Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By gas forming or expanding
Patent
1978-12-18
1980-11-18
Anderson, Philip
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By gas forming or expanding
64 1C, 64 1S, 64 2R, 64 13, 193 35F, 264101, 264177R, 308215, 425328, 425376B, 425817C, B29D 2700, B29F 3012
Patent
active
042345294
ABSTRACT:
An improved method and apparatus is disclosed for shaping and forming plastic foams as a foamable extrudate is extruded through the orifice, preferably arcuate, of an extrusion die. Immediately adjacent and downstream of the die orifice are opposed sets of curved rollers, each having substantially the same center of curvature as the die orifice. The roller set on one side of the extrudate pass line is adjustable as a set with respect to and substantially parallel to the pass line, while the rollers of the set on the opposite side are adjustable individually each to float with controlled pressure against the extrudate as it expands and moves between the roller sets. Each roller is comprised of a plurality of thin, cylindrical, circular wafers which are drivingly interconnected and journaled on curved core shafts. The wafers of opposed rollers in each set are individually driven for rotation at a controlled speed so that each opposed pair of rolls acts as a traction drive for the extrudate as it exits radially from the die orifice, such rollers controlling the expansion and movement of the extrudate while minimizing cell distortion. A surface finisher is provided downstream of the roll sets which comprises opposed extrudate engaging planar surfaces positioned on opposite sides of the extrudate, one being adjustably yet fixedly supported while the other is adjustably and floatingly supported pivotally at its center of gravity to exert a controlled floating pressure on the extrudate.
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Anderson Philip
Condec Corporation
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