Polypropylene (PP) films are produced by applying heat to plastic to melt and extend it.
Sometimes, foreign particles mixed in raw materials and non-fused matter cause defects called “fish eyes.”
In many cases, however, these defects are difficult to see clearly due to their poor contrast.
Visualization with fluorescence
Using the All-in-One Fluorescence Microscope BZ-X800
Even in cases where defective parts are difficult to detect through normal observation, fluorescent observation makes such parts shine, thereby facilitating their detection.
Fluorescence observation can be performed easily because no darkroom is necessary.
If each fish eye responds to different fluorescent wavelengths, the results can also be applied to identify the causes of the defects.