Application and development of the hottest plastic

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Application and development of plastic packaging materials in the food industry

wrapping film as a packaging material has the following characteristics: it is self-adhesive, and the packaging process does not need heat shrinkage treatment, which is conducive to saving energy and reducing packaging costs. At the same time, it can wrap the goods as a whole, which is convenient for loading and unloading, and improve freight efficiency, that is, the method of "often taking a sample for 10 (30) minutes to complete the integrated loading and unloading" combined with pallet and truck, The transportation cost has been reduced and has been included in the "Tenth Five Year Plan" for the improvement of commodity packaging and transportation

The application of plastic in sterile packaging provides a broad world for the development of sterile 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 that non sterile packaging is packaged first, and then the packaging is cooked and sterilized with the container, while sterile packaging adopts ultra-high temperature instant or microwave sterilization, which takes only a few seconds or more, avoiding the excessive loss of nutrients and flavor. It is a new technology. At present, in addition to sterile cup packaging, sterile plastic bag packaging and sterile cup plastic packaging have developed rapidly in recent years. These two kinds of packages are briefly introduced

sterile large bag packaging (bag in box) refers to the composite membrane packaging bag with a packaging container of L and up to 1000L. The bags are packed 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 exported to 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 a protective film for aseptic packaging. On the sterile package, tear off the PP film, expose the sterile surface of PE, and complete the forming filling capping process. 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, aseptic packaging accounts for only 5% in China's beverage industry, 10% in dairy products, and 65% in developed countries. In addition, China's per capita milk accounts for 5.1kg, while the world's per capita accounts for 38kg; The per capita share of fruit juice is 1.2kg in China and 8.8kg in the world. 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

the market prospect of fresh-keeping packaging film for vegetables and fruits is broad.

China's total output of fruits and vegetables in 2000 reached 71 million tons, and the output of vegetables was 300 million tons. It is the world's largest country in the production and sales of fruits and vegetables. However, about 30% of the fruits are lost in the process of storage, transportation and sales. Among them, improper packaging is one of the causes of fruit decay and loss. In the highly competitive market, the role of packaging is becoming more and more important. Fresh fruits and vegetables are an active body. They are still breathing after picking, and have vigorous life. They mainly rely on the consumption of their own nutrients and water to maintain life. If the fruits are not preserved in time after harvest, they will wither in less than 10 days and a half months, deteriorate in quality and decay, and lose their edible value. Although the physiological properties of different fruits are different, color change, water loss, taste change and decay are common problems. Therefore, how to inhibit the metabolic process, reduce the consumption of nutrients, and maintain the flavor quality of fruits is an important topic of fresh-keeping packaging. At present, polyethylene film and polypropylene film are the most widely used packaging materials for fresh fruits and vegetables. Different fruits and vegetables have different requirements for fresh-keeping packaging bags. The following factors should be considered when choosing a film bag

1. Appropriate gas permeability, maintaining appropriate O2 and CO2 concentrations. According to the test, if the air permeability is poor, the O2 concentration in the bag is too low (3%), it is easy to produce ethanol and acetaldehyde volatiles, resulting in peculiar smell, and too high CO2 concentration (10%) will also cause damage to fruits. Therefore, new polyethylene fresh-keeping films are also being developed, and the emergence of microporous films has added new options to the packaging of tropical fruits. The market of microporous film is increasing and its application is expanding

2. Add ethylene gas absorbent. During the post harvest ripening process, fruits release ethylene gas and become plant growth hormone hormones. The accumulation of ethylene in the packaging bag will accelerate the aging of fruits and reduce the storage period. Therefore, in the film manufacturing process, it is necessary to add porous substances such as silica (zeolite, rutile, quartz, SiO2) to adsorb the ethylene released by the fruit, so as to slow down the respiration of the fruit and keep the fruit fresh

there are potential attractive business opportunities in the plastic beverage bottle Market

the application market of plastic packaging containers is broad, including the beverage industry? Attractive business opportunities. In 2002, the output of beverages has reached 20.24 million tons, and the demand for plastic containers for soda, fruit juice, vegetables and beverages is increasing day by day

according to the survey, China's beverage output in 2002 was nearly 23.84 million tons, with an annual growth rate of more than 20%, while the application proportion of PET bottles in carbonated beverage packaging accounted for 57.4%, and the market prospect was promising. At present, the enterprises with large PET bottle output in the industry include Zhuhai Zhongfu and Shanghai Zijiang group, accounting for 30% and 20% of the domestic PET bottle market shares respectively. Zhuhai Zhongfu company is the first pet bottle manufacturer recognized by Coca Cola and Pepsi Cola. In 2001, there were 3.2 billion PET bottles, including 700million hot filled bottles, with a sales volume of 2.34 billion yuan. It has more than 30 factories all over the country; Shanghai Zijiang group has developed rapidly in recent years, with 15 holding companies located in various regions, occupying Wuhan, Zhengzhou, Tianjin, tooling costs and labor costs, which have also significantly decreased in Changchun, Kunshan, Chengdu and other markets. The new pet filling bottles with an annual output of 120million have been put into production. In 2002, it invested and built factories in Shanghai, Guangzhou, Chengdu, Beijing and other places, with a production capacity of 485million hot filling bottles

polyester bottles started late in the plastic packaging industry. The introduction of a large number of injection, drawing and blowing technology and equipment has promoted the rapid development of PET bottles, and with its excellent performance, it has been welcomed by users. In just a few years, it has become a mainstream packaging material for edible oil and beverage bottles. At the same time, the demand in cosmetics, medicine and other industries is also increasing. In 1996, the output of PET bottles was 3billion, but it rose to 5billion in 1998, reached 8billion in 2000, 9billion in 2001, and is expected to reach 10billion in 2002, with an annual growth rate of 18%. It has become a plastic packaging material. 8. It has the largest growth rate in hydraulic strength test and tightness test. Especially since 2001, with? The domestic tea beverage market has sprung up. In 2001, the output of tea beverage has reached 3million tons. Therefore, hot filled ℃

pet bottles have become the fastest-growing variety of polyester bottles, with an annual growth rate of more than 50%

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, adding 0.1%-0.4% sorbitol xylene (benzaldehyde) nucleating agent to ordinary PP, can make high transparent PP, which can be widely used in injection, extrusion, blow drawing, extrusion, hot containers, food, drug bottles, etc. its price is appropriate, and it is a competitor of PS, ABS, pet, PE bottles, and has a broad market prospect

beer plastic packaging bottles have been applied in the spring

in recent years, heat-resistant polyester bottles (PET) for packaging have developed rapidly internationally, especially the application of PET bottle coating technology (plasma technology), which is coated with 0.21mm carbon layer inside, and its barrier property 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, it has attracted the attention of the packaging industry? Ethylene glycol dicarboxylate (pen) new polyester bottles are entering the beer industry, causing a revolution in beer packaging (a good strategy to overcome the beer bottle explosion). Because the molecular structure of pen is similar to that of pet, the benzene ring is replaced by a ring, which makes pen have better permeability resistance, UV resistance linearity, good heat resistance and high temperature resistance than PET (the thermal change temperature of amorphous pen is 100 ℃, while that of pet is only 70 ℃). As it is separated from coal tar, China has rich sources, so industrial production is about to be realized. 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 five times that of pet, which hinders the application of pen

China is a major beer producer. Since 2002, it has reached 23.86 million tons, ranking first in the world. Calculated in 2002, the annual demand for packaging bottles is billion, providing a broad space for the development of PET bottles. In recent years, the annual meeting of plastic packaging has conducted technical exchanges for many times to guide relevant enterprises to develop. In terms of technology, beer is different from ordinary carbonated beverages. Even a small amount of oxygen entering the packaging container will change the taste of beer, and the loss of CO2 in beer will affect the foam characteristics. Therefore, how to meet the requirements of freshness and shelf life requires high barrier performance. At the same time, 95% of beer in China is produced by pasteurization, and the use of packaging bottles is required to be resistant to ℃ cooking. These requirements have become the key issues in the development of plastic beer bottles

Zhuhai Zhongfu Group actively adopts new technologies, invests a lot of money in research and development, and adopts co injection technology and bottle blowing technology, which can make the fresh-keeping period of beer in PET bottles reach 100 days. It has tested and produced 350 ml and 500 ml PET bottles, and is developing 1.5L and 2L beer bottles. At present, a new plant is under construction, ready for mass production, as a new profit growth point

the market of drinking water packaging bottles (barrels)

pure drinking water has entered thousands of households. At present, the 5-gallon drinking buckets in the market are mainly PC, PVC and pet. There are many problems in the use of the latter two. The toxicity of PVC drinking bucket additives has been controversial, and pet drinking buckets meet the health requirements. However, due to the market shoddy, old materials are passed off as new materials, so that the bacterial content in the buckets exceeds the standard. According to the spot check, in some places, more than 1/2 of the barreled purified water is unqualified, and the main reason is that the barrel material is 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. So, follow? The production of domestic raw materials and the development of PC beverage bottles will be a rare opportunity

the national bottled aquatic product volume is 5.54 million tons, accounting for nearly 1/4 of the total beverage volume. After years of competition, large-scale production has been formed, and a number of strong enterprises have emerged, such as Wahaha, robust and other top ten enterprises. The variety of packaged water has also developed from the original mineral water bottles to distilled water, active water, oxygen enriched water, space water and other bottled water, and is developing towards brands. The quality requirements of the required packaging bottles are also higher. This will be a sunrise market

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