The present invention is a polarizing plate in the process of producing a flat panel and a polarizing plate is attached A flat panel display to be substantially extinguished by the air bubbles remaining between the substrate Relates to a heating and pressurizing the autoclave to occur at the same time, Relates to a device so that the autoclave can be further improved, especially heating time and the pressure when the safety. According to the present invention, to the product loading portion and the heating and loading a processing jidoe done in an autoclave unit form with a required unloading to unload the product consisting of the processing unit, and the process made the pressure treatment, the apparatus main body upper and lower portions There is a heating means and pressure means in place, heat, was prepared a hot-air (hot Air) supply for the speed-pressure during the time and maintaining a uniform temperature, is provided with a processing device with a structure for increasing the pressure when the safety. Autoclave, heating, pressing, hot air (Hot Air) supply, the flat panel display