Examples and solutions of the most common electric

Examples and solutions of common electrical faults in aluminum foil hot stamping

1 Poor hot stamping. There are many reasons for poor hot stamping and different treatment methods. To sum up, there are mainly three kinds

① when the hot stamping is not firm due to low hot stamping temperature or light pressure, the hot stamping temperature and pressure can be adjusted again

② in the printing process, excessive dry oil is added to the ink, which makes the surface of the ink layer dry too fast and crystallize, so that the printing foil cannot be hot stamped. The solution is to first try to prevent crystallization during printing. Secondly, if crystallization occurs, remove the hot stamping foil, press the printed matter in the air under heating, and destroy the crystallization layer before hot stamping

③ adding an appropriate amount of waxy diluent, anti sticking agent or non drying oily substances to the ink will also produce poor hot stamping. The solution is to first stick a layer of absorbent paper on the printing plate and air press it again, and then carry out hot stamping operation after adsorbing the wax and non drying oil on the bottom color ink layer

2. Hot stamping pictures and texts are weak and dizzy. In the process of hot stamping, it is found that the graphics and texts are weak and dizzy, which is mainly caused by the high hot stamping temperature and the coking of electrochemical aluminum foil. If the hot stamping temperature of the printing plate is too high, making the electrochemical aluminum foil exceed the tolerable limit, at this time, the electrochemical aluminum foil will expand around, causing dizziness and virtual phenomenon. The temperature must be adjusted to the appropriate range according to the characteristics of the electrochemical aluminum foil

for the coking of electrochemical aluminum foil, the main reason is that the machine is shut down for too long during the hot stamping process, so that a part of the electrochemical aluminum foil can make full use of the obvious characteristics of graphene, and the phenomenon of thermal coking occurs when it is in contact with the electrothermal high-temperature printing plate for a long time, and the graphics and texts will be dizzy after hot stamping. Therefore, in case of shutdown during the production process, the temperature should be reduced, or the electrochemical aluminum foil should be removed, or a thick paper can be placed in front of the printing plate with higher temperature to isolate the electrochemical aluminum foil from the printing plate

3. The handwriting is blurred and pasted. The main reasons for this failure are too high hot stamping temperature, too thick anodized layer, too much embossing force, and the relaxation of anodized installation. Corresponding measures should be taken according to the specific situation. High hot stamping temperature is the main cause of illegibility and plate pasting. In the process of anodized hot stamping, if the printing plate temperature is too high, it will cause the transfer and stickiness of film base and other film layers, resulting in illegibility and plate pasting. When hot stamping, the hot stamping temperature should be appropriately reduced according to the temperature range of electrochemical aluminum foil. In addition, select electrochemical aluminum with thin aluminum coating, adjust the appropriate pressure, and appropriately adjust the pressure of the rolling drum and the tension of the winding drum

4 the operation of recycled plastic granulator touches on a wide range of areas of the national economy The edges of pictures and texts are uneven and unclear. During anodized hot stamping, rough edges occur at the edges of pictures and texts, which affects the printing quality. The main reasons for this phenomenon are: the pressure of the printing plate is uneven, which is mainly caused by the uneven layout when loading the plate, resulting in uneven pressure everywhere on the layout. Some of the pressure is too large, and some of the pressure is too small, so that the graphics and texts are not evenly stressed, so the surface is not smooth when hot stamping electrochemical aluminum foil, and the adhesion between each part and the substrate is different, resulting in uneven imprinting. Therefore, the printing plate for hot stamping electrochemical aluminum foil must be leveled and padded to ensure uniform hot stamping pressure, so as to avoid unclear pictures and texts

if the pressure of the printing plate is too high during hot stamping, it can also cause uneven graphic imprinting. At this time, it is necessary to adjust the hot stamping pressure to an appropriate level. To ensure that the pad of the imprinting mechanism should be accurately fitted according to the area of the pattern, without displacement and good movement. In this way, we can ensure that the pictures and texts coincide with the cushion layer during hot stamping and avoid hairiness around the pictures and texts. In addition, the pressure of the same plate after hot stamping is uneven, because figure (8) the area of the bidding document for the largest range of EMUs launched by China Railway Corporation in 2015 is very different. The pressure of large-area graphics and text should be increased, and the pressure of large and small areas can be corrected and adjusted by means of paper padding to make it equal. Finally, if the temperature is too high during hot stamping, it will also cause uneven image and text imprinting. Therefore, we should reasonably control the hot stamping temperature of the printing plate according to the characteristics of electrochemical aluminum foil, so as to ensure that the four sides of the picture and text are smooth, flat and hairless

5. The image and text imprint is incomplete, incomplete and broken. This fault is mainly caused by electrochemical aluminum foil conveying, printing plate and other reasons. For example, the printing plate is damaged or deformed, which is one of the important reasons for the incomplete image and text imprinting. Therefore, if the printing plate is found to be damaged, it should be repaired or replaced immediately. The plate deformation makes the plate unable to withstand the applied hot stamping pressure. Replace the plate and adjust the pressure. If the electrochemical aluminum foil is cut and transported with deviation, the edge left during the horizontal cutting of the electrochemical aluminum foil is too small or the cutting is skewed, and the deviation occurs during the unwinding and transportation, the electrochemical aluminum foil will be inconsistent with the printing plate graphics and text, and some graphics and text will be exposed, resulting in incomplete. In order to prevent such problems, the electrochemical aluminum foil should be cut neatly and smoothly, and the size of the left edge should be appropriately increased. Improper conveying speed and tightness of electrochemical aluminum foil will also cause this kind of fault

the feeding and receiving devices of electrochemical aluminum foil are loose and displaced, or the winding core of electrochemical aluminum foil is loose and loose between the winding shaft, the winding speed changes, and the tightness of electrochemical aluminum foil changes, which makes the hot stamping position of graphics and texts deviate, resulting in incomplete graphics and texts. At this time, the winding and unwinding device should be adjusted, but if the hot stamping foil is too tight, so there is no conversion relationship, the pressure of the crimping drum and the tension of the winding drum should be adjusted appropriately to ensure that the electrochemical aluminum foil has appropriate speed and tightness. This kind of failure can also occur if the hot stamping material is not suitable for the hot stamping object or too much powder is sprayed during printing. Attention should be paid to adjustment. In addition, the position of the printing plate on the bottom plate moves and falls, and the pad of the imprinting mechanism shifts, which changes the normal hot stamping pressure and causes the incomplete image and text imprinting. Therefore, in the process of anodized hot stamping, we should often check the hot stamping quality, and immediately analyze the quality problems found, and check the printing plate and liner. If the printing plate moves or the liner is displaced, adjust it in time, and put the printing plate and the liner back in place for fixation

6. Hot stamping is not available or the graphics and texts are scratched. During hot stamping, the graphics and texts appear to be flowered and exposed or cannot be hot stamped at all. The main reasons are:

① 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 electrochemical aluminum foil to separate from the film base and transfer to the substrate. During hot stamping, the electrochemical aluminum foil is not completely transferred, resulting in the graphics and texts to be flowed, exposed or hot stamped. If this kind of quality problem is found, the temperature of the electric heating plate should be adjusted appropriately in time until a good print is produced by hot stamping

② low hot stamping pressure. During the hot stamping process, if the hot stamping pressure of the printing plate is too small and the pressure applied to the electrochemical aluminum foil is too light, the electrochemical aluminum foil cannot be transferred smoothly, making the hot stamping pictures and texts incomplete. At this time, the hot stamping pressure should be increased.

③ the background color is dry