Morning Simon,
We do not have Labour Day or Bank Holiday here in the Netherlands.
We are recuperating from Queens day and preparing for Asencion Day, we close for two days than.
Set-off in shrink films occurs more easily?
Demanding applications were you cook in the bag or sterilize the packed product need inks that can withstand high temperatures, rubbing etc.
These type of inks need to cure for some time after printing. The printed film is winded with some tension and this causes pressure build up between the layers.
Non-shrink films behave like paper, the tension in the roll is winding tension and very little tension caused by shrink, the pressure does not increase much in storage.
Shrink film on the other hand behaves like rubber bands, during production we pull them out as far as possible and than “freeze” them.
With shrink-film you have the tension from winding but also the tension that is in “frozen” state.
However it is not completely “frozen” and it releases some of its shrink force during storage.
That is the reason why pressures can build up too high levels.
The not fully cured ink that is still a little flexible sets-off under the high pressure to the other side of the film or tube.
Remember to share good fortune with your friends, Okido