Puller speed control device for monitoring the dimensions of an extruded synthetic wood composition
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United States of America Patent
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Apr 17, 2012
Grant Date -
Apr 17, 2008
app pub date -
Oct 12, 2007
filing date -
Oct 16, 2006
priority date (Note) -
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Abstract
A system for controlling the dimensions of an extrudate exiting an extruder and for compensating for the variations in the extrusion rate of the extruder, expansion rate and rate of travel of the extrudate through sizing devices by changing the speed of an extrudate puller device, includes an extruder which extrudes the extrudate; a conveyor system comprising rollers and a series of sizing devices; a puller device for pulling the extrudate through the sizing devices; and a laser proximity measuring device to assist the system in keeping the desired shape of the extrudate. The laser proximity measuring device includes at least one pair of optical non-contact displacement transducers, a real time processor, and an interactive touch screen display unit. The transducers emit a laser beam which provides a laser point on the side of the extrudate.
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