Test method:
In industrial practice, the determination of plastic surface energy (surface tension) is through the test according to DIN ISO 8296, ink is known to different membrane of the surface energy of ink in the proposed article about 100 mm long brush on the ink, and observe its more than 90% of the ink edge in 2 seconds whether to contract and form drops, and if so, in a low level of surface energy of ink and brush and ink, the same observation, until no shrinkage and drops, the surface of this test ink can relatively should be the film surface energy.
This method can accurately measure the surface tension and surface moisture of the substrate and determine whether the surface factors of the base material meet the requirements in order to adjust the ink, coating and viscosity to work.
There are 30 to 72 mN/m 21 surface level test inks (each of which is 2mN/m).The test pen (38mN/m) can be used as a quick test tool for the surface energy after corona treatment, but it is not suitable for a system test that has been printed or coated.
When the test pen to draw a line in corona treated surface, if the line is straight into, show that the material surface can not less than 38 mn/m, such as intermittent not connect line, show that the material surface can be less than 38 mn/m, processing insufficient or even not processing, do not conform to the requirements of the printing process.
Surface tension, surface wet strength for accurate determination of printing ink and other materials in the surface of the bonding situation is very clear standard, but there are other factors influencing viscosity, such as electrostatic and various additives.
However, these factors are not often shown in the test, and even the test results are good, but they are not.
This requires discussing these technical issues with the raw material supplier.
Generally speaking, the above situation will not happen to them, and the surface value is 38-41mn /m, which can achieve the viscosity requirement.
The surface tension will cause a lot of white pages (no printing content) under 37mN/m, and the viscosity is not good when 35mN/m is below.
Features: accurate test, convenient, reduce waste, large capacity, liquid storage, long service life.
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