METHOD FOR PRODUCING COMPOSITE SHEET HAVING POLYOLEFIN FOAM LAYER PROVIDING GOOD EXTERNAL APPEARANCE, ADAPTABLE FLEXIBILITY AND SATISFACTORY INSECT RESISTANCE WITHOUT SURFACE DEFORMATION

摘要

PURPOSE: A method for producing a composite sheet having a polyolefin foam layer is provided to enable the composite sheet to provide a good external appearance, adaptable flexibility and satisfactory insect resistance while exhibiting no surface deformation during use. CONSTITUTION: The method for producing a composite sheet having a polyolefin foam layer and a polyolefin surface layer comprises: preparing a first molten blend(G) containing a first polyolefin resin(E) and a physical blowing agent(F); preparing a second molten blend(D) containing a second polyolefin resin(A), a polymeric anti-static agent(B) and a volatile plasticizer(C); co-extruding the first and second molten blends(G,D) stored in first and second extruders(12,11), respectively, to a low-pressure area through a die(13) connected to a composite feeding block(14) to form an integral composite.