| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of manufacturing a resin foamed sheet suppressing variation in thickness of the resin foamed sheet upon forming the resin foamed sheet using a circular die and to provide a reflection sheet comprising the resin foamed sheet manufactured by the manufacturing method.SOLUTION: In the method of manufacturing the resin foamed sheet, the resin foamed sheet is manufactured by extruding a heat-molten foaming resin composition from the circular die and forming a cylindrical body having a foamed layer, increasing the diameter of the cylindrical body by slidingly contacting the outer peripheral face of a mandrel disposed in front in the extruding direction of the cylindrical body from the inner side, and forming the cylindrical body increased in diameter into a sheet shape. The temperature in an inner space of the cylindrical body between the circular die and the mandrel is maintained at 60-110°C. |
