The coating process The liquid emulsion is coated onto a transparent polyester base (film) The liquid emulsion is coated onto a transparent polyester base (film) To aid adhesion the base is pre-coated with a thin subbing layer (substratum) To aid adhesion the base is pre-coated with a thin subbing layer (substratum) Constant thickness emulsion should be maintained Constant thickness emulsion should be maintained Once the liquid emulsion has been applied it is allowed to set firmly Once the liquid emulsion has been applied it is allowed to set firmly Then the thin protective supercoat of pure gelatin is applied Then the thin protective supercoat of pure gelatin is applied Usually for x-ray films the emulsion is coated on both sides of the base Usually for x-ray films the emulsion is coated on both sides of the base Coating is a continuous process and the completed product is wound onto large rolls Coating is a continuous process and the completed product is wound onto large rolls Finally it is cut into different sizes and packed Finally it is cut into different sizes and packed
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