Aluminum-plastic composite bag for food packaging and processing method thereof

Abstract

The invention discloses an aluminum-plastic composite bag for food packaging and a processing method thereof, and belongs to the technical field of food packaging. The innermost layer of the aluminum-plastic composite bag is an aluminum foil layer, a biaxially oriented polypropylene layer and a heat sealing film layer are sequentially arranged outwards, and the layers are bonded through an adhesive. The aluminum foil layer is 1235 double-zero foil with the thickness of 0.008 to 0.009 mm and is prepared from the following raw materials in parts by weight: 0.086 percent to 0.10 percent of Si, 0.37 percent to 0.43 percent of Fe, 0.005 percent to 0.01 percent of Cu, 0.005 percent to 0.01 percent of Mn, 0.005 percent to 0.01 percent of Mg, 0.005 percent to 0.01 percent of Cr, 0.005 percent to 0.01 percent of Zn, 0.02 percent to 0. 03 percent of V, 0.013 percent to 0.030 percent of Ti, less than or equal to 0.01 percent of other single impurities, less than or equal to 0.05 percent of total impurities and the balance of Al; and the aluminum foil layer is formed by casting, saw milling, soaking, hot rolling, primary cold rolling, primary annealing, secondary cold rolling, foil rolling and finished product annealing. The tensile strength and the elongation of the aluminum foil processed by the method provided by the invention are improved to different degrees, the corrosion resistance is improved, the metal element migration speed of the aluminum-plastic composite bag is low when the aluminum foil is applied to food packaging, and the preservation time of food is prolonged.

Description

technical field [0001] The invention belongs to the technical field of food packaging, and in particular relates to an aluminum-plastic composite bag for food packaging and a processing method thereof. Background technique [0002] With the improvement of living standards, food packaging has become an important part of the food industry. It plays an irreplaceable role in protecting food, preventing food from being contaminated by external microorganisms or other substances, preventing or reducing food oxidation and other reactions. Aluminum foil is currently the only metal material used for composite packaging materials. It is impermeable to light, oxygen, and moisture without pinhole defects, and has ideal theoretical barrier properties. Aluminum-plastic composite bag (vacuum bag or aluminum foil bag) is a packaging product that combines various packaging advantages. It is low in cost and is used in food packaging. It can be used to package aquatic products, cured meat, qui...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of low elongation, low tensile strength and poor corrosion resistance of the aluminum foil in the aluminum-plastic composite bag for food packaging in the prior art, the present invention provides an aluminum-plastic composite bag for food packaging and a processing method thereof. The tensile strength and elongation of the aluminum foil processed by this method have been improved to varying degrees, and the corrosion resistance has been improved. When used in food packaging, the migration speed of metal elements in aluminum-plastic composite bags is slow, and the preservation time of food is prolonged.

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