JP2008025090A - Woven fabric for air bag, air bag, and method for producing woven for air bag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a woven fabric for an air bag, which has excellent low air permeability required for the woven fabric for the air bag and compactness during housing in combination and excellent slippage resistance and thereby reducing slippage of a sewn part of the air bag when the air bag is received by the crew after swelling and developing the air bag. <P>SOLUTION: The woven fabric for the air bag is composed of warp yarns and weft yarns composed of synthetic fiber yarns and satisfies the following requirements. (1) 1.1≤Df/Dw≤2.0 in which Dw is the total fineness (dtex) of the warp yarns and Df is the total fineness (dtex) of the weft yarns, (2) CF2/CF1≥1.05 in which CF1 is the cover factor of the warp yarns represented by CF1=(Dw×0.9)<SP>1/2</SP>×Nw and CF2 is the cover factor of the weft yarns represented by CF2=(Df×0.9)<SP>1/2</SP>×Nf, wherein Nw is the weaving density (yarns/2.54 cm) of the warp yarns; and Nf is the weaving density (yarns/2.54 cm) of the weft yarns, (3) EC1≥400 N and EC2≥400 N in which EC1 is the slippage resistance (N) in the warp direction according to ASTM D6479-02 and EC2 is the slippage resistance (N) in the weft direction according to ASTM D6479-02, (4) 0.80≤EC2/EC1≤1.20 and (5) ≤1.0 L/cm<SP>2</SP>min quantity of airflow when measured under 19.6 kPa test differential pressure based on the Frazier type method specified by JIS L 1096. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a fabric for an airbag.

  In recent years, with the improvement of traffic safety awareness, the effectiveness of various airbags has been recognized as a result of the development of various airbags in order to ensure the safety of passengers in the event of a car accident. It is out.

  The airbag is inflated and deployed in the vehicle in a very short time after the vehicle has collided, thereby receiving the occupant moving by the reaction of the collision and absorbing the impact to protect the occupant. In view of this action, it is required that the amount of ventilation of the fabric constituting the bag is small. Moreover, since it is necessary to endure the impact at the time of an airbag operation, the cloth is required to have a certain strength or more. Furthermore, in order to keep the internal pressure of the bag at a certain level or higher when the airbag is inflated and deployed and catches the occupant, it is necessary to reduce the misalignment of the sewing portion of the airbag as much as possible, that is, to improve the anti-miss misalignment. Moreover, compactness at the time of storage is calculated | required from the design property in a vehicle, and the relationship with other components, Furthermore, the request | requirement of cost reduction is also increasing.

  Conventionally, as a means for reducing the air flow rate of a fabric, a coated fabric in which a resin is applied to a fabric for an airbag or a film is attached has been proposed.

  However, if a resin is applied or a film is applied, the thickness of the fabric increases and the compactness at the time of storage deteriorates, which is inappropriate as a fabric for an airbag. Moreover, there is a problem that the manufacturing cost increases due to the increase in the resin coating process and the film attaching process.

In order to solve these problems, non-coated fabrics have recently been proposed that reduce the air flow rate of fabrics by weaving synthetic filament yarns such as polyamide fibers and polyester fibers at high density without applying resin processing. For example, as means for realizing low air permeability, a means is disclosed in which a synthetic filament yarn having a fineness of 300 to 400 dtex is used and a fabric having a symmetrical fabric structure is used (for example, see Patent Document 1). . This means uses a synthetic fiber filament yarn having a fineness of 300 to 400 dtex, has a number of warp yarns and weft yarns of 23 to 28 yarns / cm, and is substantially symmetric in the weave density of the warp yarns and the weft yarns. By forming the structure, an aeration amount of 10 L / dm ² · min or less at a test differential pressure ΔP = 500 Pa and a characteristic in the warp yarn direction and the weft yarn direction are realized in an isotropic mechanical characteristic.

  However, in this means, in order to realize excellent low air permeability and predetermined mechanical performance, it is necessary to make the warp yarn and the weft yarn into a woven fabric having a density of 23 to 28 yarns / cm. It was found that the balance between the fabric warp direction and the transverse direction was poor when measuring the sliding resistance, which is an index indicating the size of the misalignment of the sewing portion of the airbag when the bag catches the occupant after the bag is inflated and deployed.

On the other hand, in order to improve the productivity while providing isotropic strength and flexibility of the base fabric, {weft yarn density (lines / cm) x (weft yarn fineness (denier)) ^1/2 } ÷ {vertical There is also known a means for defining a density coefficient ratio defined by a formula of yarn density (lines / cm) × (warp yarn fineness (denier)) ^1/2 } (see, for example, Patent Document 2).

  According to this means, by adjusting the density coefficient ratio so as not to exceed 0.92, it is possible to reduce the difference in bending resistance between the warp direction and the width direction of the woven fabric, and compactness when storing the airbag. Can be improved.

  However, attention is paid only to the isotropicity of the softness and softness, and no mention is made of the most important airflow reduction as an airbag. Further, when the sliding resistance was measured, there was a problem that the sliding resistance in the weft direction was extremely lower than that in the vertical direction, and the balance of the sliding resistance in the vertical direction and the horizontal direction was extremely poor.

  In addition, the total fineness and weave density of the warp and weft yarns have been achieved in order to achieve excellent characteristics at the same time as having excellent weaving properties, freely controlling the weight and thickness of the fabric, and excellent low air permeability. Different airbag fabrics are disclosed. (For example, refer to Patent Document 3).

  However, in this known example, only the cover factor of the warp yarn and the cover factor of the weft yarn are approximately equal, and the fabric made by this means has a sliding resistance force in the fabric weft direction compared to the warp direction. There was a problem that it was extremely low and the balance of sliding resistance in the vertical and horizontal directions was extremely poor.

As described above, the conventional technology combines the low breathability, high strength, and compactness of the air bag necessary for the airbag fabric, and the misalignment of the sewing portion of the airbag when the airbag receives an occupant after inflating and deploying. An air bag fabric that can reduce the size of the airbag has not been realized.
JP-A-3-137245 (Claim 1) JP 2001-200247 A (Claim 1, paragraph 0013) JP-A-10-219543 (Claims 1 and 2, paragraph 0009)

  The object of the present invention is to solve the above-mentioned problems of the prior art, have both the low air permeability required for airbag fabric and the compactness at the time of storage, and when the airbag receives an occupant after inflating and deploying An object of the present invention is to provide a fabric for an air bag and an air bag that can reduce the misalignment of the sewing portion.

That is, the present invention is a fabric for an airbag made of a warp yarn and a weft yarn made of a synthetic fiber and satisfying the following requirements.
(1) 1.1 ≦ Df / Dw ≦ 2.0
here,
Dw: Total fineness of warp yarn (dtex),
Df: The total fineness (dtex) of the weft.
(2) CF2 / CF1 ≧ 1.05
here,
CF1: Cover factor of warp yarn,
CF1 = (Dw × 0.9) ^1/2 × Nw,
CF2: Weft cover factor,
CF2 = (Df × 0.9) ^1/2 × Nf,
Nw: Woven density of warp yarn (main / 2.54 cm),
Nf: Weft density of the weft yarn (main / 2.54 cm).
(3) EC1 ≧ 400N, EC2 ≧ 400N
here,
EC1: Vertical slip resistance (N) according to ASTM D6479-02,
EC2: Horizontal sliding resistance (N) according to ASTM D6479-02.
(4) 0.80 ≦ EC2 / EC1 ≦ 1.20
(5) The air flow rate is 1.0 L / cm ² · min or less when measured at a test differential pressure of 19.6 kPa based on the Frazier method defined in JIS L 1096.

  Moreover, this invention is an airbag characterized by sewing the fabric for airbags of this invention.

  Further, the present invention is a method for producing an airbag fabric according to the present invention, wherein the weaving is performed by adjusting the warp yarn tension to 75 to 230 cN / unit in weaving. It is.

  Further, the present invention is a method for producing the airbag fabric of the present invention, characterized in that weaving is performed with a difference of 10 to 90% between the tension of the upper thread and the tension of the lower thread at the warp thread opening. It is a manufacturing method of the textile fabric for airbags.

  ADVANTAGE OF THE INVENTION According to this invention, the textile fabric for airbags which has the outstanding low air permeability and storage compactness, and was excellent also in the anti-missing property can be obtained.

  The airbag fabric of the present invention is made of synthetic fibers. Examples of synthetic fiber materials that can be used include polyamide fibers, polyester fibers, aramid fibers, rayon fibers, polysulfone fibers, and ultrahigh molecular weight polyethylene fibers. 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.

  In addition to the circular cross section, it is also preferable to use a flat cross section as the cross-sectional shape of the single fiber of the synthetic fiber. By using a flat cross-section fiber, the filling of the fiber when it is made into a woven fabric is promoted, the gap occupied between the single fibers in the woven fabric is reduced, and if the woven fabric structure is the same, a circular cross-section yarn of the same fineness was used. The amount of ventilation can be suppressed more than the case. 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 there is, more preferably 2.0 to 3.5. Such a flat cross-sectional shape may be a geometrically true elliptical shape, for example, a rectangular shape, a rhombus shape, or a saddle shape, or 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.

  It is preferable that the warp yarn and the weft yarn used in the present invention are synthetic fibers having a relatively low fineness of 1 to 7 dtex as the single fiber fineness. This is because the synthetic fiber filament can be produced without any special device by setting it to 1 dtex or more, and the flexibility of the synthetic fiber is improved by setting it to 7 dtex or less. The single fiber fineness is more preferably 1.5 to 4.0 dtex, still more preferably 2.0 to 3.0 dtex. When the single fiber fineness is within these more limited ranges, the space occupied between the single fibers in the fabric is reduced, and the fiber filling effect is further improved. By setting the single fiber fineness in the above-described low range, an effect of reducing the rigidity of the synthetic fiber can be obtained. In addition, the air flow rate can be reduced, which is preferable. Furthermore, by using weaving conditions under certain conditions, such as weaving with the warp yarn tension increased as described later, the stability of the fabric structure between the warp yarn and the weft yarn is greatly improved. The anti-missing property can be remarkably improved.

  The total fineness of the synthetic fiber yarn is preferably 100 to 700 dtex. By setting it to 100 dtex or more, the strength of the fabric can be maintained. Moreover, the compactness at the time of accommodation and low air permeability can be maintained by setting it as 700 dtex or less. In particular, the warp yarn is more preferably 200 to 400 dtex, still more preferably 300 to 400 dtex. Further, the total fineness of the weft yarn is more preferably 300 to 700 dtex, still more preferably 400 to 500 dtex.

  Furthermore, it is important that the total fineness Dw (dtex) of the warp yarn and the total fineness Df (dtex) of the weft yarn satisfy the relationship 1.1 ≦ Df / Dw ≦ 2.0. Thus, by making the total fineness of the weft yarn larger than the total fineness in the warp direction, it becomes easy to achieve the relationship CF2 / CF1 ≧ 1.05 between the warp yarn and the weft cover factor described later. This is important for improving the sliding resistance in the horizontal direction in a well-balanced manner.

  The tensile strength of the single fiber constituting the airbag fabric of the present invention is 8.0 to 9 for both the warp yarn and the weft yarn in order to satisfy the mechanical properties required for the airbag fabric and from the viewpoint of yarn production. 0.0 cN / dtex is preferable, and 8.3 to 8.7 cN / dtex is more preferable.

  The weave density of the airbag fabric of the present invention may be appropriately set so as to satisfy the relationship of the cover factor described later. Nw / Ww is Nw, and the weft density of the weft is Nf. Nf / Nw ≧ 0.90 is preferable, and Nf / Nw ≧ 1.00 is more preferable.

In the present invention, the cover factor (CF1) of the warp yarn of the woven fabric and the cover factor (CF2) of the weft yarn are defined as follows.
CF1 = (Dw × 0.9) ^1/2 × Nw
CF2 = (Df × 0.9) ^1/2 × Nf
here,
Dw: Total fineness of warp yarn (dtex),
Df: the total fineness (dtex) of the weft
Nw: Woven density of warp yarn (main / 2.54 cm),
Nf: Weft density of the weft yarn (main / 2.54 cm).

  The cover factor of the warp and weft yarns of the woven fabric is preferably 950 to 1250. By adjusting the cover factor within this range, it is possible to achieve both the required compact fabric storage capacity, low air permeability and slip resistance. By setting each cover factor to 950 or more, it is possible to reduce the air flow rate and improve the sliding resistance. Moreover, compact storage property can be improved by making each cover factor 1250 or less.

  In the airbag fabric of the present invention, it is important that the cover factor CF1 of the warp yarn and the cover factor CF2 of the weft yarn satisfy the relationship of CF2 / CF1 ≧ 1.05. Setting CF2 / CF1 to 1.05 times or more provides a better balance of sliding resistance in the warp direction and the weft direction of the fabric than in the case of a symmetric fabric with the same warp cover factor and weft cover factor. It is indispensable to improve together. Preferably, CF2 / CF1 ≧ 1.10 times or more.

  In order to improve the balance between the sliding resistance in the warp direction and the weft direction, the present inventors have intensively studied the relationship between the warp and weft cover factors of the fabric and the slip resistance in each direction. Then, the cover factor of the warp yarn of the woven fabric was fixed, the cover factor of the weft yarn was changed, and the sliding resistance was measured. As shown in Table 1, the cover factor of the weft yarn was changed to the cover factor of the warp yarn. On the other hand, surprisingly, not only does the sliding resistance of the fabric in the horizontal direction improve, but the sliding resistance in the vertical direction also improves, and the sliding resistance in the vertical and horizontal directions can be improved in a balanced manner. I found. Here, the slip resistance force is based on ASTM D6479-02, and the slip resistance force in the vertical direction is the maximum when a pin is stabbed along the weft thread and the weft thread is moved in the warp direction with the pin. The sliding resistance force in the horizontal direction is obtained by measuring the maximum load when a pin is stabbed along the warp yarn and the warp yarn is moved in the horizontal direction with the pin.

  It is considered that the contact state at the intersection of the warp and the weft is influencing the improvement of the sliding resistance. That is, the larger the contact area at the crossing point, the greater the frictional resistance between the warp and the weft and the less likely the movement of the yarn during the sliding resistance measurement. In order to increase the contact area between the warp yarn and the weft yarn at the intersection, it can be realized by increasing the total fineness of the synthetic fiber yarn or increasing the weave density. In the former case, the contact area is increased by increasing the surface area when the cross section of the synthetic fiber yarn is regarded as substantially elliptical. In the latter case, the contact area is increased by increasing the number of contact between the warp yarn and the weft yarn.

  By the way, when weaving fabrics for airbags, weft yarn is driven between the warp yarns that move up and down by opening movement with higher tension than warp yarn, so that weft yarns are relatively tight in fabrics. On the other hand, warp yarns tend to have a structure that winds so as to reciprocate between the front and back of the fabric. This is a so-called vertical bending structure.

  Considering this warp bending structure, if the cover factor CF1 of the warp yarn of the woven fabric is made larger than the cover factor CF2 of the weft yarn, the tension of the weft yarn cannot contribute much to the formation of the warp bending structure. In both warp and weft yarns, the bent structure does not change greatly, and the effect of increasing the contact area cannot be obtained. On the other hand, when the cover factor CF2 of the weft of the woven fabric is made larger than the cover factor CF1 of the warp yarn, the warp bend structure can be promoted both when the total fineness of the weft yarn is increased and when the weave density is increased. . Thus, since the contact area between the warp yarn and the weft yarn can be more efficiently improved by promoting the warp bending structure, it is considered that the slip resistance in the warp direction and the slip resistance in the warp direction are improved at the same time.

  In the airbag fabric of the present invention, it is important that the sliding resistance in the vertical direction and the sliding resistance in the horizontal direction are both 400 N or more, preferably 450 N or more, and more preferably both 500 N or more. By setting both to 400 N or more, it is possible to suppress the misalignment of the sewing portion when the airbag is inflated and deployed to restrain the occupant as much as possible, and to maintain the internal pressure of the airbag.

In the airbag fabric according to the present invention, it is important that the ratio between the slip-off resistance (EC1) in the vertical direction and the slip-resistance (EC2) in the horizontal direction is in the following relationship. 0.85 ≦ EC2 / EC1 ≦ 1.15
By doing so, the misalignment of the sewing portion when the airbag is inflated and deployed to restrain the occupant can be suppressed as much as possible, and the internal pressure of the airbag can be maintained. In general, since airbags are deployed isotropically up and down, left and right, if EC1 and EC2 do not satisfy the above relationship, misalignment of the sewing portion occurs in a direction with low sliding resistance, and the internal pressure of the airbag is reduced. I can't hold it.

The air bag fabric of the present invention must have an air flow rate of 1.0 L / cm ² · min or less when measured at a test differential pressure of 19.6 kPa based on the Frazier method defined in JIS L 1096. Preferably, it is 0.7 L / cm ² · min or less. 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. If the air flow rate exceeds 1.0 L / cm ² · min, the inflated state of the airbag cannot be maintained due to the collision of the occupant, and the occupant restraint property is inferior.

  The airbag fabric of the present invention preferably has a tensile strength based on the strip method specified in JIS K 6404-3 of 400 N / cm or more, more preferably 500 N / cm or more, and still more preferably 550 N / cm. That's it. By setting it to 400 N / cm or more, when the airbag is inflated and deployed to restrain the occupant, the airbag can be prevented from being damaged due to the breakage of the fabric.

  Next, a method for producing the airbag fabric of the present invention will be described.

  The airbag fabric of the present invention is woven by using synthetic fiber yarns for warp yarns and weft yarns, and setting the cover factor of the weft yarns of the fabric to be larger than the cover factor of the warp yarns of the fabric.

  First, warp the warp yarn of the above-mentioned material and the total fineness and apply it to the loom, and prepare the weft yarn in the same manner. As such a loom, for example, 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.

  As a method for producing a fabric for an airbag of the present invention, it is preferable to adjust the warp yarn tension to 75 to 230 cN / unit in weaving, and more preferably, the warp yarn tension is within this range of 100 to 200 cN / unit. By adjusting, the space | gap between the single fibers in the yarn bundle of the multifilament yarn which comprises a textile fabric can be reduced, Therefore Air flow rate can be reduced. In addition, the warp yarn subjected to the above-mentioned tension pushes and bends the weft yarn after driving the weft yarn, thereby increasing the tissue restraint force of the fabric in the weft direction and improving the anti-alignment property of the fabric. Air leakage due to misalignment of the sewing portion when forming the body can be suppressed. When the warp yarn tension is less than 75 cN / line, the contact area of the warp yarn and the weft yarn in the woven fabric cannot be increased, and the sliding resistance is not improved. Further, since the effect of reducing the gap between the single fibers is small, it is not preferable in terms of low air permeability. On the other hand, if it exceeds 230 cN / string, the warp yarns will become fuzzy and the weaving property will deteriorate.

  Specific methods for adjusting the warp yarn tension within the above range include a method of adjusting the weft yarn feeding speed in addition to adjusting the warp yarn feed speed of the loom. Whether the warp yarn tension is actually within the above range during weaving can be determined, for example, by measuring the tension applied to one warp yarn with a tension measuring instrument between the warp beam and the back roller while the loom is running. Can be confirmed.

  Further, it is preferable to make a difference of 10 to 90% between the tension of the upper thread and the tension of the lower thread in the warp thread opening. By doing so, the above-described warp yarn bending structure is promoted, and the warp yarn and the weft yarn are strongly pressed against each other, and the friction resistance force between the yarn and the yarn is increased, and the slipping resistance force can be improved.

  As a method of making a difference between the tension of the upper thread and the tension of the lower thread at the warp thread opening, for example, by setting the back roller at a higher position, the upper thread traveling line length and the lower thread traveling line length There is a way to make a difference. For example, by arranging a guide roll between the back roller and the reed and shifting the opening fulcrum from the warp line up or down by this guide roll, the running line length of one thread is longer than the other when opening, The tension increases, and it becomes possible to make a difference between the tension of the upper thread and the tension of the lower thread. As the installation position of the guide roll, it is preferable to arrange the guide roll at a position of 20 to 50% from the back roller side with respect to the interval between the back roller and the wrinkle drawing. The position of the opening fulcrum is preferably 5 cm or more away from the warp line.

  In addition, as another method for making a difference between the tension of the upper thread and the tension of the lower thread, for example, a cam drive system is adopted for the opening device, and the dwell angle on one side of the upper thread / lower thread is 100 degrees or more than the other. There is also a way to take large. The tension increases when the dwell angle is increased.

  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 front of the weave, so that the gap between the synthetic fiber filaments can be reduced, and as a result, the low air flow rate and the resistance to misalignment are improved. .

  Next, when the weaving process is finished, processing such as scouring and heat setting is performed as necessary. In particular, when a small air flow rate is required, a coated fabric may be formed by applying a resin or the like on the surface of the base fabric or attaching a film as necessary.

  The airbag of the present invention is obtained by sewing the airbag fabric into a bag shape and attaching an accessory device 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.

  The air bag fabric and the air bag of the present invention are characterized by the excellent low air permeability required for the air bag fabric and the compactness at the time of storage, and excellent sliding resistance. The method for producing a fabric for an airbag of the invention can easily produce such an airbag fabric.

[Measuring method]
(1) Fabric thickness According to JIS L 1096: 1999 8.5, using a thickness measuring machine at 5 different points of the sample, after waiting for 10 seconds under 23.5 kPa under pressure to stabilize the thickness The thickness was measured and the average value was calculated.

(2) Weave density of warp and weft yarns Measured based on JIS L 1096: 1999 8.6.1.
The sample was placed on a flat table, and the number of warp yarns 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 weighting 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 was the mass per 1 m ² (g / M ² ).

(4) Tensile strength JIS K 6404-3 In accordance with test method B (strip method), for each of the vertical and horizontal directions, 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, and the maximum load until cutting was measured, and the average value was calculated for each of the vertical and horizontal directions.

(5) Elongation at break JIS K 6404-3 In accordance with test method B (strip method), for each of the vertical direction and the horizontal 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 vertical and horizontal directions.
E = [(L-100) / 100] × 100
Where E: elongation at break (%),
L: Distance (mm) between marked lines at the time of cutting.

(6) Tear strength JIS K 6404-4 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 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, an average value was calculated for each of the vertical and horizontal directions.

(7) Aeration rate According to JIS L 1096: 1999 8.27.1 A method (Fragile type method), the aeration rate when tested at a test differential pressure of 19.6 kPa was measured. 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.

(8) Packability Measured according to ASTM D6478-02.

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

(10) Warp yarn tension Using Checkmaster (registered trademark) (model: CM-200FR) manufactured by Kanai Koki Co., Ltd., the warp beam and the back roller are added per warp yarn at the center of the warp beam and back roller during operation. Tension was measured.

(11) Upper yarn tension / lower yarn tension at the warp yarn opening Stop the loom with the warp yarn open, and place a guide roll between the back roller and the squeezer (between the back roller and the heel). If the tension is applied between the upper and lower warp yarns (between the guide roll and the heel), the tension of the upper yarn is measured with the same tension measuring machine as used in (10) above. It was measured. Similarly, the tension applied to one warp yarn on the lower side was measured as the tension of the lower yarn.

(12) Comprehensive Evaluation Criteria Both the air flow rate obtained by the above measurement method and the sliding resistance value are 1.0 L / cm ² · min or less and 400 N or more as target values, respectively. The case where the value was satisfied was evaluated as “◯”, the case where one of the values was satisfied was evaluated as “Δ”, and the case where both values were not satisfied was evaluated as “×”.

[Example 1]
(Vertical yarn)
Made of nylon 6,6, with a circular cross-sectional shape, a single fiber fineness of 2.6 dtex, a filament count of 136, a total fineness of 350 dtex, no twist, a strength of 8.5 cN / dtex, and an elongation of 23.5% A fiber multifilament was used.

(Horizontal thread)
Made of nylon 6,6, with a circular cross-sectional shape, a single fiber fineness of 3.5 dtex, a filament count of 136, a total fineness of 470 dtex, no twist, a strength of 8.5 cN / dtex, and an elongation of 23.0% A fiber multifilament was used.

(Weaving process)
Using the warp yarn and the weft yarn, a woven fabric having a warp yarn weaving density of 56 yarns / 2.54 cm and a weft yarn weaving density of 58.5 yarns / 2.54 cm was woven.

  A water jet loom is used as a loom, a bar temple is installed between the hammering portion and the friction roller to grip the fabric, and the warp is positioned at a position 40 cm from the back roller between the back roller and the scissors. A guide roll was attached so as to lift the 7 cm warp yarn from the line.

  The weaving conditions were adjusted so that the warp yarn tension during weaving was 147 cN / main, the upper yarn tension when the loom was stopped was 118 cN / main, the lower yarn tension was 167 cN / main, and the loom speed was 500 rpm. did.

(Heat setting process)
Subsequently, this fabric was 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%.

  The obtained airbag fabric had both low air permeability and compactness during storage, and the sliding resistance in the vertical and horizontal directions was well balanced, satisfying the target value.

[Comparative Example 1]
(Vertical yarn)
A warp yarn similar to that used in Example 1 was used.

(Horizontal thread)
A thread similar to that used in Example 1 was used.

(Weaving process)
Using the warp yarn and the weft yarn, a woven fabric having a warp yarn weaving density of 63 yarns / 2.54 cm and a weft yarn weaving density of 55 yarns / 2.54 cm was woven.

  The loom configuration and weaving conditions were the same as in Example 1.

(Heat setting process)
Subsequently, the heat setting process similar to Example 1 was performed to this fabric.

  The obtained airbag fabric had no problem with air permeability, but had a low horizontal sliding resistance and a poor horizontal balance in terms of the sliding resistance.

[Comparative Example 2]
(Vertical yarn)
A warp yarn similar to that used in Example 1 was used.

(Horizontal thread)
A thread similar to that used in Example 1 was used.

(Weaving process)
Using the warp yarn and the weft yarn, a woven fabric having a warp yarn weaving density of 63.5 / 2.54 cm and a weft yarn weaving density of 46 / 2.54 cm was woven.

  The loom configuration and weaving conditions were the same as in Example 1.

(Heat setting process)
Subsequently, the heat setting process similar to Example 1 was performed to this fabric.

  The obtained airbag fabric had no problem with the amount of air flow, but had a low horizontal sliding resistance and a poor horizontal balance in terms of the sliding resistance.

[Example 2]
(Vertical yarn)
A warp yarn similar to that used in Example 1 was used.

(Horizontal thread)
A thread similar to that used in Example 1 was used.

(Weaving process)
Using the warp yarn and the weft yarn, a woven fabric having a warp yarn weaving density of 59 yarns / 2.54 cm and a weft yarn weaving density of 59 yarns / 2.54 cm was woven.

  A water jet loom is used as a loom, a bar temple is installed between the hammering portion and the friction roller to grip the fabric, and the warp line is positioned 40 cm from the back roller to the back roller. A guide roll was attached so as to lift the 8 cm warp yarn.

  Weaving conditions were adjusted so that the warp yarn tension during weaving was 127 cN / main, the upper yarn tension when the loom was stopped was 108 cN / main, the lower yarn tension was 147 cN / main, and the loom rotation speed was 500 rpm. did.

(Scouring and heat setting process)
The fabric was then passed through a 60 ° C. hot water shrink bath containing 0.5 g / l of alkylbenzene sulfonic acid soda and 0.5 g / l of soda ash for 20 seconds and dried at 160 ° C. for 10 seconds using a non-touch dryer. Then, using a pin tenter dryer, heat setting was performed at 180 ° C. for 1 minute under the dimensional regulation with a width insertion rate of 0% and an overfeed rate of 0%.

  The obtained airbag fabric had both low air permeability and compactness during storage, and the sliding resistance in the vertical and horizontal directions was well balanced, satisfying the target value.

[Comparative Example 3]
(Vertical / Horizontal)
Made of nylon 6,6, with a circular cross-sectional shape, single fiber fineness of 4.9 dtex, 72 filaments, total fineness of 350 dtex, no twist, strength 8.5 cN / dtex, elongation 23.5% Fiber multifilaments were used for warp and weft yarns.

(Weaving process)
Using the warp yarn and the weft yarn, a woven fabric having a warp yarn weaving density of 60 / 2.54 cm and a weft yarn weaving density of 60 / 2.54 cm was woven.

  A water jet loom was used as the loom, and a ring temple was installed between the beating portion and the friction roller to grip the fabric. The guide roll as used in Example 1 was not attached.

As the weaving conditions, the warp yarn tension during weaving was adjusted to 69 cN / line, the upper thread tension when the loom was stopped was adjusted to 69 cN / line, and the lower thread tension was adjusted to 69 cN / line, and the loom rotation speed was 500 rpm. (Scouring and heat setting process)
The fabric was then passed through a 60 ° C. hot water shrink bath containing 0.5 g / l of alkylbenzene sulfonic acid soda and 0.5 g / l of soda ash for 20 seconds and dried at 160 ° C. for 10 seconds using a non-touch dryer. Then, using a pin tenter dryer, heat setting was performed at 180 ° C. for 1 minute under the dimensional regulation with a width insertion rate of 0% and an overfeed rate of 0%.

  The obtained air bag fabric had a large air flow rate and a low sliding resistance in the horizontal direction, so that the horizontal and horizontal balance was poor in terms of the sliding resistance.

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

Claims (9)

A fabric for airbag, which is composed of warp yarn and weft yarn made of synthetic fiber and satisfies the following requirements.
(1) 1.1 ≦ Df / Dw ≦ 2.0
here,
Dw: Total fineness of warp yarn (dtex),
Df: The total fineness (dtex) of the weft.
(2) CF2 / CF1 ≧ 1.05
here,
CF1: Cover factor of warp yarn,
CF1 = (Dw × 0.9) ^1/2 × Nw,
CF2: Weft cover factor,
CF2 = (Df × 0.9) ^1/2 × Nf,
Nw: Woven density of warp yarn (main / 2.54 cm),
Nf: Weft density of the weft yarn (main / 2.54 cm).
(3) EC1 ≧ 400N, EC2 ≧ 400N
here,
EC1: Vertical slip resistance (N) according to ASTM D6479-02,
EC2: Horizontal sliding resistance (N) according to ASTM D6479-02.
(4) 0.80 ≦ EC2 / EC1 ≦ 1.20
(5) The air flow rate is 1.0 L / cm ² · min or less when measured at a test differential pressure of 19.6 kPa based on the Frazier method defined in JIS L 1096. The airbag fabric according to claim 1, wherein the fineness of the single fibers constituting the warp yarn and the weft yarn is 1 to 7 dtex. The airbag fabric according to claim 1 or 2, wherein the total fineness of the warp yarn and the weft yarn is 100 to 700 dtex, respectively. The airbag fabric according to any one of claims 1 to 3, wherein the cover factor CF1 of the warp yarn and the cover factor CF2 of the weft yarn are both 950 to 1250. Furthermore, the fabric for airbags in any one of Claims 1-4 which satisfy | fills CF2 / CF1> = 1.10. An airbag comprising the airbag fabric according to any one of claims 1 to 5 sewed. A method for producing an airbag fabric according to any one of claims 1 to 5, wherein the weaving is carried out by adjusting the warp yarn tension to 75 to 230 cN / piece in weaving. Method. It is a method of manufacturing the textile fabric for airbags in any one of Claims 1-5, Comprising: Weaving with a difference of 10 to 90% between the tension | tensile_strength of the upper thread | yarn in the warp thread opening, and the tension | tensile_strength of lower thread | yarn A method for producing a fabric for an air bag, which is characterized. The method for producing a fabric for an airbag according to claim 7 or 8, wherein a bar temple is used as the temple at the time of weaving.