Milk is one kind of liquid food, when we choose the packaging material for milk, there are so many factors we need to consider about. Generally speaking, PE film (milk pouch) is the first choice to pack milk.The film were seperated into 3 types according to the layer structure：
Option 1: single layer films
Option 2: three-layer co-extruded films
Option 3: five-layer co-extruded films
Option 1: single layer films introduce.
Pe and white masterbatch processed by blown film machine, the finished blown film is non barrier structure.This film mainly used for “ready to eat” dairy products.The dairy products usually been processed by pasteurization and the lifetime around 3 days.
Option 2: three-layer co-extruded films introduce.
Made by ldpe、lldpe、evoh、mlldpe and white or black masterbatch. The outside layer is lldpe and ldpe. Middle layer is hdpe and lpe, the middle layer makes the barrier perfermance better. Inner layer is ldpe +lpe and black masterbath, the black masterbatch keeps the film untransparent and easy to seal this three-layer film totally match with the expecttion of right packaging material for milk. High temperature sterilization and hydrogen peroxide sterilization make the lifetime of the milk more than 30days.
Option 3: five-layer co-extruded films introduce.
This kind of film is different with the three-layer co-extruded film, there is a barrier layer(made from eva、eval) in the middle part. This packaging film is processed under aseptic producing line and the performance of hot seal and oxygen resistance is excellent. These features keep the food in a long lifetime, almost 90 days under room temperature. On another hand, this packaging film applied in various of different fields due to the low cost , low transportation cost and easy stock.
