Patent ID: 6814559
Filing Date: 2004-11-09
Classification: B29C

Abstract:
A shaping apparatus for an extrusion system with at least one calibration device comprising(a) at least one calibration die with several calibration units disposed one after another in an extrusion direction, each calibration unit having (1) at least one calibration orifice with several shaping surfaces which come into contact with an article fed therethrough, (2) end faces spaced apart from each other in the extrusion direction, and (3) side faces extending between the end faces, a first end face being directed towards an inlet region and a second end face being directed towards an outlet region of the article fed through the calibration orifice, (b) at least one cavity formed between two immediately adjacent calibration units, the cavity extending from a respective one of the shaping surfaces to, and opening into, a passage, (c) means for dispersing heat, and (d) wherein the calibration orifice is provided with (1) at least one continuous circulation passage around a predominant part of, and immediately adjacent to, the circumference thereof, the circulation passage having a separate inlet and outline line, extending across a predominant distance of a thickness between the two end faces of the calibration unit and being closed in the region of the end faces, the circulation passage is provided with at least one transverse passage along the circumferential extension thereof extending across a predominant distance of the thickness between the end faces, the transverse passage being closed at the region of the two end faces and having a flow connection to the circulation passage via at least one connecting passage, and (e) a baffle system projecting from the connecting passage in a direction opposite the calibration orifice, at least in certain regions, into the flow cross-section of the circulation passage.