The latest achievements of PET beer bottles

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The latest achievements of PET beer bottles in the molding process of nano polyester bottles (middle)

. With high-frequency current acting on the electrode, at this time, the coating room is the outer electrode, and the acetylene tube is the inner electrode; Due to current discharge, acetylene is decomposed into ionic carbon and ionic hydrogen. Ionic carbon and ionic hydrogen are combined on the inner surface of the bottle to form a fine coating

the thickness of this carbon based coating deposited by steam is 20nm~40nm, which is 20 times greater than the gas resistance of ordinary PET bottles, the permeability of CO2 is increased by seven times, the permeability of H2O is increased by eight times, and the UV resistance is also enhanced

2. PET bottles with barrier coating

various high barrier coatings and coating technologies are used to form a very thin barrier layer on the inner or outer surface of PET bottles, which can also effectively extend the shelf life of PET bottled beer. Plasma coating technology has become a hot spot of development and application since 1999

(1) plasma coating "amorphous carbon" coating

Kirin Beer Company of Japan cooperated with Mitsubishi Corporation, Nissin ASB machinery company, a bottle blowing machine manufacturer, and youtec company, a manufacturer of plasma chemical vapor deposition (CVD) devices, to develop the patented technology of plasmon CVD coating for PET bottles earlier. This technology is to vacuumize the inside and outside of the PET bottle, fill the bottle with methane, acetylene and other hydrocarbon gases, and discharge the hydrocarbon gases in the bottle with high-frequency or microwave on the outside of the bottle, so that the hydrocarbon gases in the bottle 1 are focused on building a world-class industrial event of new materials industry. The body is decomposed and plasma, and the carbon ions and hydrogen ions produced are evaporated on the inner wall of the bottle together, forming a thickness of only 0.02~0.04 μ M "diamond like carbon" (DLC) coating. It is said that the gas permeability of this coated bottle is more than 10 times that of ordinary PET bottles, which can compete with glass bottles, and the coating is soft and not easy to crack. Now develop practical production equipment and commercialize it. It is reported that these Japanese companies see that the traditional beer bottle packaging containers are in short supply in China, so they intend to first promote and apply their technology in China

(2) barrier technology for PET beer bottles

Mitsubishi Plastics Co., Ltd., Nissin ISB Machinery Co., Ltd. and utaike Co., Ltd. recently announced that the three companies have jointly developed the film coating technology in PET bottles, which can be evenly pasted with a layer of carbon dioxide film with a thickness of 20~30nm inside the bottles because the wood plastic composite materials are processed from various waste plastics and waste wood, so as to achieve the same anti-seepage effect of glass bottles. The 500ml beer bottle weighs 30g, It is 1/10 of the glass bottle

the new three in one barrier technology of PET bottle blank blowing developed by tetra company in Geneva, Switzerland and toyoseikan company in Tokyo may have a great impact on the beer packaging market. Toyoseilan company has developed a new type of stretch blow molding system called s-cosmos as a supporting device, which can produce 500ml pet with heat resistance and pressure resistance. It can withstand the conditions of pasteurization under 75 ℃ for 400min, and can be produced at the rate of 30000/h

DuPont also developed an external coating technology called "transparent aluminum". The impermeability of this coated bottle is 30-40 times that of ordinary PET bottles. Now it is being tested and is close to commercialization

3. Nanotechnology to improve permeability/heat resistance

German Krupp corplast, Japanese toyoseikan and American plasticsolutionsmolding have developed their own heat setting technologies called "monotherm", "s-cosmos" and "CR yopak" respectively, which can significantly improve the crystallinity and heat resistance of PET bottles, for example, from about 20% and 85 ℃ to 39%~42% and 120 ℃ respectively, It is suitable for the packaging of in-situ pasteurized beer after filling, without the use of reinforcing ribs and reinforcing plates. These heat setting technologies need to be combined with barrier coating technology to achieve the required shelf life

the Institute of chemistry and the Institute of physics of the Chinese Academy of sciences have found another way to explore and study pet/montmorillonite nanocomposites and their applications. They have been used to make translucent beer bottle samples, which are 3-4 times higher than PET bottles in terms of permeability and heat resistance

polyethylene terephthalate (PET) is mainly used in fibers, bottles and films, and the amount of engineering plastics accounts for only a small part of its total output. As an engineering plastic, PET resin has attractive properties, but it is difficult to meet the needs of rapid prototyping in industry due to its poor melt strength, slow crystallization speed and poor dimensional stability. Major companies in the world have invested a lot of human and material resources to develop various rapid crystallization nucleating agents, which improve the crystallization rate of pet. However, the high price of these nucleating agents restricts the large-scale application of PET engineering plastics. Pet nano plastic (npet) was successfully prepared by adding organic montmorillonite and pet monomer into the polymerization kettle with the pet polymerization intercalation composite technology invented by the Institute of chemistry, Chinese Academy of Sciences. The melt viscosity and crystallization speed of npet are significantly improved, which overcomes the common "flowing" defects in the processing of ordinary PET resin, and improves the processing properties of materials and product properties. Compared with ordinary pet, the flame retardancy of npet has also been greatly improved, and it has self extinguishing property. The reinforced flame-retardant npet engineering plastics developed in combination with npet have been tested by authoritative departments, and their performance indexes have reached or exceeded those of PET engineering plastics products at home and abroad (see Table 3). They can be used to make various electrical components to replace the expensive polybutylene terephthalate (PBT) resin. The barrier property of npet is much better than that of pure PET, which meets the requirements of food packaging and can be directly used to blow bottles of beer, beverages, pesticides and cosmetics

4. The laminated PET container for Nylon Nanocomposites has excellent sealing performance and unparalleled chemical resistance.

according to the report of British European chemistry, Eastman Chemical Co., Ltd. and nano Cole Co., Ltd. have jointly developed and successfully used to manufacture multi-layer PET containers and Nylon Nanocomposites. This material has high barrier property, processability similar to pet, and can be bonded with pet. Now it has been put on trial sale. The application scope of this high barrier PET container includes beer packaging, carbonate soft drinks, fruit materials and food packaging made of tomato processing. Products made of nanocomposites can be processed on existing equipment, such as preform injection molding machines and stretch blowing machines

the oxygen barrier property of Nylon Nanocomposites under development has been greatly improved. Compared with general barrier nylon bottles, nylon nanocomposites containing 10% - 30% clay by weight have much better barrier property, and the thickness of barrier layer is greatly reduced. The turbidity of this material is 15% - 30%, which can be used to make amber containers. However, turbidity needs to be reduced so that this material can be used to make transparent packaging containers. The cost performance ratio of nanocomposites is very competitive, and clay has no impact on the recycling process. Therefore, nanocomposites have a wide range of applications

nylon nanocomposite aegisox, pamxd6/nano clay composite M9 and polyvinyl alcohol (PVA) membrane materials as raw materials of plastic beer bottles are the three most promising high-performance barrier materials

at present, Honeywell is committed to developing a nylon nanocomposite aegisox with high barrier performance and low cost as glass, which is an activation/passivation barrier material, in which nano clay is the passivation barrier layer, which acts in synergy with a suitable oxygen getter as an activator. It is said that the material can reduce the oxygen transmittance (OTR) of PA6 by 100 times, and the amount of oxygen added is almost zero. Some large PET bottle factories are using aegisox as the core layer of beer bottles with three-layer structure, and its price life can reach 180 days

eastman chemical company has also developed a nylon nanocomposite barrier material pamxd6/nanoclay barrier material M9, named imperm, in cooperation with American nanoclay manufacturer nanocor, which was commercialized in June 2000. The oxygen permeability of imperm is said to be 50-100 times greater than that of pet. The nano clay particles can also increase the melt strength and bottle rigidity. Compared with the standard pamxd6, the barrier rate of carbon dioxide and oxygen is increased by 50%~70% respectively, and the transparency and peel resistance are the same as the standard pamxd6. The company tested 25 kinds of pet/impact/pet3 bottles weighing 29g, and their barrier layers constituted 4% and 10% of the bottle wall respectively. The oxygen permeability of the former is 3-5 times higher than that of PET bottles, with 8% less atomization. The oxygen permeability of the latter is 6-11 times higher, with 15% less atomization. The uses of these high barrier PTE bottles include beer, carbonated soft drinks and fruit juice, according to the head of Zhongwang automotive division. The three-layer structure (pet/m9/pet) beer bottle can reach the shelf life of beer in the United States (110 days) and Europe (180 days)

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