Process for producing mouldings from an expanded styrene polymer
AssigneeM. Y Trondex Limited
InventorsNorman W. Bibby, Oskar L. Willi
Life of this patent
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Abstract
A process for producing a moulding from an expanded styrene polymer. This process comprises applying gas pressure to particles of the polymer, introducing the particles under pressure into a mould, and reducing the pressure to allow at least some of the particles to expand in the mould and bond together to form the moulding.
Claims13
A non-calendering, non-compression molding, expansion process for producing a moulding from a pre-expanded styrene polymer, said process comprising:
- applying gas pressure to particles of a pre-expanded styrene polymer substantially free of residual expanding agent sufficient to compress the particles to a volume of 90% of the original volume or less than 90% of the original volume;
- introducing the particles into a mould;
- and
- modifying the gas pressure inside the mould, without modifying mould volume, to allow said particles to expand in the mould and bond together to produce the moulding.
A non-calendering, non-compression molding, expansion process for producing a moulding from a pre-expanded styrene polymer, said moulding process comprising:
- applying gas pressure to particles of a pre-expanded styrene polymer substantially free of residual expanding agent sufficient to compress the particles to a volume of 90% of the original volume or less than 90% of the original volume;
- wherein said particles have a density in the range of from 5 to less than 10 grams/liter prior to applying said gas pressure;
- introducing the particles into a mould;
- and
- modifying the gas pressure inside the mould, without modifying mould volume, to allow said particles to expand in the mould and bond together to produce a moulding.
A non-calendering, non-compression molding, expansion process for producing an elastified moulding from a pre-expanded styrene polymer, said elastifying molding process comprising:
- applying gas pressure to particles of a pre-expanded styrene polymer substantially free of residual expanding agent sufficient to compress the particles to a volume of 90% of the original volume or less than 90% of the original volume;
- introducing the particles into a mould;
- and
- modifying the gas pressure inside the mould to allow said particles to expand and elastify in the mould and bond together to produce the elastified moulding.
Dependencies are inferred from the claim text.