Process and apparatus for making multiply sheets

US4180426A · kind A · utility

Assignee

• Saint-Gobain Industries · FR

Inventors

• Georges Oustin · Waibstadt, DE
• Helmut Krumm · Aachen, DE

Key dates

• Filing date: Jul 11, 1974
• Grant date: Dec 25, 1979
• Expiry date: Jul 11, 1994

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B32B17/10853
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

Multiply windows are made by assemblying an interlayer of thermoplastic adhesive between plies of the sheet, subjecting the outer surfaces of the plies and the interlayer to vacuum, and subjecting the evacuated assembly to heat and pressure sufficient to bond them together while maintaining the vacuum. Apparatus is provided for this operation which includes an autoclave, means to establish a selected temperature within the autoclave, means to establish a selected pressure within the autoclave, flexible sack means within the autoclave, means to seal the sack means about a multiply sheet, and vacuum means connected to the interior of the sack means.