One of the purposes of increasing the hot stamping process is to improve the product quality. However, in practical applications, only reasonable use can play a multiplier role. Conversely, not only does it fail to show the advantages of the product, but it also causes waste. The following points should be taken into account when using the electro-aluminum hot stamping process.
1. Product Design Considerations
1 The hot stamping part should be fully considered, that is, the matching of the color and the printing color of the hot stamping characters or patterns, and the influence of the hot stamping process on the hot stamping.
2 Consider the overall effect of hot stamping and the cost of hot stamping. For example, some products often only hot stamp the outline and text of the pattern, and do not directly stamp the pattern to achieve the effect of point lining; for certain aluminum-plated paper cigarette packs, the printing design can be achieved by first printing the transparent yellow and pressing the bumps. Replace hot stamping to reduce costs.
3 Hot stamping on a large area should also take into account the hot stamping site and the printing pattern of the paper, which need to be based on product overlay accuracy, generally set to 0.2-0.5mm. Of course, we must also take into account the stamping adaptability of the aluminum itself.
2. The effect of printing before hot and after hot processing
General hot stamping products must be printed before hot stamping, with monochrome printing and multi-color printing; stamping after embossing, UV glazing, laminating, and then printing, die-cutting, paste boxes and other processing.
Pre-hot printing should pay attention to the following points: dark thin printing, the use of strong coloring ink, in the ink as little as possible to add anti-adhesive agent and retreat agent, try not to spray, printing ink, coating oil and anodized aluminum The matching of printability of hot stamping should also prevent the influence of ink crystallization on hot stamping.
After pressing, it is pressed and embossed and die-cut. The effect of the gluing box on the hot stamping is not great. Just take care to prevent the hot stamping foil from being scratched. If you want to use uV varnish after hot stamping, you should consider the acceptability of the electrochemical aluminum, that is, the surface tension of the electrochemical aluminum is greater than the surface tension of UV varnish. If allowed, the hot stamping part of some products can be hollowed out. If UV inks are first printed and then hot stamped according to the process requirements, the stamping properties of the UV varnish should be checked first. Generally, the dyne pen is used to test the UV light film layer, and the surface tension can be more than 3.810-2N/m. Electrochemical aluminum hot stamping.
3. Selection of hot stamping materials and equipment
Hot stamping materials and hot stamping equipment are the two most critical factors affecting the stamping effect.
1 Hot Stamping Material
Hot stamping material is anodized aluminum. There are many kinds of galvanized aluminum on the market today. There are ceramic anodized aluminum and paper anodized aluminum. Glass electro-aluminum, etc.; complex grades, both domestic aluminum, real estate in Shanghai, Zhejiang, Fujian, and the United States. Japan-made, German-made imported aluminum, and their respective advantages and disadvantages. Here we mainly discuss paper aluminum.
The hot stamping adaptability of anodized aluminum includes surface finish, brightness, sharpness, hot stamping adaptability to graphic and small texts, surface flying gold and flash edge problems, etc., which must be based on different substrates, grades of packaging products, and anodized aluminum. The choice of price and hot stamping trade-offs.
2 Hot stamping equipment
Hot stamping equipment is widely used in China is a hand-type hot stamping machine, the main hot stamping requirements are not very high packaging products. It has low cost. Small footprint, easy operation, strong hot stamping advantages, but the hot stamping accuracy of high-quality products, the larger error, higher reject rate. If you have a hot box, most printing companies in China choose Bobst Hot Stamping Machine. The hot stamping accuracy is very high, and the control of hot stamping temperature, pressure and speed is better than other hot stamping machines. At present, some domestic hot stamping machines are also highly accurate and the price is much lower than that of imported high-end equipment.