Drip irrigation hose and method for its manufacture

Fluid sprinkling – spraying – and diffusing – Conduit or nozzle attached irrigation-type decelerator

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Details

23953313, B05B 1500

Patent

active

058653775

ABSTRACT:
A drip irrigation hose of the continuous emitter type in which the outlets from the regulating passage each comprise a single longitudinal slit. By controlling the length of the slits and the flexibility of the film, water drips from the outlets when the hose is pressurized without clogging when the hose is depressurized. The slits are sufficiently long and the film is sufficiently flexible so the water drips from the outlets when the hose is pressurized. The slits are sufficiently short and the film is sufficiently rigid so the outlets close completely when the hose is depressurized. An outlet forming wheel has a knife blade on its periphery. A backing wheel engages the outlet forming wheel to establish a first nip therebetween. The backing wheel has on its periphery a circumferential slot into which the knife blade fits at the first nip. A rib forming wheel has around its periphery impressions that define a desired track pattern for the ribs. The outlet forming wheel and the rib forming wheel are mounted on a common shaft to operate in synchronism. A continuous strip of plastic film is directed in a path that reverses direction four times to accommodate these wheels.

REFERENCES:
patent: 3899135 (1975-08-01), O'Brian
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patent: 4779800 (1988-10-01), Tuomi
patent: 4984739 (1991-01-01), Allport
patent: 5123984 (1992-06-01), Allport et al.
patent: 5522551 (1996-06-01), DeFrank et al.
patent: 5634595 (1997-06-01), Defrank et al.
Hardie Irrigation product information sheet (no date).
Sample of Hardie Irrigation product with slit open to expose inside (Hardie Tape).

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