The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 09, 1979
Filed:
Mar. 16, 1977
Applicant:
Inventor:
Erwin W Wartenberg, Stuttgart, DE;
Assignee:
Cordotex SA, Lausanne, CH;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B29F / ;
U.S. Cl.
CPC ...
15624427 ; 427361 ; 427362 ; 427365 ; 427369 ; 4273 / ;
Abstract
Adhesion between extruded polyethylene film and a substrate consisting of paper or paper lined metal foil is improved when the substrate and film are pressed together by passing through rollers which also cool the film to below its softening temperature, wherein at least one of said rolls which is brought into contact with the polyethylene coating is moistened on its rolling surface with a liquid having a critical surface tension below 73 dyne/cm, a boiling point below 100.degree. C and consisting of a mixture of water and between 10% and 50% ethyl alcohol.