When printing plastic films, it is important to ensure that the plastic film has sufficient surface tension, which is very important, because it relates to the fastness of the ink to the film surface. The technical staff of surface treatment expert Vetaphone Company gave us a detailed introduction to the surface tension test process.
The packaging industry often uses Dyne test inks to determine whether plastic substrates have sufficient surface tension to meet the requirements of printing, coating, and compounding. In order to prevent the ink from falling off due to poor adhesion, it is recommended to corona the printing material before printing.
Using the felt-tip Dyne test pen is a very simple and relatively economical method that can verify whether the printing material meets the printing requirements. The test method is to simply draw a line on the printing material using a test pen, and determine the surface tension according to the state of the blue ink on the printing material. The surface tension of the film relative to the test ink tension is to determine whether the ink line is stable or broken within 3 seconds after the scribing, such as separation into small ink droplets.
On the surface of the printing material that is treated on part of the surface, test ink can also be used to determine whether the treated area is appropriate. In order to meet the requirements of printing and compounding, the basic requirements for the surface tension of the material are as follows:
General requirements for the dyne level of materials:
Printing: printing with solvent-based ink, 38-42dyne / cm is required;
Printing with water-based ink, 46-48dyne / cm is required;
Coating: Depending on the type of coating, the dyne level is between 44-54dyne / cm;
Compound: solvent-based adhesive 46-48dyne / cm;
Water-based adhesive 54-56dyne / cm.
The most common test range for Dyne pens is 32-56 dyne / cm. In addition, there are bottled test inks, and the brushes themselves are configured to make the entire test very convenient. Another option is the red dyne pen, which can be marked on the material to determine whether the dyne level is higher or lower than 38 dyne.
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