KR20130142396A

KR20130142396A - Method of air-bag cover for motor vehicle

Info

Publication number: KR20130142396A
Application number: KR1020120065584A
Authority: KR
Inventors: 오우정; 김현돈; 전용
Original assignee: 현대모비스 주식회사
Priority date: 2012-06-19
Filing date: 2012-06-19
Publication date: 2013-12-30

Abstract

The present invention relates to a method for manufacturing a car airbag cover for injecting and coating a liquid urethane resin on a car airbag cover, the injection step of injecting a car airbag cover, a step of applying a release agent for applying a release agent on the mold inner surface, a release agent A cover mounting step of mounting a car airbag cover inside the mold to which the mold is coated, an injection step of injecting a liquid polyurethane resin into a mold equipped with the car airbag cover, and a car airbag coated with a liquid polyurethane resin It is a method of manufacturing an airbag cover for a vehicle comprising a demolding step of separating the cover from the mold. The manufacturing method of the airbag cover for a vehicle of the present invention can feel the texture similar to the leather wrap of the airbag cover applied to a luxury car and at the same time maintain the luxury inside the vehicle, the production process is shortened compared to the leather wrap process, manufacturing cost and manpower This provides a savings effect.

Description

Manufacturing method of airbag cover for vehicle {METHOD OF AIR-BAG COVER FOR MOTOR VEHICLE}

The present invention relates to a method for manufacturing a car airbag cover, and more particularly, to manufacture a car airbag cover for coating a car airbag cover with a urethane solution to reduce the cost, shorten the process and impart a sense of quality It is about a method.

A typical automotive airbag cover must have a soft and flexible surface and have sufficient mechanical properties that do not change shape in response to temperature changes and shocks inside the vehicle.

In addition, the airbag system is developed in such a way that when the shock occurs in the vehicle, the shock sensor detects this and the ignition agent is ignited to inflate the airbag so that the airbag cover is cracked and the airbag is released and expanded. Therefore, the cover must be deployed without debris so as not to injure the occupant upon inflation of the airbag, and the airbag can be released quickly.

In addition, when deployed at a low temperature of -35 ° C, the airbag module should tear open in the foreseen area of the cover and be free of shattering shatters. When the airbag module is deployed at a high temperature of 85 ° C., no deformation or peeling of the cover due to heat should occur.

Conventional automotive airbag covers have used thermoplastic elastomer (TPE) as a material for automotive airbag covers in order to satisfy the essential conditions of the airbag module as described above. In addition, since the feel of the occupant and the interior atmosphere of the vehicle vary according to the material used, the luxury vehicle has improved the luxury compared to the general vehicle by subjecting the thermoplastic elastomer to the leather wrapping process.

However, in the case of the leather wrapping process, there are many variations in physical properties such as tensile strength and tearing strength according to the direction of the applied leather, and the manufacturing cost increases because the leather must be manually wrapped and sewn in the manufacturing process. In addition, there is a fear that problems such as wrinkle wrinkles, sewing defects and uneven quality control by manual work. In addition, there is a problem in that a separate process such as applying an adhesive used in the leather wrapping process is added.

On the other hand, Korean Patent Laid-Open Publication No. 1994-7002805 discloses a vehicle airbag cover plate composed of a metal or a synthetic plastic. However, even with the above configuration, there is a limit that cannot be manufactured to reveal the luxury of the airbag cover.

SUMMARY OF THE INVENTION An object of the present invention is to provide a manufacturing method of a car airbag cover for shortening the production process by reducing the cost and manpower while maintaining a texture and high quality such as leather coating by thinly coating a car airbag cover with a urethane solution. To be.

Method for manufacturing a car airbag cover of the present invention for achieving the above object, the injection step for injecting a car airbag cover, a release agent applying step for applying a release agent to the mold inner surface, the inside of the mold coated with the release agent A cover mounting step of mounting the airbag cover, an injection step of injecting a liquid polyurethane resin into a mold equipped with a car airbag cover, and a demolding to separate a car airbag cover coated with a liquid polyurethane resin from a mold Characterized in that it comprises a step.

In addition, in the manufacturing method of the airbag cover for a vehicle according to the present invention, after the step of applying the release agent, a paint coating step of applying a paint to color the airbag cover for the vehicle inside the mold to which the release agent is applied. It is characterized by including.

In addition, the polyurethane resin of the method for manufacturing a vehicle airbag cover according to the invention is characterized in that it is formed by the reaction of a polyol, isocyanate and chain extender.

In addition, the polyol of the method for manufacturing an airbag cover for an automobile according to the present invention is characterized in that the material belongs to any one or more groups of polycarbonate-based, polyether-based and polyester-based.

In addition, the isocyanate of the method for manufacturing an automobile airbag cover according to the present invention is characterized in that the material belongs to any one or more of isophorone diisocyanate, hexamethylene diisocyanate, toluene diisocyanate and hexanediol diisocyanate.

In addition, the method of manufacturing an airbag cover for a vehicle according to the present invention is characterized by further adding a flame retardant to the polyurethane resin.

According to the present invention, by thinly coating a car airbag cover with a urethane solution, you can feel the texture of the airbag cover applied to luxury cars and at the same time maintain a sense of luxury inside the vehicle, production process compared to the leather wrapping process This shortening has the effect of reducing the manufacturing cost and manpower.

1 is a flow chart of a method of manufacturing an airbag cover for a vehicle according to the present invention.
Figure 2 is a schematic diagram showing a step-by-step method for manufacturing a vehicle airbag cover according to the present invention.

The present invention will now be described in detail with reference to the accompanying drawings.

1 is a flow chart of a manufacturing method of a vehicle airbag cover according to the present invention, Figure 2 is a schematic diagram showing a step-by-step method of manufacturing a vehicle airbag cover according to the present invention.

Method for manufacturing a car airbag cover according to the present invention is an injection step (S1) for injecting a car airbag cover, a release agent applying step (S2) to apply a release agent to the mold inner surface, to a car airbag cover inside the mold to apply the release agent Paint coating step (S3) for coating the paint to coat the color, cover mounting step (S4) for mounting the airbag cover for the car inside the mold applied mold release agent, injection step for injecting a liquid polyurethane resin into the mold ( S5), and the demolding step (S6) for separating the automotive airbag cover coated with a urethane resin from the mold.

First, in the injection step (S1) by injecting the airbag cover material in the same manner as in the prior art to produce the airbag cover 100. In this case, it is preferable to use a polyolefin elastomer (TPO) or a polyester elastomer (TPEE) material for the airbag cover material.

(a) Release agent in step (S2), the release agent is applied to the mold (200, 300) inside. This is to easily remove the completed airbag cover after completion of the manufacturing process of the airbag cover.

In the coating application step (S3), the coating is applied to the mold (200, 300). This is to color the airbag cover by applying paint before injecting the urethane resin. In addition, the use of aromatic urethane is to prevent the yellowing phenomenon occurring in the appearance of the product.

(b) In the cover mounting step (S4), the injected airbag cover is mounted between the upper mold 200 and the lower mold 300 of the mold. The upper mold 200 has an upper mold groove 210 having a shape similar to the upper portion of the injected airbag cover 100, and the lower mold 300 has a lower mold groove 310 having a shape similar to the lower portion of the injected air bag cover 100. This exists. In addition, when the airbag cover 100 is mounted inside the molds 200 and 300 and the molds 200 and 300 are closed, a fine space should remain around the airbag cover 100. This space is a space for introducing a liquid urethane resin.

(c) In the injection step (S5), the liquid urethane resin is injected through the injection hole 400 in a state in which the molds 200 and 300 on which the airbag cover 100 is mounted are closed. The injected liquid urethane resin flows into the mold through the injection hole 400 and is coated with a thin thickness around the mounted airbag cover 100.

The liquid urethane resin is formed by the reaction of the main polyol, the chain extender and the isocyanate as a curing agent.

The polyol which comprises a urethane resin can be used 1 type (s) or 2 or more types from the group which consists of a polycarbonate type, a polyether type, and polyester type.

As an isocyanate which comprises a urethane resin, 1 type, or 2 or more types can be used from the group which consists of isophorone diisocyanate, hexamethylene diisocyanate, toluene diisocyanate, and hexanediol diisocyanate.

The chain extender constituting the urethane resin reacts with the NCO of the isocyanate similarly to the polyol, thereby controlling the length of the urethane main chain so as to change the physical properties of the material to soft or hard.

That is, the segment formed by the reaction of isocyanate with polyol becomes a soft segment, and the segment formed by the reaction of isocyanate with a chain extender becomes a hard segment and exists simultaneously in one molecule. According to such molecular structure, polyurethane resin has both plastic properties (strength) and rubber properties (elasticity), which are peculiar properties. In addition, a flame retardant may be further added to the urethane resin in order to improve the flame resistance.

As such, the main body containing the polyol and the chain extender and the curing agent such as the isocyanate are mixed by using a mixer to be mixed at a constant ratio, and then the mold (200) through the inlet 400 before curing under a liquid and mold temperature of about 60 to 70 ° C. , 300). The injected liquid urethane resin is cured after about 1 to 2 minutes after application and is formed as a coating on the injected airbag cover 100 as a film.

(d) Finally, the demolding step (S6), the liquid urethane resin in the airbag cover 100 is cured to remove the airbag cover 110 coated like a film from the mold.

Thus, since the liquid urethane resin is injected directly to the airbag cover 100 is injected, a separate leather bonding process, such as the airbag cover of the conventional leather wrap specification is omitted, the process is shortened. In addition, since the urethane skin material is formed on the skin, it has an excellent effect such as embossing and touch quality than the existing general airbag cover.

As described above, an optimal embodiment has been disclosed in the drawings and specification. Although specific terms have been employed herein, they are used for purposes of illustration only and are not intended to limit the scope of the invention as defined in the claims or the claims. Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible from this. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

100: airbag cover 110: coated airbag cover
200: Pictograph 210: Pictograph groove
300: lower mold 310: lower groove
400: inlet

Claims

In the manufacturing method of a car airbag cover,
An injection step of injecting an automobile airbag cover;
A release agent applying step for applying a release agent to the mold inner surface;
A cover mounting step of mounting the vehicle airbag cover inside the mold to which the release agent and the paint are applied;
Injecting a liquid polyurethane resin into the mold in which the vehicle airbag cover is mounted; And
And a demolding step of separating the vehicle airbag cover coated with the liquid polyurethane resin from the mold.

The method according to claim 1,
After the release agent applying step, the method of manufacturing a vehicle airbag cover further comprising the step of applying a paint to color the vehicle airbag cover inside the mold to which the release agent is applied.

The method according to any one of claims 1 and 2,
The polyurethane resin is a method of manufacturing a car airbag cover, characterized in that formed by the reaction of polyol, isocyanate and chain extender.

The method according to claim 3,
The polyol is a method of manufacturing an airbag cover for a vehicle, characterized in that the material belonging to any one or more groups of polycarbonate-based, polyether-based and polyester-based.

The method according to claim 3,
The isocyanate is a method for producing an airbag cover for a vehicle, characterized in that the material belonging to any one or more of the group of isophorone diisocyanate, hexamethylene diisocyanate, toluene diisocyanate and hexanediol diisocyanate.

The method according to claim 3,
Method of manufacturing an airbag cover for a vehicle, characterized in that further adding a flame retardant to the polyurethane resin.