Process for making uniform porosity flexible irrigation pipe

Details Process for making uniform porosity flexible irrigation pipe Process for making uniform porosity flexible irrigation pipe

1989-05-03

1990-09-25

Thurlow, Jeffery

Fluid sprinkling, spraying, and diffusing

Porous or external wick discharge means

264 41, 264 459, 264178R, 2642093, 2642097, 26421121, 425 4C, 4253791, 425380, 425817C, A01G 2700

Patent

active

049587706

ABSTRACT:
This invention relates to the manufacture of flexible porous irrigation pipe having an essentially uniform porosity throughout its length which is produced by extruding an essentially moisture-free non-homogeneous, mixture of pre-vulcanized elastomeric particles such as reclaimed crumb rubber from vehicle tire treads in major amount and a thermoplastic polymer binder such as low-density polyethylene in minor amount. The mixture is intimately mixed and extruded from an unvented extruder through an annular extruder die at a precisely-controlled temperature and then through a lengthy cooling liquid bath, the rate of pull-off through the extruder die and liquid bath being maintained constant. The leak rate of the fluid delivered from the porous pipe is substantially uniform over a lengthy prescribed dimension exhibiting a delivery variation of less than about 5 percent per unit of length.

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patent: 4209476 (1980-06-01), Harris
patent: 4577998 (1986-03-01), Dorrn
patent: 4616055 (1986-10-01), Mason

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