Abstract: The invention relates to a seal structure for scaling the inlet/exit gate passageway of an elongated object (1) from a process cavity (A, B) or into such a cavity. The seal structure comprises sheet-metal structures, which essentially delineate the passageway and are removably mounted on the frame structure (3) of said process cavity, and a sweeping seal element (13) enclosing the passageway. The sheet-metal element structures comprise at least two sheet-metal elements (14, 15, 15x) that have a shape taperingly departing from the frame structure (3) of the process cavity so as to be inclined in the nominal travel direction of the object (1) are kept compressed mutually against each other so as to hold a seal element (13, 13x) therebetween.

Abstract: A sizing tool for extruding plastic tubing is disclosed. The tool includes a peripheral wall having an inner surface that defines the outer dimension of a plastic tubing advancing from an extruder through the tool under influence of an internal pressure exceeding the pressure prevailing in the tool. The tool also includes a lubricating water channel system in the peripheral wall and extending along the tool length and having at least one opening communicating with the inner surface of said peripheral wall. The tool also includes a cooling medium channel system in the peripheral wall and extending along the length. The cooling medium channel system being substantially closed within the peripheral wall and being separate from the lubricating water channel system.