Coating film layer moisture adjusting device and planographic printing plate producing method

A coating film layer moisture adjusting device, for adjusting, to a target moisture content, a moisture content of the coating film layer formed by applying a coating solution to an elongated band-shaped support, which support web is continuously conveyed, the device comprising:

• a humidity conditioning zone for having a protective sheet material, which is formed in an elongated sheet-shape and is to be adhered to a surface of the coating film layer formed on the support, pass therethrough;
• humidity conditioning means for adjusting humidity in the humidity conditioning zone;
• adhering means, which is disposed at a downstream side of the humidity conditioning zone and is for continuously adhering the protective sheet material to the surface of the coating film layer;
• moisture content measuring means which is disposed at an upstream side of the adhering means in a conveyance route of the support web and is for measuring a moisture content of the coating film layer;
• and
• humidity conditioning control means for controlling the humidity conditioning means so that the humidity in the humidity conditioning zone becomes a target humidity corresponding to the measured moisture content of the coating film measured by the moisture content measuring means and the target moisture content, and adjusting the moisture content of the protective sheet material, which has passed through the humidity conditioning zone, to an adjusted moisture content corresponding to the measured moisture content and the target moisture content.