Method for manufacturing drip irrigation tubes

Details Method for manufacturing drip irrigation tubes Method for manufacturing drip irrigation tubes

1995-12-06

1998-04-28

Evans, Geoffrey S.

Electric heating

Metal heating

By arc

239542, B23K 2600

Patent

active

057447799

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).

REFERENCES:
patent: 3874598 (1975-04-01), Havens
patent: 4095084 (1978-06-01), Shutt
patent: 5022940 (1991-06-01), Mehoudar
patent: 5181659 (1993-01-01), Ohe
patent: 5282916 (1994-02-01), Bloom
patent: 5324371 (1994-06-01), Mehoudar

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