METHOD FOR PRODUCING TRANSPARENT POLYPROPYLENE SHEET AND TRANSPARENT POLYPROPYLENE SHEET

摘要

An apparatus (1) for producing a transparent polypropylene sheet, which comprises a sheet formation means (11) for melt-kneading a resin composition comprising (A) 60 to 97 mass % of a polypropylene resin having an isostatic pentad proportion of 0.85 to 0.99 and a melt index of 3 to 10 g/ 10 min and (B) 40 to 3 mass % of a polypropylene resin having a racemic pentad proportion Ärrrr/(1-mmmm)Ü of 0.15 to 0.50 and a melt index of 2 to 10 g/10 min and extruding it into a sheet, a first cooling means (12) for cooling a sheet (20) into a solid, a preheating means (13) for re-heating the cooled sheet (20), a heat treatment means (14) for heat-treating the sheet (20) into a sheet (21) and a second cooling means (15) for cooling the sheet (21) after heat treatment.