Porous tubes and hollow profile structures and method of making same
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United States of America Patent
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Jan 8, 1980
Grant Date -
N/A
app pub date -
Jan 17, 1977
filing date -
Jan 27, 1976
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of producing porous tubes and hollow profile structures is characterized by coextruding different materials each through a separate section of a tube-forming extrusion die, one material being pore-forming and producing a porous wall section extending lengthwise of the extruded tube for providing a means of dispersing therethrough a fluid flowing internally of the tube, the other material being non-pore-forming or less pore-forming and producing a non-porous or less porous wall section extending lengthwise of the tube for providing mechanical strength to the tube. Also disclosed are a number of porous tube and hollow profile structures including various arrangements of porous and non-porous wall sections.
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