KR101073662B1 - Airbag cushion and airbag system using the same - Google Patents

Abstract

The present invention relates to an airbag cushion and an airbag system comprising the same, in particular, at least one textile fabric; And a sewing part for joining the fabric, wherein the length of the upper thread sewing thread per unit length of the fabric has a deviation of 15% or less between the first sewing part sewing in the forward direction and the second sewing part sewing in the reverse direction among the sewing parts. Relates to an airbag cushion.

The airbag cushion of the present invention optimizes the physical properties of the sewing unit to provide excellent work stability and airbag deployment performance, together with excellent form stability and air blocking effect, and minimize the impact on the passengers to protect the occupants safely.

Airbag Cushion, Sewing Part, Bark Strength, Elongation, Pressure Resistance

Description

AIRBAG CUSHION AND AIRBAG SYSTEM USING THE SAME

The present invention relates to an airbag cushion and an airbag system including the same, and more particularly, to an airbag cushion having an excellent working stability and airbag deployment performance by optimizing the physical properties of the sewing unit and an airbag system including the same.

In general, 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 gas into the airbag cushion. By means of supplying and inflating, it refers to a device for protecting the driver and passengers, the structure of a general airbag cushion system is as shown in FIG.

As shown in FIG. 1, a general airbag cushion system includes an inflater 121 that generates gas by ignition of the primer 122, and an airbag cushion 124 that is expanded and deployed toward the driver of the driver's seat by the generated gas. Consists of the airbag cushion module 100 is mounted to the steering wheel 101, the shock sensor 130 for generating a shock signal when a collision, and the ignition of the primer 122 of the inflator 121 according to the shock signal It is configured to include a magnetic control module (Electronic Control Module) (110). The airbag cushion system configured as described above detects an impact in the impact sensor 130 and transmits a signal to the electronic control module 110 when the vehicle collides at the front. At this time, the electronic control module 110 that recognizes this ignites the primer 122, and burns the gas generating agent inside the inflator 121. The gas generator thus burned inflates the airbag cushion 124 through rapid gas generation. The inflated airbag cushion 124 partially absorbs the impact load caused by the collision while contacting the front upper body of the driver, and the inflated airbag cushion 124 as the head and chest of the driver move forward by inertia; In the event of a collision, the gas of the airbag cushion 124 is rapidly discharged to the discharge hole formed in the airbag cushion 124 and is cushioning the front part of the driver. Therefore, the secondary injury can be reduced by effectively buffering the impact force transmitted to the driver during frontal collision.

As described above, the airbag cushion used in the vehicle is manufactured in a predetermined form, and then mounted in a handle or an automobile side window or side structure of the vehicle in a folded state to minimize its volume. At this time, while fixing to the vehicle body using a tab portion of the airbag cushion and the like, while maintaining the folded state, the airbag cushion is inflated and deployed when the inflator 121 is operated.

In this case, typically the sewing type airbag includes a fabric and a sewing portion for bonding the fabric. That is, since the part of the air is mainly discharged during the deployment of the airbag is a sewing portion, the physical properties such as the sewing strength and elongation of the sewing portion is important. In particular, in order to exhibit excellent inflation performance and deployment performance when deploying airbags due to rapid gas generation, etc., the bonding performance for each part of the airbag cushion should be effectively maintained.

However, the sewing type airbag to which the conventional automatic sewing machine is applied is not sufficient to provide effective inflation performance and deployment performance in airbag operation when the physical properties such as sewing strength and elongation of the sewing unit. Such a problem is limited only by the material change of the sewing material applied to the sewing part, and there is an urgent need for technology development that can optimize the properties of the sewing part without changing the material.

Therefore, there is a need for a study on the development of an airbag cushion including a sewing unit having excellent mechanical properties and an air barrier effect so as to exert excellent inflation performance and deployment performance during airbag deployment.

The present invention is to provide an airbag cushion having an excellent air barrier property and pressure resistance maintaining performance by optimizing the physical properties of the sewing unit and an airbag system including the same.

The present invention is one or more textile fabrics; And a sewing part for joining the fabric, wherein the length of the upper thread sewing thread per unit length of the fabric has a deviation of 15% or less between the first sewing part sewn in the forward direction and the second sewing part sewn in the reverse direction among the sewing parts. Provide airbag cushions.

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

Hereinafter, an airbag cushion, a method of manufacturing the same, and an airbag system including the same according to a specific embodiment of the present invention will be described in detail. However, this is presented as an example of the invention, whereby the scope of the invention is not limited, it is apparent to those skilled in the art that various modifications to the embodiments are possible within the scope of the invention.

In addition, unless otherwise indicated throughout the specification, "including" or "containing" refers to the inclusion of any component (or component) without particular limitation and refers to the addition of another component (or component). It cannot be interpreted as excluding.

The present invention by applying the optimized sewing conditions and sewing method for the sewing unit for bonding when manufacturing the airbag cushion, improve the sewing strength and elongation of the sewing unit to exhibit excellent deployment performance when inflating the airbag and maintain excellent pressure resistance performance It can be secured.

Airbag cushions are generally made by sewing and bonding the fabric to define the portion that inflates when the inflator bursts. More specifically, in manufacturing the airbag cushion by sewing the fabric for the airbag by the automated method by a general method, as shown in Figure 2, the lower thread 201 and the upper thread 202 on the fabric fabric 200 is It is used, the sewing proceeds while the upper thread 202 is supplied from the sewing device to the lower thread 201 in a predetermined direction. At this time, while the fabric fabric 200 is fixed, the needle of the sewing device moves while changing the direction and the sewing proceeds while the upper thread 202 is supplied in the same direction as the needle.

Therefore, even when sewing the fabric forming one airbag cushion, the supply direction of the upper thread to the fabric may be changed, the supply direction of the upper thread 202 to the lower thread 201 may also be changed (see FIG. 2).

Depending on the feeding direction of this upper thread 102, "forward" or "reverse" may be defined. Of these, the "forward direction", as shown in Figures 2, 3, 5, the supply direction of the upper thread 202 and the fabric of the upper thread 202 that the upper thread 202 can sew without twisting with respect to the lower thread 201 Can be defined as referring to the sewing direction (see FIGS. 2, 3, and 5), and “reverse direction” means that the upper thread 202 is twisted against the lower thread 201, as shown in FIGS. This may be defined as referring to the supply direction of the upper thread 202 and the sewing direction of the fabric to which sewing is performed (see FIGS. 2, 4, and 6).

By the way, this sewing direction, ie, "forward" or "reverse direction" is different whether or not the upper thread 102 twisted to the lower thread 100, between the sewing thread sewn in these "forward" and "reverse direction, respectively, upper thread sewing thread The required length of can vary.

As a result of the experiments of the present inventors, it has been found that the physical properties of the sewing part can be optimized to greatly improve the air barrier property and the pressure resistance performance of the airbag cushion by maintaining the deviation of the required length of the sewing thread below a certain level.

Accordingly, the present invention prevents the mechanical property deterioration when sewing in the reverse direction, so that both the first sewing portion sewn in the forward direction and the second sewing portion sewn in the reverse direction ensure uniform mechanical properties and at the same time the airbag cushion Improved properties can also be achieved in the development performance of.

According to one embodiment of the present invention, an airbag cushion including a sewing part having predetermined characteristics is provided. Such airbag cushions include one or more textile fabrics; And a sewing unit for bonding the fabric, wherein the length of the upper thread sewing thread per unit length of the fabric has a deviation of 15% or less between the first sewing unit sewing in the forward direction and the second sewing unit sewing in the reverse direction among the sewing units. Can be

The airbag cushion of the present invention is a deviation (△ L) of the sewing thread required length (L ₁ ) of the first sewing portion sewn in the forward direction per unit length of the airbag cushion fabric and the sewing thread required length (L ₂ ) of the second sewing portion sewn in the reverse direction Can be up to 15% or 1% to 15%, preferably up to 12% or 1.5% to 12%, more preferably up to 10% or 2% to 10%. In particular, the required length deviation ΔL of the sewing thread in the first sewing part and the second sewing part may be represented by the following formula (1).

[Calculation 1]

In the formula, L ₁ is the sewing thread required length per unit length of the fabric in the first sewing portion sewing in the forward direction, L ₂ is the sewing thread required per unit length of the fabric in the first sewing portion sewing in the forward direction.

Here, the sewing thread required length deviation (ΔL) between the first sewing portion and the second sewing portion is the first sewing sewing in a forward direction from the sewing thread required length (L ₂ ) per unit length of the fabric in the second sewing portion sewn in the reverse direction It can be expressed as a percentage value in the sewn portion of the absolute value of the difference value between the bongjesa required length (L ₁₎ per unit length of the fabric in the first sewing bongjesa required length (L ₁₎ portion.

In specifying the sewing thread required length deviation (ΔL) between the first sewing portion and the second sewing portion in the airbag cushion of the present invention, it is used for each of the second sewing portion sewn in the reverse direction and the first sewing portion sewn in the forward direction When the same type of yarn, thickness, sewing method, number of stitches, etc. are applied in the same way, a more preferable effect can be obtained.

In addition, when the sewing thread required length deviation (ΔL) between the first sewing portion and the second sewing portion sewn in the forward and reverse directions exceeds 15%, sewing in the reverse direction compared to the first sewing portion sewn in the forward direction The mechanical properties of the second sewing unit may be remarkably inferior, and the air barrier property and the pressure resistance performance of the airbag airbag cushion may be greatly reduced according to the difference in physical properties between the first sewing unit and the second sewing unit.

Therefore, according to the present invention, the physical properties of the airbag cushion can be optimized only by adjusting the required length of the sewing thread according to the sewing direction. In particular, the airbag cushion of the present invention by optimizing the sewing thread required length deviation (△ L) between the first sewing portion and the second sewing portion sewn in the forward and reverse directions, respectively, by 15% or less, A similar degree of excellent mechanical properties can be obtained, and improved properties can also be obtained with excellent air barrier performance, airtightness, and deployment performance.

In the airbag cushion of the present invention, the sewing portion is bonded using a sewing thread including at least one selected from the group consisting of nylon yarn, polyester yarn, polyolefin yarn, and aramid yarn, and sewing thread in terms of heat resistance and shrinkage. As the yarn, it is preferable to use yarns such as nylon 66, nylon 46, kevlar (aramid yarn), and most preferably nylon 66 can be used.

The thickness of the sewing thread, that is, the total fineness may be used having a 210 to 1260 denier, preferably 840 to 1260 denier, the sewing thread thickness is preferably 210 denier or more in terms of strength, the sewing thread thickness in terms of resistance (elasticity) Is preferably 1260 denier or less. The denier is a unit representing the thickness of the yarn or fiber, and is 1 denier when the length is 9000 m 1g.

The sewing thread can be used in the tensile strength of 58 N or more, preferably 58 N to 110 N measured by the method of the American Society for Testing and Materials ASTM D 204-97 standard, the preferred range is 89 N to 1,260 denier In the case of 110N and 840 denier, it can be used as 58N-80N. When the tensile strength of the sewing thread is smaller than the above range, the strength of the sewing portion is so weak that the sewing portion may be torn off during manufacture or deployment of the airbag, and when the tensile strength is too large, the strength of the sewing portion is too strong when the airbag is deployed. The deployment time or shape of the airbag may be abnormally deployed.

In addition, the sewing unit in the airbag cushion of the present invention can be used to select an effective sewing method according to the use of each part, it is possible to apply one or more sewing methods of single lock, double lock, single chain, double chain.

The sewing unit may be applied by adjusting the number of stitches in the optimum range according to the use of each part or according to the sewing method, preferably 20 to 80 ea / 100mm, more preferably 25 to 75 ea / 100mm, more preferably The sewing can be bonded while controlling the number of stitches to 30 to 70 ea / 10mm. At this time, if the number of stitches of the sewing portion is less than 20 ea / 100mm, the strength of the sewing portion is too weak during manufacture or development, the sewing portion may be torn off, and if the number of stitches exceeds 80 ea / 100mm, the strength of the sewing portion is too strong When the fabric is damaged or when the airbag is deployed, the airbag deployment time or shape may be abnormally deployed.

The sewing portion of the airbag cushion is 100 to 400 kgf / inch, preferably 130 to 350 kgf / inch, most preferably 150 to 300 kgf / inch, measured by the method of the American Society for Testing and Materials, ASTM D 1683. Can be In addition, the elongation measured by the method of the American Society for Testing and Materials ASTM D 1683 may be 15% to 80%, preferably 20% to 70%, and most preferably 25% to 60%. The sewing portion of the airbag cushion according to the present invention preferably maintains the strength and elongation in the above range in terms of securing the strength of the sewing portion in the optimum range and achieving an effective pressure-resistant maintenance performance.

In the airbag cushion of the present invention, when the instantaneous pressure of 25 bar is injected into the airbag cushion and the airbag internal pressure is measured, the maximum pressure at the initial airbag inflation (at start) is preferably 100 KPa or more, more preferably 105 KPa. More preferably 110 KPa or more. This excellent pressure resistance performance can exhibit excellent performance as a safety system (safety system) when the airbag cushion of the present invention is mounted on a vehicle airbag system.

 In a preferred embodiment of the present invention, the internal pressure of the airbag cushion can be measured using a device 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 airbag cushion momentarily maintains the atmospheric pressure of compressed nitrogen gas charged to the secondary tank at a pressure of 25 bar. Escape the airbag cushion. At this time, the initial maximum pressure inside the airbag cushion is measured by the pressure sensor and recorded by the computer.

Therefore, the airbag cushion of the present invention is preferably injected at an instantaneous pressure of 25 bar satisfying the above conditions, the initial maximum pressure is 100 KPa or more, the sewing strength of the sewing portion is 100 kgf / inch or more, the elongation is 80 It may be less than or equal to%.

On the other hand, the fabric fabric in the airbag cushion of the present invention can be used both fabric or non-woven fabric known in the art for the manufacture of airbag cushion, it is not limited to that kind. For example, the fabric or nonwoven fabric may be a fabric or nonwoven fabric including a fiber selected from the group consisting of nylon fibers, polyester fibers, polyolefin fibers, and aramid fibers. For example, a textile fabric including nylon 66, polyethylene terephthalate (PET), polypropylene (PP), or the like can be used. The type of the woven fabric or the nonwoven fabric of the woven fabric used in the present invention is also not particularly limited, but nylon 66 or the like is preferably used in consideration of the strength of the sewing portion.

Preferably, the textile fabric may further include a rubber component coating layer coated or laminated on one or both surfaces thereof. The rubber component may include at least one selected from the group consisting of powder type silicone, liquid type silicone, polyurethane, chloroprene, neoprene rubber, and emulsion type silicone resin, and the coating rubber component. The type of is not limited only to the above-mentioned materials. However, silicone coating is preferable in terms of environmentally friendly and mechanical properties.

At this time, the coating amount per unit area of the rubber component coating layer may be used to 20 to 200 g / m ² , preferably 20 to 100 g / m ² . Particularly, in the case of manufacturing an OPW (One Piece Woven) type side curtain type airbag, the coating amount is preferably 30 to 95 g / m ² , and in the case of plain weave type fabric, the coating amount is 20 to 50 g / m ² level is preferred.

On the other hand, according to another embodiment of the present invention, there is provided a method of manufacturing an airbag cushion in which the physical properties of the sewing unit is optimized to a specific range. The method of manufacturing the airbag cushion includes cutting at least one textile fabric, and sewing bonding the textile fabric, wherein the sewing bonding process is performed by sewing the fabric in a reverse direction with the first sewing portion sewn in a forward direction. The length of the upper thread sewing thread per unit length of the fabric between the two sewing parts may be performed so that the deviation of 15% or less.

In the method of manufacturing the airbag cushion, each sewing thread tension may be adjusted to the optimum range in the forward and reverse sewing so that the first sewing portion sewn in the forward direction and the second sewing portion sewn in the reverse direction can be effectively formed. In particular, in order to manufacture the airbag cushion according to the present invention, the tension of the upper thread sewing thread when sewing in the reverse direction 105% to 140%, preferably 107% to 135%, more preferably compared to the tension of the upper thread sewing thread when sewing in the forward direction The adjustment can be applied to 110% to 130%.

At this time, when the tension range of the sewing thread when sewing in the reverse direction is less than 105% compared to the tension when sewing in the forward direction, the mechanical properties of the second sewing portion sewn in the reverse direction is significantly lowered, air barrier properties and pressure resistance performance Degradation and thus deployment performance may be significantly reduced. In addition, when sewing in the reverse direction when the tension range of the sewing thread is applied in excess of 140% of the tension when sewing in the forward direction, the yarn is cut or trimmed during the sewing process, the entire process is not performed smoothly or the strength of the sewing portion is too By being strong, the fabric may be damaged or the deployment point or shape of the airbag may be abnormally deployed when the airbag is deployed.

In the manufacturing method of the airbag cushion, the sewing bonding process can be used any device known to be available for the sewing-type airbag, can be operated using an industrial sewing machine, such as moving the head in terms of process efficiency. In particular, when sewing in the forward and reverse directions, a separate sewing thread tension adjusting device may be added to adjust the sewing thread tension to an optimum range, and the sewing thread tension adjusting device may be manually operated or digitally controlled through computer programming. contoller).

In addition, when manufacturing the airbag cushion of the present invention, the fabric or non-woven fabric used as a fabric fabric can be prepared according to a conventional method, it can be used to select the satisfactory conditions of the airbag cushion from the conventional fabric or nonwoven fabric. . If necessary, the airbag cushion of the present invention may be processed through an additional process such as silicone rubber coating after manufacturing the airbag cushion fabric through a conventional weaving method, refining and heat setting process. The airbag cushion fabric coated as described above is manufactured into a predetermined airbag cushion through a cutting and sewing process as described above. At this time, the airbag cushion is not limited to a special form and may be manufactured in a general form.

On the other hand, according to another embodiment of the present invention, there is provided an airbag system including the airbag cushion described above. In particular, the airbag system may include an airbag cushion to which a sewing unit having predetermined characteristics is applied, and the airbag system may include a conventional device well known to those skilled in the art.

The airbag can be broadly classified into a front airbag (front type airbag) and a side airbag. The front airbags may be of the kind of driving, a passenger seat, a knee, ankle, and the like, and the side airbag includes a side airbag and a curtain airbag of an automobile. Accordingly, the airbag may be a front airbag, a side airbag or a curtain airbag.

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

According to the present invention, there is provided an airbag cushion having excellent work stability and airbag deployment performance of a sewing unit, and an airbag system including the same.

The airbag cushion improves the sealing strength and elongation of the sewing portion and ensures excellent pressure resistance performance, thereby optimizing the physical properties of the sewing portion in a predetermined range, thereby exhibiting excellent deployment performance when the airbag is inflated. And it provides an air blocking effect and can minimize the impact on the passengers to protect the occupants safely.

Therefore, the airbag cushion of the present invention can be very preferably used for a vehicle airbag system and the like.

Hereinafter, the present invention will be described in more detail with reference to the following examples. However, the scope of the present invention is not limited to the following examples.

Example  1-2

After weaving the fabric under the conditions shown in Table 1 below, the airbag is coated with a non-coating fabric or a coating fabric applied with a knife over ro1l coating method, which has undergone a refining and tentering process. It was used as a cushion fabric fabric. The fabric fabric was cut using a laser cutting machine, and the fabric was sewn and bonded using an industrial sewing machine whose head was moved under sewing conditions as shown in Table 1, thereby manufacturing an airbag cushion.

At this time, the type of sewing thread, sewing method, the length of the upper thread and the respective deviations during sewing in the forward and reverse directions, the type and weaving form of the fabric, coating components and coating amount are shown in Table 1 below. Here, the tensile strength of the sewing thread is a value measured according to the American Material Testing Association standard ASTM D 206-97, and the required length of the sewing thread upper thread in the first sewing part sewing in the forward direction and the second sewing part sewing in the reverse direction is The required length of the upper thread per unit length (10 cm) is shown. In addition, the types of sewing thread used in the first sewing portion and the second sewing portion, the sewing method, the number of stitches and the like were applied in the same manner. The rest of the conditions were in accordance with conventional conditions for the manufacture of airbag cushions.

Comparative example  One

The airbag cushion of Comparative Example 1 was prepared in the same manner as in Examples 1 and 2, except that the conditions were changed as described in Table 1, and physical properties thereof were shown in Table 1 below.

Physical properties of the airbag cushions prepared according to Examples 1 and 2 and Comparative Example 1 were measured by the following methods, and the measured physical properties are summarized in Table 1 below.

a) bark strength and elongation

The bark strength and elongation of each of the first sewing part sewing in the forward direction and the second sewing part sewing in the reverse direction in the airbag cushion were measured.

First, the specimen of the airbag cushion was fixed to the lower clamp of the measuring device according to the ASTM D 1683 method of the American Society for Testing and Materials, and the bark strength and elongation at the time of breaking the airbag cushion specimen were measured while moving the upper clamp upward.

b) Internal pressure measurement when inflating the airbag cushion

As shown in Figure 7, after the air bag cushion is deployed by instant injection of 25 bar nitrogen gas into the air (Air) to observe the change in the internal pressure of the air bag hourly, the maximum internal pressure during the initial air bag cushion inflation Table 1 Shown in In particular, since this operation is preferably controlled electronically to minimize the error, the electronic control device is used here for the injection and blocking of the air.

division Example 1 Example 2 Comparative Example 1 Sewing thread type Nylon 66 Nylon 66 Nylon 66 Sewing thread tensile strength (N) 100.9 107.8 100.9 Sewing thread Total Fineness (de) 1260 1260 1260 Sewing Single rock Single rock Single rock Sewing stitch number (ea / 100mm) 65 65 65 First sewing thread upper thread length (mm) 329 324 330 Second sewing thread upper thread length (mm) 344 335 390 1st sewing part / 2nd sewing part upper thread deviation (%) 4.6 3.4 16.7 Type of fabric Nylon 66 Nylon 66 Nylon 66 Total fineness of fabric (de) 420 420 420 Weaving density of the fabric 49X49 49X49 49X49 Weaving type of fabric (plain weave / OPW) Plain weave Plain weave Plain weave Rubber ingredient silicon silicon silicon Rubber coating amount (g / m ² ) 25 25 25 % Of upper thread sewing thread tension compared to the forward direction 110 125 100 1st Sewing Bar Thread Strength (kgf) 233 231 238 Second sewing part sewing strength (kgf) 219 221 170 First sewing part elongation (%) 48 47 51 Second sewing department elongation (%) 52 50 87 Maximum Internal Pressure at Expansion (kPa) 125 126 97

8 and 9 show graphs of measurement results of internal pressure during inflation of the airbag cushions of Example 1 and Comparative Example 1, respectively.

As shown in Table 1, in Examples 1 and 2 in which the physical properties of the sewing part are optimized, the sewing part of the airbag cushion ensures uniform bonding performance as a whole, and thus the maximum pressure when inflating the initial airbag cushion with excellent sewing strength and elongation. It can be seen that the 125-126 kPa has excellent pressure resistance performance. In particular, the airbag cushion of Examples 1 to 2 exhibits a degree similar to the sewing strength and elongation of the sewing sewing part of the reverse sewing sewing part and the sewing strength of the sewing sewing part of the forward sewing, it can be confirmed that the overall airbag cushion having excellent physical properties uniformly. .

On the other hand, in the case of Comparative Example 1 in which the sewing process was performed in a uniform manner without separate optimization of the physical properties of the forward and reverse sewing parts as in the past, the overall strength and elongation were significantly reduced, thereby providing a uniform and excellent overall sewing joint performance. It can not be seen. Particularly, in the airbag cushion of Comparative Example 1, the elongation of the second sewing portion sewn in the reverse direction reaches about 87%, and the elongation of the second sewing portion exceeds about 170% of the elongation of the first sewing portion sewn in the forward direction. It can be seen that. Accordingly, the sewing strength of the second sewing portion sewn in the reverse direction in the airbag cushion of Comparative Example 1 is only about 71% compared to the sewing strength of the first sewing portion sewn in the forward direction, and the maximum pressure during inflation of the initial airbag cushion is also 97 kPa. It can be seen that the overall physical properties and development of the airbag cushion is poor because it is significantly reduced.

1 shows a typical airbag system.

Figure 2 is a schematic diagram showing a second sewing portion sewn in the reverse direction and the first sewing portion sewn in the forward direction in the airbag cushion according to an embodiment of the present invention.

Figure 3 is a schematic diagram showing the structure of the upper thread and the lower thread of the first sewing portion sewn in the forward direction in the airbag cushion according to an embodiment of the present invention.

Figure 4 is a schematic diagram showing the structural structure of the upper thread and the lower thread of the first sewing part sewn in the reverse direction in the airbag cushion according to an embodiment of the present invention.

Figure 5 is a photograph showing the structure of the upper thread and the lower thread of the first sewing part sewn in the forward direction in the airbag cushion according to an embodiment of the present invention.

Figure 6 is a photograph showing the structure of the upper thread and the lower thread of the second sewing part sewn in the reverse direction in the airbag cushion according to an embodiment of the present invention.

Figure 7 is a schematic diagram showing the internal pressure measurement apparatus of the airbag cushion according to an embodiment of the present invention.

8 is a graph showing the internal pressure measurement results of the airbag cushion including a sewing part according to Example 1 of the present invention.

9 is a graph showing the internal pressure measurement results of the airbag cushion including a sewing part according to Comparative Example 1 of the present invention.

Claims (11)

One or more textile fabrics; And Including a sewing unit for bonding the fabric, An airbag cushion having a deviation of 15% or less of the length of the upper thread sewing thread per unit length of the fabric between the first sewing part sewn in the forward direction and the second sewing part sewn in the reverse direction among the sewing parts. The method of claim 1, The textile fabric is an airbag cushion which is a woven or nonwoven fabric comprising one or more fibers selected from the group consisting of nylon fibers, polyester fibers, polyolefin fibers, and aramid fibers. The method of claim 1, Air sewing cushion, wherein the sewing yarn comprises one or more selected from the group consisting of nylon yarn, polyester yarn, polyolefin yarn, and aramid yarn. The method of claim 1, The sewing unit is an air bag cushion that is bonded by at least one sewing method selected from the group consisting of a single lock, a double lock, a single chain, and a double chain. The method of claim 1, The sewing unit is airbag cushion that is stitched and joined so that the number of sweat is 20 to 80 ea / 100mm. The method of claim 1, The sewing thread airbag cushion having a total fineness of 210 to 1260 denier. The method of claim 1, The sewing unit air bag cushion 100 ~ 400 kgf / inch of the bark strength measured by the method of the American Society for Testing and Materials Standard ASTM D 1683. The method of claim 1, The sewing unit is an airbag cushion having an elongation of 15% to 80% measured by the method of the American Society for Testing and Materials, ASTM D 1683. The method of claim 1, Airbag cushion with a maximum pressure of 100 kPa or more at initial airbag cushion inflation when 25 bar instantaneous pressure is applied to the airbag cushion. An airbag system comprising the airbag cushion according to claim 1. The method of claim 10, Wherein said airbag is a front airbag, a side airbag, or a curtain airbag.

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