American Maplan Corporation

Robert F Shamet

Steven E Spence

Flavio R Da Silva

Horst Eigruber

A safety plug for an extrusion apparatus for extruding pipe is provided with a valve opening when its tether to the extrusion die breaks. The valve can be formed by a disk on a rod which is axially displaceable in a tubular body having a flange forming a valve seat for the disk of the rod. The rod is connected to the chain.

Safety air plug and extrusion apparatus using same

A triple-wall foam coextrusion apparatus in which inner and outer layers of one synthetic resin material are coextruded with an intermediate layer of another synthetic resin material, and wherein the passages for the first material are inclined to the axis along which the second material is extruded around a spider to ensure uniform flow.

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McPherson, KS, United States of America

Robert F Shamet