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What’s the difference between viscosity and thickness in plastisol application
What’s the difference between viscosity and thickness in plastisol application?
1. Viscous Plastisol inks possess high viscosity but low fluidity, good synechia and internal friction of molecular( also named cohesion ),
excellent cure. Create clear, plump and shining dots. Possess super wash property. Produce low likelihood of emulsification.
Easy to retract and dry, bright and saturated in color. Stack thickly. Apply to these situations:
1) Print on solid coated papers, cast coated papers and white cardboard featuring great gloss and surface strength.
Gold and silver cardboard also with great gloss and non absorption.
2) Suprerior-scree- lines printings. Because viscous inks make it easy to create solid, clear and abundent colors.
3) When to use gold or silver or fluorescent ink, mix it to improve viscousity for adhesion and cleanliness increases.
4) Necessary viscosity increase for pearl ink.
Viscosity has becomes a factor in screen spot transfer. Appropriate adjustment of viscosity size dep ends on
changes of different conditions and printing technologies, actually on cohesion. Detailed steps for viscosity
increase as follows:
1) Add a right amount of tackifier.
2) Add some highly viscous resineon.
3) Add enough high-viscosity ink.
Strong cohesion and adhesion will not allow highly-viscous inks to be applied in some case. For example,when to print on offset paper or white board which
possesses low paper strength, fast printing and high ambient temperature are necessary.