Plastic and nonmetallic article shaping or treating: processes – Forming articles by uniting randomly associated particles – Plural – intermittent pressure applying
Patent
1998-07-29
2000-02-22
Derrington, James
Plastic and nonmetallic article shaping or treating: processes
Forming articles by uniting randomly associated particles
Plural, intermittent pressure applying
264109, 264680, 425412, 425419, 425356, B28B 300
Patent
active
060276754
ABSTRACT:
A method for forming ceramic tiles, including those of large dimensions, comprising the following stages: loading the powder to be pressed into the mould cavity; exerting an initial pressure on the entire surface of the powder present in the mould cavity; releasing the initial pressure; exerting the compacting pressure on the entire surface of the powder contained in the mould cavity; increasing the pressure on a first portion of the surface of the powder contained in the mould cavity up to a value permitted by the press capacity; releasing the pressure on said first portion of the surface of the powder contained in the mould cavity and increasing the compacting pressure on a second portion of the surface of the powder contained in the mould cavity; alternating the exertion of pressure on said first portion and on said second portion; and interrupting the exertion of pressure.
REFERENCES:
patent: 1012835 (1911-12-01), Frerichs
patent: 2618883 (1952-11-01), Adams
patent: 2888715 (1959-06-01), Frank
patent: 3671618 (1972-06-01), Huber
patent: 3717693 (1973-02-01), Kohl et al.
patent: 5037287 (1991-08-01), Hirai
patent: 5874114 (1999-02-01), Schrofele
Derrington James
SACMI-Cooperativa Meccanici Imola-Soc. Coop. A.R.L.
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