In the yogurt and dairy packaging industry, the sealing performance of cup products is directly related to food safety, shelf life, and consumer experience. As one of the most mature and widely used sealing materials, 8011 O temper aluminum foil has become the mainstream choice for sealing PET / PE yogurt cups, thanks to its excellent ductility, stable heat-sealing performance, and outstanding barrier properties.

Understanding 8011 O Temper Aluminum Foil

8011 aluminum alloy belongs to the aluminum–iron-silicon alloy series. By strictly controlling the content of elements such as copper and manganese, it achieves excellent formability, corrosion resistance, and food safety performance. After special processing, the foil surface is smooth, oil-free, and fully compliant with strict standards for direct food contact.

O temper represents a fully annealed condition. After high-temperature annealing, the internal crystal structure becomes soft, giving the aluminum foil outstanding ductility, flexibility, and stamping performance. This allows it to perfectly adapt to high-speed lidding machines and form a tight, reliable seal.

PET/PE plastic cups are widely used in yogurt packaging due to their transparency, lightweight nature, moderate cost, and good printability. However, plastic materials themselves have limited resistance to oxygen and light. When used as a sealing material, 8011 O temper aluminum foil effectively compensates for these shortcomings, forming a strong and reliable "composite barrier."

Core Requirements of PET / PE Yogurt Cups for Sealing Materials

In practical applications, PET / PE yogurt cups place multiple requirements on sealing aluminum foil:

• Good heat-sealing performance
  Ensures firm sealing with no air leakage or liquid seepage.

• Stable peel strength
  Prevents detachment during transportation while remaining easy for consumers to open.

• Excellent barrier properties
  Blocks oxygen, moisture, and odors, extending the shelf life of yogurt.

• Food-contact safety
  Materials must meet food-grade standards with no migration risk.

Technical Parameters of Aluminum Foil for Yogurt Lids

Heat-Sealing Performance Parameters

Key Advantages of 8011 O Temper Aluminum Foil for Sealing PET / PE Yogurt Cups

1. Excellent Heat-Sealing Performance

The soft O temper 8011 aluminum foil fully conforms to the rim of the cup during heat sealing, effectively compensating for minor dimensional tolerances and reducing the risk of weak or leaking seals.

2. Outstanding Barrier Properties

8011 aluminum foil provides nearly 100% barrier protection, effectively blocking oxygen, light, and moisture. This prevents fat oxidation and protein deterioration, thereby extending yogurt shelf life.

3. Perfect Easy-Peel Performance

Through precise coating control and embossing technology, 8011 aluminum foil lids deliver a smooth and effortless peel-open experience with clean tear edges, greatly enhancing consumer convenience.

4. Excellent Decorative Appearance

With a smooth surface and strong metallic texture, aluminum foil supports high-definition, vivid color printing, enhancing the premium appearance of packaged products.

5. Suitable for High-Speed Filling and Mass Production

The stable mechanical properties of 8011 O temper aluminum foil make it ideal for high-speed die-cutting, lid forming, and automatic sealing equipment, reducing production issues such as foil breakage and wrinkling-perfect for large-scale dairy production.

6. Safe and Non-Toxic

8011 aluminum foil complies with both national and international food contact material standards. Its stable chemical properties ensure no reaction with yogurt, guaranteeing product safety.

7. Recyclable and Environmentally Friendly

Aluminum foil is 100% recyclable, aligning with sustainability trends and helping reduce packaging waste.

Main Application Products

8011 O temper aluminum foil sealing lids are widely used for:

• Cup yogurt

• Fermented milk

• Probiotic beverages

• Cream, pudding, and dessert cups

• Other PET / PE food cup sealing applications

Processing Advantages of MC Aluminum's 8011 O Temper Aluminum Foil

High surface flatness: Ideal for high-quality multi-color printing, enhancing product value.

Low pinhole rate: Uniform iron distribution in the 8011 alloy ensures excellent sealing performance even at reduced thicknesses (such as 0.03-0.05 mm).

Excellent elongation: O temper aluminum foil withstands frequent mechanical stretching on high-speed cup filling and sealing machines without brittleness or cracking.