A coup to achieve hot stamping and bumping once formed here
It is well known that bumping and hot stamping applications are most common in various finishing methods of printing surfaces. In recent years, with the continuous improvement of post-press processing technology, equipment and processes, hot stamping and unevenness can be combined into one process under certain conditions, which greatly saves cost, reduces energy consumption and improves efficiency. At present, the hot stamping concave and convex one-time forming process commonly used in the industry is to design the hot stamping and concave and convex patterns on a stencil, and combine the characteristics of the paper to calculate the engraving depth of the embossed plate, thereby realizing one molding. However, the drawback of this is that the plate making is difficult. For products with large format and hot stamping and relative position of the concave and convex, the plate is wasteful and the cost is high. More importantly, if you design 3 or more patterns onto a stencil, the adjustment of the pressure in one part will definitely affect the effect of other parts. To this end, this article will explore how to achieve hot stamping and bumping or even three-dimensional bumping in the case of the hot stamping and embossing.
Proposal of key issues
In order to better interpret the test and application process of this technology, this paper selects the test products containing holographic positioning hot stamping and three-dimensional bump + flat bump as a representative.
According to the traditional processing method, the processing steps of the product should be: printing → hot stamping → bump → screen printing → die cutting. It is not difficult to understand that the only possible way to achieve process integration is to combine hot stamping and bumping. However, in actual production, the processing method between processes is not a simple merger. In flat-press stamping technology, temperature, pressure and speed play a decisive factor in product quality.
In the hot stamping production, in order to complete the perfect transfer of the electrochemical aluminum, in addition to the ideal hot stamping temperature (the lowest and can be printed with clear graphic lines as the standard, can be determined through trial hot), there must be The ideal stamping pressure. The size of the stamping pressure directly affects the adhesion fastness of the electrochemical aluminum. The pressure is insufficient, and the electrochemical aluminum cannot be transferred to the substrate well. It is easy to produce quality problems such as embossing and stenciling; pressure is too large, and the gasket and the substrate are under pressure. The compression deformation is too large, and it is easy to cause quality problems such as imprint adhesion and paste. Generally, the adjustment of the stamping pressure should be based on the fact that the anodized aluminum does not fade and the adhesion is good. On this basis, when the concave and convex work is performed, it is necessary to adjust the pressure, and the pressure of the upper and lower sides of the layout is required to be uniform. From the back of the embossed paper, it is necessary to have a clear concave-convex effect.
When the processing speed is constant, the holographic positioning hot stamping temperature requirement of the product is about 150 °C, and in order to achieve a clear concave and convex image effect, the concave and convex pressure must be greater than the bronzing pressure, but at this temperature, the paper deformation may lead to the post process. Difficulty in processing, even destroying the ink layer on the surface of the paper or affecting the adhesion of the electrochemical aluminum. Therefore, the key issue we need to address is to provide the required temperature for the bronzing version without affecting the embossing conditions.
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