March 23, 2018 | Finn Hinze
Any man-made synthetic material contains long homogeneous molecule chains that form a strong and uniform product. These chains join other long chains, leaving only a few open chain ends, and therefore only a small number of surface bonding points, and this is where the problem of low adhesion and what is known as ‘wettability’ occurs. Wettability is the ratio between the surface energies of the liquid ink and the solid substrate. In general, a material can be wetted if its surface energy, measured in dyne/cm, is greater than the surface energy of the liquid. If it’s the other way around, there will be adhesion problems.