Foam molding method, foaming agent and foamed plastic
AssigneeLG Electronics Inc.
InventorsChanghoon JEONG, Daejin Jeong, Gangyoun Kim
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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.
Claims22
A foam molding 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.
A foam molding 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.
A foaming agent for producing a foamed plastic by producing a gas when a plastic raw material to be foam-molded is melted, wherein the foaming agent comprises:
- a granular or powdered foaming compound;
- and
- a cell for accommodating the foaming compound, wherein the cell is decomposed during melting of the raw material.
A foamed plastic, comprising:
- a foamed raw material having pores distributed therein, the pores being formed by a gas generated by a chemical reaction in a foaming agent mixed with a melted raw material;
- and
- at least one of sodium oxide (Na2O) or sodium carbonate (Na2CO3) residue left by the generation of gas from the foaming agent.
Dependencies are inferred from the claim text.