Coating technology of barrier layer on the surface

2022-08-26
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Coating technology of barrier layer on PET bottle surface

the use of surface coatings such as silicon oxide to improve the barrier property of PET film has been applied in industry. People also try to improve the barrier property of PET bottles by vacuum coating the main experimental force F1 (n) on the pet bottle wall to meet the needs of beer packaging, but due to the poor coating strength, it has not yet been applied

Japan Nissin ASB Machinery Co., Ltd. and France Sidel company actively promote the surface coating technology of PET beer bottles. The basic principle is to use the plasma deposition surface coating technology to form a barrier layer on the inner wall of plastic bottles

this new technology called ac-tis barrier layer (internal surface of amorphous carbon treatment) is by sending acetylene gas into the bottle under vacuum conditions, and then using the energy of microwave to convert acetylene into plasma state. This kind of plasma will move in the bottle at a high speed in an orderly way. The biggest driving factor is the express industry. When high-energy ions touch the inner wall of the bottle, they will fall into the surface of the inner wall, and finally condense and generate a solid film of highly hydrogenated amorphous carbon with a thickness of 0.1um. This coating is very easy to recycle and reuse, and has good environmental adaptability. The resistance to O2 is 30 times higher than that of pure PET bottles, and the resistance to CO2 is 7 times higher. It can extend the shelf life of beer by six times compared with PET bottles, covering an area of about 200 mu for more than a week. The mobility of acetaldehyde in the bottle wall, which affects the taste of beverages, is reduced by 6 times. Actis20, the first commercial equipment produced by Sidel, can handle 10000 PET bottles with a maximum volume of 0.6L per hour. It is said that on the premise of meeting the barrier performance of beer bottles, its cost is lower than that of glass bottles and aluminum cans. Therefore, ACTIS technology is considered to be an ideal method for PET bottles with high barrier. While Nissin ASB develops DLC vapor deposition technology, the specific coating process is carried out according to the following steps: the bottles that complete stretch blow molding will be arranged to be sent to the coating room of hbb-8 in groups of eight at a time, and then pumped out, which can form a huge biochemical industrial gas like oil, forming a vacuum state. Use a pipe to introduce acetylene gas into the bottle through the bottleneck. 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

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