Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – To produce composite – plural part or multilayered article
Patent
1994-11-04
1996-06-11
Heitbrink, Jill L.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
To produce composite, plural part or multilayered article
264255, B29C 4516
Patent
active
055252834
ABSTRACT:
A method for the production of laminated moldings, such as internal linings or panellings of motor vehicles and the like, and dimensionally stable parts in which a support part is provided with a surface lamination and in which initially a preform having the same volume as the support part, but not having the same surface area with respect to the final shaping, is produced. Utilizing the inherent production heat, the preform is then connected by pressure action to the lamination by back-embossing with the thermoplastic material of the support part and is given its final shape by material flow processes. The invention improves back-embossing in the production of laminated moldings in such a way that with reduced embossing forces the surface-unitary adhesion of the lamination to the support part is improved and the risk of bubble formation is eliminated. This is achieved in that preforms identical in volume to that of the support part and having the same contour shapes as the finished laminated molding and with a lattice-like structure at least in partial areas are subject to the material flow process so that the initially open lattice meshes of the preform are closed by local flow with the pressure application for the back-embossing process.
REFERENCES:
patent: 1593525 (1926-07-01), Copeland
patent: 5122320 (1992-06-01), Masui et al.
patent: 5401449 (1995-03-01), Hill et al.
patent: 5401457 (1995-03-01), Valyi
Heitbrink Jill L.
Lignotock GmbH
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