Extrusion molding process

Details Extrusion molding process Extrusion molding process

2006-08-15

2006-08-15

McDowell, Suzanne E. (Department: 1732)

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

Controlling fluid pressure in direct contact with molding...

C264S045100, C264S209300, C264S247000, C264S297700, C264S515000, C264S516000, C264S524000, C264S540000, C264S571000, C264S572000

Reexamination Certificate

active

07090791

ABSTRACT:
A molding process is disclosed in which an extruded column of plastic is introduced into a mold cavity having a predetermined surface profile. A region of negative air pressure is created inside the mold cavity, exterior to the extruded column. The negative air pressure is applied to the exterior of the extruded column to draw the extruded column into contact with the entire surface profile of the mold cavity, to produce a molded article. The invention can also include a step of co-extruding multiple types of plastic resulting in an extruded column having multiple layers, to produce a molded article having multiple layers. The present method also includes a step of internally inserting a component into the extruded column at a predetermined position so that it will end up at a predetermined position of the molded article after the molding process.

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