JP2006063491A - Ground fabric for resin coated airbag and method for producing ground fabric for resin coated airbag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ground fabric for airbags, which controls sieve opening by uniform yarn slippage even in abruptly expanding and deploying an air bag and limits yarn slippage resisting power to a small range so as to avoid fear of causing local internal pressure concentration leading to a local break. <P>SOLUTION: A synthetic fabric woven by a water-jet loom is provided with a diluted synthetic resin liquid, a resin foam or a foamed resin liquid, the fabric is thermally stabilized to give a plurality of fabrics, the peripheral parts of the fabrics are sewed with laying a resin coated surface formed on at least one side of each fabric inside to make a bag-like shape, the seam slippage resisting power of sewing thread in sewing is adjusted to 3-8mm range and a specific value of air permeability is adjusted to 0.001-0.250cc/cm<SP>2</SP>/sec in the case of air permeation test using an air permeability tester under high differential pressure condition of 124Pa-200kPa. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a woven fabric densely woven used for the purpose of ensuring safety for passengers or pedestrians caused by vehicle collision accidents, obstacles during driving or collision accidents to pedestrians, etc. The present invention relates to a base fabric for a resin-coated airbag in which at least one surface side is subjected to a resin coating treatment, and a method for producing a base fabric for a resin-coated airbag.

  In recent years, in the event of a vehicle accident, various airbags have been developed to ensure the safety of passengers, pedestrians, etc., and they are rapidly becoming popular because of their extremely high effectiveness and are installed in most vehicles. It is up to.

  In today's various airbags, the fabrics are softer with the aim of ensuring the heat resistance and flame retardancy and the ability to be folded into a compact and lightweight. In addition, there is a demand for low ventilation characteristics such as a highly airtight woven fabric so that inflation gas at a high temperature does not leak rapidly to the passenger side.

  In order to satisfy such a requirement, it is conceivable to reduce the number of deniers of the yarn to be used or to thermally shrink the woven fabric to improve the weaving density.

  In order to ensure low air permeability, it is also considered that at least one surface side of the fabric is provided with a resin coating treatment or a resin coating function (for example, see Patent Documents 1 to 3).

  In the technique disclosed in Patent Document 1, a resin film coating is applied to one side of a woven fabric in which multifilaments of synthetic fibers of 500 denier or less are woven, and the slip resistance (seam slip resistance) of the airbag base fabric is 8 to 20 mm. It states that it is a range.

  Although the grounds that this slip resistance (seam slip resistance) should be in the range of 8 to 20 mm are not disclosed, those skilled in the art consider as follows. That is, it has been pointed out that the high-temperature high-pressure gas propagated by the combustion of the explosive expansion gas agent from the inflator is likely to cause stress concentration toward the weakest part that has been subjected to the airbag sewing process.

  This is because it is difficult to alleviate the generated stress of the high-temperature and high-pressure gas ejected in a specific direction only by the sewing means of the continuation of the through holes formed in the sewing portion by the sewing machine needle and the sewing thread. When the airbag base fabric is inflated and deployed instantaneously and the internal pressure of the airbag base cloth reaches the maximum value, the fragile part of the airbag base cloth itself is caused to a certain extent by evenly causing gas leakage from the stitched portion of the airbag due to the yarn slip phenomenon. It can be a means to prevent local burst damage from.

  Patent Document 2 discloses a specific technique for preventing the airbag base fabric from bursting.

  In the technology disclosed in Patent Document 2, the first base fabric and the second base fabric, which are formed from a woven fabric and are sewn around each other, have at least their stitched portions both formed from a single-layer woven fabric. The warp of the first base fabric and the warp of the second base fabric and the weft of the first base fabric and the weft of the second base fabric intersect each other at the stitching portion, and the direction of the first folding of the airbag is The first and second base fabrics are folded so as to be inclined with respect to the respective warp and weft yarns.

  In addition, the crossing angle between the warp and the second base fabric of the first base fabric and the crossing angle between the weft of the first base fabric and the weft of the second base fabric at the stitching portion are set to approximately 45 degrees, The slanting angle between the first folding direction of the airbag and the warp and weft of each of the first and second base fabrics is set to about 22.5 degrees, which is a weak point of the bag body stitching portion of the airbag. It is said that the yarn slip phenomenon occurs uniformly while complementing, and the effect of alleviating the maximum internal pressure of the gas ejected from the initial inflator where a rapid expansion and expansion occurs.

  From these descriptions, the present inventor found that there is a significant difference in stiffness and slip resistance depending on the weaving method in the warp direction and the weft direction, whether it is a resin-coated product or an uncoated product. The warp crimp is given by the total tension at the time of weaving, so if the denier is the same, the total tension is lower, and the lower the weaving density, the lower the binding force of the yarn. As a result of research by the present inventors, it has been found that yarn slip is likely to occur.

  In addition, the air bag mounting has improved the pressure resistance at the time of initial inflation and deployment of the airbag starting from the sewing through hole due to the influence of the sewing thread and sewing needle during sewing processing than when moderate thread sliding does not cause thread sliding at all. We think that local burst fracture at the time can be avoided.

In addition, the technique disclosed in Patent Document 3 as a technique in which resin coating treatment is not directly performed is a method in which yarns made of polyamide fibers are woven using a water jet loom, and the woven fabric is kept dry without being dried. By performing the shrinkage heat treatment with the heated steam, the fabric after the shrinkage heat treatment has an air permeability of 0.5 cc / cm ² / sec or less under 124 Pa.

Japanese Patent No. 3480585 Japanese Patent No. 3028524 Japanese Patent No. 3413702

  By the way, as pointed out in the description of Patent Documents 1 and 2, the combustion agent reaction gas for inflating and deploying the high-temperature and high-pressure airbag base fabric generated from the inflator is stitched so as to achieve an appropriate yarn sliding effect. As the inner pressure increases, thread slipping progresses as the internal pressure increases, and the synthetic fiber structure collapses and stretches. The most fragile part appears as an element that extremely collapses the structure, especially when the thread direction of the woven fabric and the direction in which the load is applied to the base fabric are orthogonally different from each other by 0 degrees and 90 degrees of the stitched area. become.

  In order to solve this problem, in order to relieve the load applied to the base fabric, a sewing process in which the seam is inclined at 45 degrees is effective, but it does not make sense when the opening phenomenon is particularly large. Absent.

  In other words, a conventional base fabric that causes a large thread slip with a sliding resistance of 8 to 20 mm is likely to generate a part where the internal pressure is locally evacuated to the stitched portion to which a load is applied. Even if no measures such as use are taken, it is desirable to reduce the thickness of the woven structure and the resin coat so that the yarn slips evenly to some extent.

  Also, by improving the weaving structure and reducing the coat thickness, the flexibility of the base fabric is improved and the overall weight can be reduced, so it is synergistically preferred for the purpose of reducing weight and size. It can be said that it has an effect.

  In addition, there are various types of resin coating materials (elastomers) applied to the base fabric, such as knife coating and dipping methods, but in the first place, inhomogeneous components or viscosities of solids and liquid substances in the resin liquid are mixed slightly differently. If there is an object, there is a risk of forming a through-hole that is smaller than the visible level during the drying and heat stabilization process, or the coating thickness may change drastically, and the coating solution will precipitate. And must be homogenized sufficiently to avoid protruding solids.

  Such resin coating liquids are classified into a silicone emulsion type as shown in FIG. 1 and a two-component mixed type as shown in FIG. In the silicone emulsion type, it was difficult to apply uniformly to the entire fabric because it was only mechanically stirred by the starter mixer 1 etc. just before being applied using a crosslinking accelerator or thickener. It has been one factor that increases the manufacturing cost by causing coating spots, inhomogeneous layers, or coating omission due to insufficient stirring, causing loss that cannot be used in actual use.

  Further, the technique disclosed in Patent Document 3 is intended to improve the airtightness without significantly impairing the heat resistance without applying a resin coating treatment. A certain amount of high tension is applied in the warp direction to reduce the weave density. Furthermore, the heat shrink effect of the fiber itself is promoted by the heat conduction effect of the superheated steam to obtain a low air permeability fabric, and it is characterized by discontinuous treatment.

  However, in the case of being produced on a normal water jet loom, a non-continuous heat treatment of a fabric consisting of a considerable number of looms may cause adhesion of foreign matters in the wet state, growth of fine wrinkles, and color contamination. It is easy to occur, and if it is not dried in a short time, it leads to quality deterioration, which is not preferable.

  In addition, the heating steam is locally ejected to cause the thermal contraction action over the entire woven fabric, which requires extremely high control in relation to the number of steam and the distance between the woven fabrics, and shrinkage more than necessary. There is a possibility that the inconvenience that the airtightness of the base fabric is not satisfied locally at the portion where the heat is generated and the portion where heat is not evenly distributed and concentrated or where the heat is insufficient may occur.

  Furthermore, since Patent Document 3 does not disclose a means for preventing a temperature difference from the outside air, in order to satisfy the low ventilation characteristics, the thermal contraction of the woven fabric is required when a normal production means is used. In order to achieve this, a process of passing through a heat treatment tank for ejecting heated steam a plurality of times is required, and the disadvantage of reducing productivity and efficiency occurs.

  Accordingly, a first object of the present invention is to control the opening due to uniform thread slip even in the case of rapid inflation and deployment of an airbag, and to avoid the possibility of local bursting due to local concentration of internal pressure. It aims at providing the base fabric for airbags which can limit a slip resistance to a small range.

  In addition, the second object of the present invention is to provide a high airtightness that other airbag base fabrics have not achieved by improving the weave structure and achieving low air permeability associated with homogenization of the resin coating agent. Thus, an object of the present invention is to provide a method for manufacturing a base fabric for an air bag having excellent high-pressure gas slow leak control characteristics in applications such as curtain air bags.

  In order to solve the above-mentioned problems, the base fabric for a resin-coated airbag according to the first invention of the present application is formed into a bag shape by sewing a peripheral portion with a resin-coated surface applied to at least one surface of a plurality of fabrics as an inner surface. The resin-coated airbag base fabric is characterized in that the seam slip resistance of the sewing thread at the time of sewing is in the range of 3 to 8 mm.

The base fabric for a resin-coated airbag according to the second invention of the present application is for a resin-coated airbag that is formed into a bag shape by sewing a peripheral portion with a resin-coated surface applied to at least one surface of a plurality of fabrics as an inner surface. In the base fabric, the air permeability characteristic value in the range of 0.001 to 0.250 cc / cm ² / sec when the air permeability test using the air permeability tester under a high differential pressure condition of 124 Pa to 200 KPa is performed. It is characterized by that.

The base fabric for a resin-coated airbag of the third invention of the present application is the resin, wherein the fabric is composed of yarns having a single yarn fineness of 1 to 8 denier and a total fineness of 100 to 500 denier and applied to at least one side. The adhesion amount of the synthetic resin film on the coated surface is 10 to 50 g / m ² .

  The base fabric for a resin-coated airbag of the fourth invention of the present application is characterized in that the warp and weft pull-out resistance of the fabric is in the range of 300 to 700N.

The base fabric for a resin-coated airbag according to the fifth invention of the present application has a fabric weight of 200 g / m ² or less, a thickness of 0.50 mm or less, a tensile strength of 3000 N or more, a breaking elongation of 15% or more, and a tear strength of 300 N or more. It is characterized by being.

  According to the sixth aspect of the present invention, there is provided a method for producing a base fabric for a resin-coated airbag, wherein a synthetic resin diluted solution, a resin foam or a resin foam solution is applied to a fabric composed of synthetic fibers woven with a water jet loom, and then the thermal stability of the fibers is achieved. It is characterized in that the processing is performed.

  According to a seventh aspect of the present invention, there is provided a method for producing a base fabric for a resin-coated airbag, wherein at least one surface of the fabric is subjected to a heat stabilization treatment after coating with a liquefied material homogenization method of a steam mist containing a synthetic resin. It is characterized by.

  According to an eighth aspect of the present invention, there is provided a method for producing a base fabric for a resin-coated airbag, wherein the resin dilution liquid or the resin foaming liquid made of the synthetic resin contains a synthetic resin content of 0.5 to 60% by weight in solid content, and is mixed. The component that promotes the stirring and homogenizing action is a steam foaming action.

  According to a ninth aspect of the present invention, there is provided a method for producing a base fabric for a resin-coated air bag, wherein the thermal stabilization treatment is performed in a plurality of steps in the range of room temperature to 220 ° C. .

  According to the base fabric for a resin-coated airbag of the first invention of the present application, the stitching slip resistance of the sewing thread when the peripheral portion is sewn with the resin-coated surface applied to at least one surface of the plurality of fabrics as the inner surface In the range of 3 to 8 mm, it is possible to improve the gas leakage and local burst of the combustion agent reaction gas when the high-temperature and high-pressure airbag base fabric generated from the inflator is inflated and deployed.

According to the base fabric for a resin-coated airbag of the second invention of the present application, the resin-coated air is formed into a bag shape by sewing the peripheral portion with the resin-coated surface applied to at least one surface of the plurality of fabrics as the inner surface. The air permeability characteristic value when the base fabric for a bag is subjected to an air permeability test using a gas permeability tester under a high differential pressure condition of 124 Pa to 200 KPa is in a range of 0.001 to 0.250 cc / cm ² / sec. By making it inside, the leakage property can be improved.

According to the base fabric for a resin-coated airbag of the third invention of the present application, the single yarn fineness of the fabric is 1 to 8 denier and the total fineness is 100 to 500 denier, and is applied to at least one side. By setting the adhesion amount of the synthetic resin film on the resin coat surface to 10 to 50 g / m ² , the local burst and the leak property can be improved more strictly.

  According to the base fabric for a resin-coated air bag of the fourth invention of the present application, the local rupture and leakage are improved more strictly by setting the pullout resistance of the warp and weft of the fabric to be in the range of 300 to 700N. Can do.

According to the base fabric for a resin-coated airbag of the fifth invention of this application, the fabric has a basis weight of 200 g / m ² or less, a thickness of 0.50 mm or less, a tensile strength of 3000 N or more, and a breaking elongation of 15% or more. By setting the strength to 300 N or more, it is possible to improve the flexibility and weight of the airbag base fabric.

  According to the sixth aspect of the present invention, there is provided a method for producing a base fabric for a resin-coated airbag, wherein a synthetic resin diluted solution, a resin foam or a resin foam solution is applied to a fabric composed of synthetic fibers woven with a water jet loom, and then the thermal stability of the fibers is achieved. The manufacturing cost can be reduced by performing the conversion treatment.

  According to a seventh aspect of the present invention, there is provided a method for producing a base fabric for a resin-coated airbag, wherein at least one surface of the fabric is subjected to a heat stabilization treatment after coating with a liquefied material homogenization method of a steam mist containing a synthetic resin. This prevents the formation of through-holes that are smaller than the visible level during the heat stabilization process, and also causes drastic changes in coating thickness, precipitation of coating liquid, and protrusion of solids. It can be avoided.

  According to the method for producing a base fabric for a resin-coated airbag of the eighth invention of the present application, the resin dilution liquid or resin foaming liquid made of a synthetic resin contains 0.5 to 60% by weight of the synthetic resin content as a solid content. Since the component that promotes the mixing and homogenizing action is the steam foaming action, the resin coat can be uniformly applied to the entire woven fabric.

  According to a ninth aspect of the present invention, a method for producing a base fabric for a resin-coated air bag includes a step of performing thermal shrinkage stabilization in a plurality of steps in a range of room temperature to 220 ° C. It can be applied more uniformly over the entire fabric.

  In order to solve each problem, the present inventors first analyze the current product in detail and analyze its ability value, and further, the state of the fiber bundles that form these raw materials, and the heat before and after the resin is applied When evaluating the deterioration, foaming, filling degree, and degree of homogeneity of the film due to the history, electron microscope observation and aeration characteristic test were conducted with particular emphasis.

In other words, the fiber weave structure is confirmed with an electron microscope, and accurate coating quality information is obtained depending on the degree of driving, fiber bundle disturbance and crimping, abnormal part deformation, cross-sectional shape, and presence of through-holes on the back of the coat part. It is possible.
In this embodiment, the seam slip resistance is JIS L1096 8.21.1. The test piece was loaded with 1177N by a method based on the method A, and the opening due to expansion and deployment was simulated. For the air permeability test under the condition of 124 Pa and a high differential pressure of 200 Kpa, a product made by famous Kato Tech Co., Ltd. (AUTOMATIC AIR-PERMEABILITY TESTER KES-F8-AP1 was adopted. In L1096 8.27.1A method (Fragile method), it is usually below the measurement limit for coated products, and the pin pull-out resistance is in accordance with JIS L1096 8.21.3. L1096 8.16.2B method According to the constant-speed extension method, tensile strength and elongation are JIS L1096 8.12.1A method, tear strength is JIS L1096 8.15.1.A-1 method (single tongue method) Values for the warp and weft directions are obtained and described.

  The airbag fabric made of the synthetic fiber of the present invention is selected according to the construction of nylon 66, nylon 6, nylon 46, and polyethylene terephthalate fiber, and has a fabric strength that can withstand momentary inflation and expansion of high-temperature gas, particularly It is important that the burst strength, tear strength, and the like are satisfied, and the single yarn fineness is 1 to 8 denier or the total fineness is 100 to 500 denier to absorb the impact when the inflated airbag comes into contact with the passenger. While trying to make it quite small, it tries to absorb more impact energy using a high degree of polymerization polymer. However, in the present invention, if the single yarn fineness is made smaller than 1d, the strength becomes too weak and it is not suitable for airbag use.

  Further, if it is larger than 8 denier, the flexibility is hindered, which is inconvenient for a driver module or a side curtain type airbag that can be stored compactly, so the range is 1 to 8 denier. When the total fineness is smaller than 100 denier, the burst strength is not satisfied, and the heat resistance is deteriorated. If it is larger than 600 denier, it is somewhat difficult to handle from the viewpoint of productivity of the water jet loom of the present invention, desirably 500 denier or less, and most preferably 420 denier or less. In addition, if it does not depend on the specification in the place limited especially, it can use without a problem in both the warp and weft directions by the fineness structure of 100-500 denier.

  The base fabric woven in the water jet loom with tension applied so as not to cause defects at the intersecting parts in the warp and weft directions is attached to the rotating mechanism with a moving device, and controlled to 120 ° C or less simultaneously with hot air drying at 80 ° C. Water was removed by superheated roller heating and passed through a silicon resin elastomer coating equipment that had been homogenized in advance.

  Here, steam bubbling in a process that is not shown in the figure is always performed so that the coating thickness does not change due to deposition of deposits, evaporation residues, solid mass, etc., before the silicone resin elastomer is applied. The coating liquid in the silicon coating liquid retention tank is stirred and homogenized.

  Regardless of normal compressed air bubbling, the purpose of jetting steam mist is to keep the stirring temperature constant throughout the year to reduce the rate of change of coating conditions, and to apply coating spots and foreign matter to the base fabric due to the influence of heterogeneous products. This is to prevent the cause of damage from occurring. Steam mist not only maintains the temperature of the coating solution and homogenizes the mixture, but also prevents the generation of fine dust bubbles during steam foaming and the surface modification of the coating solution to maintain the cleanliness of the coating solution surface and suppress the formation of a foreign film called smear. It also acts on preheating of the base fabric, and also has a synergistic effect of promoting drying of the coating agent applied to the base fabric until the next step.

  The resin dilution liquid or resin foaming liquid made of this synthetic resin may be of the A / B 2 liquid mixture type shown in FIG. 2 or the water-soluble emulsion type shown in FIG. In order not to leave a residue, 0.5 to 60% by weight, more preferably 50% by weight or less of solid content is used by mixing with clean water. The use of steam mist is preferable because it can completely eliminate the influence of outside air (40 ° C. to −30 ° C.) in summer and winter and consideration of the natural environment in the country where the fabric is made.

  In FIG. 1, 1 is a stirring mixer, 2 is a solution supply trough, 3 is a coater, 4 is a back roll, 5 is a base fabric, and 6 is a dry cure furnace. Here, the viscosity is increased by mixing and stirring silicon emulsion (emulsion) + thickening agent + crosslinking accelerator + pigment. At this time, the stirring mixer 1 is rotated at high speed for homogenization. Thereby, it can be set as high viscosity and precipitation is prevented. The solution is stored at 18 ° C. and used within 12 hours after thickening.

  In FIG. 2, 7 and 8 are metering pumps, and 9 is a static mixer that applies the solution to the base fabric 5 while mixing both the A and B solutions. Here, the liquid A and the liquid B are supplied from separate containers to the static mixer 9 installed above the coater 3 by the metering pumps 7 and 8, and are continuously mixed immediately before coating.

  The inventors of the present application applied to a base fabric by water jet loom weaving, in which a 4.5 denier single yarn and a 420 denier warp and weft yarn are applied with a yarn tension twice to three times higher than usual to make a high density weave. Using a base fabric coated and applied with a high degree of cleanliness different from normal, room temperature to 80 ° C is about 30 seconds, 80 to 150 ° C is 60 seconds, and further 150 to 220 ° C is about 15 seconds. As shown in FIG. 3, a set of seven heat treatment stabilization furnaces 210 to 220 ° C. at a temperature of 10 to 220 ° C. is set, and the base fabric 5 is allowed to pass through the processing furnace in about 15 seconds so as to be non-contacting. In a subsequent process, the product was wound into a beam and the line speed was set to 50 m / min with the same specifications as usual, and a roll finished product with a width of 1600 mm was obtained.

  In FIG. 3, 11 is a supply roll, 12 is an accumulator, 13 is a heat set, 14 is a cooling cylinder, 15 is a coater, and 16 is a take-up roller. The reason why the temperature was raised step by step is that a water dispersion system (solid content 40% by weight, moisture 60% by weight) is used. This is because the peel strength of the material deteriorates.

  For comparison, a 4.5 denier single yarn and 420 denier warp and weft were used and a base fabric woven by water jet loom with a warp tension of 1/2 or less than usual was used. Based on this, coating, drying, and heat shrinkage stabilization treatment were performed, and a roll product having a product width wound around a roller was obtained in a subsequent process.

  For other comparisons, an airbag base fabric obtained by a manufacturing method other than water jet weaving was obtained, and a test piece according to JIS regulations was collected and evaluated in the same manner.

  Further, in the module assembling stage, a sewing process and an installation folding angle are adopted so as to have an inclination of 22.5 ° to 45 ° for visual alignment confirmation when obtaining the folding angle.

  These comparison lists are shown in Table 1.

  In Table 1, WJL in the column of weaving method indicates a weaving method using a water jet loom, AJL indicates a weaving method using an air jet loom, and REPIA indicates a weaving method using a rapier loom. Since the other resin coating processes follow the conventional specifications irrespective of the present invention, the slip resistance is more than twice as large as that of the water jet weaving method in the examples, and the steepness of the inflation gas. At the time of inflating and expanding, the seam slip of the stitching portion increases due to the concentration of internal pressure stress, which may cause high temperature gas leakage to the passenger side, which is not preferable.

  In Comparative Example 2, the total denier 630d woven by water jet is within a suitable range for seam slip due to slip resistance, and the ventilation characteristics are low and the ventilation characteristics are good. However, since the flexibility is poor and the bending resistance is 105 mm, a slightly hard impression is received, so the target of 80 mm or less is not satisfied.

  In Examples 1 to 4, all of the required specifications are substantially satisfied, and especially those obtained by adjusting the tension in the warp direction have excellent characteristics in terms of sliding resistance and ventilation characteristics as compared with others. As a low-breathing fabric for airbags, it is most suitable for curtain airbag applications that are required to continue inflating and deploying for a long time.

  The silicone-coated elastomers in Examples 1 to 4 corresponding to the product of the present invention were all homogeneously stirred in all coating steps, and there was no precipitation of separated precipitation products in the mixture. Uniform application to the surface of the fabric has been achieved, coating unevenness has been improved, and the local imbalance of the aeration characteristics due to thick coating and thin wall has been significantly improved, so the measured value can be measured almost anywhere. Since there is no discrepancy and a constant airflow characteristic value is obtained, this clearly shows that the coating quality has been dramatically improved. On the other hand, in comparative values 1 to 5 of the conventional specification, in the roll product, the ventilation characteristics of the center part are relatively low at the edge part and the center part, but the ventilation part is at the end part (both ears side). As a result of electron microscopic observation, it was found that there was a leak site due to foaming from through-holes and elastomers and coating spots. In other words, there is an improper cause of rapid heating and heat treatment shrinkage stabilization conditions after application of the resin coat, and there is no consideration for the formation of elastomer through-holes in the base fabric itself due to foaming or cracking. It is thought that it occurred.

  As a result, it is possible to apply an evenly thin film thickness over the entire base fabric, and sufficiently satisfy the initial target base fabric thickness of 0.5 mm or less. Even including the film, it is 0.35 mm or less.

  The base fabric of the present invention has a high tensile strength of 3000 N or higher, a breaking elongation of 15% or higher, and a tear strength of 300 N or higher. It is well understood that it has characteristics.

  As described above, the base fabric for resin-coated airbags and the method for producing the same according to the present invention has low ventilation performance with excellent leak characteristics that require long-time inflation and deployment, such as future curtain airbags. In addition, in the base fabric formed by sewing the end portions in a bag shape so that the resin-coated surfaces of the base fabric sewn on the airbag face each other, the stitching slip resistance of the sewing thread in the base fabric is A moderately uniform yarn slip phenomenon occurs from the tank pressure test in the range of 3 to 8 mm, and the local concentrated gas escape phenomenon is avoided. Therefore, it is preferable to replace the conventional base fabric that generates yarn slip with high slip resistance. It became clear that it would bring direction.

  In addition, according to the base fabric for resin-coated airbags and the manufacturing method thereof according to the present invention, the conventional manufacturing defects are eliminated, the weight is reduced, the flexibility is improved, and the workability is improved easily and easily. This contributes to reducing the overall work loss time and waste loss, and is effective for reducing manufacturing costs. It can be suitably used for a bag base fabric.

  Therefore, a silicon-based elastomer resin coat that combines light weight and flexibility that could not be achieved with conventional airbags, excellent burst resistance, and low air permeability and high airtightness was applied. An airbag base fabric can be provided.

It is explanatory drawing of the resin coat liquid supply apparatus of a water-soluble emulsion type. It is explanatory drawing of the resin coating liquid supply apparatus of a 2 liquid mixing type. It is explanatory drawing of a drying furnace.

Explanation of symbols

  5 ... Base fabric (fabric)

Claims (9)

In a base fabric for a resin-coated airbag that is formed into a bag shape by sewing a peripheral portion with the resin-coated surface applied to at least one side of a plurality of fabrics as an inner surface,
A base fabric for a resin-coated airbag, wherein the stitch slip resistance of the sewing thread at the time of sewing is in the range of 3 to 8 mm. In a base fabric for a resin-coated airbag that is formed into a bag shape by sewing a peripheral portion with the resin-coated surface applied to at least one side of a plurality of fabrics as an inner surface,
The air permeability characteristic value when the air permeability test using the air permeability tester under a high differential pressure condition of 124 Pa to 200 KPa is performed is within the range of 0.001 to 0.250 cc / cm ² / sec. Characteristic base fabric for resin-coated airbags. The fabric is composed of yarns having a single yarn fineness of 1 to 8 denier and a total fineness of 100 to 500 denier, and the amount of the synthetic resin film on the resin-coated surface applied on at least one side is 10 to 50 g / m. ^The base fabric for a resin-coated airbag according to claim 1, wherein the base fabric is a resin-coated airbag. The base fabric for a resin-coated airbag according to any one of claims 1 to 3, wherein a pulling resistance force of the warp and weft of the fabric is in a range of 300 to 700N. 5. The fabric according to claim 1, wherein the fabric has a basis weight of 200 g / m ² or less, a thickness of 0.50 mm or less, a tensile strength of 3000 N or more, a breaking elongation of 15% or more, and a tear strength of 300 N or more. A base fabric for a resin-coated airbag according to any one of the above. Manufacture of a base fabric for a resin-coated airbag, characterized by applying a synthetic resin diluent, a resin foam or a resin foam to a fabric made of synthetic fibers woven by a water jet loom, followed by heat stabilization treatment of the fibers Method. The base fabric for a resin-coated airbag according to claim 6, wherein at least one surface of the fabric is coated with a steam mist liquefied material homogenization method containing a synthetic resin and then heat-stabilized. Production method. The resin dilution liquid or resin foaming liquid made of the synthetic resin contains 0.5 to 60% by weight of a synthetic resin content in solids, and the component that promotes the mixing and stirring homogenization action is a steam foaming action. The manufacturing method of the base fabric for resin coat airbags of Claim 6 or Claim 7. The resin-coated air according to any one of claims 6 to 8, wherein the thermal shrinkage stabilization process is performed by performing the thermal stabilization process in a plurality of steps in a range from room temperature to 220 ° C. A method for manufacturing a base fabric for a bag.

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