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US 9,080,023 B2Granted
Foam molding method, foaming agent and foamed plastic
AssigneeLG Electronics Inc.
InventorsChanghoon Jeong, Daejin Jeong, Gangyoun Kim
Life of this patent
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Abstract
A foam molding method, a foamed plastic formed by the method, and a foaming agent used in the foam molding method are provided. The foam molding method may include rotating a screw provided in a barrel, feeding a granular or powdered raw material and a foaming agent into the barrel, the foaming agent producing foam through a chemical reaction, melting the fed raw material and producing a gas from the foaming agent, and phase-changing the produced gas to a supercritical state and mixing the gas with the melted raw material.
Claims13
A method, comprising:
- rotating a screw provided in a barrel;
- feeding a granular or powdered raw material and a foaming agent into the barrel;
- melting the fed raw material, and producing a gas from the foaming agent;
- and
- phase-changing the produced gas to a supercritical state and mixing the gas in the supercritical state with the melted raw material.
2 more elements
A method, comprising:
- feeding a granular or powdered raw material and a foaming agent into a first zone of a barrel as a screw provided in the barrel rotates;
- melting the raw material and producing a gas from the foaming agent in a second zone of the barrel as the raw material and the foaming agent move along the barrel in response to rotation of the screw within the barrel;
- and
- further producing the gas, in a third zone of the barrel, from a residue of the foaming agent left after production of gas in the second zone.
1 more element
Dependencies are inferred from the claim text.