OPP is oriented polypropylene, which is slightly inferior to PET in rigidity, transparency, barrier properties and processability. PET is a milky white or light yellow highly crystalline polymer with a smooth and shiny surface. It is resistant to creep, fatigue and friction. It has low abrasion and high hardness. It has the highest toughness in thermoplastics. It has good electrical insulation properties and is less affected by temperature, but it has poor corona resistance. Non-toxic, weather-resistant, chemical-resistant, and hygroscopic, and drying before molding is a must. It is resistant to weak acids and organic solvents, but it is not soaked in heat-resistant water and is not resistant to alkali. OPP is cheaper than PET and has good heat resistance, so OPP has great application prospects in food and non-food packaging.
Analysis of the difference between OPP and PET plastic bottles
Analysis of the difference between OPP and PET plastic bottles
Output rate: lower than PET, but with the development of resin with the development of anti-reflecting agents and mechanical equipment, OPP plastic containers can replace glass, PET and PVC containers.
Scope of application: bottled water, juice, hot canned food, dry powder and personal hygiene products. They are molded in a one-step injection and two-step heating stretch blow molding machine, which is transparent and strong.
Density: The density of PET plastic bottles is 1.35 g/cc, and the density of antireflective PP random copolymers used for oriented polypropylene is about 0.910 g/cc. Compared with glass bottles, OPP bottles are light, non-fragile, and easy to ship. advantage. And their "actual transparency" is the same as PET plastic bottles.
Disadvantages of PP: PP is harder to absorb and dissipate heat than PET; the processing temperature for OPP stretch blow molding is narrower, only 5 degrees, while PET is 15 degrees, which increases the probability of parking and producing waste; OPP The low rigidity means that the OPP bottle has lower top load and weekly strength than the PET plastic bottle; the oxygen and carbon dioxide permeability of the OPP bottle is about 30 times that of the PET bottle, making it impossible to become a carbonated beverage. A cloudy, barrier container unless coated or co-injected with a barrier resin.
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