Porous irrigation pipe prepared from particulate elastomer and t

Details Porous irrigation pipe prepared from particulate elastomer and t Porous irrigation pipe prepared from particulate elastomer and t

1984-01-24

1985-05-14

Welsh, Maurice J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

264 41, 264 459, 264 53, 264109, 264122, 264123, 521 91, 521 93, 521140, 524399, 524400, 524451, 525197, 525198, 525232, A01G 2700

Patent

active

045173168

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 320.degree. F. to 400.degree. F. (T.sub.1, T.sub.2, T.sub.3). The die has a separate jacket (90) receiving heat exchange fluid for heating the die (68) to a temperature from 290.degree. F. to 380.degree. F. to form a porous pipe (88) having more uniform porosity. Porosity is controlled by selecting water content of the pellets and controlling die temperature.

REFERENCES:
patent: 4003408 (1977-01-01), Turner
patent: 4110420 (1978-08-01), Turner
patent: 4168799 (1979-09-01), Turner
patent: 4391767 (1983-07-01), Pears
patent: 4397916 (1983-08-01), Nagano

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