The most popular liquid plastic packaging material

2022-07-30
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Liquid plastic packaging materials have a broad 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 soft drinks, fruit juices, vegetable juices and other beverages 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 plasma technology, which has almost the same impermeability as glass. At the same time, it can withstand high-temperature sterilization, which expands its application range and can be used for the packaging of hot filled tea drinks, beer, etc

in addition, the new PET bottle of polyethylene naphthalate (pen), which has attracted the attention of the packaging industry, is stepping into the beer industry and causing a revolution in beer packaging. As the molecular structure of pen is similar to that of pet, the benzene ring is replaced by naphthalene ring, which makes pen more excellent than PET in terms of permeability resistance, UV linearity, heat resistance and high temperature resistance (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. Therefore, the industrial production of whole machine life-long maintenance is about to be realized

The development of transparent polypropylene packaging bottle is a hot spot in plastic packaging at home and abroad in recent years. With the successful development of transparent modifier, i.e. nucleating agent, high transparent PP can be prepared by adding 0.1% ~ 0.4% sorbitol xylene (benzaldehyde) nucleating agent into ordinary pp. China's polyurethane industry has developed rapidly, and is widely used in thermoforming containers, food and drug bottles. Its price is moderate. It is a competitor of PS, ABS, pet and PE bottles, and has a broad market prospect

the application of plastics in aseptic packaging has provided 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 without preservative and cold storage. The difference between aseptic packaging and non aseptic packaging is that non aseptic packaging is packaged first, and then the package and container are cooked and sterilized together; The aseptic packaging adopts ultra-high temperature instant sterilization or microwave sterilization, which takes several seconds or more, avoiding the excessive loss of nutrients and flavor. It is a new technology. In recent years, aseptic large plastic bag packaging and aseptic cup plastic bottle packaging have developed rapidly

the bags in the aseptic large bag packaging box are generally 5 ~ 220l, up to 1000L composite film packaging bags, which are commonly used for the packaging of tomatoes, fruit juice slurry, etc., and are generally stored in wooden cases, 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 a protective film for aseptic packaging. On the aseptic packaging, tear off the PP film to expose the aseptic 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 can be comparable to that of glass bottles and tin cans

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

m-lldpe has the characteristics of effectively improving the performance of packaging materials and reducing the phenomenon of penetration and cracking. It has excellent heat sealing property when making heat sealed bags. It is an ideal packaging material, suitable for packaging milk, soy sauce, vinegar, etc. This new material has its advantages, but in terms of molding processing, it is difficult to process with pure m-LLDPE because of its high molecular weight and high precision. At present, most of them adopt blending modification, add about 40% LDPE or HDPE, and adopt multi-layer coextrusion blow molding, 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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