Production of transparent globules

Details Production of transparent globules Production of transparent globules

1982-09-29

1984-09-04

Lowe, James B.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Continuous or indefinite length

156279, 264 19, 264 27, 264 15, 264131, 264140, 264162, 264284, 350105, 427137, 427180, 427204, 427275, B29D 1100, B29C 1700

Patent

active

044696450

ABSTRACT:
A new method for producing retro-reflecting assemblies of the type comprising a transparent globule having an essentially part-spherical upper portion uncoated for light impingement, and a lower portion associated to a monolayer of focusing and reflective microspheres, the method comprising forming said globule by subjecting a sheet thermoplastic material to heat and pressure in the bite of counter-rotating forming rollers to provide an essentially planar intermediate product having oppositely located bulges at either faces thereof, the globules being obtained by subdividing said product in parts each comprising a pair of opposite bulges. The invention comprises improved assemblies comprising each an asymmetrical globule having the monolayer of microspheres associated to its essentially bottom face and to its peripheral toroidal side face of a radius of curvature smaller than that of its upper bulging portion exposed for light impingement.

REFERENCES:
patent: Re22358 (1943-08-01), Aspin
patent: 3781083 (1973-12-01), Eigenmann
patent: 3859407 (1975-01-01), Blanding et al.
patent: 3963309 (1976-06-01), Schwab

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