The use of coating technology to manufacture barrier plastic bottles has shown a downward trend. German Krones AG and Tetra Pak (Illinois) have begun to cut production. Krones Co. and Coca-Cola Co. developed the BestPET technology to coat the outside of the bottle with a coating containing silicon oxide. A spokesperson for the company claimed that due to the high cost and poor barrier properties of oxygen, this technology is out of date. Tetra Pak has also terminated the Glaskin silica plasma coating system applied to the inner wall of PET bottles. research work.
In addition, the Italian SIPA company developed a new type of barrier coating material for PEN bottles. Its trade name is Smart Coat. The process flow is: After the bottle is blow-molded, it is subjected to a dip coating process and then immediately put into the infrared. The bottles are quickly dried in an oven and coated a second time. The bottles are then cured under UV radiation. A standard coater can process approximately 12,000 plastic bottles per hour. One of the applications of this PET bottle is to fill carbonated beverages. According to the company, a 0.5-liter capacity single-use PET bottle that has been coated has a shelf life of up to one year without packaging. PET bottles have a shelf life of only 7 weeks.
AFT has developed a patented water-based flow coating process that coats the outer surface of a preform made from a special barrier thermoplastic resin. After the preform has been coated, the resin Curing occurs and preforms can be stretch blown twice in standard processing equipment. APT claims that with this coating process, the barrier performance of CO is increased by 3-4 times compared with uncoated PET bottles. Husky is negotiating with APT to transfer technology to obtain this kind of manufacturing. With the approval of the coating equipment business, the designed capacity of the equipment is to process 30,000 preforms per hour, APT company director Robert. Li said. This technology has been purchased by a leading manufacturer of beverages for processing non-alcoholic beverage bottles.
The Institute of Plastics Processing (IKV) at the University of Aachen, Germany, has transferred its PECVD plasma coating technology to the Sidel company. IKV has also developed a plastic bottle outer wall coating technology that uses 20- The 150nm barrier coating, similar to the inner wall coating process, can increase the CO barrier performance by 4 times in PET bottles. The processing cycle of the technology production system is 15 seconds. The development goals are: reduction of the processing cycle time within 10 seconds, application of a more powerful vacuum pump, and other improved detection devices.