Filter manufacturing machine, filter manufacturing method using the machine, and hollow filter
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United States of America Patent
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-
Aug 30, 2016
Grant Date -
Feb 6, 2014
app pub date -
Sep 27, 2013
filing date -
Mar 31, 2011
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A filter manufacturing machine includes a forming device for forming filter tow into a hollow rod-shaped continuous filter body, a forming tube included in the forming device and having a tubular forming path through which the filter tow is passed while being brought together, a mandrel arranged in the forming tube and forming the tubular forming path in cooperation with the forming tube, and a heat treating section included in the forming tube and configured to heat the filter tow while the filter tow passes through the tubular forming path. The mandrel has a small-diameter portion located at the inlet of the forming tube, a large-diameter portion located at the outlet of the forming tube, and a diameter expansion portion located between the small- and large-diameter portions. The diameter expansion portion is located downstream of the heat treating section as viewed in the moving direction of the filter tow.
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