Porous tubes and hollow profile structures and method of making same

摘要

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.