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Material Features of Aluminum ROPP Closures
Inputtime:2014-03-03 15:43:19
  Currently, glass bottles packaging is widely used in the packages of white spirits, grape wine, tonic wine and beverage, and 50% of the caps they use are ROPP ones made of aluminum alloy material. In China, there are nearly 200 aluminum manufactures which can produce hundreds sorts of caps, and the growth rate of aluminum ROPP closures is 10% each year. Aluminum ROPP caps on the hardness, elongation and size deviation are required strictly, or it will cause fracture and crease during punching processing. In order to keep the finished caps printing easily, the aluminum sheet must be plain, no scratches and taints, so the alloy 8001 is a good choice. The general thickness of sheet is 0.20~0.24mm. There are two techniques for aluminum ROPP material production: hot rolling, continuous casting and rolling, then through cold rolling. The production practice shows that the application effect of hot rolling is prior to continuous casting and rolling.

  The advantages of aluminum material:

  1. Low Density: The feature of aluminum enables containers to lighten the load easily. Its surface can naturally form a slice of compact Al2O3, and this colorless film prevents further oxidation.

  2. No Poison and Smell: Aluminum meets the food &health food standard.

  3. High Gloss Surface: It helps to be printed easily and effectively.

  4. Good Performance:Aluminum has good performance for reflection and transmission of heat and light, and it can improve the effect of canned food heat sterilization and cryogenic processing.

  5. Mechanical Property: The property can’t be changed even in low temperature, which especially suit for frozen food packaging.

  6. Recycled: The waste aluminum can be recycled, which can not only save energy but also to prevent the pollution.

  The disadvantages of aluminum material:

  1. High Price: Power consumption of aluminum production is higher than tinplate and TFS.

  2. Inoxidability: Aluminum corrosion is bad, not suitable for containing acidic, alkaline and salt content of food.

  3. Soft: The texture of aluminum is soft, which easily causes deformed, surface scratches during transportation.