Magnetic suspension ink distributing system and working method

Abstract

The invention provides a magnetic suspension ink distributing system with magnetism, which relates to gravure printing equipment and comprises a primary ink fountain, a secondary ink fountain and a magnetic suspension ink distributing device, the plate cylinder is arranged above the primary ink fountain, the lower end of the plate cylinder is immersed in the ink, and the plate cylinder is a driving part; the magnetic ink distributing roller is in line contact with the plate cylinder, part of the magnetic ink distributing roller is suspended on the liquid level of the printing ink, the magnetic ink distributing roller is attracted to the plate cylinder through magnetic force and is driven by the plate cylinder to rotate, and the magnetic force is 5%-10% of the gravity of the magnetic ink distributing roller. By changing the material of the printing ink roller, weak adsorption force can be generated between the printing ink roller and the plate cylinder, when the plate cylinder rotates, the magnetic ink distributing roller rotates relative to the plate cylinder under the action of magnetic force and adhesive force of printing ink, and then the effects of uniformly mixing the printing ink and eliminating printing ink bubbles are achieved.

Description

Technical Field

[0001] This invention relates to gravure printing equipment, and particularly to a magnetic suspension ink distribution system and its operating method. Background Technology

[0002] Ink distribution rollers are commonly used devices in the printing industry. In gravure printing, ink distribution rollers typically play a role in mixing the ink and eliminating air bubbles. The ink distribution roller needs to float on the surface of the ink and be in linear contact with the printing plate cylinder. The rotation of the printing plate cylinder drives the ink distribution roller to rotate.

[0003] Currently, the ink trough of Bobst gravure printing machines is very small, making it difficult to install the ink distribution roller by mechanical fixation. This leads to printing quality problems during the production process of Bobst gravure printing machines due to printing issues such as dry plate and trailing. Therefore, how to install the ink distribution roller in the narrow ink trough has become an urgent problem to be solved. Summary of the Invention

[0004] This invention provides a magnetic suspension ink distribution system and its working method, which aims to solve the problem of difficulty in installing ink distribution rollers in narrow ink trough spaces.

[0005] To achieve the above objectives, embodiments of the present invention provide a magnetically levitated ink-spreading system, comprising: A primary ink trough is used to hold ink. A printing plate cylinder is positioned above a primary ink trough, with its lower end immersed in ink; the printing plate cylinder is a moving component. A magnetic ink-spreading roller is in line contact with the printing plate cylinder. The magnetic ink-spreading roller is partially suspended on the surface of the ink. The magnetic ink-spreading roller is magnetically attracted to the printing plate cylinder and rotates under the drive of the printing plate cylinder. The magnetic force is 5%-10% of the weight of the magnetic ink-spreading roller.

[0006] Preferably, the average density of the magnetic ink roller is less than the density of the ink, wherein the density of the ink is 0.9-1.05 kg / m³ and the density of the ink roller is 0.8-0.85 kg / m³.

[0007] Preferably, the magnetic ink roller is made of a material that resists ink corrosion.

[0008] Preferably, the viscosity of the ink is 21 seconds.

[0009] Preferably, the linear speed of the printing plate cylinder is 150 meters per minute.

[0010] Preferably, the surface of the printing cylinder is engraved with intaglio cells that reproduce the printed pattern; The primary ink trough is semi-cylindrical, and the axis of the printing plate cylinder is parallel to the axis of the primary ink trough. The primary ink trough has lugs at both ends in the axial direction, and the printing plate cylinder is rotatably mounted on the two lugs.

[0011] Preferably, a secondary ink trough is provided outside the primary ink trough. The secondary ink trough partially surrounds the primary ink trough below it. The primary ink trough and the secondary ink trough are connected at the top. The secondary ink trough is used to hold ink that overflows or splashes from the primary ink trough.

[0012] This application also provides a method for operating a magnetic levitation ink distribution system with magnetism, wherein the printing plate cylinder, as the active component, drives the magnetic ink distribution roller to rotate in a different direction from the printing plate cylinder by magnetic force.

[0013] The above-described solution of the present invention has the following beneficial effects: In this application, by changing the material of the ink roller, a weak adsorption force is generated between the ink roller and the printing plate cylinder. When the printing plate cylinder rotates, the magnetic ink roller rotates relative to the printing plate cylinder under the action of magnetic force and ink adhesion force, thereby playing the role of mixing ink and eliminating ink bubbles.

[0014] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0015] Figure 1 This is a perspective view of the present invention; Figure 2 This is a cross-sectional view of the present invention; Figure 3 This is a schematic diagram of the forces acting on the magnetic ink roller.

[0016] [Explanation of Labels in the Attached Image] 1- Primary ink trough, 2- Printing plate cylinder, 3- Magnetic ink distribution roller, 4- Secondary ink trough. Detailed Implementation

[0017] To make the technical problems, technical solutions and advantages of the present invention clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0018] like Figure 1-3As shown, an embodiment of the present invention provides a magnetically levitated ink distribution system, including a primary ink trough 1 for holding ink. In this embodiment, the primary ink trough 1 is semi-cylindrical. A printing plate cylinder 2 is disposed in the primary ink trough 1, positioned above the primary ink trough 1, with its lower end immersed in the ink. The printing plate cylinder 2 is the driving component. In this embodiment, the printing plate cylinder 2 is driven by a driving component, enabling it to rotate around its own axis of rotation. The axis of the printing plate cylinder 2 is parallel to the axis of the primary ink trough 1.

[0019] A magnetic ink-spreading roller 3 is also provided in the primary ink trough 1, and the magnetic ink-spreading roller 3 is in line contact with the printing plate cylinder 2. In this embodiment, the axis of the magnetic ink-spreading roller 3 is parallel to the axis of the printing plate cylinder 2. The magnetic ink-spreading roller 3 is suspended on the surface of the ink, and the lower end of the magnetic ink-spreading roller 3 is immersed in the ink. In this embodiment, the printing plate cylinder 2 is made of steel, and the magnetic ink-spreading roller 3 can magnetically attract the steel. Under the action of magnetic attraction, when the printing plate cylinder 2 rotates, the magnetic ink-spreading roller 3 and the printing plate cylinder 2 rotate in different directions.

[0020] In this application, the magnetic ink-spreading roller 3, under normal operating conditions, is subjected to its own gravity F1, the buoyancy F2 of the ink on the magnetic ink-spreading roller, the magnetic force F3 generated between the magnetic ink-spreading roller 3 and the printing plate cylinder 2, and the centripetal force F4. The buoyancy and gravity are forces acting in opposite directions. When the buoyancy and gravity are equal, the magnetic ink-spreading roller 3 can float in the ink. The magnitude of the magnetic force is set according to different requirements. The centripetal force is generated based on the printing plate cylinder 2 acting as the active roller, moving with the motor of the printing equipment. During movement, the surface of the printing plate cylinder 2 is coated with ink, which simultaneously contacts both the printing plate cylinder 2 and the magnetic ink-spreading roller 3. The printing plate cylinder 2 generates a centripetal force through the tension of the ink, driving the magnetic ink-spreading roller to rotate in the opposite direction. The relative balance between the magnetic force and the centripetal force ensures that the magnetic ink-spreading roller 3 and the printing plate cylinder maintain contact and reverse movement through the ink as a medium. Simultaneously, the contact force between the two can break air bubbles in the ink, allowing the ink to better enter the gravure cells on the surface of the printing plate cylinder, achieving the purpose of ink uniformity.

[0021] In order to prevent the magnetic ink roller 3 from adhering to the printing plate cylinder 2 and rotating with the printing plate cylinder 2, the magnetic force generated by the magnetic ink roller 3 on the printing plate cylinder 2 is 5%-10% of that of the magnetic ink roller 3.

[0022] In this application, the magnetic ink-spreading roller 3 is suspended on the ink surface and can generate a weak magnetic force with the printing plate cylinder 2. Under the action of this magnetic force, the magnetic ink-spreading roller 3 is provided with rotational power while preventing it from adhering to the printing plate cylinder. The magnetic ink-spreading roller 3 can be installed without the aid of mechanical structures, requiring less space and thus is more suitable for gravure printing equipment with limited space.

[0023] In this application, the average density of the magnetic ink-spreading roller 3 is less than the density of the ink, thereby allowing the magnetic ink-spreading roller 3 to float on the ink. In this embodiment, the density of the ink is 0.9-1.05 kg / m³, the density of the ink-spreading roller is 0.8-0.85 kg / m³, and the viscosity of the ink is 21 seconds.

[0024] In this application, the magnetic ink-spreading roller 3 is made of a material resistant to ink corrosion, such as carbon fiber. During the fabrication of the magnetic ink-spreading roller 3, magnetic powder or magnetic blocks are encapsulated within the carbon fiber material. The amount of magnetic powder or magnetic blocks is determined according to the required magnetic force. In this embodiment, the carbon fiber is fabricated into a hollow roller, and magnetic blocks are filled into the hollow area of ​​the roller to form the magnetic ink-spreading roller 3.

[0025] In this application, the linear speed of the printing cylinder 2 is 150 meters per minute.

[0026] In this application, the surface of the printing cylinder 2 is engraved with intaglio cells that reproduce the printed pattern. Supports are provided at both ends of the primary ink reservoir 1 along its axial direction. The printing cylinder 2 is rotatably mounted on these two supports and is driven to rotate using a driving mechanism based on existing technology.

[0027] A secondary ink trough 4 is also provided below the primary ink trough 1, partially surrounding it. The tops of the primary ink trough 1 and the secondary ink trough 4 are connected to each other, allowing the primary ink trough 1 to collect ink spillage or ink splashing when the printing cylinder 2 rotates too fast. In this application, a liquid level sensor is also provided inside the primary ink trough 1. The liquid level sensor signal controls the ink supply system for supplying ink to the primary ink trough 1, thereby maintaining the liquid level height inside the primary ink trough 1.

[0028] This application also provides a method for operating a magnetic levitation ink distribution system with magnetism: the printing plate cylinder 2, as the active component, drives the magnetic ink distribution roller 3 to rotate in a different direction from the printing plate cylinder 2 by magnetic force.

[0029] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A magnetically levitated ink-spreading system, characterized in that, include: Primary ink trough (1) is used to hold ink; The printing plate cylinder (2) is positioned above the primary ink trough (1) and its lower end is immersed in ink. The printing plate cylinder (2) is a driving component. The magnetic ink roller (3) is in line contact with the printing plate cylinder (2). The magnetic ink roller (3) is partially suspended on the surface of the ink. The magnetic ink roller (3) is magnetically attracted to the printing plate cylinder (2) and rotates under the drive of the printing plate cylinder (2). The magnetic force is 5%-10% of the weight of the magnetic ink roller (3).

2. The magnetic suspension ink distribution system according to claim 1, characterized in that: The average density of the magnetic ink roller (3) is less than the density of the ink, which is 0.9-1.05 kg / m³.

3. The magnetic suspension ink distribution system according to claim 1, characterized in that: The magnetic ink roller (3) is made of a material that resists ink corrosion.

4. The magnetic suspension ink distribution system according to claim 1, characterized in that: The viscosity of the ink is 21 seconds.

5. The magnetic suspension ink distribution system according to claim 1, characterized in that: The linear speed of the printing cylinder (2) is 150 m / min.

6. The magnetic levitation ink distribution system with magnetic properties according to claim 1, characterized in that: The printing cylinder (2) has intaglio cells engraved on its surface to reproduce the printed pattern. The primary ink trough (1) is semi-cylindrical, and the axis of the printing plate cylinder (2) is parallel to the axis of the primary ink trough (1). The primary ink trough (1) is provided with lugs at both ends in the axial direction, and the printing plate cylinder (2) is rotatably mounted on the two lugs.

7. The magnetic levitation ink distribution system with magnetic properties according to claim 1, characterized in that: A secondary ink trough (4) is provided outside the primary ink trough (1). The secondary ink trough (4) partially surrounds the primary ink trough (1) below it. The primary ink trough (1) and the secondary ink trough (4) are connected at the top. The secondary ink trough (4) is used to hold ink that overflows or splashes from the primary ink trough (1).

8. A method for operating a magnetically levitated ink-spreading system, characterized in that: The printing plate cylinder (2), which is the active component, drives the magnetic ink roller (3) to rotate in a different direction from the printing plate cylinder (2) by magnetic force.

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