Patent · US Expired

Seamless tubular film and methods and devices for producing a seamless tubular film materials

US6821591B2 · kind B2 · utility

10Cited by

13References

20Claims

0Family size

Assignee

Kalle GmbH & Co. KG · DE

Inventors

Herbert Gord · Ingelheim am Rhein, DE
Klaus-Dieter Hammer · Mainz, DE
Rainer Neeff · Wiesbaden, DE
Klaus Berghof · Rudolstadt, DE
Markus Eilers · Rudolstadt, DE
Reinhard Maron · Rudolstadt, DE

Key dates

Filing date	Jul 20, 2001
Grant date	Nov 23, 2004
Priority date	—
Expiry date	Jul 20, 2021

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/1393
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

The present invention provides a seamless tubular film on a cellulose base, being produced by extruding an aqueous cellulose N-methyl-morpholine-N-oxide spinning solution. The maximum degree of roughness Rmax is from greater than 0.1 &mgr;m to 0.5 &mgr;m and an average degree of roughness Rm is from 0.005 to 0.014 &mgr;m. On the surface of the tubular film is formed in contact with an electrolyte an electrokinetic potential, the size of which depends on the pH value of the electrolyte.

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