KR20090131556A - A side curtain typed airbag, method of preparing the same, and airbag system including it - Google Patents

Abstract

PURPOSE: A side curtain type airbag, a manufacturing method thereof, and an air back system including the same are provided, which obtain high internal pressure bearing ratio and protect passengers safely in vehicle rollover. CONSTITUTION: A side curtain type airbag comprises inflatable parts(4a,4b), a non-inflatable part, and a junction. The inflatable part has inflatability by gas. The non-inflatable part supports the inflatable part. The junction forms the boundary of the non-inflatable part and inflatable part. A seam sealant is spread on the joint surface of the junction. When an airbag is aged at 38~42 deg.C and relative humidity 93~97 %RH for more than 408 hours, the maximum pressure is 40 kPa or greater in the early expansion of the airbag and the holding pressure of the airbag after 6 seconds is 25 kPa or greater.

Description

Side curtain type airbag, manufacturing method thereof, and airbag system including same {A SIDE CURTAIN TYPED AIRBAG, METHOD OF PREPARING THE SAME, AND AIRBAG SYSTEM INCLUDING IT}

The present invention relates to a side curtain airbag that prevents occupants from being injured by vehicle side windows or structures when the vehicle is overturned, a method of manufacturing the same, and an airbag system including the same.

Generally, an air bag detects a collision shock applied to a vehicle at a speed of about 40 km / h or more at a speed of about 40 km / h, and then explodes a gunpowder to expel gas into the airbag cushion. By supplying and expanding, it refers to a device that protects the driver and passengers.

The side curtain type airbag refers to an airbag installed in the vehicle side windshield or side structure to prevent the occupant from colliding with the vehicle side windshield or the structure when the vehicle is overturned.

Conventional airbags installed in front of the car must be inflated quickly by explosive gas in the event of a car crash and then discharged in the airbag within a short time, minimizing the secondary impact of the occupants by the airbag and The visibility was also secured. To this end, most of the conventional airbags installed on the front of the vehicle are provided with holes for discharging air.

However, since the side curtain type airbag protects the passenger's head from the side windshield or side structure of the vehicle when the vehicle rolls over or rolls, the side curtain type airbag continues to inflate for at least 6 seconds when the vehicle is rolled over. Your head should be given safely. To this end, gas should not leak more than necessary from the sewing portion and the fabric of the airbag. Therefore, in general, air vent holes are not formed in the side curtain type airbags.

In addition, in the air curtain of the side curtain type, it is necessary to suppress the excessive discharge of the gas in the airbag to the sewing portion. To this end, U.S. Patent No. 5,685,347 proposes a method of fabricating OPW (One Piece Woven) form by simultaneously weaving the upper and lower surfaces of the airbag on a jacquard loom. However, this method requires a jacquard loom with expensive electronic equipment attached thereto, and a pattern input for weaving preparation is very difficult. In addition, the method also has a problem that the peripheral portion can not be used as a fabric for the air bag if a defect occurs even once weaving.

In addition, Japanese Laid-Open Patent Publication Nos. 1992-081342, 1992-197848, 1991-010946, etc., sewn rubber-coated fabrics to manufacture airbags, and then discharge the gas in the airbags into the gaps between the sewing portions. In order to prevent this from happening, a sealing process for sealing the sewing part with a tape or the like is proposed. However, the method has a problem that the process is complicated and the manufacturing cost is increased because a separate sealing process is added.

Therefore, it develops a side curtain type airbag that has excellent pressure-resistance performance that can protect the occupants safely in case of an accident such as vehicle overturning, and can be manufactured at a low cost and efficient process through a more common weaving process, cutting, and sewing process. There is a need for research. In particular, the airbag mounted on the car is kept in a very closed space until it is actually deployed, and the existing side curtain type airbags are limited in maintaining sufficient deployment performance under severe humidity conditions. It has been.

The present invention seeks to provide a side curtain airbag and airbag system comprising the same, which maintains sufficient performance under severe conditions of high humidity.

In addition, the present invention is to provide a method for producing a side curtain airbag having excellent pressure resistance performance.

The present invention includes an expansion part having a part property by gas, a non-expansion part for supporting the expansion part, and a joint part forming a boundary between the expansion part and the non-expansion part, and a sealant is applied and sewn to the joint surface of the joint part. After aging for at least 408 hours at a temperature of 38 to 42 ° C. and a relative humidity of 93 to 97% RH, when an instantaneous pressure of 20 to 25 bar is injected into the airbag, the maximum pressure at initial airbag inflation is at least 40 kPa, 6 seconds Provided is a side curtain airbag in which the subsequent holding pressure is 25 kPa or more.

In addition, the present invention is the step of weaving the dough for plain weave air bag using the fabric for airbag fabric, refining the dough for woven airbag, the step of tentering the refined fabric, the tentered fabric airbag shape It provides a method of manufacturing a side curtain airbag, including the step of cutting, and sewing after applying the heat sealant to the bonding surface of the airbag.

The present invention also provides an airbag system comprising the airbag.

Hereinafter, the present invention will be described in more detail.

The present invention provides excellent air bag deployment even after aging under harsh conditions of high humidity by optimizing the method of applying and sewing the sealant at the joint between the inflated part and the non-inflated part and optimizing the refining and tentering process in the manufacture of the side curtain type airbag. It is possible to improve air leakage prevention and airtightness and to improve the bark strength of the joint to achieve the development performance.

In addition, the present invention describes a detailed description based on a side curtain type air bag, but is not limited to a driver's seat airbag (air bag), a passenger seat airbag, a side airbag, a knee airbag (knee air) bag and air bag for pedestrian protection.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention.

1 is a plan view of a side curtain type air bag of the present invention, and FIG. 2 is a cross-sectional view of the junction 2 of the air bag of FIG.

As shown in Fig. 1, the side curtain type airbag 1 of the present invention includes a non-expansion portion that is an outer circumference and an inflation portion that is an interior portion, and the inflation portions 4a and 4b made of two pieces of fabric are joined by a joining portion 2. That is, as shown in FIG. 2, in the joining part 2, the upper end fabric 4a and the lower fabric 4b of the expansion part are joined using the sealant 3, and are sealed by the sewing thread 5. As shown in FIG.

In the present invention, the junction refers to a portion that forms a boundary between an inflated part having a component part by a gas and a non-expanded part supporting the inflated part in the airbag for a vehicle, and the joined part is a gas that generates a part when the airbag is deployed. It does not escape from the expansion portion, and serves to withstand the pressure of the expanding gas. The present invention is characterized in that the sealant 5 is applied to the side curtain type airbag at the same time as using the sealant 3 as shown in FIG. 2.

First, the fabric for the side curtain type airbag of the present invention is usually used a fabric formed through weaving. The fabric may be a fabric including at least one selected from the group consisting of nylon-based fabrics, polyester-based fabrics, aramid-based fabrics. The type of the fabric used in the present invention is also not particularly limited, but excellent tensile strength retention and heat resistance when left for a long time in the low breathability, high strength, high heat resistance, folding properties and high temperature-high humidity, which is required as an airbag fabric Considering the aging properties and the excellent self-extinguishing and the energy absorption, which prevent secondary damage during airbag deployment, nylon 66 fabric is preferred. In addition, the fabric may include a heat improver, an antioxidant, a flame retardant, an antistatic agent, and the like, as necessary.

As the fiber used in the fabric for the side curtain type airbag, one or more selected from the group consisting of nylon yarn, polyester yarn, polyolefin yarn, and aramid yarn may be used. The fabric fiber for the air bag has a fineness of 210 to 840 denier, preferably 315 to 525 denier, filament number of 60 to 200, preferably 60 to 150, tensile strength of 7.0 to 10.0 g / d, preferably Is 8.2 to 9.5 g / d, the heat shrinkage may be used 6-6% level, and is not particularly limited.

The side curtain type airbag of the present invention does not use an OPW (One Piece Woven) type fabric using a jacquard loom having a complicated structure in the weaving stage, and a general rapier loom or air jet loom ( Using plain weave fabrics, such as air jet looms or water jet looms, can simplify the process and reduce manufacturing costs.

In addition, the present invention may be coated with a rubber component on one side or both sides of the airbag fabric to lower the air permeability. The rubber component used in the coating may be a material commonly used for fiber coating, and it is preferable to include powder type silicone, liquid type silicone, or a mixture thereof in terms of airtightness and strength at development. desirable.

The coating of the rubber component is to effectively improve the tear strength of the fabric for airbags and to effectively block air permeation to the surface of the plain weave fabric, and at the same time, as shown in FIG. It is to improve confidentiality. Coating of the rubber component is carried out over the entire fabric surface. As a coating method, a conventional coating method can be performed by a knife coating method, a doctor blade method, a spray coating method, and the like, and preferably, a knife coating method is used.

At this time, the preferred coating amount of the rubber component is 20 to 100 g / ㎡ per unit area, preferably 25 to 60 g / ㎡. If the coating amount is less than 20 g / ㎡, the air bag has a lot of air flow and cannot be inflated for more than 6 seconds at a constant pressure after deployment. If the coating amount exceeds 100 g / ㎡, the airbag becomes too thick and the storage capacity becomes worse. Not desirable

In addition, the present invention is a sealant (Seam Sealant) to the airbag fabric surface, that is, the airbag coating surface coated with the rubber component at the joint surface (or the part that needs to be sewn) of the joint portion formed by joining the upper surface and the lower surface of the airbag fabric Apply. At this time, the application method of the sealant may adopt a conventional screen printing method, but considering the shape of the side curtain airbag having various joints, inflation, and non-expansion, a three-axis automatic robot dispensing system (3-axis Automatic Robot) Dispensing System) is preferably used, but is not particularly limited to the above manner.

In the present invention, as the heat sealant, one liquid type or two liquid type room temperature curing silicone resin or thermosetting silicone resin may be used, and the coating amount of the heat sealant per unit area is 35 to 110 g / m 2. Preferably, the ratio of 35 to 85 g / m 2 is advantageous in terms of the performance of folding, tearing strength, interfacial adhesion, pressure resistance, and the like of the airbag.

The coating thickness of the quench sealant may be adjusted in terms of ensuring the airtightness of the joint around the portion where sewing is required, and is preferably maintained uniformly at 0.5 to 1.3 mm, more preferably 0.5 to 1.0 mm. It is good to be able to. However, when the coating thickness of the heat sealant is less than 0.5 mm, the interface separation may easily occur between the air bag coating surface and the heat sealant coating surface during air bag deployment, and also it is not preferable because of the decrease in tear strength and pressure retention, 1.3 If it exceeds mm it may be undesirable in terms of foldability of the airbag.

In addition, the coating width of the heat sealant may be adjusted in terms of ensuring the airtightness of the joint around the portion where sewing is required, and is preferably 7 to 12 mm, more preferably 8 to 10 mm. It's good to be able to keep it. However, when the coating width of the heat sealant is less than 7 mm, the interface separation may easily occur between the air bag coating surface and the heat sealant coating surface during air bag deployment, and also it is not preferable because the tear strength and the pressure resistance retention rate decrease. If it exceeds mm it may be undesirable in terms of foldability.

In the side curtain type airbag of the present invention, after applying the sealant coating to the upper and lower surfaces of the airbag as described above, the sewing method is applied together to improve the airtightness and mechanical properties of the joint, and the sewing portion of the joint of the present invention is Even without a separate sealing process, air emissions do not increase significantly.

First, in the side curtain type airbag of the present invention, the sewing joint is bonded using a sewing thread including at least one selected from the group consisting of nylon-based yarns, polyester-based yarns, and p-aramid-based yarns. In consideration of the sewing thread, it is preferable to use yarns such as nylon 66, nylon 46, and heracron (p-aramid yarn), and most preferably nylon 66 can be used.

The thickness of the sewing thread may be used having a 420 to 1260 denier, preferably 840 to 1260 denier, it is most preferable to use a sewing thread having a thickness of 1260 denier considering the strength and elasticity.

The sewing thread may be used in the tensile strength of 58N or more, preferably 58N to 110N measured by the method of the American Society for Testing and Materials ASTM D 204-97, the preferred range is 89N to 110N, 840 denier for 1260 denier In the case of 58N to 80N can be used. If the tensile strength of the sewing thread is less than the above range, the strength of the sewing part is so weak that there is a problem that the sewing thread is torn off when deploying the airbag, and if the tensile strength is too large, the strength of the sewing part is too strong and the airbag fabric itself when the airbag is deployed There is a problem that tears.

In addition, the joint portion in the side curtain type airbag of the present invention can be used to select an effective sewing method according to the use of each part, and can be applied by adjusting the sewing method and the number of stitches such as single lock, double lock, single chain, double chain. Can be. However, preferably the number of stitches of the sewing portion can be sewn to 30 to 55 ea / 100mm, more preferably 40 to 50 ea / 100mm. At this time, if the number of stitches of the sewing part is less than 30 ea / 100mm, the strength of the sewing part is too weak, and there is a problem that the sewing thread is torn off at the joint part when the airbag is deployed.If the sewing part exceeds 55 ea / 100mm, the strength of the sewing part is too strong. The fabric itself may be torn during deployment, or the airbag cushion shape may be abnormally deployed, and the efficiency of sewing may be degraded.

In addition, the air curtain for the side curtain of the present invention can be manufactured through a cutting process in a general form through a conventional weaving method and refining process, except that the sealant coating and sewing method is applied to the joint of the fabric of the plain weave fabric. have.

In particular, the air curtain for the side curtain of the present invention using the fabric fibers weaving the dough for plain weave air bag, refining the dough for the woven airbag, the step of tentering the refined fabric, the tentered Cutting the fabric into an airbag shape, and may be prepared by a method comprising the step of sewing after applying the heat sealant to the bonding surface of the airbag.

In the manufacturing method of the side curtain airbag according to the present invention, the weaving step is used for weaving fabrics of general plain weave form without using a complicated jacquard loom used for weaving fabrics in the form of OPW (One Piece Woven). By using a rapier loom, an air jet loom or a water jet loom, the process can be simplified and the manufacturing cost can be effectively reduced.

In addition, the heat treatment temperature may be performed at 150 to 200 ° C., preferably at 160 to 190 ° C., in the tentering process so as to exhibit more excellent pressure resistance performance even under high humidity harsh conditions. When the heat treatment temperature of the tentering process is less than 150 ℃ may not be good for the uniformity and hardness side, if it exceeds 200 ℃ may not be good for the side ventilation.

The tentering fabric may be further applied to the coating process to lower the air permeability, if necessary.

In the cutting step of the present invention, the airbag shape refers to a shape representing an inflated part having a part property by gas and a non-expanded part supporting the inflated part. In the cutting step, before the application of the wax sealant to the scouring and tentering fabric and the compression curing step thereof, the cutting step is first cut with a laser or the like, followed by the coating of the sealant and pressing / curing to prepare an airbag. . In addition, the fabric coated with the sealant may be pressed with the other fabric not coated with the sealant, cured, and cut with a laser to manufacture a side curtain type airbag. However, when the laser cutting is carried out at the end of the manufacturing process, it is preferable to perform the cutting step first in consideration of the difficulty in cutting yield and the exact location of the cutting.

In the side curtain type airbag of the present invention, the heat sealant is applied to the inner surface of the fabric for airbags, that is, the joining surface, which forms the upper or lower surface of the airbag, and then compressed with the fabric for the other airbag to which the heat sealant is not applied. It can be prepared by a method comprising the step of curing to form a junction and sewing the junction.

On the other hand, as a method for measuring the internal pressure retention level of the side curtain type airbag according to the present invention, when the airbag is inflated when an instantaneous pressure of 25 bar is injected into the airbag without going through a separate aging process after the airbag is manufactured (starting deployment) It is preferable that the maximum pressure is 40 kPa or more, and the pressure after 6 second passes is maintained at 25 kPa or more. In particular, the side curtain type airbag of the present invention has a maximum pressure upon inflation of the initial airbag when an instantaneous pressure of 20 to 25 bar is injected into the airbag after aging for 408 hours or more at a temperature of 38 to 42 ° C and a relative humidity of 93 to 97% RH. The holding pressure should be more than 40 kPa, and the holding pressure after 6 seconds should be more than 25 kPa, which makes it possible to function as a side curtain airbag for vehicle rollover even under severe humidity conditions.

The side curtain type airbag of the present invention maintains a pressure resistance retention measured at room temperature of 70% or more, preferably 80% or more, and more preferably 90% or more even under severe humidity conditions. After 6 seconds elapsed pressure retention also has a very good pressure retention characteristics of 50% or more, preferably 60% or more of the initial pressure under the high humidity heating conditions.

In a preferred embodiment of the present invention, the internal pressure of the airbag can be measured using the apparatus as shown in FIG. After filling the primary high-compression tank with nitrogen in the measuring device at high pressure, the first solenoid valve is opened by a computer to adjust the secondary tank to fill nitrogen gas up to 25 bar. When the secondary tank is filled in this way, the first solenoid valve is closed, and the second solenoid valve is opened by the computer, and the compressed nitrogen gas charged to the secondary tank at 25 bar is momentarily maintained at atmospheric pressure. Exit and deploy the airbag. At this time, the initial maximum pressure inside the airbag is measured by the pressure sensor, the measurement results are transmitted to the computer, and after several seconds, the pressure is measured again and recorded by the computer.

In addition, in order to prevent rupture when the airbag is deployed by the actual high-pressure inflated, in the side curtain type airbag of the present invention, the sealant joint is manufactured by the American Material Testing Association standard without undergoing a separate aging process after the airbag is manufactured. The seam strength measured by the method of (ASTM) D 5822 is at least 1000 N, preferably 1500 to 2100 N, more preferably 1600 to 1900 N. In particular, the sealant joint in the side curtain type airbag of the present invention is a bark measured by the method of the American Society for Testing and Materials (ASTM) D 5822 after aging for 408 hours or more at a temperature of 38 to 42 ° C and a relative humidity of 93 to 97% RH. The strength can be 1350 to 1890 N, preferably 1500 to 1750 N, more preferably 1550 to 1700 N.

In the side curtain type airbag of the present invention, the sealant joint is maintained at 70% or more, preferably 80% or more, and more preferably 90% or more of the bark strength measured at room temperature without a separate airing process, under high humidity and harsh conditions. Even after aging, the strength of the sewing part can be secured in the optimum range. In addition, the interfacial adhesion between the rubber-coated surface and the sealant coating surface is maintained at a level of 90% or more, thereby minimizing the escape of air to the sealant joint during airbag deployment, thereby achieving excellent pressure resistance performance. have.

On the other hand, the present invention provides an airbag system including the above airbag. The airbag system can be equipped with conventional devices well known to those skilled in the art.

In the present invention, matters other than those described above can be added or subtracted as necessary, and therefore the present invention is not particularly limited.

The side curtain type airbag of the present invention can effectively protect the occupant from vehicle side windows and mechanisms when the vehicle rolls over or rolls with excellent pressure resistance performance even after aging under harsh conditions of high humidity.

Hereinafter, preferred examples are provided to help understanding of the present invention, but the following examples are merely to illustrate the present invention, and the scope of the present invention is not limited to the following examples.

In the present invention, the physical properties of the side curtain airbag were evaluated by the following method.

a) Air bag withstand pressure measurement:

As shown in FIG. 3, the change of the internal pressure of the airbag was observed over time after the airbag was deployed by instant injection of 25 bar of nitrogen compressed gas into the air. Since this operation is preferably controlled electronically to minimize the error, the electronic control device is used for the injection and blocking of the air.

b) Bark strength: American Society for Testing and Materials (ASTM) D 5822

Example  One

After weaving the fabric dough for plain weave airbags at a density of 49x49 (weft x weft) using a nylon 66 yarn of 420 deniers, a caustic soda solution bath and a roller type refining process were performed. The refined fabric was subjected to a process at a heat treatment temperature of 180 ° C. The fabric for airbags is coated on the non-coating fabric, which has undergone the tentering process, using a two-component silicone rubber with a knife over coating method so that the coating amount per unit area is 20 g / m ^2. Was prepared.

The airbag fabric was cut to have an airbag cushion shape with two upper and lower surfaces, respectively, using a laser cutting machine. Among the cut airbag fabrics, two-component, room-temperature-curable silicone resin 씸 silant is used per unit area by using a three-axis automatic robot dispensing system facility on the fabric forming the lower surface of the airbag. The coating amount was applied so as to be 45 g / m ² . At this time, the coating thickness of the heat sealant is 1 mm and the coating width is 10 mm, so that uniform coating is achieved.

After pressing the airbag lower surface fabric including the sealant coated joint and the sealant-free airbag upper surface fabric and curing at room temperature for 24 hours, a nylon 66 sewing thread (ASTM D 204) was formed along the centerline of the joint. The side curtain type airbag was manufactured by sewing a single lock using a -97 tensile strength of 106 N and a thickness of 1260 denier) to achieve a stitch number of 45 ea / 100 mm.

As a result of measuring the internal pressure of the airbag manufactured by the above method without a separate aging process, the initial maximum internal pressure at the moment of injecting 25 bar was 101 kPa, and the measured internal pressure after 6 seconds was 80 kPa, which was 6 seconds. The subsequent pressure retention rate was 79.2%. In addition, the bark strength measured by the above method at this time was 1820 N.

In addition, the air bag was measured at 38 to 42 ° C. and a relative humidity of 93 to 97% RH for 408 hours, and then the internal pressure of the air bag was measured. As a result, the initial maximum internal pressure was 90 kPa at a momentary pressure of 25 bar. The measured internal pressure became 71 kPa, and the internal pressure retention rate after 6 second became 78.9%. Incidentally, the bark strength measured by the above-mentioned method was 1810 N.

Example  2

After the per unit amount of the two-part room temperature the ssim sealant curing-type silicone resin on a lower from the air bag fabric, for the coating to be 60 g / m ^2, and compressing the air bag upper surface fabrics, except that the curing at room temperature for 24 hours, A side curtain airbag was manufactured in the same manner as in Example 1.

As a result of measuring the internal pressure of the airbag without a separate aging process by the above method, the initial maximum internal pressure at the moment of injecting 25 bar was 103 kPa, the measured internal pressure after 6 seconds was 84 kPa, and the pressure retention rate after 6 seconds was 81.6%. In this case, the bark strength measured by the above method was 1845 N.

In addition, the air bag was measured at 38 to 42 ° C. and a relative humidity of 93 to 97% RH for 408 hours, and then the internal pressure of the air bag was measured. The measured internal pressure became 75 kPa, and the internal pressure retention rate after 6 second became 78.9%. Incidentally, the bark strength measured by the above method was 1825 N.

Example  3

Except that the airbag fabric was coated at 75 g / m2 per unit area of the two-component room temperature curing silicone resin, the heat sealant, to be 75 g / m ² , and the airbag top fabric was pressed and cured at room temperature for 24 hours. A side curtain airbag was manufactured in the same manner as in Example 1.

As a result of measuring the internal pressure of the airbag without a separate aging process by the above method, the initial maximum internal pressure at the moment of 25 bar injection was 109 kPa, and the measured internal pressure after 6 seconds became 87 kPa, and the pressure retention rate after 6 seconds was 79.8%. In addition, the bar wooden strength measured by the method mentioned above was 1910N.

In addition, the air bag was measured at 38 to 42 ° C. and a relative humidity of 93 to 97% RH for 408 hours, and then the internal pressure of the air bag was measured. The measured internal pressure became 78 kPa, and the internal pressure retention rate after 6 seconds became 80.4%. In this case, the bark strength measured by the above method was 1915 N.

Example  4

Among the airbag fabrics, non-coating fabrics were coated with a two-component silicone rubber by knife over method to prepare 30 g / m ² of coating per unit area, and then fabricated airbag fabrics. Except for the rest, the final side curtain type airbag was manufactured in the same manner as in Example 1.

As a result of measuring the internal pressure of the airbag without a separate aging process by the above method, the initial maximum internal pressure at 102 bar instantaneous pressure injection was 102 kPa, and the measured internal pressure after 6 seconds became 81 kPa. 79.4%. Incidentally, the bark strength measured by the above method was 1825 N.

In addition, after measuring the air bag's internal pressure after aging for 408 hours at a temperature of 38 to 42 ℃, a relative humidity of 93 to 95% RH, the initial maximum internal pressure at 91 bar instantaneous pressure injection is 91 kPa, after 6 seconds The measured internal pressure became 72 kPa, and the internal pressure retention rate after 6 seconds became 79.1%. Incidentally, the bark strength measured by the above method at this time was 1815 N.

Example  5

Among the airbag fabrics, non-coating fabrics were coated using a two-component silicone rubber with a knife over method to make 40 g / m ² of coating per unit area. Except for the rest, the final side curtain type airbag was manufactured in the same manner as in Example 1.

As a result of measuring the internal pressure of the airbag without a separate aging process as described above, the initial maximum internal pressure was 106 kPa at 25 bar instantaneous pressure injection, and the measured internal pressure after 6 seconds became 82 kPa. 77.4%. In this case, the bark strength measured by the above-described method was 1856 N.

In addition, after measuring the air bag's internal pressure after aging for 408 hours at a temperature of 38 to 42 ℃, relative humidity 93 to 95% RH, the initial maximum internal pressure is 92 kPa at a momentary pressure injection of 25 bar, after 6 seconds The measured internal pressure became 73 kPa, and the internal pressure retention rate after 6 seconds became 79.3%. In addition, the rod strength measured by the above-mentioned method was 1840 N.

Example  6

Side curtain type in the same manner as in Example 1, except that the fabric for airbags was woven with a plain weave airbag fabric dough through a rapier loom at a density of 60x60 (weft x weft) using a nylon 66 yarn of 315 denier. Air bags were prepared.

As a result of measuring the internal pressure of the airbag without a separate aging process by the above method, the initial maximum internal pressure at the moment of injecting 25 bar is 81 kPa, and the measured internal pressure after 6 seconds is 50 kPa, and the pressure retention rate after 6 seconds is 61.7%. In addition, the bar neck strength measured by the above-mentioned method was 1690 N.

In addition, after measuring the internal pressure of the airbag after aging the airbag at a temperature of 38 to 42 ℃, relative humidity 93 to 95% RH for 408 hours, the initial maximum internal pressure is 78 kPa at a momentary pressure injection of 25 bar, after 6 seconds The measured internal pressure became 47 kPa, and the internal pressure retention rate after 6 seconds became 60.3%. In this case, the bark strength measured by the above method was 1693 N.

Example  7

Among the airbag fabrics, 315 denier nylon 66 yarns are used to weave the plain weave airbag fabric with a rapier loom at a density of 60x60 (weft x weft), and the two-component room temperature curable silicone resin on the bottom of the airbag fabric A side curtain type airbag was manufactured in the same manner as in Example 1, except that the coating amount per unit area was 60 g / m ² .

As a result of measuring the internal pressure of the airbag without a separate aging process by the above method, the initial maximum internal pressure at the moment of 25 bar instantaneous pressure injection was 80 kPa, and the measured internal pressure after 6 seconds became 52 kPa, and the pressure retention rate after 6 seconds was 65%. Incidentally, the bark strength measured by the above method was 1710 N.

In addition, after measuring the internal pressure of the airbag after aging the airbag at a temperature of 38 to 42 ℃, relative humidity 93 to 95% RH for 408 hours, the initial maximum internal pressure is 78 kPa at a momentary pressure injection of 25 bar, after 6 seconds The measured internal pressure became 49 kPa, and the internal pressure retention rate after 6 seconds became 62.9%. In addition, the bark strength measured by the above-mentioned method was 62.9 N.

Example  8

Among the airbag fabrics, 315 denier nylon 66 yarns are used to weave the plain weave airbag fabric with a rapier loom at a density of 60x60 (weft x weft), and the two-component room temperature curable silicone resin on the bottom of the airbag fabric A side curtain airbag was manufactured in the same manner as in Example 1, except that the coating amount per unit area was 75 g / m ² .

As a result of measuring the internal pressure of the airbag without a separate aging process as described above, the initial maximum internal pressure at the moment of 25 bar instantaneous pressure injection was 86 kPa, and the measured internal pressure after 6 seconds was 50 kPa, and the pressure retention rate after 6 seconds was 58.1%. In this case, the bark strength measured by the above method was 1720 N.

In addition, after measuring the air bag's internal pressure after aging for 408 hours at a temperature of 38 to 42 ℃, relative humidity 93 to 95% RH, the initial maximum internal pressure is 80 kPa at a momentary pressure injection of 25 bar, after 6 seconds The measured internal pressure became 49 kPa, and the internal pressure retention rate after 6 seconds became 61.3%. Incidentally, the bark strength measured by the above-mentioned method was 1706 N.

Example  9

After weaving the fabric for airbags, the side curtain type airbags were manufactured in the same manner as in Example 1, except that the heat treatment temperature of the tentering process was changed to 150 ° C.

As a result of measuring the internal pressure of the airbag without a separate aging process as described above, the initial maximum internal pressure was 94 kPa at 25 bar instantaneous pressure injection, and the measured internal pressure after 6 seconds became 73 kPa. 77.7%. Incidentally, the bark strength measured by the above-mentioned method was 1782 N.

In addition, the air bag was measured at 38 to 42 ° C. and a relative humidity of 93 to 95% RH for 408 hours, and then the internal pressure of the air bag was measured. The measured internal pressure became 75 kPa, and the internal pressure retention rate after 6 second became 77.3%. Incidentally, the bark strength measured by the above method was 1716 N.

Comparative example  One

Weaving a caustic soda solution bath after weaving the dough for side curtain type airbags with inflation and non-expansion from weaving using a jacquard loom with a density of 57x49 (inclined x weft) using a nylon 66 yarn of 420D. ) And a roller type refining process. The refined fabric was subjected to a tentering process at a heat treatment temperature of 180 ° C. The tentering process, the rough uncoated (Non-Coating) fabric knife coating (knife over ro1l coating) with the last side curtain after coating so that the 75 g / m ² the amount of coating per unit area using a two-component silicone rubber A mold air bag was produced.

As a result of measuring the internal pressure of the airbag without a separate aging process by the above method, the initial maximum internal pressure at 100 instantaneous pressure injection of 25 bar was 100 kPa, the measured internal pressure after 6 seconds became 75 kPa, and the pressure retention rate after 6 seconds was 79%. Incidentally, the bark strength measured by the above-mentioned method was 1706 N.

In addition, the air bag was measured at 38 to 42 ° C. and a relative humidity of 93 to 97% RH for 408 hours, and then the internal pressure of the air bag was measured. As a result, the initial maximum internal pressure at an instantaneous pressure injection of 25 bar was 97 kPa. The measured internal pressure became 75 kPa, and the internal pressure retention rate after 6 second became 77.3%. Incidentally, the bark strength measured by the above method was 1716 N.

Comparative example  2

A side curtain type airbag was manufactured in the same manner as in Comparative Example 1, except that the coating amount per unit area was 95 g / m ² using a two-component silicone rubber in the airbag fabric.

As a result of measuring the internal pressure of the airbag without a separate aging process by the above method, the initial maximum internal pressure was 105 kPa at 25 bar instantaneous pressure injection, and the measured internal pressure after 6 seconds became 82 kPa, and the pressure retention rate after 6 seconds was 78.1%. Incidentally, the bark strength measured by the above method at this time was 1714 N.

In addition, the air bag was measured at 38 to 42 ° C. and a relative humidity of 93 to 97% RH for 408 hours, and then the internal pressure of the air bag was measured. The measured internal pressure became 77 kPa, and the internal pressure retention rate after 6 seconds became 79.4%. In this case, the bark strength measured by the above method was 1720 N.

Comparative example  3

Comparative Example 1 using a jacquard weaving machine with a density of 60x60 (inclined x weft) using a nylon 66 yarn of 315D, except that weaving the dough for side curtain type airbags having inflation and non-expansion at the time of weaving. In the same manner as in the side curtain type airbag was prepared.

As a result of measuring the internal pressure of the airbag without a separate aging process by the above method, the initial maximum internal pressure at the moment of injecting 25 bar is 77 kPa, the measured internal pressure after 6 seconds is 38 kPa, and the pressure retention rate after 6 seconds is 49.4%. Incidentally, the bark strength measured by the above-mentioned method was 1392 N.

In addition, after measuring the internal pressure of the airbag after aging the airbag at a temperature of 38 to 42 ℃, relative humidity 93 to 95% RH for 408 hours, the initial maximum internal pressure at 75 bar instantaneous pressure injection is 75 kPa, after 6 seconds The measured internal pressure became 35 kPa, and the internal pressure retention rate after 6 seconds became 46.7%. In this case, the bark strength measured by the above method was 1401 N.

Comparative example  4

Except for using a jacquard weaving machine with a density of 60x60 (inclined x weft) using a nylon 66 yarn of 315D and a coating amount per unit area of 95 g / m ² using two-component silicone rubber. A side curtain airbag was manufactured in the same manner as in Comparative Example 1.

As a result of measuring the internal pressure of the airbag without a separate aging process as described above, the initial maximum internal pressure was 78 kPa at 25 bar instantaneous pressure injection, and the measured internal pressure after 6 seconds became 39 kPa. 50%. In addition, the rod strength measured by the method mentioned above was 1410N.

In addition, after measuring the air bag's internal pressure after aging for 408 hours at a temperature of 38 to 42 ℃, relative humidity 93 to 95% RH, the initial maximum internal pressure is 73 kPa at a momentary pressure injection of 25 bar, after 6 seconds The measured internal pressure became 36 kPa, and the internal pressure retention rate after 6 seconds became 49.3%. Incidentally, the bark strength measured by the above-mentioned method was 1382 N.

Comparative example  5

After weaving the fabric for airbags, the side curtain type airbags were manufactured in the same manner as in Comparative Example 1 except that the heat treatment temperature of the tentering process was changed to 150 ° C.

As a result of measuring the internal pressure of the airbag without a separate aging process, the initial maximum internal pressure was 95 kPa at 25 bar instantaneous pressure injection, and the measured internal pressure after 6 seconds became 75 kPa. 78.9%. In addition, the bark strength measured by the method mentioned above was 1689 N.

In addition, after measuring the internal pressure of the airbag after aging for 408 hours at a temperature of 38 to 42 ℃, relative humidity 93 to 95% RH, the initial maximum internal pressure at 93 bar instantaneous pressure injection is 93 kPa, after 6 seconds The measured internal pressure became 72 kPa, and the internal pressure retention rate after 6 seconds became 77.4%. In addition, the bar neck strength measured by the above-mentioned method was 1690 N.

The airbag internal pressure measurement results prepared according to Examples 1 to 9 and Comparative Examples 1 to 5 are shown in Table 1 below.

division  Tentering Temperature (℃) Before aging After aging Remarks Initial maximum pressure (Kpa) Pressure after 6 seconds (Kpa) Bark Strength (N) Initial maximum pressure (Kpa) Pressure after 6 seconds (Kpa) Bark Strength (N) Example 1 180 101 80 1820 90 71 1810 씸 Silent Example 2 180 103 84 1845 95 75 1825 씸 Silent Example 3 180 109 87 1910 97 78 1915 씸 Silent Example 4 180 102 81 1825 91 72 1815 씸 Silent Example 5 180 106 82 1856 92 73 1840 씸 Silent Example 6 180 81 50 1690 78 47 1695 씸 Silent Example 7 180 80 52 1710 78 49 1715 씸 Silent Example 8 180 86 50 1720 80 49 1706 씸 Silent Example 9 150 94 73 1782 86 68 1802 씸 Silent Comparative Example 1 180 100 79 1706 97 75 1716  OPW Comparative Example 2 180 105 82 1714 97 77 1720 OPW Comparative Example 3 180 77 38 1392 75 35 1401 OPW Comparative Example 4 180 78 39 1410 73 36 1385 OPW Comparative Example 5 150 95 75 1689 83 72 1690 OPW

Compared with the side curtain type airbags produced in Comparative Examples 1 to 5 of the OPW type as shown in Table 1 above, the bar neck strength and the airbag development of the heat sealing type side curtain airbags of Examples 1 to 9 according to the present invention. By showing the internal pressure retention rate after 6 seconds with similar or high dimensions, it can be seen that the side curtain type airbag of the present invention has a very good performance in terms of airtightness and strength at deployment under severe humidity conditions.

Furthermore, the side curtain type airbags of Examples 1 to 9 according to the present invention are not sealant seals but are not one piece of type (OPW) type of Comparative Examples 1 to 5, which use expensive Jacquard looms having a complicated structure. Not only is it advantageous in that it can provide excellent pressure resistance performance through the application and sewing method of, but also has the advantage of obtaining an excellent effect of simplifying the process and reducing the manufacturing cost.

The side curtain type airbag of the present invention utilizes a plain weave fabric and optimizes the sealant coating and sewing method between the inflated part and the non-expanded part, and optimizes the refining and tenting process, so that the airbag can be deployed even under severe humidity conditions. By improving the airtightness to prevent gas leakage, it improves the physical properties such as pressure-resistance performance of the airbag, and also eliminates the separate sealing process for the sewing parts without using a jacquard loom with a complicated structure, simplifying the process You can save money.

1 is a schematic diagram showing a side curtain airbag according to an embodiment of the present invention.

Figure 2 is a schematic diagram showing a cross section of the junction portion 2 of the side curtain airbag according to an embodiment of the present invention.

Figure 3 is a schematic diagram showing the internal pressure measuring apparatus of the side curtain airbag according to an embodiment of the present invention.

Claims (18)

Expansion part which has a part property by gas, A non-expansion portion supporting the inflation portion, and It includes a junction forming a boundary between the expanded portion and the non-expanded portion, The sealant is coated and sewn on the bonding surface of the bonding portion, After aging more than 408 hours at a temperature of 38 to 42 ° C. and a relative humidity of 93 to 97% RH, when an instantaneous pressure of 20 to 25 bar is injected into the airbag, the maximum pressure at initial airbag inflation is at least 40 kPa, and is maintained after 6 seconds. Side curtain airbags with a pressure greater than 25 kPa. The method of claim 1, The heat sealant joint is a side curtain type having a bark strength of 1350 to 1890 N measured by the method of the American Society for Testing and Materials (ASTM) D 5822 after aging for more than 408 hours at a temperature of 38 to 42 ° C and a relative humidity of 93 to 97% RH. Airbag. The method of claim 1, A side curtain type airbag having a maximum pressure of 40 kPa or more at initial airbag inflation and a holding pressure of at least 25 kPa after 6 seconds when an instantaneous pressure of 25 bar is injected into the airbag before applying the aging. The method of claim 1, The sealant joint is a side curtain type airbag having a tensile strength of 1500 to 2100 N measured by the method of ASTM D 5822 before applying the aging. The method of claim 1, The airbag is a side curtain type airbag that uses one or more fabrics selected from the group consisting of nylon fabric, polyester fabric, polyolefin fabric, and aramid fabric. The method of claim 5, The fabric is a side curtain type airbag coated with a rubber component selected from the group consisting of powder type silicone, liquid type silicone, and mixtures thereof. The method of claim 6, Side curtain type airbag having a coating amount of 20 to 100 g / m ² per unit area of the rubber component. The method of claim 1, The heat sealant is a side curtain type airbag comprising a one-component or two-component room temperature curable silicone resin or a thermosetting silicone resin. The method of claim 1, A side curtain airbag having a coating amount of 35 to 110 g / m ² per unit area of the sealant. The method of claim 1, A side curtain airbag having a sealant thickness of 0.5 to 1.3 mm. The method of claim 1, A side curtain airbag having a coating width of the sealant of 7 to 12 mm. The method of claim 1, The joint portion is a side curtain type airbag sewn using a sewing thread including at least one selected from the group consisting of nylon yarn, polyester yarn and p-aramid yarn. The method of claim 1, The joint portion is a side curtain airbag sewn so that the number of stitches of the sewing portion is 30 to 55 ea / 100mm. The method of claim 1, The joining portion is a side curtain type airbag that the fineness is sewn using a sewing thread of 420 to 1260 denier. Weaving the dough for plain weave air bags using fibers for airbag fabric; Refining the dough for the woven airbag; Tentering the refined fabric; Cutting the tentered fabric into an airbag shape; And Step of sewing after applying the sealant to the bonding surface of the airbag Method of producing a side curtain airbag comprising a. The method of claim 15, The fabric for the airbag fabric is a method of producing a side curtain airbag of at least one selected from the group consisting of nylon yarn, polyester yarn, polyolefin yarn, and aramid yarn. The method of claim 12, Method for producing a side curtain airbag having a heat treatment temperature of 150 to 200 ℃ in the tenter step An airbag system comprising a side curtain airbag according to any one of the preceding claims.

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