Professional designer and manufacture of CCD machines for ONE STOP SOLUTION.
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Professional designer and manufacture of CCD machines for ONE STOP SOLUTION.
During the printing process, the phenomenon of pinholes from ink printing is a major headache for those involved in screen printing. In the case of printing opaque objects such as billboards and thick paper, such holes are not easily observable and are usually not a problem. However, when precision printing on aluminum, glass and polyurethane for some high-demand products, pinholes are not allowed when post-treatment and etching are required.
During the printing process, the phenomenon of pinholes from ink printing is a major headache for those involved in screen printing. In the case of printing opaque objects such as billboards and thick paper, such holes are not easily observable and are usually not a problem. However, when precision printing on aluminum, glass and polyurethane for some high-demand products, pinholes are not allowed when post-treatment and etching are required.
In addition, there are many unexplained causes for pinholes in printing inks when they are caused by a variety of factors, some of which may also be quality management issues. Pinhole elimination for printed products is one of the most important inspection items in printed product inspection.
In the following, we will analyze the pinhole phenomenon that often occurs in the printing ink process.
1, the substrate surface cleaning. Aluminum plate, glass plate, acrylic plate, etc. should be pretreated before printing, should be printed immediately. In multi-color printing, the method of alcohol rubbing before printing is generally used. In addition, semi-automatic and fully automatic ultrasonic cleaning machine can be used. After pretreatment, dirt such as grease can be removed, and at the same time, the dust attached to the surface can be removed.
2. Dust and foreign matter adhered to the plate. When making plates, some solvents are mixed in when cleaning and developing. In addition, when the photographic emulsion is applied, dust is also mixed in, which will cause pinholes if attached to the screen. During the test, if you pay attention to the inspection, you can find and fix it in time. If dust and foreign objects adhere to the screen and block the opening of the screen will also cause pinholes. Before official printing, dust can be removed from the sheet after a few prints if a paper with strong ink absorption is used.
3, the detergent development of the cleaning machine often can not be mixed with broken fibers, this traditional detergent dissolved in alcohol, in the cleaning of the substrate surface, often through the formation of a thin surfactant film, in the film when printing electronic ink will lead to the occurrence of a pinhole. Therefore, in the use of system cleaning agents and alcohol to be carried out with special attention. When handling substrates by hand, fingerprints from the hands can also adhere to the printing technology surface and create pinholes when printing.
The above printing pinholes now seem to be ruled out with a little attention, but due to the complexity of printing, many problems need to be dealt with in conjunction with reality.
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