Working Principle Of Flat Screen Curved Screen Printing Machine

Flat screen curved surface screen printing refers to screen printing with a flat screen on a cylindrical or conical curved surface. Under certain conditions, screen printing can also be performed on curved surfaces such as elliptical surfaces, drum-shaped surfaces, and arc surfaces. The dry mesh curved screen printing machine is a machine that uses a flat screen to print on the above-mentioned curved surfaces.
The working principle of the flat and curved screen printing machine: a-roller support b-axis support c-inlaid support. When printing, the flat screen printing plate and substrate move, while the squeegee remains stationary. The flat screen printing plate is clamped on the screen frame and driven by the flat screen curved screen printing machine to move at a constant speed. Due to the friction of the screen plate, the substrate placed on the supporting device rotates accordingly. At the printing line, the linear speed of the curved substrate is consistent with the moving speed of the flat screen printing plate, achieving squeegee printing.
Theoretically, the printing line should be at the highest bus line of the curved substrate to increase the off-grid angle and ensure printing quality. In order to facilitate adjustment, the squeegee generally adopts a 60°±15° vertex angle, and is required to be able to adjust the verticality and up and down dimensions. The purpose of adjusting to vertical is to ensure that the cutting edge line does not shift laterally when adjusting up and down, and is always aligned with the highest bus line A; the purpose of using a squeegee with a vertex angle of 60°±15° is to ensure that the inclination angle of the squeegee is formed after vertical installation. α. In actual adjustments, in order to ensure that the flat screen printing plate and the curved substrate are separated in time, the printing line can be moved slightly forward. Especially when the diameter of the substrate is large, the printing line must be moved forward. The support device for curved surface printing is Various forms of special devices are designed and manufactured by users according to product requirements.
Two pairs of roller supports can be used for curved printing of cylindrical or conical containers. Bushing supports are used for covers and cups whose length-to-diameter ratio is less than 1.5. Soft hollow containers can be supported by an inflatable device. The elliptical surface is approximately a part of the cylindrical surface and can be supported by cylindrical inlays.
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, you must first draw an expansion diagram of the cone surface, find the center of the fan shape based on the expansion diagram, and then select an appropriate screen frame to make the screen printing plate.
On the plate efgh that can completely accommodate the fan-shaped abed, a printing plate that conforms to 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 rotate 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 scraper is fixed, the plate frame is moved in a fan shape, and the surface of the conical plate is printed by pressing the scraper. When printing, the conical printing plate is in line contact with the screen printing plate under a certain scraper pressure; when the screen printing plate moves horizontally around the axis of the fan-shaped expansion diagram, the printing substrate rotates synchronously on the supporting device. Movement; under the pressure of the scraper, the ink leaks onto the surface of the substrate to complete printing.