Anodized aluminum hot stamping is a very important post-printing process in packaging and printing. It mainly stamps patterns, text, and lines to highlight the product name and trademark. Ang brand, beautify products, thereby improving the quality of packaging products. Anodized aluminum hot stamping is also often used for post-press processing of hardcover book covers, greeting cards, calendars and other products.
The stamping process of anodized aluminum is as follows: the anodized aluminum is heated by a hot stamping plate, the peeling layer is melted, and then the adhesive layer is also melted. During the imprinting, the adhesive layer is bonded to the substrate, the colored layer is separated from the polyester film base layer, and the aluminum is plated. The layer and the colored layer remain on the substrate.
Hot stamping anodized aluminum on the package can not only beautify the product and improve the product grade, but also play a certain role in anti-counterfeiting.
Hot stamping after printing
One of the purposes of adding the hot stamping process is to improve the product grade, but in practical applications, only reasonable use can play a multiplier effect. On the contrary, not only can it not reflect the advantages of the product, but also cause waste. Reasonable use of anodized aluminum hot stamping process should pay attention to the following points.
1. Things to consider in product design
â‘ Fully consider the location of hot stamping, that is, the matching of the color of the hot stamped text or pattern with the printing color and the impact of post-hot stamping processing on hot stamping.
â‘¡Consider the overall effect of hot stamping and the cost of hot stamping. For example, some products often only stamp the outline and text of the pattern and do not directly stamp the pattern to achieve the effect of dotted surface; for the printing design of some aluminized paper cigarette packs, the transparent yellow can be printed first and then the concave and convex Replace hot stamping, thereby reducing costs.
â‘¢For hot stamping on a large area, it should also take into account the hot stamping position and the printing pattern's receiving paper, which depends on the accuracy of the product overprint, generally set to 0.2-0. 5mm. Of course, we must also consider the suitability of anodized aluminum itself.
2. The effect of printing before ironing and processing after ironing
General hot stamping products must be printed before hot stamping, there are single-color printing and multi-color printing; after hot stamping, it needs to be processed such as embossing, UV glazing, laminating, reprinting, die cutting, and paste box.
Points to note before printing: dark and thin printing, use ink with strong coloring power, add anti-sticking agent and removing agent as little as possible in the ink, try not to spray powder, printing ink, varnish and anodized aluminum The printing suitability of hot stamping should be matched, and the influence of crystallization of ink on hot stamping should also be prevented.
In the post-scaling process, the unevenness and die cutting are pressed. The effect of paste boxes on hot stamping is not great, just pay attention to prevent scratches on hot stamping foil. If you want to apply uV varnish after hot stamping, you should consider the acceptability of anodized aluminum, that is, the surface tension of anodized aluminum is greater than the surface tension of UV varnish. If allowed, the hot stamping part of some products can be hollowed out. If you need to print UV varnish first and then hot stamping according to the process requirements, you should first check the hot stamping suitability of the surface of the UV varnish. Generally, use a dyne pen to test the UV varnish film layer. Carry out anodized aluminum stamping.
3. Selection of hot stamping materials and equipment
Hot stamping materials and hot stamping equipment are the two most critical factors that affect the effect of hot stamping.
â‘ Hot stamping materials
The hot stamping material is anodized aluminum. There are many types of anodized aluminum on the market, including ceramic anodized aluminum and paper anodized aluminum. Glass anodized aluminum, etc .; complex grades, both domestically produced anodized aluminum in Shanghai, Zhejiang, Fujian and other real estate, and American-made. Imported anodized aluminum made in Japan and Germany has its own advantages and disadvantages. Here we mainly discuss paper anodized aluminum.
The hot stamping suitability of anodized aluminum includes the surface finish, brightness and clarity, the hot stamping suitability for graphics and small text, the surface fly gold and burrs, etc., according to different printing materials, packaging product levels, anodized aluminum The choice between price and hot stamping suitability.
â‘¡Hot stamping equipment
The hot stamping equipment is widely used in China is the hand-swing hot stamping machine, the main hot stamping requirements are not very high packaging products. It has low cost. It has the advantages of small footprint, easy operation, and strong suitability for hot stamping. However, for products that require higher precision in hot stamping, the error is larger and the reject rate is higher. If the hot stamping packaging box is used, most domestic printing companies choose the Bost hot stamping machine. The hot stamping accuracy is very high, and the control of hot stamping temperature, pressure and speed is also better than other hot stamping machines. At present, some domestic hot stamping machines are also very accurate, and the price is much cheaper than imported high-end equipment.
Printing after ironing
Post-press printing is a top-notch technology, which is widely used in cigarette pack printing, and its three-dimensional effect is beyond the reach of other processes. Post-iron printing is generally to stamp a large area of ​​laser anodized aluminum on spot color ink, and then print UV ink on the anodized aluminum. Its on the printing materials. The requirements of printing ink, printing equipment and printing personnel are relatively high. The following points should be noted in this process:
â‘ Choose anodized aluminum with a surface tension of (4.0-4.6) X10-2N / m to ensure good adhesion of the ink.
â‘¡During the hot stamping process, it should be noted that the hot stamping does not allow pasting, reverse pulling, or hot stamping. Otherwise, the anodized aluminum stamped during the second printing will fall off and accumulate on the blanket, seriously affecting product quality and production efficiency.
â‘¢ Comprehensive consideration of printing, hot stamping and post-hot stamp printing. It is appropriate to control the ambient temperature and humidity of the workshop, and try to avoid human factors to cause newspapers
â‘£ When designing, you should pay attention to whether it is possible to hollow out or separate hot stamping in large area hot stamping to reduce the difficulty of hot stamping.
Hot stamping anti-counterfeiting
With the development of society, people pay more and more attention to the anti-counterfeiting of high-end products. Anti-counterfeiting has been applied to the entire packaging industry, such as ink anti-counterfeiting, printing pattern anti-counterfeiting, paper anti-counterfeiting, hot stamping anti-counterfeiting, UV oil anti-counterfeiting, etc. Hot stamping anti-counterfeiting is relatively demanding. A kind of anti-counterfeiting technology with complicated control, here mainly introduces two anti-counterfeiting methods.
â‘ The laser pattern carried by the anodized aluminum itself, by transferring the hot stamping pattern to the substrate, makes the stamping surface of the substrate bear various rainbow patterns, thus playing a role of anti-counterfeiting. This type of anodized aluminum process is more advanced, more difficult to produce, and more expensive, which makes copyers discouraged.
â‘¡Using the holographic anti-counterfeiting pattern on the anodized aluminum, the complete pattern is positioned on the pattern fixed by the substrate through mechanical control. This process uses the trinity of hot stamping plate, holographic anti-counterfeiting anodized aluminum pattern and substrate pattern for positioning and registration, which is more difficult.
Since hot stamping anti-counterfeiting is a relatively new technology, it has higher requirements on the operator. It must be reasonably controlled to minimize unnecessary waste.
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