Biaxially oriented polypropylene (ie, BOPP) is a film-making material that is used to pack food, cigarettes, clothing, and films on books and laminates on books, using BOPP film. The advantages of this thin film material are transparency, certain barrier properties, stiffness, high strength, and non-toxicity. At present, bottles made of BOPP materials have been available. At the same time, such BOPP bottles have also been used in the beverage industry. At present, PET bottles are mostly used in the beverage hot filling market. PET material has good gas barrier property and chemical stability, and has good toughness. Its high tensile strength, transparency, and good gloss, but easy to absorb moisture, so PET bottles need to be dried by special equipment before processing. deal with. Ordinary PET bottles are not resistant to high temperatures and cannot be used for fruit juice and tea beverage packaging. The typical way to change the performance is to increase the crystallinity, adding a heat-setting process to the bottle, and the preform production process must change, mainly the bottle mouth. Crystallization, PET bottles can withstand temperatures from 85°C to 95°C as crystallinity increases. BOPP hot filling bottles are still unfamiliar to most people. However, its availability has made it possible for enterprises that need hot-filling bottles, such as fruit juices and tea drinks, to have new choices in packaging. Polypropylene material has low price, good stability and transparency, does not absorb moisture, and has good temperature resistance. The disadvantage is that the gloss and barrier properties are not as good as PET material, but the barrier property and temperature resistance of the polypropylene bottle can be improved by biaxial stretching. Sex.
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BOPP Packaging Technology Brings Greater Flexibility to Production
BOPP bottle can have a great attraction for beverage companies, mainly because of its low cost. BOPP bottles are at least 20% cheaper than PET bottles. Using BOPP bottles means huge profit margins. In addition, its temperature resistance is good. At present, PET hot-filled bottles are only resistant to high temperatures of 93°C, but BOPP bottles can withstand high temperatures of 100°C, which makes the hot-filling process of beverage plants a breeze. Due to the poor temperature resistance of PET bottles, it is necessary to adopt a reasonable bottle design to suit the temperature and pressure during filling. Special bottles are required at the bottom and the bottom of the bottles. Therefore, hot filled beverages such as tea and fruit juices are packed on the market. The bottle shape of PET is similar, and BOPP bottle has a good temperature resistance performance, and the bottle design requirements are not harsh. Bottle type design can be very flexible.
The most important point is that BOPP bottles do not absorb moisture, which is of practical significance to beverage and bottle manufacturing companies. The beverages are often in season. In general, companies produce bottles for storage in the off-season for peak seasons, which can reduce equipment investment and increase equipment utilization. However, due to the moisture absorption of PET bottles, the crystallinity is lowered, and the temperature resistance of the bottles is damaged. The maximum storage time is 14 days. This leads to the shortage of PET bottles production equipment in the off-season and the short supply in the peak season. The BOPP bottle can be stored for several years and the temperature resistance performance is unchanged, which equals to increase the equipment utilization rate.
BOPP bottle manufacturing process and equipment characteristics
BOPP blow-drying bottle generally adopts two-step preheating biaxial stretch blow-molding system. According to the characteristics and application requirements of BOPP bottle, the main process flow is: After PP embryonic material is injection-molded, it is cooled for about 24 hours. The preforms are sent to the accompanying jigs via the upper embryonic delivery system. They are sent to the host heating and temperature control system by the accompanying jig and heated. Finally, the preforms are blown into a BOPP bottle.
Here's an example of BOPP blow molding machine of Dongguan Jiahong Machinery Manufacturing Co., Ltd., to introduce you to the main performance characteristics of BOPP bottle blowing equipment:
1. Intelligent electronic control system, with double closed loop of temperature and voltage, automatic control for fluctuations of the ambient temperature and input voltage, so that the preform is heated stably and the heating is more balanced.
2. Reserve the Ethernet interface so that the machine can realize the central monitoring operation status through the network and the remote diagnosis operation is faulty.
3. The distance between the machine's accompanying clamps is moderate, the machine runs smoothly and reliably, and the bottle is well formed.
4. Optimized control of the program. When there are no preforms, the molds and robots do not move, reducing machine wear and reducing air consumption.
5, advanced bottom mold structure, special bottle preform guide device, so that the bottle bottom molding more centering, the bottle wall is more uniform.
6. The bottle-handling robot is arranged separately when the embryo is sent, the machine action is more flexible, the operation is more stable, and the blowing cycle is shortened.
7, the whole machine fully automated control, PLC microcomputer signal processing, touch screen man-machine interface, simple operation, convenient and superior performance.
8, choose a first-class suppliers, such as pneumatic components, mainly with FESTO products, the main electrical components from Omron, Fujitsu, so that the entire machine performance and long service life.
10. High-precision pressure regulating modular temperature control system, precise control of the heating temperature of the preform, precise temperature signal feedback system, can improve the bottle molding rate, reduce material and energy consumption.
11. Multi-point emergency stop control to ensure timely shutdown in the event of a fault, to ensure the safety of the equipment, and to monitor the machine's operating position. When the operation is not in place or in the event of a fault, it can be immediately alarmed and automatically shut down for inspection. The PLC monitors the operating status at any time, can self-diagnose the point of failure of the equipment and indicate the cause of the failure.
12. The number of bottle embryos can be automatically detected by the preform conveying, row-embryo, and embryo-implanting devices, and the automatic switching of actions can be started or stopped to reduce energy consumption.
13, far infrared heating, save energy, reduce costs.
14, dense stainless steel accompanying jig transmission, no dust adsorption, import chain drive, only a few times a year lubrication.
15, pneumatic transmission mechanical arm, accurately transmitted to the preform, the structure is simple, reliable performance.
16, hinged mold clamping device, high-pressure pneumatic mold clamping structure, so that the bottle is not front-facing, small parting line.
17,Adjustable sealing and stretching system, according to the height of the bottle can be adjusted steplessly, double linear guide guide, accurate positioning and stretching, so that the bottle wall thickness is uniform.
18, all stainless steel protective cover, beautiful appearance, clean, stable and reliable, low noise, low vibration. 