According to the number of layers of plastic film, plastic vacuum bags can be divided into two types: single film and composite film. The subdivision can be divided into one layer, two layers, three layers, four layers, and even 10 layers. Vacuum bags are widely used in shipping packaging and sales packaging. So how do we choose a plastic vacuum bag after all? The packaging bag is the key for our referral today.
1. Puncture resistance after vacuum of plastic bag. Whether it is a shipping package or a sales package, one of the important roles of packaging bags is to maintain food. If most of it is punctured, it will not be able to maintain it. So we need to know if our products have sharp materials, what level can we get through puncture. In the normal method, ask the packaging manufacturer to supply samples, vacuum-pack the test, and then throw, throw, and press, and then see if there is a broken bag.
2. In what environment is the vacuum bag used? Including processing technology environment, storage environment, transportation environment, different environments require the selection of different plastic films and printing processes. For example, the ready-to-eat brine duck paw uses high-temperature sterilization and boiling sterilization after vacuum packaging. The requirements for the packaging materials are different. High temperature sterilization requires the plastic film to withstand high temperatures of 121 ° C and above, and boiled sterilization requires high temperature to 100 ° C. It is insoluble in water at high temperature and has strong water resistance.
3. Maintain other food needs. Vacuum bags are used for food to extend the shelf life and better preserve its color, aroma and taste. In addition to the need for puncture resistance, there are many other functional requirements. For example, salt-baked chicken legs and salt-baked chicken wings will have oil and aroma molecules. Plastic bags must have oil resistance and aroma retention.