Accessories for pre-treating
For material surface tension increasing.
For electrostatic charges elimination.
TOSH offers the most common pre-treating devices:
- chemical (use of primer)
Each substrate has got its own surface tension that is measured in Dynes (dyne/cm). Good ink’s adhesion on the material to be printed is obtained when the substrate’s surface energy is equal to or exceeds the ink’s. When using solvent base inks; the most commonly used in pad printing, the minimum surface tension to print an ink is 40 dynes/cm. Certain plastic materials such as PE (polyethylene) and PP (polypropylene), having a surface tension of about 30-32 dynes/cm require pre-treatment prior to printing for surface tension increasing. The pre-treatment modifies chemically and physically the surface, so to increase its wettability.
Another important aspect of pre-treatment is the neutralization of
electrostatic charges., Particular environmental conditions can create electrostatic charges that attract on some plastic materials and on the pads dust and dirt, altering as a result the print quality. TOSH offers different equipments for electrostatic charges elimination.