Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Including hydrostatic or liquid pressure
Patent
1998-07-29
2000-02-29
Derrington, James
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Including hydrostatic or liquid pressure
264120, 264109, 264667, 264680, 4254051, 4254052, B29C 4310
Patent
active
060305762
ABSTRACT:
A method for forming ceramic tiles by means of a partially isostatic mold, comprising the following stages: loading the ceramic powder to be pressed into the mold cavity; exerting a uniform pressure on the entire surface of the ceramic powder present in the mold cavity; releasing the pressure and partially opening the mold to facilitate powder deaeration; exerting pressure on a first portion of the surface of the powder contained in the mold cavity; exerting pressure on a second portion of the surface of the powder contained in the mold cavity, while simultaneously nullifying the pressure on said first surface portion of the powder contained in the mold cavity; and alternating the exertion of pressure on said first and on said second portion alternately.
REFERENCES:
patent: 2618833 (1952-11-01), Adams
patent: 3671618 (1972-06-01), Huber
patent: 3717693 (1973-02-01), Kohl et al.
patent: 5330346 (1994-07-01), Scardovi
patent: 5599566 (1997-02-01), Casolari
patent: 5786003 (1998-07-01), Debbia
Derrington James
SACMI-Cooperativa Meccanici Imola-Soc. Coop. A.R.L.
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