Screen E-Book (.PDF) - MacDermid Autotype

StaticPresence of static will cause more dust tobe attracted to surfaces. Static is producedin 3 ways.1. Separation2. Friction3. InductionThe simple act of removing a sheet of filmfrom a stack produces static by separationand friction.Antistatic wipes, static eliminator bars andantistatic air knives can be used to reducethe problem.use. Card and paper should be kept awayfrom the printing area if possible.5. Raise humidity, care should be taken ifdamping down the floor to avoid slip hazards.6. Wear clean room overalls.7. Filter air conditioning. Care should betaken if turning off air conditioning that thenew source of air is not more dust laden.Light spotsDescriptionLight spots in the print caused by gain inthe stencil.Basic clean up measuresContamination is present on surfaces andin the air. Clean up measures can be employedto minimise dust.1. Clean all surfaces and floor.Use a damp cloth or vacuum with a HEPAfiltered exhaust.2. Close doors and use tack mats to minimisedust and dirt entering the screenprinting area. Also minimise the numberof people moving around in the area.People are the biggest source of dust. Ifadding additional enclosure take care thatair movement into the area is from a cleansource. For instance shutting the door willbe a waste of time if the air is then going tobe pulled from filthy air space above ceilingtiles.3. Use lint free wipes.4. Avoid fibrous packaging, sheets shouldbe removed from the transit box prior toCauseUndercutting caused by a dust particlebetween the stencil and positive duringexposure.129