JP2008255532A - Base fabric for air bag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lightweight base fabric for an air bag having excellent airtightness with little yarn slippage of a woven fabric, and to provide the air bag made of the base fabric. <P>SOLUTION: The base fabric for the air bag is obtained by forming at least a part thereof according to doup weaving and subjected to coating of at least one surface with a coating material for imparting air impermeability thereto. The air bag is prepared by using the base fabric. Furthermore, the base fabric for the air bag has preferably ≤180 g/m<SP>2</SP>basis weight and ≥400 N slippage resistance. The air bag is further provided. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a base fabric used for an airbag that is practically used as an occupant protection device in the event of an automobile collision. More specifically, the present invention relates to a base fabric for an air bag that is lightweight, excellent in airtightness, and less in fabric misalignment. It is to provide.

  In recent years, airbags have rapidly been installed as occupant safety protection devices for automobiles, and the chest and large size built into the seats for driver protection, passenger seat protection, and side collisions at the time of a frontal collision of a car The number of attachments is increasing, such as for protecting the thigh or for protecting the head mounted in the ceiling above the window so as to expand along the side window. These safety devices (hereinafter referred to as modules) include a gas generator (hereinafter referred to as an inflator) that deploys and inflates an airbag, and a bag airbag that absorbs and relaxes the collision energy of the occupant by contacting the occupant. It consists of many components, such as metal parts that connect them, wiring for electric signal transmission, and resin molded products that cover the upper part of the device so that it can be easily installed in the car, and that also takes design into account. The total weight of each installed module is not small.

  Therefore, efforts are being made to make the components constituting the module lighter and more compact. Of these, an attempt has been made to reduce the weight of the base fabric, that is, the basis weight of the base fabric used for the airbag.

  In order to reduce the weight of the airbag, it has been studied to reduce the fabric weight by using a thin thread for the fabric constituting the airbag body. For example, airbags made from woven fabrics using 470 dtex and 350 dtex thinner than 940 dtex and 700 dtex, which have been conventionally used, have been put into practical use. Further, Patent Document 1 discloses a yarn having a fineness of 200 to 250 d (222 to 278 dtex). An air bag base fabric using the above has been proposed.

  However, fabrics using these thin threads have a lower fabric weight than conventional fabrics using thick threads, but physical properties such as tensile strength and tear strength are reduced, resulting in thinner fabrics. There was a tendency that the seam misalignment of the sewn portion was likely to occur. In particular, in the case of an inflator with a high gas temperature, the hole in the sewing part is enlarged by the sewing thread, and when the hot gas escapes from the enlarged hole, the periphery of the seam becomes soft and melts easily. May continue and melt breakage of the sewn part may occur.

  Therefore, in Patent Document 2, a yarn having a strength of 210 d (235 dtex) or less, preferably 10 g / d (8.85 cN / dtex) or more is used for warp and weft, and the strength of the yarn is reflected in the fabric strength. There is a proposal on a base fabric for an air bag made of Oxford woven which is easy to make. As described in the specification of the publication, the Oxford weave is obtained by weaving two or more warps and wefts to form a plain woven fabric. One warp and one weft Compared to ordinary plain woven fabrics using woven fabrics, the fabric strength is more easily expressed, but the fabric structure is less dense than plain woven fabrics and the base fabric surface is not coated with a coating material. As a result, it is difficult to obtain low air permeability and the seam of the sewn portion tends to be large.

On the other hand, Patent Document 3 discloses a composite sheet obtained by laminating a warp knitted fabric using a thin thread and a nonwoven fabric. According to the example of the publication, although a yarn such as 210d (235 dtex) or 70 d (78 dtex) is used for the warp knitted fabric, a non-woven fabric with a basis weight of 50 g / m ² is inserted, but the air permeability is low. In addition, the basis weight and thickness of the base fabric are increased, and it is not possible to obtain a base fabric which is the object of the present invention and is light, excellent in airtightness, and less in fabric misalignment.

Patent Document 4 proposes a method of increasing the bursting strength of an airbag by specifying a cover factor, reducing the amount of residual oil agent attached, and increasing the slipping resistance of yarn from a fabric. Although there are descriptions such as plain weave, mat weave, twill weave, and ripstop weave as a base fabric for airbags, a method for providing a lightweight bag is not suggested, and is described in the examples. The basis weight of the base fabric also exceeds 180 g / m ² , and the object of the present invention cannot be achieved.

JP 2000-153743 A JP-A-6-33336 JP-A-5-319195 JP-A-8-2395

  The present invention proposes an air bag base fabric that is lighter than conventional base fabrics used as airbag base fabrics, has excellent airtightness, and has little fabric misalignment. It is possible to provide a base fabric having excellent characteristics that cannot be obtained by the prior art.

  Unlike the plain woven fabrics conventionally used for airbag fabrics, the present invention is a woven fabric formed from a calami weave that has little fabric misalignment even if the fabric density is low.

That is, the present invention
(1) A base fabric made of a woven fabric, at least a part of which is formed of calami weave, and at least one surface of the base fabric is provided with a covering material for imparting air permeability. Airbag fabric,
(2) The airbag fabric according to the above (1), wherein the Karami weave is composed of any one or two of woven weave, woven weave and raori.
(3) The basis weight of the base fabric is 180 g / m ² or less, and the sliding resistance of the yarn from the woven fabric specified by ASTM D6479 is 400 N or more, as described in (1) and (2) above Airbag fabric,
(4) The airbag fabric according to (1) to (3) above, wherein the warp of the woven fabric and / or the thickness of the weft yarn is 200 to 800 dtex,
(5) It is related with the airbag characterized by using the base fabric in any one of said (1)-(4).

  ADVANTAGE OF THE INVENTION According to this invention, the base fabric which is light and excellent in airtightness, and has few structure | tissue shift | offset | difference of a textile fabric, and the seam gap | separation of a sewing part can be provided.

  In the present invention, it is important that at least a part of the structure of the woven fabric that is the base fabric is a calami weave (also referred to as a twisted weave). So far, the fabric structure used for air bag base fabrics is mainly plain weave, and each is composed of warps and wefts crossing each other above or below each other. . In order to lower the basis weight of the base fabric, it has been practiced to reduce the thread used or to lower the weave density. According to this technique, the basis weight of the base fabric decreases as the yarn to be used becomes thinner and the weave density decreases even with the same thickness yarn. Misalignment, seam misalignment of the sewn part, etc. become large, and practicality as an airbag is insufficient. That is, the plain weave can obtain a very dense structure when the weave density is high, but if the weave density is low, it becomes difficult to suppress the warp and weft structure deviation due to external force.

  On the other hand, the calami weave used in the present invention is known for thin fabrics such as those for kimonos (summer kimonos, monk clothes, ornaments, etc.), and two adjacent warps are shifted left and right. The woven structure is formed so as to intersect planarly and the wefts pass through the intersecting portion. Therefore, even when the weaving density is low, the texture shift is small and a firm fabric can be obtained. The calami fabrics produced for clothing use thin yarns and have a rough structure and a high air permeability, but have low physical properties and are not suitable for industrial use.

  According to the present invention, it has been found for the first time that a base fabric for an air bag can be obtained by using a yarn having a thickness used for an air bag, even when the fabric density is relatively low even when the weave density is relatively low.

  Karami weaves of the present invention include silk weaves, silk weaves, and rafts. 1 to 3 show schematic views of respective representative fabric structures. A woven fabric (FIG. 1) is a woven fabric in which two warps form a pair, one warp swings to the left and right of the other warp, and intersects every weft, and the weft passes through the intersection. A woven structure is formed in the form. The warp weave (Fig. 2) is a set of two warps, one of which intersects with the other every three, five or seven wefts. Organization. In addition, Raori (Fig. 3) consists of a pair of three or more odd warps that are entangled with each other to form a mesh-like structure. It is in a place where it intersects with the warp alternately. These fabrics are woven using special folds different from those used for weaving ordinary plain weaves. These calami weaves may be used as a pattern on a part of the plain weave or may be arranged alternately with the plain weave.

  The base fabric for airbags according to the present invention needs to be coated on at least one surface of the base fabric in order to ensure high airtightness, that is, air permeability.

When a coating material is applied, a material having an application amount of 15 g / m ² or more or a thickness of 15 μm or more may be used on at least one surface. The covering material may be any material that is normally used for a base fabric for airbags, as long as it satisfies heat resistance, wear resistance, adhesion to the base fabric, flame retardancy, non-adhesiveness, etc. It ’s fine. For example, 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-based resin or rubber, polyamide-based resin, epoxy-based resin, vinyl One kind or two or more kinds of resin, urea resin, phenol resin, etc. may be used.

  The coating material is applied by 1) coating method (knife, kiss, reverse, comma, slot die, lip, etc.), 2) dipping method, 3) printing method (screen, roll, rotary, gravure, etc.), 4 Processing methods such as a transfer method (transfer) and a laminating method may be used.

  In addition to the main material for the covering material, various additives usually used for improving processability, adhesiveness, surface characteristics or durability, such as a crosslinking agent, an adhesion-imparting agent, a reaction accelerator, Reaction delay crime, heat stabilizer, antioxidant, light stabilizer, anti-aging agent, lubricant, smoothing agent, anti-blocking agent, pigment, water repellent, oil repellent, concealing agent such as titanium oxide, gloss imparting agent, You may select and mix 1 type, or 2 or more types, such as a flame retardant and a plasticizer.

  The properties of the coating material as a liquid include a solvent-free type, a solvent type, a water dispersion type, a water emulsification type, depending on the application method, the coating amount, the processability and stability of the resin, the properties required for the coating material, etc. What is necessary is just to select suitably from a water-soluble type | mold.

  The covering material may be interposed in any of the surface of at least one surface of the base fabric, the gap portion of the yarn bundle constituting the base fabric, or the gap portion of the single fiber yarn.

  In addition, various pretreatment agents for improving adhesion to the base fabric, adhesion improvers, etc. may be added to the covering material, or pretreatment such as primer treatment may be applied to the surface of the base fabric in advance. . Furthermore, in order to improve the physical properties of the coating material, or to impart heat resistance, anti-aging properties, oxidation resistance, etc., after applying the coating material to the woven fabric, drying, crosslinking, vulcanization, etc. are treated with hot air , Pressure heat treatment, high energy treatment (high frequency, electron beam, ultraviolet ray, etc.) may be used.

In the present invention, the basis weight of the base fabric is 180 g / m ² or less, preferably 160 g / m ² or less, and the slip resistance from the fabric structure of the yarn constituting the fabric is 400 N or more, preferably 450 N or more. Is preferable for clarifying the effects of the present invention.

If the basis weight of the base fabric exceeds 180 g / m ² , it is difficult to obtain a lightweight airbag. Here, the basis weight of the base fabric refers to the weight in a non-coated state before the coating material is applied.

  Further, when the sliding resistance is less than 450 N, the yarn is liable to slip from the fabric structure, and the seam misalignment of the airbag sewn portion tends to increase, and the sewn portion is likely to be damaged. Here, the slip resistance is the average value of warp and weft.

  The warp yarn and / or the weft yarn constituting the woven fabric of the present invention may be of a thickness, a cross-sectional shape, and an outer surface layer state that do not cause a problem in producing a calami weave. For example, the yarn thickness ( Setting the total fineness) to 200 to 800 dtex, preferably 300 to 700 dtex is preferable for increasing the strength and density of the base fabric. Conventionally known thin yarns of less than 200 dtex for clothing are difficult to satisfy the physical characteristics required for airbag applications, and it is difficult to lighten the base fabric weight with thick yarns exceeding 800 dtex. The fineness of one single yarn is preferably in the range of 0.5 to 6 dtex. The yarn strength may be 7 cN / dtex or more, preferably 8 cN / dtex or more. Further, the cross-sectional shape of the single yarn may be any of circular, oval, flat, polygonal, 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.

  It is preferable that at least one surface of the base fabric of the present invention is provided with a coating material for imparting air permeability to improve airtightness.

  The calami weave used in the present invention is originally a structure having a low weave density, and warp yarns are crossed in order to suppress structural displacement, but in order to ensure airtightness as a base fabric for airbags used in this application. It is preferable to make the fabric structure as dense as possible. In some cases, film-form, non-woven-form, mesh-form, powder-form, solution-form hot-melt materials, adhesive materials, adhesive materials, etc. are used to improve adhesion to the coating material and to suppress structural displacement. It may be applied to the surface of the base fabric.

  For example, in order to obtain a dense fabric structure, the cover factor may be 650 or more, preferably 750 or more. Here, the cover factor CF, which is a parameter representing the density of the woven fabric structure, is determined by the product of the respective weave densities N (lines / cm) and thickness D (dtex) of the warp and weft. expressed.

  The airbag fabric used in the present invention can be manufactured by a loom equipped with a kite capable of knitting (calami kite, yarn kite, etc.) and a dobby device capable of opening warps. And a shuttle loom, a water jet loom, an air jet loom, a rapier loom, and a projectile loom.

  Further, the material of the fiber yarn constituting the airbag fabric of the present invention is not particularly limited, such as natural fiber, chemical fiber, inorganic fiber, etc., but synthetic fiber filament is versatile, From the viewpoints of the production process 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 , Cellulose fiber, silicon carbide fiber, alumina fiber, glass fiber, carbon fiber, steel fiber, etc., one or more may be selected as appropriate. Physical properties, durability, heat resistance In view of the above, it is preferable to use nylon 66 fiber. From the viewpoint of recycling, polyester fibers and nylon 6 fibers are also preferable.

  In these fiber yarns, various additives usually used for improving spinnability, workability, durability, etc., 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. Further, when it is desirable for weaving the calami weave, or when the base fabric characteristics are improved, processing such as twisting, bulking, crimping, winding, or gluing may be performed. Furthermore, as the form of the yarn, in addition to the long fiber filament, a spun yarn of a short fiber, a composite yarn thereof, or a thin tape-like yarn obtained by slitting a nonwoven fabric or a film in some cases may be used.

  The specification, shape, and capacity of the airbag according to the present invention may be selected in accordance with the site to be arranged, application, storage space, occupant impact absorption performance, inflator output, and the like.

  In addition, in order to absorb energy when an occupant comes into contact with the airbag, one or a plurality of exhaust holes, for example, a circle having a diameter of 10 mm to 80 mm or a hole with an equivalent area, or a slit or membrane corresponding to these exhaust performances A valve or the like may be provided, and a reinforcing cloth may be joined and laminated around the exhaust part. Furthermore, in order to suppress the protrusion of the airbag to the occupant side and to control the thickness during inflation, a strap, gas flow adjusting cloth on the inside of the airbag, or a belt-like cloth called a flap on the outside of the airbag is suppressed. A cloth or the like may be provided.

  The number of the cut base fabrics constituting the airbag body may be one or a plurality, and the joint portion of the airbag, for example, the outer peripheral portion, the fixing of the reinforcing fabric or the hanging strap, etc. can be sewn, bonded, welded, Any method such as weaving, knitting, or a combination thereof may be used as long as it satisfies the robustness as an airbag, the impact resistance at the time of deployment, and the impact absorption performance of the occupant. For example, when joining the joints by stitching, it can be done with seams that are applied to normal airbags, such as main stitching, double chain stitching, one-sided stitching, overlock stitching, safety stitching, staggered stitching, flat stitching, etc. Good. The thickness of the sewing thread may be 700 dtex (equivalent to 20th) to 2800 dtex (equivalent to 0th), and the number of stitches may be 2 to 10 stitches / cm. When multiple rows of stitch lines are required, the distance between the stitch lines should be about 2.2 mm to 8 mm, and a multi-needle type sewing machine should be used. If the sewing part distance is not long, a single needle sewing machine should be used. Multiple stitches may be sutured. When a plurality of cut base fabrics are used as the airbag body, the plurality of sheets may be stitched together or stitched one by one.

  In some cases, a sealant, adhesive, adhesive, etc. is applied to the upper and / or lower part of the seam, between the seams, the seam allowance part, etc., in order to prevent gas leakage from the seam from the outer peripheral stitching part, etc. You may spread and laminate.

  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, polyester, polymer polyolefin, There are fluorine, vinylon, aramid, carbon, glass, steel, etc., and any of spun yarn, filament twisted yarn, and filament resin processed yarn may be used.

  Further, depending on the characteristics of the inflator 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 are 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, it is possible to use a woven fabric that is separately prepared using a thread that is the same as the airbag main body or thicker than the main body base fabric, or a fabric obtained by applying a heat resistant coating material to the woven fabric.

  The folding method for storing airbags is also the same as the driver's seat bag, left and right from the center, vertically folding folding from the center, folding folded from multiple directions toward the center, roll folding like a passenger seat bag, bellows Folding may be performed by folding, folding screen-like zigzag folding, a combination thereof, or alligator folding such as a side bag with a built-in seat.

  The present invention relates to a woven fabric having a woven structure different from that of a conventional airbag base fabric, and has a low fabric weight, a fabric fabric misalignment, a seam misalignment of a sewing portion, and an air bag using the fabric. Various types of occupant protection bags, for example, frontal collision protection for driver and passenger seats, side bags for side collision protection, rear seat protection, headrest bags for rear-end collision protection, legs・ Functions in addition to knee bags and foot bags for foot protection, mini bags for child protection (child seats), bags for air belts, passenger cars for pedestrian protection, commercial vehicles, buses, motorcycles, etc. If it is satisfied with the above, it may be applied to various uses such as ships, trains / trains, airplanes, and amusement park facilities.

Hereinafter, the present invention will be described more specifically based on examples. In addition, the base fabric for airbags performed in the Example and the method of performance evaluation of airbag characteristics are shown below.
(1) Fabric weight of base fabric
The mass per unit area of the base fabric was determined by the method specified in 8.4.2 of JIS L-1096.
(2) Sliding resistance force With respect to the slipping resistance of the yarn from the fabric specified in ASTM D6479, N = 3 was measured from the warp direction and the weft direction of the base fabric, and the total average value of these values was determined. It was.
(3) Bag deployment test The airbag deployment test was performed by assembling a module using an inflator (model ZA, 2-stage type, output 160 kpa / 220 kpa) manufactured by Daicel, a fixing bracket, and a resin case. The module was preheated at 100 degrees for about 5 hours, and then a deployment test was performed to observe the state of the airbag outer periphery sewn portion after deployment.

  The method for creating the driver's seat airbag used for the evaluation is shown below.

Two circular body panels having an outer diameter of φ690 mm are cut from a fabric prepared as a base fabric for an airbag, and an inflator attachment port of φ67 mm is formed at one center of the main body panel, and an obliquely upward 45 from the center of the attachment port. Exhaust holes φ30 mm were opened at two locations (a pair of left and right) at a position of 120 mm on the line. Further, as a reinforcing fabric, 35 g / m ² of silicone resin was applied to a non-coated base fabric having a weaving density of 21 / cm and a base fabric having a weaving density of 18 / cm and made using 470 dtex of nylon 66 fiber. The obtained coated base fabric was prepared. As the reinforcing cloth for the inflator attachment port, three pieces of the annular cloth A having an outer diameter of 210 mm and an inner diameter of 67 mm were cut from the non-coated base cloth and one from the coated base cloth. Further, two annular cloths B having an outer diameter of 90 mm and an inner diameter of 30 mm were cut from the coated base cloth as exhaust hole reinforcing cloths. Three non-coated annular fabrics A are overlapped on the inflator attachment port, sewn in a circle at positions of φ126 mm and φ188 mm from the inside, and one coated annular fabric A of the same shape is superimposed thereon, and four sheets at the position of φ75 mm An annular reinforcing cloth was sewn into a circular shape on the main body base cloth. In addition, one annular cloth B was superimposed on each exhaust hole and sewn to the main body panel. The reinforcing cloths of the annular cloth A and the annular cloth B were overlapped so as to be shifted by 45 degrees from the thread axis of the main body panel to be sewn together. Around the inflator attachment port, bolt holes of φ5.5 mm were provided in four places at a distance of 68 mm between the holes at positions parallel to the thread axis of the main body panel. To sew the annular reinforcing fabrics A and B onto the main body panel, the upper thread is the 5th thread (equivalent to 1400 dtex) and the lower thread is the 8th thread (equivalent to 940 dtex). Performed by sewing. In addition, the two main panels are overlapped with the surface to which the annular cloth replenishment cloth is sewed being shifted by shifting the thread axis of the panel by 45 degrees, and the outer periphery of the two main panels is 2.4 mm between the stitch lines and the seam allowance is 20 mm. A circular airbag having an inner diameter of 650 mm was created by sewing with two rows of double ring stitches. The same sewing thread combination as the above-described main sewing was used as the sewing thread for the outer periphery sewing.

[Example 1]
Nylon 66 fiber 235 dtex / 72f (yarn strength 8.4 cN / dtex) for the warp, and nylon 66 fiber 470 dtex / 140 f (yarn strength 8.6 cN / dtex) for the weft, A cocoon woven fabric, which is a type of calami weave, was prepared, followed by scouring and setting, 30 g / m ^{2 of} solventless silicone resin was applied, and heat treatment was performed at 180 ° C. for 1 minute to obtain a coated base fabric. The resulting base fabric had a weaving density of 28 warps / cm and wefts of 16 / cm. While evaluating the fabric weight of a base fabric and sliding resistance, the expansion | deployment test of the airbag was performed by the above-mentioned method, and the condition of the outer peripheral part after expansion | deployment was observed.

  As shown in Table 1, the obtained base fabric was lightweight and had high slip resistance, and there was no problem in the outer periphery of the airbag after deployment.

[Example 2]
As a base fabric for airbags, 350 dtex / 108f (yarn strength 8.6 cN / dtex) is used for warp, and a cocoon woven fabric (three flat cocoons), which is a type of calami weave, is prepared, and the amount of solvent-free silicone resin applied A base fabric was prepared in the same manner as in Example 1 except that the amount was 25 g / m ² . The resulting base fabric had a weave density of 24 warps / cm and 16 wefts / cm. As shown in Table 1, the basis weight of the base fabric was low, the slip resistance was high, and there was no problem in the outer peripheral portion after deployment.

[Comparative Example 1]
As the base fabric for the airbag, 350 dtex / 108f of nylon 66 fiber is used for both the warp and the weft, the coating amount of the solventless ricone resin is 35 g / m ² , and the weave density is 22.5 / A plain woven coated base fabric of cm was made. Although the basis weight of the obtained base fabric was light, the slip resistance was low, and the seam opening of the outer peripheral portion of the airbag after deployment was large.

[Comparative Example 2]
As a base fabric for airbags, 470 dtex / 140f of nylon 66 fiber is used for both warp and weft, scouring and setting are performed, and a plain woven uncoated base fabric with a weaving density of both warp and weft is 21 / cm. did. The sliding resistance of the obtained base fabric is large, and there is no problem in the outer peripheral portion of the airbag after deployment. However, the basis weight of the base fabric is large, and the light airbag intended by the present invention cannot be obtained.

It shows an example of the present invention and is a schematic view of a woven fabric structure. 1 shows an example of the present invention, and is a schematic diagram of a woven fabric structure of a knot weave called three flat warps where warps intersect every three wefts. It shows an example of the present invention and is a schematic diagram of a woven fabric structure.

Explanation of symbols

1A, 1B, 11A, 11B, 21A, 21B ... Woven yarn for fabric 2, 12A, 12B, 12C, 22 ... ... Weft for fabric

Claims (5)

A base fabric made of woven fabric, at least a part of which is formed of calami weave, and a covering material for imparting air permeability to at least one surface of the base fabric is applied. Base fabric. The base fabric for an air bag according to claim 1, wherein the calami weave is composed of any one or two of a kori weave, a kori weave, and a loom. The base fabric for an air bag according to claim 1 or 2, wherein the basis weight of the base fabric is 180 g / m ² or less, and the sliding resistance of the yarn from the fabric structure defined by ASTM D6479 is 400 N or more. The base fabric for an airbag according to any one of claims 1 to 3, wherein the warp and / or the weft of the woven fabric has a thickness of 200 to 800 dtex. An air bag comprising the base fabric according to any one of claims 1 to 4.

Images