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Using two dimensional plane model apparatus of double bubble tubular blown film process which is one of the most important polymer processing to produce biaxially oriented film, the heat transfer characteristics on the plastic film were experimentally studied. In the model apparatus, a polyethylene film was heated by infrared heaters and cooled by plane air jets. The radiation absorptivity of the film was estimated from the measurements of the temperature and irradiation on the film cooled by natural convection without the air jets. The heat transfer coefficient on the film cooled by the air jets was evaluated using the estimated absorptivity of the film.

Heat Transfer from Plastic Film Heated by Thermal Radiant