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1. (WO1985003194) POROUS IRRIGATION PIPE AND METHOD

Pub. No.:    WO/1985/003194    International Application No.:    PCT/US1985/000118
Publication Date: Aug 1, 1985 International Filing Date: Jan 22, 1985
IPC: A01G 25/06
B29B 17/00
B29B 17/04
B29B 9/06
B29C 47/00
B29D 23/00
Applicants: MASON, James, W.
Inventors: MASON, James, W.
Title: POROUS IRRIGATION PIPE AND METHOD
Abstract:
A mixture of crumb rubber, binder, such as polyethylene, and slip contact agent, such as talc, and lubricant, such as a metal stearate, is formed in a blender (10), is shaped into pellets (32) by extruding a strand of the mixture (26) into water (28) and breaking the strand into pellets. The pellets (32) are adjusted to a preselected water content in drier (46) before storage in closed bags (50), stored and reinforced in a container (54). The controlled water content pellets (32) are formed into porous pipe (88) by extrusion in pipe extruder (62) having the feeding, transition and metering zones separately heated to temperatures from 320oF. to 400oF. (T1, T2, T3). The die has a separate jacket (90) receiving heat exchange fluid for heating the die (68) to a temperature from 290oF. to 380oF. to form a porous pipe (88) having more uniform porosity. Porosity is controlled by selecting water content of the pellets and controlling die temperature.