JPS6140163B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an automobile interior decoration method.

The conventional interior decoration method is to coat a preheated mold with plastisol, while a preheated substrate is coated with plastisol mixed with a blowing agent, the substrate is loaded into the mold, and a corresponding mold is placed on top of it. A method is used in which the skin layer and the base material are bonded and integrated through the foam layer by gelling and foaming by heating the foam layer, and such an interior material is attached to the inner panel of the vehicle body.

This method requires a mold, a step of removing the molded interior material from the mold, and a step of attaching the interior material to the inner panel.

The present invention improves the above-mentioned drawbacks of the prior art, and eliminates the need for one side of the mold, and therefore the process of removing the molded interior material from one side of the mold and the process of attaching the interior material to the inner panel are unnecessary. The purpose of this method is to provide an automobile interior decoration method that achieves this, and the main point is to use the inner panel itself instead of one of the molds.

The present invention will be explained with reference to an embodiment shown in the drawings.

The inner panel 1 of the door is shown in FIG. The inner panel 1 has a recessed part 1 for mounting a window opening/closing handle.
A, 1B, armrest 1C, wheel bulge 1D, etc. are formed. The inner panel 1 is preheated, and plastisol 2 is uniformly applied to a predetermined surface by, for example, a spray 3, as shown in FIG. The coating thickness is usually about 1.0 to 1.5 mm.

Plastisol 2 is a paste resin made by kneading a thermoplastic synthetic resin such as polyvinyl chloride (PVC), polystyrene, polymethacrylate, acrylonitrile-butadiene-styrene copolymer, thermoplastic polyurethane, etc. with a plasticizer, and further suspending it in a plasticizer. Examples of formulations are as follows.

PVC paste 100 parts by weight Plasticizer (dioctyl phthalate) 70 Stabilizer 2-3 Pigment 1 In the above formulation example, the preheating temperature of inner panel 1 is
The temperature will be around 200℃.

As the plastisol 2 comes into contact with the preheated inner panel 1, the contact surface with the inner panel 1 becomes gelled, and the plastisol 2 comes into close contact with the inner panel 1.

Plastisol 2' mixed with a foaming agent is further uniformly applied to the surface to which plastisol 2 is applied, for example, by spraying 3', as shown in FIG. The coating thickness is usually about 2 mm. In this case, the plastisol 2' to which the blowing agent is added is the same as that used in 1, and the formulation example is as follows.

PVC paste 100 parts by weight Plasticizer (dioctyl phthalate) 80 Foaming agent (azodicarbonamide) 3~5 Stabilizer 2~3 After applying the plastisol 2' mixed with the foaming agent, form a predetermined shape corresponding to the inner panel 1. Set the upper mold 4 as shown in FIG. At this time, there is a slight gap 5 between the plastisol 2' surface and the upper mold 4 surface.
will be established. After setting the upper mold 4, it is heated to completely gel the plastisol 2 layer and gel and foam the plastisol 2' layer. When the plastisols 2 and 2' have the above-mentioned composition, the heating conditions are approximately 200 DEG C. for 5 to 10 minutes. In this way, the inner pulse 1 and the foam layer 13 are bonded together via the non-foamed skin layer 12, as shown in FIG. If the soft foam layer 13 is formed directly on the hard inner panel 1, the adhesive strength between the inner panel 1 and the foam layer 13 will be small and insufficient due to the significant difference in their materials and physical properties. That is, if the materials are different, the affinity between the objects to be adhered is small, and in this case, since one of the layers is a foam layer, the bonding area between the objects to be adhered is also small. Furthermore, if the physical properties, i.e. hardness, of the objects to be adhered are significantly different, when a peeling force is applied, stress will concentrate near the bonding surface of the softer object and material failure will likely occur, resulting in a decrease in the apparent adhesive strength. It becomes smaller.
Therefore, in the present invention, the adhesive strength between the inner panel 1 and the foam layer 13 is improved by interposing the non-foam skin layer 12 having a hardness intermediate between that of the inner panel 1 and the foam layer 13. That is, since the non-foamed skin layer 12 is not a foamed layer, the contact area with the inner panel 1 is large, and the contact area between the non-foamed skin layer 12 and the foamed layer 13 is small, but they are made of the same or similar plastic material. Therefore, they have a high affinity for each other, and even if a peeling force is applied to the structure, it will be dispersed by the non-foamed skin layer 12 and no stress concentration will occur near the adhesive surface of the foamed layer 13, resulting in material failure in that area. is prevented.

The configuration shown in FIG. 5 can also be obtained by the following method. That is, after the plastisol 2 is uniformly applied to the preheated inner panel 1, the following process is performed in place of the above process.

The plastisol 2 is heated to gel and form the skin layer 12. Heating conditions are approximately 200°C for 5 to 10 minutes.

Foam layer 13 formed in advance with adhesive or the like
Paste.

After the structure shown in FIG. 5 is obtained by the method described above, the following steps are further performed.

A facing material 6 is attached onto the foam layer 13 using an adhesive or the like. In this way, the interior material shown in FIG. 6 is obtained. The facing material 6 is leather, textile knitted fabric, or the like.

Instead of adhering the covering material 6 onto the foam layer 13 with an adhesive or the like, the surface of the foam layer 13 may be heated to directly form a pattern, a texture, or the like. Thus, as shown in FIG. 7, the surface of the foam layer 13 is melted to form a facing layer 16 having patterns, grains, etc. formed thereon.

As described above, the present invention forms the foam layer and the surface layer directly on the inner panel through the skin layer, so no mold is required, and therefore the mold release process of the molded interior material and the The process of attaching interior materials to the inner panel is also omitted, and the interior design of automobile bodies can be dramatically streamlined both economically and in terms of time. Furthermore, the adhesive strength between the foam layer and the inner panel is also extremely good due to the presence of the non-foam skin layer.

[Brief explanation of the drawing]

The figure shows one embodiment of the present invention.
The figure is a side sectional view of the inner panel, Figure 2 is a side sectional view of the inner panel coated with plastisol, and Figure 3 is the side of the inner panel shown in Figure 2 with plastisol containing a foaming agent further coated. cross section,
Figure 4 is a side sectional view of the upper mold set on the inner panel shown in Figure 3, and Figure 5 is a side sectional view of the foamed layer of the inner panel bonded together via the skin layer by heating. , FIG. 6 is a side sectional view of the interior material, and FIG. 7 is a side sectional view of the interior material in which the facing material is directly patterned, embossed, etc. In the figure, 1... Inner panel, 2... Plastisol, 2'... Plastisol mixed with a foaming agent, 4
... Upper mold, 6 ... Covering material, 13 ... Foam layer.

Claims (1)

[Claims] 1. Preheating a predetermined inner panel of an automobile body,
Step of applying plastisol 1. Step of applying plastisol mixed with a foaming agent on top of it 2. Step of setting an upper mold of a prescribed shape corresponding to the inner panel on top of it and heating it to gel and foam 3. Foaming Step 4 of attaching a covering material to the surface of the layer or patterning, embossing, etc. on the surface of the foam layer. An automobile interior decoration method consisting of the above steps 1, 2, 3, and 4. 2 Preheat the specified inner panel of the automobile body,
Step of applying plastisol 1. Step of heating and gelling the above plastisol 2' Step of pasting a foam layer on top of it 3' Attaching a covering material to the surface of the foam layer or adding a pattern or texture to the surface of the foam layer 4. An automobile interior decoration method consisting of the above steps 1, 2', 3', and 4.