JP2008150754A - 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, which has reduced opening, and to provide a method for producing the same. <P>SOLUTION: The base fabric for the airbag includes a woven fabric and a resin layer containing a thermoplastic resin and laminated at least on a part thereof, and has a sliding resistance of ≥300 N measured based on ASTM D 6479-02 (2003), and an air permeability of ≤0.5 L/cm<SP>2</SP>min at an air pressure of 19.6 kPa. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an airbag base fabric.

  The required performance for airbag fabrics includes low air permeability, mechanical properties, and storage properties, but the requirements for anti-missing properties are becoming stricter. In an airbag obtained by cutting and sewing an airbag base fabric, the seam misalignment when the airbag is deployed is called misalignment, but it improves the internal pressure when deploying the airbag and occupant restraint performance in the event of an accident. This is because it is important to improve the resistance against the eye misalignment, that is, the anti-eye misalignment, in order to improve the above.

  Airbag base fabrics used for airbags are broadly put into practical use: non-coated airbags that are used as they are without applying resin on the fabric surface, and coated airbags that are used by applying resin on the fabric surface. . However, in both cases, it was difficult to further improve the anti-missing property while maintaining low air permeability, mechanical properties, and storage properties.

  On the other hand, an airbag base fabric in which a film is laminated on the surface of a woven fabric is disclosed (for example, see Patent Document 1). However, even in this technique, there is a problem that the film is easily damaged from the sewn part, and the anti-missing property is not improved.

Moreover, in order to improve the adhesiveness of a fabric and a film, the airbag sheet | seat formed by directly laminating | stacking the resin film which consists of a thermoplastic resin which has polarity is disclosed (refer patent document 2). However, it did not improve the anti-missing property with respect to an airbag having a sewing portion.
JP-A-5-213136 JP 2003-246253 A

  An object of this invention is to provide the base fabric for airbags which improved the anti-missing property.

That is, the present invention comprises a fabric and a resin layer containing a thermoplastic resin at least partially laminated, and has a sliding resistance measured in accordance with ASTM D 6479-02 (2003) of 300 N or more and an air permeability at an air pressure of 19.6 kPa. Is a base fabric for an air bag characterized by being 0.5 L / cm ² · min or less.

  Moreover, this invention is a method of manufacturing the base fabric for airbags of this invention, Comprising: The process of thermocompression-bonding the said resin layer on the said fabric at the temperature higher than melting | fusing point of the thermoplastic resin which the said resin layer contains is included. This is a method for manufacturing an airbag base fabric.

  ADVANTAGE OF THE INVENTION According to this invention, the base fabric for airbags which improved anti-gap misalignment can be provided, maintaining low air permeability, lightweightness, etc.

  Examples of the polymer constituting the warp and weft of the fabric in the airbag fabric of the present invention include polyesters such as polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate, polyhexamethylene adipamide, and polytetramethylene. Examples include polyamides such as adipamide and polycapramide, polyacrylonitrile, polyolefins such as polyvinyl alcohol, polyethylene and polypropylene, aromatic polyamides, and aromatic polyesters. Among these, polyamide is preferable in terms of mechanical properties and chemical resistance, and polyhexamethylene adipamide is particularly preferable in terms of heat resistance.

  The fibers that make up warp and weft are matte agents such as titanium oxide, calcium carbonate, kaolin, and clay, pigments, dyes, lubricants, antioxidants, heat-resistant agents, anti-waxing agents, UV absorbers, and antistatic agents. It is also preferable to contain an agent, a flame retardant and the like.

  The cross-sectional shape of the single fiber may be elliptical, rectangular, rhombus, saddle-shaped, or asymmetrical in addition to round. Moreover, a thing with a protrusion, a dent, and a hollow part partially may be sufficient.

  The fineness of the single fiber is preferably 1 to 12 dtex, more preferably 3 to 8 dtex, from the viewpoint of the mechanical properties and storage properties of the airbag fabric. When the single fiber fineness is smaller than 1 dtex, there is no problem in terms of storage properties, but it is difficult to obtain a high-strength multifilament at the yarn-making stage, and the mechanical properties of the fabric deteriorate. In addition, defects such as yarn breakage and fluff are likely to occur in the yarn making process, and the productivity during yarn production and weaving deteriorates. On the other hand, when the single fiber fineness is larger than 12 dtex, the storage property is deteriorated due to the increased rigidity of the multifilament.

  The number of single filaments of warp and weft multifilaments is preferably 12 to 192, more preferably 24 to 154.

  The total fineness of the multifilament is preferably from 100 to 700 dtex, more preferably from 150 to 600 dtex, and even more preferably from 210 to 500 dtex, from the viewpoint of mechanical properties and storage properties of the fabric. When the total fineness is less than 100 dtex, there is no problem in terms of storage properties, but the tear resistance deteriorates because the total fineness is thin. When the total fineness is larger than 700 dtex, there is no problem in mechanical properties, but the woven fabric becomes thicker, so that the storage property is deteriorated.

  As the woven structure of the woven fabric, a plain structure, an oblique structure, a satin structure, etc. can be adopted. Among them, uniform mechanical properties, ease of mass production, cost reduction by high-speed production, stable woven structure From the viewpoint of properties and the like, a plain structure is preferable.

The cover factor (CF) of the woven fabric is preferably 1000 to 2100, more preferably 1400 to 1900, and still more preferably 1600 to 1800, from the viewpoint of mechanical properties and storage properties. When the cover factor (CF) is smaller than 1000, there is no problem in terms of storage properties, but since the fabric is inferior in mechanical properties, it bursts when the airbag is deployed. When the cover factor (CF) is larger than 2100, there is no problem in mechanical characteristics, but the storage property is inferior, so that the workability at the time of folding and storing the bag is deteriorated.
The cover factor (CF) is defined by the following equation.
CF = CF1 + CF2
CF1 = (Dw × 0.9) ^1/2 × Nw
CF2 = (Df × 0.9) ^1/2 × Nf
Here, CF: Cover factor CF1: Cover factor of warp yarn CF2: Cover factor of weft yarn Dw: Total fineness of warp yarn (dtex)
Df: Total fineness of the weft yarn (dtex)
Nw: Woven density of warp yarn (main / 2.54cm)
Nf: Weft density of the weft yarn (main / 2.54 cm).

  It is important that the airbag base fabric of the present invention is formed by laminating a woven fabric and a resin layer containing a thermoplastic resin at least partially. By doing so, it can be set as the base fabric for airbags excellent in the resistance to misalignment. The reason is that by forming a thermoplastic resin layer on the fabric surface, the resin layer plays a role in maintaining the structure of the fabric, and the elastic recovery of the thermoplastic resin is possible even when needles and threads are pierced by sewing. This is considered to be because the resin layer and the structure of the woven fabric are not easily destroyed from the hole.

  Furthermore, when the airbag is deployed, the thermoplastic resin can be fluidized by the hot gas generated from the inflator and recovered so as to close the hole, thereby improving the anti-missing property during deployment.

  As the thermoplastic resin, for example, a homopolymer or a copolymer such as polyester, polyethylene, polyamide, polyolefin, and polyurethane can be used.

  In addition, the resin layer may be formed of only a single thermoplastic resin, or may be formed by using another thermoplastic resin or thermosetting resin in combination by mixing and / or lamination.

  The resin layer containing the thermoplastic resin may be a single layer, but an adhesive layer having high adhesion to the fabric and another layer for protecting the adhesive layer from oxidation or the like and improving flame retardancy ( A multi-layer structure with a protective layer is also preferable.

  The thermoplastic resin used for the adhesive layer preferably has a melting point of 200 ° C. or lower, and the thermoplastic resin constituting the adhesive layer has the lowest melting point among the thermoplastic resins constituting the resin layer. The melting point is preferred. By doing so, the adhesive layer can reach both ends of the warp yarn and the weft yarn in the width direction as a part of the resin layer, as will be described later.

  As the thermoplastic resin used for the adhesive layer, for example, a polyamide, polyolefin, polyurethane homopolymer or copolymer having a melting point of 200 ° C. or less can be preferably used.

  The polymer mixed with the thermoplastic resin used in the adhesive layer or combined as the protective layer is preferably a polyester from the viewpoint of cost, and a polyester copolymer is preferably used to achieve the drip flame retardancy described later. it can.

  Moreover, you may use additives, such as a crosslinking agent, a binder, and an inorganic component, for a resin layer.

  In the airbag fabric of the present invention, it is preferable that a part of the resin layer reaches both ends (8-8 ′ in FIG. 2) in the width direction of the warp and weft yarns of the woven fabric. By doing so, stronger adhesion between the resin layer and the fabric can be ensured. Furthermore, it is possible to suppress the turbulence of the woven fabric structure at that point even when the needle or thread is pierced.

  In addition, the fact that a part of the resin layer surrounds a part of the single fiber constituting the warp yarn or the weft yarn ensures a stronger adhesion between the resin layer and the woven fabric, and can suppress the disorder of the woven fabric structure. This is preferable.

The thickness of the resin layer is an average of 3 to the thickness from the top of the yarn in the woven fabric to the surface of the resin layer (see H in FIG. 2, hereinafter also referred to as “thickness between the top of the yarn and the surface of the resin layer”). 80 micrometers is preferable, More preferably, it is 5-60 micrometers, More preferably, it is 8-50 micrometers. By setting the thickness to 3 μm or more, it is possible to obtain an effect of improving the anti-missing property.
In addition, when the thickness is 80 μm or less, it is possible to prevent a decrease in storage performance. Further, as described later, a part of the resin layer reaches the both ends in the width direction of the warp yarn and the weft yarn in the work. Can be easily achieved. Moreover, by setting it as 80 micrometers or less, the outstanding flame retardance can be acquired even if it does not add a flame retardant etc. especially.

  The base fabric for an air bag of the present invention has a sliding resistance measured according to ASTM D 6479-02: 2003 of 300 N or more, preferably 400 N or more, more preferably 500 N or more. By setting the sliding resistance force to 300 N or more, it is possible to suppress the seam misalignment when the airbag is deployed, and thus it is possible to ensure a sufficient internal pressure to reliably protect the occupant. When the sliding resistance is less than 300 N, the seam misalignment is large, so that air leaks and the internal pressure is not sufficiently maintained when the bag is deployed.

The air bag base fabric of the present invention has an air permeability at an air pressure of 19.6 kPa of 0.5 L / cm ² · min or less, preferably 0.3 L / cm ² · min or less, more preferably 0.1 L / cm. ² · min or less. By setting the air permeability to 0.5 L / cm ² · min or less, air leakage from the bag body can be suppressed, so that an internal pressure for reliably protecting an occupant can be secured.

  In the airbag fabric of the present invention, the burning rate measured according to the FMVSS302 method is preferably 100 mm / min or less, more preferably 80 mm / min or less. By setting the combustion speed to 100 mm / min or less, the safety standard for automobile accidents and in-vehicle fires is satisfied.

  Next, it is important that the method for producing the airbag fabric of the present invention includes a step of thermocompression bonding the resin layer on the fabric at a temperature higher than the melting point of the thermoplastic resin included in the resin layer. By doing so, the thermoplastic resin melted and softened by heat reaches the both ends of the warp yarn and weft yarn in the width direction, and the fabric and the resin layer can be firmly bonded. However, if the temperature is set close to the melting point of the polymer constituting the woven fabric, the physical properties of the woven fabric are deteriorated. Therefore, the temperature is preferably lower than the melting point of the polymer constituting the woven fabric. For example, for a fabric composed of nylon 6,6, the roll temperature during thermocompression bonding is preferably 220 ° C. or lower.

  As a method of thermocompression bonding the resin layer on the woven fabric, an extrusion lamination method, a thermal lamination method, or the like can be employed.

  The extrusion laminating method is preferable in that the production efficiency can be improved because the extrusion molding of the resin layer and the lamination to the woven fabric can be performed simultaneously.

  The thermal laminating method is a method in which a resin layer that has been formed into a film in advance is created and then laminated and thermocompression bonded. After checking the presence or absence of pinholes and quality properties, it can be laminated with fabrics, ensuring stable quality. -It is preferable at the point which can obtain the base fabric for airbags which has quality.

  In the thermal laminating method, the elongation of the film used for thermocompression bonding to the fabric is preferably 80% or more, more preferably 150% or more, and further preferably 200% or more. By setting it to 80% or more, the resin layer follows the stretch of the fabric when the airbag is deployed, and the internal pressure can be maintained without breaking the resin layer first.

  In both the extrusion laminating method and the thermal laminating method, the thermocompression bonding temperature can be controlled by the roll temperature.

  The pressure for thermocompression bonding is preferably 10 kg / cm or more, more preferably 15 kg / cm or more. By doing so, the molten thermoplastic resin is coated so as to follow the unevenness of the fabric, and as described above, a part of the resin layer reaches the both ends of the warp yarn and the weft yarn in the width direction. Can be obtained.

  The feed rate of thermocompression bonding is preferably 80 m / min or less, more preferably 40 mm / min, in order to obtain an embodiment in which a part of the resin layer reaches the both ends of the warp yarn and weft yarn in the width direction. is there.

[Measuring method]
(1) Total fineness of woven yarn JIS L1013: 1999 8.3.1 Based on the A method, make 112.5m skeins with 3 samples, measure their mass, and average value (g) Was multiplied by 10,000 / 112.5 and converted to an apparent fineness. From the apparent fineness, the positive fineness was calculated based on the following formula.
F ₀ = D × (100 + R ₀ ) / (100 + R _e )
Here, F ₀ : Positive fineness (dtex)
D: Apparent fineness (dtex)
R ₀ : Official moisture content (%)
R _e : parallel moisture content.

(2) Basis weight Based on JIS L1096: 1999 6.4.2, three test pieces having an outer dimension of 20 cm × 20 cm are collected, each mass (g) is measured, and the average value is the mass per 1 m ² ( g / m ² ).

(3) Thickness of base fabric for fabrics and airbags Based on JIS L 1096: 1999 8.5, thickness was reduced under a pressure of 23.5 kPa using a thickness measuring machine at five different points of the sample. Then, after waiting for 10 seconds, the thickness was measured and the average value was calculated.

(4) Sliding resistance force Measured according to ASTM D6479-02.

(5) Air flow rate The air flow rate when tested at a test differential pressure of 19.6 kPa was measured according to JIS L 1096: 1999 8.27.1 A method (Fragile type method). Samples of about 20cm x 20cm are collected from 5 different locations of the sample, attached to one end of a cylinder with a diameter of 100mm, fixed so that there is no air leakage from the mounting location, and a test differential pressure using a regulator. It adjusted to 19.6 kPa, the air quantity which passes a test piece at that time was measured with the flowmeter, and the average value about five test pieces was computed.

(6) Melting point The peak temperature of the endothermic melting curve when 5 ml of sample was heated from room temperature at a heating rate of 10 ° C./min using a suggested thermal scanning calorimeter DSCII type manufactured by Seiko Instrument Co., Ltd. (Tm).

(7) Elongation at break of film According to the method defined in JIS K 7127: 1999, for each of the longitudinal direction and the width direction of the resin layer, three samples were sampled at a length of 150 mm and a width of 10 mm, Attached to a constant-speed extension type tester at a grip interval of 100 mm, pulled at a tensile speed of 200 mm / min until the test piece broke, and read the length L at the time of breakage. An average value was calculated for each direction.
E = [(L−L ₀ ) / L ₀ ] × 100
Where E: elongation at break (%),
L: Length at break (mm),
L ₀ : Grasp interval (100 mm).

(8) Thickness between yarn top and resin layer surface Six test pieces of 1 cm × 1 cm were collected from different portions of the sample. For each of the weft and warp yarn directions, the number of samples was 3, and the samples cut along the A line or B line in FIG. 1 were each magnified with a scanning electron microscope (SEM) (S-4000 type manufactured by Hitachi, Ltd.). The cross section was observed at a magnification of 100 times, the thickness between the top of the yarn and the surface of the resin layer (H in FIG. 2) was measured, the thinnest value in the field of view was measured, and the average value of six samples was calculated.

(9) Adhesion state of woven fabric and resin layer In the observation of the cross section (A line in FIG. 1) along the weft direction by the scanning electron microscope in (8) above, the width of the warp yarn of the woven fabric is part of the resin layer. It was observed whether or not both ends in the direction (8-8 ′ in FIG. 2) were reached, and the adhesion state between the fabric and the resin layer was determined based on the following criteria.
A: A part of the resin layer reaches both ends in the width direction of the warp yarns of all the fabrics in the field of view of the three samples.
A: Within the field of view of the three samples, there is one portion where a part of the resin layer does not reach both ends in the width direction of the warp yarn of the woven fabric.
Δ: In the field of view of the three samples, there are two places where a part of the resin layer does not reach both ends in the width direction of the warp yarn of the woven fabric.
X: Within the field of view of the three samples, there are three or more portions where a part of the resin layer does not reach both ends in the width direction of the warp yarn of the woven fabric.

(10) Tensile strength JIS L 1096: 1999 8.12.1 Based on the labeled strip method of the A method, five test pieces were taken in each of the vertical and horizontal directions, and the yarn was removed from both sides of the width. The test piece was pulled at a gripping interval of 150 mm and a tensile speed of 200 mm / min until the test piece was cut, the maximum load until cutting was measured, and the average value was calculated for each of the vertical and horizontal directions.

(11) Elongation at break JIS L 1096: 1999 8.12.1 Based on the labeled strip method of the A method, five test pieces were taken for each of the vertical direction and the horizontal direction, and the yarns were taken from both sides of the width. Remove the width to 30 mm, attach a mark line at 100 mm intervals to the center of these test pieces, pull until the test piece is cut at a gripping interval of 150 mm and a pulling speed of 200 mm / min, and set the distance between the mark lines when cutting. The elongation at break was calculated according to the following equation, and the average value was calculated for each of the vertical and horizontal directions.
E = [(L−L ₀ ) / L ₀ ] × 100
Where E: elongation at break (%),
L ₀ : initial distance between marked lines (100 mm)
L: Distance (mm) between marked lines at the time of cutting.

(12) Tear strength JIS K 6404: 4 6. According to test method B (single tongue method), test specimens with a long side of 200 mm and a short side of 76 mm were taken on the vertical and horizontal sides, respectively, and 5 specimens were collected respectively, and the test piece was perpendicular to the center of the short side. A 75 mm incision was made and the specimen was torn at a gripping interval of 75 mm and a tensile speed of 200 mm / min until the test piece was pulled, and the tearing load at that time was measured. From the obtained chart recording line of the tearing load, three points were selected from the maximum points excluding the first peak in descending order, and the average value was taken. Finally, an average value was calculated for each of the vertical and horizontal directions.

(13) Flammability (FMVSS302)
It measured based on FMVSS302 method. Five test pieces each having a width of 102 mm and a length of 356 mm were prepared for each of the warp direction and the horizontal direction of the fabric, tested, and the burning rate was calculated from the following equation.
B = 60 × (D / T)
Where B: burning rate (mm / min)
D: Distance traveled by the flame (mm)
T: Time (seconds) required for the flame to travel Dmm
Among the burning speeds of 10 test pieces, the fastest value was set as the burning speed of this measurement.

(14) Storability (packability)
Measured according to ASTM D-385.

[Example 1]
(fabric)
Made of nylon 6,6, has a circular cross section, single fiber fineness 6.5 dtex, 72 filaments, total fineness 470 dtex, strength 8.5 cN / dtex, elongation 23.5%, untwisted synthetic fiber Multifilaments were used as warp and weft yarns.
Using the warp and weft yarns, weaving a plain fabric with a weft density of 46 / 2.54 cm, a weft density of 46 / 2.54 cm, and a cover factor of 1892 in a water jet loom. did. The basis weight of this woven fabric was 175 g / m ² , the thickness was 0.28 mm, the sliding resistance before the resin layer was provided was vertical 256N, width 183N, and the air permeability was 3.3 L / cm ² · min.

(Resin layer film)
A non-stretched film of 12.5 μm thick made of a block copolymer of PBT and polyether (“Hytrel” (registered trademark) SB654 (flexible type) manufactured by Toray DuPont), which is a thermoplastic resin having a melting point of 160 ° C. To form a film. Next, a modified polyolefin (“Admer” (registered trademark) SF715, manufactured by Mitsui Chemicals), which is a thermoplastic resin having a melting point of 125 ° C. and having a functional group introduced into the polyolefin, was formed into an unstretched film having a thickness of 12.5 μm. . These films were laminated to obtain a resin layer film.

(Thermo-compression process)
The above woven fabric and the above resin layer film are stacked so as to form a layer structure of “Hytrel” / “Admer” / woven fabric, at a roll temperature of 150 ° C., a roll pressure of 30 kg / cm, and a feed rate of 20 m / min. Then, thermocompression bonding was performed by a thermal laminating method.

  Table 1 shows the characteristics of the obtained airbag fabric. This airbag base fabric was excellent in low air permeability and storage property, and also in anti-missing property.

[Example 2]
(fabric)
The same one as used in Example 1 was used.

(Resin layer film)
A resin layer film was obtained in the same manner as in Example 1 except that the thicknesses of “Hytrel” / “Admer” were 5 μm and 7 μm, respectively.

(Thermo-compression process)
The above woven fabric and the above resin layer film were stacked so as to form a layer structure of “Hytrel” / “Admer” / woven fabric, and the same conditions as in Example 1 except that the roll pressure was 20 kg / cm. Thermocompression bonding was performed.

  Table 1 shows the characteristics of the obtained airbag fabric. This airbag base fabric was excellent in low air permeability and storage property, and also in anti-missing property.

[Example 3]
(fabric)
The same one as used in Example 1 was used.

(Resin layer film)
A resin layer film was obtained in the same manner as in Example 1 except that the thicknesses of “Hytrel” / “Admer” were 55 μm and 40 μm, respectively.

(Thermo-compression process)
The above woven fabric and the above resin layer film were stacked so as to form a layer structure of “Hytrel” / “Admer” / woven fabric, and the same conditions as in Example 1 except that the roll pressure was 20 kg / cm. Thermocompression bonding was performed.

  Table 1 shows the characteristics of the obtained airbag fabric. This airbag base fabric was excellent in low air permeability and storage property, and also in anti-missing property.

[Example 4]
(fabric)
The same one as used in Example 1 was used.

(Resin layer film)
A “Hytrel” similar to that used in Example 1 was formed into an unstretched film having a thickness of 12.5 μm to obtain a resin layer film.

(Thermo-compression process)
“Admer” similar to that used in Example 1 was melted at 150 ° C., extruded into a film having a thickness of 12.5 μm on the woven fabric, and the film was laminated thereon (the layer structure was “Hytrel” / “Admer” / woven fabric.) Without being wound once, thermocompression bonding was performed by an extrusion laminating method at a roll temperature of 150 ° C., a roll pressure of 20 kg / cm, and a feed rate of 40 m / min.

  Table 1 shows the characteristics of the obtained airbag fabric. This airbag base fabric was excellent in low air permeability and storage property, and also in anti-missing property.

[Example 5]
(fabric)
The same one as used in Example 1 was used.

(Resin layer film)
A thermosetting polyimide film having a thickness of 7.5 μm (“Kapton” (registered trademark) manufactured by Toray DuPont) was used as a laminated structure. Further, “Admer” similar to that used in Example 1 was formed into an unstretched film having a thickness of 12.5 μm. These films were laminated to obtain a resin layer film.

(Thermo-compression process)
The above woven fabric and the above resin layer film were laminated so as to have a layer structure of “Kapton” / “Admer” / woven fabric, and thermocompression bonded under the same conditions as in Example 1.

  Table 2 shows the characteristics of the obtained airbag fabric. This airbag base fabric was excellent in low air permeability and storage property, and also in anti-missing property.

[Example 6]
(fabric)
The same one as used in Example 1 was used.

(Thermo-compression process)
The same “Hytrel” as used in Example 1 was melted at 180 ° C., extruded into a film having a thickness of 25 μm on the above woven fabric, and without being wound once, a roll temperature of 180 ° C. and a roll pressure of 20 kg / Thermocompression bonding was performed by an extrusion laminating method at a cm and a feed rate of 20 m / min.

  Table 1 shows the characteristics of the obtained airbag fabric. This airbag base fabric was excellent in low air permeability and storage property, and also in anti-missing property.

[Comparative Example 1]
(fabric)
The same one as used in Example 1 was used.

(Resin layer film)
The same one as used in Example 1 was used.

(Thermo-compression process)
Example 1 except that the above woven fabric and the above resin layer film were layered to form a “Hytrel” / “Admer” / woven fabric layer, and the roll temperature was 110 ° C. and the roll pressure was 20 kg / cm. Thermocompression bonding was performed under the same conditions.

  Table 3 shows the characteristics of the obtained airbag fabric. The airbag fabric had a sliding resistance of 300 N or less, and could not suppress the opening of the sewing part when the airbag was used, and the sewing part was damaged when the bag was deployed.

[Comparative Example 2]
(fabric)
The same one as used in Example 1 was used.

(Resin layer film)
A resin layer film was obtained in the same manner as in Example 1 except that the thickness of “Hytrel” / “Admer” was 4 μm and 4 μm, respectively.

(Thermo-compression process)
The above woven fabric and the above resin layer film were stacked so as to form a layer structure of “Hytrel” / “Admer” / woven fabric, and the same conditions as in Example 1 except that the roll pressure was 20 kg / cm. Thermocompression bonding was performed.

Table 3 shows the characteristics of the obtained airbag fabric. This air bag base fabric has an air permeability of 0.5 L / cm ² · min or more and a sliding resistance of 300 N or less, and air leaks from the surface of the base fabric and the sewing portion when the bag is deployed, and catches the occupant. Only the internal pressure could not be obtained.

[Comparative Example 3]
(fabric)
The same one as used in Example 1 was used.

(Resin layer film)
A resin layer film was obtained in the same manner as in Example 1 except that the thicknesses of “Hytrel” / “Admer” were 55 μm and 50 μm, respectively.

(Thermo-compression process)
The above woven fabric and the above resin layer film were stacked so as to form a layer structure of “Hytrel” / “Admer” / woven fabric, and the same conditions as in Example 1 except that the roll pressure was 20 kg / cm. Thermocompression bonding was performed.

  Table 3 shows the characteristics of the obtained airbag fabric. The airbag fabric had a sliding resistance of 300 N or less, and could not suppress the opening of the sewing part when the airbag was used, and the sewing part was damaged when the bag was deployed. In addition, the storage property was poor, and the airbag storage work was difficult.

[Comparative Example 4]
(fabric)
The same one as used in Example 1 was used.

(Resin layer film)
A 12 μm thick thermosetting polyimide film (“Kapton” (registered trademark) manufactured by Toray DuPont) was used as a resin layer film.

(Thermo-compression process)
The same conditions as in Example 1 except that the above woven fabric and the above resin layer film were layered to form a “Kapton” / woven fabric layer and the roll temperature was 200 ° C. and the roll pressure was 20 kg / cm. And thermocompression bonded.

  The airbag fabric had a sliding resistance of 300 N or less, and could not suppress the opening of the sewing part when the airbag was used, and the sewing part was damaged when the bag was deployed.

[Comparative Example 5]
(fabric)
The same one as used in Example 1 was used.

(Resin layer film)
The same one as used in Example 1 was used.

(Thermo-compression process)
The above woven fabric and the above resin layer film are stacked so as to form a layer structure of “Hytrel” / “Admer” / woven fabric, and the roll temperature is 115 ° C., the roll pressure is 8 kg / cm, and the feeding speed is 90 m / min. Except for this, thermocompression bonding was performed under the same conditions as in Example 1.

  Table 3 shows the characteristics of the obtained airbag fabric. The airbag fabric had a sliding resistance of 300 N or less, and could not suppress the opening of the sewing part when the airbag was used, and the sewing part was damaged when the bag was deployed.

[Comparative Example 6]
(fabric)
The same one as used in Example 1 was used.

(Coating solution)
A solventless methyl vinyl silicone resin liquid, which is a thermosetting resin having a viscosity of 12 Pa · s (12,000 cP), was used as a coating liquid.

(Coating / Drying)
20 g / m ² of the above coating solution was applied to the above woven fabric in terms of elastomer resin using a floating knife coater. Subsequently, the coated fabric was dried in a pin tenter at 190 ° C. for 2 minutes.

  Table 4 shows the characteristics of the obtained airbag fabric. The airbag fabric had a sliding resistance of 300 N or less, and could not suppress the opening of the sewing part when the airbag was used, and the sewing part was damaged when the bag was deployed.

  The airbag fabric of the present invention can be suitably used particularly for a driver airbag, a passenger airbag, a side airbag, a curtain airbag, and the like, but the application range is not limited thereto. .

It is a top view of the base fabric for airbags which concerns on this invention. It is sectional drawing of the AA arrow of the base fabric of FIG.

Explanation of symbols

1 Airbag base fabric (present invention)
2 Textile 3 Warp Thread 4 Horizontal Thread 5 Resin Layer 6 Adhesive Layer 7 Surface Layer Both Ends of 8,8 'Thread A, B Cutting Line H Resin Layer Thickness

Claims (5)

A fabric layer and a resin layer containing a thermoplastic resin at least partially are laminated, and the sliding resistance measured according to ASTM D 6479-02 (2003) is 300 N or more, and the air permeability at an air pressure of 19.6 kPa is 0.5 L / A base fabric for an air bag characterized by having a cm ² · min or less. The airbag fabric according to claim 1, wherein the fabric is composed of multifilaments having a total fineness of 100 to 700 dtex. The airbag fabric according to claim 1 or 2, wherein a part of the resin layer reaches both ends of the warp yarn and the weft yarn of the woven fabric in the width direction. The airbag fabric according to any one of claims 1 to 3, wherein the combustion rate measured by FMVSS302 is 100 mm / min or less. It is a method of manufacturing the base fabric for airbags in any one of Claims 1-4, Comprising: The process of thermocompression-bonding the said resin layer on the said textile fabric at temperature higher than melting | fusing point of the thermoplastic resin which the said resin layer contains. The manufacturing method of the base fabric for airbags characterized by including these.