In the realm of food packaging, the seamless integration of safety, functionality, and aesthetics is paramount. Tradsark’s transparent food-grade BOPP, CPP, and PET films are emerging as a driving force in revolutionizing food packaging, thanks to their exceptional properties and versatile applications.
BOPP Films: The “All-Rounder” of Packaging, Crafted by Advanced Technology
What sets Tradsark’s BOPP (Biaxially Oriented Polypropylene) films apart in food packaging lies in their precision biaxial stretching production process: Polypropylene raw materials are first melted and extruded into thick sheets, which are then stretched step-by-step using a machine-direction (MD) stretcher and a transverse-direction (TD) stretcher—typically with a longitudinal stretch ratio of 4-6 times and a transverse stretch ratio of 5-10 times. This process not only aligns polymer molecular chains highly in both longitudinal and transverse directions but also increases the film’s crystallinity to over 60%, thus endowing BOPP films with far superior strength, toughness, and stability compared to ordinary polypropylene materials.
The advantages of this process are evident in multiple dimensions:
- Enhanced Mechanical Performance: Stretched BOPP films achieve a tensile strength of 200-300 MPa, with tear resistance improved by 3-5 times. In snack packaging, they effectively withstand friction and impact during transportation and storage—for example, in potato chip bags, they ensure chips remain intact and crispy.
- Superior Transparency: The aligned molecular structure reduces light scattering, giving the film a light transmittance of over 92%, allowing the color and shape of food to be clearly visible and enhancing consumer appeal.
- Optimized Barrier Properties: The dense molecular structure controls water vapor transmission rate to an extremely low level (typically ≤5 g/m²·24h), providing a reliable moisture barrier for humidity-sensitive foods like biscuits and pastries, extending their shelf life.
Notably, their excellent oil resistance stands out: After biaxial stretching, Tradsark further enhances the film’s surface tension and chemical inertness through surface corona treatment and special coating technology. This enables BOPP films to effectively resist oil penetration. When packaging fried foods (such as French fries and fried chicken), nuts (like almonds and walnuts), or oily sauces (such as peanut butter and chocolate spread), the film maintains a clean surface for extended periods, preventing oil leakage that could cause sticking, contamination, or reduced strength—making it ideal for oily foods requiring long-term storage or long-distance transportation.
Additionally, the surface of BOPP films, optimized through advanced processes, offers exceptional printability, accurately rendering vibrant colors and intricate patterns to help brands create eye-catching packaging.
CPP Films: Flexible Packaging Experts
CPP (Cast Polypropylene) films, produced via cast extrusion, are soft and far more flexible than comparable products, making them ideal for packaging fresh and frozen foods. In meat and seafood packaging, they conform tightly to the shape of ingredients, providing comprehensive protection. Their low-temperature heat-sealing property is remarkable, with a heat-sealing range of 120-160℃, enabling quick and secure sealing without damaging food nutrition or quality due to high temperatures. This ensures tight packaging, preventing juice leakage and air ingress, thus maintaining food freshness and flavor.
CPP films also exhibit excellent oil resistance, effectively preventing oil penetration. In nut and fried food packaging, they maintain packaging integrity over time and meet food contact safety standards, ensuring consumer health.
PET Films: Ideal for High-End Packaging
PET (Polyethylene Terephthalate) films, with their comprehensive performance, hold a prominent position in high-end food packaging. Their impressive mechanical strength, with a tensile strength of 150-300 MPa, allows them to withstand significant external forces—making them safe for liquid beverage packaging by enduring internal pressure.
PET films offer excellent gas barrier properties, with low oxygen transmission rates that effectively delay food oxidation. For oxidation-sensitive foods like coffee and tea, they preserve flavor and aroma for extended periods. They also demonstrate outstanding high-temperature resistance, withstanding up to 150℃, making them suitable for high-temperature sterilized food packaging (such as canned alternatives). After high-temperature treatment, they remain dimensionally stable without deformation or rupture, ensuring reliable packaging performance. Moreover, their transparent and pure appearance, combined with a smooth surface, delivers exquisite printing results, enhancing the quality of high-end foods.
Versatile Applications for Diverse Needs
Tradsark’s three film types cover the entire spectrum of food packaging, meeting both basic preservation and specialized requirements:
- In snack foods, the combination of BOPP and CPP films provides moisture-proof, oil-resistant, fresh, and attractive packaging for potato chips and nuts.
- For fresh produce and baked goods, CPP films’ flexibility and preservability, along with PET films’ high barrier properties, extend freshness.
- In baked goods packaging, BOPP films’ stiffness and printability showcase product appeal.
- For liquid and sauce packaging, PET films’ strength and barrier properties are unmatched.
- For high-end foods, PET films’ premium characteristics elevate product image.
Strict Standards for Safety and Sustainability
Tradsark adheres to global food packaging safety standards, such as FDA and EU 10/2011. Using 100% food-grade raw materials, it eliminates harmful chemical additives. Tests by authoritative institutions show that heavy metal migration and solvent residues are far below standard limits, ensuring safety for direct food contact.
In terms of sustainability, some films are recyclable, reducing plastic waste. Through optimized production processes, film lightweighting is achieved, lowering material consumption and supporting food enterprises in their green transformation.
Choosing Tradsark’s transparent food-grade BOPP, CPP, and PET films means food enterprises gain not just high-quality packaging materials, but a comprehensive solution from packaging design to production. From free sample testing to customized film thickness, composite structures, and printing solutions, coupled with fast delivery, Tradsark’s professional services help enterprises enhance packaging competitiveness and stand out in the market.
