Multicolor photogravure press
By adding a tension sensor roller and adjusting the function of the printing roller motor in a multicolor gravure printing press, the problems of registration accuracy and waste caused by color group imbalance in the printing press were solved, achieving higher registration accuracy and a shorter film path.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SINOMECH CORP
- Filing Date
- 2025-06-12
- Publication Date
- 2026-05-19
AI Technical Summary
When the number of colors in the product to be printed is less than the total number of color groups in the printing press, some color groups will be idle, resulting in unstable tension, difficulty in controlling the registration accuracy, and increased waste length.
Tension sensor rollers are added between printing color groups, and the plate roller motor control is set to have two functions: registration and traction. The traction station is adjusted according to the change in the number of printed colors to block the film tension between idle color groups and printed color groups, thus optimizing the film path.
It improved the registration accuracy, reduced the waste material length, stabilized the tension between printing ink groups, and optimized the film path.
Smart Images
Figure CN224256265U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of printing press technology, and in particular to a multicolor gravure printing press. Background Technology
[0002] In existing multicolor gravure printing presses, users select the actual number of printing press color groups to participate in printing based on the number of colors of the product to be printed, with the number of product colors to be printed being the same as the number of selected printing press color groups. Because the actual number of product colors to be printed is often less than the total number of color groups on the printing press, the press frequently experiences a situation where some color groups are operating while others are idle. Whether it's reverse or surface printing, the film fills all the printing press units, resulting in a longer film path and increased waste material. For substrates with high tensile strength, the tension between printing press units is also affected by the tension of the idle color groups, making it difficult to control registration accuracy and increasing the difficulty of machine setup. Summary of the Invention
[0003] The technical problem to be solved by this utility model is to provide a multi-color gravure printing machine that improves registration accuracy and reduces waste length.
[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is: a multi-color gravure printing machine, which includes an unwinding unit, several printing color groups, and a rewinding unit in sequence according to the film material conveying direction. The printing color group includes a drying box, a functional roller located at the bottom of the drying box, a tension sensor roller located at the top of the drying box, and a guide roller group. The film material passes through the guide roller group and the functional roller and tension sensor roller in sequence. The functional roller is a plate roller or a traction roller. The principle of this utility model is: it is necessary to add tension sensor rollers between printing color groups, and set the motor control of each plate roller to have two functions: registration and traction. The function can be switched as required. The traction station is set at the plate roller station before the reverse printing or the plate roller station after the surface printing. The position of this station varies with the number of printing colors. Its purpose is: (1) to block the tension of the film material between the idle color group and the printing color group, stabilize the tension between the printing color groups, and improve the registration accuracy; (2) to change the film material path, shorten the material threading length, and reduce the waste length.
[0005] As an improvement, there are a total of n printing color groups, of which m are substrate color groups. The functional rollers in the substrate color groups are plate rollers. During surface printing, the functional rollers of the non-substrate color group m+1 are traction rollers. During reverse printing, the functional rollers of the non-substrate color group nm are traction rollers.
[0006] As an improvement, during surface printing, the film material in the unwinding unit passes sequentially through the low-position printing rollers of each printing color group, the traction roller of the first non-printing color group, and the high-position guide rollers of each non-printing color group.
[0007] As an improvement, during reverse printing, the film material in the unwinding unit passes sequentially through the high-position guide rollers of each non-printing color group, the traction roller of the last non-printing color group, and the low-position plate rollers of each printing color group.
[0008] The beneficial effects of this utility model compared with the prior art are:
[0009] Tension sensor rollers need to be added between printing color groups, and the motor control of each printing roller needs to be set to two functions: registration and traction. The function can be switched as required. The traction station is set at the printing roller station before the reverse printing or the printing roller station after the surface printing. The position of this station varies with the number of colors to be printed. Its purpose is to: (1) block the tension of the film material between the idle color group and the printing color group, stabilize the tension between the printing color groups, and improve the registration accuracy; (2) change the film material path, shorten the material threading length, and reduce the waste length. Attached Figure Description
[0010] Figure 1 This is a pattern diagram for the surface printing mode.
[0011] Figure 2 This is a diagram of the printing process in the reverse printing mode. Detailed Implementation
[0012] The present invention will be further described below with reference to the accompanying drawings.
[0013] like Figure 1 , 2 As shown, a multi-color gravure printing machine includes, in sequence according to the film material conveying direction, an unwinding unit 1, several printing color groups 2, an inspection unit 4, and a rewinding unit 5. Each printing color group includes a drying chamber, a functional roller located at the bottom of the drying chamber, a tension sensor roller 3 located at the top of the drying chamber, and a guide roller group. The film material passes through the guide roller group sequentially through the functional roller and the tension sensor roller. The functional roller is either a printing roller or a traction roller. In this embodiment, there are a total of n printing color groups, of which m are substrate color groups. Figure 1 As shown, the surface printing film feeding method is as follows: the functional roller in the printing color group is the plate roller, and the plate roller station of the non-printing color group m+1 is set as the positioning traction roller, forming a closed loop control with the tension sensor roller above the last printing color group. The printing film forms a stable tension system between the printing color groups, thereby improving the registration accuracy. When m=n-1 or m=n, a separate traction roller is no longer set up. From printing color group 1 to printing color group m+1, the film is fed according to the printing mode. From printing color group m+2 to printing color group n, the film is not fed according to the printing mode, but adopts a high-position cross-color group feeding method. The film feeding length of each color group is about 5 meters. The new film feeding path can shorten the feeding length by (nm-1)*5 meters. During surface printing, the film in the unwinding unit passes sequentially through the low-position plate roller of each printing color group, the traction roller of the first non-printing color group, and the high-position guide roller of each non-printing color group. Figure 2As shown, the reverse printing film feeding method is as follows: the functional rollers in the substrate color group are plate rollers, and the plate rollers of the non-substrate color group nm are set as traction rollers, forming a closed-loop control with the tension sensor roller above them. The printing film forms a stable tension system between the substrate color groups, thereby improving the registration accuracy. When m=n-1 or m=n, a separate traction roller is no longer set up. From the printing color group nm to the printing color group n, the film is fed according to the printing mode. From the printing color group 1 to the printing color group nm-1, the printing film is not fed according to the printing mode, but adopts a high-position cross-color group feeding method. The feeding length of each color group is about 5 meters. The new film feeding path can shorten the feeding length by (nm-1)*5 meters. During reverse printing, the film in the unwinding unit passes sequentially through the high-position guide rollers of each non-substrate color group, the traction roller of the last non-substrate color group, and the low-position plate rollers of each substrate color group. Installation of traction roller: When the printing station is converted into a traction station, the printing roller of the station is removed and replaced with a traction steel roller. The control mode of the station is then changed from printing mode to traction mode.
Claims
1. A multi-color gravure printing machine, comprising, in sequence according to the film conveying direction, an unwinding unit, a plurality of printing color groups, and a rewinding unit, characterized in that: The printing color group includes a drying chamber, a functional roller located at the bottom of the drying chamber, a tension sensor roller located at the top of the drying chamber, and a guide roller group. The film material passes through the guide roller group in sequence through the functional roller and the tension sensor roller. The functional roller is a printing roller or a traction roller.
2. The multicolor gravure printing machine according to claim 1, characterized in that: There are a total of n printing color groups, of which m are substrate color groups. The functional rollers in the substrate color groups are plate rollers. During surface printing, the functional rollers of the non-substrate color group m+1 are traction rollers. During reverse printing, the functional rollers of the non-substrate color group nm are traction rollers.
3. A multicolor gravure printing machine according to claim 2, characterized in that: During surface printing, the film material in the unwinding unit passes sequentially through the low-position printing rollers of each printing color group, the traction roller of the first non-printing color group, and the high-position guide rollers of each non-printing color group.
4. A multicolor gravure printing machine according to claim 2, characterized in that: During reverse printing, the film material in the unwinding unit passes sequentially through the high-position guide rollers of each non-printing color group, the traction roller of the last non-printing color group, and the low-position plate rollers of each printing color group.