These areas with too much powder will suffer from back ionization and from defects like orange peel.
Orange peel powder coating defect pictures.
Good contamination control prevents defects from start to finish.
Page 5 of 35 issue date.
Orange peel is when the surface of a coated product doesn t have an even smooth appearance to it after the coating is applied.
1 4 insufficient adhesion of powder coat to the parts possible causes solution oil water pretreatment and chemical residues check surface of work piece before coating and clean carefully too high film thickness and flowing of coating from the edges of work piece check system parameters reduce film thickness 1 5 orange peel.
Knowing orange peel in powder coating is not ideal it is important to know some of the.
Defined as an uneven texture of smooth finish products that resembles the skin of citrus fruit.
Moisture absorption forms the substrate especially from putties and fillers before painting.
Rejects are the bane of any job shop s existence when applying powder coatings pulling apart out of the oven only to see whorls of orange peel powder sections where the coating has sagged or opacity issues bring a particular kind of dread alongside the question of what happened.
Coating defects fault finding coating defects car straight out of the oven into a cooler room.
In order to ensure that a powder coating operation is producing the highest quality defect free finish however certain steps must be taken to incorporate basic contamination control techniques into the finishing.
Excessive is in the eye of the beholder of course.
One of the most common quality issues with powder coating is an orange peel effect.
The level of orange peel is visually determined by comparing to industry standards typically the powder coating institute pci visual smoothness standards.
Posted by on 11 july 2017.
It is not considered a defect if it is not excessive.
Rejects are the bane of any job shop s existence when applying powder coatings pulling a part out of the oven only to see disappointing orange peel spoiling the powder coated finish sections where the coating has sagged or opacity issues bring a sigh of frustration alongside the question of what happened.
The term orange peel refers to a bumpy coating surface that resembles the surface of an orange.
Back ionization can form when your gun to part distance kvs and microamps aren t monitored closely enough.
One of the most common causes for this is the quality of the powder coating you are applying mainly the particle size distribution as described by shane.
Hi as described orange peel is in fact a surface defect.
It may be barely noticeable or very obvious.
13 05 2014 defects fault finding causes blistering is caused by moisture or contamination under the paint due to.
This is when issues arise in the actual process of applying a powder coating to a substrate the result of which is then a reject.
Whether your powder coating or liquid coating orange peel is usually not desirable because it creates a poor overall finish appearance when your all done coating your product.
Powder coating defects pdf format powder coating.
