Method and system for feeding a lubricating or releasing agent to pressing tools of a tablet press

Patent metadata

Field	Value
Publication number	US-10967597-B2
Application number	US-201715829266-A
Country	US
Kind code	B2
Filing date	Dec 1, 2017
Priority date	Dec 1, 2016
Publication date	Apr 6, 2021
Grant date	Apr 6, 2021

Abstract

A method and system for feeding a lubricating or releasing agent from a dosing station to one or more pressing tools arranged in a pressing chamber of a tablet press. The tablet press is configured with a feed pipe for feeding the lubricating or release agent from the dosing station to the one or more pressing tools of a pressing chamber of the tablet press and the feed pipe is configured with a shut-off valve disposed in-line with the feed pip for controlling the flow of the lubricating or release agent to the pressing chamber. The method comprises the steps of: producing a negative pressure with respect to the surroundings of the pressing chamber of the tablet press, measuring a pressure in one of the feed pipe and the pressing chamber, and issuing a signal indicative of the measured pressure and issuing an enable signal to open a valve in response to the pressure signal.

First claim

The invention claimed is:

1. A method for feeding a lubricating or releasing agent from a dosing station to one or more pressing took arranged in a pressing chamber of a tablet press, the tablet press having a feed pipe for feeding the lubricating or release agent from a dosing station to the one or more pressing tools of a pressing chamber of the tablet press, the feed pipe having a shut-off valve disposed in-line therewith for controlling a flow of the lubricating or release agent to the pressing chamber, the method comprising the steps of:
producing a negative pressure within the pressing chamber of the tablet press;
measuring a pressure in the feed pipe upstream of the shut-off valve;
measuring a pressure in the pressing chamber of the tablet press; and
issuing an enable signal when the pressure stream of the shut-off valve is greater than the pressing, chamber pressure by a given first limit pressure.

2. The method according to claim 1 , further comprising the step of issuing the enable signal when the pressure in the pressing chamber does not exceed a given second limit pressure.

3. The method according to claim 1 , further comprising the step of measuring one of a dynamic pressure before the dosing station and the pressure in the feed pipe between the dosing station and the shut-off valve to measure a pressure upstream of the shut-off valve.

4. The method according to claim 1 , further comprising the steps of:
measuring a dynamic pressure before the dosing station and the pressure in the feed pipe between the dosing station and the shut-off valve to measure a pressure upstream of the shut-off valve; and
issuing the enable signal when the dynamic pressure before the dosing station and the pressure in the feed pipe between the dosing station and the shut-off valve is higher than the pressing chamber pressure by the given first limit pressure.

5. The method according to claim 1 further comprising the step of issuing the enable signal in the absence of a locking signal.

Assignees

• Fette Compacting Gmbh

Inventors

• Heinrich Thomas
• Meisolle Stefan
• Schoeler Martin

Classifications

• B30B15/0082

  Dust eliminating means; Mould or press ram cleaning means · CPC title

• B30B15/00

  Details of, or accessories for, presses; Auxiliary measures in connection with pressing (safety devices F16P) · CPC title

• B29C43/006

  Pressing and sintering powders, granules or fibres · CPC title

• B29C2043/3427

  hopper, vessel, chute, tube, conveying screw, for material in discrete form, e.g. particles or powder or fibres · CPC title

• B29C43/58

  Measuring, controlling or regulating {(for bank adjustment in calendering B29C43/245)} · CPC title