Many food packaging will use metal packaging materials, such as tinplate lids, tin boxes, etc. Generally speaking, metal packaging materials have the following advantages:
(1). It has excellent barrier properties and excellent comprehensive protection properties. The permeability of metal packaging materials to gas, water and water vapor is extremely low (almost zero), has good fragrance retention, and is completely opaque, which can effectively avoid the harmful effects of ultraviolet rays; its gas barrier properties, moisture resistance, The shading and fragrance retention far exceed other types of packaging materials such as plastic and paper. Therefore, metal packaging can provide excellent protection for the contents, which is beneficial to maintaining the quality of the product for a long time.
(2). It has excellent mechanical properties, processability and high strength. Metal packaging materials have good ductility and high strength, and can be processed by stamping, rolling, stretching, welding, etc., and can be made into packaging containers with thin walls, high compressive strength, and not easy to break. These materials are combined to form a composite packaging material with excellent comprehensive performance.
(3). It has a special metallic luster and good surface decoration. The special metallic luster and the exquisite decoration and printing can make the product appearance rich and gorgeous, beautiful and marketable, and at the same time can increase the value of the product. Packaging tin box
(4). Convenient and sanitary. Metal packaging containers and inner coatings-generally can meet the requirements of hygiene and safety, the products packaged with them are easy to carry and use (generally equipped with easy-opening devices, such as the pull ring of a can), can adapt to different climatic conditions, and are discarded It has good material handling properties and can be recycled and reused.
Although metal packaging materials have many advantages, they also have disadvantages, including:
(1). The chemical stability is poor, especially the steel materials are easy to rust, and generally should be coated with anti-rust materials: acid and alkali resistance is weak, when packaging acidic materials (especially food), metal ions will precipitate and affect the product Quality, generally requires inner coating isolation protection:
(2). The price of metal packaging materials is higher than other packaging materials, and the overall packaging cost is also higher.