Fluidised bed process and Electrostatic powder spraying

andrewfei

Electrostatic Powder Spraying:
Advantages
1) Difficult shapes can be coated
2) Film thickness between 30-250
3) Simple and low cost for automation
4) Colour can be changed relatively simply
5) No pre-heating of components required
Disadvantage
1) Cost of equipment is higher than a fluidised bed.
Fluidised Bed Process:
Advantages
1) Very high film thickness (>250μ) can be applied
in one application and curing cycle
2) Uniform film thickness can be achieved
3) Low initial plant cost and maintenance.
Disadvantages
1) Relatively large volumes of powder are required
to charge the plant
2) The work-piece must be pre-heated and in some
cases post cured in order to obtain the required
result
3) This application can only be used where relatively
thick films are required
4) The components should be of simple shape
5) Thin guage material can not be coated by this
method due to its low heat capacity
6) A film thickness of between 200-250 microns is
average
7) Colour change is a massive undertaking.