The hottest two-stage stretch blow molding process

The two-stage stretch blow molding process has sprung up

a major feature of today's international beverage packaging industry is the wide variety of materials and the continuous innovation of technology. At present, a new breakthrough has been achieved in the production process of packaging materials, that is, the preparation of polyethylene terephthalate (PET) beverage cups through a two-stage stretch blow molding process

compared with PET beverage cups of thermal molding and injection molding, PET beverage cups of stretch blow molding have the advantages of high strength, high barrier, good transparency and no debris due to the unique directional effect of stretch blow molding process. Therefore, in general, the production cost of stretch blow molding is 30% lower than that of thermoforming or injection molding. In the thermoforming process, the proportion of debris produced may be as high as 50% of the total raw materials. Compared with the beverage cup produced by thermoforming process, the barrier performance of the stretch blow molded beverage cup is improved by 17%

the process was developed by fron tier company in Ueda, Japan, and was made public at the international plastic and Rubber Exhibition held in Tokyo not long ago. The key of the two-stage stretch blow molding process is to design and optimize the operation of 10 heating zones on the frc-12 reheat stretch blow molding machine. Frc-12 has 12 blow mold grooves, and the number of these blow mold grooves depends on the operating condition of the machine and the shape of the blow molded beverage cup. You can add up to 240 blow molding slots according to actual needs. At present, the first frc-12 device has been put into commercial production in Xiyou company, a Japanese packaging material manufacturer. The pet cup produced by its blow molding has been used and sold in coffee shops and stores in Japan. The 32 mold slot injection machine manufactured by Sumitomo is used to produce pet drink cups. The extruder adopts an electric pressing plate and hydraulic injection at the end. An injection cycle is 9.5 seconds

the mechanical strength of beverage packaging materials is particularly important because the packaged beverage is full. Under the condition of the same quality of the beverage cup, the beverage cup produced by two-stage stretch blow molding process bears 40% more top pressure than that produced by one-stage stretch process or thermoforming process. In addition, the orientation degree of the beverage cup prepared by the two-stage stretch blow molding process is about 64%, while the orientation degree of the beverage cup prepared by the one-stage stretch blow molding process is relatively low, which is 53%

due to the unstable cooling of the mold of the one-stage stretch drying adhesive joint blow molding machine, the scrap rate of the beverage cup production is usually 20% - 30%, while the scrap rate of the two-stage stretch blow molding machine is only about 1%; The maximum elongation of the beverage cup produced by the first stage machine is only 2.2, while the elongation of the beverage cup produced by the two-stage machine is 3.2; The thickness of the cup wall produced by one-stage stretch blow molding process is easy to crack at the outlet, and the thickness of the cup body and the cup wall is uneven. However, the two-stage stretch blow molding process can ensure that the thickness change of the cup wall of the produced beverage cup is not more than 0.06mm, and the diameter change of the cup mouth is about 0.01mm

reducing the fluctuation range of the thickness of the drink cup wall has an important impact on the printing of the cup body. More and more beverage manufacturers and distributors hope to attract the attention of consumers through labels in order to enhance the competitiveness of their products. Beverage label 2. Impact energy: 1J 2.75j 5.5j 11j 22j requires to maintain a good appearance after pasting, disinfection, freezing and other steps. The beverage cup produced by the two-stage stretch blow molding process has good printing performance, taking into account its dual requirements for beautiful labels and firm adhesion

frc-12 rotary reheat stretch blow molding machine can also be used to produce packages of fruits, milk based beverages, yogurt and milk, as well as stretch blow molding multi-layer containers. The development field of frc-12 also includes stretch blow molded single-layer polypropylene beverage cups. The transparency of polypropylene beverage cup produced by this process is improved, and its transparency is close to that of PET beverage cup

the size of beverage cups produced by the two-stage stretch blow molding process is also developing. At present, the use of nano calcium carbonate in different shapes of fron tier company is different, and it can produce beverage cups with a volume of 100 ~ 600ml. Because the two-stage drawing process can produce most of the sizes of products that can be produced by thermoforming and injection molding processes, and has excellent performance, it may become the main production process of plastic containers in the future

source: Thunderbird International Group Co., Ltd