In the paper packaging industry, screen printing refers to the printing method of making a printing plate with a screen, the text of the printing plate is composed of holes, the printing ink passes through the holes of the screen, forms printing on the surface of the printed matter, and completes the text copy. screen stretching in silk screen printing.
Tighten the net. During the process of clinging the screen to the screen frame. In mass production, we often use the light aluminum frame which is not easy to deform, stable and durable, easy to use and good durability as the mesh frame. The size of the screen frame is larger than the text of the printing plate, at least 10-20cm larger on each side. The beginning and end of the scraper movement shall be at least 10-15cm longer than the printed text.Importance and operation of screen stretching in silk screen printing.
In order to meet the needs of export products, we often use 270-300t yellow polyester screen imported from Japan or Germany in production.For particularly exquisite prints, we often use 350t imported yellow screen to better realize the phased reproduction of patterns. Screen printing uses ultraviolet light when tanning. Importance and operation of screen stretching in silk screen printing.
Blue purple is the mixed reflected light of blue and magenta in the color, that is, the lack of yellow in black. When exposed, the blue purple and the yellow of the screen overlap into black. Therefore, if the yellow screen surface (i.e. the bottom of the emulsion layer) is not sensitive or less exposed, there will be no back tanning, the resulting image has high definition and no faint shadow.Importance and operation of screen stretching in silk screen printing.
In order to save raw materials, we often use binding nets. That is, the longitude and latitude lines of the screen are perpendicular or parallel to the frame. When tightening the net, the tension shall be appropriate, the line shall be consistent, and the tension between the surrounding and the center shall be uniform and stable.Importance and operation of screen stretching in silk screen printing
The specific steps are as follows: first clamp the wire mesh at an equal distance with a clamp, and then send compressed air. When the pressure reaches 6kg, close the air valve to make the wire mesh tension transfer evenly.Importance and operation of screen stretching in silk screen printing.
In this way, tighten and relax, then tighten and relax, repeat two or three times, make the wire mesh fully stretch, and measure the tension around and in the center with a tension meter to be uniform and stable. At this time, the wire mesh adhesive can be used (commonly used acetate latex or epoxy resin adhesive) fix the contact part between the screen and the screen frame.Importance and operation of screen stretching in silk screen printingImportance and operation of screen stretching in silk screen printing.
After drying, fix the excess screen on the other side of the screen frame to prevent the screen from loosening or falling off and prolong the service life of the screen.Importance and operation of screen stretching in silk screen printing.