Hot Stamping, Compression, Embossing and One-shot Finishing Process Operation
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In the past, our factory took a variety of wine bottle labels and cigarette cases, where the need for hot stamping and embossing, are taken to make two layouts. The need for bronzing pattern plate when the negative figure film after the production of corrosion, concave and convex version of the plate when the positive figure film after the printing plate corrosion, when pressing the concave and convex when the yin concave zinc plate on the machine and then copy the plaster convex template After the concave-convex work can be suppressed, the gypsum duplicated version is not only difficult to do well and is time-consuming, the defect repair is also difficult, and it is extremely easy to wear when the concave and convex are pressed. After the reform, the rubber plaster cloth was used instead of the gypsum duplicating convex stencil, that is, two pieces of rubberized cloth with a size corresponding to the pattern concave zinc plate were affixed on the floor plate with a double-sided adhesive cloth, and a zigzag pattern was better than the pattern. The area is slightly larger, the surface of a piece and should be raised around the pattern is slightly larger about 1.5 cm, after the paste is good according to the thickness of the printing paper and the height of the pressure convex properly adjusted pressure can be normal operation. After the process improvement, although it is simple and time-saving to improve the efficiency of the printing plate and India printing rate, shorten the product cycle, there are many advantages, but often due to the influence of the temperature of the gilding paper to make the local telescopic deformation, resulting in pressure embossed overprint is not allowed The quality is not satisfactory. In particular, designs such as medals, logos, pavilions, and the like often require on-the-spot bronzing and the use of small, embossed lines to outline the outlines and contours of the designs. The quality cannot be ensured and even appears to be inadequate. In order to solve this problem, we have boldly developed and tested repeatedly to better solve the bronzing, press and embossing synthesis, so that hot stamping and embossing are completed once.

The combination of bronzing and embossing and embossing combines the bronzing area pattern and the embossing pattern between yin and yang to form an organic whole film base plate. After special processing, it undergoes printing and etching to obtain bronzing and embossing plates. In the convex part of the finished product, the zinc plate is recessed, the finished product requires a recessed part, and the zinc plate is convex. Now the process is described as follows:

Bronzing, embossed version of the film synthesis: photographers according to design requirements, the first draft of the original yin and yang cross-line after the cross-line photographed as negative 1 and then by the negative 1 normal copy, development, fixing obtained a positive figure 2, still after Copying from negative image 1, the exposure time is several times longer than that of normal exposure positive image 2. After the development and fixation, a rough picture 3 of the outer contour line is obtained, and then the outline of the positive figure 3 is filled with black ink, and after the positive picture 3 is dried, the copy is used to develop more with less exposure. Method to copy out the outline of the transparent negative 4, then again the positive figure 2 and negative figure 4 synthesis, that is, the overlap of the two films of the yin and yang cross stitched together with adhesive tape, directly used for printing, corrosion produced Bronzing, pressure convex plate. It is also possible to obtain a sheet with a well-defined outer profile after the film is overlocked and overcast, and then obtain a bronzing and embossing version with a positive version of the positive version. From the printed zinc plate image, it is required that the bronzing protruding lines and the outer edge of the pattern have a thin solid line. This is a very important part of the process of hot foil stamping and embossing, and it is mainly used for hot stamping and non-bronzing. The use of cutting, at the same time as if there is a requirement for the convex edge around the pattern, the thin solid line is convex after corrosion, and on the hot stamping, embossing, the part of the paper is concave, and visually The concave edge to the part brings out the effect of the convex part.

Bronzing, embossing of the printing plate: the synthetic shaped bronzing, embossing on the negative film pattern on the sun to the zinc plate, after washing, dyeing, hardening film. After 190 °C high temperature baking and layout finishing.
Bronzing, embossing version of the corrosion: 1 shallow corrosion, the high-temperature baking and trimming good zinc plate in 6 · Bc nitric acid solution, using a brush for shallow corrosion treatment, according to the thickness of the printing paper, determine the convex pressure The height to determine the depth of shallow corrosion in order to achieve the pre-rot effect. The general depth of corrosion is about 0.1 mm 0.2 mm. Can meet the 80-150 grams of paper bronzing, embossing requirements. If the paper is over 250 grams. Hot stamping, embossing depth of corrosion can also be deeper. 2 Partially fill the coating, after the shallow corrosion meets the requirements, take it out and rinse it out with clean water, then n anti-corrosion adhesive to seal the lines and patterns that need hot stamping and embossing, to achieve the protection of the screen. 3 Deep Corrosion: Fill the covered zinc plate. Installed in no powder erosion machine. In accordance with the normal corrosion time and requirements of construction operations, the edge of the corrosion depth is generally about 0.6-0.65 mm.

Hot Stamping, Embossing and Loading: Before plating, the surface of the electric plate should be cleaned, and some marks should be marked on the hot stamping and embossing zinc plate on the back of the stamping plate. A piece of coated white plastic (or leather glue) is slightly larger than the zinc plate. The cloth is attached to the electric plate according to the determined zinc plate position and printing mode, and then the zinc plate is pasted on the electric plate, put some hard paper on the bottom platen, and the power is turned on. 80-90°C, hot-press for about 15 minutes, so that the zinc plate is firmly affixed to the hot plate. After the zinc plate is firmly bonded, paste a 100-gram coated paper on the base plate with transparent adhesive tape and touch it with carbon paper. Embossed samples are used as moments, and another 23 sheets of 250 g whiteboard paper slightly larger than the printed image are cut, and the overlapping adhesive is firmly flattened, then pasted to the position of the printed sample, and the printed sample is peeled off. Coated paper. After 250 g of whiteboard paper is stuck on the bottom platen, the top whiteboard paper is wetted with a wet towel, and the bottom platen is pressed with pressure until the surface of the whiteboard paper is imprinted with marks of various levels. It should be noted that it is necessary to prevent the whiteboard paper pad from being oversized, or the pressure is increased, so that the surface does not have to be hot stamped and the concave and convex portions are higher than the hot stamping and embossing portions, so that the non-bronzing and embossing are made. The parts were also hot ironed, affecting the appearance and quality of the picture.

Bronzing, embossing temperature control: bronzing, embossing is a job completed, so the bronzing temperature is higher than the temperature when the bronzing alone; temperature is generally controlled at about 150 °C.

Hot stamping, embossing pressure adjustment: When the official boot bronzing, embossing operations, but also need to re-check the adjustment pressure, layout requirements are uniform from top to bottom, when viewed from the back of the embossed paper, as long as there is a clear level of convex can boot normal Bronzing, embossing. Because the foil stamping and embossing plate is secondary corrosion, the recessed surface is relatively uneven during the etching. When the stamping is performed, a layer of elastic film such as a plastic film may be properly covered according to the situation, so as to make up for the unevenness and cause the hot stamping to not occur. The drawbacks of electrification of aluminum.

Practice has proved that hot stamping, embossing and concave-convex synthesis is a one-time completion process with satisfactory results, reliable quality, and simple operation, improving work efficiency, shortening cycle, reducing labor, reducing consumption, and increasing benefits.


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