KR20020008423A - A manufacture methode of damping pad for car - Google Patents

Abstract

PURPOSE: A method for manufacturing a shock absorbing pad of a vehicle is provided to promote productivity by reducing the unit production cost and to improve the safety of a vehicle by minimizing the shock applied to the head of an occupant. CONSTITUTION: A method for manufacturing a shock absorbing pad of a vehicle comprises the steps of foaming the hanaclean of poly-styrene and poly-ethylene at a proper ratio on respective parts of a vehicle(ST1); injecting the foam particles by injecting in a form matching with the part of a vehicle(ST2); and reinforcing the shock absorbing property of the form by drying(ST3). The shock absorbing pad is installed on such parts as an A-pillar, a B-pillar, a C-pillar, a roof panel, a door, and a headline. The shock absorbing panel protects the human body of a driver and an occupant including the head in an accident. Therefore, the safety is maximized.

Description

Manufacturing method of cushion pad for automobile {A MANUFACTURE METHODE OF DAMPING PAD FOR CAR}

The present invention relates to a shock absorbing pad to be mounted on a vehicle body, and more particularly to a shock absorbing part that can protect each element of a car, in particular, a passenger's head by using a member of a styrofoam. By providing a manufacturing method to improve the stability of the vehicle and at the same time to improve the productivity of the product.

In recent years, due to the development of the performance of the car and the improvement of the pavement of the road, the driving speed of the car is gradually increased, thereby causing a fatal injury to the heads of drivers and passengers when a car crash occurs. The trend is increasing.

However, as the demand for automobiles increases, it is pointed out that measures for the safety of drivers and passengers are inadequate compared to efforts to enhance the driving performance and appearance of automobiles.

That is, when another car collides with the side of the car, the head of the occupant may be injured by colliding with the car body, and in recent years, regulations on the safety of the occupant in each country are tightened.

Meanwhile, recently, polyolefin-based foam sheets having excellent moldability and excellent flexibility and heat insulating properties have been used as automotive interior materials, such as head liners, door trims, and instru- ment panels among automotive interior materials. In order to mold things such as head liners, door trims, and the like, molding is carried out using vacuum molding, compression molding, and stamping molding, and the molding temperature is usually a high temperature of about 120 to 200 ° C.

However, in the related art, polyethylene (PE) -based foams or polypropylene (PP) -based foams for general molding have been used as polyolefin foam sheets, and they are not used in a mold stamping method requiring high temperature molding because of their low heat resistance. Therefore, in recent years, the need for polyolefin-based foams containing a high strength, high melting point polypropylene resin suitable for high temperature molding as a main component is increasing rapidly.

Moreover, in the case of the integral molding method or the stamping mold method among the methods for molding automotive interior materials, a high temperature base material made of wood stock or low pressure polypropylene resin that is 120 to 200 ° C. of the substrate is used. When the polypropylene foam in which the skin material such as PVC, TPO, cloth, etc. is laminated and the high temperature base material are laminated by the high pressure press between the upper mold and the lower mold, the conventional polypropylene foam is weak in heat resistance, Since the thickness is reduced in the layer direction or the bubbles of the foam are broken, as a result, irregularities are generated on the surface of the interior material, which results in a poor appearance.

As a means for solving this problem, although a low magnification foam may be used, the low magnification foam has a problem in that the advantage of the foam is lowered because it is insufficient in bufferability and flexibility.

In addition, in the case of the conventional automobile interior material, as a conventional automobile interior material, the laminated body which laminated | stacked the skin materials, such as PVC, cloth, TPO sheet, a polyolefin foam, and base materials, such as woodstock, was used. However, since the polyolefin-based foams used in the prior art are not capable of high temperature molding due to poor heat resistance as described above, there are various limitations in terms of production cost and productivity in manufacturing automobile interior materials using a stamping method or the like.

Accordingly, the present invention has been proposed to solve the above problems in the prior art, and has an object to provide a method for manufacturing a shock absorbing pad for an automobile, while reducing manufacturing cost and improving productivity and physical properties.

The present invention for realizing the above object, in the manufacture of a shock absorbing pad to be mounted inside each panel of the interior of the vehicle to perform a buffer action,

Foaming step of primarily foaming the raw material;

A molding step of supplying the foamed foam lip to a mold suitable for a foam of a position to be mounted to form a predetermined shape; And

The drying step for reinforcing the buffering force of the molded cushioning material; can be achieved through a method for manufacturing a cushion pad for a vehicle, characterized in that it comprises a.

1 is a process flow diagram for the buffer pad manufacturing of the present invention.

Figure 2 is a schematic diagram of the foaming process of the raw material for the primary foaming of the present invention.

Figure 3 is a state diagram at the time of molding the foamed foam.

Figure 4 is an excerpt of the main part showing a state in which the shock absorbing pad of the present invention is mounted on the parts of the vehicle.

<Description of the reference numerals for the main parts of the drawings>

1: CORE mold 2: Cavity mold

3: Raw material supply part 4: Eject pin

Hereinafter, specific embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

The manufacturing method for manufacturing the buffer pad of the present invention is largely made in three steps as shown in FIG.

That is, the foaming step of foaming at the most suitable magnification for each part of the vehicle using the raw material of PS (Poly-styrene) and PE (Poly-ethylene), which are general styrofoam, as raw materials (ST 1), and The foamed foam lip is injected into a mold suitable for the same form (Form) as a certain amount of automobile parts, and a molding step (ST 2), and a drying step (ST 3) to reinforce the cushioning of the molded product.

2 is a view showing a polymerization state of raw materials for performing the foaming step.

Figure 3 shows the configuration for performing the molding step, the raw material supply unit 3 for supplying the foam granules between the core mold (1) and the cavity mold (2) forming a space of a predetermined shape as shown Is provided, a plurality of eject pins (4) is installed through the cavity mold (2) to perform the removal of the molded article.

Each process will be described in more detail below.

First, the primary foam granules as raw materials of the new physical properties in the present embodiment is made of PE + PS as described above, in which the polymerization amount of each component is adjusted according to the magnification of each component to maximize its physical properties. Will be.

In addition, in the molding step, it is preferable to use the prepared primary foam granules for a certain period of time (about 5 to 9 days). It is put in a mold and the shape is completed.

That is, as shown in FIG. 3, when the foam HANACELAN is supplied from the raw material supply part 3 between the two molds 1 and 2 forming the internal space of a predetermined shape and filled in the space, steam and Cooling water is supplied so that the foam lip is completely in contact with the inner space. After the buffer pad is completed through this process, the core mold (1) is separated from the cavity mold (2), and the eject pin (4) pushes the molded product to help the separation from the cavity mold (2). As a result, a buffer pad having a predetermined shape is completed.

At this time, the important point in the molding step is the time of steam and cooling for molding the raw materials injected into the foam. This is because steam and cooling have the basic characteristics as a cushion pad for automobiles as a first step for forming a raw material that is injected into a mold having the same shape as a vehicle component to be mounted.

In the drying step, the shock absorbing pad is manufactured by reinforcing the rigidity and flexibility of the completed car shock absorbing pad as described above, wherein the internal temperature of the space to be dried is always maintained between 60 ° C. and 70 ° C. Preferably, the drying time should be about 1 hour 30 minutes to 2 hours.

As shown in FIG. 4, the automobile cushion pad 5 manufactured through each process described above is a variety of automobiles such as A-pillar, B-pillar, C-pillar, roof panel, door, headline, etc. It is to be mounted inside the component (6), this buffer pad serves to protect the human body to the maximum, including the head of the driver and the occupant in the event of a car accident.

In other words, it is possible to maximize safety in case of an accident by being mounted on the part of the car which is most impacted on the occupant's head during an external shock (especially when impacting from the side). It is.

In addition, although specific embodiments of the present invention have been described above, it is obvious that the method of manufacturing the buffer pad of the present invention may be variously modified and implemented by those skilled in the art.

For example, in the above embodiment, the foaming agent used a polymer of PE and PS, but besides, a foam pad may be manufactured by foaming a material such as Expandable Polyethylene (EPE) or Expandable Poly propylene (EPP), and the body of the pad. Applicable parts can also be installed and installed in various necessary areas.

Therefore, such modified embodiments should not be understood individually from the technical spirit or the prospect of the present invention, and such modified embodiments should fall within the appended claims of the present invention.

As described above, the buffer pad of the present invention can contribute to productivity improvement by greatly reducing the manufacturing cost of a product by manufacturing raw materials such as copolymers through foaming, molding, and drying processes.

In addition, the shock absorbing pad manufactured in this way and installed in the vehicle body has an advantage of minimizing the impact on the occupant's head when an accident occurs in the vehicle, thereby having a great effect on safety.

Claims (4)

In manufacturing a shock absorbing pad which is mounted inside each panel of the vehicle interior and performs a shock absorbing action, (1) foaming the primary foaming material; (2) a molding step of supplying the foamed foam lip to a mold suitable for a foam of a position to be mounted to form a predetermined shape; And (3) a method for manufacturing a shock absorbing pad for a vehicle, comprising: a drying step for reinforcing a buffering force of the molded cushioning material. The method according to claim 1, The raw material is a cushion pad manufacturing method of a vehicle, characterized in that the copolymer of PE and PS is used. The method according to claim 1, The raw material is a cushion pad manufacturing method of a vehicle, characterized in that EPE or EPP is used. The method according to claim 1, The drying step is a method for manufacturing a cushion pad for a vehicle, characterized in that for drying for 90 minutes to 120 minutes while maintaining the drying space temperature of the molded cushioning material at 60 ~ 70 ℃.