The hottest liquid plastic packaging materials hav

2022-09-19
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Liquid plastic packaging materials have a wide market prospect

Plastic packaging containers have a broad application market, especially in the beverage industry, which has attractive business opportunities, because the demand for plastic containers for beverages such as soft drinks, fruit juices, vegetable juices is increasing day by day. In recent years, heat-resistant polyester (PET) bottles used internationally have developed rapidly, especially the application of PET bottle coating technology and plasma technology. Its impermeability is almost the same as that of glass. At the same time, it can withstand high-temperature sterilization, which expands its scope of application. It can be used for the packaging of hot filling tea drinks, beer, etc. the important reason for the passive development of the industry is that some domestic non-ferrous metal enterprises have some technological innovation shortcomings

in addition, polyethylene naphthalate (pen) new polyester bottles, which have attracted the attention of the packaging industry, are entering the beer industry, causing a revolution in beer packaging. Because the molecular structure of pen is similar to that of pet, the benzene ring is replaced by naphthalene ring, which makes pen have better permeability resistance, UV linearity, heat resistance and high temperature resistance than PET (the thermal change temperature of amorphous pen is as high as 100 ℃, while that of pet is only 70 ℃). At present, China only imports a small amount of pen, and its price is five times that of pet. But in the near future, pen will enter the packaging field in large numbers, triggering another packaging revolution after pet. Naphthalene is separated from coal tar, and China is rich in resources, so industrial production is about to be realized

The development of transparent polypropylene packaging bottles is a hot spot in plastic packaging at home and abroad in recent years. With the successful development of transparent modifier, namely nucleating agent, adding 0.1% - 0.4% sorbitol xylene (benzaldehyde) nucleating agent to ordinary PP can produce highly transparent PP, which is widely used in thermoforming containers, food, drug bottles, etc. its price is moderate. It is a competitor of PS, ABS, pet, PE bottles, and has a broad market prospect

The application of plastic in aseptic packaging provides a broad world for the development of aseptic packaging technology. Aseptic packaging refers to packaging sterilized food and beverage, dairy products, condiments, etc. in a sterile environment and sealing them in sterilized containers. This kind of package has a long shelf life under the conditions of the tightness test method of soft packaging bags without preservatives and refrigeration. The difference between sterile packaging and non sterile packaging is: non sterile packaging is packaged first, and then the package and container are cooked and sterilized together; Aseptic packaging adopts ultra-high temperature instant sterilization or microwave sterilization, which takes a few seconds or more, avoiding the excessive loss of nutrients and flavor. It is a new technology to tighten in time. In recent years, aseptic plastic bag packaging and aseptic cup plastic bottle packaging have developed rapidly

the bags in the sterile large bag packaging box generally use 5 ~ 220l, up to 1000L composite film packaging bags, which are commonly used for the packaging of tomatoes, fruit juice thick pulp, etc., and are generally stored in wooden boxes, cartons or steel drums. This kind of large bag packaging mainly adopts pet aluminized film and PE composite. Aseptic cup packaging uses multi-layer co extruded sheets PP/PE/EVA/PVDC/PS. Among them, PP is a peelable layer, which is used as the protective film of sterile packaging. On the sterile packaging, tear the PP film to expose the sterile surface of PE, and complete the process of forming, filling and capping. EVA is a bonding layer, and PVDC has good oxygen barrier. When used for packaging food, its fresh-keeping period is comparable to that of glass bottles and tin cans

at present, sterile packaging accounts for only 5% in China's beverage industry, 10% in dairy products, and 65% in developed countries. In addition, the per capita share of milk in China is 5.1 kg, while the world's per capita share is 38 kg. The per capita share of fruit juice in China is 1.2 kg, while the world's per capita share is 8.8 kg. It can be seen that there is great room for the development of aseptic packaging in China

The characteristic of m-LLDPE is that it can effectively improve the performance of packaging materials and reduce the phenomenon of penetration and cracking. When making bags with heat sealed bags, it has excellent heat sealing property. It is an ideal packaging material, suitable for packaging milk, soy sauce, vinegar, etc. This new material has its advantages, but in molding processing, due to its high molecular weight and high precision, it is difficult to process with pure m-LLDPE, and the equipment cannot bear it. At present, most of them adopt blending modification, add about 40% of LDPE or HDPE, and adopt multi-layer coextrusion blow molding processing, which is the practice of general enterprises and has achieved good results. In a word, metallocene polyethylene has broad development prospects

information source: National Plastic processing industry information center

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