PET Bottle and BOPP Bottle Packaging Technology Analysis

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.

BOPP Packaging Technology Brings Greater Flexibility to Production

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.

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.