A primer is needed to enable adhesion between ink and substrate, in addition to controlling the ink spread during inkjet printing.
There are several factors that affect superior adhesion. Some of these factors are the dyne levels of the ink and substrate, surface energy, coatings, and other bonding factors. Use a dyne pen to test ink adhesion on a substrate. Dyne pens will give you a good idea of ink adhesion on a substrate. Generally, the surface tension of the UV inkjet ink should be 10 dynes less than the surface energy of the substrate. Most UV inks have a range of 25-35 dyne, this is standard for UV inks on the market today. With this in mind, you can expect great ink adhesion and high quality prints on a product that has a surface energy between 35-45 dyne.
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