Rotary tablet press and method for pressing tablets in a rotary tablet press

Patent metadata

Field	Value
Publication number	US-10207433-B2
Application number	US-201615144167-A
Country	US
Kind code	B2
Filing date	May 2, 2016
Priority date	Jan 27, 2010
Publication date	Feb 19, 2019
Grant date	Feb 19, 2019

Abstract

The invention relates to a rotary tablet press comprising: a rotatingly drivable rotor, having a die plate comprising die holes and assigned to the die holes upper and lower punches, rotating synchronously with the die plate, whose axial movement is controlled by upper and lower control cams, having at least one filling station comprising at least one filling device for filling the die holes with material to be pressed, having at least one compression station disposed downstream of the filling station in the rotational direction of the rotor, comprising at least one pressing device which presses the upper and/or lower punches into the die holes when passing through the compression station in order to press the filled material in the die holes, and having at least one ejector station, disposed downstream of the compression station in the rotational direction of the rotor, comprising an ejector device for ejecting the pressed tablets in the die holes, characterized in that at least one vibration generator is provided in the circumferential direction of the upper and lower punches between the filling station and the ejector station that at least temporarily vibrates the upper and/or lower punches at least at the compression station and/or at the filling station and/or at least at an upper control cam and/or at least at a lower control cam.

First claim

The invention claimed is:

1. A method for pressing tablets in a rotary tablet press, comprising the steps of:
providing a rotor, having a die plate comprising die holes and upper and lower punches which are assigned to the die holes and which rotate synchronously with the die plate, the axial movement of the upper and lower punches is controlled by upper and lower control cams, which are driven in a rotational manner;
filling the die holes, in course of a rotation, in at least one filling station, with material to be compressed;
compressing the material filled in the die holes in at least one compression station disposed downstream of the at least one filling station in a rotational direction of the rotor, with the upper and lower punches pressing into the die holes;
ejecting pressed tablets from the die holes in at least one ejector station, disposed downstream of the at least one compression station in the rotational direction of the rotor;
wherein the at least one compression station comprises a pre-compression station comprising an upper and lower pre-compression roller and a main compression station comprising an upper and lower main compression roller wherein the upper and/or lower punches are at least temporarily vibrated at the upper and/or lower pre-compression rollers of the pre-compression station and/or at the upper and/or lower main compression rollers of the main compression station,
wherein the at least temporary vibration of the upper and/or lower punches is effected by at least one vibration generator that is disposed at the pre-compression station and/or the main compression station, and
further wherein the pre-compression station, the at least one compression station and the at least one vibration generator do not rotate with the upper and lower punches and the die plate.

Assignees

• Fette Compacting Gmbh

Inventors

• Heinrich Thomas
• Schmidt Ingo
• Naeve Jan

Classifications

• B29L2031/00

  Other particular articles · CPC title

• B30B11/022 Primary

  whereby the material is subjected to vibrations · CPC title

• B30B11/08

  co-operating with moulds carried by a turntable · CPC title

• B29C43/006 Primary

  Pressing and sintering powders, granules or fibres · CPC title