How is the sealing performance of aluminum foil for blister packaging in blister packaging?
Publish Time: 2025-03-25
Blister packaging, as a packaging form widely used in the fields of medicines, food and health products, has a unique structural design that not only achieves effective isolation and protection of products, but also improves the convenience of carrying and taking. In blister packaging, aluminum foil is a key sealing material, and its sealing performance is directly related to the overall protection effect of the packaging and the shelf life of the product.
Aluminum foil for blister packaging is usually made of electrolytic aluminum with a purity of up to 99% through precision rolling, and has a highly dense metal crystal structure. This feature gives aluminum foil excellent moisture resistance, gas barrier and taste retention, making it an indispensable part of blister packaging. In the production process of blister packaging, aluminum foil is closely combined with blister substrates (such as hard sheets such as polyvinyl chloride and polyvinylidene chloride) through heat sealing technology to form a solid barrier, which effectively isolates harmful factors such as moisture, oxygen, and light from the outside world, thereby protecting the products in the package from contamination and deterioration.
The sealing performance of aluminum foil is mainly reflected in its heat sealing strength and sealing integrity. Heat sealing strength refers to the bonding force formed between the aluminum foil and the blister substrate during the heat sealing process. It determines whether the package can maintain a sealed state and prevent leakage of contents when subjected to external forces, such as extrusion and falling. The sealing integrity refers to whether there are defects such as micropores and cracks at the sealing of the aluminum foil, which may cause external gas or moisture to penetrate into the package and affect the stability of the product.
In order to ensure the sealing performance of aluminum foil for blister packaging, the quality, heat sealing temperature, pressure and time of the aluminum foil must be strictly controlled during the production process. High-quality aluminum foil has a smooth and defect-free surface, which is conducive to the formation of a uniform heat sealing layer; reasonable heat sealing temperature and time can ensure that the aluminum foil and the blister substrate are fully fused to form a firm bond; and appropriate pressure helps to eliminate bubbles in the heat sealing process and improve the tightness of the seal.
In addition, the printing and coating treatment of aluminum foil is also an important factor affecting its sealing performance. The selection of printing ink needs to consider its adhesion to the aluminum foil and its effect on sealing after printing; and coating treatment, such as the addition of anti-oxidation layer and adhesive layer, can further enhance the barrier performance and heat sealing strength of the aluminum foil.
In summary, the sealing performance of aluminum foil for blister packaging is the key to ensuring the overall protection effect of packaging. By optimizing the production process, strict quality control, and reasonable printing and coating treatment, the sealing performance of aluminum foil can be significantly improved, thereby extending the shelf life of the product and improving the consumer experience. With the continuous advancement of packaging technology, the sealing performance of aluminum foil for blister packaging will continue to be optimized, providing safe and reliable packaging solutions for products in more fields.
