| Characteristics |
One of a number of phenomena where paint peels from the surface of the component, poor adhesion is generally identified during adhesion testing.
(picture:Poor adhesion as identified in a cross cut test) |
| 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 |
- 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 )
|
