The advantages of the PP bottle in the future beverage market can not be ignored
First, the advantages of PP bottles
Since the mid-1990s, China's polypropylene production and consumption have entered the fast lane, and the output increased from 1,073,500 tons in 1995 to 5,229,500 tons in 2005. The apparent consumption increased from 2,219,200 tons to 8,233,000 tons in the same period. Become the world's fastest growing consumer of polypropylene. The fast-growing consumer market has given rise to the upsurge of industrial investment in polypropylene. It is estimated that around the year of 2008, the Chinese polypropylene industry will enter a new round of investment peak period, and nearly 6 million tons/year of production capacity will be put into operation one after another. Due to its high transparency, smoothness, and good processability, PP can be combined with other materials to make a variety of beverage packaging containers. In recent years, the application of beverage packaging has also been improved.
At present, PP bottles are mainly molded in one-step injection blow blown (ISBM) and two-step heating blown blow (SBM) molding machines. They are transparent, strong, and heat-resistant, and their prices are lower than conventional materials.
1. PP bottles can be hot-filled at 100°C. For example, fruit juices and jam products need to be packaged at this temperature, whereas ordinary PET bottles can not be filled at temperatures above the glass transition of 76°C. BOPP bottles are widely used in functional beverage packaging because they can withstand temperatures above 100°C.
2. The barrier property of PP to moisture is about 5 times that of PET. PP preform production equipment is cheaper than PET preform production equipment.
3. Compared with PET, the price of PP is 10%~30% cheaper than PET, the density of 0.9 g/cc is less than the density of PET 1.35g/cc, the quality of PP bottle is lighter than PET bottle, and PP bottle is more than PET bottle Recycling time is long, so the production cost is lower.
4. Studies have shown that the addition of a 15% ethylene/metallocene catalyst prepared from a blend of clear, silicone-free polypropylene can increase the impact strength of PP bottles from 4.7 to 7.8 ft.
Second, PP bottle defects
PP bottles are slower than PET bottles and have poor physical properties, which is the main reason why they cannot be widely used.
1. PP absorbs and disperses heat more slowly than PET. The lower rigidity of the PP means that the PP bottle has lower top load and circumferential strength than the PET bottle. In the same rigid condition, the PP bottle wall must be thicker than the equivalent PET bottle wall. Although PP has a lower processing temperature during the preform injection stage, blowing of the PP bottle needs to be done at 130°C. Therefore, not only is the energy consumption higher than PET bottles, but also the molding and cooling cycles are longer, resulting in PP's 25% lower production efficiency than PET.
2. The processing temperature of PP bottle blow molding is only 5°C. Compared with the processing temperature of PET bottle 15°C, the parking rate and reject rate are greatly increased. In order to make the transparency of PP close to PET, the technician must optimize the orientation and stretch ratio. The different stretching methods of PP bottles can easily lead to atomization of certain preform parts such as the bottom of the bottle and bottle necks.
3, PP bottles of oxygen and carbon dioxide permeability is about 30 times that of PET bottles, making it impossible to apply as widely as carbonated beverages on the barrier packaging.
Third, the development of PP bottles
PP bottles are slower to process than PET bottles and have poorer physical properties, making them not widely used. However, the ever-growing mechanical equipment, preform design, improved resins, and special auxiliaries have overcome these problems. With the successful development of the transparent modifier-nucleating agent, 0.1%-0.4% sorbitol xylylene (benzaldehyde) nucleating agent was added to the ordinary PP, through blowing, blowing, injection, extrusion Other methods can produce high transparent PP bottles. The product can be widely used as fresh juice, dairy beverages, beverage bottles and the like.
Millad 3988 anti-reflection agent has been widely used in the packaging of water, tea and fruit juices. It has the characteristics of high performance and low residual rate. It can solve the problems of atomization in the production process of PP bottle, long preform molding cycle, and blowing time. Poor processing stability and other issues. The appearance of enhanced PP bottles is the use of catalysts with a low residual rate to replace peroxide catalysts that can affect the appearance of the bottles, giving OPP bottles a high degree of transparency and high fluidity, and a good balance of rigidity and toughness. Improve the competitiveness of PP bottles in the packaging market. Basell developed a metallocene PP (mPP) for the pull-PP bottle market. The 18-MFR (melt flow rate of 18g/10min) Metocene X50182 resin has been tested on the Sidel machine, which can reduce the bottle body haze to 1.5% and increase the gloss to 82%. The mPP used by Atofina in the production of PP bottles can be blended with conventional PP to increase transparency.
PP bottles have good temperature resistance, flexible bottle design, excellent performance in terms of safety, hygiene, and taste retention of the contents, and are cheaper than materials such as PET, PS, and PE. The continuous development of modified resins, antireflection agents, and mechanical equipment technologies has enabled PP containers to replace glass, PET, and PVC containers, and has broad market prospects.
Therefore, we can predict that PP bottles will be a strong competitor for PET blown bottles in beverage packaging applications. Extrusion blow-molded PP bottles can be used to package mineral water and beverages, while stretch blow molds produce PP. The bottle is mainly used for the packaging of water, isotonic water and sports drinks. Manufacturers of PP and related product manufacturers are overcoming PP's shortcomings, and the range of applications for PP bottles in the beverage packaging market has gradually increased.
PET bottles are the mainstream of beverage packaging. At present, the leading position in China's beverage packaging materials is PET slice particles, so PET bottle blowing technology, PET hot filling, sub-hot filling technology, and the now popular PET cold aseptic filling technology.
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