Yogurt bag Dain pen

Test method:

1. In industrial practice, the determination of plastic surface tension is carried out by testing ink according to DIN ISO 8296. Ink with known different surface energies is brushed onto a thin film to be tested, and over 90% of the ink edge is observed to shrink and form ink droplets within 2 seconds,
2. in useYogurt bag Dain penWhen testing, an intermediate value should be selected as the starting point, such as 38mN/m. If the test pen wets the surface of the substrate within 2 seconds, the surface tension of the substrate will be greater or just the same as the selected value. Then, a larger test pen needs to be selected for a second test, and so on until the test result shrinks into water droplets (spheres) within 2 seconds. The value from the previous test is considered as the surface energy of the substrate. And use it for comparative analysis.
3. In general, for first-time useYogurt bag Dain penTo ensure the accuracy of the measurement, multiple different types of surface tension testing pens are required for testing; If it is determined that the numerical change in surface tension of the film is minimal, at least 3 different types of surface tension testing pens are required.
4. Surface tension and surface wetting force are very clear standards for accurately determining the adhesion of printing ink and other materials on the surface, but there are other factors that affect viscosity, such as static electricity and many additives. However, these factors are not often displayed during testing, and even when the test results are good but actually do not meet the requirements. This requires discussing these technical issues with raw material suppliers.

5. Measure the surface tension based on the humidity of the test pen. If the selected values are the same, choose a larger value until they are different. If di shrinks into a water ball shape in one go, then a smaller value needs to be used for testing.