Tool surfaces of machines or equipment used for processing materials, especially polymers, have a microstructure reducing actual contact area between polymer and surface

摘要

Areas of the tool surface in contact with the processed material have a microstructure formed of microscopic recesses and raised areas. The structure gives an actual contact area of 10-90% of the entire area covered by the material. An Independent claim is made for a use of the tool surface on extruder nozzles, screws and barrels, on dies, calibrators, calender rolls and injection molding tools.