an example of the airbag of this invention. It is a schematic cross section of the nozzle discharge part used when manufacturing the airbag of this invention. It is a schematic cross section of the nozzle discharge part used when manufacturing the airbag of this invention. It is a schematic cross section of the nozzle discharge part used when manufacturing the airbag of this invention. It is a schematic cross section which shows the adhesive seal material after discharge at the time of using the nozzle of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Adhesive sealing material 2 Enclosed air 3 Sewing thread 4 First panel 5 Air bag 6 Air layer width 7 Adhesive sealing material width 8 Adhesive sealing material thickness 10 Large diameter nozzle 11 Small diameter nozzle

Claims (7)

An airbag formed by bonding edges of two panels having an air-permeable treatment agent with an adhesive sealing material, the adhesive sealing material enclosing air, and a sewing portion is provided on the adhesive sealing material. Having airbag. The airbag according to claim 1, wherein the adhesive sealing material is hollow. The airbag according to claim 1, wherein the adhesive sealing material has a plurality of bubbles. A side collision airbag comprising the airbag according to claim 1, 2 or 3. A method of manufacturing an airbag in which edges of a first panel and a second panel are joined to each other with an adhesive sealant, the step of applying an air-impermeable treatment agent to a base fabric, the first from the base fabric A step of cutting out the panel and the second panel, a step of disposing an adhesive seal material in the vicinity of the edges of the cut out first panel and the second panel so that the cross section has a concave shape, the first panel A method for manufacturing an airbag, comprising: joining the second panel and the second panel; and stitching the adhesive seal material. A method of manufacturing an airbag in which edges of a first panel and a second panel are joined to each other with an adhesive sealant, the step of applying an air-impermeable treatment agent to a base fabric, the first from the base fabric A step of cutting out the panel and the second panel, a step of arranging an adhesive sealant in the vicinity of the edge of the cut out first panel and / or the second panel, and injecting air into the adhesive sealant The manufacturing method of an airbag including the process, the process of joining a 1st panel and a 2nd panel, and the process of stitching | sutures on this adhesive sealing material. A method of manufacturing an airbag in which edges of a first panel and a second panel are joined to each other with an adhesive sealant, the step of applying an air-impermeable treatment agent to a base fabric, the first from the base fabric A step of cutting out the panel and the second panel, a step of disposing an adhesive sealant in the vicinity of the edge of the cut out first panel or the second panel while injecting air therein, the first panel A method for manufacturing an airbag, comprising: joining the second panel and the second panel; and stitching the adhesive seal material.

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