OPP material: The material is the most brittle, the highest transparency, tension is not enough, but the most explosive mouth. And printing is the most easy to decolorize.
OPP is polypropylene.
OPP main products:
OPP tape: With polypropylene film as the base material, it has the advantages of high tensile strength, light weight, non-toxic and tasteless, environmental protection, and wide range of applications.
OPP bottle: light weight, low cost, improved transparency, good heat resistance, suitable for hot filling. In recent years, two-way polypropylene (OPP) transparent bottles have become the preferred choice for PET bottles.
The disadvantages of PP are:
1. PP is harder to absorb and disperse heat than PET, and the wall thickness of the OPP preform is thicker (in order to achieve the same rigidity, the OPP bottle needs to be thicker than the equivalent PET bottle wall). Therefore, although PP has a lower processing temperature during the preform injection stage (230°C), the blow molding of OPP bottles needs to be done at 130°C. Not only is the energy consumption higher than PET bottles, but the molding and cooling cycles are also Longer, the OPP yield is 25% lower than PET.
2. The processing temperature for OPP stretch blow moulding is narrow, only 5 °C, while PET is 15 °C, which increases the chance of stopping and producing waste products. In addition, the method of stretching OPP is also different. This is because certain parts of the preform, such as the bottom of the bottle and the bottleneck, may be less oriented than the bottle and are more likely to cause fogging. Therefore, in order to make OPP transparent to PET, designers of preforms and OPP bottles must optimize the orientation and draw ratio.
3. The low rigidity of the OPP means that the OPP bottle has lower top load and circumferential strength than the PET bottle. In order to achieve the same rigidity, OPP bottles need to be thicker than the equivalent PET bottles.
4. The oxygen and carbon dioxide permeability of the OPP bottle is about 30 times that of the PET bottle, making it impossible to be a barrier vessel that needs to block CO2 in carbonated beverages unless the coating is co-injected with the barrier resin.
At present, many companies have improved some of the inadequacies of OPP bottles through the research and development of PP.
OPP bottle advantages
Canada’s Container Corp. (CCC) is one of the few companies in North America that produces OPP bottles. The company’s CEO, Norman
Mr. Gottlieb said that the comprehensive cost and environmental advantages prompted CCC to enter the OPP bottle market several years ago. He described CCC's EnviroClear bottle as a "single polymer" packaged product. The OPP bottle, PP bottle cap, and PP sleeve tag all use recycled PP materials. Gottlieb also said that standard PP caps can effectively mask the atomization defects of the OPP bottleneck. In addition, CCC also studied the moisture barrier, processability, and hot-fillability of OPP bottles. They used 250kg, 500cc, and 600cc OPP beverage bottles for general-purpose preforms for dry powder packaging (requiring vapor barriers such as low-temperature deposits) and hot-filled foods (prices were 35% lower than heat-resistant PET bottles). about).
The OPP bottle has excellent heat resistance and can withstand temperatures of 205°C during hot filling. Non-heat-resistant PET bottles can only withstand temperatures of 160°C to 170°C during hot filling. In addition, PET bottles also require the use of vacuum trays to prevent collapse when the hot-filling temperature exceeds 180°C. When the bottle wall is thickened, the production rate is slowed, resulting in a 20% increase in production costs.
Single-layer OPP bottles can be used in a variety of hot-filled food markets, especially when hot filling temperatures are high (180°C to 205°C), resulting in juices, jams, pectins, pickled products, and sauces. The barrier and non-barrier packaging of foods such as juice and ketchup opened up the market.
OPP bottles are cheap. PET and OPP bottles need to increase the gas barrier layer. Although the cost of barrier materials used in PET bottles and OPP bottles is basically the same, the price advantage of OPP bottles themselves makes them more attractive in the market of gas barrier plastic bottles.
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