The characteristics of the composite packaging material of aluminum foil and quality requirements

Aluminum foil is the only metal foil class in composite packaging materials, aluminum foil as the metal material, the resistance of water, gas blocking, shading, flavour is any other packing material is difficult to match. Aluminum foil is 99. 0% ~ 99. 97% purity aluminium, after many made by rolling, rich resources, price is quite advantage. A, 1 the characteristics of the aluminum foil. Aluminum foil with a shiny metal luster, adornment sex is strong. 2. Aluminum foil, non-toxic, tasteless, odourless, suitable for all kinds of food, medicine packaging 3. Is relatively light weight, only one-third of iron, copper and so on, rich extensibility, thin thickness, unit area is small. 4. Shading sex good, reflective rate can reach 95%, often used in reflective material. 5. Highly protective, make packing materials susceptible to bacteria, fungi, and insects. 6. The state of high temperature and low temperature stability, temperature in - 73~371° C shrinkage deformation does not go up. 7. Good barrier property, moistureproof, airtight, incense, can prevent the packing contents of moisture absorption and oxidation and volatilization metamorphism. 8. Aluminum foil is easy to be processed, with all kinds of plastic film, paper composite, etc. 9. The disadvantage of aluminum foil itself strength is low, easy to tear, can't separate for packaging products. Easy to tear when folding, produce hole, not resistant to acid and alkali. Second, the quality requirements of aluminum foil, aluminum foil surface appearance 1 should be clean, bright, smooth, no RIPS, indentation. No corrosion marks and leave the rough surface of the oil burning without lubricating oil trace and spots, no kerosene. 2, in addition to the oil pollution degree of composite packaging material with aluminum foil oil grade A - should be used B. 3, pinhole aluminum foil in the processing by the rolling process, rolling oil, the status of the rolling roll, the influence of the production environment, inevitably pinhole defects such as, so the barrier property of composite packaging material of aluminum foil will depend on the pore size and quantity. In GB3198 - In 1996, to the aluminum foil pinhole size and quantity are made the corresponding provisions. Among them, the medicinal aluminum foil pinhole diameter shall not be greater than zero. 3 mm, and no more than 5 / ㎡.