KR20120000933A - Polyester fabrics for airbag and preparation method thereof - Google Patents

Abstract

PURPOSE: A polyester fabric for an airbag and a method for fabricating the same are provided to remarkably improve receivability in case of mounting in a vehicle. CONSTITUTION: A polyester fabric for an airbag contains polyester grey yarn with 200-395 denier of the fineness. The tensile strength of the polyester grey yarn is more than 95 kgf/inch in ASTM D 5034 method. The internal tearing strength of the polyester grey yarn is more than 6.5 kgf in ASTM D 2261 TONGUE method.

Description

Polyester fabric for airbag and manufacturing method thereof {POLYESTER FABRICS FOR AIRBAG AND PREPARATION METHOD THEREOF}

The present invention relates to a fabric for airbags and a method for manufacturing the same, and more particularly, to a polyester fabric for airbags having excellent toughness and energy absorption performance, including a high strength, high elongation, low fine polyester yarn, and a manufacturing method thereof. It relates to a vehicle airbag.

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 supplying and expanding, it refers to a device that protects the driver and passengers.

Items required for airbag fabrics include low breathability for smooth deployment in the event of a crash, high strength to prevent damage and rupture of the airbag itself, high heat resistance, and flexibility to reduce impact on passengers.

In particular, the airbags used in automobiles are manufactured in a certain form, and then folded in order to minimize the volume of the airbags. Allow it to expand and deploy.

Therefore, in order to effectively maintain the folding and packageability of the airbag when installing the vehicle, to prevent damage and rupture of the airbag itself, to exhibit excellent airbag cushion deployment performance, and to minimize the impact on passengers, the airbag fabric has excellent mechanical properties. In addition, foldability and flexibility to reduce the impact on passengers is very important. However, airbag fabrics that maintain excellent air blocking effect and flexibility at the same time for the safety of the passengers, sufficiently endure the impact of airbags and can be effectively mounted in a vehicle have not been proposed.

Conventionally, polyamide fibers such as nylon 66 have been used as a material for yarn for airbags. However, nylon 66 is excellent in impact resistance, but inferior in terms of moisture resistance, light resistance, shape stability and high raw material cost compared to polyester fiber.

On the other hand, Japanese Patent Application Laid-Open No. 04-214437 proposes the use of polyester fibers in which such defects are alleviated. However, in the case of manufacturing air bags using conventional polyester yarns, it is difficult to store them in a narrow space when mounted in a vehicle due to high stiffness, and excessive heat shrinkage occurs at high temperature heat treatment due to high elasticity and low elongation. In addition, there have been limitations in maintaining sufficient mechanical properties and development performance under the harsh conditions of high temperature and high humidity.

Therefore, it is a textile fabric that maintains excellent mechanical properties and air blocking effect, suitable for use as a vehicle airbag fabric, and has excellent physical properties under flexibility, storage properties, and harsh conditions of high temperature and high humidity to reduce the impact on passengers. Research on development is needed.

The present invention is to provide a polyester fabric for airbags to ensure excellent mechanical properties, flexibility, storage properties to be used in the airbag fabric, and to maintain sufficient performance under the harsh conditions of high temperature and high humidity.

The present invention also provides a method of manufacturing the polyester fabric for the airbag.

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

The present invention includes a polyester yarn having a fineness of 200 to 395 denier, the tensile strength (T ₁ ) measured by the American Society for Testing and Materials Standard ASTM D 5034 method is 95 kgf / inch or more, American Materials Testing Association standard ASTM D The tear strength (T ₂ ) measured by 2261 TONGUE method is 6.5 kgf or more, and the ratio (T ₁ / T ₂ ) of the tensile strength (T ₁ ) to the tear strength (T ₂ ) is shown in the following formula 1. It provides a polyester fabric for the same air bag.

[Calculation 1]

4.5 ≤ T ₁ / T ₂ ≤ 16.5

In the above formula,

T ₁ is the diagonal tensile strength (kgf / inch) of the polyester fabric,

T ₂ is the diagonal tear strength (kgf) of the polyester fabric.

The invention also relates to the airbag comprising weaving dough for airbags with a polyester yarn having a fineness of 200 to 395 denier, refining the dough for woven airbags, and tentering the refined fabric. It provides a method for producing a polyester fabric for.

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

Hereinafter, a polyester fabric for an airbag, a method for manufacturing the same, and a vehicle airbag 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.

In the present invention, the airbag fabric refers to a fabric or a nonwoven fabric used for the manufacture of an airbag for an automobile. As a general airbag fabric, a nylon 6 plain fabric or a nylon 6 nonwoven fabric woven with a rapier loom is used. Fabric for airbags of the present invention by using a polyester yarn has excellent characteristics such as shape stability, and basic physical properties such as air permeability, ductility.

However, in order to apply polyester as an airbag yarn instead of polyamide fibers such as conventional nylon 66, the high temperature and high humidity stiffness due to the low folding heat and low melting heat capacity due to the high modulus and stiffness of the polyester yarn Under the conditions, it should be possible to overcome the deterioration of physical properties and consequently the deterioration of development performance.

Polyester has a high stiffness structure compared to nylon in the molecular structure has a high modulus characteristics. For this reason, when used as a fabric for airbags to be mounted on a car, the packing (packing) is significantly reduced. In addition, the carboxyl end groups (hereinafter referred to as "CEG") in the polyester molecular chain attack the ester group under high temperature and high humidity conditions to cause molecular chain breakage, thereby deteriorating physical properties after aging. Becomes

Accordingly, the present invention is to optimize the physical properties such as tensile strength and tear strength of the fabric using a high-strength low-density polyester yarn, high mechanical strength and air barrier performance while significantly lowering the stiffness As it is possible to maintain, it is possible to obtain improved physical properties as an airbag fabric.

In particular, as a result of the experiments of the present inventors, by producing a fabric for the air bag with a polyester fabric having a predetermined characteristic, it shows a more improved folding properties, shape stability, and air blocking effect, when used as a fabric for the air bag, better storage performance in the vehicle mounting, etc. It has been found that even under the harsh conditions of packing and high temperature and high humidity, excellent mechanical properties, air leakage prevention, airtightness and the like can be maintained.

In accordance with one embodiment of the present invention, a polyester fabric having a predetermined characteristic is provided. These polyester fabrics, ie, polyester fabrics for airbags, comprise polyester yarns with a fineness of 200 to 395 denier, and have a tensile strength (T ₁ ) of 95 kgf / inch measured by the American Society for Testing and Materials Standard ASTM D 5034 method. Tear strength (T ₂ ) measured by the American Society for Testing and Materials Standard ASTM D 2261 TONGUE method is 6.5 kgf or more, and the ratio of the tensile strength (T ₁ ) and the tear strength (T ₂ ) (T ₁ / T ₂ ) may be as shown in Equation 1 below.

[Calculation 1]

4.5 ≤ T ₁ / T ₂ ≤ 16.5

In the above formula,

T ₁ is the diagonal tensile strength (kgf / inch) of the polyester fabric,

T ₂ is the diagonal tear strength (kgf) of the polyester fabric.

As a result of the experiments of the present inventors, by using a polyester yarn having a high modulus and a high modulus low modulus compared to a conventional polyester yarn, the energy of hot-high pressure gas is effectively It has been found that fabrics for airbags that can absorb and withstand can be provided. In particular, the tensile strength (T ₁ ) measured by the American Society for Testing and Materials Standard ASTM D 5034 method of polyester fabric for airbags is 95 kgf / inch or more or 95 to 230 kgf / inch, preferably 100 kgf / inch or more To 225 kgf / inch, the tear strength (T ₂ ) measured by the American Society for Testing and Materials Standard ASTM D 2261 TONGUE method of the fabric, the value for the uncoated fabric may be 6.5 to 22 kgf, the coated fabric Can be 20 to 45 kgf. In addition, the tensile strength (T ₁ ) and tear strength (T ₂ ), as shown in the formula 1, the ratio (T ₁ / T ₂ ) may be 4.5 to 16.5, preferably 5.0 to 15. . By optimizing the tensile strength and tear strength, the airbag fabric has improved toughness and energy absorption performance compared to the conventional PET fabric, solves high stiffness problems, and has excellent foldability, flexibility, And storage properties.

In the present invention, in order to effectively absorb the impact energy generated instantaneously during the operation of the airbag, by controlling the tensile strength and tear strength of the fabric at the same time in the optimum range can be improved together with the mechanical properties and folding properties of the final fabric. It is necessary to optimize the tensile strength and tear strength together in order for the fabric to absorb the momentary impact energy of the explosive gas generated inside the airbag at an early stage, and to achieve effective deployment and excellent folding. At this time, the tensile strength and tear strength of the fabric in the present invention needs to meet the above 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 95 kgf / inch, and at the same time, the fabric tear strength of which is represented by the formula 1 to T ₂ In other words, by maintaining the inclination tear strength of the polyester fabric to 6.5 kgf or more, it is possible to ensure a sufficient energy absorption performance during airbag deployment with high toughness. If the tensile strength and tearing strength of the fabric cannot be maintained above the minimum value, the fabric may be damaged by acting as a cause of tearing the fabric during deployment of the airbag.

In addition, the ratio (T ₁ / T ₂ ) of the tear strength to the tensile strength of the fabric becomes 4.5 or more, as shown in Equation 1 above, whereby the airbag fabric absorbs the hot-high pressure inflator pressure during airbag deployment. It is preferable in terms of protecting the material, and preferably 16.5 or less. If 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 and the It is undesirable because the fabric is too low in thermal strength. In particular, when the ratio (T ₁ / T ₂ ) of the tear strength to the tensile strength of the fabric is less than 4.5, the tensile strength is too low and the tear strength is too high so that the fabric density is low, and the air barrier property and the bowing resistance are high. The result can be a significant drop, making it impossible to effectively absorb hot-high pressure gas energy during airbag deployment. On the other hand, when the ratio of the tear strength to the tensile strength of the fabric (T ₁ / T ₂ ) exceeds 16.5, the tensile strength is too high and the tear strength is too low to increase the fabric density and air barrier properties and As the desorption resistance is increased, the fabric is very stiff and the fabric weight is high, so that the storage and folding properties of the vehicle are significantly reduced, and thus it may be difficult to apply it to an actual airbag cushion.

In addition, the polyester fabric may include a low fine yarn of 200 to 395 denier, preferably a polyester yarn of 210 to 395 denier, more preferably 230 to 390 denier. In this case, the polyester fabric may include more than 200 denier yarn to maintain the excellent mechanical properties in terms of absorption performance that can absorb the high-pressure deployment energy during airbag deployment. In addition, in order to effectively use the airbag fabric may include more than 395 denier yarn in terms of securing the cushioning properties and improved cushion weight of the more improved cushion.

Polyester fabric according to an embodiment of the present invention is the American Material Testing Association standard ASTM D 6479 method measured at room temperature inclination resistance (E ₁ ) is 200 N or more, American Material Testing Association standard ASTM D 6479 method As measured at room temperature, the sliding resistance in the weft direction (E ₂ ) is 200 N or more, and the sum of the sliding resistance (E ₁ ) in the inclined direction and the sliding resistance (E ₂ ) in the weft direction is as shown in Equation 2 below. You can,

[Equation 2]

400 ≤ E ₁ + E ₂ ≤ 900

In the above formula,

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

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

As described above, the polyester fabric of the present invention adjusts the edge comb resistance (E ₁ , E ₂ ) of the fabric in the warp direction and the weft direction to the optimum range, thereby improving the mechanical properties of the final fabric and energy for high temperature and high pressure gas. Absorption performance, folding property, etc. can be raised together. In particular, the fabric is hwaltal the one oblique direction measured at a room temperature resistivity (E ₁₎ may be these 200 N or more or about 200 to 450 N, preferably 250 N or more or 250 to 400 N, a weft direction measured at room temperature The deactivation resistance (E ₂ ) of may be 200 N or more or 200 to 450 N, preferably 250 N or more or 250 to 400 N. In addition, as shown in Formula 1, the sum of the sliding resistance in the warp direction and the sliding resistance in the weft direction may be 400 to 900 N, preferably 500 to 800 N. At this time, when the slipping resistance in the warp direction and the weft direction of the fabric is less than 200 N, respectively, the fabric strength of the airbag cushion sewing portion rapidly deteriorates when the airbag is deployed. It may be undesirable because the fabric tearing phenomenon occurs due to. At the same time, the sum of the inclination sliding resistance (E ₁ ) and the weft direction sliding resistance (E ₂ ) of the fabric must satisfy the above-mentioned range to prevent the seam of the sewing part when restraining the occupant when inflating the airbag. By suppressing as much as possible, it is possible to sufficiently suppress the internal pressure of the airbag.

In addition, the airtightness in the polyester fabric is to minimize the elongation by the high-pressure air or the like, and at the same time to maximize the energy absorption performance in the discharge of gas at high temperature and high pressure to ensure sufficient mechanical properties during operation of the airbag. very important. Accordingly, the fabric has a cover factor of 1,800 to 2,300, preferably 1,820 to 2,250, and weaving the fabric by optimizing the following formula 3 to further improve airtightness and energy absorption performance during airbag deployment.

[Equation 3]

Cover Factor (CF)

Herein, when the cover factor of the fabric is less than 1,800, air may easily be discharged to the outside when the air is inflated. When the cover factor of the fabric exceeds 2,300, the storage and folding properties of the airbag cushion remarkably when the airbag is installed. Can fall.

The polyester fabric for airbags of the present invention has a toughness of 1.5 kJ / m 3 or more or 1.5 to 3.5 kJ / m 3, preferably 1.8 kJ / m 3 or more or 1.8 kJ / m 3 to 3.2 kJ / May be m3.

[Calculation 4]

In the formula 4,

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

dl represents the length of the polyester fabric.

The polyester fabric can effectively absorb and withstand the energy of hot-high pressure gas as it satisfies a higher level of toughness (fracture) than the conventional fabric. In this case, the toughness is the energy consumed until the fabric is broken by the tensile force, as shown in Equation 4, and means the resistance of the fiber to a sudden impact. If a fiber increases its length from l to l + dl at load F, then the work is F · dl, so the toughness required to cut the fiber is as shown in Equation 4 above. That is, such toughness represents the cross-sectional area of the yarn and the fabric's strength-elongation curve (see FIG. 1), and the higher the strength and elongation of the yarn used in the fabric, the higher the toughness expressed in the fabric. In particular, when the toughness of the fabric for the airbag is lowered, the resistance of the fabric capable of sufficiently absorbing the instantaneous deployment impact of the inflator having a high temperature-high pressure during airbag deployment becomes low, resulting in the fabric of the airbag being easily torn. Therefore, when the toughness of the fabric in the present invention, for example, less than 1.5 kJ / ㎥ may be difficult to apply to the fabric for the air bag.

In general, polyester has a structure of high stiffness compared to nylon due to its molecular structure, and thus exhibits high modulus characteristics, and when used as a fabric for airbags, the folding and packing properties are remarkably reduced, resulting in a narrow automobile. Storage in the space becomes difficult. Accordingly, the present invention, using a polyester yarn having a high strength and low modulus characteristics, while maintaining the toughness and tear strength of the fabric, it is possible to significantly lower the stiffness of the fabric. Fabric for airbag of the present invention has a stiffness of 1.2 kgf or less or 0.3 to 1.2 kgf, preferably 1.0 kgf or less or 0.3 to 1.0 kgf, more preferably 0.9 kgf or less according to the American Society for Testing and Materials Standard ASTM D 4032 method or 0.3 to 0.9 kgf. As such, the stiffness of the fabric is significantly lowered than that of the conventional polyester fabric. Thus, the fabric for the airbag of the present invention may exhibit excellent folding and flexibility, and improved storage performance when the airbag is mounted.

In order to use the fabric of the present invention, it is preferable to maintain the above-mentioned stiffness range, and if the stiffness is too low, it may not have sufficient protective support function when the airbag is inflated and deployed. This may degrade the storage. In addition, in order to prevent storage property from falling and to prevent discoloration phenomenon of a raw material by becoming too hard and becoming difficult to fold, it is preferable that the said lecture degree is 1.2 kgf or less.

As described above, the airbag fabric may use a low-strength polyester yarn having a high strength and high elongation, thereby significantly lowering the thickness of the fabric while maintaining the mechanical properties and form stability of the fabric. In particular, the thickness of the airbag fabric according to the American Society for Testing and Materials Standard ASTM D 1777 is 290 mm or less or 50 to 290 mm, preferably 287 mm or less, or 55 to 287 mm, more preferably uncoated fabric. Can be up to 285 mm or from 60 to 285 mm. The fabric for the airbag of the present invention can secure a significantly improved low back range, and can exhibit excellent foldability and flexibility, and improved storage performance when the airbag is mounted.

Static air permeability according to the American Society for Testing and Materials Test standard ASTM D 737 method of the fabric for the air bag is 1.5 cfm or less or 0.0 to 1.5 cfm, preferably 1.2 cfm or less or 0.15 when △ P is 125 pa for the uncoated fabric To cfm, more preferably 1.0 cfm or less, or 0.15 to 1.0 cfm, and when ΔP is 500 pa, 10 cfm or less, or 2 to 8 cfm, preferably 8 cfm or less, or 1.5 to 8 cfm. Can be. In this case, the static air permeability refers to the amount of air that penetrates into the fabric when a certain pressure is applied to the fabric for the air bag, and the smaller the denier per filament of the yarn and the higher the density of the fabric, the lower the value.

In particular, the air permeability of the fabric for the airbag can be significantly lowered by including the rubber component coating layer in the fabric, it is possible to ensure the air permeability of the value close to almost 0 cfm. However, when the rubber component coating is performed as described above, the airbag coating fabric of the present invention has a static air permeability of 0.1 cfm or less from 0 to 0.1 cfm when △ P is 125 pa according to the American Society for Testing and Materials Standard ASTM D 737 method. It may be preferably 0.05 cfm or less or 0 to 0.05 cfm, and when ΔP is 500 pa, 0.3 cfm or less or 0 to 0.3 cfm, preferably 0.1 cfm or less or 0 to 0.1 cfm.

Here, the airbag fabric of the present invention may be undesirable in terms of maintaining the airtightness of the fabric for the airbag when the uncoated fabric and the coated fabric exceeds the upper limit of the static air permeability range, respectively.

The fabric for the air bag is 23% to 50% cut elongation measured at room temperature by the American Society for Testing and Materials Standard ASTM D 5034 method, preferably in the range of about 26% to 45%. In the case of the cutting elongation, it is preferable to be 23% or more in terms of physical properties required for existing airbags, and in reality, it is desirable to be 50% or less in terms of physical properties.

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

On the other hand, in the present invention, in order to ensure excellent performance as the fabric for the airbag, it is preferable to perform various aging to maintain the improved physical properties. In this case, the aging may be performed at least one selected from the group consisting of high temperature aging, cycle aging, and high humidity aging. Preferably, the aging is performed. After this, the strength and physical properties can be maintained to an excellent degree.

Here, the high temperature aging (Heat aging) is made of a heat treatment of the fabric at a high temperature, preferably may be made of a heat treatment for more than 300 hours or 300 to 500 hours at a temperature 110 to 130 ℃. In addition, 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 ° C and a relative humidity of 93 to 97% RH. Afterwards, the process of aging for 12 to 48 hours at 70 to 120 ° C. and for aging for 12 to 48 hours at −10 to −45 ° C. may be performed two to five times. Humidity aging consists of aging the fabric under high temperature and high humidity conditions, preferably aging for at least 300 hours or 300 to 500 hours at a temperature of 60 to 90 ° C. and a relative humidity of 93 to 97% RH. .

In particular, the fabric for the airbag of the present invention is a strength retention ratio calculated by the percentage of strength measured at room temperature after aging under the above conditions is 80% or more, preferably 85% or more, more preferably 90% or more. Can be. As such, even after long-term aging under severe conditions of high temperature and high humidity, the strength and strength of the fabric are maintained in an excellent range, thereby exhibiting excellent performance as an airbag fabric.

On the other hand, as described above, the polyester fabric of the present invention includes a polyester yarn having predetermined characteristics, and in particular, a yarn having a fineness of 200 to 395 deniers may be used so as to be maintained at low fineness and high strength.

The present invention uses a polyester yarn having a high modulus and a high modulus low modulus rather than a polyester yarn having a high modulus of high modulus and a high modulus, thereby not only having excellent energy absorption ability when inflating an airbag, but also having an excellent form. It is possible to provide a polyester fabric for airbags having stability, air barrier properties and excellent folding properties.

The polyester fabric may be 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. In order for the airbag fabric to maintain excellent physical properties even after aging under severe conditions of room temperature, high temperature, and high humidity, it is preferable to manufacture a polyester yarn with a polyester chip having an intrinsic viscosity of 1.05 dl / g or more. In addition, 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 in order to express low shrinkage characteristics.

The polyester yarn preferably has a shrinkage stress of 0.005 to 0.075 g / d at 150 ° C. corresponding to a laminate coating temperature of a general coating fabric, and a shrinkage stress at 200 ° C. corresponding to a sol coating temperature of a general coating fabric. It is preferred that it is from 0.005 to 0.075 g / d. In other words, when the shrinkage stress at 150 ° C. and 200 ° C. is more than 0.005 g / d, respectively, the fabric may be prevented from sagging due to heat during the coating process. Relaxation stress can be alleviated.

In addition, it is preferable that the polyester yarn has a shrinkage ratio of 6.5% or less at 177 ° C. in order to maintain a woven form by giving a tension or more at a predetermined level during heat treatment during the coating process to prevent the deformation of the fabric for the airbag.

The shrinkage stress defined in the present invention is based on a 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.

It is preferable that the said polyester yarn is a polyethylene terephthalate (PET) yarn among normal polyester, More preferably, it is a PET yarn containing 90 mol% or more of PET.

In addition, the polyester yarn may be a single yarn fineness of 2.6 to 5.5 DPF, preferably 2.8 to 4.4 DPF, in order to be effectively used in airbag fabrics to maintain a fineness range to be a low fineness high strength yarn It is preferable. In addition, the higher the number of filaments of the yarn may give a soft touch, but if too many may not be good radioactivity, the number of filaments is 60 to 144, preferably 65 to 125, more preferably 72 to 105 Can be.

In addition, the polyester yarn has a modulus (M ¹ ) of 1% elongation of Young's modulus measured by the method of the American Society for Testing and Materials ASTM D 885, 75 to 95 g / de, preferably 80 And from modulus (M ² ) at elongation 2% may be from 25 to 55 g / de, preferably from 27 to 50 g / de. As a conventional general industrial yarn, a polyester yarn has a modulus at 1% elongation of 110 g / de or more and a modulus at 2% elongation of 80 g / de or more. Compared with the case of using the conventional general industrial yarn, in the present invention it is possible to manufacture a fabric for the air bag using a polyester yarn having a significantly low modulus.

In this case, the modulus of the polyester yarn is a physical property value of the elastic modulus obtained from the slope of the elastic section of the stress-strain diagram obtained in the tensile test, and when the object is stretched from both sides, the elastic modulus indicating the degree of stretching and deformation of the object The value corresponds to If the modulus of the fiber is high, the elasticity is good, but the stiffness of the fabric may be deteriorated. If the modulus is too low, the stiffness of the fabric is good, but the elasticity of the fabric may be low, and thus the toughness of the fabric may be deteriorated. As such, fabrics for airbags made from polyester yarns having a lower initial modulus than conventional ones solve high stiffness problems of conventional polyester fabrics, and exhibit excellent folding, flexibility, and storage properties. Can be.

Toughness of the polyester yarn (Toughness) can be measured using a polyester yarn instead of a polyester fabric in the formula 4, the toughness of the measured yarn is 65 kJ / ㎥ or more or 65 to 90 J / ㎥ , Preferably 70 kJ / m 3 or more or 70 J / m 3 to 88 J / m 3. In particular, in the present invention, by using a specific polyester yarn that meets a high level of toughness (breaking days) compared to the conventional polyester yarn, the fabric for the air bag that can effectively absorb and withstand the energy of hot-high pressure gas This may be provided.

Further, the polyester yarn has a tensile strength of 8.6 g / d or more, preferably 8.6 to 9.6 g / d, more preferably 8.8 g / d to 9.3 g / d, and an elongation at break of 14% or more or 14%. To 23%, preferably 16.5% or more or 16.5% to 21%, and dry heat shrinkage may be 1.0% or more or 1.0% to 6.5%, more preferably 1.5% or more or 1.5% to 5.7%.

As described above, the polyester fabric of the present invention can exhibit excellent performance when manufactured as a fabric for airbags using low-fine polyester yarns having an intrinsic viscosity, initial modulus, and elongation range in an optimum range.

The polyester yarn may be prepared by melt spinning a PET polymer to prepare an unstretched yarn, and stretching the unstretched yarn, and specific conditions or processing methods of each of these steps may be directly or indirectly related to the physical properties of the polyester yarn. Polyester yarns that can be effectively reflected to the fabric for airbags of the present invention can be produced.

 In particular, in a more preferred embodiment, the high strength, high elongation, low modulus polyester yarn of 200 to 300 ℃ using a high viscosity polymer containing at least 70 mol% polyethylene terephthalate and intrinsic viscosity of at least 1.05 dl / g Melt spinning at low temperature to prepare a polyester non-drawn yarn, and the polyester non-drawn yarn can be prepared by a method comprising the step of stretching under the draw ratio conditions of 5.0 to 6.0. At this time, the intrinsic viscosity of the yarn by melt spinning under low temperature conditions, more preferably low temperature / low speed conditions using a high viscosity PET polymer having a low carboxyl end group (CEG) content, preferably 30 meq / kg or less It is possible to suppress the degradation and increase the CEG content to the maximum, and to maintain high elongation characteristics while maintaining excellent mechanical properties of the yarn. Further, by performing the stretching under the optimized drawing ratio conditions of 5.0 to 6.0 in the subsequent drawing process, by suppressing the lowering of the yarn elongation as much as possible, to prepare a polyester yarn having a high strength high elongation low modulus effectively to the fabric for airbags Applicable

Here, when the melt spinning process is performed at a high temperature, for example, when it is performed above 300 ° C., thermal decomposition of the PET polymer may occur in a large amount, thereby decreasing the intrinsic viscosity and increasing the CEG content. Increasing the orientation may increase the elongation of the elongation and increase the modulus, and the surface damage of the yarn may lead to a decrease in the overall physical properties is undesirable. In addition, if the drawing process is carried out under too high draw ratios, for example, draw ratios exceeding 6.0, the over-stretched level may result in cutting or mowing in the drawn yarns. It is difficult to exhibit desirable physical properties for use as a fabric. In addition, when the stretching process is performed under a relatively low draw ratio, the fiber orientation is low, and thus the strength of the polyester yarn manufactured therefrom may be partially lowered. Preferably, the drawing process is performed under a draw ratio of 5.0 or more to be applied to fabrics for airbags. It is possible to produce polyester yarns of high strength, high elongation, low modulus, which are suitable for.

On the other hand, in terms of producing a polyester yarn which is high strength and low modulus high elongation under such high draw ratio conditions, all conditions of the subsequent process, for example, relaxation rate, etc. in an appropriate range, preferably 11% to 14 Can be adjusted by%.

Through such process optimization, it is possible to secure a polyester yarn for airbags having a high initial strength and low elongation and high elongation. In addition, through optimization of the melt spinning and stretching process, it is possible to minimize the carboxyl end groups (CEGs), which exist as acids under high humidity conditions and cause basic molecular chain cleavage of polyester yarns. Therefore, such a polyester yarn exhibits a low initial modulus and a high elongation range at the same time, and thus can be preferably applied to fabrics for airbags having excellent mechanical properties and storage properties, shape stability, impact resistance, and air blocking effect.

In addition, according to another embodiment of the invention, the fabric for the air bag of the present invention may preferably further include a rubber component coating layer coated or laminated on the surface. 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.

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 OPW (One Piece Woven) type side curtain airbag fabric, the coating amount is preferably 30 g / m ² to 95 g / m ² , and in the case of plain weave fabric for air bag, the coating amount is 20 g / m ² to 50 g / m ² levels are preferred.

On the other hand, according to another embodiment of the present invention, there is provided a method for producing a fabric for airbags using a polyester yarn. The manufacturing method of the fabric for the airbag according to the present invention comprises the steps of weaving the dough for airbags using a polyester yarn having a fineness of 200 to 395 deniers, refining the woven fabric for airbags, and the refined fabric And terminating.

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

In particular, the fabric for the airbag of the present invention can be produced through a beaming, weaving, refining, and tenterizing process using the polyester yarn as a weft and warp yarn. The fabric can be produced using a conventional weaving machine, and is not limited to using any particular loom. However, plain weave fabrics can be manufactured using rapier looms, air jet looms, or water jet looms. OPW fabrics are Jacquard looms. Loom).

However, the present invention, by using a polyester yarn having a low shrinkage of high strength and high elongation than conventional, it is possible to perform a heat treatment process at a higher temperature than conventional. That is, in the present invention, after the process of refining and tentering the woven dough, coated with a rubber component on the tentered fabric and dried, the vulcanization temperature 140 to 210 ℃, preferably 160 to 200 ℃, and most preferably The curing process is carried out at 175 to 195 ℃, the vulcanization temperature may be more than 140 ℃ in terms of maintaining mechanical properties, such as tear strength of the fabric, it may be less than 210 ℃ in terms of stiffness. In particular, the heat treatment process may be carried out in a multi-step, for example, after performing the first heat treatment process at 150 to 170 ℃, after performing the second heat treatment process at 170 to 190 ℃, 3 at 190 to 210 ℃ A differential heat treatment process can be performed.

Thus, when manufacturing the polyester fabric of the present invention through a high temperature heat treatment process, by improving the density of the material, such as the low shrinkage characteristics of the polyester yarn itself, excellent morphological stability and air barrier effect, improving the ductility and tear strength improvement The effect can be given even more.

 In addition, the curing time at the vulcanization temperature may be carried out in the range of 30 to 120 seconds, preferably 35 to 100 seconds, and most preferably 40 to 90 seconds. In this case, when the curing time is less than 30 seconds, there is a problem that the hardening of the coating layer by the rubber component is not effectively performed and the mechanical properties of the fabric are lowered, so that the coating is peeled off. When the curing time exceeds 120 seconds, Due to the increase in the stiffness and thickness of the final fabric is produced a problem of poor folding properties.

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

The coated airbag fabric may be manufactured in the form of an airbag cushion having a predetermined shape while cutting and sewing. The airbag is not limited to a particular form and may 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 polyester fabric described above. In addition, there is provided an airbag system comprising the above airbag, which may be provided with conventional devices well known to those skilled in the art.

The airbag may be largely classified into a frontal airbag and a side curtain airbag. The frontal airbag includes a driver's seat, a passenger seat, a side protection, a knee protection, ankle protection, a pedestrian protection airbag, and the side curtain type airbag protects passengers in a vehicle collision or rollover accident. Accordingly, the airbag of the present invention includes both a frontal airbag and a 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.

According to the present invention, there is provided a polyester fabric for airbags having excellent energy absorption performance in airbag deployment, and a vehicle airbag obtained using the same.

This airbag fabric uses low modulus, high strength and high elongation, low fineness polyester yarn to minimize heat shrinkage even through high temperature heat treatment process, and can obtain excellent form stability, mechanical properties, and air barrier effect. At the same time, it is possible to secure excellent folding and flexibility, which significantly improves the storage performance of the vehicle and at the same time minimizes the impact on the passengers to protect the occupants.

Therefore, the polyester fabric of the present invention can be very preferably used for the production of vehicle airbags and the like.

Figure 1 shows an example of the strength-elongation curve of a general fiber, the area of this strength-elongation curve can be defined as toughness (breaking days, J / ㎥).
Figure 2 shows the strength-elongation curve of the polyester fabric according to Example 5 of the present invention.
Figure 3 shows the strength-elongation curves of polyester fabric according to Comparative Example 5 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

After producing a polyester yarn in one step from a PET chip having a predetermined intrinsic viscosity through a melt spinning machine, weaving the fabric dough for airbags through a rapier weaving machine using the yarns, and then refining and tentering the airbags. Fabrics were prepared for the coating, and a liquid silicone rubber (LSR) resin was coated on the fabric by a knife over method to prepare a silicon coated fabric.

At this time, the intrinsic viscosity, CEG content, melt spinning temperature, elongation ratio, and intrinsic viscosity of the PET chip, toughness, physical properties such as modulus, tensile strength at 1% and 2% of yarn, warp and weft density of fabric, weaving form , Heat treatment temperature, rubber components, resin coating amount is as shown in Table 1, the remaining conditions were in accordance with the conventional conditions for the production of 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 of PET chip (dl / g) 1.25 1.33 1.40 1.50 1.60 CEG of PET chip (meq / kg) 30 27 24 23 22 Spinning temperature (℃) 293 295 295 295 295 Elongation ratio 5.80 5.90 6.00 6.05 6.10 Intrinsic Viscosity of Yarn (dl / g) 0.93 0.97 1.05 1.11 1.20 Toughness of yarn
(Toughness, J / ㎥) 70 75 81 83 85 Modulus of yarn
(At elongation 1%, g / de) 88 89.5 76 75 85 Modulus of yarn
(At elongation 2%, g / de) 47.5 48.6 29.0 29.3 28.2 Tensile Strength of Yarn (g / de) 8.8 8.85 8.95 9.10 9.20 Cutting Elongation of Yarn (%) 16.5 16.8 17.5 17.5 18.1 Dry heat shrinkage (%) 5.0 5.3 2.8 4.0 5.3 Single Sand Island (DPF) 3.38 3.19 2.40 4.06 3.25 Total fineness (de) 230 230 230 390 390 Filament number 68 72 96 96 120 Weaving Density (Inclined X Weft) 72 x 72 72 x 72 72 x 72 52 x 52 52 x 52 Weaving Form Plain weave Plain weave Plain weave Plain weave Plain weave Heat treatment / vulcanization temperature (℃) 180 185 185 185 185 185 180 185 185 185 185 185 Rubber ingredient Liquid silicone Liquid silicone Liquid silicone Liquid silicone Liquid silicone Rubber coating amount (g / m ² ) 25 25 25 25 25

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

(a) Tensile strength and elongation at break

Cut the specimen with the uncoated fabric before coating and fix it to the lower clamp of the tensile strength measuring device according to ASTM D 5034, the tensile strength at the time of breaking the airbag fabric specimen while moving the upper clamp upward. T ₁ ) and elongation at break were measured.

(b) tear strength

After uncoated fabric prior to coating treatment, each specimen was cut 75 mm x 200 mm in width, and then the top and bottom of each specimen were bitten at the top and bottom of the device according to ASTM D 2261 TONGUE. Located between the left and right spaces of the jaw face, the jaw face spacing is based on 76 mm / min, tear strength (T ₂ ) for the uncoated fabric at 300 mm / min speed Each was measured.

(c) bow resistance

Uncoated fabric before coating treatment was used to measure the deactivation resistance (E ₁ , E ₂ ) in the warp and weft directions at room temperature (25 ° C.) by the method according to the American Society for Testing and Materials, ASTM D 6479.

(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

Toughness (J / m 3) values were calculated by the following equation (4).

[Calculation 4]

In the formula 4,

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

dl represents the length of the polyester fabric.

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

(f) Fabric shrinkage in warp and weft directions

Fabric shrinkage in the warp / weft direction was measured according to the American Society for Testing and Materials, ASTM D 1776. First, after cutting the specimen with an uncoated fabric before coating treatment, mark the length before shrinking in the warp and weft directions by 20 cm, and measure the contracted length of the specimen heat-treated in the chamber at 149 ° C. for 1 hour in the warp direction. And weaving shrinkage ratio {(length before contraction-length after contraction) / length before contraction x 100%} in the weft direction.

(g) lecture

The uncoated fabric before coating treatment was measured by the circular bend method using a ductility measuring apparatus according to the American Society for Testing and Materials Standard ASTM D 4032. In addition, the cantilever method may be applied as a method of measuring the stiffness, and the stiffness can be measured by measuring the bend length of the fabric using a cantilever measuring device, which is a test bench that is inclined at an angle to give a bend to the fabric.

(h) after

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

(i) air permeability

After allowed to stand over one day under the American Society for Testing and Materials specification according to ASTM D 737 20 ℃ the uncoated fabric before coating, 65% RH, △ P, each 125 of the pressure pa and 500 pa of the air is 38 cm ² The amount passing through the circular section was measured and expressed as static air permeability.

division Example 1 Example 2 Example 3 Example 4 Example 5 Tensile tensile strength of fabric (T ₁ , kgf / inch) 103 105 108 222 225 Slant tear strength of fabric (T ₂ , kgf) / uncoated 6.9 7.1 7.3 19 20 Slant tear strength of fabric (T ₂ , kgf) / coating 22 22 23 32 33 T ₁ / T ₂ (Uncoated) 14.9 14.8 14.8 11.7 11.3 T ₁ / T ₂ (coating) 4.7 4.8 4.7 6.9 6.8 Rolling resistance of inclined direction of fabric (E ₁ , N) 265 268 270 330 340 Weaving resistance of weft direction of fabric (E ₂ , N) 278 280 283 335 337 E ₁ + E ₂ 543 548 553 665 677 Fabric Cover Factor 2183 2183 2183 2053 2053 Fabric toughness
(Toughness, kJ / ㎥) 1.83 1.84 1.85 3.25 3.40 Elongation at break of fabric (%) 25 25 27 30 37 Fabric Shrinkage (%) 0.5 0.5 0.4 0.4 0.5 Lecture
(kgf) slope 0.65 0.66 0.53 0.85 0.78 Weft 0.69 0.70 0.56 0.88 0.81 Thickness (mm) 210 210 211 280 283 Static air permeability
(cfm) △ P = 125 pa 0.3 0.3 0.3 1.4 1.4 △ P = 500 pa 7.5 7.5 7.3 9.5 9.4

Comparative example  1-5

A polyester fabric for airbags of Comparative Examples 1 to 5 was prepared according to the same method as 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 of PET chip (dl / g) 0.80 0.82 0.84 0.82 0.84 CEG of PET chip (meq / kg) 50 47 43 47 43 Spinning temperature (℃) 301 302 305 302 305 Elongation ratio 4.75 4.77 4.85 4.85 4.88 Intrinsic Viscosity of Yarn (dl / g) 0.61 0.63 0.65 0.63 0.65 Toughness of yarn
(Toughness, J / ㎥) 53 54 56 54 58 Modulus of yarn
(At elongation 1%, g / de) 115 119 125 119 125 Modulus of yarn
(At elongation 2%, g / de) 85 91 93 91 93 Tensile Strength of Yarn (g / de) 6.5 6.8 7.0 6.9 7.2 Cutting Elongation of Yarn (%) 10 11 11 11 12 Dry heat shrinkage (%) 15.5 15 13.7 15 13.7 Single Sand Island (DPF) 7.92 7.92 7.92 7.22 7.22 Total fineness (de) 190 190 190 260 260 Filament number 24 24 24 36 36 Weaving Density
(Bevel X weft) 76 x 76 76 x 76 76 x 76 66 x 66 66 x 66 Weaving Form Plain weave Plain weave Plain weave Plain weave Plain weave Heat treatment / vulcanization temperature (℃) 160 160 165 160 165 165 160 160 165 160 165 165 Rubber ingredient Liquid silicone Liquid silicone Liquid silicone Liquid silicone Liquid silicone Rubber coating amount (g / m ² ) 35 35 35 35 35

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 Tensile tensile strength of fabric (T ₁ , kgf / inch) 78 78 80 92 93 Slant tear strength of fabric (T ₂ , kgf) / uncoated 4.2 4.2 4.3 5.3 5.4 Slant tear strength of fabric (T ₂ , kgf) / coating 19 19.3 19.5 22 23 T ₁ / T ₂ (Uncoated) 18.1 18.1 18.6 17.4 17.2 T ₁ / T ₂ (coating) 4.1 4.0 4.1 4.2 4.0 Rolling resistance of inclined direction of fabric (E ₁ , N) 175 176 178 188 189 Weaving resistance of weft direction of fabric (E ₂ , N) 180 183 188 193 197 E ₁ + E ₂ 355 359 366 381 386 Fabric Cover Factor 2095 2095 2095 2128 2128 Fabric toughness
(Toughness, kJ / ㎥) 1.40 1.41 1.41 1.45 1.46 Elongation at break of fabric (%) 19 19 19.2 20.5 21 Fabric Shrinkage (%) 1.3 1.3 1.2 1.2 1.1 Lecture
(kgf) slope 1.6 1.6 1.66 1.75 1.76 Weft 1.63 1.66 1.70 1.80 1.83 Thickness (mm) 210 210 211 22 225 Static air permeability
(cfm) △ P = 125 pa 1.60 1.60 1.60 2.15 2.16 △ P = 500 pa 11.0 11.0 10.8 15.0 14.8

As shown in Tables 2 and 4, Example 1 in which the ratio of tear strength to tensile strength was optimized using a polyester yarn having high modulus (Young's modulus) of high strength and high elongation according to the present invention It can be seen that the polyester fabric for the airbag of ˜5 has excellent mechanical properties and excellent physical properties, such as improved mechanical shrinkage, ductility, and air permeability, compared to the airbag fabric 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 has a tensile strength (T ₁ ) of 103 to 225 kgf / inch, the tear strength (T ₂ ) of the uncoated fabric is 6.9 to 20 kgf, tear strength (T ₂ ) of the coating fabric is 22 to 33 kgf, the ratio (T ₁ / T ₂ ) of tensile strength (T ₁ ) and tear strength (T ₂ ) is optimized to 4.7 to 14.9 , The toughness of the fabric is 1.83 to 3.40 kJ / m ³ , the sliding resistance of the warp direction and the weft direction is 265 to 340 N, and the cover factor of the fabric is 2,053 to 2,183 and the fabric shrinkage is 0.4% to 0.5%. It can be seen that it has excellent characteristics. At the same time, it can be seen that the polyester fabric for airbags of Examples 1 to 5 has an excellent optimum range of 0.65 to 0.88 kgf of ductility, and thus has excellent foldability and storage property together with excellent shape stability and mechanical properties. . In addition, the fabric for airbags of Examples 1 to 5 has a static air permeability (ΔP = 125 pa) level of 0.3 to 1.4 cfm for the uncoated fabric using a low fine yarn having a low modulus of high strength and high elongation, It can be seen that the static air permeability (ΔP = 500 pa) is in the range of 7.3 to 9.5 cfm, resulting in excellent airtight results.

On the other hand, as shown in Table 4, the airbag fabric of Comparative Examples 1 to 5 using a polyester yarn having a high modulus (Young's modulus) of low strength and low elongation did not satisfy these characteristics. It became. In particular, the airbag fabrics of Comparative Examples 1 to 5 have a toughness of 1.4 to 1.46 kJ / m ³ , the sliding resistance of the warp direction and the weft direction are 175 to 197 N, respectively, and the fabric shrinkage rate is significantly decreased to 1.1% to 1.3%. It can be seen. As such, when a fabric having significantly lower mechanical properties, such as tensile strength and desorption resistance, is used in the airbag device, problems may occur due to a decrease in mechanical properties such as an airbag bursting when the airbag is deployed. In addition, it can be seen that the air permeability of the non-coated fabric according to Comparative Examples 1 to 5 greatly increased to 1.60 to 2.16 cfm, thereby decreasing the airtightness.In this case, when the air permeability is increased, the air easily escapes during the deployment of the air bag to serve as an air bag. You may have problems you won't be able to.

In addition, the strength-elongation curves of the polyester fabrics according to Example 5 and Comparative Example 5 are shown in FIGS. 2 and 3, respectively. As shown in FIG. 2, the polyester fabric according to Example 5 exhibits high toughness and low modulus in the strength-elongation graph. On the other hand, it can be seen that the polyester fabric according to Comparative Example 5 exhibits low toughness and high modulus in the strength-elongation graph, as shown in FIG. 3.

Therefore, the polyester fabric according to Example 5 has an excellent ability to absorb the hot-high pressure inflator gas energy when the airbag is deployed, but also has an excellent advantage in terms of the airtight cushioning (packaging) performance. However, the polyester fabric according to Comparative Example 5 is not suitable for use as a fabric for airbags by not only insufficient absorbing performance of the instantaneous impact energy of the exhaust gas during airbag deployment, but also worsens the air blocking effect performance. It can be seen that.

Claims (14)

A polyester yarn having a fineness of 200 to 395 denier,
Tensile strength (T ₁ ) measured by ASTM D 5034 method is 95 kgf / inch or more, and tear strength (T ₂ ) measured by ASTM D 2261 TONGUE method is 6.5 kgf or more. It is the tensile strength (T ₁₎ and the tear strength (T ₂₎ ratio (T ₁ / T ₂₎ to the air bag polyester fabrics such as shown in formula 1:
[Calculation 1]
4.5 ≤ T ₁ / T ₂ ≤ 16.5
In the above formula,
T ₁ is the diagonal tensile strength (kgf / inch) of the polyester fabric,
T ₂ is the diagonal tear strength (kgf) of polyester fabric. The method of claim 1,
Gradient decay resistance (E ₁ ) measured at room temperature by the ASTM D 6479 method is 200 N or more, and decay resistance of weft direction measured at room temperature by the ASTM D 6479 method (E. ₂ ) is 200 N or more, and the sum of the sliding resistance (E ₁ ) in the warp direction and the sliding resistance (E ₂ ) in the weft direction is a polyester fabric for an air bag, as shown in the following formula ( ₂ ):
[Equation 2]
400 ≤ E ₁ + E ₂ ≤ 900
In the above formula,
E ₁ is the inclination direction sliding resistance (N) of the polyester fabric measured at room temperature,
E ₂ is the weft direction sliding resistance (N) of the polyester fabric measured at room temperature. The method of claim 1,
A polyester fabric for airbags having a cover factor of 1,800 to 2,300 as defined by Formula 3 below:
[Calculation 3]
Cover Factor (CF)

The method of claim 1,
Polyester fabric for air bags with a stiffness of 1.2 kgf or less according to ASTM D 4032 method. The method of claim 1,
Static air permeability according to the American Society for Testing and Materials Test ASTM D 737 method is 2.5 cfm or less when △ P 125 pa, 10 polyester or less for air bags when △ P 500 pa. The method of claim 1,
Polyester fabric for airbags comprising polyester yarns with 14% to 23% stretch and 1.0% to 6.5% dry heat shrinkage The method of claim 1,
Polyester fabric for airbags comprising a polyester yarn with a Young's modulus measured by the method of ASTM D 885 at 75 to 95 g / de at 1% elongation and 25 to 55 g / de at 2% elongation. . The method of claim 1,
Polyester fabric for airbags comprising a polyester yarn made from a polyester chip having an intrinsic viscosity of 1.05 to 1.80 dl / g. The method of claim 1,
A polyester fabric for an air bag coated with at least one rubber component selected from the group consisting of powder type silicone, liquid type silicone, polyurethane, chloroprene, neoprene rubber, and emulsion type silicone resin. 10. The method of claim 9,
Polyester fabric for an air bag of 20 to 200 g / m ² coating amount per unit area of the rubber component. Weaving dough for airbags with a polyester yarn having a fineness of 200 to 395 denier,
Refining the dough for the woven airbag, and
Tentering the refined fabric
A method for producing a polyester fabric for airbags according to any one of claims 1 to 10, including. The method of claim 11,
In the tenter step, the heat treatment temperature is 140 to 210 ℃ manufacturing method for the fabric for airbags. A vehicle airbag comprising the fabric for an airbag according to any one of claims 1 to 10. The method of claim 13,
The airbag is a vehicle airbag is a frontal airbag or side curtain type airbag.

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