Patent · US Expired

Process to increase the resistance to tearing of a heat-resettable material web

US5480692A · kind A · utility

2Cited by

8References

15Claims

0Family size

Assignee

Stewing Nachrichtentechnik GmbH & Co. · DE

Inventors

Norbert Nicolai · Schermbeck, DE
Heinz Koppe · Castrop-Rauxel, DE
Thomas Schwabe · Hales Corners, US
Jurgen Vogel · Leuna, DE

Key dates

Filing date	Apr 22, 1994
Grant date	Jan 2, 1996
Priority date	—
Expiry date	Apr 22, 2014

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/1331
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

A process to increase resistance to tearing in a heat-resettable material involves extruding a polymer of a specified crosslinking density to produce a plastic web. After cooling the plastic web is heated by creating a temperature decreasing towards its core and stretched at core temperature below crystalline melting temperature of partially crystalline and crystalline polymers resulting in a distribution of orientation over the full section of the plastic web. Resistance to tearing will be essentially increased in this manner based on a simple, low-cost production process.

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