Patent · US Expired

Process for producing press molded articles provided with channels from powdery molding compounds

US4853170A · kind A · utility

11Cited by

2References

4Claims

0Family size

Assignees

Hutschenreuther AG · DE
Eugen Buhler · DE

Inventors

Eugen Buhler · Thannhausen, DE
Klaus Strobel · Selb, DE
Karl Schwarzmeier · Selb, DE

Key dates

Filing date	Dec 3, 1987
Grant date	Aug 1, 1989
Priority date	—
Expiry date	Dec 3, 2007

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB28B7/183
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

A method for producing press-molded articles having a plurality of cavities therein includes a mold cavity which can be filled with a particulate molding compound, which mold cavity contains rods sheathed with expandable tubes which can be expanded by means of a fluid under pressure conveyed into the space between the rods and the tubes: this causes compaction of the molding compound to form the pressed article, which can be removed from the mold after reduction of the fluid pressure to allow detumescence of the expandable tubes and withdrawal of these from the mold cavity so that the mold cavity can be opened to remove the shaped pressed article.

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