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FFPs Frequently Faced Problems

In powder coating areas, high humidity causes improper particle deposition, irregular film thickness, operationalproblems in spray guns, caking or agglomeration (clustering) of the powder particles and has a measurablenegative effect on powder resistivity. In severe cases, powders exposed to high humidity, cannot deposit at all.

General Recommendations

Relative Humidity in owder !oating "reas should be maintain #$%&' RH at#%&!

Our Solutions

Powder Coating have opened a new horizon in the product inishingindustry all over the world providing the user improvements in coating*uality, efficiency and economy. owder coating permits the paining ofob+ects by spraying a dry product with no solvent, thereby avoiding pollution

of the water or the atmosphere. rom an economical standpoint, oversprayor excess powder can be reclaimed through a recovery system and reused.

!he Process-fficiency and reliability of owder !oating is mainly a function of the compulsory control of the interactionsbetween the product to be applied i.e. its chemical composition and the various elements e.g. charge decay of thee*uipment operating under the surrounding conditions of the application. Relative Humidity and temperaturedirectly affect the practical application achieved. However, in most powder coating spraying facilities, thesesurrounding conditions are not controlled"

#ects o $umidityHumidity has a direct relationship with ion charge decay, particle deposition, regularity of deposited thickness,ad+ustments re*uired of the operating conditions of the spray guns, caking or agglomeration (clustering) of thepowder particles and have a measurable negative effect on powder resistivity. High humidity may cause the powderparticles to stick to the corona electrode and thus *uench the corona. In severe cases, powders have beenexposed to high humidity, cannot deposit at all.

Solution

tili/ation of 0ry1"ir 2ehumidifiers and environmental systems accomplishes complete control over both relativehumidity and temperature within the powder spray booth area and often the entire coating room.!he advantages stem rom two basic points%

3. 4ower humidity will provide the ideal environment for the powder particles to sustain their charge prior toimpact with the target.

. 5ince most powders are hygroscopic to varying degrees, high humidity will cause agglomerates to form onthe walls of the recovery duct, filters and tubing. 6he filter bay house becomes less efficient re*uiringfre*uent attention.

!he &dvantages

'pto ()* less powder is required 1 due to uniform control of film thickness and reduced losses frompowder coating build1up and agglomerates.

+ncreased control over ilm thic,ness1 by controlling the electrostatic field more precisely, the ability tocoat the target more uniformly is achieved (particle deposition coupled with long term ion decay)

+ncreased system luidising7 the recovery system works nearer its peak performance level due toreduced powder build1up in the duct, filter and tubing.

Reduced &gglomeration7 dehumidified air reduces the powder8s ability to adhere to the inside surfaces.

Reduced spray gun build%up7 a noticeable, marked improvement in *uality

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