Patent · US Expired

Dotting of molding tools with droplets

US4707309A · kind A · utility

14Cited by

5References

5Claims

0Family size

Assignee

Dr. Karl Thomae GmbH · DE

Inventors

Gunther Voss · Dießen am Ammersee, DE
Volker I. Glasel · Biberach, DE
Peter Gruber · Bottmingen, CH
Walter Bubeck · Biberach, DE

Key dates

Filing date	Mar 27, 1984
Grant date	Nov 17, 1987
Priority date	—
Expiry date	Mar 27, 2004

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S425/115
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

The invention is directed to a process for dotting molding tools with droplets of liquid or suspended lubricant in the production of shaped articles in the pharmaceutical, food, or catalyst fields. Pressurized lubricant solutions or suspensions and pressurized gas are alternately passed through capillaries, in conjunction with alternating single-substance nozzles, in such a way that drops are formed on the nozzle surface, in between the jets of gas, and are then detached form this surface and directed to specific zones of pressing tools. The apparatus comprises fast-acting valves for the brief release of pressurized gases and lubricant liquids or suspensions. The delivery lines of a gas valve and a liquid valve combine upstream of a capillary, and single-substance nozzles are mounted at the end of the capillaries.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.