Roll coating apparatus for forming a film of a high viscosity coating liquid on a surface

A roll coating apparatus for applying a coating liquid of a high viscosity of more than 1000 cp to the surface of a plate substrate being fed to the apparatus, said apparatus comprising:

• means for feeding said substrate to said roll coating apparatus;
• a rotatable coating roll extending in a first direction intersecting a direction of feeding of the substrate and effective for pressing against the substrate;
• doctor means extending parallel to an axis of said coating roll and defining a space between said coating roll and said doctor means for storing said coating liquid in a manner allowing said coating liquid to adhere to a surface of said coating roll upon rotation of said coating roll;
• temperature maintaining means for maintaining the temperature of the coating liquid adhering to the substrate above a predetermined value;
• coating liquid supply means for supplying the coating liquid to said space;
• and
• said coating roll having a circumferential surface and a plurality of axially spaced and circumferentially extending grooves on said surface, said grooves having a pitch of at lest 300 .mu.m and an axial spacing between grooves which is not greater than 80 .mu.m.

A roll coating apparatus for applying a coating liquid of high viscosity at a normal temperature to the surface of a plate substrate being fed thereto, comprising:

• means for feeding said substrate to said roll coating apparatus;
• a rotatable coating roll extending in a direction intersecting with a direction of feeding said substrate and effective for pressing against said substrate;
• doctor means extending parallel to an axis of said coating roll and being disposed adjacent said coating roll in a manner defining a space between a said coating roll and said doctor means for storing said coating liquid thereat, in a manner allowing said coating liquid to adhere to a surface of said coating roll upon rotation thereof;
• means for heating said substrate, said heating means including means located over said substrate feeding means and effective for blowing heated air on said substrate;
• and
• said coating roll having a circumferential surface and a plurality of axially spaced and circumferentially extending grooves on said surface, said grooves having a pitch of at least 300 .mu.m and an axial spacing between grooves which is not greater than 80 .mu.m.