... roll stand,preheater,single facer ,transport conveyer, gluing machine ,double facer, CORRUGATED BOARD PRODUCTION LINEThe corrugated cardboard ... stand,preheater,single facer ,transport conveyer, gluing machine ,double facer machine ,slitter scorer ,stacker and heating system ,air ... 4. The teeth of the corrugated roller are middle frequency induction hardening. The top corrugated roller is drum type, ...