JPH0635250B2 - Interior parts for automobiles - Google Patents

Description

TECHNICAL FIELD The present invention relates to automobile interior parts such as automobile door trims and rear corner trims, and particularly, provides good surface feel and smoothness of the surface. The present invention relates to an interior part for an automobile.

《Prior Art》 Normally, the interior parts mounted on the inner surface side of the vehicle body panel of the automobile have a core material excellent in rigidity in consideration of shape retention and attachment to the body panel, and the surface side of this core material. It is generally a laminated structure having a skin material provided with decorative and cushioning properties.

Referring to FIGS. 4 and 5, a conventional example in which this type of interior component is formed by press molding will be described. First, the core material 1
In consideration of cost, moldability, strength, etc., polypropylene resin or a material in which polypropylene resin is mixed with wood powder filler is extruded into a sheet, and the sheet 1'is cold-press molded to be drawn. Then, the core material 1 is molded. Simultaneously with the molding of the core material 1, the skin material 2 is integrally attached to the surface side of the core material 1. As the skin material 2, a foamed vinyl chloride sheet is used as shown in FIG. ing. This foamed PVC sheet has a dense cell structure on the surface side, has an excellent surface feel and surface appearance, and has a structure in which the cells become larger and the density becomes smaller toward the inner back side, which is the so-called dense skin. It is composed of a layer 3 and a foam layer 4 having a cushioning property.

Then, after the heat-softened sheet 1'is placed on the die surface 5a of the cold press forming lower die 5, the skin material 2 is set from the upper side thereof, and the cold press upper die 6 is lowered, The core material 1 is drawn and formed into a desired shape by the clearance between the upper and lower dies 5 and 6 for cold press, and at the same time, the core material 1 and the skin material 2 are integrated.

<< Problems to be Solved by the Invention >> However, when the core material 1 and the skin material 2 are integrated by the conventional simultaneous pressing method as described above, the influence of heat from the core material 1 during press molding is affected. Upon receipt, the foam layer 4 becomes in a molten state, the cells in the foam layer 4 are broken by the compression action by the pressing pressure, the foam layer 4 does not restore after molding, and the thickness of the skin material 2 before molding is 2 to 2. It has been pointed out that the thickness of 3 mm is reduced to half after molding from 1 to 1.5 mm, the soft feeling is impaired, and the cushioning function is significantly reduced.

Further, since the foam layer 4 of the skin material 2 has a relatively large wall thickness, the press pressure during press molding is buffered, and the sheet 1'is
Cannot be faithfully drawn on the mold surface 5a of the press mold 5, and the core material 1 becomes uneven. It is also pointed out that these irregularities also appear on the surface of the product, the surface smoothness of the product is extremely poor, and the appearance design is deteriorated.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an automobile interior part manufactured by simultaneously press-molding a skin material having a cushion layer and a core material, An object of the present invention is to provide an automobile interior part which has a good softness, maintains the surface smoothness without generating irregularities on the product surface, and has an excellent appearance design.

<< Means for Solving the Problem >> In order to achieve the above object, the present invention cold press-molds a resin core material softened by heating into a required shape, and at the same time, integrally attaches a skin material to the surface side of the core material. In the interior parts for automobiles to be worn, the skin material is a skin layer having a surface decorative property, a foaming layer having a cushioning property, and blocking the heat of the core material from being transmitted to the foaming layer, and at the time of press molding. It is characterized in that it is composed of a laminated structure having at least three layers of solid layers that faithfully transmit the pressing force to the core material side.

<< Operation >> As is apparent from the above configuration, the skin material used in the present invention is formed by laminating a solid layer in addition to the skin layer and the foam layer, and the heat of the core material is transferred to the foam layer in this solid layer. In addition to the function of blocking the pressure, it also has the function of directly transmitting the press pressure at the time of press molding to the core material, which can prevent the cell destruction of the foam layer as much as possible, and the surface of the core material becomes uneven. Can be suppressed.

<Example> Hereinafter, an example of the interior part for vehicles concerning the present invention is described in detail, referring to an accompanying drawing.

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

In FIG. 1, an automobile door trim 10 is roughly composed of a core material 11 formed into a desired curved surface 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 a polyolefin resin and wood powder at an appropriate mixing ratio, extruding the mixture into a sheet by a T-die extrusion molding machine, heating and softening the sheet, and then, as described later. It is molded into a desired curved shape by cold press molding.

On the other hand, the skin material 12 has a four-layer structure in this example, and the skin layer 13, the foam layer 14, and the
The four layers are the solid layer 16 and the foam layer 16. Further, a base cloth 17 such as a knitted fabric is laminated on the lower surface of the foam layer 16, that is, the surface facing the core material 11 in order to improve the adhesiveness. More specifically, the skin layer 13 and the foam layer 14 described above.
Is a foamed PVC sheet, the skin layer 13 has a dense cell structure, and has a good surface appearance and surface feel,
On the other hand, the foam layer 14 has a larger cell and a smaller density as it goes inward, and has a good cushioning function. Next, a vinyl chloride sheet is used as the solid layer 15 in this example, and a polyurethane foam is used as the foam layer 16.

The thickness of each of these layers is 0.3-0.4 m for the skin layer.
m, the foam layer 14 is 0.5 to 1.5 mm, the solid layer 15 is 0.15 to 0.25 mm, and the foam layer 16 is 0.5 to 1.0 m
m, and the base cloth 17 is 0.2 mm, and the total thickness is 2 to
It is set to 3 mm.

Next, the molding process of the automobile door trim 10 will be described with reference to FIGS. 2 and 3. First, as shown in FIG. 2, the mold surface 20 a of the cold press molding lower mold 20.
The sheet 1 in the heat-softened state which is the material of the core material 11
Place 1 '. Then, the skin material 12 whose peripheral edge is held by the clamp device 21 is positioned and set from the upper side thereof. An upper die 22 for cold press which is paired with a lower die 20 for cold press molding is located above the skin material 12, and the upper die 22 is configured to be vertically movable by an elevating device (not shown). .

When the material setting is completed, the cold press molding upper die 22 is lowered by the operation of the elevating device, and as shown in FIG.
Press molding is performed according to 2. At this time, the core material 11 is heated to around 180 ° C. to 200 ° C., but the solid layer 15 acts as a barrier and surely blocks the heat of the core material 11 from being transmitted to the foam layer 14 on the surface side. Therefore, the foam layer 14 on the surface side is not in a molten state, the cells are restored after the press molding, and the cushioning property is not impaired.

Further, since the solid layer 15 transmits the pressing pressure from the cold press molding upper die 22 to the core material 11 in a planar manner, the surface of the core material 11 does not have irregularities,
As a result, the skin layer 13 of the skin material 12, which is the product surface, can maintain a smooth surface shape, and the appearance design is improved.

Next, in Table 1, comparing the hardness of the skin material according to the present invention with the hardness of the conventional skin material having a two-layer structure having only the skin layer 13 and the foam layer 14 without the solid layer 15, The hardness before molding is slightly higher than that of the conventional one because of the presence of the solid layer 15. However, after molding, the hardness of the present invention is lower than that of the conventional example. It can be easily understood that it has a good cushioning property.

The hardness comparison in Table 1 is a comparison of actual measurement values by the Shore A hardness test.

In addition, in this embodiment, the foam layer 16 laminated on the back surface side of the solid layer 15 has an effect of absorbing irregularities of the core material 11. However, the foam layer 16 is omitted, and as a skin material, A three-layer structure including the skin layer 13, the foam layer 14, and the solid layer 15 may be used. Further, the base cloth 17 is the core material 1.
The base cloth 17 may be replaced with another adhesive medium, although it is used to enhance the adhesiveness with 1.

<< Effects >> As described above, according to the automobile interior part of the present invention, the following special operational effects are obtained.

According to the present invention, as the skin material, in addition to the skin layer and the foamed layer, the solid layer is installed on the side facing the core material. Therefore, when the skin material and the core material are simultaneously pressed, This solid layer cuts off the heat that is being generated and prevents cell destruction as much as possible, so the cells in the foam layer of the skin material are restored after press molding, and a good soft feeling is obtained, with an excellent cushioning function. The effect is to supply interior parts.

According to the present invention, since the solid layer is provided on the skin material on the side facing the core material, the pressing pressure during press molding is
Since it is applied to the core material in a planar manner through the solid layer and can be satisfactorily drawn without causing irregularities on the core material surface,
The surface irregularities of the core material do not appear on the surface of the product as in the conventional case, and the surface appearance is not deteriorated, and there is an effect that the appearance design is improved such that an excellent surface appearance is obtained.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment in which the present invention is applied to an automobile door trim, FIGS. 2 and 3 are sectional views for explaining a molding process of the automobile door trim, and FIGS. 4 and 5 are It is each explanatory view which shows the forming process of the conventional interior component. 10 ... Automotive door trim 11 ... Core material 12 ... Skin material 13 ... Skin layer 14 ... Foam layer 15 ... Solid layer 16 ... Foam layer 17 ... Base cloth 20 ... Cold press molding lower mold 22 ... Upper die for cold press molding

Claims (1)

[Claims] 1. A heat-softened resin core material (11) is cold-press molded into a required shape, and at the same time, the core material (1)
In an interior part for an automobile, wherein a skin material (12) is integrally attached to the surface side of (1), the skin material (12) is a skin layer (1) having a surface decorative property.
3), a foam layer (14) having a cushioning property, and a core material (1
A laminated structure including at least three layers of a solid layer (15) that blocks the heat of 1) from being transferred to the foam layer (14) and faithfully transfers the pressing force at the time of press molding to the core material (11) side. Interior parts for automobiles characterized by being composed of the body.