How to solve the delamination of the film part?

Reason one: poor tension control causes shrinkage of the film after compounding, while other films relax and cause tunneling reaction;

Solution: Master the tension that is most suitable for each film structure (the tunneling reaction is easy to occur when the adhesive film or the composite film that is not easy to stretch is coated on the stretchable film);

Reason 2: The film is wrinkled, the thickness of the slack is uneven, and the shape of the wrinkles is poor;

Solution: Check the shape of the film, do not use the film with poor shape, adjust the guide roller before the bonding roller, pay attention to the deformation caused by moisture absorption of the film;

Reason three: the film is processed incorrectly, the treatment is insufficient, and the treatment is spotted;

Solution: When compounding, use the actual detection to process the surface;

Reason four: improper winding operation;

Solution: Pay attention to the change of the winding pressure. The winding pressure is adjusted according to the film structure, that is, the pressure is lower when winding the stretchable film, and the pressure is higher when the hard composite film is wound. After the composite film is cooled, it is wound up. Prevent shrinkage of the film;

Reason 5: The relative molecular weight of the binder is small, and the cohesive force is also small. Since the shrinkage of the film is not easily prevented, a tunnel reaction occurs;

Solution: use a binder with high relative molecular weight, high cohesion and fast curing;

Reason 6: The adhesive is slow to cure due to incorrect bonding of the adhesive, mixing of water or alcohol, low storage temperature of the composite film, and the like;

Solution: fully carry out the thermal insulation curing process of the composite film or select the curing adhesive faster;

Reason 7: The adhesive layer is easy to move due to excessive coating amount of the adhesive;

Solution: less adhesive coating;

Reason 8: Since the drying temperature (drying temperature) is too high, the film stretching and contraction is large, and the reaction in the binder is too fast, it is difficult to obtain a sufficient initial tack.

Solution: Check the drying conditions and set the most suitable drying conditions. When drying the film that is more easily stretched after heating, lower the drying temperature and increase the air volume.