The effective width of the squeegee is usually between 20 MM and 30 MM. The choice of the best effective width is based on the flatness of the substrate, the screen image resolution, and other printing parameters such as squeegee angle, speed, and ink type. When printing high resolution images on flat/smooth substrates, the effective width is small (less than 20mm), high hardness, and fast printing with suitable ink. In uneven, rough substrates, the effective width should be increased (sometimes 30MM) and the hardness should be reduced. The low hardness adhesive can not be flexibly adjusted and should not be excessively bent. You can also use the middle hard side three-layer scraper or double Scraping. In general, the effective width increases, the printing speed decreases, and the printing angle is increased.
The squeegee shape refers to the cross section of the squeegee. Most squeegee shapes are simply square squeegee, and other shapes of squeegee are used for specific printing conditions. For example, hard squeegee performance is better than soft squeegee, but the ability to adapt to the substrate is poor. With diagonal scraping, the printing edge is easily deformed (like a soft-squeegee).
There are three types of squeegee options for printing workers: square scraping (or right-angle scraping), various sloping and round scraping (horn scraping). The wide application of the square scraper can provide the maximum printing pressure, and the printing angle is determined according to the effective width. Diagonal scraping provides maximum flexibility, printing pressure is reduced, and the printing angle is smaller than the set angle. The round scraper is the least adaptable and provides the least printing pressure. The printing angle can be freely set (often the smallest angle). The above reasons will affect the amount of ink.
The knife edge is an important part of completing the four functions of the squeegee. The sharpness of the squeegee is a factor in the initial control of the amount of ink. The sharp blade provides the smallest amount of ink and the finest image. A blunt and round knife edge increases the amount of ink underneath, and at the same time affects the color and line fineness. When printing large areas and simple patterns with clear oil, the change in color and line fineness is not significant. When printing fine lines and four-color dots, with translucent (UV) and transparent ink, you will soon find out the deformation of the knife edge, and compare the first and last prints to determine when the squeegee should be Polished.