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Painting Defects : Crawling
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With indentations of 1 mm or more in diameter occurring
on the painted surface, this phenomenon results in the substrate
becoming visible.
We
recommend our special painting grades for use in painted products.
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Example: Urethane paint
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Cause :
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This problem occurs when a contaminant with lower surface tension
(i.e., lower wetting) than the paint adheres to the surface of
the molded component.
- Mold release agent (i.e., silicon oil)
- Machinery grease
- Dust or other contaminants attracted by static electricity
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| Countermeasures: |
- Regulation of the painting environment to eliminate the causative
agents
- Degreasing of the molded component's surfaces (using n-hexane,
IPA, etc.)
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