Method of and apparatus for producing molded articles from poura

Details Method of and apparatus for producing molded articles from poura Method of and apparatus for producing molded articles from poura

1982-07-12

1984-11-13

Hoag, Willard E.

Plastic and nonmetallic article shaping or treating: processes

Vacuum treatment of work

To degas or prevent gas entrapment

264256, 264314, 2643281, 425546, 425566, 425389, 425405H, 425DIG44, 425DIG60, B28B 302, B28B 1302

Patent

active

044825153

ABSTRACT:
In the production of molded articles from a pourable compound, such as an oxide ceramic compound, for example, a porcelain compound, an injection chamber is formed between an isostatic compression molding tool and a superposed injection head, negative pressure conditions are established within the injection chamber. The pourable compound is fluidized and is drawn into the injection chamber by the negative pressure. Subsequently, the compound is isostatically compressed while the negative pressure conditions are maintained during at least the initial phase of the compressing operation. A closing member is positioned at the opening into the injection chamber through which the pourable compound flows. The closing member is displaceable between an open position admitting flow and a closed position blocking flow into the injection chamber. In the closed position, the surface of the closing member facing into the injection chamber forms a continuation of the adjacent surface of the injection chamber.

REFERENCES:
patent: Re20460 (1937-08-01), Jeffery
patent: 2270075 (1942-01-01), Miller
patent: 3010156 (1961-11-01), Smith
patent: 3193900 (1965-07-01), Wendt
patent: 3554087 (1971-01-01), Florjancic
patent: 3557663 (1971-01-01), Florjancic
patent: 3664799 (1972-05-01), Wallick et al.
patent: 4140470 (1979-02-01), Pasch
patent: 4306852 (1981-12-01), Mateev et al.
patent: 4350486 (1982-09-01), Croseck et al.

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