Plastic and nonmetallic article shaping or treating: processes – Optical article shaping or treating – Light polarizing article or holographic article
Patent
1996-10-31
2000-05-09
Vargot, Mathieu D.
Plastic and nonmetallic article shaping or treating: processes
Optical article shaping or treating
Light polarizing article or holographic article
264 16, 264 19, B29D 1100
Patent
active
060600039
ABSTRACT:
A method and apparatus for producing a lenticular plastic sheet from a plastic sheet having a first surface and an opposite second surface employs a first chill roller having an outer surface, a patterned chill roller having an outer surface defining a first lenticular pattern thereon, disposed adjacent and parallel to the first chill roller so as to define a first nip therebetween and a second chill roller, having an outer surface and being spaced apart from the first chill roller and disposed adjacent and parallel to the patterned chill roller so as to form a second nip therebetween. A plastic sheet is extruded into the first nip so that the plastic sheet is molten as it passes into the first nip and so that the first surface of the plastic sheet is in contact with the first lenticular pattern, thereby facilitating the formation of a second lenticular pattern on the first surface. The second lenticular pattern is complimentary in shape to the first lenticular pattern. A belt is disposed about the first chill roller and the second chill roller that applies force to the second surface of plastic sheet in the direction of the patterned chill roller, thereby maintaining the first surface in contact with the first lenticular pattern on the patterned chill roller to inhibit distortion of the second lenticular pattern on the first surface of the plastic sheet as the plastic sheet cools from being in a molten state to a non-molten state.
REFERENCES:
patent: 3146492 (1964-09-01), Lemelson
patent: 3839514 (1974-10-01), Nauta
patent: 4601861 (1986-07-01), Pricone et al.
patent: 5656209 (1997-08-01), Benz et al.
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