When the dry method is combined, the treatment degree of the PE film with a corona of 38 mN/m is acceptable, but the peeling strength is still poor after the compounding. After the composite film of the composite machine was placed in the curing chamber for half an hour, the interface between the coating rubber layer and the PE film was poorly bonded, and the interface between the rubber layer and the PE film was broken during the peeling, indicating that the rubber layer was poorly wetted by the PE film. The surface tension of the PE film was unacceptable. The normal composite film was placed in the curing chamber for a few minutes and then subjected to a peeling test, that is, the cohesive failure of the adhesive layer occurred. When the peeling was performed, a glue layer was adhered to the PE film, indicating that the glue wetted the surface of the PE film well.
The above phenomenon indicates that there is a problem of accuracy in detecting the surface tension of the film with a corona pen. First of all, it is the correctness of the Corona Dyne index. For example, sometimes the same film is detected with a 38 mN/m corona pen, and the shrinkage phenomenon is detected with a 40 mN/m corona pen. For another example, some 38 mN/m pens can be well wetted on the untreated surface of the OPP film. Second, it is the timeliness of the use of the corona pen.
Ethylene glycol ether is more volatile than formamide in an open environment. That is to say, if the same 'Dyne' pen is used for a long time and repeatedly, since the volatility of ethylene glycol ether is greater than that of formamide, the dyne value of the 'Dyne' pen will gradually increase. In addition, since formamide is hygroscopic, the incorporation of moisture and the formation of formic acid also cause an increase in the actual value of the Dyne pen.
In addition, when repeatedly used, the surface of the film will also cause contamination of the corona pen, resulting in inaccurate test values.
It is convenient to use the corona pen to detect the surface tension of the film, but pay attention to the accuracy of the indication. We can compare the surface tension with the surface tension fluid to judge whether the surface tension index is correct or not. If it is used for the detection of corona surface of PE film, it is recommended to use 40mN/m corona pen to distinguish the degree of corona treatment. For the film with poor corona treatment, the peel strength test of composite sample can be used to judge the glue. The actual wettability of the material.
If a cotton swab is used to disperse the mixed solution, the liquid should be applied at a speed of at least 6 cm2, and the mixed solution should be used in such a manner that it becomes a liquid film without the presence of effusion. The time during which the liquid film formed by the mixed liquid was dispersed from the continuous state to the small droplets was observed. If the liquid film lasted for nearly 2 seconds, the surface tension of the mixed liquid was taken as the surface tension of the sample. Use a new cotton swab every time.
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