EXTRUDED STRUCTURE

摘要

"EXTRUDED STRUCTURE" A method of producing a porous structure in which a blend of a first thermoplastic polymer and a second, immiscible, thermoplastic polymer is extruded through a die into a structure having the desired cross section in which the polymers are present in the structure as interpenetrating networks and leaching out with a solvent for the immiscible polymer that network formed by the immiscible polymer so producing a porous structure comprising the first polymer network characterised in that a perforate barrier plate is interposed in the flow path of the blend prior to its passage out of the die.