What can screen printers print with UV technology
Although it is not possible to UV print every job, 90% of those normally printed with solvent inks can now be printed with UV inks.
The following questionnaire provides a few of the answers why:
Q. Is it possible to print opaque inks?
A. Yes. Previously, printing opaque UV inks was very difficult. Because of new developments in the UV formulations, we can print whites, blacks and metallics that compare favorably with solvent inks.
Q. Can UV inks be used for vacuum forming?
A. New developments are beginning to make this possible. This was not so in the past as UV inks are not thermoplastic and are normally of a brittle nature. The ink would crack if there are deep depressions in vacuum forming.
Q. Can plastic bottles be printed UV?
A. Yes, if the bottles are made of normal bottle type plastics (i.e. polyethylene, polystyrene, polypropylene or PVC etc.)
Q. Is UV ink adhesion good on all substrates?
A. Yes, if the surface tension of the substrate is above 38 dynes minimum. However, with surface tensions under 38 dynes, adhesion would be questionable. Therefore, corona or flame treating may be required.
Q. Are UV inks and conventional inks compatible?
A. In theory, they do not like each other; however, there is no reason why you could not combine the two systems to obtain a desired effect. Tests would have to be done to check adhesion between the two inks. When in doubt, consult your ink supplier.
Q. Can UV inks be used on all types of screen printing presses?
A. There are no problems in using UV ink on all types of screen printing presses. However, UV printing requires finer, even deposits of ink lay down. As such, finer meshes and the purchase of a UV dryer are required.
Q. How does UV differ from conventional drying?
A. UV drying is UV curing. As UV inks are 100% solids, there are no solvents present. Therefore, everything will polymerize. When UV inks are exposed to ultraviolet light, a reaction takes place which causes the total ink film to become a solid mass.
Q. Can UV be printed onto most substrates?
A. Yes. With the evolution of inks and dryers, UV printing on the most difficult substrates, such as metal, aluminum, polyethylene, mylar, foil, polystyrene, polypropylene, A.B.S., PVC, ceramic and glass, offers excellent printability.
Q. And finally is UV ink economical compare to solvent?
A. YES, YES & YES as I said earlier that UV ink even if bought at Rs. 1200/- per kg is 60% to 70% cheaper if compare to dirt cheap solvent ink of 350/- per kg plus there are many other advantages which you calculate it can even work more than 100% cheaper compare to solvent ink.
If you get a suitable UV ink for your job then immediately FORGET solvent and go for UV and make huge profits.
Have a great day…