B - Operations – Transporting – 32 – B
Patent
B - Operations, Transporting
32
B
B32B 5/18 (2006.01) B29C 44/12 (2006.01) B29C 44/14 (2006.01) B32B 5/24 (2006.01) B32B 5/28 (2006.01) C08J 5/12 (2006.01) C08J 9/34 (2006.01) B32B 31/20 (1990.01)
Patent
CA 2101678
A method of producing a sandwich plate that consists of a foamed core layer and two fiber-reinforced cover layers, comprising the steps of providing a sheet of a thermoplastic plastics material, such as polyetherimide, containing an amount of a suitable solvent or blowing agent; placing said sheet between two fiber-reinforced layers of a similar thermoplastic material, such as polyetherimide; placing the core web and cover layer assembly between two pressure plates; applying heat and pressure to the pressure plates to cause foaming of the core web and cooling the pressure plates when predetermined foam layer thickness is obtained. According to one aspect of the invention one of the cover layers has a remaining percentage of solvent that does not exceed 0,1% of weight. According to a second aspect of the invention the thermo- plastic material in at least one of the cover layers is a modification having a higher chemical resistance than the thermoplastic material of the core layer.
de Groot Martin Theodoor
Fetherstonhaugh & Co.
LandOfFree
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