Polyester base fabric for airbags, and method for manufacturing the same.

Abstract

The present invention aims to provide a polyester base fabric for airbags that primarily uses polyester fibers with excellent recyclability, while maintaining the mechanical properties required for airbag base fabrics and also possessing excellent storage characteristics. [Solution] A polyester base fabric for airbags, characterized in that the total fineness of the warp and weft threads constituting the fabric is 550 dtex or more, and the void ratio of the cross-sections of the warp and weft threads constituting the fabric is 2% or less.

Description

[Technical Field]

[0001] This invention relates to a polyester base fabric for airbags. [Background technology]

[0002] In recent years, airbags have become widely installed as occupant safety devices in automobiles. Their installation locations have expanded to include driver's seats, passenger seats, thigh protection built into seats, and curtain airbags that deploy along side windows, and the amount of airbag base fabric used per automobile is on the rise. Currently, the base fabric that makes up airbags mainly uses nylon fibers, particularly nylon 6,6 fibers, which have properties suitable for airbag base fabrics. However, nylon 6,6 fibers are relatively expensive, and the cost burden is increasing as airbags become more widespread. Therefore, there is a demand for airbag base fabrics that mainly use polyester fibers, which are more cost-effective and have better recyclability than nylon 6,6 fibers.

[0003] Patent Document 1 discloses a polyester airbag base fabric having excellent mechanical properties and long-term durability.

[0004] Patent Document 2 discloses a polyester airbag base fabric that is excellent in flexibility, tear strength, and tear elongation.

[0005] Airbag base fabrics are required to possess various automotive characteristics in order to protect vehicle occupants. For example, airbag base fabrics must not only be deployable but also possess various mechanical properties necessary to catch occupants. In addition, high storability is required to install the modules in the limited space of a vehicle. For this reason, if an airbag base fabric can be realized that is mainly made of highly recyclable polyester fibers and has superior mechanical properties and storability, the adoption of polyester airbag base fabrics may rapidly increase. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] International Publication No. 2021 / 132575 [Patent Document 2] International Publication No. 2019 / 017273 [Disclosure of the Invention] [Problems that the invention aims to solve]

[0007] This invention was made against the backdrop of the problems of the prior art described above, and aims to provide a polyester base fabric for airbags that mainly uses polyester fibers with excellent recyclability, maintains the mechanical properties required for airbag base fabrics, and also maintains excellent storage properties. [Means for solving the problem]

[0008] The inventors of this invention have diligently researched and, as a result, have finally completed the present invention. That is, the present invention is as follows:

[0009] [1] The total fineness of the warp and weft threads that make up the fabric is 550 dtex or more. A polyester base fabric for airbags, characterized in that the void ratio of the warp and weft cross-sections constituting the fabric is 2% or less. [2] Storage capacity is 2100cm 3 The following is the polyester base fabric for airbags described in [1]. [3] A polyester base fabric for airbags according to [1] or [2], wherein the tensile strength in the warp and weft directions is 750 N / cm or more. [4] Polyester base fabric for airbags as described in [1] to [3], comprising polyester fibers with 196 or more filaments. [5] A polyester base fabric for airbags as described in [1] to [4], having a cover factor of 2200 or more and 2600 or less. [6] At least one side is coated with a silicone resin, in an amount of 5 g / m². 2 More than 50g / m2 The following polyester base fabrics for airbags are described in [1] to [5]. [7] A method for manufacturing polyester base fabric for airbags, (a) The process of preparing the warp and weft threads and weaving them, (b) A process of shrinking the base fabric obtained by weaving and then drying it, Equipped with, A method for producing a polyester base fabric for an airbag, characterized in that the number of filaments in the warp and weft threads prepared in step (a) is 196 or more polyester fibers. [8] Furthermore, (c) a step of placing a silicone resin on at least one side of the woven base fabric, and then curing the silicone resin by heat treatment, A method for producing a polyester base fabric for an airbag according to [7], wherein the temperature difference between the drying temperature in step (b) and the curing temperature in step (c) is 40°C or less. [9] The method for producing a polyester base fabric for an airbag according to claim 7 or 8, wherein the curing temperature in step (c) is 180°C or higher and 190°C or lower. [Effects of the Invention]

[0010] According to the present invention, it is possible to provide a polyester base fabric for airbags that mainly uses polyester fibers with excellent recyclability, maintains the mechanical properties required for airbag base fabrics, and also maintains excellent storage properties. [Brief explanation of the drawing]

[0011] [Figure 1] This image shows the porosity analyzed using a scanning electron microscope (SEM) image of a cross-section of the warp threads in Example 1 of this application. [Figure 2] This image shows the porosity analyzed using an SEM image of the warp cross-section of Comparative Example 1 of the present invention. [Modes for carrying out the invention]

[0012] Hereinafter, the present invention will be described in more detail based on specific examples. However, the present invention is not limited to the following examples at all, and can be appropriately modified and implemented within a range that does not alter its gist.

[0013] 1. Polyester base fabric for airbags The technical concept of the present invention is that the total fineness of the warp and weft constituting the woven fabric is 550 dtex or more, and the porosity of the warp cross section and the weft cross section constituting the polyester base fabric for airbags is 2% or less.

[0014] The present inventors conducted detailed analysis on polyester base fabrics and polyamide base fabrics, and found that if the porosity of the warp cross section and the weft cross section constituting the woven fabric is 2% or less, a base fabric for airbags having excellent mechanical properties and storability can be obtained even with a polyester base fabric. More preferably, the porosity of the warp cross section and the weft cross section constituting the woven fabric is 1% or less.

[0015] By reducing the porosity, the total volume of the woven fabric can be reduced, and as a result, a base fabric satisfying storability can be obtained. In addition, the reduced porosity improves the alignment of the constituent yarns, and as a result, a base fabric satisfying strength can be obtained. The present inventors have found that the lower the porosity, the more the aforementioned effects can be achieved, and as a result, a polyester base fabric for airbags having excellent strength and storability can be obtained. According to this, a polyester base fabric for airbags having excellent base fabric tensile strength and storability can be obtained.

[0016] In the present invention, the storability of the base fabric means a property measured by a method conforming to ASTM D6478. In addition, the base fabric tensile strength means a property measured by a method conforming to JIS L1096 (2010) 8.12.1. In the sense of efficiently mounting the final product base fabric for airbags on an automobile, the storability value obtained by the above measurement is 2100 cm 3 or less, more preferably 2050 cm 3 or less.

[0017] In this invention, the void ratio of the warp and weft cross-sections constituting the fabric refers to the value measured and calculated by the following method. (i) Take at least three small samples from the airbag base fabric that allow observation of the warp and weft cross-sections. (ii) The cross-sections of the collected small pieces are photographed at 150x magnification using a scanning electron microscope (SEM) or the like, showing both the warp and weft cross-sections. (iii) Photographs of each small sample are analyzed using the image analysis software "ImageJ" manufactured by the National Institutes of Health, USA. (iv) The image is a grayscale image (8-bit image), and an image analysis is performed with a threshold set so that the void region in the warp or weft cross-section changes color, and the proportion of the void region in the warp or weft cross-section is calculated as the void ratio.

[0018] The cover factor (CF) of the polyester base fabric for airbags of the present invention is preferably 2200 or more and 2600 or less, considering the mechanical properties of the airbag. A more preferable lower limit for the cover factor (CF) is 2300, and a more preferable upper limit for the cover factor (CF) is 2500. If the CF value is 2200 or more, the mechanical properties required for airbags, such as tensile strength, can be made good. If the CF value is 2600 or less, the rigidity of the base fabric will not become unnecessarily large, which is preferable in terms of the foldability of the fabric, i.e., storageability. The cash flow (CF) was calculated using the following formula.

number

[0019] From the viewpoint of breathability, the polyester base fabric for airbags of the present invention preferably has a coating material on at least one side. The coating material is a silicone resin, and the density is 5 g / m². 2 More than 50g / m 2 The following coatings are preferable. Silicone resin is relatively inexpensive and can ensure excellent low breathability. Furthermore, within the range of the above resin coating amounts, the thickness of the coating material will not become unnecessarily thick, which is also preferable in terms of the foldability of the base fabric, i.e., its storage capabilities.

[0020] The polyester base fabric for airbags of the present invention is preferably composed of polyester fibers with a total fineness of 550 dtex or more. A total fineness of 550 dtex or more increases the tensile strength of the base fabric, thereby suppressing the effects of deterioration due to hydrolysis and other factors when the airbag is deployed.

[0021] The polyester base fabric for airbags of the present invention is preferably composed of polyester fibers with a single yarn fineness of 5.0 dtex or less. A single yarn fineness of 5.0 dtex or less ensures both spinning efficiency and ease of airbag storage.

[0022] The polyester fibers used in the polyester base fabric for airbags of the present invention are not particularly limited, but examples include polyethylene terephthalate and polybutylene terephthalate. They may also be copolymerized polyesters in which polyethylene terephthalate or polybutylene terephthalate is copolymerized with an aliphatic dicarboxylic acid such as isophthalic acid, 5-sodium sulfisoisophthalic acid, or adipic acid as an acid component. From the viewpoint of recyclability, polyester fibers containing polyethylene terephthalate as the main component are preferred.

[0023] The polyester base fabric for airbags of the present invention preferably has a weave density of 40 threads / 2.54 cm or more in both the warp and weft directions, and more preferably 46 threads / 2.54 cm or more. A weave density of 46 threads / 2.54 cm or more can suppress the collapse of the base fabric structure during weaving. Furthermore, from the viewpoint of constraints on weft insertion during weaving, a weave density of 70 threads / 2.54 cm or less is preferable.

[0024] In this invention, the weave density refers to the value measured by the method in accordance with JIS L1096(2010)8.6.1. Specifically, the sample is placed on a flat surface, unnatural wrinkles and tension are removed, and then the number of warp and weft threads in 2.54 cm sections at five different locations is counted. The average value of each is calculated per unit length and used as the weave density.

[0025] The tensile strength in the warp and weft directions of the polyester base fabric for airbags of the present invention is preferably 750 N / cm or more, and more preferably 760 N / cm or more, from the viewpoint of long-term durability. By setting the tensile strength of the base fabric within this range, the effects of deterioration due to hydrolysis and other factors can be suppressed when the airbag is deployed.

[0026] In this invention, the tensile strength of the base fabric refers to the value measured by the method in accordance with JIS L1096(2010)8.12.1. Test specimens are prepared in both the warp and weft directions. Specifically, the test specimen is gripped in a tensile testing machine under an initial load, and the test is performed under the conditions of a specimen width of 50 mm, a gripping distance of 200 mm, and a tensile speed of 200 m / min, and the strength at break (N) is measured.

[0027] The following describes in detail suitable manufacturing methods for obtaining the polyester base fabric for airbags of the present invention, but the polyester base fabric for airbags of the present invention is not limited to base fabrics manufactured by these methods.

[0028] 2.Weaving process In manufacturing the polyester base fabric for airbags of the present invention, firstly, warp and weft threads to be used for weaving are prepared. The warp and weft threads are not particularly limited, but examples include polyethylene terephthalate and polybutylene terephthalate. They may also be fibers made of copolymerized polyester in which polyethylene terephthalate or polybutylene terephthalate is copolymerized with an aliphatic dicarboxylic acid such as isophthalic acid, 5-sodium sulfisoisophthalic acid, or adipic acid as an acid component. From the viewpoint of recyclability, polyester fibers containing polyethylene terephthalate as the main component are preferred.

[0029] It is preferable that the warp and weft threads have 196 or more filaments. By having 196 or more filaments, the thickness of each filament that makes up the fiber becomes thinner, and the void ratio in the cross-section of the warp and weft threads can be reduced.

[0030] Furthermore, it is preferable that the warp and weft threads are composed of polyester fibers with a total fineness of 550 dtex or higher. If the polyester fibers have a total fineness of 550 dtex or higher, the tensile strength of the final base fabric can be increased, and the effects of deterioration due to hydrolysis and other factors can be suppressed when the airbag is deployed.

[0031] The warp tension when weaving the base fabric is preferably 120-200 cN / thread. If the warp tension is 120 cN / thread or higher, slack in the warp threads during weaving is less likely to occur, which can lead to defects in the base fabric and loom stoppages, and can also increase the crimp rate. On the other hand, if the warp tension is 200 cN / thread or lower, it is easier to avoid applying excessive load to the warp threads, which can lead to defects in the base fabric.

[0032] During weaving, it is preferable to set the dwell angle of the reed to 60° to 120° in order to suppress defects in the base fabric and reduce the void ratio. By setting the dwell angle of the reed within this range, a space for the weft yarn to fly can be secured, thereby suppressing defects in the base fabric.

[0033] In the weaving process, it is preferable to set the winding tension in the winding machine to between 250N and 1500N. By setting the winding tension low enough to prevent wrinkles and slack during winding, defects in the base fabric can be reduced.

[0034] For the drying and finishing process, it is preferable to use a hot air dryer from the viewpoint of production efficiency. The temperature of the hot air dryer is preferably around 150°C. This temperature range allows the base fabric to be thoroughly dried.

[0035] 4. Coating process The coating material used in the coating process is preferably an elastomer resin having heat resistance, cold resistance, and flame retardancy. While there are no particular limitations on the elastomer resin, it is preferable to select a silicone-based resin when considering the required material properties and cost aspects comprehensively.

[0036] Specific examples of silicone resins include addition polymerization type silicone rubber. Examples include dimethyl silicone rubber, methyl vinyl silicone rubber, methylphenyl silicone rubber, trimethyl silicone rubber, fluorosilicone rubber, methyl silicone resin, methylphenyl silicone resin, methyl vinyl silicone resin, epoxy-modified silicone resin, acrylic-modified silicone resin, and polyester-modified silicone resin. Among these, methyl vinyl silicone rubber is preferred because it has rubber elasticity after curing, excellent strength and elongation, and is also cost-effective. Furthermore, solvent-free silicones are desirable to satisfy the mechanical properties of airbags, especially their storability.

[0037] The viscosity of the coating material is preferably 10 Pa·sec to 40 Pa·sec, and more preferably 15 Pa·sec to 40 Pa·sec. By setting the viscosity of the coating material within this range, the resin can be efficiently distributed to the interlocking portions of the warp and weft threads on the uncoated surface of the base fabric, thereby improving tensile strength. In this invention, if the resin composition contains additives other than resin, the viscosity of the resin composition is also defined as the "resin viscosity."

[0038] Furthermore, the hardness of the coating material is measured according to the ASTM D2240 method, and it is preferable that the hardness measured using a Shore A hardness tester be 40 or less. More preferably, it is 38 or less. When the hardness is 40 or less, the resin deforms, improving the packability of the base fabric. There is no particular lower limit, but from the viewpoint of durability, it is preferable to be 25 or more.

[0039] Conventional known methods can be used for applying resin, but knife coating, particularly the knife-on-air method, is most preferred due to the ease of adjusting the amount of coating and the impact of foreign matter (protrusions) being mixed in. In the knife-on-bed method, the resin can easily penetrate into the fabric, but it becomes difficult to keep the resin on the top surface of the fabric, making it impossible to achieve the breathability suppression that is originally required for coated fabric. In the present invention, the knife used in knife coating can have a blade tip shape such as a semicircular or angular shape.

[0040] In knife-on-air coating, the base fabric tension in the direction of travel is preferably 500 N / m to 2000 N / m, and particularly preferably 1000 N / m to 1800 N / m. By setting the base fabric tension in the direction of travel to 500 N / m or more, the bulk of the selvage portion of the base fabric is reduced, and the difference in coating amount between the center and edges of the base fabric can be minimized. On the other hand, by setting the base fabric tension in the direction of travel to 2000 N / m or less, resin can be distributed in the gaps between the warp and weft threads on the uncoated surface, thereby suppressing air permeability.

[0041] It is important that the knife is pressed in between 1 mm and 6 mm. In the knife-on-air method, the knife is pressed in downwards from a height of 0 mm, with the height of the bed directly in front of it being 0 mm. More preferably, it is between 1.5 mm and 4.5 mm. By pressing the knife in between 1 mm or more, the resin can be placed in the gaps between the warp and weft threads on the uncoated side. By pressing it in between 6 mm or less, the resin does not penetrate excessively into the interior of the fabric, and the resin can be placed at the top of the fabric on the coated side, thereby suppressing air permeability. At the same time, the void ratio in the cross-section of the warp and weft threads in the final manufactured base fabric can be reduced.

[0042] If the coating material is a thermosetting resin such as a silicone resin, it is preferable to cure the coating material by heat treatment after applying it to the base fabric. Common heating methods such as hot air, infrared light, and microwaves can be used to cure the coating material by heat treatment. From the viewpoint of production efficiency, it is preferable to use heat treatment using an oven.

[0043] The oven temperature is preferably set to 180°C or higher and 190°C or lower. By setting the curing temperature within this range, the coating material can be sufficiently cured. Furthermore, it is preferable to keep the temperature difference between the set temperature and the hot air drying temperature after the shrinkage process described above to 40°C or less. This temperature difference suppresses rapid shrinkage of the base fabric and, in addition, reduces the void ratio of the warp and weft cross-sections that make up the fabric.

[0044] 5. Applications of the present invention Airbags using the polyester base fabric for airbags of the present invention are suitably used, for example, in driver's side airbags, passenger side airbags, curtain airbags, side airbags, knee airbags, and seat airbags, as well as reinforcing fabrics. Therefore, these products are also included within the scope of the present invention. As for airbags using the airbag base fabric of the present invention, airbags requiring components that are long in the weft direction are particularly preferred because the coated base fabric for airbags of the present invention is less prone to misalignment after sewing when cutting components that are long in the weft direction. Specifically, side curtain airbags are preferred. Furthermore, as the coated base fabric for airbags of the present invention has excellent storage properties, airbags that require particularly good storage properties are also preferred. Specifically, driver's side airbags, passenger side airbags, and curtain airbags are preferred. As for airbags using the airbag base fabric of the present invention, airbags that require components that are long in the weft direction and that require good storage properties are more preferred. Specifically, side curtain airbags are more preferred. [Examples]

[0045] The present invention will be described in more detail below with reference to examples, but the present invention is not limited by the following examples, and it is certainly possible to implement it with appropriate modifications within the scope that is consistent with the spirit of the preceding and following descriptions, and all such modifications are included within the technical scope of the present invention. The various performance test methods used in the following examples are as follows.

[0046] <Weave density of the base fabric> The weave density of the base fabric was measured according to the method compliant with JIS L1096(2010)8.6.1. The sample was placed on a flat surface, and after removing any unnatural wrinkles and tension, the number of warp and weft threads was counted in 2.54 cm sections at five different locations. The average value for each was calculated per unit length and used as the weave density.

[0047] <Tensile strength of the base fabric> The tensile strength of the base fabric was measured according to the method conforming to JIS L1096(2010)8.12.1. Test specimens were prepared in both the warp and weft directions. Specifically, the test specimens were gripped in a tensile testing machine under an initial load, and the test was performed under the conditions of a specimen width of 50 mm, a gripping distance of 200 mm, and a tensile speed of 200 m / min, and the strength at break (N) was measured.

[0048] <Storage capacity of the base fabric> Measurements were taken according to the ASTM D6478 standard. Specifically, a test specimen with a width of 750 mm and a length of 800 mm was folded using the specified method, placed in a container with an inner bottom dimension of 100 mm x 150 mm, and tested at a speed of 25 mm / min. The bulk height was measured when various specified loads were applied from above. The volume under the measured load was calculated from the bulk height, and the sum of these values ​​was used as the measured value.

[0049] <Porosity> The void ratio of the warp and weft cross-sections constituting the fabric was calculated using the following method. (i) Three small samples were taken from the airbag base fabric, allowing observation of the warp and weft cross-sections. (ii) Cross-sections of the collected small pieces were photographed at 150x magnification using a scanning electron microscope (SEM) to capture both the warp and weft cross-sections. (iii) Photographs of each small sample were analyzed using image analysis software (ImageJ, manufactured by the National Institutes of Health, USA). (iv) The image was set to grayscale (8-bit image), and a threshold was set so that the void region between the warp or weft threads would appear black in the cross-section of the warp or weft threads (the area within the white solid line connecting the white rectangular points shown in Figure 1 or 2). The proportion of the void region in the cross-section of the warp or weft threads was calculated as the void ratio.

[0050] <Amount of coating material applied to the base fabric> The coated fabric after curing the resin was sampled exactly as a 5 cm square piece, and immersed in a solvent that dissolves only the fibers of the base fabric (hexafluoroisopropanol in the case of polyester fibers) to dissolve the base fabric. Next, only the insoluble silicone coat layer was collected, washed with acetone, vacuum-dried, and the sample was weighed. The coating amount is per 1 m 2 mass (g / m 2 ).

[0051] <Total Fineness of Raw Yarn> The total fineness of the raw yarn constituting the base fabric was measured by a method conforming to JIS L1013 (2010) 8.3.1. Specifically, a sample of exactly 90 cm in length was taken under an initial load, the absolute dry mass was measured, the corrected fineness (dtex) was calculated based on the following formula (2), and the average value of 5 measurements was taken as the total fineness.

Formula

[0052] (Example 1) Using polyester multifilament raw yarn with a fineness of 555 dtex / 200 f (single yarn cross-section is a round cross-section) for warp and weft, both the warp and weft were woven into plain weave at a set weaving density of 51 threads / 2.54 cm using a water jet loom, then passed through a hot water shrink tank without drying, and subsequently the base fabric was dried at a set temperature of 150 °C in a hot air dryer. Next, a solvent-free silicone resin composition with a resin viscosity of 18 Pa·sec was applied to one side of the aforementioned woven fabric by the knife-on-air method, with the coating amount adjusted to 20 g / m under the conditions in Table 1 2 . Further, curing treatment was performed at an oven set temperature of 190 °C to obtain a coated base fabric.

[0053] (Comparative Example 1) A coated base fabric was obtained under the same conditions as in Example 1, except that polyester multifilament yarn with a fineness of 555 dtex / 144 f (the cross-section of the single yarn is round) was used for the warp and weft threads, and the curing treatment was performed by setting the oven temperature after coating application to 200°C.

[0054] (Comparative Example 2) A coated base fabric was obtained under the same conditions as in Example 1, except that polyester multifilament yarn with a fineness of 555 dtex / 182f (the cross-section of the single yarn is round) was used for the warp and weft threads, and the curing treatment was performed by setting the oven temperature after coating application to 210°C.

[0055] Table 1 shows the manufacturing conditions for Example 1, Comparative Example 1, and Comparative Example 2, as well as the measurement results of the obtained coated base fabrics. [Table 1]

[0056] In Example 1, the tensile strength and packability of the base fabric in both the warp and weft directions were both at a high level, whereas in Comparative Examples 1 and 2, both the tensile strength and packability of the base fabric in both the warp and weft directions were inferior to those of Example 1. In Comparative Examples 1 and 2, the void ratio in the warp and weft cross-sections of the base fabric was higher than in Example 1. Therefore, it is thought that in Comparative Examples 1 and 2, the bending stiffness of the base fabric increased due to the increased thickness of the base fabric, resulting in a deterioration of the packability compared to Example 1. Similarly, it is thought that the high void ratio in the warp and weft cross-sections of the base fabric led to poor alignment of the constituent yarns in Comparative Examples 1 and 2, resulting in a deterioration of the tensile strength in both the warp and weft directions compared to Example 1. [Industrial applicability]

[0057] The present invention can be suitably used in polyester base fabrics for airbags, particularly in side curtain airbags where storage is important.

Claims

1. The total fineness of the warp and weft threads that make up the fabric is 550 dtex or more. A polyester base fabric for airbags, characterized in that the void ratio of the warp and weft cross-sections constituting the fabric is 2% or less.

2. Storage capacity: 2100 cm ３ The polyester base fabric for an airbag according to claim 1 is as follows:

3. The polyester base fabric for airbags according to claim 1 or 2, wherein the tensile strength in the warp and weft directions is 750 N / cm or more.

4. A polyester base fabric for an airbag according to claim 1 or 2, comprising polyester fibers with 196 or more filaments.

5. A polyester base fabric for an airbag according to claim 1 or 2, wherein the cover factor is 2200 or more and 2600 or less.

6. At least one side is coated with a silicone-based resin, and the amount is 5 g / m². ２ 50g / m or more ２ The polyester base fabric for airbags according to claim 1 or 2, which is as follows:

7. A method for manufacturing polyester base fabric for airbags, (a) The process of preparing the warp and weft threads and weaving them, (b) A process of shrinking the base fabric obtained by weaving and then drying it, Equipped with, A method for manufacturing a polyester base fabric for an airbag, characterized in that the number of filaments in the warp and weft threads prepared in step (a) is 196 or more polyester fibers.

8. Furthermore, (c) the process includes a step of distributing a silicone-based resin on at least one side of the woven base fabric, and then curing the silicone-based resin by heat treatment, A method for manufacturing a polyester base fabric for an airbag according to claim 7, wherein the temperature difference between the drying temperature in step (b) and the curing temperature in step (c) is 40°C or less.

9. A method for manufacturing a polyester base fabric for an airbag according to claim 7 or 8, wherein the curing temperature in step (c) is 180°C or higher and 190°C or lower.

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