Method for manufacturing drip irrigation tubes
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United States of America Patent
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-
Apr 28, 1998
Grant Date -
N/A
app pub date -
Dec 6, 1995
filing date -
Dec 7, 1994
priority date (Note) -
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status (Latency Note)
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Abstract
A continuous tube (1) is prepared by extrusion of a plastic material. Flow regulators or 'drips' (4) are welded at intervals onto its internal wall, said drips comprising a collecting chamber, which is provided on the face turned towards the tube (1), and connected, by a narrow passage, to the interior of the tube. The tube is moved continuously in front of a non contact detector, preferably a capacitive sensor (40) which detects the beginning or the end of the passing of a flow regulator before it. One thus controls, as a function of the detector signals, perforation in the wall of the tube, of a hole connecting the collecting chamber to the exterior, with the aid of a laser (42), preferably a Nd:YAG laser and a focusing optic (44).
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