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1. (WO2018046908) VACUUM FORMING A LAMINATE CHARGE

Pub. No.:    WO/2018/046908    International Application No.:    PCT/GB2017/052591
Publication Date: Fri Mar 16 00:59:59 CET 2018 International Filing Date: Thu Sep 07 01:59:59 CEST 2017
IPC: B29B 11/16
B29C 70/44
Applicants: THE UNIVERSITY OF BRISTOL
Inventors: WALLACE, Alexander Stephen
Title: VACUUM FORMING A LAMINATE CHARGE
Abstract:
In a forming step, a suction force is generated between a forming tool (10) and an impermeable sheet (60) which causes the impermeable sheet to press the laminate charge against a male corner (6, 8) of the forming tool and into a female corner (7, 9) of the forming tool. The male corner is positioned between first and second parts of the laminate charge, and the female corner is positioned between second and third parts of the laminate charge. During the forming step, gas is injected between the forming tool and part of the laminate charge to create a gas cushion between the forming tool and the third part of the laminate charge. This gas cushion inhibits the third part of the laminate charge from becoming clamped against the forming tool as the laminate charge is pressed into the female corner of the forming tool.