Aluminium Foil Roll with Flexible Size Width 45cm
|alloy||1235 8011 8079 1200|
|width||as your request|
|usage||to be used for food packaging /cigarette packaging after lamination|
|surface||one side bright,one side matt|
|packaging||free fumigated wooden box|
Aluminium Foil Used For Food Packaging
Flexible packaging aluminum foil is mainly used for its metallic luster, light insulation, gas barrier, certain strength and ductility. Depending on the application, the emphasis on performance is also different.
Pinhole is the most important index, especially for 0.02mm, 0.015mm aluminum foil, because aluminum foil is the main packaging material, it is required not to have pinhole. The 0.009mm, 0.007mm aluminum foil is usually used as one of the composite layers, and the number of pinholes is controlled at 30 / m2. The aluminum foil plays a major sealing role, while the composite layer plays a supporting role. There was a theory that if the diameter of the pinhole is less than 0.005mm, it will not be able to ventilate and water. However, it has been proved that the pinhole will be breathable and permeable. It's just a matter of permeability. The air permeability and water permeability of non pinhole aluminum foil can be considered as zero. 0.3mm pinholes account for 9% of the total area and 30 pinholes account for 3% of the total area. That is to say, the air permeability and water permeability of aluminum foil composite are more than one million times lower than that of raw materials. Generally, the diameter of needle holes is about 0.05mm-0.3mm. Therefore, the relationship between the number of pinholes and the air permeability can be determined. The area of the pinhole is directly proportional to the square of the diameter, so the area of the 0.03mm pinhole is 100 times less than that of the 0.3mm pinhole. It can be said that aluminum foil and no aluminum foil are different grades of packaging. The air permeability and water permeability of aluminum foil differ by more than one million times. The shading property of aluminum foil can also be described in a similar way. The above description is suitable for statistical significance. For specific packaging, due to the uneven distribution of pinholes, the number of pinholes is not directly proportional to the air permeability. For example, if there is a pinhole in the package of 10 mm × 10 mm, its sealing effect can only be increased by 1000-10000 times.
Non toxic and pollution-free is one of the main requirements of aluminum foil. The surface of aluminum foil is clean and free of oil. It is required that the rolling oil and related media for the production of this kind of aluminum foil should be free from toxicity, meet the food grade hygiene standard (1% aromatics and 5ppm low sulfur), and the surface tension should meet the requirements to ensure the composite bonding strength.
Mechanical property requirement is one of the characteristics of this kind of aluminum foil. Because this kind of aluminum foil needs to be sealed and hot pressed, proper plasticity becomes very important. Otherwise, it is easy to crack during hot pressing sealing. Similarly, this kind of aluminum foil is not easy to be too thin, the thickness is generally greater than 0.007mm. Too thin is easy to crack.