Mold and a method of hot-forming a thermoplastic lens

Details Mold and a method of hot-forming a thermoplastic lens Mold and a method of hot-forming a thermoplastic lens

2005-04-26

2005-04-26

Lorengo, J. A. (Department: 1734)

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

C264S002400, C264S002700, C264S296000, C264S327000, C425S407000, C425S808000, C425SDIG001, C425SDIG002

Reexamination Certificate

active

06884369

ABSTRACT:
The mold comprises two dies mounted in a sheath to slide along the axis of the sheath and each presenting a forming face facing the other. The two dies and the sheath are provided with intrinsic heat transfer means.A parison or preform of said thermoplastic material is placed between the two dies and the assembly is enclosed in the sheath; the dies and the sheath are heated by their intrinsic heat transfer means up to a forming temperature;The dies are moved towards each other to shape the material by plastic deformation until a predetermined relative position is reached corresponding to the thickness desired for the lens; the dies and the sheath are cooled by their intrinsic heat transfer means down to an unmolding temperature; and the finished lens is extracted from the mold.

REFERENCES:
patent: 2304664 (1942-12-01), Smith
patent: 4364878 (1982-12-01), Laliberte et al.
patent: 4540534 (1985-09-01), Grendol
patent: 4569807 (1986-02-01), Boudet
patent: 4933119 (1990-06-01), Weymouth, Jr.
patent: 5075051 (1991-12-01), Ito et al.
patent: 5297951 (1994-03-01), Asai
patent: 5376317 (1994-12-01), Maus et al.
patent: 5458820 (1995-10-01), Lefebvre
patent: 6180033 (2001-01-01), Greshes
patent: 2 525 525 (1983-10-01), None
patent: 572748 (1945-10-01), None
patent: 62095210 (1987-05-01), None
patent: 9924243 (1999-05-01), None
patent: 0143953 (2003-06-01), None

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