To prevent the film from breaking under high temperatures

LDPE (MFR: 2 g/10 min) 35%, LLDPE (MFR: 1.8 g/10 min) 35%, LDPE (4 g/10 min) 30% R blend produced by DOW Chemicals was blown. Blow-up ratio of 2-3, masterbatch 3-4%, results in hot filling at 100 °C, easy to pull off, why? The film thickness is 65 μm.
This polyethylene blend should be hot-filled at 100°C, and I am afraid that under the pulling force of the filling, even if it does not break, it will have a larger tensile deformation.
Generally, this type of liquid filling film is preferably made of a coextruded composite film with high temperature resistance and good strength, such as nylon. Adhesive resin / PE, although the inner layer is still PE, but the outer layer of nylon film, heat resistance, high strength, but can not use the fuse to fuse and fuse pockets. The PP/EVA/PE coextruded film can be used for melting but the sealing temperature is higher at 190-200°C. The thickness is appropriately increased to 80-90 μm to ensure the strength of the composite film.
Another reason is that the tension is too great. The solution is to reduce the pull of the packaging machine. In fact, after sterilization at 100°C, proper cooling is performed to reduce the temperature of hot filling. As long as it is performed in a sterile room, it also has better packaging effect.