JP2014181430A - High-density fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high-density fabric having uniform quality in a width direction, and to provide a method for manufacturing the same.SOLUTION: The high-density fabric includes a warp and a weft comprising a synthetic fiber multifilament yarn having a fineness of 210-750 dtex, is a fabric of a plain texture having a cover factor in a range of 2,000-2,500, and has a flare ratio of 0-1.5 in a warp direction of an end of the fabric.

Description

  The present invention relates to a high-density fabric, and more particularly to a high-quality high-density fabric suitable for an airbag and a weaving method for stably producing the high-density fabric.

  In order to reduce the impact on the human body in a vehicle accident, the installation of airbags on vehicles such as automobiles has been progressing. In addition to driver and passenger airbags, side airbags, side airbags, and knees are used as airbags that inflate and absorb shock to the human body in the event of a collision. Air bags, inter-seat air bags, rear window curtain bags, rear seat belt airbags, and the like are being put into practical use. Furthermore, in order to protect pedestrians, various types of airbags such as airbags that are installed so as to be inflated outside the vehicle have been studied.

Because the airbag fabric is a safety part, the quality of the fabric that makes up the airbag is highly uniform so that the airbag can fully perform its functions in the event of an accident. It is required that there is no.
In recent years, the demand for air bag mounting has been increasing due to the arrival of the automobile society in emerging countries, and it is important that the safety is ensured and the quality is stable at low cost.

  2. Description of the Related Art Conventionally, airbags have been produced by a production method in which a plain woven fabric is sewn into a bag shape to create an airbag, or a production method in which a bag is formed into a bag weaving structure at the loom stage. Here, when weaving plain fabrics and bag fabrics, the fabrics should be free from defects, the density should not change in the width and longitudinal directions, and functionally the fabric should have uniform strength and air permeability everywhere. Is important in maintaining the quality of the airbag, which is a safety component. In addition, being able to produce stably with few defects leads to a low-cost and high-quality airbag fabric.

  In particular, when weaving a high-density plain woven fabric such as an airbag fabric, looseness occurs particularly in the warp at the ears at both ends of the fabric. There has been a problem that the weaving property of the loom deteriorates due to the difference in air permeability and looseness of the ears, and there has been a demand for improvement in quality and production. In addition, as the loom increases in speed and width, the impact of the loosening of the ears at both ends increases on the weaving property. Various problems such as non-uniformity are increasing.

  So far, weaving methods have been proposed to stably produce high-quality airbag fabrics. The warp yarns have been devised, for example, by changing the warp fineness and yarn type of the fabric ears. Although a method for making the quality in the width direction uniform has been proposed, it cannot be said to be sufficient for removing looseness of the warp at the ear (see Patent Documents 1 and 2 below). Moreover, although the method of changing the woven structure of a textile ear part is also proposed, a structure change is not simple and an effect is small (refer the following patent document 3). Furthermore, although a method of removing looseness of the ear part of the fabric has been proposed depending on the processing method (see Patent Document 4 below), a fundamental solution to the conventional methods such as generation of wrinkles in the ear part. There is nothing that has led to.

JP-A-10-236253 Japanese Patent Laid-Open No. 9-302550 JP 2002-212856 A JP 10-76895 A

  The present invention relates to a high-density fabric for airbags, and an object thereof is to provide a high-density fabric having uniform quality in the width direction and a method for producing the same.

As a result of intensive studies to solve the above-mentioned problems, the present inventor uses a specific number of fibers whose fineness is within a specific range with respect to the warp fineness of the ground portion as the force yarn of the ear portion of the high-density fabric. The inventors have found that a high-quality fabric for an airbag can be obtained by setting the warp tension during weaving within a certain range, and have reached the present invention based on this finding.
That is, the present invention provides the following inventions.

(1) A warp and a weft are composed of a synthetic fiber multifilament yarn having a fineness of 210 to 750 dtex, and have a plain structure with a cover factor in the range of 2000 to 2500, and the flare rate in the warp direction of the end of the fabric is 0 to A high-density fabric characterized by being 1.5.
(2) The high-density fabric according to (1) above, wherein a difference in warp density between the central portion and the end portion of the fabric is 2.0 / 2.54 cm or less.
(3) As for the ears of the fabric, 2 to 24 yarns having a fineness in the range of 3 to 30% of the warp fineness of the ground portion are used as the force yarns and 4 as the ground fault yarns in both the left and right ear portions. The high-density fabric according to (1) or (2) above, which is used.
(4) The high-density fabric according to any one of (1) to (3) above, wherein the width of the fabric is 2.0 m or more.
(5) The high-density fabric according to any one of (1) to (4) above, wherein the warp and weft yarns constituting the fabric are in the range of 1.5 to 4.0. .
(6) The high-density fabric according to any one of (1) to (5) above, wherein the warp and the weft are at least one kind of fiber selected from polyamide-based continuous fibers and polyester-based continuous fibers. .
(7) Polyamide continuous fiber and polyester continuous fiber are polyamide 6 continuous fiber, polyamide 66 continuous fiber, polyamide 46 continuous fiber, polyethylene terephthalate continuous fiber, polybutylene terephthalate continuous fiber, polytrimethylene terephthalate continuous fiber, polyethylene naphthalate continuous fiber The high-density fabric according to (6) above, which is at least one type of fiber selected from fibers.
(8) The method for producing a high-density fabric according to any one of (1) to (7) above, wherein the warp tension in the weaving step is 0.20 cN / dtex to 0.45 cN / dtex.
(9) The method for producing a high-density fabric according to the above (8), wherein the number of warp yarns in the weaving step is 1 / feather.
(10) The method for producing a high-density fabric according to (8) or (9) above, wherein the weaving step includes at least the following conditions (a) and (b).
(A) Use a water jet loom with one or two wefts.
(B) Weaving at a loom speed of 500 rpm or more.
(11) An airbag using at least a part of the high-density fabric according to any one of (1) to (7) above.

  The high-density woven fabric of the present invention and the high-density woven fabric produced by the weaving method of the present invention are woven fabrics having performances such as uniform weaving density and air permeability in the fabric width direction as compared with the woven fabric obtained by the conventional manufacturing method. Further, the occurrence of warp looseness at the ears is small and the weaving property is good, so that it can sufficiently cope with the increase in the speed and width of the loom. Therefore, the high-density fabric of the present invention can have a fabric width of 2 m or more.

Hereinafter, the present invention will be specifically described.
In the present invention, the flare rate is a characteristic for evaluating the looseness of a woven or woven fabric, and is measured by the following procedure. Draw two lines in the direction perpendicular to the warp with 500 mm spacing in the warp direction, and then several lines from the fabric end to the center along the warp direction. Is drawn in a direction perpendicular to the warp at a distance of 15 mm, and a strip-shaped woven fabric of 15 mm width × 500 mm length is cut out along the line. When the length when the strip is placed straight is L, the flare rate (F) is expressed by the following equation.
F (%) = (| L−500 | / 500) × 100
The measurement is continuously performed at 10 positions from the left and right ends, this operation is repeated 5 times in the warp direction, and the obtained values at 100 positions are averaged.

  The flare rate of the high-density fabric of the present invention is 1.5% or less. More preferably, it is 1.0% or less, More preferably, it is 0.5% or less. Since the flare rate does not exceed 1.5%, there is little variation in air permeability when commercialized as an airbag, so the shock absorption of the human body and head when the airbag is deployed is as designed. Is achieved and the potential for safety hazards is reduced. The smaller the flare rate, the better.

  In order to reduce the flare rate, for example, as a force yarn of the ear part of a high-density fabric, a specific number of fibers whose fineness is in a specific range with respect to the warp fineness of the ground part is used, and the warp tension during weaving is reduced. It is effective to reduce the looseness of the ears by setting a certain range.

  In the high-density fabric of the present invention, the difference between the warp density at the end of the fabric and the warp density at the center is preferably 2.0 / 2.54 cm or less, more preferably 1.5 / 2.54 cm. In the following, it is particularly preferably 1.0 / 2.54 cm or less. If the difference in warp density between the edge and the center of the fabric exceeds 2.0 / 2.54 cm, the air permeability differs in the width direction of the fabric, and air with different shock absorption in the width direction as above. May be a bag. The fabric end here refers to a position 20 cm inside from the ear.

The high-density fabric of the present invention preferably has a weight per unit area of 140 to 260 g / m ² in the absence of a coating agent such as silicone. If the weight per unit area is 140 g / m ² or more, it satisfies the mechanical properties that can withstand high-pressure deployment when used as an airbag. In the present invention, a lightweight woven fabric having a weight per unit area of 260 g / m ² or less is preferable for an airbag. A more preferable weight per unit area is 150 to 210 g / m ² .

  The cover factor of the high-density fabric of the present invention is preferably a value of 2000 to 2500. The lower limit is more preferably 2100 or more, particularly preferably 2200 or more. The upper limit is more preferably 2400 or less, and particularly preferably 2300 or less. When the cover factor is 2000 or more, low ventilation is achieved, and when the cover factor is 2500 or less, the fabric does not become rigid but has flexibility. The cover factor is expressed as √ (fineness of warp (dtex) × warp density (line / 2.54 cm)) + √ (fineness of weft (dtex) × weft density (line / 2.54 cm)). Density Calculates the cover factor by measuring the warp density and weft density at the center of the fabric.

  It is preferable that the tensile strength of the high-density fabric of the present invention is 500 to 900 N / cm in both history. If the tensile strength of the woven fabric is 500 N / cm or more, it contributes to burst resistance that can withstand high-pressure gas development. The upper limit of the tensile strength of the woven fabric is 900 N / cm in the case of a low-definition woven fabric because of the strength of the woven yarn and the woven density. More preferably, the tensile strength of the fabric is 600 to 900 N / cm.

  The high-density fabric of the present invention should have less variation in the air permeability in the width direction, and since the air permeability has a smaller variation in the width direction, when it becomes an airbag product, The shock absorption can be changed to suppress the possibility of a safety risk. The smaller the variation in the width direction of the air permeability, the better.

  The high-density fabric of the present invention is made of synthetic fibers. As the synthetic fiber, a multifilament yarn is preferable, and a continuous fiber of polyamide or polyester is preferable. Particularly preferably, the fibers are polyamide fibers, polyamide 6, polyamide 6,6, polyamide 11, polyamide 12, polyamide 6,10, polyamide 6,12, polyamide 4,6, a copolymer thereof and a mixture thereof. Can be mentioned. Among these, it is preferable that the polyamide 6/6 fiber is mainly composed of polyhexamethylene adipamide fiber. The polyhexamethylene adipamide fiber refers to a polyamide fiber having a melting point of 250 ° C. or higher composed of 100% hexamethylenediamine and adipic acid. Polyamide fiber used in the present invention is a copolymer or blend of polyhexamethylene adipamide with polyamide 6, polyamide 6 · I, polyamide 6 · 10, polyamide 6 · T, etc. within a range where the melting point is not less than 250 ° C. It may be a fiber made of a polymer.

  The polyamide fabric in the present invention preferably has an oil component content of 0.01 to 2.0% by weight. 0.05-1.5 weight% is more preferable. More preferably, it is 0.1 to 0.7% by weight. An oil agent component here is what is extracted from a textile fabric with the organic solvent hexane, and is the percentage of the weight of the extract with respect to the weight of a polyamide textile fabric. If the content of the oil component is 0.01% by weight or more, the tear strength of the fabric can be maintained and improved. In particular, the surfactant component helps bleed out the cyclic unimer of the polyamide fiber, and on the surface of the polyamide fiber, the cyclic unimer and the oil component are integrated to appropriately promote the sliding between the fibers, and the tensile strength and tear strength are increased. Contributes to maintenance and improvement. That is, since an improvement in gas pressure resistance when deployed as an airbag fabric can be expected, it contributes to prevention of bursts during deployment. On the other hand, the content of the oil agent component in the woven fabric can be controlled to 2.0% by weight or less, and the content can be controlled from the applied amount and the scouring removed amount, and the drawing resistance of the woven yarn in the woven fabric can be appropriately maintained. Moreover, it can control so that it may not become an oil agent component of excess content so that a textile fabric may pass in a flammability test (FMVSS302). These oil agent components may be derived from the process oil agent applied in the fiber manufacturing process and the weaving process.

  In addition to the above, as long as the effect of the present invention is not impaired, such fibers include various additives that are usually used for improving the productivity or characteristics in the production process and processing process of the raw yarn. You can leave. For example, a raw yarn containing a heat stabilizer, an antioxidant, a light stabilizer, a smoothing agent, an antistatic agent, a plasticizer, a thickener, a pigment, a flame retardant, and the like can be used as the weaving yarn.

  The cross-sectional modulus of the warp and weft constituting the high-density fabric of the present invention is preferably 1.5 to 4.0. When it is smaller than 1.5, a gap is easily formed between the yarns constituting the fabric, and the fabric becomes poor in air permeability. On the other hand, if it is larger than 4.0, the yarn becomes too flat, which may be caused by too high warp tension during weaving or excessive calendering. As a result, fluff is generated on the yarn. Cheap. In addition, the fabric itself becomes too thin, resulting in poor breathability and reduced tear resistance. In addition, the definition and measurement method of the yarn section modulus in the present invention will be described later.

  The fineness of the warp and weft of the high-density fabric of the present invention is preferably 210 to 750 dtex. The total fineness of the raw yarn used is preferably 200 to 720 dtex. When the total fineness of the raw yarn is 200 dtex or more, the mechanical properties that can withstand high-pressure deployment are satisfied. Further, if the raw yarn fineness is 720 dtex or less, it becomes a lightweight and storable woven fabric and contributes to initial restraint. A more preferable raw yarn total fineness is 200 to 490 dtex, and in a loom of a type in which wefts fly by the force of water or compressed air, such as a water jet loom or an air jet loom, it is particularly suitable for high speed. In the process of weaving, since the heat shrinks normally, the total fineness of the woven yarn constituting the woven fabric is slightly larger than the total fineness of the original yarn.

  The yarn used for weaving the woven fabric preferably has a tensile strength of 9.8 to 11.5 cN / dtex. The higher the original yarn tensile strength is 9.8 cN / dtex or more, the higher the tensile strength of the fabric. The upper limit of the yarn tensile strength for obtaining a yarn of stable quality suitable for weaving is 11.5 cN / dtex.

  From the relationship of thermal shrinkage in the process of weaving, the boiling water shrinkage of the raw yarn is preferably 5 to 12%. If the boiling water shrinkage ratio of the raw yarn is 5% or more, the tension treatment is performed at the time of the heat shrinking process, thereby suppressing the woven yarn crimp and contributing to the suppression of the specific load elongation of the fabric. If the boiling water shrinkage is too low, the yarn crimp at the time of weaving is reflected in the fabric as it is, so that the specific load elongation of the fabric cannot be suppressed. The upper limit of the substantial boiling water shrinkage of the raw yarn is 12%.

  The force yarn used in the present invention is a yarn that is used for the ears at both ends of the fabric so as to reduce the looseness of the fabric ears. The fineness of the force yarn used is preferably 3 to 30% with respect to the warp fineness of the ground portion. More preferably, it is 4 to 15%, and particularly preferably 4.5 to 10%. The material is not particularly particular such as nylon 66 fiber, nylon 6 fiber or polyester fiber, but it is preferable to use the same material as warp and weft in consideration of recycling.

  The fineness of the force yarn is preferably 16 to 110 dtex, more preferably 22 to 67 dtex, and particularly preferably 22 to 33 dtex. The number of force yarns is preferably 2 to 24, and the same number is preferably used for the left and right ears. However, if the looseness of one ear does not subside, a non-uniform number may be used. More preferably, it is 2-8, more preferably 4-6, on one side. The force yarn may be a monofilament yarn or a multifilament yarn, but in the case of 33 dtex or less, the monofilament yarn is suitable in terms of strength. Furthermore, it may be a raw yarn, a yarn subjected to false twisting or crimping, a spun yarn, or a combination thereof.

  The grounding yarn used in the present invention is one which is tightened so that the fabric ears are not loosened at the left and right end portions of the fabric, and generally uses two yarns on one side, It is organized into a woven fabric while gripping the weft yarns one by one, such as a Leno type in which the yarns are alternately switched left and right. In the Reno type, it is also effective to tighten the ear portion by using not only one set on one side but also several sets of Reno.

  When weaving the high-density fabric of the present invention, the warp tension during weaving is preferably 0.20 to 0.45 cN / dtex. More preferably, it is 0.24-0.40 cN / dtex, More preferably, it is 0.29-0.36 cN / dtex. When the warp tension is lower than 0.20 cN / dtex, when weaving a high-density fabric, the warp at the ear tends to be loosened, but the looseness cannot be fully extended, and the loom during weaving such as the warp hook of the weft Suspension is likely to occur. On the other hand, when the warp tension exceeds 0.45 cN / dtex, the force applied to the warp is too large and fluff is likely to occur, and the weaving property and the fabric quality are deteriorated.

  When weaving the high-density fabric of the present invention, the number of warps to be laid (number of warps per wing) may be 2 / wing, but preferably 1 / wing. In addition, warps and force yarns may be put in the number of 2 / feather or more in the ear portion, and it is also effective to reduce looseness of the fabric ear portion by combining the number of the cocoons. Therefore, the “number of warp yarns” mentioned here does not include those for only the fabric ears.

  When weaving the high-density fabric of the present invention, an oil component or a wax component may be added to the warp or the like for improving the convergence or smoothness at the stage of warp preparation or on the loom. The oil agent and wax component applied here may be finally contained in the airbag fabric. Further, sizing may be applied to prevent generation of fluff and warp breakage during weaving. However, it is most preferable to wind up the loom beam with non-sizing, non-oil, non-wax without adding any agent to the raw yarn.

  In the weaving of the high-density fabric of the present invention, the loom to be used is preferably a water jet loom, an air jet loom, a rapier loom or a multiphase loom, and these can be used to create a fabric. In particular, the water jet loom is preferable from the viewpoint of speeding up, widening, and machine price. In the water jet loom, if it is a one-color type in which wefts are inserted by one nozzle, the opening amount of the warp can be reduced and the speed can be further increased, and the weft is inserted by two nozzles. If it is the type for color, it is also possible to make the textile fabric with little width fluctuation | variation by relieving the yarn shrinkage difference of the inner and outer layers of the substitute of weft cheese. Furthermore, if the weaving machine has a recent water jet loom with a loom width of about 1.5 m to 3 m, the mechanical rigidity is improved, and if there is little vibration, weaving at 500 rpm or more is the production efficiency. Above preferred.

  As the weaving structure, plain weaving, twill weaving, satin weaving, and their change weaving, weaving mixed with weaving, weaving such as multiaxial weaving are used. Of these, we have particularly excellent mechanical properties and a thin surface. The flat structure is preferable.

  The woven fabric can be scoured and washed to remove excess oil component and dirt. In the scouring step, alkali cleaning and surfactant cleaning are performed in a warm water bath, but rather, the woven fabric may be finished without scouring. In the water jet loom, the oil component is generally removed, and the fabric with a proper amount of oil component attached can be finished into a woven fabric without scouring, which is also economical. Finally, it is preferable that a warping oil or a weaving process oil mainly composed of a smoothing agent and an antistatic agent is contained in the woven fabric as an oil component. In the scouring step, it is preferable to select an appropriate scouring temperature or not to perform scouring, and the conditions may be appropriately selected depending on the properties of the woven yarn raw yarn, particularly the shrinkage rate.

  The fabric can then be dried and heat set to finish the high density fabric of the present invention. In the drying and heat setting of the woven fabric, it is preferable to control the shrinkage and the tension with respect to the width of the woven fabric and the feeding in the warp direction. For example, it is preferable to use a tenter dryer or the like, select the temperature of the heat treatment, and perform the processing while applying a tension without contracting the heat treatment. Furthermore, it is preferable to perform rapid cooling while applying tension after the heat treatment.

The high-density fabric of the present invention can also be used for an airbag without being coated with a resin or elastomer. The fabric may be calendered, but care must be taken not to cause a reduction in tearing strength, and it is preferably used without calendering. Furthermore, the high-density fabric of the present invention may be used for an airbag after being coated with a resin or an elastomer. The coating amount is preferably a lightweight coating of about 5 to 35 g / m ² , and non-breathability can be obtained with the lightweight coating. When the coating is applied, the air permeability becomes extremely low. Airbag fabrics can be produced.

The airbag fabric using the high-density fabric of the present invention is cut and sewn to provide a driver airbag, a passenger airbag, a rear airbag, a side airbag, a knee airbag, and a car seat. It can be suitably used for an intermediate airbag, a side curtain-type airbag, a rear window curtain bag, a pedestrian protection airbag, and the like. In these airbags, the reinforcing fabric used for the inflator attachment port, the vent hole portion, or the like or the member that regulates the bag deployment shape can be the same fabric as the airbag fabric. Further, in the sewing of the airbag, one or a plurality of such airbag fabrics formed by punching, fusing, or cutting can be used, and the airbag can be formed by sewing the peripheral portion thereof. Can form an airbag in which the peripheral portion is sewn by single or double sewing.
Moreover, an airbag module can be made by combining an airbag obtained by cutting and sewing the above-described airbag fabric and an inflator using an explosive or propellant.

EXAMPLES Next, although an Example and a comparative example demonstrate this invention in detail, this invention is not limited only to these Examples. About the characteristic evaluation of the high-density fabric in an Example and a comparative example, it implemented by the following method.
(1) Total fineness: Determined according to JIS-L1013: 2010, 8.3.1 positive fineness.

(2) Woven density: Determined according to JIS-L1096: 2010, Annex 11-A.
The weft density was measured at 5 points in total, 2 points 20 cm inside from the ears at both ends, 1 point at the center of the width, and 2 points between the center point of the width and each of the 20 cm inside points. Using.
The central part of the warp density is the average value of the measured values at the five central parts of the woven fabric, and the end part is measured at two points 20 cm inside from the ears at both ends. Value.

(3) Fabric ear quality: Five engineers who have been involved in the airbag business for 3 years or more put the fabric on the inspection table and make a visual judgment, and the outermost ground yarn and force yarn are organized. The looseness of the ears was classified according to the following 5 levels, and the average value of 5 people was calculated. The case where the classification was grade 3 or higher was considered acceptable.
5: In the ear part of the fabric, the ground fault thread and force thread are firmly organized, and the looseness (flare) of the ear part cannot be seen.
4: The ground fault thread and force thread are slightly closely organized, and the looseness (flare) of the ear part appears to be slight. 3: Neighboring ground yarns and force yarns are organized within a maximum of 1 mm, and the looseness of the ears (flares) is somewhat visible.
2: A state in which adjacent ground yarns and force yarns are organized within a maximum of 1 to 2 mm and there is a loosening (flare) of the ear.
1: A state in which adjacent ground fault yarns and force yarns are organized with a maximum distance of more than 2 mm, and the looseness (flare) of the ear portion appears strong.

  (4) Weaving property: The number of stoppages of the loom when the fabric was woven 50 m was examined. However, the number of stops was counted only for the number of times caused by warp looseness and warp fluff. When the number of stoppages was converted per hour, when it was 2 times or less, good pass (◯), 3-5 times passed (Δ), and 6 times or more failed (x). In addition, it was set as (x) also in the state where weaving could not be continued due to severe warp fluff and warp looseness.

(5) Air permeability (dynamic air permeability): Measurement was performed using FX3350 manufactured by TEXTEST in accordance with ASTM-D6476 at a filling pressure of 300 kPa and a filling capacity of 400 cc, and the air permeability at 50 kPa was measured.
Measured at five locations in the center of the fabric, and the average value of these was taken as the air permeability of the center, and measured at two points 20 cm inside from the ears at both ends, measured at five locations, and the average value was measured at the end. Of air permeability. Regarding the absolute value of the air permeability, it was judged that the case of 500 mm / s or less was good, and for the air permeability variation, the case where the difference between the central part and the end part was 100 mm / s or less was judged good.

(6) Air permeability (static air permeability): The air permeability at 500 Pa was measured using a perimeter meter manufactured by Toyo Seiki Seisakusho.
Measured at five locations in the center of the fabric, and the average value of these was taken as the air permeability of the center, and measured at two points 20 cm inside from the ears at both ends, measured at five locations, and the average value was measured at the end. Of air permeability. The absolute value of the air permeability is judged to be good when it is 3.0 L / dm ² / min or less, and the difference in air permeability is good when the difference between the center and the end is 1.0 L / dm ² / min or less. It was judged.

  (7) Yarn section coefficient: A ratio (L1 / L2) of the length (L1) in the longitudinal direction and the length (L2) in the transverse direction with respect to the cross section of the warp and weft forming the woven fabric. In the width direction, the average value of a total of five points was used in the width direction, two points 20 cm inside from both ends, one point at the width center, and two points at the midpoint between the width center point and each 20 cm inner point. In addition, five locations were selected at intervals of about 20 cm in the warp direction.

(8) Bending softness of fabric (A method 45 ° cantilever): Measured according to JIS-L-1096: 2010, 8.19.1A method 45 ° cantilever method.
In Table 1 showing the evaluation results of the high-density woven fabric obtained in each example, “ear part yarn fineness ratio% (ear part yarn fineness / ground part warp fineness)” is, for example, When the warp fineness of the ground portion is 470 dtex, the force yarn is 67 dtex and 33 dtex, and the ground yarn is 22 dtex (the number used is not related), “the fineness ratio% of the ear yarn (force yarn fineness) / Maximum warp fineness of the ground part) is (67/470) × 100 = 14.3%, and “Fine fineness ratio% of the ear part thread (fineness of the ear part yarn / warp fineness of the ground part) is minimum” (22 / 470) × 100 = 4.7%. The ear yarn is a generic term for force yarn and ground yarn.

[Example 1]
Fibers having a strength of 8 cN / dtex obtained by melt spinning and hot drawing of polyhexamethylene adipamide resin were used as warps and wefts of a woven fabric. This fiber had a fineness of 470 dtex, 136 single yarns, a boiling water shrinkage of 7.0%, and the number of entanglements in the water immersion method was 10 / m. The warp was warped with no twist and no glue to create a warp beam with 4382 warps. The number of force yarns at the ears was 4 on one side, 8 on both sides, the fineness of the force yarns was all 22 dtex, and the fineness of the ground fault yarn was 22 dtex. Further, the number of warp tubs (number of warps per cocoon wing) was set to 1 / wing.

The weaving machine was a water jet weaving machine, the warp tension was set to 0.32 cN / dtex, the weaving machine rotation speed was 700 rpm, and the weft was weaved using the same thread as the warp. Subsequently, the obtained raw machine was washed with water, continuously passed through a drying cylinder, and further subjected to a heat calendar. The heat calendering conditions were a metal roll temperature of 160 ° C. and a pressure of 490 N / cm. In the calender roll, the upper heating metal roll has a diameter of 12 cm, the lower roll is a 24 cm diameter roll having a paper surface, and the surface speed is the same as the vertical speed.
The evaluation results of the fabric obtained by these methods are as shown in Table 1. The flare rate was good at 0.5%, the difference in warp density of the fabric was as small as 1.0 / 2.54 cm, the air permeability and the air permeability difference at 50 kPa and 500 Pa were good, and the weaving property was also good. . In addition, the air bag made from the obtained high-density woven fabric also had good internal pressure holding performance and bag folding performance.

[Example 2]
A raw machine was obtained in the same manner as in Example 1 except that the warp tension on the loom was 0.21 cN / dtex and the fineness of the force yarn was 33 dtex. The woven green machine was processed in the same manner as in Example 1 except that it was washed with water, passed through a drying cylinder, and then heat-set without passing through a heat calendering process to obtain a woven fabric.
The evaluation results of the obtained woven fabric are as shown in Table 1. The flare ratio was good at 0.6, the warp density difference of the fabric was as small as 0.9 / 2.54 cm, the air permeability and the air permeability difference at 50 kPa and 500 Pa were good, and the weaving property was also good. . In addition, the air bag made from the obtained high-density woven fabric also had good internal pressure holding performance and bag folding performance.

[Example 3]
The warp tension on the loom is 0.38 cN / dtex, and the fineness of the force yarn is 4 for 67 dtex, 4 for 22 dtex and 4 for 22 dtex on the other ear. Except for this, a living machine was obtained in the same manner as in Example 1. The woven weaving machine was washed with water and passed through a drying cylinder to obtain a woven fabric.
The evaluation results of the obtained woven fabric are as shown in Table 1. The flare ratio was 0.7, good, the warp density difference of the fabric was as small as 1.0 / 2.54 cm, the air permeability and the air permeability difference at 50 kPa and 500 Pa were good, and the weaving property was also good. . In addition, the air bag made from the obtained high-density woven fabric also had good internal pressure holding performance and bag folding performance.

[Example 4]
A raw machine was obtained in the same manner as in Example 1 except that the number of warps was 4634, the number of force yarns was 8 on one side, and 16 on both sides. The obtained raw machine was processed in the same manner as in Example 1 to obtain a woven fabric.
The evaluation results of the obtained woven fabric are as shown in Table 1. The flare ratio was good at 0.5, the warp density difference of the fabric was as small as 1.2 pieces / 2.54 cm, the air permeability and the air permeability difference at 50 kPa and 500 Pa were good, and the weaving property was also good. . In addition, the air bag made from the obtained high-density woven fabric also had good internal pressure holding performance and bag folding performance.

[Example 5]
Except that the number of warps was 3938, the warp tension was 0.26 cN / dtex, the fineness of the force yarn was 33 dtex, 8 on one side, 16 on both sides, and the number of warp ridges was 2 / blade. And weaving in the same manner as in Example 1 to obtain a green machine. The obtained raw machine was washed with water and treated with a drying cylinder, and then heat-treated to obtain a woven fabric.
The evaluation results of the obtained woven fabric are as shown in Table 1. The flare ratio was 0.1%, the warp density difference of the fabric was as good as 0.8 / 2.54 cm, the air permeability and the air permeability difference at 50 kPa and 500 Pa were good, and the weaving property was also good. In addition, the air bag made from the obtained high-density woven fabric also had good internal pressure holding performance and bag folding performance.

[Example 6]
Weaving in the same manner as in Example 4 except that the fineness of the force yarn was 2 from 118 dtex on one side (4 on both sides) and 4 on 67 dtex yarn (8 on each side). The obtained green machine was processed in the same manner as in Example 1 to obtain a woven fabric.
The evaluation results of the obtained woven fabric are as shown in Table 1. The warp density difference of the fabric was as small as 1.5 / 2.54 cm, the flare rate was good at 1.0, the air permeability and the air permeability difference at 50 kPa and 500 Pa were good, and the weaving property was also good. . In addition, the air bag made from the obtained high-density woven fabric also had good internal pressure holding performance and bag folding performance.

[Example 7]
The same procedure as in Example 1 was performed except that the number of warp sachets was set to 2 / feather.
The evaluation results of the obtained woven fabric are as shown in Table 1. The warp density difference of the fabric was as good as 1.2 pieces / 2.54 cm, but the flare rate was 1.1. The air permeability and the air permeability difference between the fabrics at 50 kPa and 500 Pa were also good. There was no problem in weaving although some warp loosening was observed in the ear. In addition, the air bag made from the obtained high-density woven fabric also had good internal pressure holding performance and bag folding performance.

[Example 8]
The fineness of 235 dtex is used for the warp, the number of warps is 7164, the warp tension is 0.26 cN / dtex, the number of warps is 2 / wing, the force is 6 on one side and 12 on both sides. Except for this, weaving was performed in the same manner as in Example 1, and the obtained green machine was treated in the same manner as in Example 1 to obtain a woven fabric.
The evaluation results of the obtained woven fabric are as shown in Table 1. The difference in warp density of the fabric was as small as 0.7 / 2.54 cm, the flare rate was 0.7, good, the air permeability and the air permeability difference at 50 kPa and 500 Pa were good, and the weaving property was also good. . In addition, the air bag made from the obtained high-density woven fabric also had good internal pressure holding performance and bag folding performance.

[Example 9]
Using a polyethylene terephthalate fiber with a fineness of 550 dtex, a single yarn of 240, a boiling water shrinkage of 2.2%, and a number of entanglements of 10 / m, a warp beam of 4290 warps was created, and a water jet loom was The warp tension is 0.32 cN / dtex, the fineness of the force yarn is 22 dtex on one side, 8 on both sides, the ground fault yarn is 22 dtex, the loom speed is set to 600 rpm, and the weft is the same fiber as the warp Was used for weaving. The obtained raw machine was processed in the same manner as in Example 1 to obtain a woven fabric.
The evaluation results of the obtained woven fabric are as shown in Table 1. The difference in warp density of the woven fabric was as small as 0.5 pieces / 2.54 cm, the flare rate was 1.3, the air permeability and the air permeability difference at 50 kPa and 500 Pa were good, and the weaving property was also good. In addition, the air bag made from the obtained high-density woven fabric also had good internal pressure holding performance and bag folding performance.

[Example 10]
Weaving was performed in the same manner as in Example 1 except that the warp tension on the loom was set to 0.46 cN / dtex, and the resulting green machine was treated in the same manner as in Example 1 to obtain a woven fabric.
The evaluation results of the obtained woven fabric are as shown in Table 1. The warp density difference of the woven fabric is a little as large as 1.9 pieces / 2.54 cm. The flare rate is good at 0.9, and the air permeability and air permeability difference of the fabric at 50 kPa and 500 Pa are also good. Due to the occurrence of warp and fluff, weaving was slightly poor. In addition, the air bag made from the obtained high-density woven fabric also had good internal pressure holding performance and bag folding performance.

[Comparative Example 1]
The same operation as in Example 2 was performed except that the warp tension on the loom was 0.16 cN / dtex.
The evaluation results of the obtained woven fabric are as shown in Table 1. The warp density difference of the woven fabric is as good as 1.7 / 2.54 cm, but the flare rate is as bad as 1.8. The air permeability difference of the fabric at 50 kPa was large. Due to the occurrence of warp looseness, the weaving property was slightly poor. In addition, the air bag made from the obtained high-density fabric had poor internal pressure retention performance and good bag folding performance.

[Comparative Example 2]
The same operation as in Example 1 was performed except that the force yarn was not used.
The evaluation results of the obtained woven fabric are as shown in Table 1. The warp density difference of the woven fabric is as good as 1.1 / 2.54 cm, but the flare rate is not as good as 2.2. The air permeability and the air permeability difference between the fabrics at 50 kPa and 500 Pa were good, but the weaving property was poor due to the occurrence of loose warp at the ear. In addition, the air bag made from the obtained high-density woven fabric also had good internal pressure holding performance and bag folding performance.

[Comparative Example 3]
It was carried out in the same manner as in Example 1 except that the fine yarn had a fineness of 235 dtex, two on one side and four on both sides, and the warp tension on the loom was 0.26 cN / dtex.
The evaluation results of the obtained woven fabric are as shown in Table 1. The warp density difference of the fabric is good at 0.8 pieces / 2.54 cm, but the flare rate is not good at 2.1. The air permeability and the air permeability difference between the fabrics at 50 kPa and 500 Pa were good, but the weaving property was poor due to loosening of the ears. In addition, the air bag made from the obtained high-density woven fabric also had good internal pressure holding performance and bag folding performance.

[Comparative Example 4]
The same procedure as in Example 1 was carried out except that 67 dtex was used for the force yarn, one on one side and two on both sides, the fineness of the ground fault yarn was 56 dtex, and the number of warps was 3700.
The evaluation results of the obtained woven fabric are as shown in Table 1. The warp density difference of the woven fabric was 0.6 / 2.54 cm, and the flare rate was 1.0. Although weaving was also good, the air permeability of the fabric at 50 kPa and 500 Pa was large, and the difference in air permeability at 50 kPa was also large. In addition, the air bag made from the obtained high-density fabric had poor internal pressure retention performance and good bag folding performance.

[Comparative Example 5]
The same procedure as in Example 1 was performed except that the warp fineness was 490 dtex and 4740 warps were used.
The evaluation results of the obtained woven fabric are as shown in Table 1. The warp density difference of the woven fabric was as good as 1.3 / 2.54 cm, and the flare rate was also as good as 1.5. The air permeability and the air permeability difference between the fabrics at 50 kPa and 500 Pa were also good. However, there was an ear looseness and the weaving property was slightly poor. In addition, the airbag made from the obtained high-density fabric had good internal pressure holding performance, but the bag folding performance was poor.

表１から明らかなように、本発明の織物は幅方向に密度差や通気度差が少ない非常にすぐれた織物特性を示すとともに、製織性も良好であるという特長を有している。

As is apparent from Table 1, the fabric of the present invention has the characteristics that it has very good fabric characteristics with little difference in density and air permeability in the width direction, and has good weaving properties.

  The present invention relates to a high-density fabric and a method for weaving the same, and is particularly suitable as a high-density fabric for airbags and a method for weaving the same for occupant safety by absorbing shocks in a vehicle collision accident.

Claims (11)

  The warp and the weft are composed of a synthetic fiber multifilament yarn having a fineness of 210 to 750 dtex, and are a plain fabric having a cover factor in the range of 2000 to 2500, and the flare ratio in the warp direction at the end of the fabric is 0 to 1.5. A high-density fabric characterized by   2. The high-density fabric according to claim 1, wherein a difference in warp density between a center portion and an end portion of the fabric is 2.0 / 2.54 cm or less.   As for the ears of the fabric, 2 to 24 yarns having a fineness in the range of 3 to 30% of the warp fineness of the ground are used as the force yarns and 4 as the grounding yarns in each of the left and right ears. The high-density fabric according to claim 1 or 2, characterized by the above.   The high-density fabric according to any one of claims 1 to 3, wherein the width of the fabric is 2.0 m or more.   The high-density fabric according to any one of claims 1 to 4, wherein the warp and weft yarns constituting the fabric are in a range of 1.5 to 4.0.   The high-density fabric according to any one of claims 1 to 5, wherein the warp and the weft are at least one type of fiber selected from polyamide-based continuous fibers and polyester-based continuous fibers.   Polyamide continuous fiber and polyester continuous fiber are selected from polyamide 6 continuous fiber, polyamide 66 continuous fiber, polyamide 46 continuous fiber, polyethylene terephthalate continuous fiber, polybutylene terephthalate continuous fiber, polytrimethylene terephthalate continuous fiber, polyethylene naphthalate continuous fiber The high-density fabric according to claim 6, wherein the high-density fabric is at least one kind of fiber.   The method for producing a high-density fabric according to any one of claims 1 to 7, wherein a warp tension in the weaving step is 0.20 cN / dtex to 0.45 cN / dtex.   The method for producing a high-density woven fabric according to claim 8, wherein the number of warp yarns in the weaving step is 1 / wing. The method for producing a high-density fabric according to claim 8 or 9, wherein the weaving step includes at least the following conditions (a) and (b).
(A) Use a water jet loom with one or two wefts.
(B) Weaving at a loom speed of 500 rpm or more.   The airbag which used the high-density fabric as described in any one of Claims 1-7 for at least one part.