Screen printing machine decontamination method details
Screen printing in the use of silk screen production, we can not always avoid the silk screen screen decontamination treatment, but we often use silk screen printing different types of products, resulting in regular dirt on the screen clean unclean, the results Resulting in waste, affecting the printing quality, shorten the template life. Wuxi Jinfeng for everyone to detail about the removal of screen printing screen dirt method.
When the picture printed on the site of dirt or dry ink, the screen should be decontamination treatment, stop the printing press after lifting the network frame, then some operators will be dipped in solvent emery hard wipe The underside of the template, the sound of the entire printing workshop can be heard, often the template damage.
A real knowledgeable operator rarely effortlessly rubs a stencil printing surface because he knows that the clarity of a printed image requires that all graphic edges remain clear with the emulsion layer graphic interface. Hard friction will damage the emulsion layer graphic interface, or even wipe off the emulsion layer, leaving only the bare mesh.
When printing high net line color images, the emulsifier film under the wire is only 5-6um thick, and the mesh itself may have a wire diameter of only 30um, which can not withstand strong friction. Therefore, the key to avoid rough decontamination should first prevent the template from being contaminated.
The main reason for the stencil pollution is the improper ink control, resulting in dry ink left in the mesh. When using solvent-based inks or water-based inks, the reason is that the ink is too thin or too thick. It should be in the state of ink does not change. When using UV-curable inks, care should be taken to prevent the screen from being exposed to UV light and from sunlight.
Another ink control problem with improper printing speed control will lead to uneven supply, so ink-poor mesh dry quickly.
The last cause of the ink drying is that the squeegee is not properly set or has been worn. When printing high-level images with subtle images, it is required that the squeegee be deformed or worn during normal use. The resolution of the image will decrease, which indicates that the ink may not pass through the mesh normally. If this problem can not be solved in time, the ink will dry in the mesh. To avoid this problem, turn the squeegee plate regularly to prolong the service life of its squeegee side, or switch to a new squeegee plate before the print quality has not dropped.
In order to play a normal mesh, but also should pay attention to clean up the ink or substrates on the dirt. Due to electrostatic adsorption of air pollutants and poor storage conditions and other reasons, the substrate surface will be stained with dirt, the above problems can be solved by improving the storage conditions and process control, the other with the addition of static eliminator and substrate decontamination device Prevent the transfer of dirt and dust from the printing surface to the mesh.
If the template is polluted how to deal with it? When using a flatbed screen printing press, stop the printer after printing a set of sheets and enter a blotter to bring the screen into contact with the blotter.
Let the screen in the printing position, and then wiped with a non-abrasive cloth moistened with a mesh cleaner dirt on the ink surface, do not use too much force, so dirt will fall through the mesh The following absorbent paper, if necessary, re-use a piece of absorbent paper to repeatedly clean the mesh. Some dirt particles that fall to the top may be too large to pass through the mesh, but stick with a soft cloth. After cleaning, can use the hair dryer (call "cold") to dry the stencil.
When cleaning a rotary screen printing machine, you will encounter different situations. Due to the design of the structure of the reasons, can not be cleaned as ordinary screen printing machine that dirt washed down in absorbent paper. Fortunately, due to the printing speed is faster, the ink dry in the mesh is unlikely. If this is the case, stop printing at the end of the job, and then dip the screen cleaner or thinner on the top of the template where the graphic is printed with a non-abrasive cloth Solvent scrub mesh dirt.
Sometimes also remove the dirt under the template. In this case, the soft cloth should be gently rubbed the dirt, do not be too hard. In the production process should be frequently used above cleaning decontamination method to extend the life of stencil and screen printing machine, reduce scrap rate.
WUXI JINFENG SILKSCREEN MESH MANUFACTURING CO., LTD.
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