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US 4,315,050 AGranted
Laminates structure of an expanded core panel and a flat sheet of material which does not easily bond and a process for making the same
AssigneeNorfield Corporation
InventorRosemary Rourke
Life of this patent
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Abstract
A method of bonding a sheet of hard to bond thermoformable material to a core made of expanded thermoformable material is disclosed. The sheet of thermoformable material is heated to its glass transition temperature and then pressed into voids in the core forming a mechanical bond in addition to the chemical bond.
Claims14
A method of forming a composite member having a panel of expanded thermoformable material with a plurality of voids, as a core and at least one sheet of the same material attached thereto, comprising the steps of:
- disposing at least one face portion of a layer of expanded thermoformable material adjacent to a face portion of a layer of a sheet of same material;
- disposing the layers between two platens of a press;
- heating at least one platen adjacent to the sheet of the same material to its melting temperature at the point of contact between said layers;
- moving said presses together thereby squeezing material from the sheet of the same material into voids of said expanded thermoformable material;
- cooling said at least one platen;
- and
- removing said composite member from said platnes.
4 more elements
Dependencies are inferred from the claim text.