JPS6210196Y2 - - Google Patents

Description

[Detailed explanation of the idea]

The present invention relates to interior materials for automobiles. In recent years, synthetic resin laminated interior materials with a sealed air space have come to be used as interior materials for automobiles.The laminated interior materials are preformed in advance into a shape that matches the inner surface of the car body to which they are to be installed. The interior can be attached by connecting the peripheral edge of the interior material to the vehicle body structural material using a connecting piece such as a clip. Although such laminated interior materials have many advantages such as being lightweight, having a good cushioning function, and having an excellent appearance as well as being extremely easy to install, they have poor resistance at low temperatures. It has problems in thermal stability such as impact resistance and deformation at high temperatures, and also has a drawback of poor shape stability during preforming. That is, for example, when a laminated interior material is used as a ceiling interior material, when a lump of snow falls onto the roof of a car in low-temperature conditions such as during winter, the synthetic resin panel that forms a sealed air layer will be damaged by the impact. In addition, as mentioned above, the ceiling interior material is only fixed to the vehicle body parts with clips, etc., so the ceiling interior material may be exposed to temperatures of 80 degrees Celsius in high-temperature conditions such as summer. If the ceiling is heated to high temperatures that reach even higher temperatures, problems such as the interior material in the center of the ceiling sagging downwards will occur. Furthermore, there are other problems such as the large spring back during preforming and the difficulty in maintaining a delicately curved surface that matches the ceiling surface. The present invention provides a laminated interior material that can satisfy all of these demands, such as improved impact resistance at low temperatures, reduced deformation at high temperatures, and improved shape stability after molding. Explain with reference to an example. In the figure, 1 is a first liner made of a flat plate, 2 is a core formed by embossing a flat plate by vacuum processing, and 3 is a second liner made of a flat plate. The first liner 1 and the second liner 2 are stacked and heat-sealed to form a base material 5 having many sealed air spaces 4. A cushion layer 6 such as a polypropylene foam sheet or a polyurethane foam sheet is heat-sealed or adhered to the lower surface of the second liner 3, and a vinyl chloride sheet, synthetic leather, nonwoven fabric, cloth, etc. is attached to the lower surface of the cushion layer 6. The skin layer 7 is attached using adhesive or the like, for example. Then, the thus integrally laminated product is molded by vacuum heat forming into a curved shape that matches the mounting surface, for example, the ceiling surface of a vehicle body. In the interior material having the above structure, the present invention uses polypropylene copolymer as the first liner 1 constituting the base material 5, and uses polypropylene homopolymer containing talc as the core 2 and the second liner 3. This is a characteristic feature. In other words, as shown in Table 1, polypropylene copolymer has far superior impact strength compared to other materials, and when this polypropylene copolymer is attached to the interior material, it is in contact with (or in close proximity to) the vehicle body surface. Talc-filled polypropylene is used as the material for the first liner 1 to prevent damage to interior materials due to impact loads applied to the vehicle body surface, and has low impact strength but excellent heat resistance and bending rigidity. By forming the core 2 and the second liner 3 with a homopolymer, it was possible to prevent deformation such as sagging at high temperatures and improve the shape stability after molding. The first liner 1 is made of polypropylene copolymer.
The core 2 is made of a 0.3 mm thick plate made of polypropylene homopolymer (with talc) by embossing, and the second liner 3 is made of a 0.25 mm thick plate made of the same material as the core 2. formed with
These first liner 1, core 2, and second liner 3 are heat-sealed to form a base material 5 with a thickness of about 3 mm to 7 mm, and this second liner 3 is made of a polypropylene foam sheet with a thickness of 2 mm to 3 mm. As a result of various experiments on a laminated interior material made by laminating a cushion layer 6 and a skin layer 7 made of a vinyl chloride sheet approximately 0.5 mm thick as one body, we found that it was left at a low temperature of approximately -30°C for one hour. A test piece with a size of 200 mm x 200 mm (the above laminated interior material) was supported at both ends,
In an impact test in which a 0.45Kg steel ball was dropped from a height of approximately 50cm, no cracks were observed, and as a ceiling interior material, the center part sagged within 4mm under high temperature conditions (approximately 80℃). Furthermore, it was confirmed that the shape stability after preforming as a ceiling interior material was also extremely good. As described above, according to the present invention, the materials of the first liner, core, and second liner constituting the base material having a sealed air layer are that the first liner is a polypropylene copolymer, and the core and second liner are polypropylene homopolymers. By using talc-containing materials, the excellent functions unique to both materials are combined, and the conventional disadvantages of this type of interior material are impact resistance at low temperatures, deformation at high temperatures, and shape stability after molding. It is an ideal material that can solve all problems such as durability, and also has the advantages of the laminated interior material itself, such as being lightweight, having a good appearance, and being extremely easy to install. This makes it possible to obtain an interior material that has many practical effects.

【table】

【table】 [Brief explanation of the drawing]

The accompanying drawing is a longitudinal sectional view of an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...First liner, 2...Inner core, 3...Second liner, 4...Sealed air layer, 5...Base material, 6...Cushion layer, 7...Skin layer.

Claims (1)

[Scope of utility model registration request] The first plate is embossed on both sides of the core.
configuring a base material in which a liner and a second liner are stacked to form a sealed air layer, a cushion layer is stacked on the second liner of the base material, a skin layer is stacked on the cushion layer,
A laminated interior material for an automobile in which these are integrated, wherein the first liner is made of a polypropylene copolymer, and the core and second liners are each made of a polypropylene homopolymer containing talc.