KR19990042506A - Manufacturing method of nylon fabric for airbag of automobile - Google Patents

Abstract

The present invention is a method of manufacturing a nylon fabric for airbags of automobiles having excellent flexibility and storage ability and having a ventilation of 1cc / cm ² / sec or less, and is a method of manufacturing a simple manufacturing process without coating and without calendering.

The present invention is a method of manufacturing a polyamide multifilament yarn having a single yarn fineness of 3 to 4 denier and a non-shrinkage ratio of 8% or more by refining at 100 to 130 ° C, drying and heat setting at 100 to 150 ° C.

Description

Manufacturing method of nylon fabric for airbag of automobile

The present invention relates to a method for producing a nylon fabric for an airbag of an automobile, in particular a nylon fabric without coating.

Automotive airbags are required heat resistance, flame retardancy, air barrier properties and flexibility, in particular proper ventilation and flexibility is a very important factor.

Conventionally, a method of coating silicone or synthetic rubber is widely used as a method of controlling air permeability.

That is, in Japanese Patent Laid-Open No. 49-47692, chloroprene rubber containing a small amount of zirconium compound was coated on a nylon fabric, and in Japanese Patent Laid-Open No. 2-185843, a silicone rubber was coated on a nylon fabric. However, such a coating fabric has a disadvantage in that the manufacturing cost is higher than the non-coating fabric and the fabric itself is rough and heavy so that the storage property is bad when it is mounted on a vehicle. For example, the containment space required to fold an airbag into a steering wheel is 10-20% larger than that of an uncoated fabric.

For this reason, the following various methods have been proposed to manufacture non-coated airbags. EP 314867 regulates the air permeability of the fabric through continuous shrinkage and heat setting and calendar ring. However, this method has the disadvantage of going through a very expensive calendaring process, and the configuration of theodolite is different, which is not suitable for the needs of automakers requiring the same strength in both directions. In Japanese Patent Laid-Open No. 4-281062, single yarn fineness was shrunk and heat-set using nylon 66 yarn of 4 denier or more to have a low air permeability, but the processed fabric is slightly stiff, which has a disadvantage of poor storage and flexibility.

The present invention solves the problems of the prior art as described above, by combining the appropriate selection of the yarn to be used and the refining and heat-setting conditions for the purpose of providing a non-coated nylon fabric for airbags of the airbag of the vehicle having a good ventilation and good flexibility The purpose is to provide a method that can be easily manufactured.

The present invention is described in detail as follows.

In the present invention, a nylon multifilament yarn having a fine fineness of 3 to 4 deniers and a total fineness of 200 to 600 deniers was used.

More specifically, 420 denier / 110 filament (single fineness 3.8 denier), 420 denier / 136 filament (single fineness 3.1 denier), 315 denier / 102 filament (single fineness 3.1 denier), and 210 denier / 68 filament ( Single yarn fineness 3.1 denier) yarn was used.

If the single yarn fineness exceeds 4 denier, the softness of the fabric is lowered and it does not satisfy 1.0cc / cm ² / sec or less required as an airbag even in aeration (Comparative Example 4). Disorders such as weft and weft have the disadvantage of degrading the quality of the fabric. (Comparative Example 5)

In addition, the nylon multifilament yarn used in the present invention has a non-shrinkage ratio of 8% or more.

If the non-shrinkage ratio is less than 8%, sufficient heat shrinkage does not occur during refining and heat setting, and thus it is difficult to obtain the desired aeration.

In order to stabilize the quality of the dough during weaving, it is preferable to perform sizing in the preparation process. However, the excessive amount of adhesive attached to the inclined surface will stick to the body during weaving, which may cause deterioration of quality. Also, the proper amount may be contaminated due to the scattering of the powder caused by strong body needles. good.

Weaving looms for weaving fabrics for airbags are generally available for various types of weaving machines, such as water jet looms, air jet looms, and repias. Recently, however, the use of air jet looms has been actively considered due to productivity.

Woven fabric needs to remove contaminated impurities during weaving and weaving or rolling. Airbag fabric is composed of yarn-free yarn and the density of the fabric is easy to receive wrinkles during the process, so care should be taken in refining. In general, as in the refining of nylon fabrics, a number of refining machines such as atmospheric weaving, high-pressure weaving, boyleoff or continuous refining can be used, and a washing process for removing the refining agent is necessary after refining. In the present invention, the airbag fabric was refined using the normal pressure weaving fabric and the high pressure weaving fabric, and both of them attached a device for separately adjusting the tension to minimize the tension on the fabric in order to prevent wrinkles caused by rolling in the refiner. Was used. In addition, to keep the surface speed of the fabric uniformly attached to the device included. In the refining solution heated to a high temperature, the fabric shrinks as much as the non-shrinkage rate of the yarn as known, thereby obtaining the desired density of the processed paper. At this time, the shrinkage caused by refining is performed within the shortest possible time to reduce the characteristics of the airbag fabric and reduce the manufacturing cost. The high-pressure weaving can be adjusted from the outside to control the temperature inside. In general, the high-pressure weaving yarn is used in a high temperature range of 130 to 140 ℃ for dyeing the polyester fabric, the airbag fabric is a nylon temperature is slightly lower than this because it is used. In this invention, the objective of this invention was achieved by making refining temperature 100-130 degreeC.

If the refining is less than 100 ℃, the yarn shrinkage rate cannot be sufficiently exerted to increase the density of the warp yarn, and the air permeability can not be obtained. (Comparative Example 1) The refining temperature exceeds 130 ℃. This causes the yarn to shrink, resulting in excessive density. In addition, overexposure at high temperature causes yellowing of the yarn, deterioration of the product, and stiffness of the fabric, resulting in a significant decrease in air permeability (Comparative Example 2).

In the present invention, heat setting is generally performed using a pin tenter or S-tenter for drying and heat setting of a refined fabric.Typsum fabrics such as airbag fabrics are generally 20 to 50 m depending on the equipment. The setting is made at the rate of / minute. Heat setting temperature at this time is 100-150 degreeC is good. Below 100 ℃, it is difficult to remove moisture absorbed by nylon during refining completely and quickly, and when it exceeds 150 ℃, nylon filament becomes stiff due to high temperature exposure, resulting in poor ventilation. )

Examples 1-4

Slanted beams were fabricated using four kinds of nylon 66 yarns with single yarn fineness of 3.1 denier, total fineness of 420, 315, 210 denier, and single yarn fineness of 3.8 denier, and total fineness of 420 denier. The amount of arc adhesion at this time was 3.0 to 3.5% with respect to the weight of the yarn. We prepared the inclined beams by using two sheets of body, and then weaved them on a Toyota Air Jet Weaving Machine. In order to obtain a high-density fabric with an air nozzle-attached air jet loom, the warp tension was adjusted to about 450 kg level slightly higher than that of the general nylon fabric, and weaving was performed at 600 rpm. The density of the woven dough was measured at 52x52, 58x58, and 64x64 for each denier of yarn used. Weaved dough was inspected using a checker and the results were evaluated for weaving. After the prepared dough was prepared using a high-pressure weaving solution, the temperature was fixed to 110 ° C., and then refined and washed with overflow. Washed refined paper was dried and heat set with a residence time of 2 minutes using a fin tenter at 140 ° C to obtain a fabric for an airbag of the present invention. The theodolite density, air permeability, and flexibility of the fabric thus prepared were measured and the results are shown in Table 1.

division Example 1 Example 2 Example 3 Example 4 Yarn fineness (denier / filament) 420/136 420/110 315/102 210/68 Single yarn fineness (denier) 3.1 3.8 3.1 3.1 Specific Water Shrinkage (%) 8.6 8.6 8.8 8.7 Processing paper density (diameter x top, bone / inch) 56 x 56 56 x 56 63 x 63 70 x 70 Aeration degree (cc / cm ² / sec) 0.4 0.45 0.3 0.35 Refinement Processing (℃) 110 110 110 110 Drying & Heat Setting (℃) 140 140 140 140 Weaving Good Good Good Good flexibility Good Good Good Good

As can be seen from Table 1, it can be seen that in the case of Examples 1 to 4, all of satisfactory results such as the level of air permeability, weaving and flexibility required as the non-coating fabric for airbags were obtained.

Comparative Examples 1 to 6

In order to compare Examples 1 to 4, the refining temperature was set at 95 ° C in Comparative Example 1, the refining temperature was set at 135 ° C in Comparative Example 2, and the drying and heat setting temperatures were set at 180 ° C in Comparative Example 3, and the results are compared in Table 2. It was. In Comparative Examples 1 to 3, the refining or heat setting temperature was not appropriate, resulting in insufficient density and insufficient air permeability. Comparative Examples 4 and 5 have different single yarn fineness, and when single yarn fineness exceeds 4 denier, air permeability and flexibility are insufficient, and when single yarn fineness is less than 3, weaving property is insufficient. In Comparative Example 6, 420 denier 136 filament yarn of nylon 66 having a non-shrinkage rate of 6% was used. The processing process was the same as that of Example 1, the density was less than the standard and the ventilation was also insufficient.

division Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Yarn fineness (denier / filament) 420/136 420/136 420/136 420/70 420/168 420/136 Single yarn fineness (denier) 3.1 3.1 3.1 6.0 2.5 3.1 Specific Water Shrinkage (%) 8.6 8.6 8.6 8.6 8.6 6.0 Machining density (diameter x top, bone / inch) 54 x 54 58 x 58 56 x 56 56 x 56 56 x 56 54 x 54 Aeration degree (cc / cm ² / sec) 1.5 2.8 3.9 1.2 0.3 1.8 Refinement Processing (℃) 95 135 110 110 110 110 Drying & Heat Setting (℃) 140 140 180 140 140 140 Weaving Good Good Good Good Inadequate Good flexibility Good Defective Defective Inadequate Good Good

How to measure ;

Breathability: KS K 0570 Prazia test method at 125 Pascals

Was carried out.

Weaving: Visually inspect the fabric dough and classify it into the following four grades according to the number of defects. Of these, grade A and B are considered good, grade C is insufficient and grade D is poor.

A: 0 defects / 100yds

B: 1 to 2 defects / 100yds

C: 3-8 defects / 100yds

D: 9 defects / 100yds

Flexibility: KS K 0538 ductility test method (cantilever method)

In evaluating each flexibility, required as an airbag

6cm or less is good, 6-8cm is insufficient, and 8cm or more is evaluated as bad.

The nylon fabric for automobile airbag manufactured according to the present invention has an air permeability of 1.0cc / cm ² / sec or less, which is suitable for airbags of automobiles, and at the same time, it has excellent flexibility and thus has excellent storage properties.

In addition, the present invention does not require a coating and does not require a calendering process, there is an advantage that can be produced inexpensive nylon fabric for airbags with only a very simple manufacturing process.

Claims (1)

Fabrication of nylon fabric for airbags for automobiles, characterized in that the non-shrinkage is more than 8% and single yarn fineness of 3 to 4 denier fabrics of nylon multifilament yarn is refined at 100 to 130 ℃ and heat set at 100 to 150 ℃ Way.