Method of co-extrusion with foam core
AssigneeTri-Seal International, Inc.
InventorJoseph Dukess
Life of this patent
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Abstract
This invention relates to a method for a manufacture of plastic sandwich element in which a first extruder is charged with essential ingredients for productions of foamed cellular plastic at a predetermined temperature. A second extruder is charged with essential ingredients for production of solid plastic at a temperature of at least 25 degrees Farenheit below the predetermined temperature. The resulting sandwich is extruded through an extrusion die forming an integral plastic sandwich with the heat of the foamed plastic layer causing a partial melting.
Claims6
A method of manufacturing a coextruded article, comprising the steps of:
- mixing ingredients for a cellular plastic including a foaming agent and a thermoplastic material in a plastic state for forming a core at a predetermined temperature, mixing other ingredients for at least one solid thermoplastic material in a plastic state at a temperature lower than said predetermined temperature by at least 25 degrees Fahrenheit for forming a skin for said core, and then simultaneously coextruding said cellular plastic and said solid thermoplastic material through a die, said predetermined temperature being at least as high as the melt point of said skin to promote intermingling and intimate bonding of said skin and said core.
Dependencies are inferred from the claim text.