How to improve ink formulation? It gets damaged when adhesive is applied on top of it

[MisterResin]

Hi Everyone,

I need to optimize my flexo laminating ink formulation because everytime that I apply the adhesive on top of it you see it redissolves the ink too much. I think it has to do with the Ethylacetate that is present in the adhesive solution.
I understood that adding some PVB in the letdown could work, but my first tests were not succesfull. Any tips?

Thanks in advance.

 

[MisterResin]

My ink contains a total of 12.5 % of solid binder. The solids content of the adhesive is 40%. I've tried to increase the solids of my adhesive solution, but this also didn't help.

 

[D Ink Man]

Please show your generic total ink formula.

 

[MisterResin]

100% INK FORMULATION Amount
Magenta pigment 10
EPU binder 21.4
EtAc 13.2
EtPrOH 10.7
EtOH 44.7
Total (gr) 100

 

[D Ink Man]

First and foremost, no silicone at all in formula.

You need a softer polymer with a lower TG, recommend -15 or -20 to provide improved flexibility.

Consider an acrylic also to improve the situation and adhesion.