1. The tropical zone needs heat energy to make the upper zone and the lower zone work. If it does not reach an appropriate temperature, it is basically impossible to bond. We usually call it the action state, which usually includes temperature, action time and pressure. These three combinations often have different parameters due to different upper zones or different lower zones, that is, different upper zones or lower zones are used, Proper adjustment of sealing parameters is a necessary action.–carrier tape
2. There are two common heating adhesive systems on the front, EVA (polyphylene vinyl acetate) and SBR (styrene butadiene rubber), which are often used for heating viscose layer. What is the difference between the two adhesives? The sealing degree of EVA adhesive is lower than that of SBR, that is, for any lower belt, it has relatively low action temperature. On the contrary, SBR has high shear force and high viscoelastic capacity. For the same substrate, if SBR and EVA want to obtain the same viscosity (peel force), SBR needs higher temperature and higher shear capacity than EVA. As for which kind of SBR or EVA glue is better, it depends on the needs of users, and there is no absolute conclusion.—carrier tape
3. Different materials of packaging lower belt have different sealing characteristics; Under the same taping machine and the same sealing conditions, PVC is more viscous than PS, and PS material can obtain higher viscosity than PC material. This is because each polymer has different surface energy, and different temperatures are needed to obtain the same viscosity.