Heat Sealing Aluminum Foil Lids Film For Yogurt Cup

The heat seal aluminum foil lid film for yogurt cups is a key component in dairy product packaging, and its performance directly affects the sealing, shelf life and user experience of the product. The heat sealing aluminum foil film for yogurt cups is a composite material, it is usually composed of multiple layers of materials with different functions, including but not limited to aluminum foil, heat-sealing layer, weak adhesive layer, etc. The main function of this sealing film is to ensure that the yogurt remains fresh during storage and transportation, and prevent the entry of external air, moisture and pollutants, thereby extending the shelf life of the product.

Material properties and selection

• Aluminum foil substrate selection

The yogurt aluminum foil lids film mostly uses 8011-O aluminum foil as the substrate. Its ductility (elongation ≥20%) and softness in the annealed state are suitable for high-frequency heat sealing processes. The thickness is usually 0.04-0.09mm, taking into account both barrier properties and easy puncture. This material has the following advantages:

– High barrier property: It can effectively isolate oxygen, moisture and light, and extend the shelf life of yogurt;

– High temperature resistance: It can withstand heat sealing temperatures of 130-150℃ to ensure sealing stability;

– Surface flatness: The degreasing process ensures that the surface is free of impurities, which is conducive to subsequent lamination or printing.

• Composite layer materials

Aluminum foil is often compounded with plastic films such as PP, PET or PE, for example:

– PP/aluminum foil composite film: It has both high temperature resistance and easy tearing, and is suitable for electromagnetic induction sealing;

– PET/aluminum foil composite film: It improves mechanical strength and is suitable for packaging scenarios that require multiple transportation.

Key performance indicators

• Physical properties

– Puncture strength: It needs to meet the requirements of easy penetration of straws but resistance to external force extrusion. The puncture force of 8011 aluminum foil is usually 2-4N;

– Pressure resistance: It needs to withstand a pressure of ≥50kg/m² without deformation during stacking and transportation.

• Chemical stability

– Acid and alkali resistance: The pH value of yogurt (4.0-4.6) requires that the surface coating of the aluminum foil is corrosion-resistant and avoids metal ion migration;

– Food safety: It complies with the GB 4806.9-2016 food contact material standard, and the migration of heavy metals is less than 0.01mg/kg.

Testing and quality control

In order to ensure the quality of the yogurt cup sealing cover film, companies will use equipment such as the XLW-H intelligent electronic tensile testing machine to test the sealing strength or heat sealing strength to ensure that the seal is both firm and easy for consumers to open. At the same time, attention will also be paid to the peel strength test of the sealing film to ensure that the product will not leak or deteriorate due to sealing problems during transportation and sales.

When choosing the heat sealing aluminum foil lid film for yogurt cups, it is necessary to comprehensively evaluate the barrier performance, sealing strength and cost-effectiveness. For high-end products, the 8011-O aluminum foil + PP composite solution is recommended, focusing on sealing and user experience; while short-shelf-life products can use PE substrates to reduce costs.