Orange Peel Finishing
June 11, 2009 – 10:13 pmWhen surface result of finishing seen harsh like waving or like surface of peel hence defect called ‘ Orange Peel’ as physically this defect seen. Easiest seen at surface which level off flat because surface with this handicap will not yield good light bound effect ( at melamin type finishing). Peel Orange caused of 3 especial aspects that is temperature & dampness of air, finishing materials viscosities and is thick of coat at the time of douche process.
Viscositas
As liquid size and not measured finishing materials use special measure tube in scale per second the materials emit of stream. If viscosities too low, meaning materials too risk get orange peel although air temperature enough heat. From here what an important is arrange finishing materials viscosities before to use finishing application. Tolerance for best viscosities is 0%. Why? If lower possible we can economize finishing materials but also have defect risk of other finishing, that is air bubble blot. This matter also why mean all finishing professional arrange coat top viscosities (final coat) with lower viscosities.
Temperature and Dampness of Air
One part of the finishing there are materials which is often called of solvent or liquid materials. And in this time the liquid materials there is made from water or thinner (lacquer water based). The Solvent, because volatile in character, will condense also when finishing materials sprayed to object work so that will leave resin or especial materials of finishing at surface of object. Speed of this Evaporation will influence the quality surface of finishing. Peel Orange caused by too quite evaporation and the biggest influencing speed of evaporation is air temperature. Because of that, some big of Furniture Company especially which producing is ‘ flat of furniture’ owning special dryer room to arrange speed of draining as needed. More than that need to be required the dampness of air around object which is drying. Too damp air do not have ‘ room’ to accommodate the evaporation.
Layer
Application Finishing with a few coat have to be taken care of interval time. Second layer only done at the time of first coat enough time to discharging the solvent to air. Also process for to next coat. Materials which have heaped do not have time to disseminate to entire flattened surface due to have been closed over and arrested its movement by next coat, so that can form peel orange.
Besides 3 above mentioned mainly matter, there are some matter which follow to share process forming of peel orange :
1. Air pressure from compressor too low
2. Materials finishing mixing which not yet really flatten
3. Size measure ‘ Nozzle’ at gun spray less precise ( undersize)
Precaution and Repairing
Try to analyze spraying process which usually you do. Ideal distance of spray gun head with object work is between 18 - 23 cm with certain speed. Take care of angle corner lead spray gun always tend to vertical with sprayed surface. Important habit which must always done is trying spray gun at other material object to measure and see result of early so that in the event of defect risk or mistake will not happened at main material object. And vital importance that this trying require to be done each time we change new finishing materials or before adding new materials.
When the peel orange have come at material wood hence the best way is paring surface of finishing till surface of wood look like when before finishing. Emery only some of layer of thick do not be recommended. But there are some finishing type which designing to yield surface like peel. In this case we study melamine finishing requiring result of surface as smooth as glass.
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