JP2010018901A - Base fabric for airbag and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a base fabric for an airbag wherein the sliding down resistance of a light-weight yarn constituting the base fabric is high, and stitch deviation of a sewn portion and fraying from a cut line are little. <P>SOLUTION: The base fabric for the airbag is a woven fabric formed from a synthetic fiber, and obtained by carrying out the union weaving of a fiber having a melting point 50°C or more lower than that of the synthetic fiber used for the basic material in a mixed proportion of 0.5-5.0% by weight with one or both of warp yarns 1 and weft yarns 2 on a loom, and heat-treating the resultant woven product after the weaving at a temperature higher than the melting point of the low-temperature fiber. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a base fabric used in an airbag that is practically used as an occupant protection device at the time of an automobile collision and a method for manufacturing the same, and more specifically, is lightweight and has high slip resistance of the yarn constituting the base fabric, The present invention provides a base fabric for an air bag that is less likely to become dislodged from misalignment and cutting lines of a sewing portion, and a method for manufacturing the same.

  In recent years, the installation of airbags as an automobile occupant safety protection device has progressed rapidly, for protecting drivers during frontal collisions of automobiles, airbags for protecting passengers, and for side collisions built into seats. The number of wearing airbags for protecting the chest, thighs, and lower back, or for protecting the head at the time of a side collision that is installed in the ceiling of the upper part of the window so as to be deployed along the side window is increasing. .

  These safety protection devices (hereinafter referred to as modules) include gas generators (hereinafter referred to as inflators) that deploy and inflate airbags, and air bags that absorb and mitigate the collision energy of passengers by abutting the passengers. It consists of many components such as bags, 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 also take design into account. The total weight of each module installed in the is not small.

  Therefore, efforts are being made to make the components constituting the module lighter and more compact. Among these, in order to reduce the weight of the airbag, it has been studied to reduce the weight of the fabric by using a thin thread for the fabric constituting the airbag body, for example, the fabric.

  For example, an air bag made from a woven fabric using a 470 dtex or 350 dtex yarn thinner than a conventionally used 940 dtex or 700 dtex yarn has been put into practical use. Has proposed a fabric for an airbag using yarns having a fineness of 200 to 250 d (222 to 278 dtex).

  However, the fabrics using these thin threads are lighter than the conventional fabrics using thick threads, but the physical properties such as tensile strength and tearing strength are reduced and the fabric becomes thinner. As a result, misalignment of the sewing part, fraying at the time of cutting, and misalignment of the fabric at the time of processing tend to occur easily. 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, an attempt has been made to suppress the occurrence of fraying at the time of cutting the fabric. For example, in Patent Document 2 (JP-A-6-286547), a low-melting yarn is woven into one or both of warp and weft at an appropriate interval and heated at a temperature at which the low-melting yarn is melted. Discloses a method of fusing to a high melting point yarn.

  However, this proposal is limited to the flaking at the time of cutting, and there is a possibility that the strength characteristics may be impaired by using the low melting point yarn as a part of the basic assembly material. In addition, there are few references to the interweaving interval, and by making the interval fine, the base fabric may be cured and the storage property may be deteriorated.

  Further, Patent Document 3 (Japanese Patent Laid-Open No. 10-266040) discloses that a high-melting fiber and a low-melting fiber are mixed or twisted into at least a part of the warp and / or the weft of a non-coated airbag fabric made of synthetic fibers. A method is disclosed in which a set yarn is heat-set at a temperature equal to or higher than the melting point of the low-melting fiber after weaving.

The proposals in this document are also limited to misalignment at the time of processing and fraying at the time of cutting, and in the manufacturing process, it is necessary to use twisted or combined yarn, both of which increase the number of processes. It will lack economic efficiency. In addition, in the case of twisting, the change in performance due to twisting added to the yarn constituting the basic assembly cannot be overlooked. Further, in the case of the combined yarn, because of its form, it lacks stability at the time of production and significantly impairs productivity.
JP 2000-153743 A JP-A-6-286547 Japanese Patent Laid-Open No. 10-266040

  The present invention is a fabric structure that is lighter than a conventional base fabric used as a base fabric for an air bag and is a general specification of a lightweight base fabric. The present invention proposes a base fabric for an air bag and a method for producing the same, which is high and has less misalignment at the sewing portion and at the time of cutting, and a base fabric having excellent characteristics that cannot be obtained by the prior art described above. An airbag using a base fabric is provided.

  The present invention seeks as a base fabric for an air bag while being lightweight, by interweaving a fiber having a melting point lower than that of a synthetic fiber used for a basic assembly in at least one of the warp and the weft of the base fabric used in the airbag. Provided is a base fabric that has excellent physical properties and solves the above problems.

  That is, the present invention is an air bag base fabric made of a woven fabric of synthetic fibers, and has a melting point of 50 ° C. or more lower than that of the synthetic fibers used in the basic assembly for either or both of the warp and the weft. The fibers are interwoven on a loom at a weight mixing ratio of 0.5 to 5.0%, and heat treated at a temperature higher than the melting point of the low-melting fiber after weaving.

  In the airbag fabric, it is preferable that the yarn of the low melting point fiber is woven in the same opening as the yarn of the basic assembly material.

  Further, according to the present invention, as the warp and / or weft, a plurality of yarns of the basic assembly and one yarn of the low melting fiber are used as a repeating unit, and the yarn of the low melting fiber is the basic assembly. It shall be arranged for each of a plurality of yarns.

  Furthermore, the present invention relates to a method for producing a base fabric for an air bag comprising a woven fabric of synthetic fibers, wherein either one or both of the warp and the weft is a synthetic fiber used for the yarn of the basic assembly. A yarn having a low melting point of 50 ° C. or more is woven with a yarn of the basic assembly material on a loom at a weight mixing ratio of 0.5 to 5.0%, and after weaving, the melting point is higher than the melting point of the low melting point fiber. The heat treatment is performed at a temperature.

  Further, the present invention provides a method for producing the airbag fabric according to the present invention, wherein warp yarns and / or weft yarns include a plurality of yarns of the basic assembly material and one yarn of the low melting point fiber as a repeating unit. The yarn of the low melting point fiber is interwoven at the same opening with the yarn of the basic assembly material for every plurality of yarns of the basic assembly material.

  As described above, according to the present invention, the air that is lightweight, has excellent sliding resistance, has little slippage from the misalignment and cutting line of the sewing portion, and does not impair physical properties such as strength and storage performance. A base fabric for a bag can be provided, and a lightweight airbag using the base fabric can also be provided.

  The present invention is a woven fabric for an airbag made of a synthetic fiber. In the airbag fabric, the melting point is higher than that of a synthetic fiber used for a yarn of a basic assembly material for warp and / or weft constituting the woven fabric. However, it is important to weave fibers having a temperature of 50 ° C. or more (also referred to as low melting point fibers) at a weight mixing ratio of 0.5 to 5.0%. The base fabric thus woven is heat-treated at a temperature equal to or higher than the melting point of the low-melting fiber, and only the low-melting fiber is melted so that the two are heat-bonded at the warp or weft and the crossing point of the fabric. It is possible to increase the resistance to the defrosting action from the tissue.

  In the yarn of the low melting point fiber constituting the airbag fabric of the present invention, the synthetic fiber filament is versatile and is preferable from the viewpoint of the manufacturing process of the fabric and the physical properties of the fabric. For example, a polyamide-based multicomponent copolymer fiber, a polyester-based multicomponent copolymer fiber, a polyolefin-based copolymer fiber, a polyvinyl alcohol-based copolymer fiber, a polyurethane-based copolymer fiber, or the like may be appropriately selected. It is preferable in terms of performance.

  These fiber yarns have various additives usually used to improve spinnability, workability, durability, etc., for example, heat stabilizer, antioxidant, light stabilizer, anti-aging agent, lubrication One or two or more of an agent, 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.

  The thickness of the yarn of these low melting point fibers needs to be 20 dtex or more, preferably 50 dtex or more. If it is less than 20 dtex, the slip resistance due to the crossing point adhesion of the high melting point fibers cannot be sufficiently improved. There is a case. The upper limit of the yarn thickness of the low-melting fiber may be selected depending on the properties and properties of the obtained base fabric, but is preferably 300 dtex or less, more preferably 170 dtex or less for obtaining a flexible base fabric. More preferred.

  The melting point of these low-melting fibers is preferably 50 ° C. or more lower than the melting point of the fibers used for the yarn forming the basic assembly. More preferably, it is preferably 100 ° C. or lower. When the difference in melting point is less than 50 ° C., the yarn of the basic assembly may be melted by heat treatment. In addition, since the temperature of the heat treatment is slightly higher than the melting point of the low-melting fiber, a long time is required to completely melt the fiber.

  Synthetic fiber filaments are also versatile for the yarns of the basic assembly fibers constituting the airbag fabric of the present invention, and are preferred from the standpoints of the fabric manufacturing process and fabric properties. 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.

  For the yarns of these basic assemblies, various additives usually used for improving spinnability, workability, durability, etc., for example, heat stabilizers, antioxidants, light stabilizers. , Anti-aging agents, lubricants, smoothing agents, pigments, water repellents, oil repellents, masking agents such as titanium oxide, gloss imparting agents, flame retardants, plasticizers and the like may be used. Further, when it is desirable to weave the calami weave, processing such as twisting, bulking, crimping, winding, gluing, etc. may be performed. Further, 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 the like may be used.

  The thickness of the fiber yarn used for these basic assemblies needs to be 200 dtex or more, preferably 230 dtex or more, and if it is less than 200 dtex, the mechanical properties required for the airbag may not be sufficiently satisfied. is there. The upper limit of the thickness of the fiber yarn of the basic assembly material may be selected depending on the characteristics and properties of the obtained base fabric, but is preferably 1000 dtex or less and more preferably 500 dtex or less for obtaining a lightweight base fabric. Is more preferable.

  In the present invention, it is particularly preferable from the viewpoints of physical properties, durability, heat resistance, and the like that both the yarn fibers and the low melting point fibers of the basic assembly are nylon polymers.

  In the present invention, weaving is preferably performed with a low-melting fiber weight mixing ratio of 0.5 to 5.0% in the yarn constituting one or both of the warp and weft of the airbag fabric. More preferably, weaving at 1.5 to 3.0% is particularly preferable. If the weight mixing ratio is less than 0.5%, the effect of reducing the misalignment of the sewing portion may be reduced. On the other hand, when the weight mixing ratio is more than 5%, the flexibility of the base fabric itself may be impaired and the storage property may be lowered.

  In the present invention, the low melting point fibers are preferably interwoven at the same time as the yarns of the basic assembly material with the yarns of the low melting point fibers during weaving. In the case of twisted yarn or yarn, increasing the number of processes results in lack of economic efficiency. In addition, in the case of twisting, the change in performance due to twisting added to the yarn constituting the basic assembly cannot be overlooked. Further, in the case of the combined yarn, the yarn of the low melting point fiber and the yarn of the basic assembly in the same array are irregularly twisted during weaving, and the performance becomes unstable. In addition, it lacks stability during production and significantly impairs productivity. In the case where the opening is not the same, the basic assembly is not the target structure after melting, so that a change in performance cannot be overlooked.

  Therefore, when weaving a base fabric for an airbag, as a warp and / or weft, a plurality of yarns of the basic assembly and one yarn of the low melting point fiber are used as a repeating unit, and the yarn of the basic assembly For each of a plurality of strips, the yarn of the low melting point fiber is interwoven at the same opening as the yarn of the basic assembly material, without the twist form at the time of weaving, the weight mixing ratio within the above range, and This is particularly preferable in order not to impair physical properties such as strength and storage properties.

  The base fabric of the present invention is preferably a plain weave in order to ensure the denseness of the woven structure, the physical properties and the uniformity of the performance, but the weave weave (basket weave), lattice weave (ripstop weave), twill weave, and weave weave. , Woven fabric, imitation weave, or a composite structure thereof may be used. In some cases, in addition to the biaxial axes of warp and weft, a multi-axis design including an angle of 60 degrees may be used, and the arrangement of the threads in that case may be the same as that of the warp or weft.

  Production of the airbag fabric used in the present invention may be appropriately selected from various looms used for weaving ordinary industrial fabrics, such as shuttle looms, water jet looms, air jet looms, rapier looms. And a projectile loom.

In the present invention, in order to ensure airtightness, it is preferable to apply a coating material to at least one side of the base fabric by air-impermeable processing. For example, a material having a coating amount of 10 g / m ² or more or a thickness of 10 μ or more is applied to one side of the base fabric. Should be used. 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 coating amount, the coating method, the workability and stability of the material, 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 fabric, drying, crosslinking, vulcanization, etc. are performed with hot air treatment, The heat treatment may be performed by pressure heat treatment, high energy treatment (high frequency, electron beam, ultraviolet ray, or the like).

  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 when inflated, a strap, gas flow adjustment cloth on the inside of the airbag, or a belt-like cloth called a flap on the outside of the airbag, a restraining cloth, etc. It 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 cloth or the hanging strap, etc. may 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, over 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 configuration different from that of a conventional airbag base fabric, having a low basis weight, and having less misalignment of the sewing portion of the fabric, less misalignment of the fabric, and an airbag using the base fabric Various occupant protection bags, for example, frontal collision protection for driver and passenger seats, sidebags for side collision protection, rear seat protection, headrest bags for rear-end collision protection, legs, 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. As long as it is satisfactory, it may be applied to various uses such as ships, trains / trains, airplanes, amusement park facilities, or clothing and other industrial materials.

  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) Sliding resistance
According to the method prescribed in ASTM D6479, the slip resistance of the yarn from the woven fabric was measured at n = 3 from the warp direction and the weft direction, and the total average value of these was calculated as the slip resistance (N).

(2) Airbag deployment test and state of seam after deployment The airbag deployment test was conducted using a Daicel inflator (model ZA, 2-stage type, output 160 kpa / 220 kpa), fixing bracket, and resin case. The module was assembled and implemented. The module was preheated at 100 degrees for about 5 hours, and then a deployment test was conducted to observe the airbag inflated state during deployment and the state of the airbag outer periphery sewn portion after deployment.

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

Two circular main body panels having an outer diameter of φ690 mm are cut from a fabric prepared as an airbag base fabric, and an inflator attachment port of φ67 mm is formed at the center of one main body panel, and obliquely upward 45 from the center of the attachment port. Exhaust holes with a diameter of 30 mm were opened at two positions (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 a reinforcing cloth for the inflator attachment port, three first annular cloths 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, as the exhaust hole reinforcing cloth, two second annular cloths having an outer diameter of 90 mm and an inner diameter of 30 mm were cut from the coated base cloth.

  Then, the first annular cloth of the three non-coated base fabrics is overlapped on the inflator attachment port, is sewn in a circle at positions of φ126 mm and φ188 mm from the inside, and the first shape of the coat base fabric of the same shape is formed thereon. One annular cloth was overlapped, and four reinforcing cloths of the first annular cloth were sewn to the main body panel in a circular shape at a position of φ75 mm. In addition, one second annular cloth of the coat base cloth was superposed on each exhaust hole and sewn to the main body panel. The reinforcing cloths of the first annular cloth and the second annular cloth 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 reinforcing fabric to the main body panel using an annular fabric, the upper thread is the 5th thread (equivalent to 1400 dtex) and the lower thread is the 8th thread (equivalent to 940 dtex). It went by. In addition, the two main panels are overlapped by stitching the surfaces to which the reinforcing cloth made of the annular cloth is sewn, with the thread axis of the panel being shifted by 45 degrees, and the outer periphery of the two main panels is 2.4 mm between the seam 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.

  The behavior at the time of deployment of the airbag under the above conditions and the state of the seam portion of the outer peripheral seam after deployment were determined with the naked eye.

(3) Storability The air bag similar to (2) was folded in the same shape as when modularized, and the thickness when a load of 2 kgf was applied was confirmed and judged.

[Example 1]
Both warp and weft are nylon fiber yarns, 470 dtex / 136 f (melting point: 260 ° C.) as basic (basic material) yarn A, 56 dtex / 10 f (melting point: 110 ° C.) as low-melting yarn B As shown in FIG. 1, only the basic yarn A is arranged on the warp 1, and four basic yarns A and one yarn B having a low melting point are repeated on the weft 2 as shown in FIG. As a result, a plain fabric 10 was prepared. At that time, as shown in the figure, the fourth yarn of the basic yarn A and one of the yarn B having a low melting point were woven in the same mouth (two same mouths). Then, a living machine was produced at a density of 21 warps / cm and 26 wefts / cm. Thereafter, scouring and setting (temperature: 180 ° C.) were performed to obtain a non-coated base fabric for an airbag. While evaluating the base fabric characteristics, the airbag deployment test was performed by the method described above, and the airbag inflated state during deployment and the condition of the outer peripheral portion after deployment were observed. As shown in Table 1, the obtained base fabric had high sliding resistance, and there was no problem in the behavior during deployment and the outer periphery of the airbag after deployment. Moreover, the storage property was also good.

[Example 2]
Both warp and weft are nylon fiber yarns, using 350 dtex / 136f (melting point: 260 ° C.) as the basic yarn A and 56 dtex / 10f (melting point: 110 ° C.) as the low-melting yarn B. 2, only the basic yarn A is arranged on the weft 2, and the warp 1 is arranged by repeating three basic yarns A and one yarn B having a low melting point as a repeating unit. A woven fabric 10 was prepared. At that time, as shown in the drawing, the third yarn of the basic yarn A and the yarn B having a low melting point were woven at the same opening. Then, a living machine was created at a density of warp 32 / cm and latitude 24 / cm. Thereafter, scouring and setting (temperature: 180 ° C.) were performed to obtain a non-coated base fabric for an airbag. While evaluating the base fabric characteristics, the airbag deployment test was performed by the method described above, and the airbag inflated state during deployment and the condition of the outer peripheral portion after deployment were observed. As shown in Table 1, the obtained base fabric had high sliding resistance, and there was no problem in the behavior during deployment and the outer periphery of the airbag after deployment. Moreover, the storage property was also good.

[Example 3]
Both warp and weft are nylon fiber yarns, using 470 dtex / 136 f (melting point: 260 ° C.) as the basic yarn A and 78 dtex / 10 f (melting point: 110 ° C.) as the yarn B having a low melting point. As shown in FIG. 3, a plain fabric 10 was prepared by arranging four basic yarns A and one yarn B having a low melting point as repeating units for both the warp 1 and the weft 2. At that time, as shown in the drawing, the fourth yarn of the basic yarn A and the yarn B having a low melting point were woven at the same opening. Then, a living machine was produced at a density of 23 warps / cm and 23 wefts / cm. Thereafter, scouring and setting (temperature: 180 ° C.) were performed. Next, a solvent-free silicone resin (manufactured by Toray Dow Co., Ltd., two-component addition reaction type) was applied at a coating amount of 25 g / m ^{2 and} heat-treated at 180 ° C. for 1 minute to obtain a coated fabric for airbag. While evaluating the base fabric characteristics, the airbag deployment test was performed by the method described above, and the airbag inflated state during deployment and the condition of the outer peripheral portion after deployment were observed. As shown in Table 1, the obtained base fabric had high sliding resistance, and there was no problem in the behavior during deployment and the outer periphery of the airbag after deployment. Moreover, the storage property was also good.

[Comparative Example 1]
A plain woven fabric 10 as shown in FIG. 4 was prepared by using nylon fiber 470 dtex / 136 f (melting point: 260 ° C.) for both the warp 1 and the weft 2. A living machine was created at a density of 21 warps / cm and 21 wefts / cm. Thereafter, scouring and setting (temperature: 180 ° C.) were performed to obtain a non-coated base fabric for an airbag. While evaluating the base fabric characteristics, the airbag deployment test was performed by the method described above, and the airbag inflated state during deployment and the condition of the outer peripheral portion after deployment were observed. As shown in Table 1, the obtained base fabric had low sliding resistance and was greatly damaged from the outer peripheral portion in the development test. Further, the storage property was good.

[Comparative Example 2]
Both warp and weft are nylon fiber yarns, using 350 dtex / 136f (melting point: 260 ° C.) as the basic yarn A and 33 dtex / 10f (melting point: 110 ° C.) as the low-melting yarn B. As shown in FIG. 5, the warp 1 is provided with only the basic yarn A, and the weft 2 is arranged with four basic yarns A and one yarn B having a low melting point as a repeating unit. A woven fabric was created. At that time, as shown in the drawing, the 24th yarn of the basic yarn A and the yarn B having a low melting point were woven at the same opening as shown in the drawing. And a living machine was created at a density of 24 warps / cm and 25 wefts / cm. Thereafter, scouring and setting (temperature: 180 ° C.) were performed to obtain a non-coated base fabric for an airbag. While evaluating the base fabric characteristics, the airbag deployment test was performed by the method described above, and the airbag inflated state during deployment and the condition of the outer peripheral portion after deployment were observed. As shown in Table 1, the obtained base fabric had low sliding resistance and was greatly damaged from the outer peripheral portion in the development test. Further, the storage property was good.

[Comparative Example 3]
Both warp and weft are nylon fiber yarns, using 470 dtex / 136 f (melting point: 260 ° C.) as the basic yarn A and 110 dtex / 20 f (melting point: 110 ° C.) as the low melting yarn B. As shown in FIG. 6, the warp 1 is provided with only the basic yarn A, and the weft 2 is arranged with one basic yarn A and one yarn B having a low melting point as a repeating unit. A woven fabric 10 was prepared. At that time, as shown in the figure, the basic yarn A and the yarn B having a low melting point were woven at the same opening. Then, a living machine was produced at a density of 21 warps / cm and 42 wefts / cm. Thereafter, scouring and setting (temperature: 180 ° C.) were performed to obtain a non-coated base fabric for an airbag. While evaluating the base fabric characteristics, the airbag deployment test was performed by the method described above, and the airbag inflated state during deployment and the condition of the outer peripheral portion after deployment were observed. As shown in Table 1, the obtained base fabric had high sliding resistance, and there was no problem in the behavior during deployment and the outer periphery of the airbag after deployment. However, the base fabric was hard and good storage properties could not be obtained.

[Comparative Example 4]
Both warp and weft are nylon fiber yarns, using 470 dtex / 136 f (melting point: 260 ° C.) as the basic yarn A and 56 dtex / 10 f (melting point: 245 ° C.) as the low-melting yarn B. 1 is arranged with only the basic yarn A, and the weft 2 is composed of four basic yarns A and one yarn B having a low melting point as a repeating unit to produce the plain fabric shown in FIG. . At that time, as shown in the drawing, the fourth yarn of the basic yarn A and the yarn B having a low melting point were woven at the same opening. Then, a living machine was produced at a density of 21 warps / cm and 26 wefts / cm. Thereafter, scouring and setting (temperature: 255 ° C.) were performed to obtain a non-coated base fabric for an airbag. However, the basic assembly was also melted and cured, and an airbag could not be created.

  INDUSTRIAL APPLICABILITY The present invention can be suitably used for various airbags as an occupant protection device at the time of automobile collision.

FIG. 3 is an enlarged structure view showing the woven structure of the base fabric of Example 1. It is a structure enlarged view which shows the woven structure of the base fabric of Example 2. FIG. It is a structure enlarged view which shows the woven structure of the base fabric of Example 3. FIG. It is a structure enlarged view showing the woven structure of the base fabric of Comparative Example 1. It is a structure enlarged view showing the woven structure of the base fabric of Comparative Example 2. It is a structure enlarged view which shows the woven structure of the base fabric of the comparative example 3.

Explanation of symbols

  A ... Yarn of basic assembly material, B ... Yarn with low melting point, 1 ... Warp, 2 ... Weft, 10 ... Fabric.

Claims (5)

  A base fabric for an air bag made of a woven fabric of synthetic fibers, in which one or both of the warp and the weft is a fiber having a melting point of 50 ° C. or more lower than that of the synthetic fibers used in the basic assembly material. A base fabric for an airbag, which is interwoven on a loom in a range of 0.5 to 5.0%, and is heat-treated at a temperature higher than the melting point of the low-melting fiber after weaving.   The airbag fabric according to claim 1, wherein the yarn of the low melting point fiber is interwoven at the same opening as the yarn of the basic assembly material.   As warps and / or wefts, a plurality of yarns of the basic assembly material and a single yarn of the low melting fiber are used as a repeating unit, and the yarns of the low melting fiber are a plurality of yarns of the basic assembly material. The airbag fabric according to claim 1 or 2, wherein the airbag fabric is arranged for each.   A method for manufacturing a base fabric for an airbag made of a woven fabric of synthetic fibers, which has a melting point of 50 ° C. or more lower than that of the synthetic fibers used for the yarns of the basic assembly for either one or both of the warp and the weft The yarn of the fiber is interwoven with the yarn of the basic assembly material on a loom in the range of 0.5 to 5.0% by weight mixing ratio, and heat-treated at a temperature higher than the melting point of the low-melting fiber after weaving. A method for manufacturing a base fabric for an air bag, which is characterized.   As warps and / or wefts, a plurality of yarns of the basic assembly and one yarn of the low-melting fiber are used as a repeating unit, and the yarn of the low-melting fiber is provided for each of the plurality of yarns of the basic assembly. The manufacturing method of the fabric for airbags of Claim 4 which weaves a thread | yarn with the thread | yarn of a basic assembly material at the same opening.

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