When installing new plates in your facility, it’s critical to look beyond typical considerations which include calibrating the new plate to the platesetter and creating new plate curves for press. The new plates also have to be compatible with your pressroom’s chemistry––this includes everything and anything that might come into contact with the plate’s surface. By performing a drip test, you can remove any chemicals that may attack the plate’s surface and cause problems on press. To perform a drip test, follow these steps:
- Image a large 75% screen tint block onto your new plate.
- Drip all chemicals onto the screen tint that may come into contact with the plate’s surface (either directly or indirectly). You can mark what was dripped onto the plate by scratching the name of the chemical into the plate’s surface.
- Allow the chemicals to sit on the plate surface for at least one hour.
- Check for any chemistry that attacks the emulsion of the plate and remove those chemicals from your pressroom.