Microwave drying of pharmaceutical gelatin capsules

Details Microwave drying of pharmaceutical gelatin capsules Microwave drying of pharmaceutical gelatin capsules

1986-11-03

1988-01-26

Schwartz, Larry I.

Drying and gas or vapor contact with solids

Apparatus

With means to treat gas or vapor

34 68, 34105, F26B 2308

Patent

active

047209240

ABSTRACT:
A machine for the manufacture of gelatin pharmaceutical capsules is disclosed, in which microwave drying is used. The drying section of the machine has two upper tunnels and two corresponding return tunnels beneath them, through which pin bars carrying the hot moist gelatin capsule halves pass. Microwave transmitters are positioned above the upper tunnels to transmit microwave energy towards the capsule halves for drying. Inlet ducts along the outer sides of the upper tunnels supply cool, dry air which flows through apertures in the tunnel side walls and across the tunnels to an exhaust duct. The return tunnels also have a conditioned air system, supplied through ducts above the return tunnels having apertured bottom plates, for fine tuning the temperature and moisture content of the capsules prior to final processing operations.

REFERENCES:
patent: 3670132 (1972-06-01), Kaufman, Jr. et al.
patent: 3699899 (1972-10-01), Schiffmann et al.
patent: 3916136 (1975-10-01), Anderson et al.
patent: 4419374 (1983-12-01), Pei
patent: 4428127 (1984-01-01), Grassmann
patent: 4441003 (1984-04-01), Eves, II et al.
patent: 4513513 (1985-04-01), Sayles
patent: 4609417 (1986-09-01), Smith

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