Effect of temperature and humidity on film quality in filming workshop
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The environmental humidity of the filming workshop has an effect on the quality of the film. Mainly because of the change in water content between the adhesive and the plastic film and the print, as the relative humidity of the air changes. Humidity-sensitive prints can cause internal stresses due to dimensional changes.
For example, the longitudinal expansion ratio of the printed matter is 0.5%, and the longitudinal heat shrinkage of the BOPP film is 4%. If the water absorption of the printed matter is too large and the elongation occurs, and the internal stress is caused between the heat shrinkage of the film, the film product may be curled and wrinkled. , the adhesion is not strong. In addition, in a high humidity environment, the equilibrium moisture value of the printed matter will also change, and a large amount of moisture absorbed from the air medium will be released from the surface during the hot pressing compounding process, stagnating at the bonding interface, forming locally. Non-bonding phenomenon. Moreover, the change in the equilibrium moisture value of the printed matter (moisture from the air medium or dehumidification into the air medium) occurs mostly at the edge of the printed matter, so that it forms a ruffled edge or a tight edge, and is not easily formed with the film in the hot press composite. Good adhesion and wrinkles make production impossible.