Multi-layer medicinal tablet forming machine and method for usin

Details Multi-layer medicinal tablet forming machine and method for usin Multi-layer medicinal tablet forming machine and method for usin

1991-04-12

1992-10-27

Theisen, Mary Lynn

Plastic and nonmetallic article shaping or treating: processes

Forming articles by uniting randomly associated particles

Stratified or layered articles

264120, 425345, 425353, 425355, B29C 4320

Patent

active

051587289

ABSTRACT:
An apparatus for forming a generally cylindrical two-layer, vertically-compressed tablet having a longitudinal axis longer than its diameter is provided in which a generally cylindrical die cavity is provided on a die table with the longitudinal axis of the die cavity being vertically disposed. An upper punch provided above the die cavity rides on an upper cam assembly which controls the movement of the upper punch to and from the die cavity. A lower punch provided below the die cavity rides on a lower cam assembly which raises and lowers the lower punch relative to the die cavity. In operation, the lower punch is positioned and a first powder is added in a metered amount to the die cavity. The upper punch then tamps down the first powder within the die cavity. The lower punch is positioned to receive a metered amount of a second powder in the die cavity above the first powder. The powder in the die cavity is compressed by shifting pressure wheels which prevent the powders from adhering to the wall of the die cavity. After the powder is compressed to form a tablet, the tablet is ejected from die cavity and taken out an ejection chute.

REFERENCES:
patent: 2068619 (1937-01-01), Bailey
patent: 2350971 (1944-06-01), Pecker
patent: 3158109 (1964-11-01), Stott
patent: 3332367 (1967-07-01), Sperry et al.
patent: 3545007 (1970-12-01), Hamilton
patent: 3555608 (1971-01-01), Maekawa et al.
patent: 3840631 (1974-10-01), Alexander, Jr.
patent: 4832880 (1989-05-01), Staniforth
patent: 5089270 (1992-02-01), Hampton et al.

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