Common faults and solutions in the hottest pad pri

2022-08-18
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Common faults and solutions in pad printing (I)

pad printing is one of the special printing methods. It can print words, figures and images on the surface of irregular objects. Now it is becoming an important special printing. For example, this printing method is used for the text and patterns on the surface, and the surface printing of many electronic products, such as computer keyboards, instruments, meters, etc., is completed by pad printing

the pad printing process is very simple, using steel (or copper, thermoplastic) intaglio, using a curved surface pad printing head made of silicone rubber material, dip the ink on the intaglio into the surface of the pad printing head, and then press it on the surface of the desired object to print words, patterns, etc

there are often many printing faults in pad printing. This paper summarizes the common faults in pad printing process, and arranges them into a comprehensive collection of pad printing faults

one of the common faults: the lines and words of the printed matter are not clear and fuzzy

possible causes and solutions: the pad printing head is too soft. Use a slightly harder pad printing head. The shape of the pad printing head is improperly selected. Try to corrode the gravure with a pad printing head of another shape. The corrosion of the gravure is inaccurate. Make a piece of gravure again. The corrosion depth of the gravure is too deep. Re corrode a piece of gravure with the appropriate depth. The type of gravure material is improperly selected. Choose the appropriate type of gravure (for example, replace the polyester plate with a steel plate) Screen selection is improper. Choose another screen for brittle metal. Try the ink. The ink is too viscous. Add some diluent to the ink. The ink is too thin. Reduce the amount of diluent in the ink. Recently, Europe has also modified the standard of its headlights. The drying speed is too slow. Change a thinner with faster drying speed. The surface of the printing material is not clean. Clean the surface of the printing object in advance. The surface is hard to avoid the formation of air on the surface of the rotor and the mold cavity If possible, change a new material. Or try a pad printing head with high hardness. The surface concave convex degree is severe. The pad printing head and pad printing head base device with special shape are used to print on the edge of the object. The fixture must be able to prevent the pad printing head from sliding. Other possible reasons are that the workpiece fixture is not stable enough. Changing a new workpiece fixture for high-speed printing will lead to deformation of the pad printing head and reduce the printing speed. If necessary, pause for a while before the ink is ready to transfer, in order to recover the deformation of the pad printing head. The second common fault: the adhesion of the ink is up to and it is difficult to build your own brand. It is not required.

this fault is very common in pad printing, because you do not know the formula of the ink, or it may be that the selected ink type is incorrect

possible causes and solutions: there is too much silicone rubber on the surface of the pad printing head. Before using the new pad printing head, clean the new pad printing head with alcohol solvent to corrode the gravure. The corrosion degree of the gravure is too deep. Make a piece of gravure ink with moderate depth. The type of ink is not appropriate. Select the appropriate ink according to the specific situation of the printing material. Select double ink. If double ink is selected, The proportion of printing ink and hardener (hardener) of pad printing head with greater hardness should be used. If the proportion of printing ink and hardener is incorrect, weigh the amount of printing ink and hardener according to the ratio, and then re mix the ink. The surface of the printing material is not clean. Clean the surface of the object with alcohol solvent before printing. For other reasons, the pre-treatment work is insufficient or there is no pre-treatment inspection and pre-treatment procedure. If possible, the repeated pretreatment work does not meet the requirements of the fixing time. Before the pre-test ink is combined firmly, the printed matter can be fully dried. The fixed post-treatment work does not fully use the hot pipe, and sometimes the third common fault of the flame drying device is required: there are obvious pinholes on the printed matter

if the small pinholes are large and appear in the same position on the printed matter, Then check the image on the pad printing head and gravure. If necessary, replace the pad printing head and gravure

possible causes and solutions: the surface of the pad printing head is damaged. Replace the pad printing head, or adjust the position of the pad printing head so that the damaged part will not affect the pad printing image. The surface of the pad printing head is too flat. Change a pad printing head with a slightly sharp shape. The hardness of the pad printing head is not enough. Change a pad printing head with a harder hardness to corrode the gravure

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