Irrigation tape and method of producing same
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United States of America Patent
Stats
-
Dec 31, 1991
Grant Date -
N/A
app pub date -
Jun 9, 1989
filing date -
Oct 9, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A drip irrigation tape and a method and apparatus for manufacture of same in which there are foils of thermoplastics material formed and sealed to produce a main waterway extending along the tape, and a series of tortuous flow restricting channels which are formed in a further foil by forming these in a channel shape mould on a drum, each channel communicating at one position with the waterway and having an outlet at another position to give a drip feed from each channel, the invention further including using an extrusion of thermoplastics foil directly from an extruding machine into such a forming machine, effecting an aperture from the tortuous channel to the main waterway by using a heated finger, effecting an outlet from the tortuous channel by providing an offset channel part which can then be nicked with a hot blade, and effecting an improved sealing together by using spaced apart dimples in providing joining fusing pressure.
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Cited Art Landscape
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