Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Producing multilayer work or article
Reexamination Certificate
1994-04-25
2001-08-28
Ortiz, Angela (Department: 1732)
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Producing multilayer work or article
C264S266000, C264S275000
Reexamination Certificate
active
06280678
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a process for producing a multilayer molded article which comprises a thermoplastic resin body and a skin material which is laminated on a part of the thermoplastic resin body.
2. Description of the Related Art
A large number of plastic molded articles are used in many fields including the automobile and domestic electric appliance fields because of their low cost, free moldability and light weight. However, they have some drawbacks that they have poor appearance and cool feeling and they tend to be easily flawed. Then, it is highly desired to impart decoration and soft feeling to the plastic molded articles. Hitherto, to impart decoration to the plastic molded article, there have been many methods for producing a partly laminated multilayer molded article comprising a thermoplastic resin body and a skin material which is laminated on a part of the thermoplastic resin.
When the partly laminated multilayer molded article is produced by supplying a rein melt between the skin material and a mold and closing the mold to press mold the article, it is important to precisely place the skin material on a desired part of the thermoplastic resin body and finish edges of the skin material with good appearance. To these ends, various molding methods have been proposed in which a measure for fixing the skin material is devised.
For example, Japanese Patent Kokai Publication No. 150741/1984 discloses a method for producing a partly laminated multilayer molded article wherein edges of the skin material are clamped with a skin material-fixing plate and a lower mold. However, by this method, it is impossible to laminate the skin material on a center part of the molded article.
Japanese Patent Kokai Publication No. 175111/1990 discloses a molding method wherein a skin material is clamped with a special jig and placed in the mold. However, this method cannot be used when the skin material has a complicated shape.
A further method is disclosed in Japanese Patent Kokai Publication No. 26414/1989, wherein a partition wall is provided on the mold surface and the skin material is placed on the mold surface with matching a parting part of the skin material with this partition wall to prevent dislocation of the skin material.
It may be possible to design a part of the mold in a telescopic form and fix the position of the skin material by sucking the skin material through a gap between the upper and lower molds. But, the edges of the skin material are simple and the molded article its loses high quality appearance.
SUMMARY OF THE INVENTION
One object of the present invention is to provide a method for producing a partly laminated multilayer molded article with no dislocation of a skin material by a simple method.
Another object of the present invention is to provide a method for producing a partly laminated beautiful multilayer molded article having high quality appearance at edges of the skin material.
According to the present invention, there is provided a method for producing a multilayer molded article which comprises the steps of supplying a skin material and a melt of a thermoplastic resin between unclosed upper and lower molds and simultaneously molding the thermoplastic resin to form a molded article and laminating the skin material on a part of a surface of the molded article by pressing and cooling the thermoplastic resin in the molds, wherein the lower mold has a protruding part at a position where an edge of the skin material is located, the upper mold has a depressed part at a position corresponding to the protruding part of the lower mold, and, during molding, the edge of the skin material is fixed to the lower mold by sucking it through a gap which opens at the protruding part or a root of the protruding part.
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Fujita Hiromu
Hara Takahisa
Kamiji Yuji
Matsumoto Masahito
Nakatsuka Hiromasa
Birch & Stewart Kolasch & Birch, LLP
Ortiz Angela
Sumitomo Chemical Company Limited
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