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Food Bags Have Their Own Unique Characteristics

Food bags as packaged food packaging bags, in the material selection has its own characteristics, in the packaging form and other packaging bags, but also has its own unique characteristics.

For example, food bags of raw materials can not be poisonous and harmful, therefore, it can only polyethylene, polypropylene or aluminum foil as raw materials for processing, Food Bag for some may have toxic raw materials, it can not be used, such as polyvinyl chloride can not be a food bag of raw materials, can only be used as an inner packaging to use, because in the case of temperature changes, It is likely to produce harmful substances that are detrimental to food storage and quality protection.

Food bags can not be used in the manufacture of waste plastic, Food Bag these things are harmful or unsanitary, can not be used as food bags of raw materials.

Introduction of food bag materials

The main material of food bag is PE polyethylene pp polypropylene, food bag is widely used in food bag manufacturer must have QS certification;

1. Synthetic resin

Synthetic resins are used in almost all plastics. Resin is the most important component of plastic, plays the role of adhesive, can be plastic other ingredients into a whole. Food Bag Although adding various additives can change the properties of plastics, resin is the fundamental factor determining the type, performance and use of plastics.

The types of resins commonly used in plastic decorating materials are:

Polyethylene (PE), polyvinyl chloride (PVC), polystyrene (PS), phenolic (PF), urea-formaldehyde (UF), epoxy (EP), polyester (PR), polyurethane (PU), poly (methyl methacrylate) (PUMA), silicone (SI) and so on.

According to the change of the heating, the synthetic resin can be divided into two kinds: thermoplastic resin and thermosetting resin.

2, thermoplastic resin

It has the properties of softening, cooling and hardening, and does not react to chemical reactions, which can keep this performance no matter how many times the heating and cooling are repeated. Food Bag The molecular structure of thermoplastic resins is linear. It includes all polymeric resins and partially condensed resins. Thermoplastic resins are: polyethylene, polyvinyl chloride, polystyrene, polyamide, POM, polycarbonate, polyphenylene ether, polysulfone, rubber and so on. The advantage of thermoplastic resin is that it is easy to process and has higher mechanical energy. Food Bag The disadvantage is that the heat resistance and rigidity are poor.

3, thermosetting resin

After the resin is heated, the chemical change is gradually hardened, and then the heat is not softened or dissolved. The molecular structure of thermosetting resins, Food Bag which includes most of the condensed resins, has the advantages of high heat resistance and hard deformation. The disadvantage is poor mechanical properties. Thermosetting resin has phenolic, epoxy, amino, unsaturated polyester and silicone ether resin.