In the solvent-free compound process, tension control is extremely important and must be very precise. Tension control includes main unwinding tension, film tension after coating, auxiliary unwinding tension, winding tension, and winding taper.
Essentials of Solvent-free Compound Tension Control
1. Generally speaking, the unwinding tension is based on the auxiliary unwinding tension, and the main unwinding tension is increased to match the auxiliary unwinding tension to make the composite film finally reach a flat state. Under this premise, the unwinding tension is The minimum tension without longitudinal and horizontal folds.
2. The tension after the film is coated is slightly larger than the unwinding tension, which is used to pull the film after the coating, so that the corresponding coating steel roller does not require a large driving current.
3. The winding tension is slightly greater than the unwinding tension. The winding tension needs to withstand the initial viscosity of the composite film is generally only about 0.2N / 15mm, and the winding taper is controlled within 20%. As the diameter of the winding increases, the tension decreases. The degree is slower than dry compound.
4. For the films of different materials, the tension of each part in the compounding process is also different. Even the film of the same material has a very different tension according to the different structure of the compound. Such as PET / PE structure, because PE is easy to stretch, its tension is roughly 3 ~ 5N, and PET has to compete with the shrinkage stress of PE, its tension should be relatively large, roughly 20N; the same is PET film, in PET / paper In the composite structure, because the stretchability of the paper is relatively good, PET only requires a minimum tension, generally about 5N.
Check if the tension is appropriate
Stop during the lamination process, and use a blade to draw a cross on the composite film at the rewinding position. The most ideal state is that the composite film remains flat after the scoring. If the composite film is curled in a certain direction, it means that the tension of this layer of film is too large, and the tension of this layer of film should be appropriately reduced or the tension of another film should be increased.
Check if the tension matches the tips
During the lamination process, the machine is stopped, and a cross is made on the composite film with a force piece at the rewinding position. The most ideal state is that the composite film remains flat after the scoring. If the composite film is curled in a certain direction, it means that the tension of this layer of film is too large, and the tension of this layer of film should be appropriately reduced or the tension of another film should be increased.
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