As one of the commonly used materials in flexible packaging, aluminum foil has its unique characteristics and advantages. This article will introduce the processing of aluminum foil.
Simple processing of aluminum foil
The aluminum foil blank is a cold rolled aluminum coil with a thickness of 0.4-0.7mm and a high multiple deformation rate. The aluminum foil blank is pre-quenched at 240-480℃, and then sent to the roller press for high hardness and high finish. After rough rolling, intermediate rolling and finishing rolling, the steel rolls are rolled into sheets, and finally quenched to form aluminum foil. The thickness of the aluminum foil can be controlled by adjusting the tension, the rolling force during rough rolling, and the speed during finishing rolling.
During finishing rolling, the thickness of the aluminum foil decreases as the rolling speed increases; the greater the tension, the smaller the thickness. The minimum thickness produced by the belt production method can reach 0.0025mm and the width can reach 1800mm. This kind of aluminum foil that has not undergone other processing is called light foil or plain foil. The light foil has a poor carrying capacity and is rarely used alone. Generally, according to different uses, the light foil must be further processed to make more advanced packaging materials.
Deep processing of aluminum foil
Laminate aluminum foil with plastic film, paper, cellophane, etc. with adhesives or coat and compound with PE, etc. to form composite films for various purposes.
The aluminum foil can be displayed in various colors on the coloring machine, and its metallic luster is expected to cooperate to form a unique luster color and improve its decorative performance.
Aluminum foil can be printed directly, or printed on the surface after coating, generally using flexographic printing, gravure printing and screen printing. Because aluminum foil is not absorbent and its surface adsorption capacity is poor, printing needs to rely on the volatilization of the solvent in the coating to dry. In addition, the aluminum foil is very soft, so it is necessary to ensure that the softness of the printing ink is consistent with that of the aluminum foil after the printing ink is dried, and the ink film cracks, small pieces fall off, and even the whole separation phenomenon occurs in Party B. When printing, the thin aluminum foil should be supported by a pallet or mounted with a liner before printing to prevent the aluminum foil from breaking. The printed aluminum foil is used as a sales packaging material, and its special luster is matched with the ink, which has a good product decoration effect.
The aluminum foil can be used to emboss various light and dark concave and convex patterns on the embossing machine, which is used to wrap food with a very decorative effect. Aluminum foil embossing can also improve its surface flatness and eliminate its slight wrinkles.