RESIN SHEET HEATING APPARATUS AND RESIN SHEET HEATING METHOD

PROBLEM TO BE SOLVED: To provide a resin sheet heating apparatus or the like capable of performing a heating treatment of a resin sheet with reduced energy.SOLUTION: In the resin sheet heating apparatus 1, a resin sheet 20 is heated by a heater 31 while being transported in a heating furnace 30. After the resin sheet 20 is discharged from the heating furnace 30, a sheet ear 21 part having a width Win the end part in the width direction of the resin sheet 20 is cut off in a sheet cutting section 40. The sheet ear 21 cut off from the resin sheet 20 is cooled in a cooling section 50, and then the width W of the sheet ear 21 is measured in a measuring section 60, and the shrinkage factor α is calculated. A controller 10 compares the obtained shrinkage factor α with a specified value αand controls the heating amount by the heating furnace 30 by performing output control of the heater 31 based on the comparison result.