維勝塑膠

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2022 The 9th China International All India Exhibition

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Precautions for using the printing press

1. Ensure that the receiver is responsible for supervising the safety of machine equipment and crew operators. 2. Before operation, the operators must wear work clothes, work caps and work shoes neatly, fasten the skirts and cuffs, and do not put sundries that are easy to fall out in the pockets, and do not wear watches and various accessories. 3. Before starting the machine, add the required lubricating oil (grease) to each oil filling point, lubricating point and oil tank of the machine. 4. Without approval, non crew members are not allowed to start and operate the machine. Assistants and apprentices should work under the guidance of the receiver. 5. Before starting the machine, check whether there are sundries in all parts of the machine body. First give a signal (press the safety bell), echo back and forth, and confirm that the machine is safe around before starting. 6. Before the machine runs, count the circumference reversely and then count the circumference positively to avoid the damage of blanket and printing plate caused by sundries between rollers. 7. During the operation of the machine, it is strictly forbidden to touch the moving working surface with hands, repair and wipe the machine, cross the rotating parts, and keep the protective device of the machine complete. 8. The crew members shall strictly follow their posts according to the division of labor, pay attention to the operation of all parts of the machine at all times, and stop the machine immediately if problems are found. 9. The work site shall be kept clean and unblocked. The ground, workbench and machine shall be free of sundries. Maintenance tools and spare parts shall be placed at the specified location. 10. When working, no one is allowed to play, play or make noise around the machine. Please keep children away from the machine. 11. At the end of the work, clean the machine, protect the printing plate, clean the blanket, impression cylinder and roller pillow, turn off the power, and fill in the work log. 12. Regular maintenance and repair of the machine and filling in maintenance and repair record data can extend the service life of the machine, improve production quality and safety production. 13. It is forbidden for non staff to operate.

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There are several types of printing presses according to the type of printing plate
Working principle of flat screen curved screen printing machine

Working principle of flat screen curved screen printing machine

Flat screen surface screen printing refers to screen printing with flat screen on cylindrical or conical surfaces. Under certain conditions, it can also screen the oval, drum, arc and other surfaces. Dry screen curved surface screen printing machine is a machine that uses flat screen to print the above curved surface. Working principle of flat surface screen printing machine: a - roller support b - shaft support c - inlaid support. During printing, the flat screen plate and the substrate move while the ink scraper 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. Because of the friction of the screen plate, the substrate placed on the supporting device rotates accordingly. The linear speed of the curved substrate at the embossing line is consistent with the moving speed of the plane screen printing plate to achieve ink scraping printing. In theory, the embossing line should be located at the highest bus of the curved substrate to increase the off screen angle and ensure the printing quality. For the convenience of adjustment, the doctor blade generally adopts a top angle of 60 °± 15 °, and it is required to adjust the verticality and upper and lower dimensions. The adjustment to vertical is to ensure that the cutting edge line will not produce lateral displacement when adjusting up and down, and it is always aligned with the highest bus A; The ink scraper with a top angle of 60 °± 15 ° is used to ensure the obliquity of the ink scraper after vertical installation α。 In the actual adjustment, in order to ensure that the flat screen printing plate and the curved substrate are separated in time, the embossing line can be slightly forward. Especially when the diameter of the substrate is large, the embossing line must be slightly forward. The supporting device for curved surface printing is a special device of various forms, which is designed and manufactured by the user according to the product requirements. Two pairs of roller supports can be used for curved surface printing of cylindrical or conical containers. Shaft sleeve supports can be used for covers and cups with the ratio of length to diameter less than 1.5. Flexible hollow containers can be supported by inflation devices. The elliptical surface is approximately a part of the cylindrical surface, which can be supported by the cylinder 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 plate and the motion form of the screen plate. When making the screen printing plate for the cone surface printing, first draw the development diagram of the cone surface, find out the center of the sector according to the development diagram, and then select the appropriate screen frame to make the screen printing plate. On a plate that can completely contain a sector, a printing plate corresponding to the sector is made. Fix the right angle bar on the plate, and install the shaft into a plate that can be sector rotated. Then, just like the surface printing of the cylinder, four rollers are used to support the substrate under the plate, and the scraper is fixed. Move the plate frame according to the sector shape, and the scraper can be pressurized to print the surface of the conical plate. When printing, the conical bearing printing is in linear contact with the screen printing plate under a certain scraper pressure; When the screen printing plate is horizontally fan-shaped moved around the axis of the fan-shaped development diagram, the substrate rotates synchronously on the support device; The printing ink is squeezed by the scraper, and it skips to the surface of the substrate to complete the printing.

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Printing mode of printing machine

Printing mode of printing machine

(1) Flat press Flat press printing machine: both the plate support and the imprint are flat (2) Circular press Round platen press (platform press): a flat bed cylinder press in which the plate support is flat and the impression is cylindrical. (3) Stop rotary printing machine Stop cyclinder press: the printing plate moves reciprocally. When it moves forward, the printing cylinder rotates for one circle. When it returns, the printing cylinder stops rotating to complete a printing process. (4) One rotary printing machine One turn printing press: a printing machine that completes a printing process by rotating the impression cylinder once every time the single evolution printing press plate table reciprocates. (5) Two rotary printing machine Two rotary printing press: a printing machine that completes a printing process when the two revolution printing press plate table moves back and forth once (6) Reciprocating printing machine Reciprocating printing press: A printing machine that can reverse printing press the printing cylinder to and fro once to complete a printing process. (7) Circular press Rotary printing press: The rotary printing press is a printing machine with cylinder shaped plate support and transfer body, which rotates completely when the printing process is completed. 4. Classification by printing ink type (1) Monochrome printing machine Monochrome printing press: A single color printing press used to print one ink color on one side of the paper during printing. (2) Two-color printing machine Two color printing press: a printing press that prints two ink colors on one side of the paper during the printing process. (3) Multicolor printing machine Multi color printing press: a printing press that prints more than two ink colors on one side of the paper during printing. (4) Double sided monochrome printing machine Double sided monochrome printing press: a printing press that prints on both sides of the paper during the printing process. (5) Two-sided multicolor printing machine Double sided multi-color printing press: a two-sided printing press in which at least two ink colors are printed on one side of the paper during the printing process.

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