The regenerated cellulose film was prepared by zinc chloride/H2O system. The zinc chloride had been washed away in the regeneration process, and the wet film which was not dried had uniform appearance. However, after vacuum drying (using a glass plate to clamp the film), the light transmittance of the film surface is not uniform. Why?（photos has been uploaded）
Is it because the air passage is formed when the water in the film evaporates from the middle of the two layers of glass, or because the pressure is uneven.
thank you for your reply！
Dear Wang Chizhou,
It looks like that your non-uniform films are from the combination of the two factors you mentioned.
Why not use a doctor blade technique to make your films? It could get a better quality of thin films.
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