Aeration pipe and method of making same

Year	Description
1996	Invention patented by William S. Mitchell on September 26th, 1996. Abstract: This invention relates to the manufacture of flexible porous plastic aeration pipe having an essentially uniform porosity throughout its length. The plastic pipe of this invention has a gas permeable wall of thermoset polymer particles and thermoplastic binder for the particles with a substantially uniform plurality of micropores through the wall of about 0.001 inch to 0.004 inch along its length for diffusion of gas therethrough and transfer to a medium. The thermoset polymer particles have a mesh size of about 60 to about 140 mesh, preferably approximately 80 to 100 mesh. The method of manufacture includes volumetric delivery of thermoset polymer particles and thermoplastic binder particles to a mixing chamber for preblending and then controlled volumetric feeding of the preblend into an extruder to form the porous aeration pipe.
Source: selected by the editor from original sources.

Invention: Aeration pipe and method of making same