Introducing the basic process of screen printing mesh today(2)
The last article introduced the first and second steps of the basic steps of screen printing. Now I will introduce the third and fourth steps in the back. If you read these two articles, what else do you understand? Feel free to contact us and we will answer you as soon as possible. If you have other products, you can browse our website and find the products you need. If you want to quickly find the products you need, please contact our customer service.Screen Printing Mesh
Large-format mechanical stretcher can be used to obtain large tension, prevent tension slack during printing, and screen deformation; the tension of the same set of screens should be consistent; oblique stretch net, mesh warp and weft and frame are 22.5 ° clip The corner helps to reduce the defects of the dot, making the small text and lines perfect. When stretching the net, the initial tensile force should be large, and the net should be pulled once every 1 hour. After 12 hours, the tension of the screen should be measured with a tensiometer. The difference in tension between the parts is not more than 1 N/cm (the tension after the screen printing is 24 to 25 N). /cm). In addition, aluminum alloy or steel mesh frames should be used, and the wooden frame is easily deformed after being immersed in water.
4, screen production
Take the direct legal plate as an example. After the pretreatment of the screen, the high resolution sensitizer is used, the squeegee surface is coated twice, the printing surface is coated once, and the printing surface is laid down (should be in a dust-free environment); then, at a suitable temperature ( Drying is generally completed within 35~45°C), the measured tension is not less than 18 N/cm; the thickness of the photosensitive layer is controlled at 10~18μm, the thickness of the emulsion layer on the printing surface is about 10% of the thickness of the screen, and the Rz value is rough. Degree) is less than the thickness of the emulsion layer. During the coating process, it is very necessary to control the thickness of the screen. When the thickness is too thick, the dark layer cannot be separated, and the highlight is not printed. The rough screen is uneven, which will cause the dot to increase abnormally and the color tone to change. These data can be controlled by instrumental measurements.
I hope that my two articles can help the customer and answer the customer's questions about the product. We will always be here.