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manual abstract
mix – The mixing of paint and air when spraying . Non-Bleeder – In this mode, air flows only when the trigger is pulled This type of operation is used with a compressor equipped with a tank or with a large factory air system Paint Tank – An auxiliary pressurized paint reservoir that allows continuous spraying of large amounts of paint without stopping for refills as with a canister It also allows using the spray gun at any angle without causing paint to drip Pattern Control Knob – Used to form the proper pattern (size and shape) of paint as it is sprayed from the gun to the workpiece Pressure Feed – Method of paint feed where a canister or paint tank is pressurized to force paint to the gun Either internal or external mix air caps are used with this method Pressure feed is generally used for spraying heavy bodied paints or for large size projects Siphon Feed – Method of paint feed where atmospheric pressure creates a partial vacuum to siphon paint to the gun Only external mix air caps are used with this method Siphon feed is used with light bodied paints viscosity – A measurement of the resistance to the flow of liquids CONvENTIONAL vS. HvLP Conventional spray guns use a much higher air cap pressure to atomize paint than HVLP spray guns This results in more overspray and a lower transfer efficiency HVLP, electrostatic and airless processes are currently the only compliant spray methods that meet the strict 65% transfer efficiency criteria required by some air quality management districts This enhanced transfer efficiency results in a significant material savings compared to conventional spraying Check local, state and national regulations that may be in effect before performing any spraying operations HVLP spraying is a growing trend in the finishing industry due to its environmental friendliness By definition, dynamic air pressures in the air cap must be 10 psi or less to qualify as HVLP A soft, low velocity pattern is produced which increases control and reduces bounceback and overspray (See Figure 1) For these reasons, HVLP is also well suited for spraying parts with recessed areas Figure 1 Conventional HVLP Spray Gun Setup The pressure for atomization is controlled at the air source The amount of fluid is adjusted by the fluid control knob, the paint viscosity and the air pressure The gravity feed cup screws onto the top of the gun body creating a positive fluid pressure in the nozzle (See Figure 2) Filtered, Regulated Air Source Figure 2 - Gravity Feed Cup Set-up WATER/OIL IN COmPRESSED AIR All compressor pumps discharge some condensed water, oil or contaminates with the compressed air ImPORTANT: This condensation will cause “fish eyes” to appear in the paint job Install appropriate water/oil removal equipment and controls as necessary for the intended application Locate filter as close to spray gun as possible Failure to install appropriate water / oil removal equipment may result in damage to machinery or workpiece. Operating Instructions Gravity Feed Spray Gun Preparation 1 Thoroughly mix and thin paint in accordance with the paint manufacturer’s instructions Most materials will spray readily if thinned properly 2 Strain material through cheese cloth or a paint strainer 3 Fill the canister about 3/4 full and start the air compressor 4 Set up a piece of cardboard or other scrap material to use as a target and adjust for best spray pattern 5 Test the consistency of the material by making a few strokes on a cardboard target If material still appears too thick, add a small amount of thinner THIN WITH CARE!! Do not exceed paint manufactuer’s thinning recommendations FAN DIRECTION The direction of the fan (horizontal or vertical) can be changed by loosening the lock ring and turning the air cap 90 degrees (See Figure 3) Hand tighten lock ring after adjustment PATTERN ADJUSTmENT 1 Adjust air pressure to the spray gun according to the recommendations Figure 3 Lock Ring Horizontal Fan Vertical Fan Air Cap 40 psi min. 60 psi max. supplied with the spray material This air pressure usually falls between 40 -60 psi Do not exceed spray gun maximum pressure. Adjust air pressure with the trigger pulled and air control knob (if applicable) fully open If reduced air pressure is desired for some areas of the spray job, use the air compressor regulator or air control knob to reduce pressure as necessary (See Figure 4) Figure 4 - Air Adjustment on Spray Gun Decrease Air Flow Air Control Knob Increase Air Flow 2 . Set pattern size to desired shape For full pattern, open pattern control knob by turning counterclockwise For a round pattern, turn pattern control knob clockwise (See Figure 6) Figure 6 - Pattern Size Pattern control knob Fluid Control Knob Fluid Tip (Nozzle) Fluid Packing Nut Figure 5 - Gravity Feed Spray Gun 3 Turn fluid control knob fully clockwise until closed (See Figure 6) 4 Trigger a short burst while turning fluid control knob counterclockwise Observe the spray pattern on the target and...
Other models in this manual:Paint Sprayers - DH5700 (5.69 mb)