BOPE film, full name is biaxially oriented polyethylene film. It is a type of polyethylene film produced through a special biaxial stretching process. This process significantly improves the performance of traditional polyethylene (PE) films, making it a high-performance packaging material that combines features such as high strength, high transparency, high moisture resistance, easy thinning, and easy recycling.
It is not only an ideal substitute for traditional PE films but also a key material for driving the development of flexible packaging towards higher performance, lighter weight, and sustainability. It is playing an increasingly important role in the global packaging industry.
The performance advantages of BOPE film are the fundamental reason for its rapid development.
1. Excellent mechanical properties
High strength: The tensile strength is 2-5 times that of traditional PE film, extremely tough, with excellent puncture and impact resistance.
High stiffness: The film feels more "rigid", which is conducive to stable operation on high-speed packaging machines, reducing jams and improving packaging efficiency.
Excellent tear resistance (especially at right angles): The packaging bag is less likely to tear due to accidental bumps, ensuring transportation safety.
2. Outstanding optical properties
High transparency: BOPE film is as clear as glass, allowing the appearance of the contents to be fully displayed, enhancing the product display effect.
Low haze: Higher light transmittance, better visual effect.
3. Excellent water vapor barrier properties
Its dense microstructure gives it superior water vapor barrier ability compared to traditional PE film, effectively preventing the contents from getting damp or drying, and extending the shelf life.
4. Potential for thinning (lightweighting)
Due to extremely high strength, under the premise of meeting the same packaging performance requirements, BOPE film can be made thinner than traditional PE film (usually 20%-50% thinner). This directly brings two benefits:
Saving raw materials and reducing costs: The amount of film per unit area is reduced.
Environmental protection and sustainable development: Reduces the use of plastic, conforms to the "reduction" environmental trend, and is easier to recycle.
5. Good post-processing performance
After surface corona treatment, it has excellent printing adaptability, with clear and beautiful patterns.
The bonding strength with other materials (such as CPP, BOPP, aluminum foil, PET, etc.) is high, enabling the manufacture of high-performance composite packaging materials.
BOPP (biaxially oriented polypropylene) is the most widely used biaxially oriented film. Compared with BOPE, they each have their own advantages:
Properties | BOPE (Biaxially Oriented Polyethylene) | BOPP (Biaxially Oriented Polypropylene) |
Strength and toughness | Excellent, with good impact resistance and puncture resistance | Good, but with relatively high brittleness |
Rigidity | High | Extremely high, providing a firmer feel |
Water vapor barrier | Excellent water vapor barrier | Excellent water vapor barrier, but oxygen barrier performance is average |
Heat sealing performance | Excellent, with a wide heat sealing temperature range and high strength | Requires coating for heat sealing, or the heat sealing performance is poor |
Transparency | Extremely high | Extremely high |
Sustainability | Recyclable from the base material (belongs to the PE family) | Recyclable from the base material (belongs to the PP family) |
Key difference: The high toughness and direct heat sealing property of BOPE are its core advantages compared to BOPP. BOPP usually needs to be combined with CPP (extruded polypropylene) to achieve heat sealing for bag production, while BOPE can be sealed directly on its own, which makes it possible to simplify the packaging structure (single-material packaging).
Product Name | BOPE25 | |||
Testing item | Unit | Typical Value | Test Method | |
Thickness | μm | 25μm | / | |
Average Thickness | μm | ±1μm | GB/T 6672 | |
Tensile Strength | MD | MPa | ≥60 | ASTM D882 |
TD | ≥120 | |||
Tensile Elongation | MD | % | ≤300 | ASTM D882 |
TD | ≤150 | |||
Heat Shrinkage | MD | % | ≤9.0 | ASTM D1204 |
TD | ≤7.0 | 100℃/2min | ||
C.O.F | μs | - | ≤0.5 | ASTM D1894 |
Out side/Out side | μd | ≤0.5 | ||
Gloss 60° | % | ≥70 | ASTM D2457 | |
Haze | % | ≤8.0 | ASTM D1003 | |
Dart impact Strength | g | ≥250 | ASTM D1709 | |
Surface Tension | Corona | mN/m | ≥38 | ASTM D2578 |
Out side | ≤32 | |||
