MANUFACTURE OF POLYESTER WEB WITH HIGH ADHESION WITH COATING LAYER AND DEVICE FOR MANUFACTURING POLYESTER WEB

摘要

PROBLEM TO BE SOLVED: To improve the adhesion of a photographic layer without the use of an undercoat by treating the surface of a web through a glow discharge under an atmospheric pressure between a step for heat-setting and a step for heat orientation and applying a substrate containing gelatin to the surface of the treated web. SOLUTION: After stretching and heat-setting a web, it is treated through a glow discharge using helium and a mixture of helium and another gas. This treatment is performed by causing the web to pass through a device 22 equipped with a grounded roller electrode and a conformable shoe-like electrode arranged a little distant from a roller. After that, a substrate, preferably an agent containing gelatin is coated to the bare surface of a treated polyester at a coating station 20. After the coating layer is dried, the coated web is thermally orientated by a heat orientation part 44. The heat orientation part 44 normally includes an insulating chamber with a meandering passageway through which a hot blast or radiation passes.