Small holes on solid print (Pinholing)

Pinholing can occur due to a number of causes.
1)Substrate has holes. If this is the case you must change substrate.
2)Ink picking on idler roll. Reduce press speed or increase drying rate on tunnel or in-between dryers.
3)Surface tension of ink too high. Use surface tension modifiers (talk to your ink supplier).
4)Surface tension of substrate is too low. Corona Treat or use primer(talk to your ink supplier).
5)Wrong choice of plate mounting tape (sticky back). Change mounting tape (talk to your mounting tape supplier).