Process of producing a foamed resin sheet

摘要: THE PRESENT INVENTION IS DIRECTED TO A PROCESS FOR PRODUCING SHEET OF FOAMED THERMOPLASTIC SYNTHETIC RESIN, WHICH COMPRISES EXTRUDING FOAMABLE RESIN THROUGH SLIT DIE ORIFICE INTO AN EXTENTION ZONE DEFINED BY PAIR OPPOSING CURVED SURFACES MAINTAINED AT TEMPERATURE BELOW EXTRUSION TEMPERATURE, ONE BEING CONVEX SURFACE THAT MOVES IN DIRECTION AND OTHER CONCAVE, SUCH FOAMING OCCURS AS IT EXPANSION CURVATURES RELATIVE SPACEING THEY COMPACT EXPANDING THERE PRODUCED SHEET.