PROCESS FOR PRODUCING RESIN SHEET WITH THICKNESS UNEVENNESS

摘要

A process for producing a resin sheet with thickness unevenness, characterized by comprising: an extrusion step in which a molten resin is extruded from a die into a sheet form; a sheet forming step in which the molten resin sheet extruded is sandwiched between a die roller and a nipping roller to transfer a surface shape of the die roller to the molten resin sheet, and this sheet is cooled and solidified to form a resin sheet; a stripping step in which the resin sheet is stripped from a release roller; a conveyance step in which the resin sheet is drawn and conveyed with take-off rollers while heating the sheet with a heater; a cutting step in which the resin sheet is cut into a given length with a cutter when the resin sheet has a width-direction maximum surface temperature of (Tg-40) ºC to Tg ºC, provided that Tg is the glass transition temperature of the resin; and an annealing step in which the resin sheet cut with the cutter is successively annealed at a temperature of (Tg-40) ºC to Tg ºC.