Plastic and nonmetallic article shaping or treating: processes – Forming articles by uniting randomly associated particles – With subsequent cutting – grooving – breaking – or comminuting
Patent
1993-09-17
1996-03-26
Theisen, Mary Lynn
Plastic and nonmetallic article shaping or treating: processes
Forming articles by uniting randomly associated particles
With subsequent cutting, grooving, breaking, or comminuting
264140, 264141, 264 42, B29B 902
Patent
active
055018262
ABSTRACT:
A method is provided for producing dense, free-flowing and non-caking alkali metal silicate-based particles which are heat expandable into lightweight particles of a spumiform character. Pursuant to the invention, one provides at a selected temperature a dilatant aqueous gel comprising an alkali metal silicate as the majority non-aqueous component, the silicate being present in the gel in a dissolved state; and the non-aqueous content of the gel being in the range of from about 38 to 65% (w/w). Shearing forces are imposed upon the gel which exceed the flow response characteristics of the gel, whereby the viscosity of the gel becomes sufficiently high to cause a discontinuity in the gel, resulting in disruption into discrete particles. The discrete particles are conditioned while being maintained as separate entities to thereby form a skin on the particles so that they will not agglomerate or coalesce with one another. The conditioned particles are dried to form particles having about a 5 to 40% (w/w) moisture level.
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patent: 3728208 (1973-04-01), Whittington et al.
patent: 3756839 (1973-09-01), Rao
patent: 3765919 (1973-10-01), Gelbman
patent: 3951834 (1976-04-01), Gillilan
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Ertle Raymond J.
Ertle Raymond T.
Cylatec Corp.
Theisen Mary Lynn
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