Method of producing a reflector for a headlight, particularly fo

Details Method of producing a reflector for a headlight, particularly fo Method of producing a reflector for a headlight, particularly fo

1986-03-21

1987-06-02

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Composite or multiple layer

264 451, 264129, 264255, 264327, 2643288, 26432812, 425130, 425146, 425812, B29D 1100

Patent

active

046701990

ABSTRACT:
Method of production of a reflector wall having a core of thermosetting material enclosed in a skin of thermoplastic material, by two-material injection molding. Between a concave mold face having projecting points and a convex mold face, a thermoplastic skin material and a thermosetting core material having a polycondensation temperature greater than the plasto-elasticity temperature of the thermoplastic skin material are successively injected, while holding a temperature intermediate between the two temperatures; the points cause in the skin material interruptions permitting the emergence of the core material to the concave mold face, in localised zones of this in which open vents; the polycondensation of the core material and the hardening of the skin material is successively caused.

REFERENCES:
patent: 3917789 (1975-11-01), Heisler
patent: 4014966 (1977-03-01), Hanning
patent: 4017225 (1977-04-01), Hanning
patent: 4035466 (1977-07-01), Langecker
patent: 4201742 (1980-05-01), Hendry
patent: 4335068 (1982-06-01), Hemery
patent: 4419321 (1983-12-01), Hardigg
patent: 4459257 (1984-07-01), Baciu
patent: 4474717 (1984-10-01), Hendry
patent: 4507254 (1985-03-01), Daniels et al.
patent: 4560342 (1985-12-01), Ishida et al.

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