Heating device and heating method

A heating method of heating a laminate which includes a plurality of composite materials that include reinforcing fibers and thermoplastic resin by using a heating device including a heating unit having a first contact surface and a cooling unit having a second contact surface which is disposed to surround the first contact surface, the heating method comprising:

• a heating step of heating, through the first contact surface that is in contact with the laminate, the thermoplastic resin included in the laminate that comes into contact with the first contact surface to a temperature equal to or higher than a softening temperature;
• a cooling step of cooling, through the second contact surface that is in contact with the laminate, the thermoplastic resin included in the laminate located outside the second contact surface to a temperature lower than the softening temperature;
• a pressurizing step of applying a predetermined pressurizing force to the laminate through the first contact surface and the second contact surface, and
• a moving step of moving the heating device relative to the laminate from a first position on the laminate to a second position on the laminate while maintaining a state where the first contact surface and the second contact surface are in contact with the laminate,
• wherein when the heating step is executed, the cooling step and the pressurizing step are executed at the same time, and
• the second contact surface is disposed to surround the first contact surface;
• and a step of cooling the thermoplastic resin included in the laminate that comes into contact with the first contact surface to a temperature lower than the softening temperature by stopping the heating through the first contact surface by the heating step while maintaining the application of the pressurizing force by the pressurizing step before the heating device is moved from the first position to the second position in the moving step.