The working principle of flat screen curved screen printing machine

Flat screen curved surface screen printing refers to screen printing with flat screens on cylindrical or conical curved surfaces. Under certain conditions, it can also screen print ellipse, drum, arc and other curved surfaces. The dry-net curved screen printing machine is a machine that uses a flat screen to print the above-mentioned curved surface.

The working principle of the flat surface screen printing machine: a-roller support b-shaft meeting support c-inlaid support. During printing, the flat screen printing plate and the substrate move, while the squeegee is stationary. The flat screen printing plate is clamped on the screen frame and the flat screen curved screen printing machine moves at a constant speed, and the substrate placed on the supporting device rotates due to the friction of the screen. The linear speed of the curved substrate at the impression line is the same as the moving speed of the flat screen printing plate to achieve scraping printing.

Theoretically, the embossing line should be at the highest busbar of the curved substrate to help increase the off-screen angle and ensure the printing quality. In order to facilitate adjustment, the squeegee generally adopts a top angle of 60°±15°, and it is required to be able to adjust the verticality and the upper and lower dimensions. The adjustment to vertical is to ensure that the cutting edge line does not shift horizontally during up and down adjustments, and is always aligned with the highest bus A; the squeegee with an apex angle of 60°±15° is used to ensure that the squeegee inclination is formed after vertical installation α. In the actual adjustment, in order to ensure that the flat screen printing plate is separated from the curved substrate in time, the impression line can be slightly forwarded, especially when the diameter of the substrate is large, the impression line must be offset forward. The support device for curved printing is Various types of special devices are designed and manufactured by users according to product requirements.

Cylindrical container or conical container can be printed with two pairs of roller bearings, sleeve bearings for caps and cups with a ratio of length to diameter less than 1.5, and flexible hollow containers can be supported by inflatable devices. The ellipse is approximately a part of a cylindrical surface, which can be supported by a cylindrical inlay method.

The principle of printing on the surface of a cone is basically the same as that of printing on the surface of a cylinder. The difference is the graphic shape of the screen printing plate and the movement form of the screen printing plate. When making a screen printing plate for printing on the surface of a cone, first draw an expanded view of the cone surface, and find the center of the sector based on the expanded view, and then select an appropriate screen frame to make the screen printing plate.

On the plate efgh that can completely contain the fan-shaped abed, a printing plate that matches the fan shape is produced. Fix the right-angle rod on the plate efgh, and install it with o as the axis to form a plate that can be rotated in a fan shape. Then, just like printing on the surface of a cylinder, 4 rollers are used to support the substrate under the plate, the squeegee is in a fixed shape, and the plate frame is moved in a fan shape, and the squeegee is pressurized to print on the surface of the conical plate. During printing, the conical bearing is in line contact with the screen printing plate under a certain squeegee pressure; when the screen printing plate moves in a horizontal fan shape around the axis of the fan-shaped expansion drawing, the substrate rotates synchronously on the supporting device Movement; the ink is squeezed by the squeegee and leaks to the surface of the substrate to complete the printing.