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Q What is the voltage range of electrostatic powder coating?
A Normally, 60-80 kV. Within a certain range, the powder coverage increases as the high voltage increases, but when it reach to 90kv, the powder coverage decreases. The optimal range for re-coating is 40-50kv
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Q What types of powder coating pretreatment do I choose?
A There are mainly 3 kinds of pretreatments in the market.
1. Sandblasting, common and economical, suitable for small and medium parts, such as car wheels, bike parts.
2. Spraying Washing, Threre are several spraying tunnels that wash the workparts step by step, usually used on automatic powder coating line which requires high efficiency and costs big budget.
2. Dipping. Used for large and complex workparts, there are several tanks dipping workparts step by step, applied in manual or semi-automatic powder coating plant, lower efficiency but requires less budget than spraying washing.
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Q Why powder coating requires pretreatment process?
A To smooth the object surface, strip chemisorption layers, enhance adhesion properties thus obtain quality powder coating finish, processes Inlcuding rust-removing, paint-removing, degreasing and oil-removing, etc
