The hottest liquid plastic packaging materials hav

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The market prospect of liquid plastic packaging materials is broad.

Plastic packaging materials after more than 20 years of development, new products emerge in endlessly. However, from the perspective of the industry as a whole, the development of plastic packaging materials is hindered by factors such as the convergence of plastic packaging materials structure, weak scientific and technological development capacity, insufficient sources of funds and so on. Therefore, only by seeking new growth points can we promote the development of packaging materials. The urgent task is to take the road of high-tech units as J technology, and develop new products and new application fields

at present, PVC and pet are the main five gallon drinking buckets on the market, which has brought many problems. The toxicity of PVC drinking bucket additives has always been controversial, and pet drinking buckets meet the health requirements. However, due to the chaos of the market order, inferior products are replaced by good ones, and old materials are passed off as new materials, so that the bacterial content in the barrels exceeds the standard. The main reason is that the unqualified barrel of barreled purified water belongs to non food grade. Therefore, it is urgent to develop food grade PC raw materials. Shanghai and Bayer have signed a contract to build 100000 ton PC resin. The first phase was put into operation in 2003, with an annual output of 50000 tons, which can alleviate the long-term situation of importing PC. In recent years, PC drinking buckets have developed rapidly, with an annual output of more than 50million in Shanghai and Guangdong alone. Therefore, with the production of domestic raw materials, the development of PC beverage bottles will be an opportunity

the application market of plastic packaging containers is broad, among which, the beverage industry has attractive business opportunities. In 2000, the output of beverages has reached 13million tons, and the demand for plastic containers for soda, fruit juice, vegetable juice and beverages is increasing day by day. Only for beer packaging, the heat-resistant polyester bottle (PET) used internationally in recent years has developed rapidly, especially the application of PET bottle coating technology (plasma technology), which is coated with a 0.2mm carbon layer inside. Its permeability is almost the same as that of glass. At the same time, it can withstand high-temperature sterilization treatment, so that its application range is expanded, and it is suitable for the packaging of hot filled tea drinks

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, using naphthalene ring instead of benzene ring 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 ℃). In the near future, pen will enter the packaging field in large numbers, triggering another packaging revolution after pet. At present, a small amount of domestic imports, but the price is 5 times that of pet, but this is not the key to the problem. 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 nucleating agent, 0.1% - 0.4% sorbitol xylene (benzaldehyde) nucleating agent (American Milliken, new Japan physicochemical, Mitsui East Asia, brand millad3988, etc.) is added to ordinary pp. high transparent PP can be widely used in injection, blow extrusion, blow drawing, extrusion, thermoforming containers, food, drug bottles, etc. its price is appropriate, and it is a competitor of PS, ABS, pet, PE bottles, It has broad market prospects

The application of plastic in aseptic packaging provides a broad world for the development of aseptic packaging technology. Aseptic packaging refers to packaging sterilized foods (beverages, dairy products, condiments, etc.) in a sterile environment and sealing them in sterilized containers; The package has a long shelf life without preservatives and cold storage. 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. In recent years, aseptic plastic bag packaging and aseptic cup plastic bottle packaging have developed rapidly

aseptic large bag packaging (bag in box) refers to a composite membrane packaging bag with a packaging container of 5-220l and a maximum of 1000L, which is placed in wooden cases, cartons or steel drums for packaging tomatoes, fruit juice slurry, etc. This kind of large bag packaging mainly adopts pet aluminized film and PE composite, and is produced in Shanghai, Guangzhou, Yangzhou Changlong, Shaanxi Longxi, Xinjiang and other places

sterile 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. It is used for packaging food, and 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 5.1kg, 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 there is great room for the development of aseptic packaging in China. The development of sterile packaging materials is also one of the development directions of plastic packaging

in 1991, Exxon first produced metallocene polyethylene. Subsequently, Dow Chemical Company's technology has also been improved, which can measure relevant data. Mitsui chemical also followed to produce new brands and varieties. The successful development of this technology has created a new era of plastic packaging, which is listed as one of the major events in the packaging industry in the 20th century. The so-called metallocene polymer refers to the polymer polymerized by using the organic metal complex composed of transition metals and cyclic unsaturated cyclopentadiene (i.e. cyclopentadiene) as the catalyst. At present, the main ones are MP. The sensor has high accuracy e, MPP, MPs, etc. The biggest difference between metallocene catalysts and traditional catalysts is that the previous catalysts have many active centers. Therefore, there are more branch bonds on the molecular bonds of polymers, which hinder the spatial tightness of macromolecular chains and produce performance differences; The metallocene catalyst has only one active center, so it can accurately control the relative molecular weight and molecular weight distribution. The relative molecular weight distribution is very narrow and there are few impurities. Therefore, the thermal properties, tensile strength and puncture resistance of m-LLDPE films are better than those of traditional LLDPE films. These characteristics of m-LLDPE can effectively improve the performance of packaging materials and reduce the phenomenon of penetration and cracking. When making bags with heat sealed bags, m-LLDPE 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 terms of forming processing, due to its high molecular weight and high precision, it is difficult to process too idle with]00% 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 Sichuan 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

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