Inspection point for etching:
1:Check the protective oil whether it was protected in place.
2:Try one sheet to proceed to production:
2.1:Check the etching height by micrometer
2.2:Check the protective oil whether it was damaged after etching
2.3:Check the surface whether it is chromatic aberration
3:Check and prevent the residue after cleaning the protective oil
If all process is OK ,then manage the large production and check it frequently