Since the silicone hot stamping plate appears late in the hot stamping industry in China, some of the existing preparation techniques are not mature enough. Therefore, some problems are often encountered in the selection and use process. The following are some typical problems that often occur. .
Silicone Hot Stamping Selection
The hardness of the silicone layer of the existing silicone hot stamping plate is above HS60, generally HS85±5. This is because if the hardness of the silica gel layer is too low, it is easily deformed under high temperature and high pressure, so that the shear force of the plate facing the electrochemical aluminum is not enough, thereby affecting the hot stamping effect. Therefore, under normal circumstances, the hardness of the selected silicone layer should be greater than HS80.
With the increase of the hardness of the silica gel layer, the elasticity of the silica gel layer will generally be influenced by the impact, and the elasticity is directly related to the effect of hot stamping. If the elasticity of the silica gel layer is not good, it will inevitably lead to the edge extension of the stamping image. , adhesion is not strong. There are flashes and other phenomena. Therefore, in the selection of silicone hot stamping, resilience should pay attention.
In order to facilitate the installation of silicone hot stamping plate on the hot plate, the base plate of silicone hot stamping plate is generally made of aluminum plate with a thickness of 1-3 mm. The adhesive strength between the silica gel layer and the aluminum plate is directly related to the service life of the silicone hot plate. If the adhesive strength between the silica gel layer and the aluminum plate is not high enough, the cracking may occur easily under high temperature and high pressure. Therefore, a silicone printing plate with a high adhesive strength between the silicone layer and the aluminum plate should be selected.
Hot stamping process control
1. Stamping temperature control
The traditional aluminum foil printing plates use copper and zinc plates. Since the thermal conductivity of copper and zinc is relatively high, the hot stamping temperature is generally 70-180°C. The silicone printing plate due to its low thermal conductivity of the surface of the silicone layer, so stamping should be appropriate to increase the stamping temperature, under normal circumstances should be higher than the copper, zinc printing temperature 30-50 °C. Of course, the better the thermal conductivity of the silicone layer, the lower the hot stamping temperature can be adjusted, and the more it will save energy. Therefore, when selecting a silicone printing plate, a silicone printing plate with good thermal conductivity should also be selected.
2. Stamping pressure control
Silicone hot stamping surface uses a lower hardness silica gel layer, which has a certain degree of elasticity, and is more copper in the hot stamping process. Zinc plate makes it easier to compact the galvanized aluminum foil. Therefore, to obtain the same hot stamping effect under the same conditions, the pressure applied to the silicone hot stamping plate should be smaller.
3. Hot Stamping Speed ​​Control
Under the same conditions, the elastic silicone printing plate can compact the electrodeposited aluminum foil in a shorter time than the copper zinc plate. Therefore, the same effect of hot stamping, a new type of silicone hot stamping hot stamping faster.
Of course, in actual operation, the above-mentioned several parameters are not set in stone, but must be selected and set according to actual work needs, such as copper and zinc plate, even stamping pressure, low stamping temperature And the slower hot stamping speed will produce a more ideal hot stamping effect, because the uniform hot stamping pressure makes the anodized aluminum adhesive better, the lower hot stamping temperature makes the anodized aluminum gloss higher, and the slower The hot stamping speed is to accommodate the lower stamping temperature. In short, the hot stamping silicone printing plate used for hot stamping of aluminum is a new type of printing plate that is under development. There may be many other problems during the actual use, and it needs to be further improved by scientific researchers and technical personnel.
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