Sizing tool
AssigneeJRT-Finland Oy
InventorReijo Lehtinen
Life of this patent
Estimating the term…
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.
Claims16
A sizing tool for sizing extruded plastic tubing, comprising:
- a peripheral wall having an inner surface that defines the outer dimension of a plastic tubing and having a length defined between a plastic tubing inlet at one end of said peripheral wall and a plastic tubing outlet at an opposite end of said peripheral wall;
- a lubricating water channel system in said peripheral wall which includes at least one continuous lubricating channel in said peripheral wall extending along substantially the whole of said length and having at least one opening communicating said lubricating channel with said inner surface of said peripheral wall;
- a cooling medium channel system also in said peripheral wall which includes at least one continuous channel in said peripheral wall extending substantially along the whole of said length, said cooling medium channel system being closed within said peripheral wall and being separate from said lubricating water channel system;
- each of said at least one cooling medium channel and said at least one lubricating water channel being distributed around a periphery of the peripheral wall;
- and
- means for pressing the plastic tubing against said inner surface of said peripheral wall.
Dependencies are inferred from the claim text.