An embossing roller temperature control device

Abstract

The application relates to a temperature control device for a embossing roller, and relates to the technical field of aluminum foil embossing processing equipment. The device comprises an embossing roller, an electromagnetic heating system, a moving mechanism and a temperature control system. The electromagnetic heating system is arranged above the embossing roller through the moving mechanism and can be driven to move along the axial direction and the radial direction of the embossing roller. The temperature control system is connected with the electromagnetic heating system and can perform closed-loop control according to the feedback signal of a temperature sensor, so as to cooperatively control the moving mechanism and the heating power. Preferably, an axial heat insulation structure is arranged in the embossing roller, and a cooling system is arranged on one side. The application combines movable local heating, closed-loop control and physical heat insulation, effectively overcomes the technical problem that the temperature difference is difficult to maintain due to the heat conduction of the embossing roller itself, can form and maintain a stable and programmable dynamic temperature field on the roller surface, and thus meets the process requirement of realizing colorful embossing of aluminum foil by using temperature-variable paint.

Description

Technical Field

[0001] This application relates to the technical field of aluminum foil embossing equipment, and in particular to an embossing roller temperature control device. Background Technology

[0002] In the high-end packaging and anti-counterfeiting printing industry, a special process is often used to enhance the visual appeal and added value of products: coating the surface of aluminum foil with a thermochromic coating, and then embossing it using an embossing roller with a specific texture. Thermochromic coatings possess unique thermochromic properties, and their color changes depending on the contact temperature during embossing. Therefore, by precisely controlling the temperature of different areas on the surface of the embossing roller, a rich variety of patterns can be achieved on the aluminum foil in a single embossing process, resulting in a unique visual expression.

[0003] Currently, heating embossing rollers mainly relies on traditional methods. One is internal heating, such as installing electric heating tubes inside the roller body or circulating heat transfer oil to heat the entire roller body. The other is external heating, such as fixing infrared heating tubes or hot air guns near the roller body to irradiate and heat the roller surface. However, these traditional methods have significant limitations: First, they mainly aim to achieve uniform heating of the entire roller body or a large area, and cannot perform rapid and precise local temperature control for specific locations on the roller surface, thus making it difficult to form the dynamic temperature distribution that varies with position required for complex patterns.

[0004] Therefore, the existing technology lacks a device that can effectively control the temperature of the embossing roller surface locally, precisely, adjustable and stably, which has become a key technical bottleneck hindering the development and promotion of high-quality multicolor aluminum foil embossing technology. Utility Model Content

[0005] In order to achieve precise control of the local temperature of the roller surface during the embossing process, so as to make the thermochromic coating on the aluminum foil paper present a stable and colorful pattern, this application provides an embossing roller temperature control device.

[0006] This application provides a temperature control device for an embossing roller, which adopts the following technical solution: An embossing roller temperature control device includes an embossing roller, an electromagnetic heating system, a moving mechanism, and a temperature control system. The electromagnetic heating system is disposed above the embossing roller via the moving mechanism. The moving mechanism is used to drive the electromagnetic heating system to move along the axial direction of the embossing roller and to move in a direction toward or away from the surface of the embossing roller. The temperature control system is electrically connected to the electromagnetic heating system and is used to control its heating operation.

[0007] By adopting the above technical solution, the moving mechanism drives the electromagnetic heating system to move, performing non-contact, positionable local induction heating on the surface of the embossing roller, and the temperature control system coordinates the heating operation in a unified manner, realizing precise local and adjustable heating of the embossing roller, providing a foundation for subsequent differential temperature control of the roller surface, and breaking through the limitations of traditional overall heating or fixed-point heating.

[0008] Furthermore, the moving mechanism is mounted above the embossing roller via a frame, and the moving mechanism includes: A horizontal sliding block is slidably mounted on the frame along the axis of the embossing roller; A horizontal drive unit, which is mounted on the frame and used to drive the horizontal sliding block to slide; A vertical sliding block is slidably disposed on a horizontal sliding block in a direction toward or away from the surface of the embossing roller, and the electromagnetic heating coil of the electromagnetic heating system is disposed on the vertical sliding block; A vertical drive unit is disposed on a horizontal sliding block and is used to drive the vertical sliding block to slide.

[0009] By adopting the above technical solution, a precision two-dimensional moving mechanism consisting of a horizontal sliding block, a vertical sliding block, and a driving component is used to achieve precise and independent control of the axial and radial positions of the electromagnetic heating coil. This allows the heating point to be positioned freely, accurately, and quickly in a two-dimensional plane, and the heating distance can be flexibly adjusted, greatly improving the device's flexibility and control accuracy in adapting to different heating needs.

[0010] Furthermore, it also includes a temperature sensor for detecting the surface temperature of the embossing roller. The temperature sensor is signal-connected to the temperature control system, enabling the temperature control system to perform closed-loop control of the electromagnetic heating system based on the feedback signal from the temperature sensor.

[0011] By adopting the above technical solution, a temperature sensor is introduced to monitor the roller surface temperature in real time and feed the signal back to the temperature control system. The system adjusts the heating power in real time according to the deviation between the measured temperature and the target temperature, realizing closed-loop automatic temperature control. This effectively compensates for temperature fluctuations caused by environmental changes, heat conduction and other factors, and significantly improves the stability and accuracy of temperature control.

[0012] Furthermore, the temperature control system connects to and controls the horizontal drive component, the vertical drive component, and the electromagnetic heating system, so that the electromagnetic heating coil can move and heat according to a preset heating position sequence, and the temperature control system adjusts the output power of the electromagnetic heating system according to the feedback signal from the temperature sensor.

[0013] By adopting the above technical solution, the temperature control system, based on a preset temperature distribution program, not only controls the heating power but also coordinates the movement of the moving mechanism, so that the electromagnetic heating coil heats different areas of the roller surface sequentially or following the path planned in the program, forming a dynamically changing temperature field. This achieves dynamic maintenance of the temperature field on the surface of the embossing roller, and can actively and stably create the temperature difference distribution required for complex patterns. It is the core control logic for realizing the automated production of multicolor embossing.

[0014] Furthermore, the embossing roller is a composite roller body, and axial heat insulation structures are embedded at intervals along the axial direction inside the embossing roller. A metal heat-conducting layer is present between the axial heat insulation structure and the working surface of the embossing roller.

[0015] By adopting the above technical solution, an axial heat insulation structure is deeply embedded inside the embossing roller, which physically increases the thermal resistance of heat conduction along the roller body axis. At the same time, the surface metal heat-conducting layer is retained to ensure surface integrity. This significantly inhibits axial heat conduction from a physical structure perspective, making the heat exchange between adjacent high-temperature and low-temperature zones slow down. This greatly enhances the stability of local temperature differences and reduces the control energy consumption and difficulty required to maintain the temperature difference.

[0016] Furthermore, it also includes a cooling system disposed on one side of the embossing roller, the cooling system being used to selectively cool the surface of the embossing roller.

[0017] By adopting the above technical solution, a cooling system is set on one side of the embossing roller, which can selectively force-cool specific areas of the roller surface, providing an active cooling method that can quickly reduce the temperature of the designated area; in conjunction with the heating system, it can achieve greater temperature difference control, faster temperature switching speed, and help correct temperature rise caused by accidental heat diffusion.

[0018] Furthermore, the cooling system is an air-cooled system or a water-cooled system, and is located on the other side of the embossing roller opposite to the electromagnetic heating system.

[0019] By adopting the above technical solution, using air cooling or water cooling, and arranging it on the other side of the roller surface opposite to the heating system, the surface of the embossing roller can pass through the heating zone, hot pressing zone and cooling zone in sequence during rotation. This separates the cooling and heating spaces, preventing them from interfering with each other, and achieves zoned and coordinated control of the roller surface temperature, thereby enhancing the overall temperature control capability.

[0020] Furthermore, the outer cover of the electromagnetic heating coil is provided with a retractable heat insulation cover. One end of the heat insulation cover is connected to a horizontal sliding block, and the other end of the heat insulation cover is set on a vertical sliding block. There is a gap between the bottom of the heat insulation cover and the surface of the embossing roller. The heat insulation cover is used to constrain the thermal field of the heating area.

[0021] By adopting the above technical solution, a retractable heat insulation cover that can move with the electromagnetic heating coil is set outside the coil, forming a relatively closed space between the coil and the roller surface. This reduces air flow, effectively constrains the thermal field of the heating area, reduces heat loss and environmental interference caused by air convection, and allows electromagnetic energy to act more concentratedly on the target area, thereby improving heating efficiency, reducing energy consumption, and enhancing the accuracy and stability of local temperature control.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. By setting up an electromagnetic heating system that can move along the axial and radial directions of the embossing roller, local, precise and adjustable heating of any position on the surface of the embossing roller is achieved, which provides a basis for creating differentiated temperature distribution on a single roller body and breaks through the limitations of traditional fixed or overall heating.

[0023] 2. By introducing a temperature sensor and a temperature control system to form a closed-loop control, and combining it with the axial heat insulation structure set inside the embossing roller, the temperature drift caused by the heat conduction of the roller itself can be effectively suppressed and compensated, thereby stably establishing and maintaining the required local temperature difference on the surface of the high-speed rotating embossing roller.

[0024] 3. By setting a cooling system on the other side of the embossing roller opposite to the electromagnetic heating system, spatial partitioning and functional synergy of heating and cooling are achieved, which can quickly adjust the temperature of specific areas, form a more significant temperature difference, and enhance the overall temperature field control capability and response speed.

[0025] 4. By enabling the temperature control system to coordinate the control of the moving mechanism, electromagnetic heating system and cooling system according to the preset temperature distribution program, the automated programming control of the dynamic temperature field is realized, which meets the needs of continuous, efficient and stable production of complex and colorful embossed patterns. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the embossing roller temperature control device according to Embodiment 1 of this application; Figure 2 This is a top view of the present application, in which the temperature sensor is not shown; Figure 3 yes Figure 2 A cross-sectional schematic diagram of AA in the middle; Figure 4 yes Figure 3 Cross-sectional schematic diagram of BB; Figure 5 This is a schematic diagram of the heat shield structure of Embodiment 2 of this application.

[0027] Reference numerals: 1. Embossing roller; 11. Axial heat insulation structure; 2. Frame; 3. Electromagnetic heating system; 4. Moving mechanism; 41. Horizontal sliding block; 411. Horizontal guide rail; 42. Vertical sliding block; 43. Horizontal drive component; 44. Vertical drive component; 5. Temperature sensor; 6. Cooling system; 61. Cold air nozzle; 7. Heat insulation cover. Detailed Implementation

[0028] The following is in conjunction with the appendix Figures 1-5 This application will be described in further detail.

[0029] This application discloses a temperature control device for embossing rollers.

[0030] Example 1 Reference Figure 1 A temperature control device for an embossing roller 1 is disclosed. The device includes an embossing roller 1, a frame 2, an electromagnetic heating system 3, a moving mechanism 4, a temperature control system, a temperature sensor 5, and a cooling system 6. It mainly heats different positions on the surface of the embossing roller 1 to different temperatures, thereby performing multi-color embossing on aluminum foil paper coated with thermochromic paint.

[0031] Reference Figure 1 The embossing roller 1 is rotatably mounted on the frame via bearing seats at both ends and is driven to rotate by an external drive motor. The aluminum foil to be processed passes between the embossing roller 1 and the matching pressure roller.

[0032] Reference Figure 1 The frame 2 spans above the embossing roller 1, providing support for the entire moving mechanism 4 and heating mechanism. The moving mechanism 4 is mounted on the frame 2 and is used to carry and drive the electromagnetic heating system 3 to move.

[0033] Reference Figure 2 Specifically, the moving mechanism 4 includes a horizontal sliding block 41, a horizontal driving component 43, a vertical sliding block 42, and a vertical driving component 44. A horizontal guide rail 411 extending along the axis of the embossing roller 1 is provided on the frame 2. The horizontal sliding block 41 slides axially through a slider engaging with the horizontal guide rail 411. The horizontal driving component 43 is fixedly mounted on the frame 2, and its output end (such as a lead screw or rack and pinion) is connected to the horizontal sliding block 41. In this embodiment, the horizontal driving component 43 is preferably a servo motor, which can precisely control the moving position and speed of the horizontal sliding block 41.

[0034] Reference Figure 2The vertical sliding block 42 is slidably mounted on the horizontal sliding block 41 along a linear guide rail, moving towards or away from the surface of the embossing roller. The electromagnetic heating system 3 includes an electromagnetic heating coil and a high-frequency power supply and power controller that power it. The power controller is communicatively connected to the central temperature control system and receives its commands to adjust the heating power. The electromagnetic heating coil is fixedly mounted on the vertical sliding block 42. The vertical drive component 44 (such as a servo electric cylinder or a stepper motor with a lead screw) is fixedly mounted on the horizontal sliding block 41, and its output end is connected to the vertical sliding block 42 to drive the vertical sliding block 42, together with the electromagnetic heating coil, to move towards or away from the surface of the embossing roller 1. Through the coordinated operation of the moving mechanism 4, the electromagnetic heating coil can be precisely positioned at any position above the embossing roller 1, and the heating distance can be adjusted.

[0035] Reference Figure 3 The temperature sensor 5 is preferably a non-contact infrared thermometer, which is fixedly installed by a bracket, with its probe pointing towards the surface of the embossing roller 1, for real-time monitoring of the roller surface temperature. The temperature control system (such as a programmable logic controller (PLC)) is electrically connected to the temperature sensor 5, the power controller of the electromagnetic heating system 3, the horizontal drive component 43, and the vertical drive component 44, respectively. In this embodiment, multiple sets of temperature sensors 5 are arranged at intervals along the axial direction of the embossing roller 1 to monitor the temperature at different positions along the length of the embossing roller 1.

[0036] Reference Figure 3 The working logic of the temperature control system is as follows: It has a pre-stored temperature distribution program corresponding to the target aluminum foil pattern. During operation, the temperature control system first controls the horizontal drive component 43 and the vertical drive component 44 according to the program instructions, moving the electromagnetic heating coil above the first target heating area on the surface of the embossing roller 1. Then, it starts the electromagnetic heating system 3 and dynamically adjusts the output power of the electromagnetic heating coil based on the real-time temperature of the area fed back by the temperature sensor 5, using PID and other control algorithms, so that the area quickly reaches and stabilizes at the preset first temperature T1. After heating this area, the system controls the electromagnetic heating coil to quickly move to the next target area and repeats the above process to reach the preset second temperature T2. Since the embossing roller 1 is continuously rotating and the aluminum foil is continuously fed, this process is essentially a dynamic scanning heating. Through the coordination of the moving mechanism 4 and power control, and compensation based on real-time temperature feedback, the temperature control system forms a stable dynamic temperature field on the surface of the embossing roller 1 that matches the pattern, effectively counteracting the temperature equalization trend caused by the roller's own heat conduction.

[0037] Reference Figure 4To further suppress axial heat conduction of the embossing roller 1 and enhance the independence of adjacent temperature zones, the embossing roller 1 is preferably a composite roller body. Multiple blind holes are machined at intervals along the axial direction inside the roller body. A sufficiently thick metal thermally conductive layer is maintained between the bottom of these blind holes and the working surface of the embossing roller 1, thereby ensuring the integrity and continuity of the working surface. An axial heat insulation structure 11 made of high-strength, low-thermal-conductivity, high-temperature resistant ceramic material is embedded within these blind holes. This structure significantly increases the thermal resistance of axial heat conduction inside the roller body, slowing down heat exchange between the high-temperature and low-temperature zones, providing a more favorable physical basis for the aforementioned dynamic temperature control, and reducing control energy consumption and difficulty.

[0038] Reference Figure 1 The cooling system 6 is located on one side of the embossing roller 1, specifically on the other side of the embossing roller 1 opposite to the electromagnetic heating system 3. The cooling system 6 is preferably an air-cooled system, comprising multiple independently controllable cold air nozzles 61, which are connected to a cooler via pipes. In other embodiments, the cooling system 6 may also employ other equivalent cooling methods such as a water-cooled system (e.g., via atomizing nozzles or a coolant circulation sleeve).

[0039] Reference Figure 1 The cooling system 6 is used to selectively cool the surface of the embossing roller 1. For example, when it is necessary to quickly reduce the temperature of a certain area or to form a more obvious cold isolation zone between two heating zones, the temperature control system can instruct the corresponding cooling unit (such as a specific nozzle) to open and provide auxiliary cooling to that specific area. This, in conjunction with the electromagnetic heating system 3, enables greater temperature difference control and faster temperature response.

[0040] The working principle of Embodiment 1 of this application is as follows: According to the preset pattern temperature program, the temperature control system drives the electromagnetic heating coil to move to a designated position on the surface of the embossing roller 1 for heating, and adjusts the power in real time based on the feedback from the temperature sensor 5 to form a dynamic temperature field. At the same time, the axial heat insulation structure 11 inside the embossing roller 1 and the external selective cooling system 6 work together to suppress heat conduction, thereby actively establishing and maintaining a stable, programmable dynamic temperature field on the surface of the embossing roller 1. This allows the thermochromic coating on the aluminum foil to accurately respond to the temperature of different areas during embossing, presenting the expected colorful pattern, effectively overcoming the technical obstacle of traditional uniform heating methods that cannot achieve local temperature difference control.

[0041] Example 2 Reference Figure 5The difference between this embodiment and Embodiment 1 is that a retractable heat insulation cover 7 can be installed outside the electromagnetic heating coil. The upper end of the heat insulation cover 7 is fixedly connected to the horizontal sliding block 41, and its lower end is connected to the vertical sliding block 42 through an elastic sealing element (such as a high-temperature resistant corrugated pipe or ceramic fiber cloth). When the vertical sliding block 42 drives the electromagnetic heating coil to descend, the heat insulation cover 7 is compressed; when the coil rises, the heat insulation cover 7 expands due to elastic recovery. The bottom of the heat insulation cover 7 always maintains a safe, small gap with the surface of the embossing roller 1. The function of the heat insulation cover 7 is not to conduct heat, but to constrain the thermal field: it can form a relatively closed space between the electromagnetic heating coil and the surface of the embossing roller 1, effectively reducing heat loss caused by air flow, making the electromagnetic energy more concentrated on the target heating point, improving heating efficiency and the accuracy of local temperature control.

[0042] The working principle of Embodiment 2 of this application is as follows: When the electromagnetic heating coil moves to the working position and begins heating, the heat shield 7 moves accordingly, creating a relatively sealed cavity between the coil and the surface of the embossing roller 1. This structure significantly suppresses heat loss due to air convection and also reduces interference from ambient airflow on the heating process. As a result, the magnetic field energy generated by the electromagnetic coil can act more efficiently and concentratedly on the target heating area of ​​the embossing roller 1, reducing ineffective dissipation into the surrounding space, thereby further improving the accuracy and stability of local temperature control.

[0043] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A temperature control device for an embossing roller (1), comprising an embossing roller (1), characterized in that, It also includes an electromagnetic heating system (3), a moving mechanism (4) and a temperature control system. The electromagnetic heating system (3) is disposed above the embossing roller (1) via the moving mechanism (4). The moving mechanism (4) is used to drive the electromagnetic heating system (3) to move along the axial direction of the embossing roller (1) and to move in a direction toward or away from the surface of the embossing roller (1). The temperature control system is electrically connected to the electromagnetic heating system (3) and is used to control its heating operation.

2. The temperature control device for an embossing roller (1) according to claim 1, characterized in that: The moving mechanism (4) is mounted above the embossing roller (1) via the frame (2), and the moving mechanism (4) includes: A horizontal sliding block (41) is mounted on the frame (2) and slides along the axis of the embossing roller (1). A horizontal drive (43) is mounted on the frame (2) and is used to drive the horizontal sliding block (41) to slide. A vertical sliding block (42) is slidably disposed on a horizontal sliding block (41) in a direction toward or away from the surface of the embossing roller (1), and the electromagnetic heating coil of the electromagnetic heating system (3) is disposed on the vertical sliding block (42). A vertical drive (44) is disposed on a horizontal sliding block (41) and is used to drive the vertical sliding block (42) to slide.

3. The temperature control device for an embossing roller (1) according to claim 2, characterized in that: It also includes a temperature sensor (5) for detecting the surface temperature of the embossing roller (1), the temperature sensor (5) being signal-connected to the temperature control system, so that the temperature control system can perform closed-loop control of the electromagnetic heating system (3) based on the feedback signal of the temperature sensor (5).

4. The temperature control device for an embossing roller (1) according to claim 3, characterized in that: The temperature control system connects to and controls the horizontal drive (43), the vertical drive (44) and the electromagnetic heating system (3) so that the electromagnetic heating coil can move and heat according to the preset heating position sequence, and the temperature control system adjusts the output power of the electromagnetic heating system (3) according to the feedback signal of the temperature sensor (5).

5. The temperature control device for an embossing roller (1) according to claim 1, characterized in that: The embossing roller (1) is a composite roller body. An axial heat insulation structure (11) is embedded inside the embossing roller (1) at intervals along the axial direction. A metal heat-conducting layer is present between the axial heat insulation structure (11) and the working surface of the embossing roller (1).

6. The temperature control device for an embossing roller (1) according to claim 1, characterized in that: It also includes a cooling system (6) disposed on one side of the embossing roller (1), the cooling system (6) being used to selectively cool the surface of the embossing roller (1).

7. The temperature control device for an embossing roller (1) according to claim 6, characterized in that: The cooling system (6) is an air-cooled system or a water-cooled system, and is located on the other side of the embossing roller (1) opposite to the electromagnetic heating system (3).

8. The temperature control device for an embossing roller (1) according to claim 2, characterized in that: The outer cover of the electromagnetic heating coil is provided with a retractable heat insulation cover (7). One end of the heat insulation cover (7) is connected to a horizontal sliding block (41), and the other end of the heat insulation cover (7) is set on a vertical sliding block (42). There is a gap between the bottom of the heat insulation cover (7) and the surface of the embossing roller (1). The heat insulation cover (7) is used to constrain the thermal field of the heating area.

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