Analysis of the factors affecting the quality of anodized aluminum stamping
With the continuous improvement of people's living standards, people's requirements for printing quality are getting higher and higher. The vigorous development of the printing industry has prompted the widespread application of the hot stamping process, especially holographic positioning hot stamping, in the printing and packaging industry. It not only has a good sensory effect on gloss, three-dimensional sense, color, metallic feeling, but also has a unique anti-counterfeiting function, so it is more and more popular among consumers. In addition, the unique hot stamping highlights the personalization, environmental protection and safety of product packaging. Many high-end packaging uses a hot stamping process, so it is very meaningful to study what is the hot stamping process and the factors that affect the hot stamping process. 1. The principle and process of hot stamping Anodized aluminum hot stamping refers to a post-press processing technique of hot stamping, hot stamping or other materials. For ease of discussion, in the following discussion, anodized aluminum hot stamping is simply referred to as hot stamping. Hot stamping has two main functions: one is surface decoration and sales promotion, and can be combined with the embossing process to display 3D effect; the second is higher anti-counterfeiting performance, using holographic positioning hot stamp trademark logo, anti-counterfeiting and brand protection . 1. Structural characteristics of anodized aluminum The basic structure of anodized aluminum foil is divided into 4 to 5 layers: a base layer, a peeling layer, a protective layer, a colored layer, an electroplated layer, and an adhesive layer. Among them, silver anodized aluminum has no colored layer. The main functions of each layer are: ①Base layer: Generally use bidirectionally stretched polyester film with a thickness of 12μm-25μm, the main function is to support the coatings attached to it, which is convenient for continuous hot stamping during processing. ② Peeling layer: peel off the anodized aluminum foil from the base layer, this layer determines the transferability of the anodized aluminum; generally it is coated with silicone resin. The main function is to make the color material, aluminum and adhesive layer quickly detach from the polyester film after hot stamping and be transferred and bonded on the surface of the hot stamped object. ③Coloring layer: There are two main functions: one is to display the color; the other is to protect the graphics and text of the aluminized layer that is printed on the surface of the article from oxidation. The colors of anodized aluminum foil are golden, orange, gray, red, blue, green and so on. The color of the color layer is given gloss through the aluminum plating layer, and the color has certain changes, such as yellow after cobalt plating is gold, and gray aluminum plating becomes silver and so on. The coating requirements for the colored layer are fine without any small particles, so as to avoid trachoma and uniform coating. ④Electroplating layer: The main function is to reflect light and change the color of the color layer to make it appear metallic luster. ⑤ Adhesive layer: The main function is to bond the hot stamping material to the hot object. 2. The principle of hot stamping Hot stamping is a special printing process that does not require ink. Under the action of a certain temperature and pressure, a process of transferring the material to be stamped onto the substrate. The specific operation process is to use the template installed on the hot stamping machine under the appropriate pressure and temperature, so that the substrate and the foil are instantly pressed against each other, and the hot stamping material is transferred to the substrate according to the graphic of the hot stamping template. Surface process. There are four elements in the hot stamping process: hot stamping foil, hot stamping template, hot stamping machine and substrate. 3. Hot stamping process There are two hot stamping methods: hot stamping and hot stamping. The general operation process is as follows: Pre-press preparation → plate installation → pad version → apply initial value of process parameters → trial ironing → signing sample → formal hot stamping The hot stamped pattern has the characteristics of clear, beautiful, colorful and wear-resistant. Widely used in cigarette packaging applications, it has extraordinary value in graphic design, especially in trademarks and registered names. Second, the main factors affecting the quality of hot stamping The main factors affecting the quality of hot stamping are the hot stamping suitability of the substrate, the performance of the anodized aluminum material, the hot stamping temperature, the hot stamping pressure, and the hot stamping speed. The perfect graphic bronzing effect depends on the degree of cooperation with each other. Therefore, it is necessary to strictly control the temperature, pressure and speed in the hot stamping process to ensure the quality of hot stamping. 1. Temperature Appropriate temperature is one of the guarantees of hot stamping quality. If the temperature is too high and the melting is excessive, the anodized aluminum around the hot stamped text will easily fall off and cause paste. At the same time, the high temperature will also cause chemical changes in the anodized aluminum dyeing resin and the aluminum layer, which will reduce the brightness of the hot stamped product and lose the metallic luster. It may even make the blots appear blistered or bubbly; on the contrary, if the temperature is too low, the melting will be insufficient, which will cause the hot stamping to be inadequate, the blots not firm, easy to fall off or lack of pen strokes, and the blots to bloom. 2. Pressure Whether the pressure and temperature are properly matched is also an important guarantee for the quality of hot stamping. At a certain temperature, if the pressure is insufficient, the anodized aluminum can not be transferred to the substrate well, causing problems such as false imprinting and patterning; on the contrary, if the pressure is too high, the compression deformation of the pad and the substrate is too high If it is large, the print will be thick, and even sticky or paste. Generally, the stamping pressure should be adjusted from small to large, with the principle of not fading and smooth edges. 3. Speed The speed of hot stamping actually reflects the contact time between the substrate and the hot stamping foil during hot stamping, which directly affects the fastness of hot stamping. If the speed of hot stamping is too fast, it will result in the failure of hot stamping or imprinting. On the contrary, if the speed is too slow, the gold foil will lose its metallic luster, affect the quality of printing, and affect the production efficiency. 4. Anodized aluminum In the hot stamping process of tipping paper products, the quality of anodized aluminum is closely related to the quality of hot stamping. Improper tightness of the anodized aluminum (too loose and too tight) will cause hot stamping to be untrue; incorrect or unstable hot-melt hue will also directly affect the quality of the print. To a certain extent, good quality anodized aluminum is a prerequisite for the quality of hot stamping, and grasping the quality of anodized aluminum is equivalent to controlling half the quality of the printing. 5. Ironing materials The effect of ironing materials on the quality of tipping paper printing is mainly reflected in the ink layer on the surface of ironing materials. The temperature resistance and thickness of the ink layer directly affect the quality of the hot stamping, especially the inappropriate temperature of the glue will cause hot stamping paste; when using pearlescent ink to print anodized aluminum, more attention should be paid to the curing time and tension control . 3. Conclusion The bronzing process is a complex process technology, and may encounter various problems in actual production. After sorting out the common problems and solutions. In short, only by strictly controlling the factors that affect the hot stamping process can satisfactory hot stamping results be obtained. In the hot stamping process, only by grasping these problems can we obtain satisfactory hot stamping results. LaTeX cushion, math pillow, programmer gift, geek home decor, equation pillow NINGBO CHEN WEI SUPPLY CHAIN MANAGEMENT CO.,LTD , https://www.chenweisupply.com