Control device for the mechanical thermal adjustment of the nozzle of an extruder for elongate products
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United States of America Patent
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-
Jan 17, 1995
Grant Date -
N/A
app pub date -
Oct 13, 1993
filing date -
Oct 16, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to a control device for the mechanical or thermal adjustment of the nozzle (1) of an extruder for elongate products (2). In order to eliminate components for wall thickness fluctuations in the longitudinal direction of the elongate product (2) when determining the wall thickness of the elongate product (2) over its width or its periphery, a stationary ultrasonic measuring head (3) is provided in addition to a rotating or reversing ultrasonic measuring head (4). The measured values of the two measuring heads (3, 4) are so linked to one another in an evaluating unit (5) that it is possible to derive therefrom for the controller a correcting variable which leads to an adjustment of the nozzle (1) only if the wall thickness deviations discovered are due to an adjustment error at the nozzle (1).
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