JPH02254018A - Interior part for automobile - Google Patents

Abstract

PURPOSE:To keep good soft feeling and surface smoothness of products by forming facing material, stuck integrally onto the surface of a core material, with a skin layer, a foaming layer, and a solid layer for stopping transmission of heat from the core material to the foaming layer and transmitting pressing force to the core material. CONSTITUTION:A door trim 10 for automobile is composed of a core material 11 formed in a desired shape and a facing material 12 stuck integrally onto the surface of the core material 11 by means of press molding. In this case, the facing material 12 is laminated with a skin layer 13, a foaming layer 14, a solid layer 15, and a foaming layer 16 in order, to form four-layer construction. Also, a ground fabric 17 such as knitted fabric, etc., is laminated on the underside of the foaming layer 16, i.e., on the surface opposite to the core material 11, so as to increase adhesiveness. Heat in the core material 11 is stopped to be transmitted to the foaming layer 14 and pressing force is transmitted directly to the core material 11 by the use of the solid layer 15. Thus, the cells of the foaming layer 14 are prevented from being broken and the uneven surface of the core material 11 is suppressed from being produced.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to interior parts for automobiles such as automobile door trims and rear corner trims, and particularly relates to automobile interior parts such as automobile door trims and rear corner trims. The present invention relates to automobile interior parts obtained by the present invention.

(Prior art) Interior parts that are installed on the inner surface of an automobile body panel are usually made of a core material with excellent rigidity and a core material that is attached to the surface side of this core material in consideration of shape retention and attachment to the vehicle body panel. A laminated structure with a skin material attached that provides decorative and cushioning properties is common.

4 and 5, to explain the conventional example of forming this type of interior parts by press molding, first, the core material 1
Considering cost, moldability, strength, etc., polypropylene resin or a material made of polypropylene resin mixed with wood powder filler, etc. is extruded into a sheet shape.
′ is drawn by cold press molding,
Core material 1 is molded. At the same time as this core material 1 is formed, a skin material 2 is integrally attached to the surface side of the core material 1. As the skin material 2, a foamed PVC sheet is used as shown in FIG. ing. This foamed PVC sheet has a dense cell structure on the surface side, giving it a smooth surface feel.

It has an excellent surface appearance, and has a structure in which the cells become larger and the density becomes smaller toward the inner depths, and it consists of a so-called dense skin layer 3 and a foam layer 4 with cushioning properties.

Then, after placing the heated and softened sheet 1'' on the mold surface 5a of the lower mold 5 for cold press molding, the skin material 2 is set from above, and the upper mold 6 for cold press molding is lowered. Due to the predetermined clearance between the upper and lower cold press molds 5 and 6, the core material 1 is drawn into a desired shape and at the same time the core material 1 and the skin material 2 are integrated.

(Problem to be solved by the invention) However, when the core material 1 and the skin material 2 are integrated using the conventional simultaneous press method, it is difficult to prevent the influence of heat from the core material 1 during press forming. The foam layer 4 becomes molten and compressed by the press pressure.
The inner cells are destroyed, and the foam layer 4 is no longer restored after molding, and the thickness of the skin material 2, which was 2 to 3 mm before molding, becomes 1 to 1.5 mm after molding. It has been pointed out that there are problems in which the elasticity is reduced by half, the soft feel is lost, and the cushioning function is significantly reduced.

Furthermore, since the foam layer 4 of the skin material 2 is relatively thick, the press pressure during press molding is buffered, and the sheet 1-
cannot be drawn faithfully to the mold surface 5a of the press mold 5, and unevenness occurs in the core material 1. It has also been pointed out that these irregularities also appear on the surface of the product, resulting in extremely poor surface smoothness and deterioration of the appearance design.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an interior part for an automobile manufactured by simultaneously press-molding a skin material having a cushion layer and a core material. To provide an interior part for an automobile that provides a good soft feel, does not cause unevenness on the surface of the product, maintains surface smoothness, and has an excellent exterior design.

(Means for Solving the Problems) In order to achieve the above object, the present invention cold-press molds a heat-softened resin core material into a desired shape, and at the same time, integrally attaches a skin material to the surface side of the core material. In the automotive interior parts formed by the above skin material, the skin material blocks the heat of the skin layer with surface decoration properties, the foam layer with cushioning properties, and the core material from being transmitted to the foam layer, and also prevents the heat from being transmitted to the foam layer during press molding. It is characterized in that it is composed of a laminated structure including at least three solid layers that faithfully transmit the pressing force to the core material side.

(Function) As is clear from the above structure, the skin material used in the present invention is composed of a solid layer laminated in addition to the skin layer and the foam layer, and this solid layer allows the heat of the core material to be transmitted to the foam layer. In addition to having the function of blocking the press pressure during press molding, it also has the function of directly transmitting the press pressure to the core H, which prevents cell destruction of the foam layer as much as possible, and also prevents unevenness from occurring on the surface of the core material. can be suppressed.

(Embodiments) Hereinafter, embodiments of the automobile interior parts according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a cross-sectional view showing an embodiment in which the present invention is applied to an automobile door trim, and FIGS. 2 and 3 are cross-sectional views showing the molding process of the automobile door trim.

In FIG. 1, an automobile door trim 10 is generally composed of a core material 11 formed into a desired curved shape and a skin material 12 integrally attached to the surface side of the core material 11 by press molding.

More specifically, the core material 11 is prepared by mixing and stirring polyolefin resin and wood flour at an appropriate mixing ratio, extruding the sheet into a sheet using a T-die extruder, and softening the sheet by heating. The desired curved shape is achieved by cold press molding.

It is shaped.

On the other hand, the skin material 12 has a four-layer structure in this example, from the surface side: skin layer 13°, foam layer 14.
There are four layers: a solid layer 152 and a foam layer 16. Furthermore, a base fabric 17 such as knitted fabric is laminated on the lower surface of the foam layer 16, that is, on the side facing the core material 11, in order to improve adhesion. More specifically, the skin layer 13 and the foam layer 14
is a sea-produced PVC sheet, the skin layer 13 has a dense cell structure, and has a good surface appearance and feel.
On the other hand, the foam layer 14 has larger cells and lower density as it goes deeper into the foam layer, and has a good cushioning function. Next, as the solid layer 15, a vinyl chloride sheet is used in this example, and as the foam layer 16, polyurethane foam is used.

The thickness of each of these layers is 0.3 to 0.4 m for the epidermal layer.
m, foam layer 14 is 0.5 to 1.5 mm, solid layer 15
is 0.15 to 0.25 mm, and the foam layer 16 is 0.5 to 1.
0 opening and the base fabric 17 is 0.2 mm, and the total thickness is 2-b.Next, based on FIGS. As shown in the figure, the mold surface 20 of the lower mold 20 for cold press molding
A sheet 11' of the core material 11, which has been heated and softened, is placed on the sheet a'. Then, the skin material 12 whose peripheral edge is held by the clamp device 21 is positioned and set from above. Incidentally, an upper die 22 for cold press forming a pair with a lower die 20 for cold press molding is located above the skin material 12, and this die 22 is configured to be movable downward by a lifting device (not shown). has been done.

When the setting of the materials is completed, the upper die 22 for cold press molding is lowered by the operation of the lifting device, and as shown in FIG.
Press molding is performed by 22. At this time, the core material 11
is heated to nearly 180°C to 200°C, but the solid layer 15 acts as a barrier and can reliably block the heat of the core material 11 from being transmitted to the foam layer 14 on the surface side. The foam layer 14 is not in a molten state, and the cells are restored after press molding, so that the cushioning properties are not impaired.

Furthermore, this solid layer 15 transmits the press pressure from the upper mold 22 for cold press molding to the core material 11 in a planar manner, so that unevenness does not occur on the surface of the core material 11.
As a result, the skin layer 13 of the skin material 12 serving as the product surface can maintain a smooth surface shape, improving the appearance and design.

Next, in Table 1, when comparing the hardness of the skin material according to the present invention and a conventional skin layer consisting of a two-layer structure of only the skin layer 13 and the foam layer 14, omitting the solid layer 15, the hardness of the skin material according to the present invention is compared. The hardness before molding is slightly higher than that of conventional products because of the solid layer 15, but
It can be easily seen that after molding, the hardness of the material of the present invention is lower than that of the conventional example, and it has better cushioning properties accordingly.

represent This is a comparison of actual measured values.

In this embodiment, the foam layer 16 laminated on the back side of the solid layer 15 has a force S that has the effect of absorbing the unevenness of the core material 11. This foam layer 16 is omitted and is used as a skin material. , a three-layer structure including a skin layer 131, a foam layer 14, and a solid layer 15 may be used. Further, although the base fabric 17 is used to enhance the adhesiveness with the core material 11, this base fabric 17 may be replaced with another adhesive medium.

(Effects) As described above, the automobile interior parts according to the present invention have the following special effects.

■According to the present invention, in addition to the skin layer 1 foam layer, a solid layer is installed as the skin material on the side facing the core material, so when the skin material and the core material are simultaneously press-molded, the core material This solid layer blocks out the heat and prevents cell destruction as much as possible, so the cells in the foam layer of the skin material recover after press molding, providing a good soft feel and excellent cushioning function. This has the effect of supplying interior parts.

■According to the present invention, since a solid layer is provided on the skin material on the side facing the core material, the press pressure during press molding is
It forms a plane with the core H through the solid layer, allowing for good drawing forming without creating any unevenness on the surface of the core material.
Unlike conventional products, the surface irregularities of the core material do not appear on the product surface and the surface appearance deteriorates, and there are effects such as an excellent surface appearance and improved appearance design.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing an embodiment in which the present invention is applied to an automobile door trim, FIGS. 2 and 3 are cross-sectional views explaining the molding process of the automobile door trim, and FIGS. 4 and 5 are FIG. 3 is an explanatory diagram showing a conventional molding process for interior parts. 10...Automotive door trim 11...Core material 12...Skin material 13...Skin layer 14...Foam layer 15...Solid layer 16...Foam layer 17...Base fabric 20 ...Lower mold for cold press molding 22...Upper mold for cold press molding Fig. 3

Claims (1)

[Claims] 1. Cold-press molding a heat-softened resin core material (11) into a desired shape, and at the same time integrally attaching a skin material (12) to the surface side of this core material (11). In the automobile interior parts, the skin material (12) is a skin layer (13) having surface decorative properties.
), a foam layer with cushioning properties (14), and a core material (11)
) A laminated structure comprising at least three solid layers (15) that block the heat from being transmitted to the foam layer (14) and faithfully transmit the pressing force during press molding to the core material (11) side. An automobile interior part characterized by comprising: