JP2009074215A - Coated fabric for airbag, airbag, and method for producing coated fabric for airbag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a substantial coated fabric for airbags which has mesh shift resistance necessary in deployment of an airbag, and to provide a method for producing the coated fabric. <P>SOLUTION: The coated fabric for airbags is produced by applying a resin coating to at least one surface of a woven fabric composed of a fiber having a single fiber fineness of 1-4.8 dtex, a thickness of 0.31 mm or less, a fabric weight of 235 g/m<SP>2</SP>or less, an air permeability of 0.1 L/cm<SP>2</SP>/min or less determined by Frazier method at a test pressure difference of 19.6 kPa, and a slippage resistance in warp and weft directions of 250 N or more and further satisfies the following formula: ER5%(warp)+ER5%(weft)≥300E, wherein R5% is the tenacity at 5% elongation of the fabric in the measurement of the slippage resistance in conformity to ASTM D6479-02. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an airbag fabric. More specifically, the present invention relates to a coated fabric for an airbag in which a resin is coated on at least one surface thereof.

  Airbag fabrics used for airbags can be broadly classified into non-coated airbag fabrics that are used without applying resin on the fabric surface, and airbag coated fabrics that are used by applying resin to the fabric surface.

  Among these, the coated fabric for airbag is suitably used for applications (parts) that need to maintain the internal pressure of the bag for a long time, such as side airbags and curtain airbags, in that low air permeability is easily obtained.

  The required performances for airbag fabrics include low breathability, mechanical properties, storage properties, etc., but the requirements for anti-missing properties are becoming stricter. In airbags obtained by cutting and sewing airbag fabrics, the misalignment of the seams when the airbag is deployed is called misalignment. 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. Further, in the case of a coated fabric, since there is no air leakage from the surface of the fabric, the air concentrates on the sewn portion, so that the anti-missing property becomes more important.

  For example, a high-density airbag fabric having a cover factor of 2300 to 2600 has been proposed as means for reducing the misalignment of the sewing portion (Patent Document 1). However, although this technique relates to a non-coated fabric, there is a problem that even when this high-density woven fabric is applied to a coated fabric, the fabric is thick and hinders storage.

  On the other hand, in order to achieve both low air permeability and storage, a synthetic fiber fabric made of yarns having a single yarn fineness of warp and weft of 4.4 denier (≈4.9 dtex) and a total fineness of 315 denier (≈350 dtex) A coated fabric for an air bag in which a silicone resin is applied is disclosed (see Patent Document 2). However, this airbag coated fabric was not recognized as being coated under special conditions, and thus was considered to have a low resistance to sliding and easily cause misalignment.

Furthermore, in order to suppress misalignment in addition to low air permeability and storage, a coated fabric for an airbag in which a synthetic resin is applied to at least one side of a woven fabric having a ripstop structure is also disclosed (see Patent Document 3). However, in this technique, since the fabric is not uniform, stress is concentrated on a weak portion of the fabric when the airbag is inflated and deployed, and the airbag may be damaged. There was also the problem of poor productivity.
JP 2006-16707 A (Claim 1) JP 1998-194063 A (Claim 1, paragraph 0013) JP 2006-291396 A (Claim 1)

  An object of the present invention is to provide a substantially coated fabric for an airbag having a resistance to misalignment required when the airbag is deployed.

In order to solve the above problems, the present invention employs any one of the following means.
(1) A resin is coated on at least one side of a woven fabric made of fibers having a single fiber fineness in the range of 1 to 4.8 dtex, and has a thickness of 0.31 mm or less, a basis weight of 235 g / m ² or less, based on the Frazier method. The air flow when measured at a test differential pressure of 19.6 kPa is 0.1 L / cm ² / min or less, the slipping resistance in the warp direction and the weft direction is 250 N or more, respectively, and the following formula is satisfied: A coated fabric for an airbag.
ER5% (longitude) + ER5% (longitude) ≥ 300N
ER5%: in the measurement of sliding resistance according to ASTM D6479-02, the strength at the time of 5% elongation of the woven fabric (2) The cover factor calculated from the following formula of the woven fabric is 1600-2500, Airbag coat fabric.
Cover factor = ((total warp fineness) × 0.9) ^1/2 × (warp weave density) + ((weft total fineness) × 0.9) ^1/2 × (weft weave density)
(3) The coated fabric for an airbag according to (1) or (2), wherein the adhesion amount of the resin is 5 to 40 g / m ² .
(4) An airbag obtained by sewing the airbag coated fabric according to any one of (1) to (3).
(5) A method for producing a coated fabric for an airbag according to any one of (1) to (4), wherein the fabric is coated while being conveyed along a support having corners. A method for producing a coated fabric for an airbag.
(6) The manufacturing method of the coated fabric for airbags as described in said (5) whose said support body is a bedboard or a knife-like thing.
(7) The support is a bedboard, the angle formed by the bedboard and the fabric is in the range of 40 to 80 degrees, and the tension of the fabric during coating is in the range of 500 to 3000 N / m. The manufacturing method of the coated fabric for airbags as described in said (6) which is inside.
(8) The method for producing a coated fabric for an airbag according to any one of (5) to (7), wherein weaving is performed by adjusting a warp tension to 50 to 230 cN / piece during weaving of the woven fabric.
(9) The method for producing a coated fabric for an airbag according to any one of (5) to (8), wherein a bar temple is used when the woven fabric is woven.

  ADVANTAGE OF THE INVENTION According to this invention, it can provide the coating fabric for airbags which has the outstanding low air permeability, storage property, and a mechanical characteristic, and also was excellent in the anti-missing property. In particular, the woven fabric is composed of fibers composed of single fibers having a fineness of 1 to 4.8 dtex, and the woven fabric is coated with a resin while being conveyed along a support having a corner such as a bedboard. Thus, the sum of the warp and weft when the fabric is stretched by 5% at the time of sliding resistance measurement (ER 5%) can be set to 300 N or more while dramatically improving the sliding resistance. For this reason, when the airbag is used, even if the sewing portion receives the internal pressure applied in the initial stage of deployment, damage and misalignment are unlikely to occur, and air leakage can be prevented.

  The coated fabric for airbag of the present invention has a woven fabric made of fibers. As a fiber material, for example, synthetic fibers such as polyamide fibers, polyester fibers, aramid fibers, rayon fibers, polysulfone fibers, and ultrahigh molecular weight polyethylene fibers can be used. Of these, polyamide fibers and polyester fibers excellent in mass productivity and economy are preferable.

  Examples of polyamide fibers include nylon 6, nylon 66, nylon 12, nylon 46, copolymer polyamide of nylon 6 and nylon 66, and copolymer obtained by copolymerizing nylon 6 with polyalkylene glycol, dicarboxylic acid, amine, and the like. Mention may be made of fibers made of polyamide or the like. Nylon 6 fiber and nylon 66 fiber are particularly excellent in impact resistance and are preferable.

  Examples of the polyester fiber include fibers made of polyethylene terephthalate, polybutylene terephthalate, and the like. It may be a fiber made of a copolymerized polyester obtained by copolymerizing polyethylene terephthalate or polybutylene terephthalate with an aliphatic dicarboxylic acid such as isophthalic acid, 5-sodium sulfoisophthalic acid or adipic acid as an acid component.

  Synthetic fibers also have thermal stabilizers, antioxidants, light stabilizers, smoothing agents, antistatic agents, plasticizers, thickeners to improve productivity and properties in the spinning / drawing process and processing process. Additives such as additives, pigments, and flame retardants may be included.

  Moreover, as a cross-sectional shape of the single fiber constituting the woven fabric, a flat cross section is also preferable in addition to the round cross section. By using flat cross-section fibers, fiber filling when woven is promoted, the gap between single fibers in the woven fabric is reduced, and if the same woven structure, than when using round cross-section yarn of the same fineness Aeration volume can be suppressed. As for the shape of the flat cross section, when the cross section of the single fiber is approximated to an ellipse, the flatness defined by the ratio (D1 / D2) of the major axis (D1) to the minor axis (D2) is 1.5-4. It is preferable that it is, More preferably, it is 2.0-3.5. Such a flat cross-sectional shape may be a geometrically true elliptical shape, for example, a rectangular shape, a rhombus shape, and a saddle shape, and may be a left-right symmetric shape or a left-right asymmetric shape. Moreover, the thing of the shape which combined these may be sufficient. Furthermore, with the above as a basic shape, there may be a protrusion, a dent, or a partially hollow portion.

  For both the warp and the weft constituting the woven fabric, it is preferable to use a synthetic fiber filament having a relatively low fineness having a single fiber fineness of 1 dtex or more and 4.8 dtex or less. It is because a synthetic filament can be manufactured without giving a special device by setting it as 1 dtex or more, and the softness | flexibility of a synthetic fiber filament improves by setting it as 4.8 dtex or less. The single fiber fineness is more preferably 1.5 dtex or more and 4.0 dtex or less, and further preferably 2.0 dtex or more and 3.5 dtex or less. When the single fiber fineness is within these more limited ranges, voids between the single fibers in the woven fabric tend to be small, and the fiber filling effect is further improved. Moreover, since the effect which reduces the rigidity of a synthetic filament is acquired by setting a single fiber fineness to said low range, the stowability of an airbag improves and it is preferable. Furthermore, by using weaving conditions under certain conditions, such as weaving with increased warp tension as described later, the stability of the fabric structure between the warp and weft is dramatically improved, and anti-deviability Can be significantly improved.

  The total fineness of warp and weft is preferably 100 to 700 dtex. By setting it to 100 dtex or more, the strength of the fabric can be increased. Moreover, the compactness at the time of accommodation can be improved by setting it as 700 dtex or less. The total fineness is more preferably 200 to 600 dtex, and further preferably 300 to 500 dtex. By setting the fineness within this range, the strength, flexibility and compact storage property of the fabric can be improved in a balanced manner.

  Further, the tensile strength of the single fibers constituting the warp and the weft is 8.0 to 9.9 for both the warp and the weft in order to satisfy the mechanical properties required as a coated fabric for an air bag and from the viewpoint of yarn production. 0 cN / dtex is preferable, and 8.3 to 8.7 cN / dtex is more preferable.

  The cover factor of the fabric is preferably 1600 or more and 2500 or less. By adjusting the cover factor within this range, it is possible to achieve both necessary compact storage capacity and slip resistance. If the cover factor is smaller than 1600, the compact storability is improved, but the tensile strength and sliding resistance are reduced, which is not preferable. On the other hand, when the cover factor is larger than 2500, the sliding resistance is increased, but the compact storage property is lowered, which is not preferable.

Here, the cover factor of the woven fabric is a value calculated from the total fineness and woven density of the fibers used for the warp and the weft. The warp total fineness (dtex), the total weft fineness (dtex), and the weft of the warp in the woven fabric. It is expressed by the following formula depending on the density (main / 2.54 cm) and the weave density of the weft in the woven fabric (main / 2.54 cm).
Cover factor = ((total warp fineness) × 0.9) ^1/2 × (warp weave density) + ((weft total fineness) × 0.9) ^1/2 × (weft weave density)
The coated fabric for an airbag according to the present invention is formed by coating at least one surface of a woven fabric as described above with a resin. The coated fabric has a thickness of 0.31 mm or less and a basis weight of 235 g / m ² or less. By satisfying the thickness and weight per unit area, the coated airbag fabric is light and excellent in storability.

  The slip resistance in the warp direction and the weft direction of the coated fabric is 250 N or more. In order for the airbag of each part to continue to receive the occupant after inflating and deploying, it is necessary to suppress the misalignment of the sewing portion of the airbag as much as possible and maintain the bag internal pressure. is important. If it is less than 250 N, misalignment of the sewing portion is likely to occur, and the internal pressure of the airbag cannot be sufficiently maintained. The sliding resistance is more preferably 300N or more, and further preferably 350N or more. The slip resistance is an index representing the difficulty of misalignment, and is measured according to ASTM D6479-02.

  In addition, in the measurement of sliding resistance by ASTM D6479-02, it is important that the sum of the warp and weft when the fabric is stretched 5% (hereinafter referred to as ER 5%) is 300 N or more. If it is less than 300 N, when the sewing part receives the internal pressure applied at the initial stage of airbag deployment, the force cannot be relieved by the sewing part, and it may rupture due to large misalignment, It may become large and burst when hot air escapes intensively from that part. The sum of the ER 5%, the latitude and the latitude is more preferably 350N or more, and further preferably 400N or more.

  Further, when the sliding resistance is measured, if the fabric breaks without stretching by 5%, the sliding resistance is preferably 300 N or more in terms of energy absorption.

  In order to make the sliding resistance and the strength at 5% elongation of the fabric as described above, the bedboard is formed on at least one side of the fabric composed of fibers having a single fiber fineness of 1 to 4.8 dtex. It is effective to coat the resin while using a support having an equiangular angle. First, let us consider the mechanism by which the slip resistance in the warp and weft directions of the coated fabric using the fibers having a small single fiber fineness is increased with respect to the coated fabric using the fibers having a large single fiber fineness. Since the fabric having a smaller single fiber fineness has more contact points between the fibers than the fabric having a larger single fiber fineness, the sliding resistance is improved. In addition, when coated, a fabric with a small single fiber fineness has a large fiber surface area, resulting in a large contact area with the coating resin and increased frictional resistance compared to a fabric with a large single fiber fineness. Will improve. By these two effects, it is speculated that the slip-off resistance of the coated fabric having a small single fiber fineness is remarkably improved.

  And in this invention, when coating resin with a textile fabric, the support body which has an angle | corner, such as a bed board, is used. A cylindrical roll is usually installed immediately before coating, but if a support having a corner such as a bedboard is placed immediately before a coating knife or the like, the fabric is strongly rubbed against the support, so the fibers constituting the fabric The resin can be applied in a state of fully spreading. As a result, in the coated fabric, the contact area between the warp and weft single fibers increases, the frictional resistance increases, the sliding resistance increases, and the sum of the warp and weft of ER 5% also increases. Moreover, since it becomes smoother and thinner also as a textile fabric, a storage property can also be improved.

  The support having corners may be any substance having corners that can substantially apply local pressure to the fabric during coating, and the corner angles are not limited. A bed board and a knife-like thing can be illustrated. The bed board refers to a plate-like support, and for the shape of the plate-like support, a cross section (cross section in the running direction of the woven fabric) having a rectangular parallelepiped shape, a T shape, a kanji shape, or the like is used. A knife-like object is preferable when it is necessary to iron the fabric more strongly.

  When using the bedboard, the angle between the bedboard and the fabric is 40 to 80 degrees, the contact pressure with the knife against the fabric is 1 to 15 N / cm, and the fabric tension during coating is 500 to 3000 N / m. When it is within the range, since the woven fabric is coated in a high tension state, elongation of the coated fabric is suppressed, and ER 5% can be further increased.

In the present invention, the coated fabric has an air flow rate of 0.1 L / cm ² · min when measured at a test differential pressure of 19.6 kPa based on the Frazier method defined by JIS L 1096: 1999 8.27.1 A method. It is also necessary that: By adjusting the ventilation amount to the above range, the inflation gas emitted from the inflator at the time of collision can be used effectively without leakage, and the occupant can be reliably received.

  Furthermore, the coated fabric for an airbag of the present invention is JIS K 6404-3. The tensile strength based on the strip method defined by the test method B method is preferably 400 N / cm or more. More preferably, it is 500 N / cm or more, More preferably, it is 550 N / cm or more. When the airbag is damaged due to the fabric strength during the operation of the airbag, the stress tends to be concentrated and damaged at the lowest strength portion. In other words, if the minimum strength of the fabric satisfies the required strength, breakage can be prevented. Further, the intensity bias does not affect the deployment of the airbag. Furthermore, the tensile elongation is determined by the elongation characteristics of the synthetic filament yarn used, and is not greatly affected by the weave density. Therefore, the isotropy of the strength in the warp direction and the weft direction of the fabric is not important, and the minimum value when the tensile strength is measured at an arbitrary place should satisfy the above range.

  The coated fabric for airbag in the present invention requires that at least one surface of the woven fabric is coated with a resin such as silicone. By covering at least one surface with a resin, it is possible to provide air barrier properties and further protect the fabric from high-temperature gas generated from the inflator.

  In addition, a polyamide resin, a polyurethane resin, or the like can be used as the resin for covering the fabric, but a silicone resin is preferably used. By using a silicone resin, heat resistance, cold resistance, flame retardancy, and air barrier properties can be obtained. For such silicone resins, dimethyl silicone resins, methyl vinyl silicone resins, methyl phenyl silicone resins, and fluoro silicone resins are used. Further, the resin preferably contains a flame retardant compound. Such flame retardant compounds include halogen compounds containing bromine, chlorine, etc., especially halogenated cycloalkanes, platinum compounds, antimony oxides, copper oxides, titanium oxides, phosphorus compounds, thiourea compounds, carbon, cerium, silicon oxide, etc. Among these, halogen compounds, platinum compounds, copper oxide, titanium oxide, and carbon are more preferable.

  Such a resin preferably has a viscosity during film formation in the range of 5 to 20 Pa · s (5,000 to 20,000 cP) for uniform application amount and stable application. Although the viscosity may be adjusted by diluting with a solvent, it is preferable from the viewpoint of workability and reduction of environmental burden to use a solvent-free type resin that has been adjusted to a viscosity in the above range from the beginning. In addition, about the viscosity of resin, the viscosity when measured with a B-type viscometer based on JISZ8803 is said. If the viscosity is less than 5 Pa · s (5,000 cP), the viscosity is too low to be suitable for knife coating. On the other hand, when it is larger than 20 Pa · s (20,000 cP), coating with a low coating amount cannot be performed, which is not preferable in terms of compact storage.

Moreover, it is preferable that the adhesion amount of this resin is 5-40 g / m < ² >. By adjusting the adhesion amount within this range, the compact storage capacity, low air permeability, and sliding resistance of the fabric can be improved in a balanced manner. When the adhesion amount of the resin is less than 5 g / m ² , it is difficult to uniformly apply the resin covering the fabric surface, and the air flow rate of the fabric tends to increase. As a result, it becomes difficult to maintain an internal pressure sufficient to restrain the occupant during a collision. On the other hand, when the adhesion amount is larger than 40 g / m ² , a fabric excellent in heat resistance and mechanical properties can be obtained, but since the compact storage property is lacking, it is stored in a limited space that is simply built in the airbag module. It is preferable. Further, it is not preferable in terms of cost performance. The amount of adhesion is particularly preferably in the range of 10 to 30 g / m ² from the balance between passenger restraint and storage.

  Next, a method for producing the coated fabric for an airbag according to the present invention will be described.

  The coated fabric for an airbag of the present invention is woven by using the same type of synthetic fiber filament yarn for warp and weft, for example, and setting the same weave density. Specifically, first, the warp of the material and the total fineness described above is warped and applied to a loom, and the weft is similarly prepared. Such a loom is not particularly limited, and a water jet room, an air jet room, a rapier room, and the like can be used. In particular, in order to increase productivity, it is preferable to use a water jet loom which is relatively easy to weave at high speed.

  In weaving, it is preferable to adjust the warp tension to 50 to 230 cN / piece. By adjusting the warp tension within such a range, the gap between single fibers in the yarn bundle of the multifilament yarn constituting the woven fabric can be reduced, and the air flow rate can also be reduced. In addition, after the weft is driven, the warp to which the tension is applied pushes and bends the weft, thereby obtaining an effect of increasing the fabric binding force in the weft direction. Thereby, the anti-missing property of the fabric is improved, and air leakage due to misalignment of the sewing portion when forming a bag as an airbag can be suppressed, which is preferable. When the warp tension is less than 50 cN / line, the contact area (adhesion degree) of the warp and weft in the woven fabric cannot be increased, and the slip resistance is difficult to increase. Further, since the effect of reducing the gap between the single fibers is small, it is not preferable in terms of low air permeability. Further, if it exceeds 230 cN / line, the contact area (adhesion degree) between the warp and the weft can be increased, the slip resistance can be improved, the gap between single fibers is reduced, and this is preferable in terms of low air permeability. This is not preferable because warp yarns are easily fluffed and weaving properties are likely to deteriorate. The warp tension is more preferably 100 to 200 cN / line.

  Specific methods for adjusting the warp tension within the above range include adjusting the weft driving speed in addition to adjusting the warp feed speed of the loom. Whether the warp tension is actually generated during weaving can be confirmed, for example, by measuring the tension applied per warp at the center of the warp beam and the back roller with a tension measuring instrument while the loom is running. Can do.

  It is preferable to use a bar temple as the loom temple. When the bar temple is used, it can be beaten while gripping the entire pre-weaving, so that the gap between the fiber filaments can be reduced, and as a result, the low air flow rate and the anti-missing property are improved.

  Next, when the weaving process is finished, processing such as scouring and heat setting is performed as necessary.

In the coated fabric for an airbag of the present invention, a resin is applied to at least one surface of the woven fabric. As the resin coating method, the knife coating method is preferable from the viewpoint of reducing the coating amount of the resin and stable coating. 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 more preferably used from the viewpoint of reducing the amount of resin applied and the resin permeability to the fabric.
When coating is performed, as shown in FIG. 1, a support body having corners such as a bedboard 2 is used as described above. When the bedboard is used, the fabric tension is in the range of 500 to 3000 N / m so that the angle θ between the bedboard 2 and the fabric 1 is in the range of 40 to 80 degrees. It is preferable to apply the coating. By placing a support having a corner such as a bedboard on the upstream side of the coating knife, and carrying the coating while carrying the fabric along the support, the corner and the fabric tension formed with the fabric are further within these ranges. Since the fabric is strongly rubbed against the bedboard, the yarn bundle is deformed, and fixing in that state increases the contact area between the warp and the weft, thereby improving the slip resistance and ER5%. It becomes a smooth fabric.

  Moreover, it is also preferable to make the contact pressure of the knife 3 with respect to the fabric within a range of 1 to 15 N / cm after the tension of the fabric 1 is within a range of 500 to 3000 N / m. By coating the contact pressure and fabric tension within the above ranges, the yarn bundle can be fixed in a deformed state, the resin can be applied more uniformly, and the impregnation of the resin into the fabric can be minimized. You can also As a result, flexibility and storage compactness are also improved.

  The airbag of the present invention is obtained by sewing the above-mentioned airbag coated fabric into a bag shape and attaching attached devices such as an inflator. The airbag of the present invention can be used for a driver's seat, a passenger seat, a rear seat, a side airbag, and the like. It is particularly suitable for use as a driver's seat or passenger's seat airbag requiring a large restraining force.

  Next, the present invention will be described in more detail with reference to examples. In addition, the following were used as a measurement and evaluation method of the obtained coated fabric.

[Measuring method]
(1) Thickness of the coated fabric 10 seconds in order to calm the thickness under a pressure of 23.5 kPa using a thickness measuring machine at five different points of the sample according to JIS L 1096: 1999 8.5. After waiting, the thickness was measured and the average value was calculated.

(2) Woven density of warp and weft Measured based on JIS L 1096: 1999 8.6.1. The sample was placed on a flat table, and the number of warp and weft yarns in a 2.54 cm section was counted at five different locations, excluding unnatural wrinkles and tension, and the average value was calculated.

(3) Fabric weight and coated fabric weight In accordance with JIS L 1096: 1999 8.4.2, three test pieces of 20 cm × 20 cm were sampled, each mass (g) was measured, and the average value per m ² Expressed in mass (g / m ² ).

(4) Amount of coating A blank sample was prepared under the same conditions except that no resin was applied. According to the above (3), the basis weight of the blank sample was measured, and the difference between the basis weight of the coated fabric and the basis weight of the blank sample was determined as the coating amount.

  In addition, in order to calculate the coat amount only from the coated fabric because a blank sample cannot be prepared, the weight of the fabric after dissolving the resin using a chemical corresponding to the coated resin and dissolving the resin from the original coated fabric weight Is subtracted and the value is divided by the area of the coated fabric.

(5) Tensile strength of coated fabric JIS K 6404-3 In accordance with test method B (strip method), for each of the warp direction and the weft direction, five test pieces were collected, the yarn was removed from both sides of the width to a width of 30 mm, and a constant speed tension type testing machine, The test piece was pulled at a grip interval of 150 mm and a tensile speed of 200 mm / min until the maximum load until cutting was measured, and the average value was calculated for each of the warp direction and the weft direction.

(6) Breaking elongation of coated fabric JIS K 6404-3 In accordance with test method B (strip method), for each of the warp direction and the weft direction, five test pieces are sampled, the thread is removed from both sides of the width to a width of 30 mm, and 100 mm intervals are provided at the center of these test pieces. With a marked line, with a constant-speed tension type testing machine, pull until the specimen is cut at a grip interval of 150 mm and a pulling speed of 200 mm / min, read the distance between the marked lines when reaching the cutting, The breaking elongation was calculated, and the average value was calculated for each of the warp direction and the weft direction.
E = [(L-100) / 100] × 100
Where E: elongation at break (%)
L: Distance between marked lines when cutting (mm)
(7) Tear strength of coated fabric JIS K 6404-4 In accordance with test method B (single tongue method), five test pieces are taken for both the long side of 200 mm and the short side of 76 mm, and both sides and wefts, and perpendicular to the side at the center of the short side of the test piece. A 75 mm incision was made, and the specimen was torn with a constant speed tension type tester at a grip interval of 75 mm and a tensile speed of 200 mm / min until the specimen was pulled, and the tear 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, average values were calculated for each of the warp direction and the weft direction.

(8) Airflow rate of coated fabric The airflow rate when tested at a test differential pressure of 19.6 kPa was measured according to JIS L 1096: 1999 8.27.1 Method A (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.

(9) Packability According to ASTM D-6478, three test pieces were collected and measured, and the average value was calculated.

(10) Sliding resistance in coated fabric According to ASTM D6479-02, five test pieces were sampled and measured for each of the warp direction and the weft direction, and the average value was calculated.

(11) ER5%
In accordance with ASTM D6479-02, five specimens were taken for each of the warp direction and the weft direction, and each of the five specimens was gripped with a constant-speed tension type testing machine at a grip interval of 200 mm and tensile. The test piece was pulled at a speed of 200 mm / min until the test piece was cut, and the elongation of the fabric was calculated from the amount of change in the holding interval. In the FS curve obtained from them, the average value of the strength at 5% elongation of the woven fabric was calculated for each of the warp direction and the weft direction, and then the sum of the warp direction and the weft direction was calculated.

(12) Warp tension during weaving Using Checkmaster (registered trademark) (model: CM-200FR) manufactured by Kanai Koki Co., Ltd., during the operation of the loom, between the warp beam and the back roller, The applied tension was measured.

(13) Resin viscosity during coating The viscosity was measured with a B-type viscometer based on JIS Z8803.

(14) Comprehensive Evaluation Criteria In Table 2, which will be described later, the value of the slip resistance force of the process obtained by the above measuring method satisfies 250N or more and ER5% satisfies 300 or more, either “○” is satisfied. The case where it did not do was evaluated as "x".

[Example 1]
(Warp and weft)
The warp / weft is made of nylon 6/6, and is composed of single filament 136 filament having a circular cross-sectional shape of 2.57 dtex, a total fineness of 350 dtex, a strength of 8.5 cN / dtex, and an elongation of 23. 5% untwisted synthetic fiber filaments were used.

(Weaving process)
A woven fabric having a weaving density of 54 warps and 2.54 cm of warps and wefts was woven in the water jet loom using the above warps and wefts. At that time, a bar temple was installed between the beating portion and the friction roller to grip the fabric, the warp tension was adjusted to 130 cN / piece, and the loom rotation speed was 500 rpm.

(Scouring and setting process)
Next, this fabric is scoured and dried by a normal method, and subsequently subjected to a heat setting process at 160 ° C. for 1 minute using a pin tenter dryer under the dimensional regulation with a width insertion rate of 0% and an overfeed rate of 0%. gave.

(Coating process)
Next, this fabric was subjected to a solvent-free methylvinylsilicone resin solution having a viscosity of 12 Pa · s (12,000 cP) in a facility in which a bed board was installed in front of the floating knife by a floating knife coater using a sword knife. After the coating is performed so that the contact pressure between the woven fabric and the plate knife is 10 N / cm and the resin adhesion amount is 20 g / m ² , vulcanization treatment is performed at 190 ° C. for 1 minute, and the coating for the airbag A fabric was obtained.

  Table 1 shows the characteristics of the obtained airbag coated fabric. As shown in Table 1, this airbag coat fabric was excellent in low air permeability and slip-off resistance, and satisfied the target value. Moreover, the compactness at the time of storage was also excellent.

[Comparative Example 1]
(Warp and weft)
The warp and weft are made of nylon 6/6, and are composed of 72 single filaments with a circular cross-sectional shape of 4.86 dtex, a total fineness of 350 dtex, a strength of 8.5 cN / dtex, and an elongation of 23. 4%, untwisted synthetic fiber filaments were used.

(Weaving process)
Using the above warp and weft, weaving was performed under the same conditions using the same water jet loom as in Example 1.

(Scouring and setting process)
Subsequently, the same scouring and setting process as in Example 1 was performed on the woven fabric.

(Coating process)
Next, a solvent-free methyl vinyl silicone resin liquid having a viscosity of 12 Pa · s (12,000 cP) was applied to the woven fabric using the same coating equipment as in Example 1, and the contact pressure between the woven fabric and the plate knife was 10 N / The coating was carried out so that the resin adhesion amount was 20 g / m ² , and then vulcanized at 190 ° C. for 1 minute to obtain a coated fabric for an airbag.

  Table 1 shows the characteristics of the obtained airbag coated fabric. This airbag coated fabric has no problem with low air permeability and storage properties, but has low slip resistance in the weft direction and does not satisfy ER 5%.

[Example 2]
(Warp and weft)
The warp / weft is made of nylon 6/6 and is composed of single filament 136 filament having a circular cross-sectional shape of 3.46 dtex, a total fineness of 470 dtex, a strength of 8.6 cN / dtex, and an elongation of 23. 4%, untwisted synthetic fiber filaments were used.

(Weaving process)
Using the above-described warp and weft, the same water jet loom as in Example 1 was used to weave a woven fabric having a weft density of 43 warps / 2.54 cm. At that time, a bar temple was installed between the beating portion and the friction roller to grip the fabric, the warp tension was adjusted to 150 cN / piece, and the loom rotation speed was 500 rpm.

(Scouring and setting process)
Subsequently, the same scouring and setting process as in Example 1 was performed on the woven fabric.

(Coating process)
Next, a solventless methylvinylsilicone resin solution having a viscosity of 12 Pa · s (12,000 cP) was applied to this fabric using the same coating equipment as in Example 1, and the contact pressure between the fabric and the board knife was 12 N / The coating was performed so that the resin adhesion amount was 15 g / m ² , and vulcanization treatment was performed at 190 ° C. for 1 minute to obtain a coated fabric for an airbag.

  Table 1 shows the characteristics of the obtained airbag coated fabric. This airbag coated fabric satisfied the target values in terms of low air permeability and sliding resistance. Moreover, the compactness at the time of storage was also excellent.

[Comparative Example 2]
(Warp and weft)
The warp / weft is made of nylon 6/6 and is composed of single filament 136 filament having a circular cross-sectional shape of 3.46 dtex, a total fineness of 470 dtex, a strength of 8.6 cN / dtex, and an elongation of 23. 4%, untwisted synthetic fiber filaments were used.

(Weaving process)
Using the warp and weft, weaving was performed under the same conditions using the same water jet loom as in Example 2.

(Scouring and setting process)
Subsequently, the same scouring and setting process as in Example 2 was performed on the woven fabric.

(Coating process)
Next, a solventless methylvinylsilicone resin solution having a viscosity of 12 Pa · s (12,000 cP) was applied to the woven fabric using a floating knife coater using a sword knife with the same equipment as in Example 1 except that no bedboard was used. The coating pressure was kept at 0.9 N / cm and the resin adhesion amount was 30 g / m ² , followed by vulcanization treatment at 190 ° C. for 1 minute, A coated fabric for bags was obtained.

  Table 1 shows the characteristics of the obtained airbag coated fabric. This air bag coated fabric had no problem in low air permeability and storage properties, but did not satisfy the target value in slip resistance, ER 5%, despite the increase in the amount of resin adhered.

[Example 3]
(Warp and weft)
The warp / weft is made of nylon 6/6 and is composed of single filament 136 filaments with a circular cross section of 3.46 dtex, a total fineness of 470 dtex, a strength of 8.6 cN / dtex, and an elongation of 23. 4%, untwisted synthetic fiber filaments were used.

(Weaving process)
Using the above-described warp and weft, the same water jet loom as in Example 2 was used to weave a woven fabric having a weft density of 46 warps / 2.54 cm. At that time, a bar temple was installed between the beating portion and the friction roller to grip the fabric, the warp tension was adjusted to 150 cN / piece, and the loom rotation speed was 500 rpm.

(Scouring and setting process)
Subsequently, the same scouring and setting process as in Example 2 was performed on the woven fabric.

(Coating process)
Next, a solventless methylvinylsilicone resin solution having a viscosity of 12 Pa · s (12,000 cP) was applied to this fabric using the same coating equipment as in Example 1, and the contact pressure between the fabric and the board knife was 12 N / The coating was carried out so that the resin adhesion amount was 20 g / m ² , and then vulcanized at 190 ° C. for 1 minute to obtain a coated fabric for an airbag.

  Table 1 shows the characteristics of the obtained airbag coated fabric. This coated fabric for airbags satisfied target values in terms of low air permeability and sliding resistance. Moreover, the storage compactness was also excellent.

[Example 4]
(Warp and weft)
The warp / weft is made of nylon 6/6 and is composed of single filament 136 filaments with a circular cross section of 3.46 dtex, a total fineness of 470 dtex, a strength of 8.6 cN / dtex, and an elongation of 23. 4%, untwisted synthetic fiber filaments were used.

(Weaving process)
Using the above-described warp and weft, the same water jet loom as in Example 2 was used to weave a woven fabric having a weft density of 50 warps and wefts / 2.54 cm. At that time, a bar temple was installed between the beating portion and the friction roller to grip the fabric, the warp tension was adjusted to 150 cN / piece, and the loom rotation speed was 500 rpm.

(Scouring and setting process)
Subsequently, the same scouring and setting process as in Example 2 was performed on the woven fabric.

(Coating process)
Next, a solventless methylvinylsilicone resin solution having a viscosity of 12 Pa · s (12,000 cP) was applied to this fabric using the same coating equipment as in Example 1, and the contact pressure between the fabric and the board knife was 12 N / The coating was carried out so that the resin adhesion amount was 20 g / m ² , and then vulcanized at 190 ° C. for 1 minute to obtain a coated fabric for an airbag.

  Table 1 shows the characteristics of the obtained airbag coated fabric. This airbag coated fabric sufficiently satisfied the target values in terms of low air permeability and sliding resistance.

[Comparative Example 3]
(Warp and weft)
The warp / weft is made of nylon 6/6 and is composed of single filament 136 filaments with a circular cross-sectional shape of 3.46 dtex, a total fineness of 470 dtex, a strength of 8.5 cN / dtex, and an elongation of 23. 6% untwisted synthetic fiber filaments were used.

(Weaving process)
Using the above warp and weft, weaving was performed under the same conditions using the same water jet loom as in Example 4.

(Scouring and setting process)
Subsequently, the same scouring and setting processing as in Example 4 was performed on the woven fabric.

(Coating process)
Next, a solvent-free methyl vinyl silicone resin liquid having a viscosity of 12 Pa · s (12,000 cP) was applied to this woven fabric using the same coating equipment as in Example 1, and the contact pressure between the woven fabric and the plate knife was 4 N / The coating was carried out so that the resin adhesion amount was 45 g / m ² , and then vulcanized at 190 ° C. for 1 minute to obtain a coated fabric for airbag.

  Table 1 shows the characteristics of the obtained airbag coated fabric. This airbag coating fabric had no problem with sliding resistance, but had a problem with ER 5% and storage compactness.

  The coated fabric for airbag of the present invention combines the excellent low air permeability required for the coated fabric for airbag and the compactness at the time of storage, and is also excellent in slip resistance. Therefore, the coated fabric for an airbag of the present invention can be suitably used particularly for a driver seat, a passenger seat, a side airbag for a side collision, and the like, but the application range is not limited thereto.

It is a schematic diagram which shows the manufacturing process of the coated fabric for airbags which shows one embodiment of this invention.

Explanation of symbols

1 Textile 2 Bedboard 3 Knife

Claims (9)

Resin is coated on at least one side of a woven fabric composed of fibers having a single fiber fineness in the range of 1 to 4.8 dtex, the thickness is 0.31 mm or less, the basis weight is 235 g / m ² or less, the test difference based on the Frazier method An air bag characterized in that the air flow rate measured at a pressure of 19.6 kPa is 0.1 L / cm ² / min or less, the slipping resistance in the warp direction and the weft direction is 250 N or more, respectively, and satisfies the following formula: Coated fabric.
ER5% (longitude) + ER5% (longitude) ≥ 300N
ER5%: Strength at 5% elongation of fabric in measurement of sliding resistance according to ASTM D6479-02 The coated fabric for airbags of Claim 1 whose cover factor calculated | required from the following formula of the said textile fabric is 1600-2500.
Cover factor = ((total warp fineness) × 0.9) ^1/2 × (warp weave density) + ((weft total fineness) × 0.9) ^1/2 × (weft weave density) The coat fabric for airbags of Claim 1 or 2 whose adhesion amount of the said resin is 5-40 g / m < ² >. An airbag formed by sewing the coated fabric for an airbag according to any one of claims 1 to 3.   A method for producing a coated fabric for an airbag according to any one of claims 1 to 4, wherein the fabric is coated with the resin while the fabric is conveyed along a support having corners. The manufacturing method of the coated fabric for air bags characterized by the above-mentioned.   The manufacturing method of the coated fabric for airbags of Claim 5 whose said support body is a bedboard or a knife-like thing.   The support is a bedboard, the angle formed by the bedboard and the fabric is in the range of 40 to 80 degrees, and the tension of the fabric during coating is in the range of 500 to 3000 N / m. The manufacturing method of the coated fabric for airbags of Claim 6.   The manufacturing method of the coated fabric for airbags in any one of Claims 5-7 which adjusts warp tension | tensile_strength to 50-230 cN / piece at the time of weaving of the said textile fabric.   The manufacturing method of the coated fabric for airbags in any one of Claims 5-8 which uses a bar temple at the time of weaving of the said textile fabric.

Images