JP3932049B2 - Manufacturing method of fabric for airbag - Google Patents

Description

  An object of the present invention is to provide an airbag fabric that is one of automobile safety devices having low air permeability while maintaining necessary mechanical characteristics, and an efficient manufacturing method thereof.

  In recent years, airbags, which have been rapidly installed as one of the safety parts of automobiles, detect high-pressure, high-pressure gas from the inflator when a car crash occurs. The airbag is suddenly deployed to prevent and protect the body of the driver or passenger, particularly the head, from colliding with the handle, windshield, door glass or the like. Conventionally, cloths suitable for the intended use have been used for these purposes, such as non-coated cloth without coating and coated cloth with coating.

  However, since the non-coated cloth has a high air permeability, there is a problem that the applicable range is limited. Coated cloth has a low air permeability and is suitable as an air bag. However, since the base cloth is heavy, inflexible, and expensive to manufacture, it is used within the range where low air permeability is required. Limited.

An invention of an airbag in which an elastomer resin is unevenly distributed in a mesh portion of a woven fabric is known (for example, see Patent Document 1). However, in the above production method, a coating amount of 20 g / m ² or less is achieved by diluting and coating a silicone resin in a solvent.
JP-A-6-8779

On the other hand, a method for producing a fabric for an airbag in which an aqueous emulsion of a silicone resin is adhered in a range of 0.1 to 10 g / m ² is known (for example, see Patent Document 2). According to the manufacturing method, a woven fabric having characteristics such as light weight and flexibility is obtained.
JP-A-5-16753

An airbag fabric having a resin layer in which the cover factor, single yarn fineness, coating amount, thickness, air permeability and the like are described is also known (for example, see Patent Document 3). The airbag fabric has characteristics such as light weight and thinness, but only a very high air permeability level is obtained as compared with a general coated fabric.
JP 2001-89949 A

An industrial fabric using an aqueous silicone emulsion containing an organosiloxane and a method for producing the same are also known (see Patent Documents 4 and 5). The above is characterized in that the dough is applied and processed in an unprocessed state.
JP 2000-225666 A JP 2001-288461 A

In addition to the above, a method of processing into a fabric using an aqueous emulsion resin is known (for example, see Patent Document 6). According to the said method, although there exists description regarding carrying out simultaneously with a washing | cleaning and a drying process as a process, it is not going to obtain a lower air permeability.
JP-A-9-124947

The present invention provides a method for producing a resin-processed woven fabric suitable for an air bag having a low air permeability that is not obtained at a level that can be applied between normal fibers and that is lightweight and cannot be solved by the conventional method described above. intended to challenge, it is intended to provide a method for efficiently producing airbag fabric of order to obtain a low air permeability under high pressure as a differential pressure 100 kPa.

That is, the present invention has the following configuration.
1. An aqueous emulsion of resin is applied to a textile base fabric having a residual shrinkage of 0.5% or more measured under conditions of 150 ° C. × 30 min, and 1% or more and 10% or less in the warp direction and / or the weft direction. A method for producing a fabric for an airbag in which a film of a resin is formed by stretching, applying tension, and heating, wherein a cover factor of the airbag fabric is 2000 to 2500, and the heating is at least 100. A method for producing a fabric for an air bag, characterized in that a chamber having a set temperature of not higher than ° C. and a chamber having a set temperature of not less than 140 ° C. are sequentially passed.
2. 2. The method for producing a woven fabric for an air bag according to the first aspect, wherein the woven fabric is a woven fabric woven in a water jet loom using a yarn having a boiling water shrinkage of 6 to 15%.

According to the present invention, while maintaining the required mechanical properties as a base fabric for an air bag, a manufacturing method capable of obtaining a product woven airbag efficient with low air permeability at high pressure difference pressure at a low cost Can be provided.

Here, the characteristics of the base fabric suitable for the airbag manufacturing method of the present invention will be described in detail. The synthetic fiber to be used is not particularly limited, but in particular, aliphatic polyamide fibers such as nylon 66, nylon 6, nylon 46 and nylon 12, aromatic polyamide fibers such as aramid fiber, polyethylene terephthalate and polybutylene. Polyester fibers such as terephthalate are used. The fibers are preferably used in the form of multifilament yarns because they facilitate the weaving of a high-density fabric and increase the tensile strength and tear strength. Examples of other fibers include wholly aromatic polyester fibers, ultrahigh molecular weight polyethylene fibers, polyphenylene sulfide fibers, and polyether ketone fibers. In view of economy, polyester fiber and polyamide fiber are particularly preferable, and polyamide fiber is preferable in view of the resistance to melting by high-temperature gas when the airbag is deployed. These fibers may be obtained from raw materials partially or wholly reused. There is no problem even if these synthetic fibers contain various additives in order to improve process passability in the raw yarn manufacturing process and the post-processing process. For example, antioxidants, heat stabilizers, smoothing agents, antistatic agents, thickeners, flame retardants and the like. Moreover, even if this synthetic fiber yarn is a colored yarn, there is no problem.

Cover factor is an important indicator when weaving with synthetic fiber yarns. If the cover factor is low, the physical properties (tensile strength and tear strength) required for the airbag are low, which is not preferable. Also, the cover factor has a great influence on the air permeability. A larger cover factor is preferable because the air permeability is lowered, but there are limitations due to weaving and storage. Preferably, the cover factor after resin processing is 2000 to 2500, more preferably 2150 to 2450, and still more preferably 2300 to 2450. The cover factor described in the present invention was determined as follows.
Cover factor = (warp fineness [dtex]) ^1/2 × (warp density [lines / 2.54cm])
+ (Weft fineness [dtex]) ^1/2 × (weft density [line / 2.54cm]) (Equation 1)

  Moreover, it is preferable that the coverage by the below-mentioned measuring method is 10% or more. This cover rate is intended for a woven fabric after resin processing, and means that the cover rate in at least one of the warp cross-sectional direction and the weft cross-sectional direction is 10% or more. When the cover ratio is 10% or more, the effect of reducing the air permeability by resin processing is effectively imparted. In the warp cross-sectional direction and the weft cross-sectional direction, it is more preferable that the cover ratio in the warp cross-sectional direction is high because it is easy to impart an air permeability reduction effect empirically, but both directions may be 10% or more. Particularly preferably, the bar ratio is 14% or more in the warp section direction, and more preferably, the cover ratio is 25% or more in the warp section direction. However, if we try to make a woven fabric with an excessively large coverage, it will be extremely dense during weaving, so the weaving machine operation rate will decrease, and too much shrinkage will occur during the scouring process, resulting in frequent wrinkle defects. Since processing defects increase, it is preferably 40% or less, and more preferably 37% or less.

As a method for applying the resin, a conventionally known application method is used. That is, knife coating, comma coating, die coating, gravure roll coating, kiss roll coating, spray method, Dip method, and the like can be mentioned, but are not limited thereto. It is preferable that 5 to 25 g / m ^{2 is} given as the adhesion amount of the resin, and more preferably 11 to 20 g / m ² . If it is less than 5 g / m ² , the formation of the film is not sufficient, and it is difficult to obtain a low air permeability. When the amount is more than 25 g / m ^2, it is preferable that the air permeability is low, but it is not preferable because the basis weight of the base fabric is increased and the storage property is lowered. Preferably it is 20 g / m ² or less. Further, these resins are preferably present between the single yarn fibers on the front and back surfaces of the fabric. By the presence of the resin between the single yarn fibers, the air permeability reduction effect can be obtained with a smaller resin application amount than when the resin layer is present on the base fabric surface layer. Moreover, it is preferable to make resin exist between the single yarn fiber of both the surface of this textile fabric, and a back surface. The presence of the resin on both sides further reduces the air permeability. As a method for causing the resin to exist on both sides, the above-described coating method can be performed twice on the front side and the back side, but coating on one side (surface) once is preferable because the process can be shortened. If the viscosity is adjusted by gravure roll coating, kiss roll coating, spray method, or Dip method, a substantially double-sided coating in which a resin is present between single-sided fibers on both sides can be made relatively easily. Furthermore, by adjusting the viscosity of the agent, the resin can be present between the single yarn fibers on both sides with a single coat even with a knife coat, comma coat or die coat. The viscosity of these agents is preferably in the range of 200 cps to 5000 cps. The coating method and the viscosity of the agent may be selected in consideration of adverse effects on the process caused by the back-through of the base fabric during application and the effect of reducing the air permeability.

The amount of resin applied to the woven fabric can be determined by calculation from the woven fabric before applying the resin and the fabric weight after applying the resin. That is, the fabric basis weight before resin application is subtracted from the fabric basis weight after resin application, and the difference is expressed in resin amount (g / m ² ). However, if there is only the woven fabric after resin application, and there is no woven fabric before resin application, from the woven fabric after resin application, it is dissolved with a solvent that dissolves only the woven fabric or the applied resin, and the residue application resin The amount of resin can also be estimated roughly from the weight or the weight of the residual fabric. In the measurement by the dissolution method, it is a condition that only the woven fabric or the coat resin is dissolved, and the weight of the surfactant added to the emulsion or the like is more accurate in consideration. Another method is to derive the thickness and number of filaments that make up the fabric from the cross-section of the fabric, and calculate from the yarn density (specific gravity), crimp rate, and fabric density obtained by the density gradient tube method before applying the resin. It is also possible to calculate the basis weight of the fabric and subtract it from the fabric basis weight after application of the resin to estimate it roughly.

  When a resin is applied to the woven fabric, the applied resin is often unevenly distributed at the intersection of warp and weft. It is sufficient for the unevenly distributed resin to form a layer as an effect of reducing the air permeability, and it is preferable that the resin is less if it is less. If the resin does not adhere between the single fibers of the fabric against the amount of resin attached, it will not only contribute to the effect of reducing the air permeability despite the fact that many resins are used, but it will also lead to an increase in the weight of the fabric and storage capacity. Adverse effects on Thinning the single yarn fineness is preferable because it has the effect of reducing the amount of adhesion without being unevenly distributed. This is because the gap between the warp and weft single yarn fibers can be reduced.

Airbag fabrics that require pressure retention after deployment of the air bag may have increased air permeability due to membrane breakage, peeling of the adhesive surface between the single yarn and the resin, etc. when a high pressure load is applied. It is not preferable to have it. Therefore, evaluation of the air permeability with a large differential pressure at about 100 kPa is preferable. The woven fabric of the present invention preferably has an air permeability of 1 × 10 ^{−3 to} 5.0 × 10 ⁻¹ L / cm ² / min when a pressure of 100 kPa is applied to the woven fabric. When the air permeability is higher than 5.0 × 10 ⁻¹ L / cm ² / min, it is difficult to use as a cloth having the same performance as the coated cloth, and the difference from the non-coated cloth becomes small, which is not preferable. Preferably it is 1.0 * 10 < ^-1 > L / cm < ² > / min or less, More preferably, it is 5.0 * 10 ^<-2 > L / cm ^{< 2} > / min or less. If the air permeability is to be smaller than 1 × 10 ⁻³ L / cm ² / min, it is necessary to increase the amount of resin to be applied, and the storage property is not good.

  The single yarn fineness constituting the woven fabric is preferably 6 dtex or less. Exceeding 6 dtex is not preferable because the flexibility of the fabric is impaired. More preferably, it is 5 dtex or less, More preferably, it is 3 dtex or less. By reducing the single yarn fineness, the distance between the single yarn fibers can be reduced, and the air permeability can be lowered with the same cover factor. Further, if the single yarn freshness is reduced, the fiber surface area can be increased, and the interface fracture of the resin under a high differential pressure can be suppressed.

  The total fineness of the raw yarn used is preferably 100 to 600 dtex. More preferably, the total fineness is 140 to 470 dtex. If the total fineness is less than 100 dtex, the tensile strength and tear strength required for an airbag may be insufficient, which is not preferable. If it exceeds 600 dtex, there is no problem with the strength, but the flexibility of the fabric is impaired and the storage property is deteriorated.

  The thickness of the woven fabric is preferably 0.32 mm or less. The thinner the airbag, the better the storage and the better. Preferably it is 0.30 mm or less, More preferably, it is 0.29 mm or less.

  The residual shrinkage of the base fabric before processing is preferably 0.5% or more in at least one of the weft directions. In the present invention, the base fabric is stretched before the resin film is formed to reduce the distance between the single yarn fibers, and the distance between the single fibers is reduced by the residual shrinkage. A low air permeability could be obtained under pressure. It is preferable that the residual shrinkage is 0.5% or more in the warp or weft direction because an air permeability reduction effect can be easily obtained. More preferably, it is at least 1.0% in any one direction of the warp or weft direction, more preferably at least 1.5% in any one direction of the warp or weft direction. It can be said that this residual shrinkage is one of the ideas for increasing the coverage of the processed fabric. The residual shrinkage rate is preferably 8% or less. If it exceeds 8%, the amount of movement between the fibers due to shrinkage of the fibers during processing is large, and the formation of the film may be impaired. The residual shrinkage rate was measured using JIS L 1909, and the shrinkage side was indicated as plus.

  In order to obtain low air permeability, a method of applying resin processing to the base fabric is generally known. As resins used for such resin processing, elastomer resins such as polyurethane, polyester, polyamide, acrylic, silicone, polyethylene, styrene butadiene, and nitrile butadiene are known, and predetermined performance is obtained. Any resin can be used as long as it is possible. In consideration of the adhesive strength to the base fabric, the elongation of the agent, etc., polyurethane, acrylic and silicone are preferable, and silicone is particularly preferable from the viewpoint of flexibility of the base fabric.

  As the coating agent, it is preferable to use an aqueous emulsion of the resin as described above. Use of an aqueous emulsion is preferred because the resin tends to be present between the single yarn fibers on both sides of the fabric. However, if the viscosity is adjusted, a solvent system or a solventless system may be used. In consideration of the influence on the environment, solvent-free and aqueous emulsions are preferably used. There is no restriction | limiting in particular as an aqueous emulsion to be used, The aqueous emulsion containing a conventionally well-known addition polymerization type polyorganosiloxane is excellent. The viscosity of the agent is preferably 200 cps to 5000 cps. More preferably, it is 300-1000 cps. Moreover, the adhesion promoter which improves adhesiveness with a textile material can be mix | blended suitably.

  As a method for drying and curing the coating agent after application, a commonly used heating method such as hot air, infrared light, microwave, or the like is used. In order to avoid the formation of bubbles, the preset temperature of the first chamber is preferably 100 ° C. or lower, more preferably 80 to 100 ° C., and still more preferably preliminary drying at 90 to 100 ° C. In the second chamber, the resin is cured (stablely fixed) at 140 to 220 ° C., preferably 150 to 200 ° C., more preferably 160 to 190 ° C. If the applied resin has reached a temperature sufficient for curing, it may be further subdivided instead of the two regions. Since the time for curing depends on the coating weight and conductivity on the coated material, it can be appropriately determined, but preferably 0.5 to 30 minutes, more preferably 0.75 to 10 minutes, Preferably it is 1-5 minutes.

  It is preferable to cause shrinkage of the yarn in the fabric while the fabric is constrained or stretched while passing through the drying and curing chambers. Residual shrinkage of the fabric before processing appears as shrinkage due to heat, and the resin film that reduces the air permeability is reduced because the gap between the single yarn fibers is reduced and at the same time the resin existing between the single yarn fibers is cured. Single yarn fibers can be tied together efficiently. In addition, it is preferable that the air permeability can be further lowered by applying a tension during processing to reduce the distance between the single yarn fibers. It is preferable to contract while fixing at least the end of the fabric. The method for transporting the fabric in the preliminary drying and curing furnace is not particularly limited. A known technique such as a generally known tenter method is applied. In order to reduce the distance between the single yarn fibers, it is preferable to maintain the tension during processing. The warp tension applied during processing is preferably generated by extending 1% or more in the warp direction and / or the weft direction, and at least one of the feed speed and the take-up speed can be changed. It can be expressed by the difference in speed using the apparatus, and the speed difference ratio (%) becomes the elongation rate. Stretching in the weft direction can be applied by moving a necessary amount in the weft direction after gripping using an apparatus that can change the width after gripping the end of the fabric. The elongation percentage is preferably 2% or more, and more preferably 3% or more. However, if the stretch rate is too large, the applied resin may be cracked and the air permeability may be increased. Therefore, it is preferably 10% or less, and more preferably 8% or less. It can be said that generating tension at the above-described elongation rate is one of the effects of improving the coverage rate.

  The boiling water shrinkage of the thermoplastic fiber yarn used in the present invention is preferably 6 to 15%. If the boiling water shrinkage is less than 6%, it is difficult to obtain the necessary residual shrinkage of the base fabric, which is not preferable. Preferably it is 6% or more, More preferably, it is 8% or more. However, if the boiling water shrinkage rate is larger than 15%, the thickness of the woven fabric after shrinkage becomes thick, which is not preferable because the storage property is poor. The boiling water shrinkage is more preferably 7 to 13%. The fabric used for resin processing in the present invention may or may not be subjected to scouring and setting treatment before resin processing. When scouring, setting treatment, or heat treatment is performed before resin processing, it is not particularly specified, and is usually carried out at 60 to 200 ° C. Preferably, the treatment at 160 ° C. or lower is preferable for obtaining low air permeability. The treatment is not particularly limited, such as a heat setter or a boiling water bath, but a processing machine capable of about 2 to 15% overfeed in the warp and weft directions may be used to keep the residual shrinkage in a predetermined range. Moreover, performing the resin processing without performing the above treatment produces a better effect. The boiling water shrinkage is measured according to JIS L-1096.

  The weaving method is not particularly limited, and the loom is not particularly limited, such as an air jet room, a rapier room, a water jet room or the like, but a water jet room is particularly preferable. Use of a water jet loom is preferable because an oil agent or the like contained in the fiber is washed and can be used as a coating cloth without performing a scouring step.

  Next, the present invention will be described in more detail with reference to examples. Various evaluations in the examples were performed according to the following methods.

Total fineness: Measured by the method described in JIS L-1095 9.4.1.
Number of filaments: The number of filaments was counted from a cross-sectional photograph of the fiber yarn.
Boiling water shrinkage: measured by the method described in JIS L-1095 9.24.
Fabric density: Measured by the method described in JIS L 1096 8.6.1.
Thickness: Measured by the method described in JIS L-1096.
Crimp rate: Measured by the method described in JIS L-1096.
Residual shrinkage ratio: Prepare a sample with a grade added by the method described in JIS L-1096 8.64.4,
150 ° C for 30 minutes, put in an oven without applying tension, and return to room temperature
The interval between the evaluation lines was measured. The measured value uses the method described in JIS L-1909.
The contracted side was positive.
Viscosity of the agent: Measured with a B-type viscometer using the method described in JIS K-7117.
Air permeability: Air permeability under a differential pressure of 100kPa High pressure air permeability measuring machine (OEM System Co., Ltd.)
It measured using.
Covering rate: Take a cross-sectional SEM photograph of the fabric, measure the length corresponding to a and b in FIG.
Cover rate (%) = {(ab) / a} × 100 (Equation 2)
In Table 1, when the value of a−b is negative, the coverage is represented by “−”.

Example 1
After weaving nylon 66 yarn with a total fineness of 470 dtex, 144 filaments, strength = 8.4 cN / dtex, boiling water shrinkage rate = 9.3% in a plain weave in a water jet loom, shrinking with warm water of 95 ° C, then at 130 ° C A plain woven fabric having physical properties before drying as shown in Table 1 was obtained. A water-based silicone emulsion having the following composition A was used for this woven fabric, and after the impregnation treatment, squeezed with a mangle composed of a rubber roll, and processing was carried out at the processing temperature, processing time, and elongation at processing shown in Table 1. Table 1 shows the density, air permeability, and coverage of the fabric after processing. The amount of resin provided was obtained by subtracting the weight of the base fabric before processing from the weight of the fabric after processing. A sample for measurement was cut out of 20 cm × 20 cm, its weight was measured, and the resin amount (g / m ² ) was determined by multiplying the difference in weight by 25 times. In this processing, an apparatus having a first chamber and a second chamber, which can change the feeding speed and the winding speed of the fabric, can hold and fix both the weft ends, and can change the temperature, was used. The stretch rate in the warp direction was set by the ratio between the feed speed and the take-up speed. The stretch rate in the weft direction = 0% indicates that the workpiece is gripped and processed. From the SEM cross section where the coverage was measured, it was confirmed that the resin was present between the single yarn fibers located on the front and back surfaces of the fabric.
Formulation A
(1) Dehesive 457 83 parts (2) Crosslinker V72 12 parts (3) Silane HF86 5 parts The combination drug is manufactured by Wacker Silicone (Germany). Compound A (1) is itself an aqueous emulsion product having a solid content of 50% by weight, and is combined with (2) to form an addition polymerization type silicone rubber aqueous emulsion. (3) is a silane coupling agent for improving adhesiveness. The viscosity of Formulation A was 380 cps when measured with a B-type viscometer.

(Example 2)
A plain weave was woven in the water jet loom using the same yarn as in Example 1, and then contracted with warm water at 95 ° C. and dried at 130 ° C. to obtain a plain weave having physical properties before coating as shown in Table 1. A water-based silicone emulsion having the composition A of Example 1 was used for this woven fabric, and after the impregnation treatment, squeezed with a mangle composed of a rubber roll, and processing was performed at the processing temperature, processing time, and elongation at processing shown in Table 1. Table 1 shows the density, cover factor, air permeability, and coverage after processing. The amount of resin applied was determined in the same manner as in Example 1. In this processing, an apparatus having a first chamber and a second chamber, which can change the feeding speed and the winding speed of the fabric, can hold and fix both the weft ends, and can change the temperature, was used. The stretch rate in the warp direction was set by the ratio between the feed speed and the take-up speed. The stretch rate in the weft direction = 0% indicates that the workpiece is gripped and processed. From the SEM cross section where the coverage was measured, it was confirmed that the resin was present between the single yarn fibers located on the front and back surfaces of the fabric.

(Examples 3 to 4)
A plain weave was woven in the water jet loom using the same yarn as in Example 1, and then contracted with warm water at 95 ° C. and dried at 130 ° C. to obtain a plain weave having physical properties before coating as shown in Table 1. A water-based silicone emulsion having the composition A of Example 1 was used for this woven fabric, and after the impregnation treatment, squeezed with a mangle composed of a rubber roll, and processing was performed at the processing temperature, processing time, and elongation at processing shown in Table 1. Table 1 shows the density, cover factor, air permeability, and coverage after processing. The amount of resin applied was determined in the same manner as in Example 1. In this processing, an apparatus having a first chamber and a second chamber, which can change the feeding speed and the winding speed of the fabric, can hold and fix both the weft ends, and can change the temperature, was used. The stretch rate in the warp direction was set by the ratio between the feed speed and the take-up speed. The stretch rate in the weft direction = 0% indicates that the workpiece is gripped and processed. From the SEM cross section where the coverage was measured, it was confirmed that the resin was present between the single yarn fibers located on the front and back surfaces of the fabric.

(Examples 5-6)
After weaving plain weave in a water jet loom using nylon 66 yarn with a total fineness of 350 dtex, 144 filaments, strength = 8.4 cN / dtex, boiling water shrinkage rate = 9.5%, shrinking with warm water of 95 ° C, and 130 ° C A plain woven fabric having physical properties before drying as shown in Table 1 was obtained. Using the water-based silicone emulsion having the formulation A of Example 1 for this woven fabric, the woven fabric of 50 cm × 50 cm was squeezed with a mangle composed of a rubber roll after impregnation treatment, and the background is shown in Table 1 with a length (Table 1) %) Was stretched, a 50 cm × 50 cm woven fabric was fixed, the temperature of the processing furnace having the first chamber and the second chamber was adjusted, and processing was performed at the processing temperature, processing time, and elongation rate during processing shown in Table 1. . Table 1 shows the density, cover factor, air permeability, and coverage after processing. The amount of resin applied was determined in the same manner as in Example 1. From the SEM cross section where the coverage was measured, it was confirmed that the resin was present between the single yarn fibers located on the front and back surfaces of the fabric.

(Example 7)
Weaving in a water jet loom with plain weave using nylon 66 yarn with a total fineness of 350 dtex, 72 filaments, strength = 8.4 cN / dtex, boiling water shrinkage rate = 9.4%, shrinking with warm water of 95 ° C, 130 ° C A plain woven fabric having physical properties before coating as shown in Table 1 was obtained. An aqueous silicone emulsion having the formulation A of Example 1 was used for this woven fabric, and a woven cover ratio of 50 cm × 50 cm was measured. After impregnating the article, it is squeezed with a mangle composed of a rubber roll, and the background is stretched (%) in the length (%) shown in Table 1 to fix the background, and a 50 cm × 50 cm woven fabric is fixed. The temperature of the processing machine having the chamber was adjusted, and processing was performed at the processing temperature, processing time, and processing elongation rate shown in Table 1. Table 1 shows the density, cover factor, air permeability, and coverage after processing. The amount of the coating agent was determined in the same manner as in Example 1.
From the SEM cross section where the coverage was measured, it was confirmed that the resin was present between the single yarn fibers located on the front and back surfaces of the fabric.

  Table 1 shows that the work cloth of each Example of this invention is excellent in the low air permeability performance in 100 kPa differential pressure | voltage.

(Comparative Example 1)
A plain weave was woven in a water jet loom using the same yarn as in Example 1, and then contracted with warm water at 95 ° C., and then dried at 130 ° C. to obtain a plain weave having physical properties before coating as shown in Table 2. A water-based silicone emulsion having the formulation A of Example 1 was used for this woven fabric, and after the impregnation treatment, squeezed with a mangle composed of a rubber roll, and processing was performed at the processing temperature, processing time, and elongation at processing shown in Table 2. Table 2 shows the density, cover factor, air permeability, and coverage after processing. The amount of the coating agent was determined in the same manner as in Example 1. In this processing, an apparatus having a first chamber and a second chamber in which the weft feeding speed and the winding speed are the same speed, both weft ends can be held and fixed, and the temperature can be changed was used. The device was used without gripping both the weft ends. From the SEM cross section where the coverage was measured, it was confirmed that the resin was present between the single yarn fibers located on the front and back surfaces of the fabric.

(Comparative Examples 2-3)
A plain weave was woven in a water jet loom using the same yarn as in Example 1, and then contracted with warm water at 95 ° C., and then dried at 130 ° C. to obtain a plain weave having physical properties before coating as shown in Table 2. A water-based silicone emulsion having the formulation A of Example 1 was used for this woven fabric, and after the impregnation treatment, squeezed with a mangle composed of a rubber roll, and processing was performed at the processing temperature, processing time, and elongation at processing shown in Table 2. Table 2 shows the density, cover factor, air permeability, and coverage after processing. The amount of the coating agent was determined in the same manner as in Example 1. In this processing, an apparatus having a first chamber and a second chamber, which can change the feeding speed and the winding speed of the fabric, can hold and fix both the weft ends, and can change the temperature, was used. The stretch rate in the warp direction was set by the ratio between the feed speed and the take-up speed. The stretch rate in the weft direction = 0% indicates that the workpiece is gripped and processed. From the SEM cross section where the coverage was measured, it was confirmed that the resin was present between the single yarn fibers located on the front and back surfaces of the fabric.

(Comparative Example 4)
A plain weave was woven in a water jet loom using the same yarn as in Example 1, and then contracted with warm water at 95 ° C., and then dried at 130 ° C. to obtain a plain weave having physical properties before coating as shown in Table 2. A water-based silicone emulsion having the formulation A of Example 1 was used for this woven fabric, and after impregnation, the fabric was squeezed with a mangle composed of an embossing roll and a rubber roll, and processing was performed at the processing temperature, processing time, and elongation at processing shown in Table 2. . Table 2 shows the density, cover factor, air permeability, and coverage after processing. The amount of the coating agent was determined in the same manner as in Example 1. In this processing, an apparatus having a first chamber and a second chamber, which can change the feeding speed and the winding speed of the fabric, can hold and fix both the weft ends, and can change the temperature, was used. The stretch rate in the warp direction was set by changing the feed speed and take-up speed of the fabric, and the apparatus was used without gripping both weft ends. From the SEM cross section where the coverage was measured, it was confirmed that the resin was present between the single yarn fibers located on the front and back surfaces of the fabric.

(Comparative Example 5)
A plain weave was woven in the water jet loom using the same yarn as in Example 7, and after shrinkage processing with warm water at 95 ° C., it was dried at 130 ° C. to obtain a plain weave having physical properties before coating as shown in Table 1. A water-based silicone emulsion having the composition A of Example 1 was used for this woven fabric. After impregnation, the fabric was squeezed with a mangle composed of a rubber roll. After being impregnated, the fabric was squeezed with a mangle composed of a rubber roll. The length (%) described in Table 1 is stretched in a frame that can be fixed, a 50 cm × 50 cm woven fabric is fixed, the temperature of the processing machine having the first chamber and the second chamber is adjusted, Processing was performed at the processing time and the elongation rate during processing. Table 1 shows the density, cover factor, air permeability, and coverage after processing. The amount of the coating agent was determined in the same manner as in Example 1. From the SEM cross section where the coverage was measured, it was confirmed that the resin was present between the single yarn fibers located on the front and back surfaces of the fabric.

The airbag fabric obtained by the present invention can be suitably used for an airbag whose wearing rate is rapidly improved as one of automobile safety parts. Even at a high differential pressure of 100 kPa, a low air permeability is obtained, and it is thin and excellent in storage property. In addition, the method for producing an airbag fabric of the present invention provides an airbag fabric as described above by applying an aqueous emulsion solution of resin, applying tension, and drying and curing under a specific chamber temperature condition. The manufacturing method which can be manufactured efficiently can be provided.

It is a schematic diagram of the cross-sectional SEM photograph of the textile fabric for airbags for calculating a cover rate.

Claims (2)

  An aqueous emulsion of resin is applied to a textile base fabric having a residual shrinkage of 0.5% or more measured under conditions of 150 ° C. × 30 min, and stretched by 1% or more and 10% or less in the warp direction and / or the weft direction. A method for producing a fabric for an airbag in which a resin film is formed by applying tension and heating, wherein the airbag fabric has a cover factor of 2000 to 2500, and the heating is at least 100 ° C. or less. A method for producing a fabric for an airbag, wherein a chamber having a preset temperature and a chamber having a preset temperature of 140 ° C. or higher are sequentially passed. The method for producing a fabric for an airbag according to claim 1, wherein the fabric base fabric is a fabric woven by a water jet loom using yarns having a boiling water shrinkage of 6 to 15%.

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