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Painting Defects : Poor Adhesion
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One of a number of phenomena where paint peels from
the surface of the component, poor adhesion is generally identified
during paint-film property testing.
We
recommend our special painting grades for use in painted products.
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Example: Poor adhesion as identified in a cross cut test
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| Cause : |
Although this phenomenon readily occurs when contaminants
such as grease or mold release agent are present on the surface
of the molded component, it is also affected by matching of the
substrate and paint (i.e., solubility and wetting, etc.) and by
the condition of the paint itself (i.e., thinner, viscosity, film
thickness). |
Countermeasures:
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- Degreasing of the molded component's surfaces (using n-hexane,
IPA, etc.)
- Switching to paint with lower cohesive power (cohesive power <
adhesive power a no peeling)
- Thickening of the paint film
- Increasing of the injection speed ( increase orientation and raise
thinner attack ) |
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