Method for producing different kinds of heat-treated products

A method of producing different kinds of heated products using a facility comprising a heating device for heat treating works while feeding said works facility from entrance to facility outlet, a plurality of pre-treatment and post-treatment devices provided, respectively, upstream and downstream of said heating device, a case carrier device having a main carrier line extending along said heating device and said pre-treatment and post-treatment devices, a first transfer device provided between said carrier device and the entrance of said heating device, and a second transfer device provided between said carrier device and the outlet of said heating device.

• said method comprising the steps of putting a plurality of kinds of works fed from said pre-treatment device in a plurality of heat-resistant trays with one tray carrying the same kind of works, setting said heat-resistant trays in carrier cases each having a marking for showing the kind of works carried by the respective tray, moving each carrier case by said carrier device to a point near said heating device, separating each heat-resistant tray from the respective carrier case by means of said first transfer device, feeding each tray into said heating device while moving said tray-free carrier cases toward said second transfer device by said carrier device, putting each heat-resistant tray coming out of said heating device back into said carrier case by said second transfer device, moving said carrier cases now carrying the trays further ahead by said carrier device, sorting said cases according to the markings on said cases, and feeding said cases thus sorted to said post-treatment device.