In the increasingly fierce market competition, everyone is working hard to create their own brand, to make their products stand out. The products of laser anodized aluminum stamped with superb hot stamping technology are rich in color and colorful, and then combined with rich layers of offset printing technology, not only make the product have a strong visual impact of brilliant, clean, three-dimensional and transparent, but also make The anti-counterfeiting performance of the product has been greatly improved, and it has played an unexpected anti-counterfeiting effect unknowingly. It is unique and popular on many commodity counters. To use the offset printing process to print exquisite products on hot stamping products, in addition to requiring a reasonable process design and operating specifications, we should also pay attention to the following issues. 1 Quality of anodized aluminum Because the printing is carried out on anodized aluminum, as an offset printing substrate, the quality of anodized aluminum plays an important role in printing. The phenomenon of "flying gold", "reverse pulling", "bubbles" and so on during the hot stamping of anodized aluminum will seriously affect the quality of offset printing. The main effect on the quality of offset printing is the adhesive layer and peeling layer of anodized aluminum. 1) The effect of the peeling layer (protective layer) of anodized aluminum on the quality of offset printing The peeling layer of anodized aluminum is also called protective layer, adhesive layer or heat-sensitive layer. It is composed of natural or fully-made paraffin, and its thickness is very small, only 0.01μm, but it has a great effect. Especially for printing on this layer, it needs to have the following characteristics at the same time: ①Good adhesion At normal temperature, paraffin wax adheres the PET or PVC film carrier to the base layer of the film, making it difficult to fall off, to avoid serious phenomena such as "flying gold" and "falling powder" of anodized aluminum during hot stamping. When the "flying gold" and "powder falling" are more serious in the hot stamping process, the gold powder will be absorbed and accumulated on the surface of the blanket of the offset printing machine during the offset printing process, which will affect the transfer of offset printing ink and the correct transmission of dots. , So as to reduce the clarity of the printed pattern. In severe cases, the blanket must be scrubbed for every few hundred prints. Cleaning the blanket so frequently not only seriously affects production efficiency, but also directly affects the hue of the product. ②Good ink absorption During bronzing, the paraffin wax quickly separates from the base layer when it is heated, and then undergoes a series of physical changes (curing-liquefaction-curing) instantaneously, and finally solidifies to form a protective layer on the surface of the bronzing pattern. During printing, the ink directly contacts this layer. If the cured paraffin has poor ink absorption, it is easy to cause the ink to fall off and the hue to change. Therefore, we generally require that this layer of anodized aluminum manufacturers require that the surface tension dyne value must be above 38 to meet the printing requirements. 2) The effect of the adhesive layer of anodized aluminum on the quality of offset printing During hot stamping, the adhesive layer of anodized aluminum should be well bonded to the paper and must maintain a certain strength. If not, the gold foil will be "pulled out" by the blanket during the offset printing process, resulting in "pasting" , "Ink can not be transferred", "Hue change" and other quality issues. Therefore, the most important thing for bronzing is to combine the adhesive with the hot stamping substrate, that is, the adhesion of the anodized aluminum to the paper is greater than the adsorption force of the offset ink to the anodized aluminum. Therefore, choosing the anodized aluminum material suitable for offset printing is the most effective way to solve the "anti-pull". 2 bronzing pressure Bronzing pressure is an important condition for achieving the transfer of gold foil to paper. Because the product needs to be pressed during bronzing, the surface of the bronzing pattern after pad pressing inevitably has fine unevenness and uneven thickness. If the printing pressure is uneven, the printing ink on the plate will inevitably appear The density is uneven, and the dots are deformed or made false. In severe cases, the phenomenon of printing is not possible. Generally speaking, the pressure of bronzing should not be too large, but it should not be too small. If the bronzing pressure is too high, the method of offset printing is to perform partial padding on the back of the blanket, the impression cylinder, and the liner, but this method not only takes more time, but also causes damage to the offset printing equipment. If the bronzing pressure is too low, the adhesion strength between the anodized aluminum and the paper will be insufficient, causing the anodized aluminum to "pull back" and "fall out". Because the offset printing plate is relatively complicated and not easy to operate, the better way is to solve it from bronzing: Improve surface smoothness of hot stamping Minimize the local pressure of bronzing Avoid steep slopes when stamping Reasonably match the pressure of bronzing with the pressure of offset printing Special attention should be paid to the fact that the local stamping of the bronzing causes uneven pressure on the same plate, and offset printing will cause "unrealistic printing". At this time, pressure treatment must be performed. During the pressure treatment, the phenomenon of "several hues on one page" appears. Therefore, try not to adopt the partial pressure compensation method on a pattern when stamping. In order to check whether the anodized aluminum has "reverse pull" and "drop powder", the general practice is to use ordinary transparent adhesive tape to check. If it is easy to be pulled out, then the "reverse pull" phenomenon is easy to occur in offset printing. [next] 3 Register Because it is printed on a specific bronzing pattern, the offset registration is for each bronzing pattern. Any fluctuation in the bronzing registration will directly affect the registration of the offset printing. If it is necessary to perform the subsequent process on the pattern of the offset printing, the registration of the offset printing will affect the next process. Therefore, from the process design of the product to the production of the sample, we must make a detailed regulation of the registration of each process in advance. For example, in the production process, sorting rules, marking the products that have passed the rules, and not allowing arbitrary speed changes in the production process. Bronzing will cause register fluctuation due to the following reasons. The expansion and contraction of paper; Bronzing pressure changes; Bronzing plate displacement; Bronzing machine speed changes; The register fluctuation of the bronzing machine itself; Poor paper feed. Generally speaking, to stabilize the printing pressure of offset printing and adjust the paper for offset printing, the following methods can be used to control the register. Consider the production of printing bleeding from the process to meet the slight registration fluctuations; Bronzing according to the offset printing product version, use the offset printing product to check whether the location of the bronzing is accurate; Stabilize the bronzing registration, and use the bronzing product to re-plate according to the bronzing registration after offset printing. This is the method commonly used at present. If the bronzing register is unstable and fluctuates considerably, it will increase a lot of costs. Use film to control the bronzing register, and use the foil outline to outline a film with a border of 50. Use this film to check the register fluctuation of the bronzing machine during bronzing. In the actual production process, "anti-pulling" and "dropping powder" are problems we often encounter. The remedies generally taken are: Reheat the product; Reduce the viscosity of ink; Reduce printing pressure and machine speed; Use medium (hard) blankets; Use a special blanket; Use medium (hard) liner; Dig a groove in the blanket. In recent years, our company has successfully integrated bronzing and offset printing to create a brand for customers while also improving our own market competitiveness (currently, there are a variety of products using this technology), which has also driven Development of related process technology. Printing on bronzing patterns is a relatively complicated emerging technology. It mainly uses complex technology to express the uniqueness of products and play a good anti-counterfeiting role. However, if the process design is improper, there is a disconnection between the various processes, and the coordination is not good, there will be problems such as registration fluctuations, reverse printing, and uneven pressure, which will seriously affect the quality of the product and thus affect the market image of the product. This is a model of ergonomic 3-legged Electric Height Adjustable Desk.
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