Plastic article or earthenware shaping or treating: apparatus – Distinct means to feed – support or manipulate preform stock... – Extrusion shaping means
Patent
1990-12-14
1992-06-16
Woo, Jay H.
Plastic article or earthenware shaping or treating: apparatus
Distinct means to feed, support or manipulate preform stock...
Extrusion shaping means
264172, 2642101, B29C 4702
Patent
active
051220440
ABSTRACT:
Apparatus for producing a drip irrigation conduit having discrete internally located emitter units bonded at axially spaced apart locations of an internal surface thereof, wherein the irrigation conduit is continuously extruded from an extrusion cross head at a first outer diameter and a first linear velocity and is drawn off through a calibrator unit to a second and lesser outer diameter at a second and greater linear velocity (greater than the first linear velocity), the emitter units being continuously supplied on a carrier member which extends from within the extruder cross-head to the region of an inlet of the calibrator unit. While so supported the emitter units are accelerated so as to attain an emitter unit linear velocity substantially equal to said second linear velocity and are displaced at this velocity into contact with the extruded conduit where the latter has substantially attained its second linear velocity and therefore continue to be displaced while still supported in contact with the extruded conduit until the emitter unit is heat welded.
REFERENCES:
patent: 2484965 (1949-10-01), Slaughter
patent: 2575138 (1951-11-01), Slaughter
patent: 3895085 (1975-07-01), Suzuki et al.
patent: 3981452 (1976-09-01), Eckstein
patent: 4307841 (1981-12-01), Mehoudar et al.
patent: 4423838 (1984-01-01), Dinur
patent: 4473525 (1984-09-01), Drori
patent: 4573640 (1986-03-01), Mehoudar
Hydro-Plan Engineering Ltd.
Matney, Jr. W. J.
Woo Jay H.
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