Film-forming head

US4145173A · kind A · utility

Assignee

• Saint-Gobain Industries · FR

Inventors

• Rudolf Pelzer · Herzogenrath, DE
• Heinz Scholl · Eschweiler, DE

Key dates

• Filing date: Mar 31, 1977
• Grant date: Mar 20, 1979
• Expiry date: Mar 31, 1997

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29C48/313
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

Apparatus and a method for forming a uniform film of plastic material, having good optical characteristics, on a substrate are disclosed. The plastic material is supplied to and maintained under pressure in a distribution channel and is fed from the distribution channel through a narrow slot to the substrate. A forming member subsequently forms the plastic material into a uniform film on the substrate. The level of the plastic material in front of the forming member is limited to a range of values based upon the thickness of the film being formed.