Large scale projection type printing-down apparatus

Abstract

The invention relates to a large scale projection type printing-down apparatus, which comprises a tube and a lampshade. The tube is arranged in the lampshade. The printing-down apparatus also comprises a printing-down frame, elevating devices, a turning device, a backboard, and a vacuumizing device. The printing-down frame is in a rectangular shape, glass is arranged in the printing-down frame, four corners of the printing-down frame are provided with elevating devices, the elevating devices press the backboard on the glass tightly; the backboard is provided with a suction hole; the suction hole is connected to the vacuumizing device, which extracts the air between the backboard and the glass; the printing-down frame is installed on the turning device, the turning device converts the horizontal printing-down frame into a vertical state; and the lampshade is arranged on one end of the turning device and is right opposite to the vertical printing-down frame. The tube and the printing-down apparatus are separated, the heat dissipation is good, the exposure area is enlarged through the projection mode, the UV diffraction is avoided, the exposure effect is good, the image distortion isavoided, fine lines can be manufactured, and the printing-down apparatus is suitable for large scale printing-down. Furthermore, the printing-down apparatus has the advantages of simple structure, reasonable design, low cost, simple operation, convenience, and high safety.

Description

technical field [0001] The invention relates to a printing machine, in particular to a large-scale projection printing printing machine. Background technique [0002] The existing desktop printing machine adopts a box-type design. The exposure lamp is placed under the printing body, and the screen plate is placed on the glass above the printing machine. When exposing, cover the rubber plate cover and vacuumize, so that the screen plate The film is closely attached to the glass of the printing machine, and the light source is irradiated from the bottom to the top during exposure to perform the exposure work; such as a printing machine disclosed in Chinese patent CN204936414U, including a workbench, a cover plate and a light source, the working surface of the workbench is On the light-transmitting surface, the cover plate can be turned over and connected to the working surface around one side of the working surface, and the light source is arranged under the light-transmitting...

AI Technical Summary

Problems solved by technology

Because the traditional plate-making machine adopts a box-type design, the light is enclosed in the light. During the exposure process, the high temperature generated by the lamp cannot be completely eliminated, which is not conducive to cooling. The box-type design of the plate-making machine is small in size and the effective exposure area Limited, unable to meet the needs of making ultra-large screen plates, such as using a large box-type design of the plate-making machine, the cost is high, the workmanship is complicated, and the feasibility is low

[0003] With the increasing market demand for decorative glass and printed glass for large passenger cars, the traditional process uses a small desktop printing machine to make a large screen, because the effective exposure area of ​​the desktop exposure machine is small, the printing needs to be carried out in multiple times, the printing process The film cannot be vacuumed, the film cannot be closely attached to the screen, and the strong ultraviolet light of the exposure machine produces diffraction, and the parts that should not be exposed are irradiated by ultraviolet rays.

After the photosensitive emulsion is irradiated by strong ultraviolet light, a photochemical reaction occurs, the photosensitive emulsion is cured, and then the developing process (mixing the two fluids with high-pressure water and air to spray the exposed screen printing surface) should have been washed clean. Exposure emulsion, because of the diffraction of the light source, cannot be washed clean, the fine lines cannot be completely developed, the graphics are distorted, and the fine line production of the screen plate encounters a bottleneck

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