Intaglio printing apparatus and intaglio printing method

Abstract

This invention relates to the field of printing apparatus technology, specifically a gravure printing apparatus. The apparatus includes a frame with an ink tank, an ink-dipping roller, an ink transfer assembly, and a liner roller. The ink transfer assembly includes a first printing roller and a second printing roller, the first printing roller having a larger diameter than the second printing roller. An ink conveyor belt is wound around the outer periphery of the first and second printing rollers. The ink conveyor belt has an inner rubber layer and an outer stainless steel layer. The stainless steel outer layer has ink storage grooves for transferring ink. The first printing roller contacts the ink-dipping roller via the ink conveyor belt. This gravure printing apparatus has the advantage of allowing the ink to adhere firmly to the paper, thus improving product quality. This invention also provides a gravure printing method.

Description

Technical Field

[0001] This invention relates to the field of printing apparatus technology, and also to printing methods, specifically to gravure printing apparatus and gravure printing methods. Background Technology

[0002] A gravure printing apparatus includes a frame on which are an ink tank, an ink-dipping roller, an ink transfer assembly, and a liner roller. The area between the ink transfer assembly and the liner roller is a printing station. Printing paper passes through the printing station to complete the printing process. The printing paper forms a printing paper path on the gravure printing apparatus. The printing paper path includes a rear printing paper path when the printing paper enters the printing station and a front printing paper path when the printing paper exits the printing station. The ink transfer assembly has an ink storage groove that receives the ink transferred from the ink-dipping roller and transfers the ink onto the paper to form the printing process.

[0003] In the prior art, the ink transfer component is a roller, namely a printing roller, which has ink storage grooves, such as patterns. In this case, the curvature of the part of the printing roller that contacts the ink-dipping roller is the same as the curvature of the part of the printing roller that contacts the printing station. Such a printing roller is not conducive to transferring ink to the paper, resulting in the ink not adhering firmly to the paper, which affects the printing quality. Summary of the Invention

[0004] The purpose of this invention is to address the above-mentioned shortcomings by providing a gravure printing apparatus and method that enables ink to adhere firmly to paper and improves product quality.

[0005] The technical solution of the gravure printing apparatus of the present invention is implemented as follows: A gravure printing apparatus includes a frame, on which there is an ink tank, an ink-dipping roller, an ink transfer assembly, and a liner roller. The area between the ink transfer assembly and the liner roller is the printing station. Printing paper can be printed by passing through the printing station. The area through which the printing paper passes on the gravure printing apparatus forms a printing paper path. The printing paper path includes a rear printing paper path when the printing paper enters the printing station and a front printing paper path when the printing paper exits the printing station. The characteristic is that the ink transfer assembly includes a first printing roller and a second printing roller. The diameter of the first printing roller is larger than the diameter of the second printing roller. An ink conveyor belt is wound around the outer periphery of the first and second printing rollers. The ink conveyor belt has an inner rubber layer and an outer stainless steel outer layer. This rubber layer is the conveyor belt rubber layer. The stainless steel outer layer has an ink storage groove for transferring ink. The first printing roller contacts the ink-dipping roller through the ink conveyor belt. The position between the second printing roller and the liner roller through the ink conveyor belt is the printing station.

[0006] In one embodiment, the diameter of the first printing roller is 2-4 times the diameter of the second printing roller.

[0007] Furthermore, the device frame has a sliding groove, the second printing roller has a second printing roller shaft core, the second printing roller shaft core is installed in the sliding groove via a slider, and a high-frequency vibration device is also installed on the device frame. The high-frequency vibration device has a vibration output end, the vibration output end is connected to the second printing roller shaft core, and the vibration direction of the vibration output end is perpendicular to the printing station.

[0008] In one embodiment, the high-frequency vibration device emits a vibration frequency of 10-20 Hz and an amplitude of 0.5-1.0 mm.

[0009] Furthermore, the outer periphery of the liner roller also has a rubber layer, which is the liner roller rubber layer.

[0010] Furthermore, a negative pressure device is installed on the device frame. The negative pressure device has an air extraction pipe connected to an air extraction plate. The air extraction plate has a plate surface, which is hollow and connected to the air extraction pipe. The plate surface has multiple air extraction holes facing the front printing paper path and on the opposite side of the inking assembly on the printing paper path.

[0011] Furthermore, a humidified chamber is installed on the device frame. The humidified chamber has a humidified chamber inlet and a humidified chamber outlet. The front-end printing paper route also passes through the humidified chamber inlet and the humidified chamber outlet to reach the printing station.

[0012] The technical solution of the gravure printing method of the present invention is implemented as follows: The gravure printing method uses a printing device to print on paper. The printing device has an ink transfer component, which includes an ink conveyor belt. The ink conveyor belt sequentially acquires ink and prints ink onto the paper. The curvature of the ink conveyor belt at the ink-printing part is greater than the curvature of the ink conveyor belt at the ink-acquiring part.

[0013] Furthermore, when the ink conveyor belt prints onto the paper, the ink transfer assembly is facing the paper and vibrates at a high frequency.

[0014] Furthermore, the paper is moistened before printing, with the moisture level reaching 2-4%.

[0015] Furthermore, after printing, air is drawn off the back of the paper (the side with the ink) to make the ink adhere more firmly to the paper.

[0016] The beneficial effects of this invention are that such gravure printing apparatus and gravure printing method have the advantages of making the ink adhere firmly to the paper and improving product quality. Attached Figure Description

[0017] Figure 1 This is a side view of the gravure printing device of the present invention.

[0018] Figure 2 This is a schematic diagram of the gravure printing device of the present invention (the device frame is not shown).

[0019] Figure 3 yes Figure 2 Enlarged diagram of point A in the diagram.

[0020] The components include: 1. Frame; 11. Slide; 2. Ink tank; 3. Ink-dipping roller; 4. Ink transfer assembly; 41. First printing roller; 42. Second printing roller; 421. Second printing roller shaft; 43. Ink conveyor belt; 431. Conveyor belt rubber layer; 432. Stainless steel outer layer; 4321. Ink storage groove; 5. Liner roller; 51. Liner roller rubber layer; 6. Printing station; 7. Printing path; 71. Rear printing paper path; 72. Front printing paper path; 8. High-frequency vibration device; 9. Negative pressure device; 91. Air extraction pipe; 92. Air extraction plate; 93. Air extraction hole; 10. Humid chamber; 101. Humid chamber inlet; 102. Humid chamber outlet. Detailed Implementation

[0021] The technical solution of the present invention will be further described below with reference to the embodiments.

[0022] like Figure 1 , 2 As shown in Figure 3, a gravure printing apparatus includes a frame 1, on which are an ink tank 2, an ink-dipping roller 3, an ink transfer assembly 4, and a liner roller 5. The area between the ink transfer assembly and the liner roller is a printing station 6. Printing paper passes through the printing station to complete the printing process. The area through which the printing paper passes on the gravure printing apparatus forms a printing paper path 7. The printing paper path includes a rear printing paper path 71 where the printing paper enters the printing station and a front printing paper path 72 where the printing paper exits the printing station. The characteristic feature is that the ink transfer assembly includes a first printing roller 4. 1. A first printing roller 42 has a larger diameter than the second printing roller. An ink conveyor belt 43 is wound around the outer periphery of both the first and second printing rollers. The ink conveyor belt has an inner rubber layer and an outer stainless steel outer layer 432. This rubber layer is the conveyor belt rubber layer 431. The stainless steel outer layer has ink storage grooves 4321 for transferring ink. The first printing roller contacts the ink-dipping roller via the ink conveyor belt. The position of the second printing roller between the ink conveyor belt and the liner roller is the printing station.

[0023] The design principle is that, since the diameter of the first printing roller is larger than that of the second printing roller, when the ink conveyor belt transfers the ink on it to the paper, the ink storage groove can be fully expanded, resulting in a wider ink storage groove. This facilitates the ink to be expelled from the ink storage groove and transferred to the paper, thereby achieving the purpose of improving product quality.

[0024] The device frame is equipped with a printing motor, which drives the ink-dipping roller, the ink transfer assembly, and the liner roller.

[0025] In one embodiment, the diameter of the first printing roller is 2-4 times the diameter of the second printing roller.

[0026] This allows for a better transfer of ink onto the paper.

[0027] Furthermore, the device frame has a sliding groove 11, the second printing roller has a second printing roller shaft core 421, the second printing roller shaft core is installed in the sliding groove via a slider, and a high-frequency vibration device 8 is also installed on the device frame. The high-frequency vibration device has a vibration output end, the vibration output end is connected to the second printing roller shaft core, and the vibration direction of the vibration output end is perpendicular to the printing station.

[0028] This invention is designed to allow ink in the ink reservoir to be transferred more effectively onto the paper.

[0029] In one embodiment, the high-frequency vibration device emits a vibration frequency of 10-20 Hz and an amplitude of 0.5-1.0 mm.

[0030] This allows for a better transfer of ink onto the paper.

[0031] Furthermore, the outer periphery of the liner roller also has a rubber layer, which is the liner roller rubber layer 51.

[0032] Furthermore, a negative pressure device 9 is installed on the device frame. The negative pressure device is an extraction device. The negative pressure device has an air extraction pipe 91, which is connected to an air extraction plate 92. The air extraction plate has a plate surface, which is hollow inside and connected to the air extraction pipe. The plate surface has multiple air extraction holes 93, which face the front printing paper path and are on the opposite side of the ink transfer assembly on the printing paper path.

[0033] This allows the ink to adhere more firmly to the paper.

[0034] Furthermore, a humid chamber 10 is installed on the device frame. The humid chamber has a humid chamber inlet 101 and a humid chamber outlet 102. The front-end printing paper route also passes through the humid chamber inlet and the humid chamber outlet to reach the printing station.

[0035] This allows the ink to adhere more firmly to the paper.

[0036] The technical solution of the gravure printing method of the present invention is implemented as follows: The gravure printing method uses a printing device to print on paper. The printing device has an ink transfer component, which includes an ink conveyor belt. The ink conveyor belt sequentially acquires ink and prints ink onto the paper. The curvature of the ink conveyor belt at the ink-printing part is greater than the curvature of the ink conveyor belt at the ink-acquiring part.

[0037] Furthermore, when the ink conveyor belt prints onto the paper, the ink transfer assembly is facing the paper and vibrates at a high frequency.

[0038] Furthermore, the paper is moistened before printing, with the moisture level reaching 2-4%.

[0039] Furthermore, after printing, air is drawn off the back of the paper (the side with the ink) to make the ink adhere more firmly to the paper.

[0040] It should be noted that the embodiments and beneficial effects of the above-described gravure printing apparatus and method are mutually understandable, explanatory and complementary.

[0041] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A gravure printing apparatus, comprising a frame, an ink tank, an ink-dipping roller, an ink transfer assembly, and a liner roller on the frame, wherein the area between the ink transfer assembly and the liner roller is a printing station, and printing paper is printed by passing through the printing station. The portion of the printing paper passing through the gravure printing apparatus forms a printing paper path, wherein the printing paper path includes a rear printing paper path when the printing paper enters the printing station and a front printing paper path when the printing paper exits the printing station; characterized in that: The ink transfer assembly includes a first printing roller and a second printing roller. The diameter of the first printing roller is larger than that of the second printing roller. An ink conveyor belt is wound around the outer periphery of the first and second printing rollers. The ink conveyor belt has an inner rubber layer and an outer stainless steel outer layer. The rubber layer is the conveyor belt rubber layer, and the stainless steel outer layer has ink storage grooves for transferring ink. The first printing roller contacts the ink-dipping roller through the ink conveyor belt, and the position of the second printing roller between the ink conveyor belt and the liner roller is the printing station. The diameter of the first printing roller is 2-4 times the diameter of the second printing roller.

2. The gravure printing apparatus according to claim 1, characterized in that: The device frame has a sliding groove, the second printing roller has a second printing roller shaft core, the second printing roller shaft core is installed in the sliding groove via a slider, and a high-frequency vibration device is also installed on the device frame. The high-frequency vibration device has a vibration output end, the vibration output end is connected to the second printing roller shaft core, and the vibration direction of the vibration output end is perpendicular to the printing station.

3. The gravure printing apparatus according to claim 2, characterized in that: Another negative pressure device is installed on the device frame. The negative pressure device has an air extraction pipe connected to an air extraction plate. The air extraction plate has a plate surface, which is hollow inside and connected to the air extraction pipe. The plate surface has multiple air extraction holes facing the front printing paper path and on the opposite side of the ink transfer assembly on the printing paper path.

4. The gravure printing apparatus according to claim 3, characterized in that: Another humidified chamber is installed on the device frame. The humidified chamber has a humidified chamber inlet and a humidified chamber outlet. The front-end printing paper route also passes through the humidified chamber inlet and the humidified chamber outlet to reach the printing station.

5. A gravure printing method, wherein a printing apparatus is used to print on paper, the printing apparatus having an ink transfer component, the ink transfer component including an ink conveyor belt, the ink conveyor belt sequentially acquiring ink and printing ink onto the paper, the curvature of the ink conveyor belt at the ink-printing section on the paper being greater than the curvature of the ink conveyor belt at the ink-acquiring section.

6. The gravure printing method according to claim 5, characterized in that: When the ink conveyor belt prints onto the paper, the ink transfer assembly is facing the paper and vibrates at a high frequency.

7. The gravure printing method according to claim 6, characterized in that: The paper is also moistened before printing, to a moisture level of 2-4%.

8. The gravure printing method according to claim 7, characterized in that: After printing, air is sucked from the back of the paper to make the ink adhere more firmly to the paper.

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