According to the number of plastic film layers, plastic vacuum bags can be divided into two major types of vacuum bags: 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 have many uses in shipping packaging and selling packaging. So how do we choose plastic vacuum bags after all? The packaging bag will select the key for our recommendation today.
Packing bag
1. The puncture resistance of plastic bags after vacuum. Whether it is shipping packaging or selling packaging, one of the important functions of packaging bags is to maintain food. If most of them are punctured, they will not be able to maintain. So we have to understand whether our products have sharp and hard substances, and what level of puncture can reach. In the common method, let the packaging manufacturer supply the samples, test it by vacuum packaging, and then throw, throw, and press, and then see if there is a bag breakage phenomenon.
2. In what environment is the vacuum bag used? Including processing environment, storage environment, transportation environment, different environments require different plastic films and printing processes. For example, the ready-to-eat brine duck feet, after vacuum packaging, choose high temperature sterilization and water sterilization, and the requirements for the packaging materials are different. High temperature sterilization requires that the plastic film be resistant to high temperatures above 121 ° C, and water sterilization requires high temperature resistance of 100 ° C, and it is not soluble in high temperature environments, and its water resistance is strong.
3. Maintain other food needs. Vacuum bags are used for food to extend the shelf life and better preserve its color, fragrance 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 aromatic molecules. Plastic bags must have oil resistance and aroma retention.