Many customers said that CPP cannot use with PU base ink for BOPP printing,can it really not be used in PU ink?
PU based formulations are very unstable sometimes because of pigments selection,consider stability.When we add CPP to get quick tape test, stability becomes inferior.,So may possible is OK whit some colors pigment,some colors with unstable.
If you can try in lab first,We recommend the following testing methods for testing in the laboratory: as small qty like 1 or 2% CPP in PU base ink and after adding to be reconfirm ink stability because of pigment,If your pigment is compatible with CPP in PU base ink, you can use it.
Summarizing the above: whether CPP can be used in PU base ink, it depends on whether the customer’s pigment is compatible with CPP