Patent · US Expired

Multiple-layer tubing

US4287217A · kind A · utility

24Cited by

11References

43Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Klaus-Dieter Hammer · Mainz, DE
Martin Schroder · Nottingham, GB
Horst Pietruck · Bad Kreuznach, DE
Max Bytzek · Naurod, DE

Key dates

Filing date	Aug 4, 1978
Grant date	Sep 1, 1981
Priority date	—
Expiry date	Aug 4, 1998

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/1324
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

Disclosed is a multiple layered film preferably in the form of a tube and being suitable for forming sausage casings, comprising: a central layer of a cellulose hydrate-based material; a first layer on the inside of the central layer, comprising a film of thermoplastic synthetic resinous material and being impermeable to water and water vapor; and a second layer on the outside of the central layer, comprising a synthetic elastic copolymer and being permeable to water and water vapor. Also disclosed is a method for preparing these film products.

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