Patent · US Expired

Process for the production of needle felt from rock wool

US5057173A · kind A · utility

5Cited by

4References

13Claims

0Family size

Assignee

Grunzweig & Hartmann AG · DE

Inventors

Lothar Bihy · Kaiserslautern, DE
Hans Kummermehr · Ludwigshafen, DE
Reinhard Stoyke · Dudenhofen, DE

Key dates

Filing date	Sep 26, 1989
Grant date	Oct 15, 1991
Priority date	—
Expiry date	Sep 26, 2009

Classification

Technology area (CPC D)Textiles; Paper
CPC primaryD04H1/46
WIPO fieldTextile and paper machines
WIPO sectorMechanical engineering

Abstract

By combining two measures, namely by using rock wool fibers with a particularly low fiber thickness, and by adding an avivage agent with an unusually high viscosity, it is possible to needle a rock wool felt, without adding any other fibers, to produce a needle felt with high strength and good bendability. If the needle felt is subsequently relaxed with heat treatment, and the avivage agent is also expelled during this treatment, the needle felt is then available as a pure rock wool needle felt, free of any organic additives.

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