Coating method, coater, and method for manufacturing planographic printing plate

A coating method of forming a plurality of layers on a support continuously traveling, comprising:

• a step of applying a first coating liquid onto a front surface of the support to form a lower layer on the support;
• a drying step of removing a solvent in the lower layer until an amount of the residual solvent reaches not more than 100 mg/m2;
• a step of applying a second coating liquid onto the lower layer after drying to form an upper layer;
• and
• a drying step of removing moisture of the upper layer;
• wherein the drying step of removing moisture of the upper layer comprises:
• a first drying step of removing moisture in the upper layer until a moisture content of the upper layer reaches not more than 10% of moisture at the time of application within a range in which a following conditional expression (1) is satisfied:
• (1) temperature (Tw) of the support≦average softening temperature (T0) of the lower layer+10° C.;
• and
• a second drying step of raising the temperature (Tw) of the support to remove remaining moisture of the upper layer,
• wherein in the first drying step, the support is heated on the both the front and rear surfaces of the support until the temperature (Tw) of the support reaches the average softening temperature (T0) of the lower layer−10° C. to (T0)+10° C., and subsequently the support is heated on the front surface of the support while heating on the rear surface of the support is controlled.

A coating method of forming a plurality of layers on a support continuously traveling, comprising:

• a step of applying a first coating liquid onto a front surface of the support to form a lower layer on the support;
• a drying step of removing a solvent in the lower layer until an amount of the residual solvent reaches not more than 100 mg/m2;
• a step of applying a second coating liquid onto the lower layer after drying to form an upper layer;
• and
• a drying step of removing moisture of the upper layer;
• wherein the drying step of removing moisture of the upper layer comprises:
• a first drying step of removing moisture in the upper layer until a moisture content of the upper layer reaches not more than 10% of moisture at the time of application within a range in which a following conditional expression (1) is satisfied:
• (1) temperature (Tw) of the support≦average softening temperature (T0) of the lower layer+10° C.;
• and
• a second drying step of raising the temperature (Tw) of the support to remove remaining moisture of the upper layer,
• wherein in the first drying step, the support is heated on the both the front and rear surfaces of the support until the temperature (Tw) of the support reaches the average softening temperature (T0) of the lower layer−10° C. to (T0)+10° C., and subsequently the support is heated on the front surface of the support while being cooled on the rear surface of the support.