B - Operations – Transporting – 29 – D
Patent
B - Operations, Transporting
29
D
18/663
B29D 27/00 (1980.01)
Patent
CA 1164173
Title: "Method and Apparatus for Shaping Plastic Foams" ABSTRACT OF THE DISCLOSURE 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 theopposite 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, suchrollers 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.
360006
Macrae & Co.
Owens Corning
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