1
Hot stamping
There are many reasons for the lack of hot stamping, and the treatment methods are also different. In summary, there are three main types as follows.
â‘ When the hot stamping temperature is low or the pressure is light and the hot stamping is not stable, you can readjust the hot stamping temperature and pressure.
â‘¡During the printing process, the excessive amount of dry oil added to the ink will cause the surface of the ink layer to dry too quickly and cause crystallization, so that the printing foil will not be hot stamped. The solution is to first prevent the occurrence of crystallization during printing. Secondly, if the crystallization occurs, the hot stamping foil can be removed, and the printed product is air-pressed once under heating. The crystal layer is destroyed first, and then the scalding is performed. Printed.
â‘¢ Adding a proper amount of wax-containing desalting agent, anti-sticking agent or non-drying oily substance to the ink will also cause hot stamping. The solution is to stick a layer of highly absorbent paper on the printing plate and air-press it again, after absorbing the waxy and non-drying oil on the background ink layer, and then perform the hot stamping operation.
2
Hot-printed graphics are faint and dizzy
During the hot stamping process, it was found that the graphics and text were false and dizzy, which was mainly caused by the high temperature of the hot stamping and the scorching of the electrochemical aluminum foil. If the hot stamping temperature of the printing plate is too high, so that the anodized aluminum foil exceeds the limit that it can bear, at this time, the anodized aluminum foil will expand to the surroundings, causing dizziness and virtual phenomenon. Scope.
For the scorching of anodized aluminum foil, the main reason is that the shutdown during the hot stamping process is too long, so that a certain part of the galvanized aluminum foil will be in contact with the electrothermal high-temperature printing plate for a long time, and the heated coking phenomenon will occur. Therefore, if the machine is shut down during the production process, the temperature should be reduced, or the electrochemical aluminum foil should be removed. You can also put a thick paper in front of the higher temperature plate to isolate the aluminum foil from the plate.
3
Blurred handwriting
The main reason for this failure is caused by too high hot stamping temperature, too thick anodized aluminum plating layer, excessive imprinting force, and loose installation of anodized aluminum. It is necessary to take corresponding measures according to the specific situation. Excessive hot stamping temperature is the main cause of unclear writing and paste. During the hot stamping process of anodized aluminum, if the printing plate temperature is too high, it will cause the transfer and sticking of the film base and other films, resulting in unclear writing and paste. When hot stamping, the hot stamping temperature should be adjusted lower according to the applicable temperature range of the anodized aluminum foil. In addition, the anodized aluminum with a thin aluminum coating layer should be selected, the appropriate pressure should be adjusted, and the pressure of the pressure roller and the tension of the winding roller should be appropriately adjusted.
4
Graphic edges and text are uneven and unclear
During the hot stamping of anodized aluminum, burrs occur on the edges of graphics and text, which affects the printing quality. The main reasons for this phenomenon are: uneven pressure of the printing plate, mainly due to the uneven layout of the plate during the installation, causing uneven pressure on the layout, some pressures are too large, and some are too small, so that the graphic If the force is uneven, the surface of the aluminum foil is not smooth when hot stamping, and the adhesion between each part and the substrate is not the same, resulting in uneven imprinting. Therefore, the printing plate of the hot stamping anodized aluminum foil must be flat and solid to ensure that the hot stamping pressure is uniform, so as to avoid unclear graphics.
If the pressure of the printing plate is too high during hot stamping, it can also cause uneven printing. At this time, it is necessary to adjust the stamping pressure to an appropriate level. To ensure that the pads of the imprinting mechanism should be accurately fitted according to the area of ​​the pattern, they should not move or move. In this way, it can be ensured that the graphics and the text match the pad layer during hot stamping, and the hair around the graphics and text is avoided. In addition, the pressure of the same plate is uneven after hot stamping. This is because the size of the graphic area is very different. The pressure of the large area of ​​the graphic should be increased. The pressure of the area of ​​the paper can be corrected and adjusted to make it equal. Finally, if the temperature is too high during hot stamping, it will also cause uneven graphics. Therefore, according to the characteristics of anodized aluminum foil, the hot stamping temperature of the printing plate should be reasonably controlled to ensure that the four sides of the graphic are smooth, smooth, and no hair.
5
Graphic and text imprints are incomplete, missing strokes
This failure is mainly caused by the transportation of electrochemical aluminum foil and printing plates. For example, the printing plate is damaged or deformed, which is one of the important reasons for the incompleteness of the graphic imprint. Therefore, if the printing plate is found to be damaged, it should be repaired or replaced immediately. The deformation of the printing plate makes the printing plate unable to bear the applied hot stamping pressure. The printing plate should be replaced and the pressure adjusted. If the cutting and conveying deviation of the electrochemical aluminum foil, the margin of the horizontal cutting of the electrochemical aluminum foil is too small, or the cutting is skewed, and the deviation occurs during the unwinding and conveying, it will make the electrochemical aluminum foil and the printing plate text do not match, and some of the graphics are exposed. incomplete. In order to prevent such problems, the anodized aluminum foil should be cut to make it neat and flat, and the margin size should be appropriately increased. Improper conveying speed and tightness of anodized aluminum foil can also cause this kind of failure.
Electrified aluminum foil feeding and receiving device is loosely shifted, or the loosening of the electrified aluminum foil core and the unwinding shaft, the unwinding speed changes, and the degree of tightness of the electrochemical aluminum foil changes. . At this time, the winding and unwinding device should be adjusted, but if the hot stamping foil is too tight, the pressure of the rolling roller and the tension of the winding roller should be adjusted appropriately to ensure that the electrochemical aluminum foil has a suitable speed and tightness. This problem will also occur when the hot stamping material and the object to be stamped are unsuitable or when too much powder is sprayed during printing, and adjustments should be made. In addition, the printing plate part moves and drops at the position of the bottom plate, the pad of the imprinting mechanism is displaced, etc., so that the normal hot stamping pressure changes and is uneven, which will cause the incomplete imprint of the text. Therefore, during the hot stamping process of anodized aluminum, you should always check the quality of hot stamping, immediately analyze the quality problems, and check the printing plate and liner. If it is found that the printing plate is moving or the padding material is shifted, adjust it in time and put the printing plate and the padding material back in place to fix it.
6
No hot stamping or graphic flower
During the hot stamping, the pictures and texts appear out of print or cannot be stamped at all. The main reasons are:
â‘ The hot stamping temperature is too low, and the hot stamping temperature of the printing plate is too low to reach the minimum temperature required for the anodized aluminum foil to be separated from the film base and transferred to the substrate. During the hot stamping, the anodized aluminum foil is not completely transferred, resulting in the graphic text. Flowers, bare bottoms, or hot stamping will not work. If this kind of quality problem is found, the temperature of the hot plate should be adjusted appropriately in time until the intact printed product is printed.
â‘¡Hot stamping pressure is small. During the hot stamping process, if the hot stamping pressure of the printing plate is too small, and the pressure applied to the anodized aluminum foil is too light, the anodized aluminum foil cannot be transferred smoothly and the hot stamping image and text are incomplete.
â‘¢The background color is too dry, and the surface is crystallized. If the background ink layer on the surface of the substrate is too thick and over-dried, crystallization will occur, which will make the anodized aluminum foil hot stamping impossible. When hot stamping, the dryness of the background color is printed immediately within the printable range. When printing the background color, the ink layer should not be too thick. When the amount of printing is large, it should be printed in batches to appropriately shorten the production cycle. Once the crystallization phenomenon is found, the printing should be stopped immediately, and the printing should be continued after finding and troubleshooting.
â‘£The type of anodized aluminum foil is wrong or the quality is not good. This can also cause problems with the quality of hot stamping. The anodized aluminum foil of appropriate type, good quality and strong adhesion should be replaced. Substrates with a large hot stamping area can be hot stamped twice in a row to avoid blooming, bottoming and hot stamping.
7
Pattern stamping matt
This situation is mostly because the hot stamping temperature is too high, and the temperature of the hot plate should be appropriately reduced. In addition, empty cars should be minimized and unnecessary parking should be reduced, because empty cars and parking will increase the temperature of the hot plate.
8
Hot stamping quality is unstable
Use the same material, but the quality of hot stamping is good or bad. The main reasons are unstable material quality, problems with temperature control of the hot plate, or loose pressure adjustment nuts. The material can be replaced first. If the fault persists, it may be a problem of temperature or pressure. The temperature and pressure should be adjusted and controlled.
9
Bottom leak after hot stamping
The main reason is that the pattern of the object to be ironed is too deep, and the pattern of the object to be ironed should be replaced; if the pressure is too low, the temperature is too low, the pressure can be increased to increase the temperature. All in all, there are many reasons for the hot stamping failure of the anodized aluminum. In addition to the hot stamping temperature and pressure speed, it is also necessary to pay attention to the printing materials or the replacement of the anodized aluminum. It should be carefully analyzed in order to correct the disease and eliminate it malfunction.
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