Extruded materials having capillary channels

摘要

The present invention’ provides extrusion-processable materials having a plurality of capillary channels therethrough, and apparatus and methods for manufacturing such materials. The capillaries may be occupied by gases, liquids or other phases. The materials may be anisotropic foams which have high voidage. The methods and apparatus include quench cooling (11) of an extrudate (2) as it exits a die (14).