Aluminum foil is the only metal foil in composite packaging materials. As a metal material, aluminum foil is difficult to match with any other packaging materials in terms of water resistance, gas barrier, shading, and taste retention. Aluminum foil is made of electrolytic aluminum with a purity of 99.0% ~ 99.97% , which is produced after many calenderings. It is rich in resources and has a considerable advantage in cost performance.
1. Features of aluminum foil
1. Aluminum foil has shiny metallic luster and strong decoration.
2. Aluminum foil is non-toxic, tasteless and odorless, suitable for various food and medicine packaging
3. Relatively light weight, the specific gravity is only one-third of iron, copper, etc., rich in extensibility, thin, and small unit area.
4. Good shading, reflective rate up to 95% , often used in reflective materials.
5. Strong protection, so that the packaging is not easily attacked by bacteria, fungi and insects.
6. The high temperature and low temperature conditions are stable, and the temperature does not expand and contract at -73 ~ 371 ° C.
7. Â Excellent barrier property, moisture-proof, air-proof and fragrance-preserving, which can prevent moisture absorption, oxidation and volatilization of package contents.
8. Aluminum foil is easy to process and can be compounded with various plastic films and paper.
9. The disadvantage of aluminum foil is that it has low strength and is easy to tear, so it cannot be used alone for packaging products. It is easy to tear when folded, producing perforation, and is not resistant to acid and alkali.
Second, the quality requirements of aluminum foil
1, Â Exterior
The surface of the aluminum foil should be clean, bright, flat, free of cracks and indentations. No traces of corrosion and rough surface left by burning oil, no traces and spots of lubricating oil, no kerosene smell.
2, Â Degreaser
The oil stain grade of aluminum foil for composite packaging materials should use AB grade.
3. Â Pinhole
The aluminum foil is affected by the rolling process, rolling oil, rolling rollers, and the production environment during processing. Defects such as pinholes are inevitable . Therefore, the barrier properties of aluminum foil in composite packaging materials depend on the size and number of pinholes . In GB3198-1996 , the size and number of pinholes of aluminum foil are specified accordingly. Wherein the pharmaceutical foil pinhole diameter no larger than 0.3mm, and not more than 5 / m.
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