Apparatus for coating tablets

US6579365B1 · kind B1 · utility

Assignee

• GLATT AIR TECHNIQUES, INC. · US

Inventors

• David M. Jones · Ramsey, US
• Richard Andrew Smith · Middletown, US
• John P. Kennedy · Willmar, US
• Frank Maurer · Skokie, US
• Matthias Tondar · Eschborn, DE
• Bernhard Luy · Glückstadt, DE
• Markus J. Baettig · Sissach, CH

Key dates

• Filing date: Nov 17, 2000
• Grant date: Jun 17, 2003
• Expiry date: Dec 2, 2020

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S118/05
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A fluidized bed apparatus for applying a coating liquid onto the surface of particles includes a vertically disposed cylindrical product container having a peripheral wall, at least one cylindrical partition defining a centrally located up bed region and a peripherally located down bed region. The product container further includes an upper end connected to an expansion chamber and a lower end including an orifice plate having a plurality of openings for passage of fluidized air or gas. A nozzle is centrally located through the orifice plate and is adapted to generate a spray of coating liquid upwardly into the up bed. Particles located within the product container circulate upwardly through the partition and the coating liquid spray, between the up bed and the down bed. A plurality of inwardly directed discharge jets are positioned along the periphery of the product container and generally adjacent to the orifice plate. A source of pressurized air or gas is connected to the plurality of discharge jets and provide a radially inwardly directed flow of air or gas through the particles of the down bed so that the particles located adjacent to the peripheral wall of the product contain…