Process for manufacturing plastic microspheres

Plastic and nonmetallic article shaping or treating: processes – Formation of solid particulate material directly from molten... – By extrusion spraying or gravity fall through orifice

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264 14, 264141, B29B 910, B29B 912

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055252745

ABSTRACT:
Spherical particles having a diameter between 0.007" and 0.040" are formed from melt extruded thermoplastic material suitable for casting on a heated mold surface and melting thereon to form a thin layer of material having a nominal thickness of 0.040" that is cooled and removed from the mold surface as a part having a porosity less than a visually observable threshold. The process includes the steps of providing microspheres formed of blended and melt extruded thermoplastic, plasticizers (if necessary) and pigment additives that constitute less than 5% by weight of the blend and shaped as a smooth round spherical particle. The microspheres may then be distributed as predetermined charge of such microspheres against the heated casting surface to melt the microspheres as a layer of thermoplastic material having a porosity less than 0.003 inches and thereafter cooling and removing the non-porous layer from the casting surface.

REFERENCES:
patent: 2862243 (1958-12-01), Farr et al.
patent: 2918701 (1959-12-01), Hull et al.
patent: 3042970 (1962-07-01), Terenzi
patent: 3060510 (1962-10-01), Fischer et al.
patent: 3207818 (1965-09-01), Marshall
patent: 5124090 (1992-06-01), Shimizu et al.
patent: 5244984 (1993-09-01), Suzuki

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