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WIOPEDIA - The WIOTEC® electroplating encyclopaedia


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O

Orange peel texture

Optical quality defect of a surface, which occurs particularly with paint coatings.

Excerpt from the "Magazine for Surface Technology":
"Paint coatings applied by spraying almost always exhibit a wave-like disturbance of the surface. The wavelength is in the range of 1-10 mm. This disturbance arises during film formation from the superposition of the individual paint droplets, which impinge on the spray base at randomly distributed locations. During the flash-off phase of the coating film, equalizing currents are generated - caused by surface tension forces - which result in a partial leveling of the wavy disturbance profile. However, due to the increase in viscosity caused by solvent evaporation, the flow processes come to a standstill after a certain time.If the coating liquid is sprayed onto a rough substrate, the profile of the substrate is formed on the surface of the applied coating layer. This can lead to an intensification of the orange peel structure. Vertically fanned paint films generally run more poorly than horizontally fanned layers. The start-up flow within the coating film, which is always present in a vertical position, impedes the flow processes and thus the leveling of the orange peel structure."

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Auf den Geeren 9-11
59469 Ense-Höingen, Germany

WIOTEC® Arnsberg GmbH & Co. KG
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59759 Arnsberg, Germany

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