Development and application of the hottest high pe

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Development and application of high-performance plastic bottles

experts predict that beer sales will exceed 23 million tons this year, 26 million tons in 2005 and 32.5 million tons in 2010. Therefore, it is of great significance to study high-performance plastic bottles, especially polyester drinking bottles

high performance plastic bottles have always been the perfect goal pursued by the food industry and packaging industry. Among polyester drinking bottles, polyethylene terephthalate (PET) is the preferred material and main raw material in the field of beverage packaging. It has many advantages, such as transparency, stable chemical properties, relatively good barrier, light weight, low price and recyclability. Therefore, it is widely used, but as a beer bottle, pet's gas barrier is still not high enough

(I) overview of modified polyester bottles

high performance packaging is the basic element of plastic packaging. Therefore, the performance of packaging materials can be greatly improved by modifying the packaging materials. Figure 1 is an example. The packaging containers are very different before and after deformation, which has been greatly improved. The barrier property of polyester needs to be modified, and the surface nano coating modification of polyester drinking bottles is one of the most important and effective methods

therefore, constantly improving the gas barrier of polyester bottles is a major research direction of beer plastic packaging, and its application is also increasing. Among them, the surface nano coating method is the most widely studied and most invested new process technology, and now it has become an important means to improve the gas barrier of polyester bottles

some research and development companies in the food industry and packaging industry believe that high barrier PET bottles will soon appear on the market, and will initially be used in the more expensive premium beer bottle market. Some experts believe that within 1-2 years, plastic packaging will enter the beer market in large quantities, which is very beneficial to the normal work of the experimental machine. Plastic beer bottles that have been commercialized or have been tested for sale abroad have begun to emerge, according to incomplete statistics, Beer packaging in the European PET packaging market has increased from 0.4% in 1997 to 1.7% in 2002

relevant experts predict that pet will be used to produce plastic beer bottles worldwide by 2005. It will reach more than 1million tons, and North America will become the world's largest market, up to more than 250000 tons, followed by the Asia Pacific region, up to 235000 tons. By 2007, pet for beer packaging in Europe will reach 841000 tons (accounting for 3.7%). Mr. Gordon boekner, President of the American business/Packaging Development Association, believes that the number of high barrier PET bottles used for packaging fruit juice, tea and sports drinks has increased from 2.8 billion in 1996 to 8.4 billion in 2000. The long-term growth market territory of high barrier PET bottles also includes instant coffee, tomato juice, etc. He said that 95% of the total consumption of 3.6 billion in 1996 was glass containers, while by 2000, high barrier PET bottles accounted for 50%. It can be seen that the growth rate of PET polyester resin for packaging is one of the spots

(II) amorphous carbon coating modification technology

amorphous nano carbon coating technology (ACTIS) is developed by French HDEL company, which is a new nano carbon coating technology type high barrier treatment technology. The key point of the new technical method is to make the plasma acetylene condense and deposit on the inner wall of the PET bottle to form a highly hydrogenated amorphous carbon, uniform, nano solid thin film with a thickness of 20 ~ 150nm

treated with ACTIS process: compared with ordinary PET bottles, the oxygen isolation effect of PET bottles is increased by 30 times, the permeability of CO2 is increased by more than 7 times, and the permeability of acetaldehyde is increased by 6 times. With this kind of: after PET bottled beer is stored for 6 months, the loss rate of carbonated gas is only 6%, which is lower than the current 10% carbonated gas loss rate of beer industry standard

the safety of the coating on food has been recognized by EU safety agencies and approved by FDA for food packaging. Processed by ACTIS process: pet and bottles have strong advantages in recycling. Due to the small amount of coating materials and similar structure to polymers, the physical properties and color of fibers made from recycled ACTIS bottles have no effect. Mixing with other raw materials without surface coating will not affect the characteristics of the final packaging and the conversion process. It is reported that the first batch of production equipment.Actis20 produced by French Sidel company can process 10000 0.6L polyester PET and bottles per hour. The equipment has been sold to the United States, Japan, Australia, the European Union and other countries, and the market prospect is very good

(III) plasma coating modification technology

polyester (plyester) - is the greatest invention in the packaging industry in the 20th century. For polyester, the surface nano coating method is one of the most important and effective methods. It uses a variety of high barrier coatings and coating technologies to form a thin barrier coating on the inner and outer surfaces of PET bottles, isolate the entry and exit of gases, improve air permeability, and achieve the purpose of food preservation and long shelf life. It is increasingly widely used

among various surface technology coating methods, plasma nano coating technology has the most market potential. It is also a hot spot in the modern development of these properties, including tensile strength, tensile strain at break and tensile elastic modulus. The research of plasma nano surface treatment began in the late 20th century. It is a vacuum dry treatment process, which has the advantages of simple operation, cleaning, high efficiency, safety and pollution-free, and can meet the requirements of environmental protection. The coating thickness of plasma surface treatment is nanometer, which can significantly improve the physical properties of the material interface and ensure that the material matrix will not be adversely affected

(IV) modification technology of silicon oxide coating

according to the latest information, Coca Cola company of the United States, in cooperation with Essen University of Germany, Krones company of Germany and LEYBOLD system company, has developed the "silicon oxide nano treatment pet bottle" technology to improve the permeability. Under the condition of high vacuum plasma, SiOx is used for vacuum physical vapor deposition, and the treatment layer is outside the PET bottle. It is reported that PET bottles treated with this process can improve the impermeability by 4 times, extend the shelf life for at least 6 months, and do not affect the smell of beer. According to Germany: Krones, the treatment process cost of this method is more economical than using pen bottles or multi-layer bottles. In cooperation with LEYBOLD, the company has installed a production line in a Coca Cola bottling factory in Germany and put it into use

in addition, according to foreign reports, Swiss Tetra Pak packaging company has developed a technology of plasma coating nano SiOx coating on the inner wall of PET bottles, which can form a glass like barrier coating with a thickness of 50 ~ 100 nm on the inner wall of PET bottles. The shelf life of filling beer or fruit juice with this bottle can be extended to 1 imported detection instrument, which has occupied China's main market for 2 months. The system can handle 18000 pe3 and bottles of less than 2L per hour, and has been applied in spendups company in Sweden, with a very good market prospect

(V) diamond type carbon coating modification technology

according to a recent report in the journal, Japan's Nissin ASB company has cooperated with Kirin Beer Company, Mitsubishi trading company and youtec company to jointly develop a diamond type nano carbon coating process (DLC). The DLC process uses high-frequency vacuum discharge to form a fine coating with a thickness of 20 ~ 40nm, similar to diamond carbon structure, on the inner surface of PET bottles with ionic carbon and hydrogen. This peat bottle has higher oxygen permeability than ordinary pet. The bottle is increased by more than 20 times, the resistance to CO2 is increased by 7 times, the resistance to water vapor is increased by 8 times, and the UV resistance is also greatly improved. The nano coating not only has high transparency, the coating is not easy to crack, but also has good acid-base resistance. These companies are cooperating to develop industrial production equipment and plan to promote it to the Southeast Asian market first

(VI) other coating modification technologies

according to incomplete reports, SIPA company in Italy has developed an epoxy polyurethane coated PET bottle. This process uses the epoxy polyurethane barrier coating of PPG company in the United States to form a bright wear-resistant, scratch resistant barrier coating. Swiss instant surface technology company has developed a plasma coating technology that can be applied at atmospheric pressure to deposit the barrier layer on the inner wall of PET bottles. It is said that this technology does not need expensive equipment, simplifies the coating process, and the oxygen isolation of coated PET bottles is 10 times higher than that of ordinary bottles. In addition, Swiss tetrs Pak company also launched a new barrier coating technology, which uses a PET bottle to achieve the desired barrier effect by adjusting the thickness of the barrier layer. The barrier layer adopts thermoplastic epoxy resin from Dow Dow Chemical Company, which has both high transparency and excellent gas barrier performance

recently, DuPont polyester (Du Pont) developed a new two-stage external coating technology, which can improve the impermeability of PET bottles to 02 and CO2 by 30 times, and the undercoat can be separated by water. The material recovery is very convenient, which is a beautiful green package. Another external coating technology called "transparent aluminum" developed by DuPont company can improve the impermeability of PET bottles by 30 ~ 40 times, which is close to commercialization

nevertheless, the barrier performance of the coating improved by surface coating technology may be affected by the surface area of the bottle. In addition, the inner coating has food safety problems, which must be certified by the safety authority. In addition, the toughness of some coatings is poor, among which SiOx coating is brittle and easy to be broken compared with the operation steps of tension wheel torsion testing machine; Other methods also have more or less problems, which need to be further improved

in a word, we still have a long way to go in the packaging world in the future, and there is a lot of work to be done to develop a new nano surface coating process to comprehensively improve the performance of drinking polyester bottles

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