JPH0643074B2 - Manufacturing method of automobile interior parts - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION << Industrial Application Field >> The present invention relates to a method for manufacturing automobile interior parts such as a door trim for an automobile, and particularly, to improve the soft feeling of the product surface and The present invention relates to a method for manufacturing an automobile interior part that promotes shortening.

<Prior art> For example, various interior parts are mounted in the interior of an automobile, but the interior parts must be made of fiberboard, resin board, etc. that have shape retention and mounting rigidity to the vehicle body panel. There is generally known a laminated structure in which a core material formed into a shape and a skin material having a cushioning property and a decorative property are laminated on the surface side of the core material.

By the way, the disadvantages of the core material made of fiberboard, resin board, etc. are that it is heavy and does not match the weight reduction of the product, and it is not satisfactory in terms of moldability as well. However, there is a problem in that it cannot be easily applied to products equipped with.

As a countermeasure against this, it has been proposed and practiced to use a cured urethane reinforced with a glass mat or the like as a core material to promote weight reduction and improve moldability.

FIG. 7 is a cross-sectional view showing the structure of an automobile door trim using a hard urethane core material. This automobile door trim 1 is molded into a required shape and has a glass mat 2 inside as a hard urethane core material. 3 and a skin material 4 attached to the surface side thereof.

An outline of the manufacturing process of the door trim 1 will be described. As a commonly used method, as shown in FIG. 8, after the glass mat 2 is set on the foam molding lower mold 5, the foam molding lower mold is set. Hard urethane resin liquid is injected into the mold 5, and the upper mold for foam molding (not shown) is closed with respect to the lower mold 5. After the mold is clamped, the hard urethane resin liquid is foamed and hardened to form the hard urethane core material 3 Although not shown, the skin material 4 which has been molded separately is pressure-bonded and integrated with the hard urethane core material 3 with an adhesive agent, though not shown, to complete the manufacture of the door trim 1.

As yet another method, as shown in FIG. 9, the skin material 4 that has been molded in advance is set on the wall surface of the lower mold 5 for foam molding, and the glass mat 2 is set from the upper side thereof to perform foam molding. A hard urethane resin liquid is poured into the lower mold 5 to mold the hard urethane core material 3 and the hard urethane core material 3 and the skin material 4 are integrated, and the steps are different from the former method. This is a shortened method.

<< Problems to be Solved by the Invention >> However, in the method for manufacturing an automobile interior part using the conventional hard urethane core material 3 described above, first,
In the former method, since the hard urethane core material 3 and the skin material 4 are separately molded, and the hard urethane core material 3 and the skin material are bonded and integrated with a pressure-bonding die, many manufacturing steps are required. In addition, it has been pointed out that there is a drawback in that it causes a large increase in cost such as a large-scale manufacturing facility.

Further, in the latter manufacturing method, since the hard urethane core material 3 and the skin material 4 are integrally molded, the process can be shortened, but it is affected by the foaming pressure of the hard urethane resin liquid during the foaming reaction of the hard urethane resin liquid. If a soft material is selected as the skin material 4, unevenness will occur on the surface of the skin material 4 after molding, so it is necessary to select a material having a relatively high hardness as the skin material 4, and the surface feel of the product is poor. That problem has been pointed out.

The present invention has been made in view of such circumstances, and an object of the present invention is to significantly shorten the manufacturing process in a method of manufacturing an automobile interior part using a hard urethane core material. In addition, it is possible to provide a method for manufacturing an automobile interior part that enables the use of a soft skin material and remarkably improves the surface feel of the product.

<< Means for Solving the Problem >> In order to achieve the above-mentioned object, the present invention is on the mold surface of the foam molding lower mold, and after being set so as to be in close contact with the surface side of the skin material, the back surface side of the skin material A step of applying an adhesive, a step of placing a pad material obtained by backing a non-air-permeable urethane film on a soft urethane, and a glass mat on the back surface side of the skin material, in the foam molding lower mold, By injecting a hard urethane resin liquid, closing the upper mold for foam molding with respect to the lower mold for foam molding, and foam-hardening the hard urethane resin liquid,
It is characterized in that a hard urethane core material having a glass mat as an inner layer, a pad material and a skin material are integrated.

<< Operation >> As is apparent from the above configuration, according to the method of the present invention,
Since the rigid urethane core material and the skin material can be integrated at the same time when the rigid urethane core material is molded, the manufacturing process can be significantly shortened.

Furthermore, since the foaming pressure is buffered by the pad material during the foaming reaction of the hard urethane resin liquid, the skin material itself is not affected by the foaming pressure of the hard urethane resin liquid, so that a soft skin material can be used. .

<Example> Hereinafter, an example of the method of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a sectional view showing the structure of an automobile door trim manufactured by applying the method of the present invention, FIGS. 2 to 5 are sectional views showing each step of the method of the present invention over time, and FIG. It is sectional drawing which shows another Example of the 1st process of an invention method.

First, an automobile door trim 1 obtained by applying the method of the present invention
0 will be described with reference to FIG. 1. This automobile door trim 10 includes a hard urethane core material 12 having a glass mat 11 as an inner layer, a pad material 13 integrated on the surface side of the hard urethane core material 12, and a skin material. It is composed of 14 and.

Further, as the pad material 13, a soft urethane 16 laminated with a non-air-permeable urethane film 15 is used, and as the skin material 14, a slush skin layer 17 is provided on the front surface side and a slush foam layer 18 is provided on the back surface side. Skin material 14 laminated by slush molding
Is used.

Next, a manufacturing process of the automobile door trim 10 will be sequentially described.

First, as shown in FIG. 2, the skin material 14 is set on the mold surface of the foam molding lower mold 20, and the adhesive 22 is coated on the upper surface side by the spray gun 21.

Next, as shown in FIG. 3, the pad material 13 and the glass mat 11 are placed on the upper side of the skin material 14, respectively. The pad material 13 is placed with the urethane film 15 on the upper side, which is not shown. It is preferable that the pad material 13 and the glass mat 11 are set in a state in which their peripheral edges are held by a clamp device or the like and a little tension is applied.

Then, as shown in FIG. 4, the nozzle 23 of the foam molding machine is used.
After injecting the hard urethane resin liquid 24 into the mold of the foam molding lower mold 20 and injecting a predetermined amount of the hard urethane resin liquid 24, the foam molding upper mold 25 is used for foam molding as shown in FIG. The lower mold 20 is closed to cause the foaming reaction of the hard urethane resin liquid 24 in these foam molding upper and lower molds 20 and 25.

At this time, the foaming pressure of the hard urethane resin liquid 25 is about 2 kg / cm ²
The foaming pressure causes skin material 14 and pad material 1
3 is firmly pressure-bonded and integrated with an adhesive 22.

Further, the hard urethane core material 12 is molded by hardening the hard urethane resin liquid 24.
Since the pad material 13 and the pad material 13 are firmly bonded by the compatibility between the urethane film 15 and the hard urethane core material, as a result, the hard urethane core material 12, the pad material 13, and the skin material 1
4 and the three are firmly integrated.

Then, after opening the foam molding upper mold 25, if the product is taken out from the foam molding lower mold 20, the soft urethane 16 constituting the pad material 13 is restored, and the slush foam layer 18 of the skin material 14 has cushioning properties. Synergistically, a good soft feeling can be obtained.

Thus, according to the method of the present invention, the hard urethane core material 12
Since the hard urethane core material 12 and the skin material 14 can be integrated with each other via the pad material 13 at the same time as molding, the process can be significantly shortened, and the foaming pressure can be reduced during the foam molding of the hard urethane resin liquid 24. Since it can be effectively absorbed by the soft urethane 16 and the urethane film 15 can prevent the hard urethane resin liquid 24 from penetrating into the soft urethane 16, there is no unevenness on the product surface even when a soft skin material is used. Does not occur.

Next, FIG. 6 shows another embodiment of the method of the present invention. Instead of molding the skin material 14 in advance as in the above-mentioned embodiment, the surface 20a of the foam molding lower mold 20 is molded. The vacuum suction hole 26 is set in advance, and a skin material 27 such as foamed PVC is used.
Is preheated and softened and vacuum-molded by the foam molding lower die 20, and then a door trim for an automobile may be produced through the same steps as those in the above-described embodiment. According to this embodiment, the skin material 2
No additional equipment for molding 7 is required, and further cost reduction is possible.

<< Effects >> As is apparent from the above description, the method for producing an automobile interior part according to the present invention has the following special operational effects.

According to the method of the present invention, since the skin material is integrally molded via the pad material during foam molding of the hard urethane core material, the process is significantly larger than the conventional method requiring foam molding and crimping process. In addition to being shortened, the equipment is also simplified, which has the effect of significantly reducing the cost.

According to the method of the present invention, the skin material is integrated through the pad material during the foam molding of the hard urethane core material, and the pad material is a laminate of the non-air-permeable urethane film and the soft urethane. Therefore, the hard urethane resin liquid does not penetrate into the soft urethane due to the barrier action of this urethane film, and the soft feeling of the soft urethane is not impaired. It has the effect that a certain product can be provided.

According to the method of the present invention, the skin material is integrated through the pad material during the molding of the hard urethane core material, and during foam molding of the hard urethane core material, the foaming pressure is effectively absorbed by the pad material, Since the skin material itself is not adversely affected by the foaming pressure, even if a soft skin material is used, the product surface does not have irregularities, and the flexibility of selecting the skin material is dramatically increased. .

[Brief description of drawings]

FIG. 1 is a sectional view showing the structure of an automobile door trim manufactured by applying the method of the present invention, FIGS. 2 to 5 are sectional views showing the steps of manufacturing the automobile door trim, and FIG. 6 is the present invention. Fig. 7 is a cross-sectional view showing another embodiment of the step of setting the skin material in Fig. 7, Fig. 7 is a cross-sectional view showing the constitution of a conventional automobile door trim, and Figs. 8 and 9 are explanations of a conventional method for producing an automobile door trim. It is each sectional view. 10 ... Automobile door trim 11 ... Glass mat 12 ... Hard urethane core material 13 ... Pad material 14 ... Surface material 15 ... Urethane film 16 ... Soft urethane 20 ... Foam molding lower mold 22 ... Adhesion Agent 24 …… Hard urethane resin liquid 25 …… Upper mold for foaming 26 …… Vacuum suction hole 27 …… Surface material

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display location B29L 31:58 4F

Claims (2)

[Claims] 1. A foam molding lower mold (20) is set so that the front surface side of a skin material (14) is in close contact with the mold surface, and then an adhesive agent (22) is applied to the back surface side of the skin material (14). And a step of applying a soft urethane (16) on the back surface side of the skin material (14).
A step of placing a pad material (13) backing a non-air-permeable urethane film (15) and a glass mat (11), and a hard urethane resin liquid (24) in the foam molding lower die (20). ) Is injected, the upper mold (25) for foam molding is closed with respect to the lower mold (20) for foam molding, and the hard urethane resin liquid (24) is foam-cured to form the glass mat (11) as an inner layer. A method for manufacturing an automobile interior part, characterized in that the hard urethane core material (12), the pad material (13) and the skin material (14) are integrated. 2. The foam molding lower mold (20) is provided with suction holes (26) on the mold surface thereof, and the skin material (27) is vacuum-molded, whereby the foam molding lower mold (20) is molded on the mold surface. Skin material (2
7. The method for producing an automobile interior part according to claim 1, characterized in that (7) is closely held.