What are the advantages of plastic packaging materials compared with other packaging materials?
1. The relative density of the plastic is generally 0.9~2.0 g/cm3, with only 1/8~1/4 of the steel, 1/3~2/3 of aluminum, 1/3~2/3 of the glass, and the strength of the material unit weight is higher. In the same volume of packaging, plastic material will be much lighter than glass and metal materials, which will save transportation costs and increase actual transport capacity. Plastic packaging materials on the tensile strength, rigidity, mechanical properties such as impact toughness, durable thorn, certain intensity on some relatively poor packaging materials such as metal, glass, but the paper material is much higher; And the plastic material applied in packaging industry, certain characteristics can meet the different requirements of packaging, such as plastic good resistance to shock than glass, can withstand extrusion; It can be made into foam plastic to act as a buffer to protect fragile items.
2, suitable permeability barrier property and choose the right plastic materials can be made into barrier property is suitable for packaging, including the gas packing, waterproof moisture-proof packaging, packaging, packing and so on, used to wrap easy oxidation by oxygen, moisture, mildew corrupt food packaging materials, etc. For some fruits and vegetables fresh food, for packaging requirements have gas and moisture permeability, to satisfy the respiration of vegetables and fruits, with plastic packaging for the system can meet the above requirements.
3, chemistry stability is good Plastic to general media such as acid, alkali, salt has good resistance ability, enough to resistance from the packing materials (such as acid ingredient in food, oil, etc.) and the packaging of the external environment of water, oxygen, carbon dioxide and various kinds of chemical medium corrosion, this metal has a strong advantage.
Transparent plastic wrap film
4. Many plastic packaging materials with good optical performance have good transparency. The packaging containers can clearly see the inner contents, and have a good display and promotion effect.
5. The hygienic good pure polymer resin is almost free of toxicity and can be used safely for food packaging. But individual resin monomers (such as vinyl monomers polyethylene) when used in food packaging container if the content is too high, more than a certain concentration, easy to migrate to the packaging of food, the food into the human body has certain harm effect, if try to monomer in the resin polymerization process control under a certain amount, can ensure their health.
6. Good processing performance and decorative plastic packaging products can be molded by extrusion, injection, and plastic, etc. It can also easily take up beautiful colors or print decoration patterns. The plastic film can also be conveniently used in automatic packaging machine automatically forming, filling, heat sealing, high production efficiency.
7, plastic packaging materials, despite the above advantages, but also has many shortcomings, such as high strength and hardness than metal material, heat resistance and cold resistance is poorer, the material easy to aging, such as the weakness of their use range was limited.