Method for producing structural foam and products containing structural foam
AssigneeKeter Plastic Ltd.
InventorEfraim Haimoff
Life of this patent
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Abstract
Provided is a method for generating structural foam having a density in the range of from 0.4 to 0.75 gr/cm3. A gas is generated in a plastic melt under conditions inhibiting bubble formation in the melt. The melt is injected into a mold and the volume of the mold is varied to produce a structural foam having a density in the specified range. Also provided is a sheet of structural foam having a density in the range of from 0.4 to 0.75 gr/cm3 and a panel including a sheet of structural foam. Also provided is a structure including two or more panels. The structure may be, for example, a cabinet, cupboard, shed or piece of furniture.
Claims12
1-11. (canceled)
A method for generating structural foam having a density in the range of from 0.4 to 0.75 gr/cm3 comprising:
- plasticizing plastics granules to form a polymer melt;
- generating a gas in the melt under conditions inhibiting bubble formation in the melt;
- closing a mold to an initial volume V1;
- injecting a volume V2 of the melt into the mold, where V2<V1;
- compressing the mold from the volume V1 to the volume V2;
- and
- expanding the mold from the volume V2 to a final volume V3;
- wherein V1, V2, and V3 are selected to produce a structural foam having a density in the range of from 0.4 to 0.75 gr/cm3.
A panel comprising a sheet of structural foam according to claim
Dependencies are inferred from the claim text.