8011 aluminum foil and 8079 aluminum foil used for yogurt cover foil
As a dairy product consumed by the public on a daily basis, the sealing of yogurt packaging is directly related to the shelf life and food safety of the product. Among them, the silver cover foil on the top of the cup yogurt plays a key role in blocking oxygen and light and ensuring sealing. So, which alloy is more suitable for yogurt cover foil? This article will analyze the performance differences and selection basis of 8011 aluminum foil and 8079 aluminum foil for you in combination with industry applications and material properties.
1. Core performance requirements of yogurt cover foil
Yogurt has complex ingredients and is rich in protein and fat. It is easily affected by the following factors:
Oxygen permeation: accelerates oxidation and deterioration, leading to flavor changes;
Light exposure: destroys nutrients and causes flavor deterioration;
Microbial contamination: insufficient sealing and easy to breed bacteria;
Mechanical external force: needs to withstand extrusion during transportation.
Therefore, yogurt cover foil needs to have three core properties: high barrier properties, excellent heat sealing properties, and good mechanical strength.
2. Comparison of mainstream alloy types: 8011 aluminum foil vs 8079 aluminum foil
1. 8011 aluminum foil
Alloy composition: Al-Fe-Si system, iron-silicon content exceeds 1%, forming a strengthening phase to improve mechanical properties.
Material state: usually O state (annealed state), excellent ductility, easy to stamp and form.
Key performance:
Barrier property: extremely low permeability to oxygen and water vapor, effectively extending the shelf life;
Heat sealability: tightly bonded to PE/EVA layer at high temperature of 121℃-125℃ to ensure sealing reliability;
Mechanical strength: strong puncture and tear resistance, taking into account the design requirements of easy tearing;
Surface quality: porosity <0.5%, degreasing cleanliness reaches food grade standards.
2. 8079 aluminum foil
Alloy composition: Al-Fe-Si system, similar to 8011 but with different trace element ratios.
Material state: O state or H22/H24 state, slightly higher strength than 8011.
Performance characteristics:
Heat sealing: specially optimized for heat sealing process, with higher sealing flatness;
Corrosion resistance: more adaptable to acidic contents (such as fruity yogurt);
Processability: suitable for deep stamping of complex cup lids.
3. How to choose a suitable alloy?
Conventional yogurt packaging: 8011-O aluminum foil is preferred. It has balanced comprehensive performance, moderate cost, meets the needs of high-temperature steaming and sterilization, and complies with GB 4806.9-2016 food contact material standards.
Functional yogurt: If it contains fruit particles or needs to strengthen the sealing, 8079 aluminum foil can be used. Its higher mechanical strength can prevent fruit particles from puncturing, which is suitable for high-end product lines.
Environmental protection and cost considerations: Both alloys can be recycled and reused, and 8011 has a more advantageous material cost due to its wide market application.
IV. Industry application trends
Material thinning: By optimizing the alloy ratio, 0.04-0.06mm ultra-thin aluminum foil has been applied on a large scale, reducing material costs;
Composite structure upgrade: PET/AL/PE-EVA three-layer composite structure has become the mainstream, taking into account both barrier properties and heat sealing properties;
Sustainable direction: Some brands have introduced aluminum foil recycling plans to promote the recycling of packaging materials.
Conclusion
The alloy selection of yogurt cover foil needs to comprehensively consider product characteristics, process adaptability and cost control. 8011 aluminum foil is still the mainstream choice in the industry with its mature process and balanced performance; while 8079 aluminum foil provides solutions for high-end differentiated needs. In the future, with the continuous advancement of material science and packaging technology, yogurt cover foil may continue to evolve in the direction of thinner, stronger and more environmentally friendly.
