Method for manufacturing a drip irrigation tube and dripper unit therein
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United States of America Patent
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-
Jan 30, 2001
Grant Date -
N/A
app pub date -
Apr 13, 1998
filing date -
Apr 18, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
This method consists essentially in manufacturing dripper units (4) and attaching them longitudinally to a thread (16) by positioning them at intervals along the latter. For this purpose, the thread (16) is introduced into at least one notch (9) of the dripper unit (4) so as to clamp it. The width of the notch is less than the diameter of the thread. The thread fitted with dripper units is introduced into the tube (1) while the latter is being formed in an extruder so as to draw the dripper units (4) therein one after the other. The dripper units are then heat welded to the inner wall of the tube during its formation. The insertion of the thread (16) into the notch (9) is achieved via a wheel (18) onto whose the edge it is guided. In this manner, the whole method can be implemented continuously without any intermittent operations.
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