Method for extruding cellular thermoplastic products

Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Composite article making

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264 469, 264 50, 264 53, 264 54, 264174, 264DIG5, 425113, 425817C, B29D 2700, B29F 310

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039729702

ABSTRACT:
A product comprising a cellular plastic material is extruded from a modified conventional extrusion head by injecting a gaseous expanding medium into advancing fluent plastic material through porous material forming at least a portion of a section of the core tube in an extrusion chamber. By controlling the interrelationship between various process parameters such as the speed and pressure of the advancing fluent plastic material, the rate of injection of expanding medium into the advancing plastic material, the place where the expanding medium is injected, and the amount the extruded product is allowed to expand before cooling, it is possible to extrude, from a single source of fluent plastic material, a product comprising many different configurations of cellular and solid plastic material such as a uniform cellular structure throughout, or a cellular plastic inner section with a more dense outer covering.

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