Paying attention to these two factors, perfect three-dimensional hot stamping of Greeting Cards!

Paying attention to these two factors, perfect three-dimensional hot stamping of Greeting Cards!

Summary:

The three-dimensional hot stamping process requires two templates, concave and convex, and a high-precision hot stamping machine must be used, otherwise the punch will be damaged. In addition, during the three-dimensional hot stamping process, attention should be paid to the adjustment of two key parameters, temperature and pressure.

The three-dimensional hot stamping process requires two templates, concave and convex, and a high-precision hot stamping machine must be used, otherwise the punch will be damaged. In addition, during the three-dimensional hot stamping process, attention should be paid to the adjustment of two key parameters, temperature and pressure.

  Temperature adjustment

　　 To take temperature adjustment as the key point of three-dimensional hot stamping quality control, strictly control the preheating time, and ensure that the temperature rise and fall are synchronized with the hot stamping speed.

　　The amount of hot melt adhesive applied by the anodized aluminum itself is very small, so if the hot stamping heat it receives is slightly deviated, it will directly affect the transfer quality of the anodized aluminum.

　　 In addition, the metal aluminum layer sprayed on the surface of the anodized aluminum is also very thin (the thickness is only 1-2μm) and is very sensitive to temperature changes, so the hot stamping temperature must be carefully controlled.

　　 But temperature adjustment is not easy to control, so in the actual production process, there are often some quality problems due to fluctuations in the hot stamping temperature. For example, when the hot stamping temperature is too low, the anodized aluminum hot melt adhesive is not fully melted, and it is prone to quality defects such as incomplete hot stamping, sticking, hot stamping, and flickering; when the hot stamping temperature is too high, the surface of the anodized aluminum The aluminum layer will melt again, spatter, and quality defects such as discoloration, surface fogging, and no laser gloss will occur.

　　 In addition, failures such as bubbles, aluminum loss, peeling and delamination have a great relationship with the control of the hot stamping temperature, and the manufacturer should adjust the hot stamping temperature according to the specific manifestations of the quality failure.

  Pressure control

　　 In order to make the three-dimensional hot stamping product comparable to the embossing effect of the simple embossing product, it is necessary to control the embossing quality while ensuring the hot stamping effect.

　　 Because three-dimensional hot stamping is a process that simultaneously completes hot stamping and embossing, its pressure not only affects the adhesion of the anodized aluminum, but also affects the embossing effect. Sometimes there may be an unadjustable contradiction between the two. For example, setting the pressure higher can increase the adhesion of the anodized aluminum to the paper, which is beneficial for hot stamping, but the problem of paper damage may occur during the embossing process.

Therefore, to achieve the best hot stamping effect on the basis of not crushing the paper, it is necessary to carefully set the pressure, and reasonably adjust the height of the hot stamping surface, accurately calibrate the concave and convex bottom molds, and ensure the height of all hot stamps and bottom molds. , The flatness is consistent.

In addition, the quality of the bottom mold must be checked and tracked, especially after the bottom mold has continuously withstood tens of thousands or hundreds of thousands of times of compressive impact, special attention should be paid to the deformation and toughness of the bottom mold. And replace the worn bottom mold in time.

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