Precision glue application to avoid glue waste and curl board. Optimized paper board quality and glue consumption. Pneumatic operated rider roll load / lift. Gap of glue roll and doctor roll motorized adjustment with digital display for uniform glue application. Glue roll and doctor roll with precision ground, hard chrome plating and anilox of 20~30 mesh. Glue roll auto idling drive when machine stops. Preheating drum equipped with steam rotary joint and siphon.