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中文简体1. Material reduction
Film lightweighting is a direct way to reduce the amount of plastic used, that is, to reduce the thickness of the film without affecting the packaging performance. The thickness of traditional frozen packaging film is usually 70-100μm, but by optimizing materials and manufacturing processes, it can be reduced to 40-60μm, or even thinner.
(1) Advantages of lightweight film
Reduce raw material consumption: reduce the use of plastic and reduce the demand for petroleum-based materials.
Reduce carbon emissions: lighter packaging materials can reduce energy consumption during production and transportation.
Improve recyclability: a relatively simple material structure helps improve recyclability and reduce the separation difficulties caused by mixed plastics.
(2) Methods for achieving film lightweighting
Application of high-performance materials: use high-strength materials such as linear low-density polyethylene (LLDPE), high-density polyethylene (HDPE), copolymer polypropylene (CPP) to improve toughness and tear resistance, making the film thinner while still maintaining good performance.
Multi-layer co-extrusion technology: Utilize the synergistic effect of different materials to reduce the thickness of a single layer of material and maintain barrier properties and mechanical strength.
Nano-enhancement technology: Add nanomaterials to the plastic matrix to improve cold resistance and impact resistance, so that the film can still maintain good flexibility and strength below -40°C.
2.Easy-to-Separate Design
Most frozen packaging films use multi-layer composite materials. Due to the combination of different materials, traditional recycling processes are difficult to separate and process. Designing an easy-to-peel structure can improve the separation efficiency of materials during the recycling process and enhance overall recyclability.
(1) Advantages of easy-to-peel structures
Improve recycling efficiency: Make different layers of materials easier to separate during the sorting and recycling stages, and increase recycling and reuse rates.
Reduce chemical treatment: Avoid using complex solvents or pyrolysis processes to decompose materials and reduce environmental burden.
Meet global recycling standards: Meet EU COTREP standards and APR guidelines to improve market recognition.
(2) Methods for achieving easy-to-peel structures
Using a hot melt layer (Peelable Adhesive Layer): Adding a specific hot melt adhesive layer between different layers allows the layers to be separated at a specific temperature.
Physical Peel-off Coating: Adding a peeling aid to the surface of the material makes the composite layer easier to peel during the recycling process.
Improving material compatibility: Selecting the same or similar polymer materials, such as PE/EVOH/PE structure, makes the material easier to be recycled and reused during the recycling process.
3. Compostable Multilayer Films
In the pursuit of degradable packaging, compostable composite films have become an important solution. Traditional freezer packaging films are usually made of non-degradable plastics, while new compostable packaging films can be degraded into carbon dioxide, water and biomass under appropriate conditions, reducing plastic pollution.
(1) Advantages of compostable composite films
Reduce plastic waste: Compostable films can be completely degraded in industrial or household environments and will not cause long-term pollution.
Replacement of traditional plastic film: New bio-based materials can provide barrier and mechanical properties similar to traditional plastics.
Compliance with environmental regulations: Meet environmental certifications such as OK Compost (TÜV Austria), BPI (US Compostable Product Certification), and EU EN 13432, helping the brand's environmental image.
(2) Methods for achieving compostable composite film
Using PLA (polylactic acid) substrate: PLA is derived from plant starch and has good biodegradability, but its low-temperature resistance is limited and it is suitable for short-term frozen packaging.
PBAT/PBS blending modification: PBAT (polybutylene adipate-terephthalate) and PBS (polybutylene succinate) can improve the flexibility and low-temperature resistance of PLA, making compostable film more suitable for frozen environments.
Bio-based PE replaces traditional PE: Bio-based PE comes from sugarcane or other plant sources. Although it is not completely degradable, it can reduce carbon emissions and is suitable for brands that want to reduce their carbon footprint.
4. Future development trend of sustainable packaging structure
In the future, the sustainable development of Frozen Packaging Film will rely more on the promotion of environmental protection regulations, changes in market demand and the development of new technologies. The following trends are worth noting:
Mono-material becomes the mainstream: With the optimization of the recycling system, packaging films may use more single materials in the future, such as 100% PE or PP, to improve the recycling rate.
High-performance bio-based materials: New bio-based plastics, such as PEF (polyethylene furandicarboxylate), are under research and may replace traditional petroleum-based plastics in the future.
Functional degradable packaging: In the future, degradable packaging will not only focus on environmental protection, but also improve barrier properties, moisture resistance and other functions to meet the storage needs of frozen foods.
Smart packaging combined with sustainable design: such as degradable smart labels, oxygen or humidity sensing packaging, will play a greater role in the future frozen packaging market.
