KR101621079B1 - Polyester fabrics for airbag and preparation method thereof - Google Patents

Abstract

The present invention relates to a fabric for an air bag comprising a polyester yarn, and more particularly to a fabric for airbags comprising polyester yarn, which has a tensile strength (T ₁ ) of 200 kgf / inch or more as measured by the American Society for Testing and Materials Association standard ASTM D 5034, D 2261 tear strength as measured by a TONGUE method also (T ₂₎ is 14 and the kgf or more, the tensile strength (T ₁₎ and a tear strength ratio _{(T 2) (T 1 /} T 2) is 10.5 to 24 of the air bag And a vehicle air bag including the polyester fabric.
The airbag fabric of the present invention is excellent in mechanical properties such as toughness and tear strength by using low-modulus, high-strength, and high-elongation polyester yarn, and at the same time provides excellent retention, shape stability and air- Thereby minimizing the impact on the passengers and safely protecting the passengers.

Description

[0001] POLYESTER FABRICS FOR AIRBAG AND PREPARATION METHOD THEREOF [0002]

More particularly, the present invention relates to a polyester fabric for an airbag having an excellent toughness and energy absorbing performance, including polyester yarn of low modulus and high strength and high elongation, To an airbag for a vehicle.

Generally, an air bag is used to detect a collision shock applied to a vehicle at the time of a frontal collision at a speed of about 40 km / h or more at a speed of about 40 km / h by a shock sensor, To expand the inflator, thereby protecting the driver and the passenger.

The required items for the airbag are low air permeability for smooth deployment in the event of collision, high strength for preventing damage and rupture of the airbag itself, high heat resistance and flexibility for reducing passenger impact.

Particularly, the airbag used in an automobile is manufactured in a certain shape, and then folded to minimize the volume of the airbag. The folded state of the airbag is maintained when the inflator is operated, So that it can be expanded and deployed.

Therefore, in order to effectively maintain the folding property and the package property of the airbag when the vehicle is mounted, to prevent damage and rupture of the airbag itself, to exhibit excellent airbag cushion deployment performance and to minimize the impact on passengers, Along with flexibility to reduce folding and impact on passengers is very important. However, there has been no proposal of a fabric for an air bag which can maintain sufficient air-blocking effect and flexibility at the same time for the safety of passengers, can withstand the impact of the air bag, and can be effectively installed in the vehicle.

Conventionally, polyamide fibers such as nylon 66 have been used as materials for yarns for airbags. However, nylon 66 is superior in impact resistance, but is inferior to polyester fiber in wet heat resistance, light resistance and form stability, and has a high raw material cost.

On the other hand, Japanese Patent Application Laid-Open No. 04-214437 proposes the use of a polyester fiber in which such drawbacks are alleviated. However, when the conventional polyester yarn is used to manufacture an air bag, it is difficult to accommodate the air bag in a narrow space due to its high stiffness, and excessive heat shrinkage due to heat treatment at a high temperature due to high elasticity and low elongation And has been limited in maintaining sufficient mechanical properties and development performance under severe conditions of high temperature and high humidity.

Accordingly, it is an object of the present invention to provide a textile fabric which is excellent in mechanical properties and air-blocking effect suitable for use as a fabric for airbags for a vehicle, has flexibility for reducing an impact applied to a passenger, Research on development is needed.

An object of the present invention is to provide a polyester fabric for an airbag that secures excellent mechanical properties, flexibility and retention for use in a fabric for airbags, and maintains sufficient performance under harsh conditions of high temperature and high humidity.

The present invention also aims to provide a method for producing a polyester fabric for the airbag.

The present invention also provides a vehicle airbag comprising the polyester fabric for the airbag.

The present invention relates to a steel sheet having a tensile strength (T ₁ ) of 200 kgf / inch or more as measured by the American Society for Testing and Materials (ASTM D 5034) standard and a tear strength (T ₂ ) measured by the American Society for Testing and Materials ASTM D 2261 TONGUE (T ₁ / T ₂ ) of the tensile strength (T ₁ ) to the tear strength (T ₂ ) is 14 kgf or more, and the polyester fabric for airbags is as shown in the following formula (1).

[Equation 1]

10.5? T ₁ / T ₂ ? 24

In the formula,

T ₁ is the tensile strength (kgf / inch) of the polyester fabric in the oblique direction,

T ₂ is the tear strength (kgf) in the oblique direction of the polyester fabric.

The present invention also relates to a method for manufacturing an airbag comprising the steps of weaving a raw material for an airbag with a polyester yarn having a fineness of 400 to 650 denier, refining the raw paper for the airbag weaving, and tentering the refined fabric A method for producing a polyester fabric is provided.

The present invention also provides a vehicle airbag comprising the polyester fabric for the airbag.

Hereinafter, a polyester fabric for an air bag according to a specific embodiment of the present invention, a method of manufacturing the same, and a vehicle air bag including the same will be described in detail. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined by the appended claims.

In addition, throughout this specification, "comprising" or "containing ", unless specifically stated, refers to including any and all components (or components) Can not be interpreted as excluding.

In the present invention, the fabric for the airbag refers to a fabric or a nonwoven fabric used for manufacturing an airbag for an automobile. The fabric for a normal airbag is a nylon 6 flat fabric or nylon 6 nonwoven fabric woven by a rapier loom, The fabric for the airbag of the present invention is characterized by its excellent shape stability, basic properties such as air permeability and lubrication by using polyester yarn.

However, in order to apply polyester as an airbag yarn in place of conventional polyamide fibers such as nylon 66, there is a problem in that the polyester yarn has a high modulus and a low degree of folding due to the lubrication and a high degree of high temperature and high humidity Under these conditions, it is necessary to be able to overcome the deterioration of the physical properties and the deterioration of the expansion performance.

Polyesters have a structure with high stiffness compared to nylon in molecular structure and thus have high modulus characteristics. As a result, when used as a fabric for an airbag and mounted on an automobile, the packing is remarkably deteriorated. In addition, a carboxyl end group (hereinafter referred to as "CEG") in a polyester molecular chain attacks an ester bond under high temperature and high humidity conditions to cause molecular chain cleavage, .

Accordingly, the present invention optimizes the physical properties such as tensile strength and tearing strength of a fabric by using a low-modulus, high-strength and high-elongation polyester yarn, thereby achieving excellent mechanical properties and air- It is possible to obtain an improved physical property improvement effect as a fabric for an airbag.

Particularly, as a result of experiments conducted by the inventors of the present invention, it has been found that by fabricating a fabric for airbags with a polyester fabric having predetermined characteristics, it has improved folding ability, form stability and air blocking effect, it is possible to maintain excellent mechanical properties, prevention of air leakage, and airtightness under severe conditions such as packing and high temperature and high humidity.

According to one embodiment of the invention, there is thus provided a polyester fabric having certain properties. Such a polyester fabric, that is, a polyester fabric for an airbag, has a tensile strength (T ₁ ) of 200 kgf / inch or more as measured by the American Society for Testing and Materials Association standard ASTM D 5034 and is measured by the American Society for Testing and Materials Association standard ASTM D 2261 TONGUE The measured tear strength (T ₂ ) is not less than 14 kgf and the ratio (T ₁ / T ₂ ) of the tensile strength (T ₁ ) to tear strength (T ₂ ) can be as shown in the following equation .

[Equation 1]

10.5? T ₁ / T ₂ ? 24

In the formula,

T ₁ is the tensile strength (kgf / inch) of the polyester fabric in the oblique direction,

T ₂ is the tear strength (kgf) in the oblique direction of the polyester fabric.

As a result of experiments conducted by the inventors of the present invention, it has been found that, by using a polyester yarn having high modulus and high modulus and low modulus as compared with conventional polyester yarns, the tensile strength and tearing strength of the fabric are optimized, It has been found that fabric for airbags that can absorb and withstand can be provided. Particularly, when the polyester fabric for airbags has a tensile strength (T ₁ ) of 200 kgf / inch or more, or 200 to 490 kgf / inch, preferably 210 kgf / inch or more, or 210 (T ₂ ) of 14 kgf or more, or 14 to 30 kgf, preferably 18 kgf or more, or 18 to 28 kgf / inch, measured by ASTM D 2261 TONGUE, kgf. < / RTI > The ratio (T ₁ / T ₂ ) of the tensile strength (T ₁ ) and the tearing strength (T ₂ ) may be 10.5 to 24, preferably 11 to 23 . Through the optimization of the tensile strength and the tear strength, the airbag fabric has improved toughness and energy absorption performance compared to conventional PET fabrics, solves high stiffness problems, and has excellent foldability, flexibility, And storage stability.

In the present invention, in order to effectively absorb the impact energy generated momentarily during operation of the airbag, the tensile strength and the tearing strength of the fabric can be adjusted to the optimum range at the same time, thereby improving the mechanical properties and folding property of the final fabric. It is necessary to optimize both the tensile strength and the tear strength together in order for the fabric to safely absorb the instantaneous impact energy of the exhaust gas generated by the explosive explosion in the airbag in the early stage, and at the same time to achieve effective expansion and good foldability. At this time, in the present invention, it is necessary that the tensile strength and tear strength of the fabric satisfy the above-mentioned range.

In particular, the tensile strength of the fabric is represented by the formula 1 with T _1, that is, maintaining the tensile strength of the inclination direction of the polyester fabric is less than 200 kgf / inch, and at the same time, the fabric tear strength of which is represented by the formula 1 to T ₂ , That is, by maintaining the tear strength in the oblique direction of the polyester fabric at 14 kgf or more, it is possible to secure high toughness and sufficient energy absorption performance in deploying the airbag. Failure to maintain the tensile strength and tear strength of the fabric above the minimum value may cause damage to the passenger due to the failure to protect the passenger due to the tearing of the fabric during deployment of the airbag.

Further, the ratio (T ₁ / T ₂ ) of the tear strength to the tensile strength of the fabric is 10.5 or more as shown in the above-mentioned formula (1), because the inflator pressure of the high- It is preferable that the airbag cushion assembly is not more than 24 in view of the retention of the airbag cushion assembly. When the ratio of the tear strength to the tensile strength of the fabric (T ₁ / T ₂ ) does not satisfy the above range, the tensile strength is too low and the tear strength is very high, or the tensile strength is very high The tear strength becomes too low, which is undesirable. In particular, when the ratio (T ₁ / T ₂ ) of the tear strength to the tensile strength of the fabric is less than 10.5, the tensile strength is too low, the tear strength is too high, the fabric density is low, It is possible to effectively absorb the high-temperature and high-pressure gas energy at the time of deployment of the airbag. On the other hand, when the ratio (T ₁ / T ₂ ) of the tear strength to the tensile strength of the fabric exceeds 24, the tensile strength is too high and the tear strength is too low, so that the density of the fabric increases, But it is difficult to apply as an actual airbag cushion because the fabric is very stiff and the fabric weight is high, so that the retractability and folding property are remarkably reduced when the automobile is mounted.

The polyester fabric according to one embodiment of the present invention has a tear resistance (E ₁ ) in an oblique direction measured at room temperature by the American Society for Testing and Materials Association (ASTM D 6479) method of 300 N or more, (E ₂ ) measured at room temperature is not less than 300 N, and the sum of the warp resistance (E ₁ ) in the warp direction and the resistance (E ₂ ) in the warp direction is as shown in the following formula Can,

[Equation 2]

600? E ₁ + E ₂ ? 1,970

In the formula,

E ₁ is the warp resistance (N) in the warp direction of the polyester fabric measured at room temperature,

E ₂ is the weft direction resistance (N) of polyester fabric measured at room temperature.

As described above, the polyester fabric of the present invention can control the mechanical properties of the final fabric, the energy for the high-temperature and high-pressure gas, and the like, by adjusting the edge comb resistance (E ₁ , E ₂ ) Absorbing performance, folding ability, and the like. In particular, the fabric may have a tear strength (E ₁ ) in an oblique direction measured at room temperature of 300 N or more, or 300 to 1000 N, preferably 320 N or 320 to 970 N, (E ₂ ) of 300 N or more, or 300 to 970 N, preferably 320 N or more, or 320 to 950 N, The sum of the tipping resistance in the warp direction and the tipping resistance in the weft direction can be 600 to 1,950 N, preferably 640 to 1,920 N, as shown in the above-mentioned equation (1). In this case, when the treading force of the fabric in the warp direction and the weft direction is less than 300 N, the fabric strength at the airbag cushion sewing area at the time of deployment of the airbag is drastically deteriorated so that pinhole and pinhole phenomenon Which may be undesirable. At the same time, when the sum of the warp resistance (E ₁ ) and the warp resistance (E ₂ ) of warp direction of the fabric satisfies the above-mentioned range, the warp knot squeeze phenomenon when the airbag is inflated is restrainted So that the internal pressure of the airbag is sufficiently suppressed.

In order to ensure airtightness at the polyester fabric, the elongation is minimized by enduring the tensile force by high-pressure air or the like. At the same time, in order to secure sufficient mechanical properties in the operation of the air bag, energy absorption performance is maximized at high- very important. Accordingly, the fabric is optimized to have a cover factor of 1,800 to 2,460, preferably 1,880 to 2,360, by the following formula 3, thereby improving airtightness and energy absorption performance at the time of deploying the airbag.

[Equation 3]

Cover Factor (CF)

When the cover factor of the fabric is less than 1,800, there is a problem that the air is easily discharged to the outside during the air inflation. When the cover factor of the fabric is more than 2,460, the air bag cushion It can fall.

The polyester fabric for an airbag of the present invention has a toughness of 3.5 kJ / m 3 or more, or 3.5 kJ / m 3 to 6.0 kJ / m 3, preferably 3.8 kJ / m 3 or 3.8 kJ / 5.7 kJ / m < 3 >.

[Equation 4]

In the above equation 4,

F represents the load applied when the length of the polyester fabric is increased by dl,

dl represents the length of the polyester fabric increased in length.

The polyester fabric can absorb and sustain the energy of the high-temperature and high-pressure gas effectively as it meets the high level of toughness (wave single) compared to the conventional fabrics. Here, the term "toughness" refers to the energy consumed until the fabric is cut off by the tensile force as represented by the above-mentioned formula (1), which means resistance of the fiber to abrupt impact. When the length of a certain fiber is increased from 1 to l + dl in the load F, the work becomes F · dl at this time, so that the toughness required to cut the fiber is given by the above equation (4). That is, this toughness indicates the cross-sectional area of the steel-elongated curve of the yarn and the fabric (see Fig. 1). The higher the strength and elongation value of the yarn used in the fabric, the higher the toughness expressed in the fabric. Particularly, when the toughness of the fabric for airbags is lowered, the resistance of the fabric, which can sufficiently absorb the momentary deployment impact of the inflator having a high temperature and a high pressure during deployment of the airbag, is lowered. Accordingly, when the toughness of the fabric in the present invention is less than 3.5 kJ / m < 3 >, for example, it may be difficult to apply the fabric to the airbag.

In general, polyester has a structure with higher stiffness than nylon in molecular structure. Therefore, it exhibits high modulus characteristic, and folding property and packing are remarkably lowered when used as a fabric for airbag, It becomes difficult to store in a space. Accordingly, the present invention can stably maintain the toughness and the tear strength of a fabric while significantly reducing the stiffness of the fabric by using a polyester yarn having high strength and low modulus. The fabric for an airbag of the present invention may exhibit a lubrication of less than or equal to 2.5 kgf, preferably less than or equal to 2.2 kgf, or 0.5 to 2.2 kgf according to the American Society for Testing and Materials ASTM D 4032 method. As the stiffness of the fabric is significantly lowered compared to conventional polyester fabrics, the fabric for the airbag of the present invention can exhibit excellent folding and flexibility, and improved retention for airbag mounting.

The fabric of the present invention preferably maintains the above-mentioned lubrication range in order to be used for an air bag. If the lubrication degree is too low, it may fail to provide a sufficient protective support function when the air bag inflates and deploys. So that the retractability may be deteriorated. Further, in order to prevent the storage property from being lowered by making it difficult to fold because it becomes too hard, and to prevent discoloration of the fabric, the above-mentioned degree of lapping is preferably 2.5 kgf or less, particularly preferably 1.5 kgf or less in the case of less than 460 denier , And even when it is 550 denier or more, it is preferably 2.5 kgf or less.

The static air permeability of the airbag fabric according to the American Society for Testing and Materials Association standard ASTM D 737 method is 2.5 cfm or less, or 0.6 to 2.5 cfm or less, preferably 2.2 cfm or less, or 0.1 cfm or less when? P is 125 pa, To 2.2 cfm and may be 14 cfm or less, or 4 to 14 cfm, preferably 12 cfm or 1 to 12 cfm when DELTA P is 500 pa. The dynamic air permeability according to the American Society for Testing and Materials Standards ASTM D 6476 method is less than 1,700 mm / s, preferably 1,600 mm / s or 400 to 1,600 mm / s, more preferably 1,400 mm / s or 100 To 1,400 mm / s. In this case, the static air permeability refers to the amount of air passing through the fabric when a certain pressure is applied to the fabric for the airbag, and the lower the density of the fabric, the smaller the Denier per filament and the higher the density of the fabric. Also, the dynamic air permeability refers to the degree of air permeation to the fabric when an average instantaneous differential pressure of 30 to 70 kPa is applied. As the static fineness of the yarn is small and the density of the fabric is high, Lt; / RTI >

Particularly, the air permeability of the airbag fabric can be significantly lowered by including the rubber component coating layer in the fabric, and air permeability close to 0 cfm can be ensured. However, when such a rubber component coating is performed, the coating fabric for an airbag of the present invention has a static air permeability according to the American Society for Testing and Materials Association standard ASTM D 737 of less than or equal to 0.1 cfm when? P is 125 pa , Preferably 0.05 cfm or less, or 0 to 0.05 cfm, and may be 0.3 cfm or less, or 0 to 0.3 cfm, preferably 0.1 cfm or less, or 0 to 0.1 cfm when? P is 500 pa.

Here, the airbag fabric of the present invention maintains the airtightness of the airbag fabric when the uncoated fabric and the coated fabric respectively exceed the upper limit value of the static air permeability range or the upper limit value of the dynamic air permeability range, respectively Which may be undesirable.

The fabric for the airbag according to the present invention may have a cut elongation of 25% to 60%, preferably 30% to 50%, measured at room temperature by the American Society for Testing and Materials ASTM D 5034 method. In view of the toughness of the fabric, the cut elongation is preferably 25% or more, and in terms of the tear strength, the cut elongation is preferably not more than 60%.

In addition, the fabric may have a shrinkage ratio in the warp direction and the weft direction measured by the method of ASTM D 1776 of 1.0% or less, preferably 0.8% or less. In view of the shape stability of the fabric, it is most preferable that the fabric shrinkage ratio in the warp direction and the warp direction do not exceed 1.0%.

Meanwhile, in order to ensure excellent performance as a raw material for an airbag, it is preferable to perform various aging to maintain improved physical properties. At this time, the aging may include at least one selected from the group consisting of heat aging, cycle aging, and humidity aging. Preferably, the three aging is performed. It is possible to maintain the strength and physical properties to an excellent degree.

The heat aging may be performed by heat treating the raw material at a high temperature, preferably at a temperature of 110 to 130 ° C. for 300 hours or 300 to 500 hours. Cycle aging is performed by repeatedly performing high temperature aging, high humidity aging and low temperature aging on the fabric, preferably aging for 12 to 48 hours at a temperature of 30 to 45 DEG C and a relative humidity of 93 to 97% RH. , Aging at 70 to 120 캜 for 12 to 48 hours, and aging at -10 to -45 캜 for 12 to 48 hours may be repeated two to five times. Humidity aging consists of aging the fabric under hot and humid conditions, preferably aging at a temperature of 60 to 90 DEG C and a relative humidity of 93 to 97% RH for 300 hours or 300 to 500 hours .

In particular, the airbag fabric of the present invention has a strength retention ratio of 80% or more, preferably 85% or more, more preferably 90% or more, calculated as% of the strength measured after aging at room temperature under the above conditions . The strength and the strength retention rate of the fabric are maintained in an excellent range even after prolonged aging under severe conditions such as high temperature and high humidity, so that excellent performance as an airbag fabric can be exhibited.

On the other hand, according to another embodiment of the invention, polyester fabrics made from polyester yarns having certain properties are provided. Since the polyester yarn used for such an airbag fabric has to maintain a low fineness and high strength, the fineness can be 400 to 650 denier.

Particularly, the present invention uses polyester yarn having high modulus and high elongation and low modulus, not polyester yarn having high modulus of low tensile modulus and high energy absorbency at inflation of airbag, It is possible to provide a polyester fabric for airbags having excellent shape stability, air barrier properties and excellent folding ability.

A polyester yarn made of a polyester chip having an intrinsic viscosity of 1.05 to 1.80 dl / g, preferably 1.10 to 1.55 dl / g may be used as the raw fabric of the present invention. It is preferable that the polyester yarn is made of a polyester chip having an intrinsic viscosity of 1.05 dl / g or more in order to maintain excellent physical properties even after aging under the harsh conditions of room temperature, high temperature and high humidity. Further, in order to exhibit low shrinkage characteristics, it is preferable to include a polyester yarn made of a polyester chip having an intrinsic viscosity of 1.80 dl / g or less, preferably 1.60 dl / g or less.

The polyester yarn preferably has a shrinkage stress at 150 DEG C of from 0.005 to 0.075 g / d, which corresponds to the laminate coating temperature of a typical coated fabric, and the shrinkage stress at 200 DEG C, which corresponds to the sol coating temperature of a typical coated fabric Preferably 0.005 to 0.075 g / d. That is, when the shrinkage stress at 150 ° C and 200 ° C is 0.005 g / d or more, the sagging of the fabric due to heat during the coating process can be prevented. When the shrinkage stress is less than 0.075 g / d, The relaxation stress can be relaxed.

In addition, it is preferable that the polyester yarn has a contraction ratio of less than 6.5% at 177 ° C in order to maintain the weaving pattern by imparting a tensile strength higher than a certain level during the heat treatment during the coating process and consequently to prevent deformation of the fabric for the airbag.

The shrinkage stress defined in the present invention is based on the value measured under a fixed load of 0.10 g / d, and the shrinkage rate is based on a value measured under a fixed load of 0.01 g / d.

The polyester yarn is preferably a polyethylene terephthalate (PET) yarn among ordinary polyesters, more preferably a PET yarn containing PET in an amount of 90 mol% or more.

Further, the polyester raw material may have a single fiber fineness of 2.5 to 6.8 DPF, preferably 2.75 to 4.55 DPF. The single yarn fineness of the yarn is preferably 2.5 DPF or more in terms of the weaving performance and the yarn manufacturing (spinning) performance of the airbag fabric, and is preferably 6.8 DPF or less in terms of the air barrier property and the storage capacity of the airbag fabric. As the number of filaments of the yarn increases, the softness of the filament may be increased. However, the number of filaments may be in the range of 96 to 160 since radioactivity may be too high.

In particular, the fabric for the airbag of the present invention has a Young's modulus measured by the method of ASTM D 885 of the American Society for Testing and Materials, 60 to 100 g / de at 1% elongation, that is, at 1% elongation, Preferably 75 to 95 g / de, and at 2% elongation, i.e. 20 to 60 g / de, preferably 22 to 55 g / de at 2% stretched point. As a conventional general industrial yarn, the polyester yarn has a Young's modulus of 110 g / de at a 1% elongation point and a modulus of 80 g / de at a 2% elongation point , The polyester yarn having a remarkably low modulus can be used in the present invention to produce a fabric for airbags.

In this case, the modulus of the polyester yarn is a physical property value of the elastic modulus obtained from the elastic section slope of the stress-strain diagram obtained in the tensile test. When the object is stretched from both sides, the elastic modulus . ≪ / RTI > If the modulus of the fiber is high, the elasticity is good, but the stiffness of the fabric can be deteriorated. When the modulus is too low, the liner degree of the fabric is good but the elastic recovery force is low and the toughness of the fabric may be deteriorated. Thus, the airbag fabric made from polyester yarn having an initial modulus lower than that of the prior art solves the problem of high stiffness of conventional polyester fabric, and exhibits excellent folding, flexibility, and retention .

The toughness of the polyester yarn can be measured using a polyester yarn in place of the polyester fabric in the above formula 4. The toughness of the yarn thus measured is 70 to 95 J / m 3, preferably 75 J / M < 3 > to 90 J / m < 3 >. Particularly, in the present invention, since a specific polyester yarn satisfying a high level of toughness (wave single) is used as compared with a conventional polyester yarn, the fabric for an air bag which can effectively absorb and withstand the energy of a high- Can be provided.

The polyester yarn has a tensile strength of 8.3 g / d or more, preferably 8.3 to 9.5 g / d, more preferably 8.6 g / d to 9.3 g / d, a cut elongation of 14% to 24% , Preferably from 17% to 22%. In addition, the raw yarn may exhibit a dry heat shrinkage of 6.5% or less or 1.0% to 6.5%, preferably 5.0% or 1.2% to 5.0%.

As already described above, the polyester fabric of the present invention can exert excellent performance in producing a fabric for an airbag using a polyester yarn having an intrinsic viscosity, an initial modulus and an elongation range in an optimum range.

The polyester raw material may be prepared by melt spinning a PET polymer to prepare an undrawn yarn and stretching the undrawn yarn, and the specific conditions and the process of each of these steps are directly or indirectly related to the physical properties of the polyester yarn The polyester yarn which can be effectively used for the airbag fabric of the present invention can be produced.

 In a more preferred embodiment, the high modulus, high modulus, low modulus polyester yarn is obtained from a high viscosity polymer comprising polyethylene terephthalate in an amount of at least 70 mole% and an intrinsic viscosity of at least 1.05 dl / g, Melt spinning at a low temperature to produce a polyester undrawn yarn, and stretching the polyester undrawn yarn under a draw ratio condition of 5.0 to 6.0. At this time, by melt-spinning under a low temperature condition, more preferably at a low temperature / low speed condition, using a high viscosity PET polymer having a low carboxyl end group (CEG) content, preferably 30 meq / kg or less, Deterioration and increase of CEG content can be suppressed to the maximum, and high mechanical properties of the yarn can be maintained while maintaining high elongation characteristics. Further, by performing stretching under an optimized stretching ratio condition of 5.0 to 6.0 in the subsequent stretching step, polyester yarn having high modulus and high elongation and low modulus is produced by suppressing the decrease of the elongation of the yarn as much as possible, Can be applied.

When the melt spinning process is carried out at a high temperature, for example, when it is carried out at a temperature higher than 300 ° C, a large amount of pyrolysis of the PET polymer occurs, thereby decreasing intrinsic viscosity and increasing CEG content. An increase in orientation may result in a decrease in elongation and an increase in modulus, which may result in deterioration of the overall properties due to surface damage of the yarn, which is undesirable. In addition, if the stretching process is performed under a stretching ratio of too high, for example, more than 6.0, the stretch yarn becomes excessively stretched to cut or wrinkle the stretch yarn, and the polyester yarn produced by the above- It is difficult to exhibit desirable physical properties for use as a fabric for fabrics. If the stretching process is carried out under a relatively low stretching ratio, the fiber orientation degree is low and the strength of the polyester yarn produced therefrom may be lowered in some degree. Therefore, it is preferable to perform the stretching process under the stretching ratio of 5.0 or more, It is possible to produce polyester yarn of high strength, high elongation and low modulus.

On the other hand, in terms of producing a polyester yarn having a high elongation and a high elongation at low modulus under such a high stretching ratio condition, the conditions of the subsequent steps, for example, the relaxation ratio, %. ≪ / RTI >

Through the above process optimization, polyester yarn for airbags having a low initial modulus and high strength and high elongation can be secured. In addition, through optimization of such melt spinning and stretching processes, it is possible to minimize the carboxyl end groups (CEGs) that are present as acids under high humidity conditions and cause the basic molecular chain breakage of the polyester yarn. Therefore, such a polyester yarn can be suitably applied to a fabric for an air bag which exhibits a low initial modulus and a high elongation range at the same time, and has excellent mechanical properties and retention properties, shape stability, impact resistance and air barrier effect.

On the other hand, according to another embodiment of the present invention, the fabric for airbags of the present invention may preferably further include a rubber component coating layer coated or laminated on the surface. Examples of the rubber component include at least one selected from the group consisting of powder silicone, liquid silicone, polyurethane, chloroprene rubber, neoprene rubber, and emulsion silicone resin. Is not limited to the above-mentioned materials. However, silicon coating is preferable in terms of environment friendliness and mechanical properties.

The coating amount of the rubber component coating layer per unit area may be 20 to 200 g / m ² , preferably 20 to 100 g / m ² . In particular, in the case of a fabric for a side curtain airbag of OPW (One Piece Woven) type, the coating amount is preferably 30 g / m ² to 95 g / m ² , and in the case of plain weave for airbag, m ² to 50 g / m ² is preferable.

Further, according to another embodiment of the present invention, there is provided a method of manufacturing a fabric for an air bag using polyester yarn. The method for fabricating an airbag fabric according to the present invention includes the steps of weaving a raw material for an airbag using polyester yarn having a fineness of 400 to 650 denier, refining the raw material for the airbag weaving, And the step

In the present invention, the polyester yarn can be produced as a final airbag fabric through a conventional weaving method, refining and tentering processes. At this time, the weaving form of the fabric is not limited to a specific form, and both plain weave type and OPW (One Piece Woven) type weaving type are preferable.

In particular, the airbag fabric of the present invention can be manufactured by beaming, weaving, refining, and tentering processes using the polyester yarn as weft and warp yarns. The fabric may be manufactured using a conventional weaving machine, and is not limited to the use of any specific loom. However, plain weave fabrics may be manufactured using a Rapier Loom, an Air Jet Loom, or a Water Jet Loom, and the OPW type fabric may be manufactured using Jacquard looms Loom. ≪ / RTI >

However, the present invention uses a polyester yarn having a low shrinkage ratio and a high strength and high elongation as compared with the conventional polyester yarn, so that the heat treatment can be performed at a higher temperature than the conventional polyester yarn. That is, in the present invention, after the woven fabric is refined and tentered, the tentered fabric is coated with a rubber component and dried, and then a vulcanization temperature of 140 to 210 ° C, preferably 160 to 200 ° C, and most preferably, Is performed at a temperature of 175-195 캜, and the vulcanization temperature should be 140 캜 or higher in terms of maintaining the mechanical properties such as tear strength of the fabric and 210 캜 or lower in terms of the lubrication. Particularly, the heat treatment process can be performed in multiple stages. For example, after the first heat treatment process is performed at 150 to 170 ° C, the second heat treatment process is performed at 170 to 190 ° C, A car heat treatment process can be performed.

Thus, when the polyester fabric of the present invention is produced through a high-temperature heat treatment process, it is possible to improve the shape stability, air-blocking effect, laminating property and tearing strength improvement by improving the material density by the low shrinkage characteristic of the polyester yarn itself The effect can be given to a larger extent.

 In addition, the curing time at the vulcanization temperature may be in the range of 30 to 120 seconds, preferably 35 to 100 seconds, and most preferably 40 to 90 seconds. When the curing time is less than 30 seconds, the curing of the coating layer by the rubber component is not effectively performed, and the mechanical properties of the fabric are lowered to peel off the coating, and when the curing time exceeds 120 seconds There is a problem that the degree of laminating and finishing of the final fabric is increased and the foldability is lowered.

The airbag fabric of the present invention can be coated on one side or both sides of the fabric with the rubber component as described above and the coating layer of the rubber component can be applied by a knife coat method, a doctor blade method, or a spray coating method However, this is also not limited to the above-mentioned method.

The coated airbag fabric can be manufactured in the form of an airbag cushion having a certain shape while being cut and sewed. The airbag is not limited to a particular type and can be manufactured in a general form.

On the other hand, according to another embodiment of the invention, there is provided a vehicle airbag comprising the above-described polyester fabric. Also provided is an airbag system comprising the airbag described above, wherein the airbag system may comprise conventional equipment well known to those skilled in the art.

The airbag can be broadly divided into a frontal airbag and a side curtain airbag. The frontal airbag includes a driver's seat, a passenger's seat, a side protection, a knee protection, an ankle protection, and a pedestrian protection airbag. The side curtain type airbag protects the passenger in the event of a side collision or an overturning accident. Therefore, the airbag of the present invention includes both the front airbag and the side 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.

INDUSTRIAL APPLICABILITY According to the present invention, there is provided a polyester fabric for an air bag excellent in energy absorbing performance and the like when the air bag is deployed, and a vehicle air bag obtained using the same.

Such an airbag fabric not only achieves excellent shape stability, mechanical properties, and air blocking effect by minimizing heat shrinkage through a high temperature heat treatment process using low modulus, high strength, and high elongation polyester yarn, Excellent folding ability and flexibility can be ensured, thereby remarkably improving the retractability of the vehicle when mounted, and at the same time minimizing the impact on passengers, thereby safely protecting the occupant.

Therefore, the polyester fabric of the present invention can be very advantageously used for the manufacture of air bags for automobiles.

Fig. 1 shows an example of a steel-elongation curve of a general fiber. The area of this steel-elongation curve can be defined as toughness (wave single, J / m < 3 >).
Fig. 2 shows a steel-elongation curve of a polyester fabric according to Example 1 of the present invention.
3 shows a steel-elongation curve of a polyester fabric according to Comparative Example 3 of the present invention.

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  1-5

A polyester yarn having a predetermined intrinsic viscosity is manufactured through a melt spinning machine in one step, and then the yarn is used to weave the raw fabric for an airbag through a rapier loom, and after refining and tentering processes, And a liquid silicone rubber (LSR) resin was coated on the fabric by a knife over roll coating method to prepare a silicone-coated fabric.

At this time, the intrinsic viscosity, CEG content, melt spinning temperature, stretching ratio, physical properties such as modulus and tensile strength, intrinsic viscosity and weft density of fabric, weaving density , The heat treatment temperature, the rubber component, and the amount of the resin coating were as shown in Table 1, and the remaining conditions were in accordance with the usual conditions for producing the polyester fabric for airbags.

division Example 1 Example 2 Example 3 Example 4 Example 5 PET content (mol%) 100 100 100 100 100 Intrinsic viscosity (dl / g) of PET chip 1.14 1.22 1.40 1.22 1.40 The CEG (meq / kg) 30 27 24 27 24 Radiation temperature (℃) 293 295 295 297 297 Stretching cost 5.95 6.03 6.10 6.03 6.10 Intrinsic viscosity of yarn (dl / g) 0.95 1.02 1.08 1.02 1.08 Stiffness of Yarn
(Toughness, J / m 3) 79 82 86 82 86 Modulus of yarn
(At 1% of elongation, g / de) 80 77 75 77 75 Modulus of yarn
(At 2% of elongation, g / de) 32 29.8 26.8 29.8 26.8 Tensile strength of yarn (g / de) 8.4 8.8 9.2 8.8 9.2 Cutting elongation of yarn (%) 17 18 20 18 20 Dry heat shrinkage (%) 2.7 2.2 1.2 2.2 1.2 Single yarn fineness (DPF) 3.82 3.23 2.92 3.23 2.92 Total fineness (de) 420 420 420 420 420 Number of filaments 110 130 144 130 144 Weaving density
(Warp x weft) 49x49 49x49 49x49 57x57 57x57 Weaving type Plain weave Plain weave Plain weave Plain weave Plain weave Heat treatment / vulcanization temperature (캜) Primary 185 185 185 185 185 Secondary 185 185 185 185 185 Rubber component Liquid silicone Liquid silicone Liquid silicone Liquid silicone Liquid silicone Amount of rubber coating (g / m ² ) 25 25 25 25 25

The properties of the polyester fabric prepared according to Examples 1 to 5 were measured by the following methods, and the measured properties are summarized in Table 2 below.

(a) Tensile strength and cutting elongation

The specimens were cut with uncoated fabric before coating, fixed to the lower clamp of the tensile strength measuring device according to the American Society for Testing and Materials (ASTM D 5034), and the tensile strength at break of the airbag fabric specimen T ₁ ) and cut elongation were measured.

(b) Tear strength

Each of the specimens was cut into a width of 75 mm × length 200 mm using the uncoated fabric before coating, and then the upper and lower sides of the specimen were bonded to the upper and lower ends of the apparatus according to ASTM D 2261 TONGUE, (T ₂ ) relative to the uncoated fabric at a rate of 300 mm / min, based on the distance between the jaw faces of the jaw faces is 76 mm / min. Respectively.

(c) resistance to movement

(E ₁ , E ₂ ) in the warp direction and the warp direction were measured at room temperature (25 ° C) by the method according to the American Society for Testing and Materials Association standard ASTM D 6479 using the uncoated fabric before coating treatment.

(d) Cover factor (CF)

The cover factor value for the uncoated fabric was calculated by the following equation (3).

[Equation 3]

Cover Factor (CF)

(e) Toughness of the fabric

The toughness (J / m < 3 >) value was calculated by the following equation (4).

[Equation 4]

In the above equation 4,

F represents the load applied when the length of the polyester fabric is increased by dl,

dl represents the length of the polyester fabric increased in length.

At this time, the toughness of the fabric was measured with the uncoated fabric before the coating treatment.

(f) Inclination and weft direction fabric shrinkage

The fabric shrinkage in the light / weft direction was measured according to the American Society for Testing and Materials Standards ASTM D 1776. First, the specimens were cut into uncoated fabrics before coating, 20 cm in length before shrinkage in the warp and weft directions, and shrinked lengths of the specimens after heat treatment in the chamber at 149 ° C for 1 hour were measured. And the fabric shrinkage in the direction of weft {(length of shrinkage-length after shrinkage) / length of shrinkage x 100%}.

(g) Lecture

The uncoated fabric before the coating treatment was measured for its lubrication by a Circular Bend method using a lubrication measuring device according to ASTM D 4032 of the American Society for Testing and Materials. In addition, the cantilever method can be applied to the cantilever measurement method, and the cantilever can be measured by measuring the bending length of the cantilever using a cantilever measuring device, which is a test bench having a predetermined angle of inclination to bend the fabric.

(h)

The finish of the uncoated fabric before coating treatment was measured according to the American Society for Testing and Materials Standards ASTM D 1777.

(i) air permeability

Uncoated fabrics before coating treatment according to American Society for Testing and Materials Standards ASTM D 737 were allowed to stand at 20 ° C and 65% RH for at least one day and then air having a pressure of 125 pa and 500 pa respectively of 38 cm ² The amount through the circular cross section was measured and expressed as static air permeability.

The dynamic air permeability of the uncoated fabric was measured using a dynamic air permeability tester (TEXTEST FX 3350 Dynamic Air Permeability Tester) according to ASTM D 6476.

division Example 1 Example 2 Example 3 Example 4 Example 5 The tensile strength (T ₁ , kgf / inch) 220 227 234 318 338 The tear strength (T ₂ , kgf) 18 19 20 15.5 15.9 T ₁ / T ₂ 12.2 11.9 11.7 20.5 21.3 The warp resistance (E ₁ , N) 315 330 350 780 825 Weft resistance of fabric (E ₂ , N) 302 314 330 673 725 E ₁ + E ₂ 617 644 680 1453 1,550 Cover factor of fabric 2,008 2,008 2,008 2,336 2,336 Toughness of fabric
(Toughness, kJ / m3) 3.6 3.75 3.9 5.25 5.48 Cutting elongation of fabric (%) 37 37 39 35 37 Fabric Shrinkage (%) 0.7 0.6 0.5 0.5 0.4 Lecture
(kgf) slope 0.3 0.4 0.40 1.50 1.52 Weft 0.40 0.35 0.35 1.47 1.48 Fillet (mm) 295 294 295 297 297 Static air permeability
(cfm) P = 125 Pa 1.2 1.0 0.8 0.15 0.15 P = 500 Pa 9.5 9.5 9.2 2.35 2.36 Dynamic air permeability (mm / s) 650 620 600 330 330

Comparative Example  1-5

Polyester fabrics for airbags of Comparative Examples 1 to 5 were prepared in the same manner as in Examples 1 to 5 except for the conditions described in Table 3 below.

division Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 PET content (mol%) 100 100 100 100 100 Intrinsic viscosity (dl / g) of PET chip 0.75 0.80 0.85 0.80 0.85 The CEG (meq / kg) 50 47 43 47 43 Radiation temperature (℃) 293 295 297 295 297 Stretching cost 4.95 4.98 5.01 4.98 5.01 Intrinsic viscosity of yarn (dl / g) 0.60 0.62 0.64 0.62 0.64 Stiffness of Yarn
(Toughness, J / m 3) 55 58 60 55 60 Modulus of yarn
(At 1% of elongation, g / de) 115 119 125 119 125 Modulus of yarn
(At 2% of elongation, g / de) 85 91 93 91 93 Tensile strength of yarn (g / de) 6.6 6.75 6.9 6.75 6.9 Cutting elongation of yarn (%) 10 11 13 11 13 Dry heat shrinkage (%) 15.5 15 13.7 15 13.7 Single yarn fineness (DPF) 7.35 6.94 6.94 6.94 6.94 Total fineness (de) 500 500 500 500 500 Number of filaments 68 72 72 72 72 Weaving density
(Warp x weft) 45x45 45x45 45x45 50x50 50x50 Weaving type Plain weave Plain weave Plain weave Plain weave Plain weave Heat treatment / vulcanization temperature (캜) Primary 160 165 160 165 165 Secondary 160 165 160 165 165 Rubber component Liquid silicone Liquid silicone Liquid silicone Liquid silicone Liquid silicone Amount of rubber coating (g / m ² ) 25 25 25 25 25

The physical properties of the polyester fabric prepared according to Comparative Examples 1 to 5 are summarized in Table 4 below.

division Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 The tensile strength (T ₁ , kgf / inch) 168 169 171 186 187 The tear strength (T ₂ , kgf) 20.3 20.4 20.8 18.6 18.8 T ₁ / T ₂ 8.28 8.28 8.22 10 9.95 The warp resistance (E ₁ , N) 205 207 210 228 230 Weft resistance of fabric (E ₂ , N) 196 198 199 213 215 E ₁ + E ₂ 401 405 409 441 445 Cover factor of fabric 2,012 2,012 2,012 2,236 2,236 Toughness of fabric
(Toughness, kJ / m3) 1.8 1.81 1.83 2.1 2.2 Cutting elongation of fabric (%) 15 15 17 16 16 Fabric Shrinkage (%) 1.3 1.3 1.2 1.2 1.1 Lecture
(kgf) slope 2.1 1.9 1.8 2.3 2.3 Weft 2.1 1.9 1.8 2.3 2.3 Fillet (mm) 303 305 305 305 305 Static air permeability
(cfm) P = 125 Pa 3.0 3.0 3.0 2.7 2.7 P = 500 Pa 14.5 14.3 14.3 13.6 13.5 Dynamic air permeability (mm / s) 1,950 1,950 1,950 1,850 1,850

As shown in Tables 2 and 4, according to the present invention, a polyester yarn having a low tensile modulus and a low modulus of elasticity was used to adjust the ratio of the tear strength to the tensile strength, To 5 of the polyester fabric for airbags have excellent physical properties in terms of excellent mechanical properties, improved fabric shrinkage, lubrication and air permeability as compared with the fabric for airbags of Comparative Examples 1 to 5 using conventional polyester yarns.

In particular, as shown in Table 2, the polyester fabric for airbags of Examples 1 to 5 had a tensile strength (T ₁ ) of 220 to 338 kgf / inch, a tear strength (T ₂ ) of 15.5 to 20 kgf, strength (T ₁₎ and the tear strength (T ₂₎ ratio (T ₁ / T ₂₎ is by optimizing a 11.7 to 21.3, a toughness of 3.6 to 5.48 kJ / m ^3, hwaltal resistance in an oblique direction and a weft direction of the And the cover factor of the fabric is 2,008 to 2,336, respectively, and the fabric shrinkage ratio is 0.4% to 0.7%. At the same time, it can be confirmed that the polyester fabric for airbags of Examples 1 to 5 has an excellent optimum range of 0.3 to 1.52 kgf in lapping degree, and thus has superior form stability and mechanical properties as well as excellent folding property and storage property . Further, the airbag fabrics of Examples 1 to 5 were obtained by using a yarn having a high modulus and high modulus and a low modulus, and the airtightness of the uncoated fabric (at ΔP = 125 pa) was 1.2 cfm or less .

On the other hand, as shown in Table 4, it was confirmed that the airbag fabrics of Comparative Examples 1 to 5 using the polyester yarn having a low modulus of elasticity (Young's modulus) did not satisfy these characteristics . In particular, the fabric for airbags according to Comparative Examples 1 to 5 had a toughness of 1.8 to 2.2 kJ / m < ³ >, respectively, a tear resistance resistance in the warp direction and weft direction of 196 to 230 N and a fabric shrinkage of 1.1 to 1.3% . If the fabric having a significantly lowered mechanical property such as tensile strength and anti-tearing resistance is used in the airbag device, a problem may arise due to deterioration of mechanical properties such as rupture of the airbag when the airbag is deployed. In addition, it can be seen that the air permeability of the uncoated fabric according to Comparative Examples 1 to 5 is greatly increased to 2.7 to 3.0 cfm to degrade the airtightness. When the air permeability is increased, the air easily escapes during the air bag deployment, There is a problem that can not be solved.

The strength and elongation curves of the polyester fabric according to Example 1 and Comparative Example 3 are shown in Figs. 2 and 3, respectively. As shown in Fig. 2, the polyester fabric according to Example 1 exhibits high toughness and low modulus in the steel-elongation graph. On the other hand, the polyester fabric according to Comparative Example 3 shows low toughness and high modulus in the steel-elongation graph as shown in Fig.

Therefore, the polyester fabric according to the first embodiment can have an excellent capability of absorbing the high-temperature and high-pressure inflator gas energy when deploying the airbag, and excellent in terms of airbag cushion packaging performance. However, the polyester fabric according to the comparative example 3 is not sufficient in absorbing the instantaneous impact energy of the exhaust gas in the air bag deployment and deteriorated in air blocking effect performance, which is not suitable for use as an air bag fabric .

Claims (16)

A tensile strength measured by American Society for Testing and Materials specification ASTM D 5034 method (T ₁₎ is 200 kgf / an inch or more, American Society for Testing and Materials specification ASTM D 2261 TONGUE method also a tear strength measured in (T ₂₎ is 14 kgf or more and wherein the tensile strength (T ₁₎ and the tear strength (T ₂₎ ratio (T ₁ / T ₂₎ is to the same as shown in formula 1;
A polyester yarn produced from a polyester chip having an intrinsic viscosity of 1.22 to 1.80 dl / g and having a fineness of 400 to 650 denier, said polyester yarn having a modulus of Young's modulus measured by the method of ASTM D 885, Of 60 to 100 g / de at 1% elongation and 20 to 60 g / de at 2% elongation;
[Equation 1]
10.5? T ₁ / T ₂ ? 24
In the formula,
T ₁ is the tensile strength (kgf / inch) of the polyester fabric in the oblique direction,
T ₂ is the tear strength (kgf) of the polyester fabric in the oblique direction. The method according to claim 1,
(E ₁ ) of at least 300 N in an oblique direction measured at room temperature by the American Society for Testing and Materials (ASTM D 6479) standard and a resistance to warp in the weft direction measured at room temperature by the American Society for Testing and Materials (ASTM D 6479) ₂ ) is 300 N or more, and the sum of the warp resistance (E ₁ ) in the warp direction and the resistance (E ₂ ) in the weft direction is the polyester fabric for the airbag as shown in the following formula ( ₂ )
[Equation 2]
600? E ₁ + E ₂ ? 1,970
In the formula,
E ₁ is the warp resistance (N) in the warp direction of the polyester fabric measured at room temperature,
E ₂ is the weft resistance resistance (N) of polyester fabric measured at room temperature. delete The method according to claim 1,
Polyester fabric for an air bag having a cover factor of 1,800 to 2,460 as defined by the following formula 3:
[Equation 3]
Cover Factor (CF)

The method according to claim 1,
Polyester fabric for airbags having a lubrication of 1.5 kgf or less according to the American Society for Testing and Materials Standards ASTM D 4032 method. The method according to claim 1,
Static air permeability according to American Society for Testing and Materials ASTM D 737 method is less than 2.5 cfm when ΔP is 125 pa and less than 14 cfm when ΔP is 500 pa. The method according to claim 1,
Polyester fabric for airbags with a dynamic air permeability of less than 1,700 mm / s according to American Society for Testing and Materials Standards ASTM D 6476 method. The method according to claim 1,
A polyester fabric for an air bag comprising a polyester yarn having a cut elongation of 14% to 24% and a dry heat shrinkage ratio of 1.0% to 6.5%. The method according to claim 1,
A polyester fabric for an air bag comprising a polyester yarn having a Young's modulus as measured by the method of ASTM D 885 of 75 to 95 g / de at 1% elongation and 22 to 55 g / de at 2% elongation . delete The method according to claim 1,
Wherein the polyester fabric is coated with at least one rubber component selected from the group consisting of powder silicone, liquid silicone, polyurethane, chloroprene rubber, neoprene rubber, and emulsion silicone resin. 12. The method of claim 11,
And a coating amount of the rubber component per unit area of 20 to 200 g / m ² . Melt spinning a polyester chip having an intrinsic viscosity of 1.22 to 1.80 dl / g at 293 to 300 캜 to produce a polyester yarn,
The Young's modulus measured by the method of ASTM D 885 is 60 to 100 g / de at 1% elongation and 20 to 60 g / de at 2% elongation, A step of weaving the raw paper for an airbag,
Refining the raw paper for the woven airbag, and
Tentering the refined fabric
12. A method of producing a polyester fabric for airbags according to any one of claims 1, 2, 4 to 9 or 11 to 12, 14. The method of claim 13,
Wherein the heat treatment temperature in the tentering step is 140 to 210 占 폚. 12. A vehicle airbag comprising a polyester fabric for an airbag according to any one of claims 1, 2, 4 to 9 or 11 to 12. 16. The method of claim 15,
Wherein the airbag is a front airbag or a side curtain airbag.

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