Screen printing screen frame in screen-printing machines are available in many sizes, shapes and characteristics. Screen printing screen frames consist of several different materials, mainly wood, aluminum, magnesia and steel. Regardless of their composition, shape or style, all screen frames perform equally important functions in screen printing. All in all, these features include the following sections:
1, to provide support for wire mesh tools;
2, to withstand the tension of elastic screen;
3, to withstand the external force in printing;
4, keep flat and square;
5, to be light enough to facilitate handling.
Printers in the screen printing elements of concern, the screen printing screen frame is more important than other elements. It is good or bad to evaluate its anti-tension size. The web tension is measured in N / cm (Newtons per centimeter) and the tension at 1 N / cm is equal to 0.22480894 lbs / cm (pounds per centimeter). Assuming that a 40x40 inch screen reaches a tension of 20 N / cm, this will result in approximately 455 pounds of tension per side of the screen frame, ie 40 in. X 2.54 cm / in. 20 N / cm x 0.22480894 lbs / N = 456.8 lbs. As the size of the frame increases, the pulling force applied increases proportionally. A 60 x 80 in. Screen has a tension of 20 N / cm, a 915 lb pull on the long edge and a 685 lb pull on the short edge.
Once the tension is applied to the screen printing mesh, the screen is stretched tight on the Screen printing screen frame, and the flatness of the screen printing screen becomes an important factor. Screen printing screen frame is a "potential energy" in screen printing, and the role of a screen box is to resist the forces from tension. A suitable screen-printed screen frame will resist tension without distortion during the required printing time and will remain flat and square.