An undesired adhesion between touching layers of material caused by moderate pressure and/or temperature change. The extent to which damage to at least one surface is visible upon their separation.


– Ink not drying on substrate;

– Ink skinned – Trapping solvent;

– Web rewound too warm;

– Excessive rewind pressure;

– Film treated on both sides, especially if treatment is different between each side;

– Plasticisers in film subjects to migration e.g. some vinyl films;

– Surface moisture on web;

– Excessive weight in stack;

– Pre-applied coating softens.


– Adjust solvent balance, use faster solvents. Check dryers;

– Use less heat initially. Reduce viscosity which reduces film thickness. Check dryers;

– Reduce web temperature by chilling to within 5°C of ambient. Instant chill rollers or reduce dryer temperature;

– Reduce web tension;

– Avoid excess pressure on re-reeling, use a non blocking varnish over inks. Best solution is to ensure film specification is correct at start;

– Avoid excess pressure, use non blocking overprint varnish. Use inks with non migratory pigments;

– Avoid over chilling especially in humid conditions where moisture condenses on cooled web;

– Reduce stack height;

– Change to solvents that do not attack prior coatings.

latest news