JP2004124321A - Base fabric for air bag and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a base fabric for an air bag having air-shielding property, heat resistance and a compact holding space at the same time and excellent adhesivity to a resin coating film and provide an air bag produced by using the fabric and a method for the production of the base fabric for air bag. <P>SOLUTION: At least one surface of the base fabric for air bag composed of a fiber fabric is coated with a resin, at least a part of the single fiber constituting the fabric is enclosed with the resin and at least a part of the single fiber constituting the fabric is not enclosed with the resin. The air bag is produced by using the base fabric for air bag. The method for producing the base fabric for air bag comprises the use of a resin liquid having a viscosity of 5-20Pas (5,000-20,000 cP) and the coating of the fabric with the resin liquid by using a knife coater having a sharp-edged coating knife while keeping the contact pressure of the coating knife to the fabric to 1-15N/cm. <P>COPYRIGHT: (C)2004,JPO

Description

【００５７】
【発明の効果】
本発明によれば、空気遮断性、耐熱性、収納コンパクト性を同時に兼ね備え、かつ樹脂被膜の接着性に優れたエアバッグ用基布、エアバッグ、およびその製造方法を提供することができるので、エアバッグによる乗員保護システムを普及促進させることができる。
【図面の簡単な説明】
【図１】本発明によって得られる基布の断面模式図である。
【図２】従来のコーティング法によって得られる基布の断面模式図である。
【図３】従来の含浸法によって得られる基布の断面模式図である。
【図４】収納性試験のエアバッグの折り畳み方法を説明する模式図である。
【図５】収納性試験時のエアバッグに荷重をかけた時のバッグ厚さの測定方法を説明する模式図である。
【図６】浸透率を説明した模式図である。
【図７】電子走査顕微鏡で撮影する布帛断面箇所を説明した模式図である。
【図８】コーティングナイフの相対位置を説明した模式図である。
【符号の説明】
１：単糸（繊維）
２：樹脂
３：６０Ｌ容量エアバッグの平面図
４：折り畳み方向
５：左右から折り畳んだエアバッグの平面図
６：上下から折り畳んだエアバッグの平面図
７：上下、左右から折り畳んだエアバッグの側面図
８：荷重
９：荷重をかけた時のエアバッグの厚さ
１０：樹脂が布帛を構成するフィラメント糸の表面から内部に浸透している距離１１：布帛を構成するマルチフィラメントの高さ
１２：相対位置
１３：基布水平方向
１４：基布
１５：コーティングナイフ[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an airbag base fabric and an airbag comprising the same, which simultaneously have air-blocking properties, heat resistance, and storage compactness, and are excellent in adhesiveness of a resin film. And a method for producing the same.
[0002]
[Prior art]
2. Description of the Related Art In recent years, various airbags have been developed in order to ensure the safety of occupants in the event of an accident of various transportation means, particularly an automobile, and their effectiveness has been recognized, and their practical use has been rapidly progressing. The environment in which the airbag is used is not limited, and there is a demand for an airbag having stable mechanical performance even in a severe environment such as a high or low temperature.
[0003]
Conventionally, plain fabrics using 334 to 1,112 decitex nylon 6.6 or nylon 6 filament yarns have been used for airbags, and chloroprene and chlorosulfonate have been added to improve heat resistance, flame retardancy and air barrier properties. It was made by applying an elastomer resin such as olefin or silicone or other synthetic rubber, cutting the laminated base cloth, and sewing the base cloth.
[0004]
When, for example, a chloroprene elastomer resin is applied to a filament fabric to form a base fabric, the fabric is preferably 90 to 120 g / m 2 in view of heat resistance and flame retardancy. ² Although it was necessary to apply it, there was a problem that the thickness was increased and the package volume was increased also in terms of storability. In the case of a silicone elastomer resin having more excellent heat resistance and cold resistance than a chloroprene elastomer resin, the coating amount is 40 to 60 g / m2. ² However, there has been a problem that the storage capacity and compactness have been considerably improved, but still insufficient, and that the bag is difficult to fold when stored in a package.
[0005]
Therefore, in recent years, thinned silicone-coated base fabrics in which the amount of resin applied has been reduced in order to solve such problems have been studied. Thus, there has been proposed an airbag characterized by being unevenly distributed at a thickness ratio of 3.0 or more in a woven fabric joint (see Patent Document 1). However, although the storage compactness is improved, the actual condition is that the adhesiveness between the resin film and the fabric is not sufficient. Further, the filament woven fabric is impregnated with an aqueous emulsion of a silicone resin, and the silicone resin is added at 0.1 g / m ² From 10g / m ² (For example, refer to Patent Document 2). However, although the adhesiveness between the resin film and the fabric has been improved to some extent, the reality is that it is not sufficient in terms of air blocking properties and compactness in storage.
[0006]
[Patent Document 1]
Japanese Patent No. 2853936
[0007]
[Patent Document 2]
Japanese Patent No. 3206758
[0008]
[Problems to be solved by the invention]
The present invention has been made in view of the drawbacks of the conventional airbag, and has both air-blocking properties, heat resistance, and compactness in storage at the same time, and an airbag base fabric and an airbag comprising the same, which are excellent in adhesiveness of a resin film. It is an object of the present invention to provide a method of manufacturing the airbag base fabric.
[0009]
[Means for Solving the Problems]
The present invention employs the following means in order to solve such a problem. That is, in the airbag base fabric of the present invention, in an airbag base fabric made of a fiber fabric, at least one surface of the woven fabric is coated with a resin, and at least a part of a single yarn constituting the fabric is the same as the airbag fabric. It is characterized by being surrounded by a resin, and at least a part of the single yarn constituting the woven fabric is not surrounded by the resin.
[0010]
The airbag of the present invention is characterized by using such an airbag base fabric.
[0011]
In the method for producing a base fabric for an airbag of the present invention, a resin liquid having a viscosity in a range of 5 to 20 Pa · s (5,000 to 20,000 cP) is applied to a fiber cloth by using a coating knife having an acute angle blade. The knife coater used is characterized in that the coating is performed with a contact pressure between the coating knife and the cloth in the range of 1 to 15 / cm.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Examples of the fiber fabric in the present invention include nylon 6.6, nylon 6, nylon 12, nylon 4.6, copolymerization of nylon 6 and nylon 6.6, and copolymerization of nylon 6 with polyalkylene glycol, dicarboxylic acid, amine or the like. Polyamide fiber, polyethylene terephthalate, homopolyester fiber such as polybutylene terephthalate, polyester obtained by copolymerizing an aliphatic dicarboxylic acid such as isophthalic acid, 5-sodium sulfoisophthalic acid or adipic acid with an acid component constituting a repeating unit of polyester Fiber, aramid fiber represented by copolymerization with paraphenylene terephthalamide and aromatic ether, rayon fiber, polysulfone fiber, ultrahigh molecular weight polyethylene fiber and polymer array having sea-island structure mainly composed of the above synthetic fiber Synthetic fiber fabric is used composed of fibers. Among these, polyamide fibers and polyethylene terephthalate fibers are preferable, and nylon 6.6 and nylon 6 are more preferable in terms of impact resistance. Such fibers may contain various additives that are commonly used for improving productivity or properties in the production or processing steps of the raw yarn. For example, a heat stabilizer, an antioxidant, a light stabilizer, a leveling agent, an antistatic agent, a plasticizer, a thickener, a pigment, a flame retardant and the like can be contained.
[0013]
The airbag base fabric in the present invention requires that at least one surface of the fiber fabric be covered with a resin. By coating at least one surface with a resin, it is possible to provide air-blocking properties and further protect the fabric from high-temperature nitrogen gas generated from the inflator. The resin used in the present invention does not need to be specified, but among them, a resin having heat resistance, cold resistance and flame retardancy is preferably used. Examples of such a resin include a silicone resin, a polyamide resin, a polyurethane resin, and a fluororesin. Among them, silicone resins are particularly preferred from the viewpoint of heat resistance and air barrier properties. As such a silicone resin, a dimethyl silicone resin, a methyl vinyl silicone resin, a methylphenyl silicone resin, and a fluoro silicone resin are used. Further, the resin preferably contains a flame retardant compound. Examples of such flame-retardant compounds include halogen compounds containing bromine and chlorine, particularly, halogenated cycloalkanes, platinum compounds, antimony oxide, copper oxide, titanium oxide, phosphorus compounds, thiourea compounds, carbon, cerium, silicon oxide, and the like. Among them, halogen compounds, platinum compounds, copper oxide, titanium oxide, and carbon are more preferable.
[0014]
In the airbag base fabric of the present invention, it is important that at least a part of the single yarn constituting the fiber fabric is surrounded by the resin, and at least a part of the single yarn constituting the woven fabric is not surrounded by the resin. (See FIG. 1). The term “single yarn” as used herein means, for example, when the fiber fabric is composed of a multifilament yarn, one single yarn constituting the multifilament. Since at least a part of the single yarns constituting the fabric is surrounded by the resin, the adhesiveness between the fabric and the resin coating is improved, and at least one of the single yarns constituting the fabric is formed. Since the single yarn of the portion is not surrounded by the resin, it is possible to obtain an airbag base fabric in which the flexibility of the fabric is maintained.
[0015]
In the case of a base fabric for an airbag obtained by a conventional coating method, the resin 2 did not surround the single yarn 1 constituting the fabric because the fabric 2 had a coating of the resin 2 on the fabric surface as shown in FIG. . As a result, although the air barrier property is good, the adhesiveness between the cloth and the resin film is inferior. In the case of a base fabric for an airbag obtained by a conventional impregnation method, as shown in FIG. 3, the resin 2 is distributed in the fabric, that is, almost all single yarns are surrounded by the resin 2, but the fabric 2 is entangled with the fabric. Is difficult to form a resin film. As a result, air leaks more easily from the entangled portion of the fabric, resulting in inferior air-blocking properties. Further, since almost all single yarns are surrounded by resin, the flexibility of the fabric is impaired. On the other hand, in the present invention, the arrangement of the resin in the fabric is basically as shown in FIG. 1 so as to compensate for the drawbacks of the base fabric obtained by the conventional coating method and impregnation method. By forming a film, the air barrier property is provided, and at least a part of the single yarns 1 constituting the fabric is surrounded by the resin 2 so that the adhesiveness between the resin film and the fabric is improved. The fact that the yarn is not surrounded by the resin does not impair the flexibility of the airbag base fabric.
[0016]
The ratio of the single yarn surrounded by the above-mentioned resin is in the range of 3 to 20% with respect to all the single yarns, in that the adhesiveness between the fabric and the resin and the flexibility of the base cloth are compatible. Preferably, it is more preferably 5 to 15%. When the ratio is less than 3%, the flexibility of the base fabric is good, but the adhesiveness between the fabric and the resin is poor. When the proportion is larger than 20%, the adhesiveness between the fabric and the resin is good, but the flexibility of the airbag base fabric is impaired.
[0017]
In addition, it is preferable that the resin penetrates in a range of 10 to 70% of the thickness of the fabric, from the viewpoint of achieving both the adhesion between the fabric and the resin and the flexibility of the base fabric for an airbag, and more preferably. Is preferably in the range of 15 to 50%. Here, the rate of penetration into the thickness of the fabric refers to the rate of penetration of the resin into the multifilaments constituting the fabric. That is, in the cross section of the multifilament constituting the fabric, it refers to a value obtained by dividing the distance 10 permeating from the surface into the inside by the height 11 of the multifilament (see FIG. 6). The surface is surrounded by resin. The distance that the resin has permeated into the interior from the surface refers to the distance to the part that has permeated the interior most.
[0018]
When the above-mentioned permeability is less than 10%, the adhesiveness between the fabric and the resin is inferior in terms of flexibility as an airbag base fabric. On the other hand, if it is larger than 70%, the adhesiveness between the fabric and the resin is good, but the flexibility as the base fabric for an airbag is impaired.
[0019]
The amount of the resin adhered is 5 to 30 g / m. ² Is preferable in terms of air barrier properties and compactness of storage, and more preferably 5 to 20 g / m2. ² Is good in terms of storage compactness. 5 g / m of resin adhesion ² If it is less than 3, it is difficult to completely cover the fabric surface with the resin film, and air leakage is likely to occur. In addition, 30 g / m ² A larger amount is preferable in terms of air blocking properties, but is preferable in terms of storage compactness because the resin film on the fabric surface becomes thicker or the amount of resin in the fabric increases and the flexibility of the airbag base fabric is impaired. Absent.
[0020]
The total fineness of the yarn used in the synthetic fiber woven fabric constituting the base fabric for an airbag in the present invention is preferably in the range of 100 to 600 dtex, and particularly considering the balance between compactness of storage and strong surface, 200 to 200 dtex. It is better to be within the range of 500 dtex. The fineness of the single yarn constituting the yarn is preferably in the range of 1 to 7 dtex, and particularly preferably in the range of 2 to 5 dtex, from the viewpoint of storage compactness and adhesiveness between the fabric and the resin. . When the single yarn fineness is within the above range, the resin easily penetrates between the single yarns when coated with the resin, and the resin easily surrounds the single yarn.
[0021]
Further, the yarn used may have a round or flat single yarn cross-sectional shape. When a yarn having a flat cross-section having a ratio of the long axis to the short axis of the cross section, that is, the aspect ratio in the range of 1.5 to 6, is used, the thickness of the base fabric can be reduced, and the storability is improved. The flat cross-section yarn is usually elliptical, but may have a shape other than elliptical as long as it satisfies an aspect ratio in the range of 1.5 to 6. For example, a symmetrical type such as a rectangle, a rhombus, and a cocoon type, as well as a left-right asymmetrical type or a combination thereof may be used. Further, the above-described basic type has projections, dents, or partially hollow portions. You may. In particular, it is preferable to make the cross section of the single yarn elliptical, since the surface of the fabric is smoothed, so that the coating amount can be reduced.
[0022]
Further, it is preferable that the yarn used is a non-twist yarn in terms of adhesiveness between the fabric and the resin. If the yarn is twisted, the multifilaments converge, so that it becomes difficult for the resin to penetrate between the single yarns when coated with resin, and as a result, it becomes difficult for the resin to surround the single yarn. It is not preferable in terms of adhesiveness.
[0023]
Further, as the structure of the fabric, plain weave, twill weave, satin weave and their modified weaves, woven fabrics such as multiaxial weaves, non-woven fabrics, spunbonds are used. Among them, in particular, because of their excellent mechanical properties, Plain fabrics are preferred.
[0024]
In addition, as a loom used in the weaving process, a water jet room, an air jet room, a rapier room, and the like are used.
[0025]
The basis weight of the airbag base fabric of the present invention is 300 g / m. ² The thickness is preferably not more than 0.35 mm in terms of weight reduction, and the thickness is preferably not more than 0.35 mm from the viewpoint of compactness in storage. The stiffness is not more than 100 mm in both the warp and weft directions. This is preferable in terms of storage compactness. In addition, when the base fabric for an airbag has a tensile strength of 300 N / cm or more, an elongation at break of 15% or more, and a tear strength of 100 N or more, the airbag can be stored and prevented from bursting when used as an airbag. It is preferable from the point of view.
[0026]
Further, the base fabric for an airbag of the present invention is used for an airbag for a driver seat, an airbag for a passenger seat, an airbag for a rear seat, an airbag for a side, an airbag for an inflatable curtain, an airbag for a knee, and the like. Can be.
[0027]
The base fabric for an airbag of the present invention is a knife using a resin knife having a viscosity in the range of 5 to 20 Pa · s (5,000 to 20,000 cP) with a coating knife having an acute angle blade. It can be manufactured by coating with a coater in a contact pressure between the coating knife and the cloth in a range of 1 to 15 N / cm.
[0028]
The viscosity of the resin liquid is a viscosity measured by a B-type viscometer based on JIS Z8803. If the viscosity is less than 5 Pa · s (5,000 cP), the viscosity is too low and is not suitable for knife coating. On the other hand, if it is larger than 20 Pa · s (20,000 cP), not only is it difficult to perform coating with a low coating amount, but also it becomes difficult for the resin liquid to penetrate between the single yarns constituting the fabric, and the resin can sufficiently form the single yarns. You can no longer siege.
[0029]
As a coating method, a knife coating method is used in consideration of low coating amount of the resin and resin permeability to the fabric. The knife coating method includes a knife over roll method, a knife over belt method, and a floating knife method. The floating knife method is preferably used from the viewpoints of reducing the amount of resin coating and resin permeability to fabric.
[0030]
As for a coating knife used for coating, a sharp-edged coating knife is used to reduce the amount of coating. As the shape of the coating knife, an arc knife or a crevice knife is used, but a crevice knife is preferable in consideration of a low coating amount of the resin and a resin permeability to the cloth.
[0031]
Further, in order to allow the resin to penetrate the fabric to some extent and to surround the single yarns constituting the fabric with the resin, the contact pressure of the coating knife on the fabric is an important point, and the contact pressure is 1 to 15 N /. It needs to be adjusted to within cm. If the contact pressure is less than 1 N / cm, the contact pressure is too low and the resin does not easily penetrate into the fabric, and the resin cannot sufficiently surround the single yarn constituting the fabric. On the other hand, if the contact pressure is more than 15 N / cm, there is a problem in the processability of the fabric, and the desired amount of resin coating cannot be obtained, and it becomes difficult to cover the fabric surface with the resin film. Not good in terms of As a method for keeping the contact pressure within the above-mentioned range, for example, in the case of the floating knife method, the coating knife is adjusted by the penetration depth of the coating knife to the fabric, and the relative position of the coating knife to the fabric at that time is adjusted to 1 to 5 cm. Is preferable in satisfying the above-mentioned contact pressure condition. Here, the relative position 12 refers to a position where the coating knife 15 is inserted vertically downward to the base cloth 14 with respect to the base cloth horizontal direction 13 before the coating knife is inserted. (See Fig. 8)
[0032]
【Example】
Next, the present invention will be described in more detail with reference to examples. Various evaluations in the examples were performed according to the following methods.
Percentage of the fibers surrounded by the resin with respect to all the fibers constituting the base fabric (surrounding ratio): A cross-sectional photograph of the woven fabric is taken with a scanning electron microscope (SEM) under the following conditions, and the single yarn constituting one multifilament Among them, single yarns surrounded by resin are counted and represented by the following formula.
(Number of single yarns surrounded by resin) / (number of single yarns constituting one multifilament) × 100 (%)
Permeability: A cross-sectional photograph of the fabric is taken with a scanning electron microscope (SEM) under the following conditions, and the distance penetrating from the surface into the inside of the fabric and the height of the multifilament are measured and expressed by the following formula.
[0033]
(Distance that resin has penetrated into the fabric from the surface) / (Height of multifilament) × 100%
Air permeability: determined according to JIS L1096 (8.27.1A method).
Adhesiveness of resin: In accordance with JIS K6328 (5.3.8 method), the presence or absence of peeling of the resin film when the number of times of fir was 500 was examined.
Flame retardancy: measured by FMVSS-302. A burning rate of 100 mm / min or less was rated as ○, and a burning rate exceeding 100 mm / min was rated as x.
Viscosity: Measured with a B-type viscometer based on JIS Z8803 (8) at a constant temperature bath temperature of 25 ° C.
Storage compactness: As shown in FIG. 4, a 60-L capacity airbag is first folded four times from the left and right into bellows so as to have a size of 150 × 150 mm, and then folded four times from above and below into a bellows. As shown in FIG. 5, a load 8 of 10 N was applied to the sample, and the thickness 9 of the bag at that time was measured. Then, after removing the load 8, the thickness of the bag after one minute was measured. Note that an airbag having a capacity of 60 L was prepared by the following method.
[0034]
Two circular cloths of 725 mm in diameter are cut out from the base cloth for airbag by a punching method, and three circular reinforcing cloths of 200 mm in diameter made of the same cloth are laminated at the center of one circular cloth. The sewing machine was sewn on the 110 mm, 145 mm, and 175 mm lines with 1,400 dtex sewing thread of nylon 6.6 fiber for both upper and lower threads to form a hole having a diameter of 90 mm to provide an inflator attachment port. Conversely, one circular reinforcing cloth of the same cloth having a diameter of 75 mm is applied to the position of 255 mm in the bias direction from the center, and nylon 6.6 fibers are applied on the 50 mm and 60 mm diameter lines, both up and down. The sewing machine was sewn with lock stitches using 1,400 dtex sewing thread, and two vent holes provided with holes having a diameter of 40 mm were provided.
[0035]
Then, the reinforcing cloth side of this circular cloth is set outside, and the other circular cloth is overlapped with the warp axis shifted by 45 degrees, and the upper and lower yarns on the circumference of 700 mm in diameter and 710 mm are both nylon 6.6 fibers. After the sewing machine was sewn with double chain stitching using a sewing thread of 400 dtex, the bag body was turned over to produce a non-coated airbag having a capacity of 60 L.
Scanning electron microscope (SEM) imaging conditions: A cross section of the cloth cut at the position shown in FIG. 7 was scanned with a Hitachi S-3500N scanning electron microscope at a magnification of 200 times, a resolution of 640 × 480, and a resolution of 640 × 480. Photographed at a speed of 80 / 100s.
[0036]
In addition, the yarn used in the examples was a yarn produced by the following production method.
[0037]
Using an extruder-type spinning machine, nylon 66 chips having a relative viscosity of 98% sulfuric acid of 3.7 at 25 ° C were melt-spun at 295 ° C. In each spinning machine, a spinneret having a different aspect ratio, shape, and number of holes is used, yarn is spun from a spin pack having the spinneret, and the airbag raw yarns of 470 dtex, 350 dtex and 235 dtex are directly spun and drawn. Was made.
[0038]
Example 1
Total yarn size 470dtex, 72 filaments, strength 8.4cN / dtex, elongation 22%, aspect ratio 1.0, non-twisted nylon 6.6 fiber round cross section filament yarn in water jet loom, warp yarn tension Was set to 70 cN / thread, and the weaving density of both the warp and the weft was adjusted to 46 threads / 2.54 cm to obtain a woven fabric having a flat structure. Next, a non-solvent methylvinylsilicone resin liquid having a viscosity of 12 Pa · s (12,000 cP) was applied to the woven fabric by a floating knife coater using a slat plate knife, and the contact pressure between the woven fabric and the slat plate knife was 9 N / cm. And the resin adhesion amount is 15 g / m ² After performing coating, vulcanization treatment was performed at 190 ° C. for 2 minutes to obtain a base fabric for an airbag.
[0039]
Table 1 shows the characteristics of the airbag fabric thus obtained. This airbag base fabric was excellent in air blocking properties, bag storage compactness, flame retardancy, and also excellent in resin adhesiveness.
[0040]
Comparative Example 1
The contact pressure between the fabric and the crevice knife is maintained at 0.8 N / cm, and the resin adhesion amount is 15 g / m. ² A base fabric for an airbag was obtained in the same manner as in Example 1 except that the coating was performed so as to be as follows.
[0041]
Table 1 shows the characteristics of the airbag fabric thus obtained. This airbag base fabric did not have any problems with the air-blocking property, the bag storage compactness, and the flame retardancy, but was inferior in the resin adhesiveness.
[0042]
Comparative Example 2
The nylon 6.6 yarn used in Example 1 was twisted at 100 T / m, and the resin adhesion amount was 15 g / m with a comma coater (contact pressure between the woven fabric and the comma was 0 N / cm). ² A base fabric for an airbag was obtained in the same manner as in Example 1 except that the coating was performed so as to be as follows.
[0043]
Table 1 shows the characteristics of the airbag fabric thus obtained. This airbag base fabric did not have any problems with the air-blocking property, the bag storage compactness, and the flame retardancy, but was inferior in the resin adhesiveness.
[0044]
Example 2
Using a flat cross-section filament yarn of non-twisted nylon 6.6 fiber with a total fineness of 350 dtex, 96 filaments, strength of 8.4 cN / dtex, elongation of 22%, aspect ratio of 3.0 and non-twisted nylon fiber, warp yarn tension Was set to 100 cN / thread, and the weaving density of both the warp and the weft was adjusted to 59 threads / 2.54 cm to obtain a woven fabric having a flat structure. Then, a toluene-diluted methylvinylsilicone resin solution (resin solid content: 80%) having a viscosity of 8 Pa · s (8,000 cP) was applied to the fabric by a floating knife coater using a damper knife. Is maintained at 2 N / cm, and the resin adhesion amount is 20 g / m ² After the coating, drying was performed at 130 ° C. for 1 minute and vulcanization treatment was performed at 200 ° C. for 2 minutes to obtain a base fabric for an airbag.
[0045]
Table 1 shows the characteristics of the airbag fabric thus obtained. This airbag base fabric was excellent in air blocking properties, bag storage compactness, flame retardancy, and also excellent in resin adhesiveness.
[0046]
Comparative Example 3
A toluene-diluted methyl vinyl silicone resin solution (resin solid content 90%) having a viscosity of 25 Pa · s (25,000 cP) was applied to the flat-textured woven fabric obtained in Example 2 using a comma coater (contact pressure between the woven fabric and the comma). 0N / cm) and the resin adhesion amount is 35g / m ² After coating, the coating was dried at 130 ° C. for 1 minute and vulcanized at 200 ° C. for 2 minutes to obtain an airbag base fabric.
[0047]
Table 1 shows the characteristics of the airbag fabric thus obtained. This airbag base fabric did not have any problems with air blocking properties and flame retardancy, but was inferior in bag storage compactness and resin adhesiveness.
[0048]
Comparative Example 4
The contact pressure between the woven fabric and the crevice knife is maintained at 17 N / cm, and the resin adhesion amount is 4 g / m. ² In the same manner as in Example 2 except that coating was performed so as to obtain an airbag base fabric.
[0049]
Table 1 shows the characteristics of the airbag fabric thus obtained. Although the airbag base fabric did not have a problem of compactness for storing the bag, it was inferior in terms of air barrier property because a continuous resin film was not formed on the surface of the fabric, and also inferior in flame retardancy and resin adhesiveness. Was.
[0050]
Example 3
Using a filament having a total fineness of 235 dtex, 72 filaments, a strength of 8.4 cN / dtex, an elongation of 24%, an aspect ratio of 1.0, and a non-twisted nylon 6 fiber in a round cross section, the warp yarn tension is 90 cN in an air jet loom. / Weft, and the woven density of both the warp and the weft was adjusted to be 76 / 2.54 cm to obtain a woven fabric having a flat structure. Next, the woven fabric was immersed in a hot water bath containing 0.5 g / l of sodium alkylbenzene sulfonate and 0.5 g / l of soda ash for 3 minutes, dried at 130 ° C. for 2 minutes, and then at 180 ° C. for 1 minute. Heat heat set. Next, an aqueous urethane resin liquid (resin solid content: 50%) having a viscosity of 10 Pa · s (10,000 cP) was applied to the heat-set woven fabric by a floating knife coater using a sword plate knife. Knife contact pressure is maintained at 6N / cm and resin adhesion amount is 20g / m ² After drying, the resultant was dried at 130 ° C. for 1 minute to obtain an airbag base fabric.
[0051]
Table 1 shows the characteristics of the airbag fabric thus obtained. This airbag base fabric was excellent in air blocking properties, bag storage compactness, flame retardancy, and also excellent in resin adhesiveness.
[0052]
Comparative Example 5
An aqueous urethane resin liquid (resin solid content: 50%) having a viscosity of 23 Pa · s (23,000 cP) was applied to the heat-set fabric obtained in Example 3 by a floating knife coater using a damper knife. And the contact pressure of the crevice knife is maintained at 16 N / cm, and the resin adhesion amount is 20 g / m. ² After drying, the resultant was dried at 130 ° C. for 1 minute to obtain an airbag base fabric.
[0053]
Table 1 shows the characteristics of the airbag fabric thus obtained. This airbag base fabric did not have any problems with the air-blocking property, the bag storage compactness, and the flame retardancy, but was inferior in the resin adhesiveness.
[0054]
Comparative Example 6
The heat-set fabric obtained in Example 3 was immersed in an aqueous urethane resin solution (resin solid content: 50%) having a viscosity of 3 Pa · s (3,000 cP), and the resin adhesion amount was 10 g / m in solid content. ² After squeezing with a mangle so as to obtain, it was dried at 130 ° C. for 2 minutes to obtain a base fabric for an airbag.
[0055]
Table 1 shows the characteristics of the airbag fabric thus obtained. This airbag base fabric had no problem with respect to the adhesiveness of the resin, but was inferior in terms of air barrier properties and bag storage compactness.
[0056]
[Table 1]

[0057]
【The invention's effect】
According to the present invention, it is possible to provide an airbag base fabric, an airbag, and a method for manufacturing the same, which simultaneously have air blocking properties, heat resistance, and compactness in storage, and have excellent adhesiveness of a resin film. An occupant protection system using an airbag can be promoted.
[Brief description of the drawings]
FIG. 1 is a schematic sectional view of a base fabric obtained by the present invention.
FIG. 2 is a schematic cross-sectional view of a base fabric obtained by a conventional coating method.
FIG. 3 is a schematic cross-sectional view of a base fabric obtained by a conventional impregnation method.
FIG. 4 is a schematic diagram illustrating a method of folding an airbag in a storage test.
FIG. 5 is a schematic diagram illustrating a method of measuring a bag thickness when a load is applied to an airbag during a storage test.
FIG. 6 is a schematic diagram illustrating a permeability.
FIG. 7 is a schematic diagram illustrating a cross section of a cloth taken by an electronic scanning microscope.
FIG. 8 is a schematic diagram illustrating a relative position of a coating knife.
[Explanation of symbols]
1: Single yarn (fiber)
2: Resin
3: Plan view of 60L capacity airbag
4: Folding direction
5: Top view of airbag folded from left and right
6: Top view of airbag folded from above and below
7: Side view of airbag folded from top, bottom, left and right
8: Load
9: Thickness of airbag when load is applied
10: distance from the surface of the filament yarn constituting the fabric to the inside of the filament 11: height of the multifilament constituting the fabric
12: Relative position
13: Base fabric horizontal direction
14: Base cloth
15: Coating knife

Claims (6)

In an airbag base fabric made of a fiber fabric, at least one surface of the fabric is covered with a resin, and at least a part of single yarns constituting the fabric is surrounded by the resin, and the fabric is formed. A base fabric for an airbag, wherein at least some of the single yarns are not surrounded by the resin. The base fabric for an airbag according to claim 1, wherein a ratio of the single yarn surrounded by the resin is in a range of 3 to 20% with respect to all the single yarns. The airbag base fabric according to claim 1 or 2, wherein the resin has permeated within a range of 10 to 70% of the thickness of the fabric. Adhesion amount of the resin is in the range of 5 to 30 g / m ^2, an airbag fabric according to any one of claims 1 to 3. An airbag using the airbag base fabric according to claim 1. A resin liquid having a viscosity in the range of 5 to 20 Pa · s (5,000 to 20,000 cP) is applied to the fiber cloth by a knife coater using a coating knife having an acute angle blade, and a contact pressure between the coating knife and the cloth is applied. Is coated within a range of 1 to 15 N / cm.

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