Behaviors of Bubbles Trapped in Film Coating during Spray Gun Coating and Its Influences on Coating Defects
Ryo Noguchi,
Ayako Yano,
Kenji Amagai
Abstract:In this paper, we investigated the behaviors of bubbles entrained in a film coating during spray coating. Air bubbles that remain in a film coating after diluent evaporation cause coating defects called bubbling defects, including fish-eye and crater defects. In this study, the visualization of a film coating revealed that smaller bubbles in the film shrank slowly and disappeared, while larger bubbles remained. These remaining bubbles grew during the heating process for the drying of the film coating. The shri… Show more
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