Surface tension detection method
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There are three commonly used detection methods.
1. Peel inspection with BOPP single-sided tape
Paste the BOPP single-sided tape on the surface of the film to be tested, press it tightly, and then tear it open. If the surface tension of the film meets the requirements for use, it is very hard to peel off and the sound is small; on the contrary, it is easily peeled off, accompanied by a "sand" sound.
2. Test with Dyne test pen
When the film surface tension value meets the requirements
(BOPP: 3.8×10-2N/m, PET: 5.0×10-2N/m, nylon: 5.2×10-2N/m), the test marks are evenly distributed, no break marks, no shrinkage; otherwise test The liquid will shrink. If a part shrinks and part does not shrink, it means that it is not enough.
It is worth mentioning that when testing PET and nylon, you need to use a large test pen. The common specifications of the surface tension test pen are: 3.8×10-2N/m, 4.0×10-2N/m, 4.2×10-2N/m, 4.4×10-2N/m, 4.8×10-2N/m.
5 kinds (for measuring aluminum foil).
3. Prepare the surface tension test solution by yourself
Part of the surface tension test solution formula is shown in the attached table. The test method is to apply a little test solution of cotton balls to the treated surface, and the judgment method is substantially the same as that of the second point.
The treated film should not be left for too long and can be placed for up to 7 days. The longer the time, the more pronounced the decrease in surface tension value. If it is required to be left for a long period of time, the initial value of the surface tension is increased (2 to 4) × 10 -2 N/m when the film is processed.