The squeegee leakage in the printing process of flexible printing equipment is a very common problem. There are many reasons. If the processing is not good, the combination of various details and improper operations can also cause the squeegee to leak ink or even fail to print. 1. Insufficient closing pressure may leave a tiny gap between the doctor blade and the anilox roller, which causes excessive varnish to remain on the roller and thus be applied to the printing plate, and when the printing press is stationary Varnish will leak out. 2. One or two scraper blades, possibly seals or blade clamps, have been worn or contaminated. These parts should be checked once a week and cleaned as needed. If you do not apply varnish for any period of time, you should tilt the cavity and lubricate the seal. If the blade wear is excessive, it may be necessary to use different types of blades such as synthetic, long-life or ceramic, or use non-segmented blades if quality standards permit. The causes of abrasion that should be avoided are abrasive pigments (such as titanium oxide in water-based opaque white paint; UV opaque white paint can be used as a substitute) and anilox rollers with incorrect surface finishing or with abrasive engraving patterns. 3. The speed of the printing machine may be too high, causing turbulence and cavitation of the varnish (the formation and collapse of the low-pressure area in the flowing liquid), which pushes the scraper blade back instantly. Oil smearing is a phenomenon that can occur on both the upper and lower doctor blades, even when the seal is tight and the doctor blade has sufficient pressure. The leak is not its cause. 4. If the combined pressure of the blades is too high, the two scraper blades will bend in their length direction, so that the side of the blade instead of the blade is in contact with the roller. Attempting to repair this loosening of the contact line by increasing the compression pressure will only make the problem worse. 5. The open engraved part of the anilox roller (ART, ART-TIF) has no mesh wall, so it cannot form a tight seal with the scraper. Therefore, even when the printing press is stationary, the low-viscosity varnish may leak out. 6. Excessive pressure (filling pressure) in the scraper cavity may push the varnish out of the cavity. 7. Centrifugal drift may occur on the shadow roller, especially when the anilox resolution is less than 50 lines? Inches and when using low viscosity varnish. The centrifugal force drives the varnish along the endless grooves, causing the varnish to gather at one end. It is recommended to use different engraved parts and varnishes with higher viscosity. If the varnish does not properly wet the ink, or if there is not enough varnish, or if the level of the varnish in the squeegee cavity is uneven, ghosting may occur even if the squeegee is in the correct position These problems can also cause uneven application of varnish. Single Motor Table Lifting Frame Motor lifting table frame is a kind of table frame can be controlled by motor lifting, mainly used in office, family and other occasions. According to different characteristics and uses, single motor lifting table frame can be divided into the following categories: Single Motor Table Lifting Frame,Lifting Table Stand,Electric Lifting Table Frame,Lift Table Frame Suzhou Herstar Medical Technology Co., Ltd. , https://www.htstandingdesk.com
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Causes of Leakage in the Blade of Flexo Printing Machine