Three critical factors affect ink adhesion beyond ink selection itself: ink mixing, product cleanliness, and substrate additives.
Ink mixing
Inks require precise manufacturer-specified ratios. Deviating from these specifications — including exceeding hardener amounts — risks adhesion failure.
Surface contamination
Handler oils and residues from secondary processes compromise adhesion. We recommend alcohol wiping as a standard decontamination method that evaporates cleanly without leaving residue.
Blooming
Blooming occurs when plasticizers or additives migrate to a part’s surface over time. While initial wiping removes contaminants, blooming is a term used in the plastic industry that denotes a plasticizer or other additive coming to the surface of a part over time, causing recurring adhesion issues.
Mold-release agents
Mold-release agents simplify plastic production but significantly impede ink bonding to substrates.
Practical experience remains essential for achieving reliable adhesion. Contact our technical-support team for specific challenges.