How To Improve The Quality Of Flat Embossed Hot Stamping?

 

1). Install the balanced pressure version

In actual production, it is not unfamiliar to install a balance knife on the die-cutting plate, but it is not common to install a balance device on the bronzing plate. According to our practice, on Yuancheng 1060 and other large-format die-cutting and bronzing machines, if only the first half of the layout is equipped with a bronzing plate, it is best to install two waste bronzing plates in the blanks on both sides behind the bronzing plate. These two waste bronzing plates can play a role in balancing the pressure. It has a good preventive effect on reducing the "gold deficiency" caused by slight pressure changes in hot stamping. When the balanced pressure version was not installed in our factory at first, it was in the process of continuous production of 2-barrel boxes. It is found that when the temperature and pressure are suitable, there are discontinuous and irregular gold shortages at the rear edge of the hot stamping image. The problem was solved by adding two scrap foil stamping plates to the rear to equalize the pressure.

 

2). Paste the sponge next to the embossed bronzing plate

After the concave and convex bronzing plate is installed on the honeycomb plate, a 1-1.5cm thick sponge should be attached to the edge of each small concave and convex bronzing plate. These sponges can accelerate the separation of anodized aluminum and paper during the hot stamping process and reduce the shortage of anodized aluminum paste. The effect of using this method is better than turning on the separate blowing device on the bronzing machine, because the blowing easily cools the first half of the layout, resulting in unstable temperature and a lack of gold. Moreover, these sponges can also play the role of flattening the paper when they are attached to the blanks between the concave and convex hot stamping plates, which is also helpful to improve the hot stamping accuracy.

 

When our factory equipment produces a 12-unit small box fine bag, there are both text and lines in the embossed hot stamping graphic. We used domestic anodized aluminum at that time, and the control of hot stamping temperature is relatively high. After the temperature is increased, the lines are Part of the easy-to-paste version, the text part is prone to lack of gold after the temperature is lowered. Later, we pasted a sponge next to the concave and convex bronzing plate, and controlled the temperature to be suitable for the text part, which solved the problem better.

 

3). Use a soft backing

Because the bottom mold material used in concave and convex hot stamping is hard resin, it is easy to sag due to pressure and wear during the production process, resulting in a lack of gold. Applying a film to the resin master as a soft backing alleviates this problem. Because doing so can make the resin plate more conducive to the close adhesion of the paper and the concave and convex bronzing plate, and reduce the occurrence of gold shortage. Moreover, it is more convenient and accurate to apply local pressure between the film and the resin master. After adding an extra layer of film, the printing durability of the embossed stamping plate and the resin negative plate is also greatly improved.

 

The picture below is the product picture generated by this machine.