Forming principle
The plastic bottle is blow-molded by the filling of the gun mold under a certain temperature and pressure. It can be formed by processing the preform, or it can be directly processed by an injection-blow molding machine.
bottle development
The use of coating technology to manufacture barrier plastic bottles has shown a downward trend, and Krones AG of Germany and Tetra Pak of the United States (Tetra Pak, Illinois) have begun to reduce production scale. Krones and The Coca-Cola Company jointly developed the BestPET technology, which coats the outer surface of the bottle with a silica-containing coating. A spokesman for the company claimed that the technology was outdated due to high cost and insufficient oxygen barrier properties, and that Tetra Pak had discontinued the Glaskin silica plasma coating system applied to the inner walls of PET bottles. research work.
In addition, Italian SIPA company has developed a new barrier dipping coating material for PEN bottles, whose trade name is Smart Coat. The bottles are quickly dried in an oven, then coated a second time, and then cured under UV radiation. A standard dip-coating unit can process approximately 12,000 plastic bottles per hour. One of the application goals of this PET bottle is to fill carbonated beverages. According to the company, the 0.5-liter capacity, single-use dipped PET bottle can have a shelf life of up to one year of the packaged goods, while the undipped PET bottle has a shelf life of up to one year. The commodity shelf life of PET bottles is only 7 weeks.
British Innovative Plastics Technology (AFT) has developed a patented water-based flow coating process to coat the outer surface of a special barrier thermoplastic resin preform. After the preform is coated, the resin Curing occurs and the preform can be post-stretch blow molded on standard processing equipment. APT claims that this coating process improves CO barrier properties by 3-4 times compared to uncoated PET bottles, and Husky is negotiating with APT to transfer technology to obtain the The operating license of the coating equipment, which is designed to process 30,000 preforms per hour, said Robert, director of APT. Lee said. This technology has been purchased by a leading beverage company for processing non-alcoholic beverage bottles.
The Institute of Plastics Processing (IKV) of the University of Aachen in Germany has transferred the plasma coating technology for the inner wall of plastic bottles, PECVD, to Sidel. IKV has also developed a coating technology for the outer wall of plastic bottles, using 20- The 150nm barrier coating, similar to the inner wall coating process, can improve the CO barrier performance of PET bottles by 4 times. The processing cycle of the technical production system device is 15 seconds. The development goal set by the researchers is: the processing cycle time is shortened Within 10 seconds, apply a more powerful vacuum pump, as well as other improved detection devices.
