The characteristics of flexible packaging materials

After the goods are packaged, they are required to protect the goods, prevent quality changes, and ensure quality. After printing, they must play the role of beautifying the goods, explaining the goods, and promoting the goods. During the entire distribution process, commodities must go through packaging, transportation, sales, and other aspects. At each stage, packaging materials must have characteristics corresponding to them.

1, protection performance

First, the packaging material must have a certain degree of mechanical strength. Different goods have different requirements for packaging materials. For example: food packaging materials must fully comply with food packaging hygiene standards. That is, the packaging material does not migrate toxic substances, non-toxic, odorless, no odor. In addition, it is necessary to clarify the nature of the contents. For moisture-proof packaging, vacuum packaging and air-packing, there is a function of blocking the water vapor in the environment, the penetration of oxygen into the packaging bag, and the prevention of the escape of inert gas inside the bag. The packaging of quick-frozen vegetables and frozen foods must be resistant to low-temperature freezing. The packaging materials for microwave sterilized foods and the production of "boiler bags" require a function of high temperature cooking without shrinkage deformation. For oil-containing food packaging, it is required to have air tightness, oil resistance, and UV penetration resistance. For skin packaging and shrink packaging, the plastic film is required to have a certain shrink tension. For packaging such as tea, tablets, and biscuits, it is necessary to have a high degree of moisture resistance, airtightness, and shading, in order to maintain its original flavor. For packages such as fresh vegetables and fruits, if moisture- and gas-tight packaging materials are also used, side effects will occur because vegetables and fruits need an adequate supply of oxygen to keep them fresh.

2, operating performance

For plastic packaging and printing materials, it is necessary to print first, or to solve the problem of printing fastness after pretreatment. Also required to have a certain degree of stiffness and stiffness, can adapt to automatic packaging machinery packaging, heat sealing mechanical seal, bag making, and easy to fill real items, easy to reveal and other properties.

3, delivery and storage performance

The packaging must have a certain compressive strength and it is not easy to break when subjected to general pressure in the circulation area. The shape of the package should be easy to pile up and occupy less site performance.

4, promotional performance

The color of packaging styling should be novel, the color of decorating and printing should be bright and generous, and it should be in line with the hobbies of the sales regions and be competitive in the market. In addition, static electricity is also required to protect it from dust. (Dou Xiang) ("Printing Weekly")