Solvent and ecosolvent inks allow you
to print onto various types of uncoated films, including RTape's VinylEfx® vinyl
print media. As wonderful and easy to use as
these print systems are, you must test and evaluate the inks and your printer
settings prior to production. Incompatibility between the ink system and the print media could be problematic.
Typical problems encountered, when
printing on many different types of films, involve poor ink
adhesion, shrinkage, vinyl curling, color shift and/or dot gain. To reduce the
likelihood of problems, follow these few simple rules:
When you are printing with solvent or
ecosolvent inks on films, such as VinylEfx®, you must carefully control ink density. Heavy ink concentration,
which occurs when you print a solid color or drop shadows, contributes to shrinking
and curling. When printing on ChalkTalk®, a modified styrene, too heavy of an ink deposit can
embrittle the film, frequently resulting in cracking. This fact alone should raise concern when attempting to print on this film with solvent or ecosolvent inks.
To minimize curling and other adverse effects when printing on films, such as VinylEfx®, adjust your ink limit to less
than 250%. In addition, never print to the edge of the media. Instead, provide
a 1/4-in. ( 6mm), outline around the printed image.
Heavy ink
concentrations can cause other problems.
They can take forever to dry. The ink can also bleed or puddle into ink
islands.
To minimize
bleeding, slow your printing speed. The slower speed also reduces the
likelihood of vinyl contraction, because the ink has extra time to start drying before another ink layer
is printed. The downside is, of course, less printing efficiency.
When printing
higher resolutions, in addition to adjusting the density curve in your profile to
control the amount of ink that you print, reduce your print speed. You'll
experience less bleeding, especially when printing onto glossy films. You also give the ink more time to dry before the printheads make
another pass. Generally, you get better results with matte-finish films, as
opposed to glossy ones.
Printing on RTape’s ChalkTalk® with solvent and ecosolvent inks is not advisable for another reason other than the potential for cracking. These inks are transparent. The slate
grey of the ChalkTalk film will show through. My suggestion is, if you have the
option of printing with a UV inkjet system, that’s your best choice, especially
if you have white ink.
UV inks are 100% solids. What that means is
100% of what is deposited on the substrate is cured. What’s more, UV inks are
opaque. The ideal way to print on the ChalkTalk® or other films that are patterned or of a dark hue is to first print white to
completely block out the background. Then print the other colors. UV inks also
allow you to print to the edge without the fear of edge curl.
Conclusion. To minimize problems, test
and evaluate your media choice with your printer and inks, prior to production.
By operating your equipment in a suitable
environment, based on the printer manufacturer’s recommendations, and use the
proper print settings you should achieve acceptable results.
About Jim Hingst: After fourteen years as Business Development Manager at RTape, Jim Hingst retired. He was involved in many facets of the company’s business, including marketing, sales, product development and technical service.
© 2015 Jim Hingst
About Jim Hingst: After fourteen years as Business Development Manager at RTape, Jim Hingst retired. He was involved in many facets of the company’s business, including marketing, sales, product development and technical service.
Hingst began his career 42 years ago in the graphic arts field creating and producing advertising and promotional materials for a large test equipment manufacturer. Working for offset printers, large format screen printers, vinyl film manufacturers, and application tape companies, his experience included estimating, production planning, purchasing and production art, as well as sales and marketing. In his capacity as a salesman, Hingst was recognized with numerous sales achievement awards.
Drawing on his experience in production and as graphics installation subcontractor, Hingst provided the industry with practical advice, publishing more than 150 articles for publications, such as Signs Canada, SignCraft, Signs of the Times, Screen Printing, Sign and Digital Graphics and Sign Builder Illustrated. He also posted more than 325 stories on his blog (hingstssignpost.blogspot.com). In 2007 Hingst’s book, Vinyl Sign Techniques, was published.
© 2015 Jim Hingst
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