BOPP film (Biaxially Oriented Polypropylene film) is a plastic film made from polypropylene material stretched in two perpendicular directions through a special process. This manufacturing process significantly enhances the mechanical strength and barrier properties of the material, making it one of the core materials in the modern packaging industry.
Compared to traditional packaging materials, BOPP film has clear advantages:
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Compared to PE film: higher stiffness and transparency
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Compared to PET film: lower cost and better heat sealing properties
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Compared to paper: excellent moisture resistance and longer service life
In the field of sustainable packaging, BOPP film is becoming an important component of eco-friendly packaging solutions due to its 100% recyclability. According to the latest industry data, the global BOPP film market size is expected to reach 24 billion US dollars by 2025, with a compound annual growth rate of 5.7%.
BOPP Film Manufacturing Process
The production process of BOPP film involves several precisely controlled stages:
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Raw Material Preparation Food-grade polypropylene (PP) pellets are used as the base material, with a melting point of approximately 160-170°C.
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Extrusion Forming The initial film is formed through a T-die extrusion process, with thickness control accuracy up to ±1 micron.
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Biaxial Orientation
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Longitudinal stretching (MD): 3-5 times stretching ratio, temperature 135-145°C
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Transverse stretching (TD): 8-10 times stretching ratio, temperature 155-165°C
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Post-processing Operations
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| Processing Type |
Function |
Technical Parameters |
| Corona Treatment |
Increase surface tension |
38-42 dynes/cm |
| Coating Treatment |
Enhance barrier properties |
Coating thickness 0.5-2μm |
| Metallization |
Improve light barrier properties |
Aluminum layer thickness 30-50nm |
This precision manufacturing process allows the thickness tolerance of BOPP film to be controlled within ±3%, far exceeding the industry standard of ±10% for ordinary plastic films.
Key Characteristics of BOPP Film
Physical Performance Advantages
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Optical Properties: Light transmittance >92%, haze <1.5%, transparency comparable to glass
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Mechanical Strength: Tensile strength can reach above 200MPa, 5-8 times stronger than unstretched PP film
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Thermal Properties: Vicat softening point ≥150°C, suitable for environments from -40°C to 120°C
Functional Features
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Barrier Properties
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Surface Characteristics
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Surface resistivity: 10¹³-10¹⁵Ω (can be reduced to 10⁸Ω through treatment)
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Printability: Supports various printing methods such as gravure, flexography, and digital printing
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Environmental Adaptability Certified by FDA, EU and other food contact material standards, meets RoHS environmental requirements
Common Applications of BOPP Film
Food Packaging Field
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Puffed food: Utilizes high barrier properties to maintain crispness
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Frozen food: Maintains flexibility even at -40°C
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Candy packaging: High transparency enhances product display effect
Industrial Packaging Applications
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Label Materials Accounts for 35% of the global label material market, with an annual growth rate of 6.2%
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Composite Packaging Often laminated with CPP, PE and other materials to form multi-layer barrier structures
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Specialty Packaging
Emerging Application Scenarios
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E-commerce packaging: Lightweight characteristics reduce logistics costs
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Pharmaceutical packaging: Meets USP Class VI medical standards
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Flower packaging: High light transmittance enhances bouquet display effect
Market Advantages of BOPP Film
Economic Comparison
Environmental Benefits
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Can be recycled 5-7 times while maintaining performance
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Carbon footprint 15-20% lower than PE film
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Energy consumption reduced by 30% during recycling and remanufacturing
Future Development Trends
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Material Innovation
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Process Breakthroughs
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Application Expansion
Conclusion and Recommendations
As a core material in modern packaging, BOPP film's outstanding performance and continuous technological innovation ensure its leading market position. For packaging professionals, we recommend:
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