Annular die and method for extrusion
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United States of America Patent
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Oct 8, 2019
Grant Date -
Oct 18, 2018
app pub date -
Jun 21, 2018
filing date -
Mar 5, 2012
priority date (Note) -
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Abstract
The invention relates to an annular die on an extrusion head for producing tubular or sheet-like preforms with an arcuate die gap and with a melt channel delimited by a mandrel and a die body, the cross-sectional profile of the melt channel being variable by way of adjusting elements, the annular die according to the invention being distinguished by the fact that the outer circumference of the melt channel is at least partially delimited directly by at least one radially adjustable slide, that the slide is formed by a number of segments that can be adjusted together from at least one first position into at least one second position, and that the segments in each position form a respectively closed arc portion of the delimitation of the melt channel, the radius of the arc portion being different according to the position of the segments.
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