Method and apparatus for closing the end of an extruded tube submerged in water

Abstract From the Canadian patent

In the direct extrusion of tubing wherein the extruded tube or tubing is immediately submerged into water after extrusion and having a closed leading end the trail-, ing end thereof in the extrusion press is sealed off from the entrance of air and/or water by a crimping device consisting of a tool having a rounded front end which engages and forces through the operation of a piston cylinder assembly one wall inwardly of the trailing end against an opposed wall to form a collapsed double wall cross section.