Aluminum Foil 8079 Used To Be Laminate

Barrier performance requirements of aluminum foil 8079 composite film for laminated pharmaceutical packaging

High barrier packaging materials generally refer to high oxygen barrier materials (such as PA, EVOH, etc.) used for food composite films. However, for pharmaceutical packaging, most pharmaceuticals are sensitive to water vapor but not oxygen. The barrier properties of packaging are usually moisture-proof.
Medicines are special commodities with high added value and high safety and reliability requirements. Except for the packaging of traditional Chinese medicine pieces and low-end granules, the composite film of pharmaceutical packaging basically uses pure aluminum foil composite materials, while food packaging generally still uses transparent or low-end granules. Mainly aluminum-plated packaging.

Due to the high barrier properties of aluminum foil composite materials, side penetration that was originally negligible can no longer be ignored. In addition to considering the penetration of packaging materials, packaging bags made of aluminum foil composite materials should also consider penetration of the heat-sealed edges of the packaging bags. The heat sealing edge should be of sufficient width, and the heat sealing material used must have certain barrier properties. An aluminum foil composite film with a water vapor transmission rate of 0.25g/m2·24h (cup method 38°C RH90%) was made into a bag, and fully dried anhydrous calcium chloride was sealed in the bag, and the weight gain was measured. a period of time. In 2010, when the edge sealing width was 8mm, the water vapor transmittance of the aluminum foil composite film was 0.0014g/m2·24h; when the edge sealing width was 20mm, the water vapor transmittance of the aluminum foil composite film was 20mm. 20mm. The pass rate is only 0.0008 g/m2·24h. It can be seen that the edge sealing width has an impact on the barrier performance of aluminum film composite bags. Further experimental results show that when the aluminum foil thickness is greater than 15 μm, the barrier performance of the aluminum foil composite bag is completely determined by the edge width and quality.

Aluminum foil is a special material different from plastic. During the packaging, transportation and sales process of aluminum foil composite film, attention should also be paid to the problems of crushing, crushing and cracking of the aluminum foil layer. After the high-barrier aluminum foil layer is damaged, although air leakage will not occur, its barrier performance is greatly reduced, seriously affecting the shelf life of the product.