Photo-Chemical Machining - The Hong Kong Polytechnic University
Photo-Chemical Machining - The Hong Kong Polytechnic University
Photo-Chemical Machining - The Hong Kong Polytechnic University
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<strong>Photo</strong>-<strong>Chemical</strong> <strong>Machining</strong> (PCM)Sheet Metal Pre-treatmentBefore laminated with photo-resist, the metal is thoroughly Electrolyticalkaline cleaned to remove all dirt, rust, greases and oils so that goodadhesion to the photo-resist to obtained. Electrolytic alkaline clean ismore rapid and reliable way for cleaning the surface than soak alkalineclean.<strong>The</strong> processing cycles appear to be:Electrolytic Alkaline cleanWater RinseAcid dipWater RinseDryingFig. 1 Process flow of lamination of photo-resistIII.Lamination<strong>Photo</strong>-resists are UV light-sensitive polymers layer that may be applied toadhere on the sheet metal surface by hot roller lamination.Dry Film Laminating <strong>Machining</strong>Dry film photo-resist forms the middle layer of a three-layer sandwichstructure supplied in rolls of various widths from 75-600 mm and instandard thickness. <strong>The</strong> protective polyethylene layer is peeled off fromthe photo-resist immediately before sticking the photo-resist on to thehot substrate. <strong>The</strong> coating is performed automatically by using alaminator containing a pressurized and heated roller transport system.Both sides of a sheet of metal can be coated simultaneously by using twoseparate rolls of photo-resist.Page 2IC Professional Training
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