Coating device for release paper production

Abstract

The utility model relates to the technical field of release paper production, in particular to a coating device for release paper production, which comprises a support and a coating mechanism. The coating mechanism comprises an anilox roller which is rotatably arranged on the bracket, and the lower side of the anilox roller is intruded into the release agent groove; the metering roller is rotationally arranged on the support and arranged on the upper side of the anilox roller in parallel, and piezoelectric sensors are symmetrically arranged on the two sides of the metering roller; the back pressure roller is arranged on the bracket in a sliding manner through a micro displacement device and is arranged on the upper side of the metering roller in parallel; the first pressurizing mechanism is arranged on the bracket and is connected with the back pressure roller; and the pressure adjusting system is connected with the piezoelectric sensor, the micro-displacement device and the first pressurizing mechanism. The coating device for release paper production aims at compressing coating thickness fluctuation to be within + / -0.5% through a pressure-thickness fact mapping model, and the yield and the manufacturing precision are improved.

Description

Technical Field

[0001] This utility model relates to the field of release paper production technology, and more specifically, to a coating device for release paper production. Background Technology

[0002] The surface properties of paper, especially its smoothness and gloss, are core indicators that determine its printability and end-application performance. Smoothness reflects the flatness of the paper's surface microstructure and directly affects the uniformity of ink absorption; gloss characterizes the specular reflection ability of light and is closely related to the visual quality of printed materials.

[0003] In the field of release paper coating equipment, the uniformity of coating thickness directly determines the barrier performance and surface quality of the product. Traditional coating equipment typically uses an anilox roller-doctor combination to transfer the release agent, and its core technology lies in controlling the coating amount through mechanical gaps. However, existing technologies have significant shortcomings in terms of adaptability to multiple working conditions, dynamic precision control, and equipment stability, which restricts the industrial production of high-end release film products.

[0004] Existing back pressure roller pressure regulation largely relies on independent hydraulic stations, lacking data coupling with the metering roller system. In actual production, the pressure fluctuations of the back pressure roller and the changes in the metering roller gap have a superimposed effect, resulting in nonlinear deviations in coating thickness. Furthermore, traditional equipment requires manual calibration during downtime, severely limiting production line uptime. Utility Model Content

[0005] The main purpose of this invention is to propose a coating device for release paper production, which aims to reduce coating thickness fluctuation to within ±0.5% by using a pressure-thickness fact mapping model, thereby improving yield and manufacturing accuracy.

[0006] To address the aforementioned technical problems, a coating apparatus for release paper production is proposed, comprising: a support and a coating mechanism;

[0007] The coating mechanism includes:

[0008] An anilox roller is rotatably mounted on the bracket, with its lower side immersing in the release agent tank;

[0009] A metering roller is rotatably mounted on the support and is arranged parallel to the upper side of the anilox roller. Piezoelectric sensors are symmetrically arranged on both sides of the metering roller. The piezoelectric sensors are used to measure the pressure between the metering roller and the release paper.

[0010] The back pressure roller is slidably mounted on the bracket via a micro-displacement device and is arranged parallel to the upper side of the metering roller.

[0011] The first pressurizing mechanism is mounted on the bracket and connected to the back pressure roller, and is used to adjust the pressure between the back pressure roller and the metering roller.

[0012] A pressure regulating system is connected to the piezoelectric sensor, the micro-displacement device, and the first pressure boosting mechanism, respectively. The pressure regulating system is used to infer the thickness of the release paper based on the pressure of the piezoelectric sensor and to adjust the power of the first pressure boosting mechanism and the micro-displacement device according to the measured thickness.

[0013] In any of the above technical solutions, further comprising:

[0014] A dust removal mechanism is installed on the support, and compared to the coating mechanism, the dust removal mechanism is located on the side away from the release paper output end;

[0015] The curing mechanism is located on the support, and compared with the coating mechanism, the curing mechanism is located on the side closer to the release paper output end;

[0016] The calendering mechanism is located on the support, and compared to the curing mechanism, the calendering mechanism is located on the side closer to the release paper output end.

[0017] In any of the above technical solutions, the dust removal mechanism further includes:

[0018] A dust collection box is installed on the support, and the release paper conveying route passes through the dust collection box;

[0019] Two dust removal rollers are symmetrically arranged inside the dust removal box, and their surfaces are inlaid with carbon fiber bristles.

[0020] A servo motor is connected to the two dust removal rollers;

[0021] Several suction nozzles are arranged in a ring array around the dust collection box and connected to the negative pressure system.

[0022] In any of the above technical solutions, the dust removal mechanism is further provided with a dynamic adjustment system;

[0023] A particle counter is provided between the negative pressure system and the suction nozzle. The dynamic adjustment system is connected to both the particle counter and the negative pressure system. The dynamic adjustment system is used to adjust the power of the negative pressure system according to the result measured by the particle counter.

[0024] In any of the above technical solutions, the curing mechanism further includes:

[0025] A curing chamber is installed on the support frame, and the release paper conveying path passes through the curing chamber. The curing chamber is equipped with a mercury lamp.

[0026] A hot air drying chamber is installed on the support frame. The release paper conveying route passes through the hot air drying chamber. It is provided with a preheating chamber, a curing chamber and a cooling chamber in sequence. The temperature of the curing chamber is higher than the temperature of the preheating chamber, and the temperature of the cooling chamber is lower than the temperature of the preheating chamber.

[0027] In any of the above technical solutions, the calendering mechanism further includes:

[0028] A support roller is rotatably mounted on the bracket;

[0029] An electromagnetic induction calendering roller is mounted on the two supports.

[0030] The second pressurizing mechanism is connected to the electromagnetic induction calendering roller and is used to adjust the pressure between the electromagnetic induction calendering roller and the release paper.

[0031] A thickness measuring instrument is installed at the release paper exit point corresponding to the electromagnetic induction calendering roller;

[0032] The calendering control system is electrically connected to the thickness detector and the second pressurizing mechanism, respectively.

[0033] The beneficial effects are:

[0034] 1. The coating apparatus of this application measures the pressure between the metering roller and the release paper in real time by setting piezoelectric sensors at both ends of the metering roller. The thickness of the release paper is calculated based on the measured pressure to cope with the thickness change when coating the release agent. The pressure is adjusted according to the established pressure-thickness mapping model. The pressure of the back pressure roller is coarsely adjusted by the first pressurization mechanism and finely adjusted by the micro displacement device, so as to compress the coating thickness fluctuation to within ±0.5%, which significantly improves the manufacturing accuracy and yield of high value-added release film products.

[0035] 2. The coating device of this application is equipped with closed-loop dust removal. When the particle counter detects that the amount of dust per unit time is greater than a predetermined value, the dynamic adjustment system automatically controls the dust removal mechanism to increase the power, which can improve the dust removal efficiency to more than 98%. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a three-dimensional structural schematic diagram of a coating apparatus for producing release paper according to an embodiment of this application;

[0038] Figure 2 This is a cross-sectional structural schematic diagram of a coating apparatus for producing release paper according to an embodiment of this application.

[0039] The annotations in the attached figures are explained as follows:

[0040] 1. Bracket;

[0041] 2. Coating mechanism; 201. Anilox roller; 202. Metering roller; 203. Back pressure roller; 204. First pressure boosting mechanism;

[0042] 3. Dust removal mechanism; 301. Dust collection box; 302. Dust collection roller; 303. Suction nozzle; 304. Negative pressure system; 305. Particle counter;

[0043] 4. Curing mechanism; 401. Curing chamber; 402. Hot air drying oven; 403. Preheating chamber; 404. Curing chamber; 405. Cooling chamber;

[0044] 5. Calendering mechanism; 501. Support roller; 502. Electromagnetic induction calendering roller; 503. Second pressure boosting mechanism; 504. Thickness measuring instrument. Detailed Implementation

[0045] Hereinafter, exemplary embodiments according to this application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely a part of the embodiments of this application, and not all of the embodiments of this application. It should be understood that this application is not limited to the exemplary embodiments described herein. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0046] It should be noted that, as shown in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "an," and / or "the" do not specifically refer to the singular and may also include the plural. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of explicitly identified steps and elements, and these steps and elements do not constitute an exclusive list; the method or apparatus may also include other steps or elements.

[0047] If the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0048] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0049] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0050] The following embodiments will provide a detailed description of a coating apparatus for the production of release paper according to this application.

[0051] In this embodiment, as Figure 1 and Figure 2 As shown, the coating apparatus for producing release paper includes: a support 1 and a coating mechanism 2;

[0052] Coating mechanism 2 includes:

[0053] An anilox roller 201 is rotatably mounted on the bracket 1, with its lower side immersing in the release agent tank;

[0054] Metering roller 202 is rotatably mounted on bracket 1 and parallel to the upper side of anilox roller 201. Piezoelectric sensors are symmetrically arranged on both sides of metering roller 202. The piezoelectric sensors are used to measure the pressure between metering roller 202 and release paper.

[0055] The back pressure roller 203 is slidably mounted on the bracket 1 via a micro-displacement device and is arranged parallel to the upper side of the metering roller 202.

[0056] The first pressurizing mechanism 204 is mounted on the bracket 1 and connected to the back pressure roller 203, and is used to adjust the pressure between the back pressure roller 203 and the metering roller 202.

[0057] The pressure regulation system (not shown in the figure) is connected to the piezoelectric sensor, the micro-displacement device and the first pressure boosting mechanism 204 respectively. The pressure regulation system is used to infer the thickness of the release paper based on the pressure of the piezoelectric sensor and adjust the power of the first pressure boosting mechanism 204 and the micro-displacement device according to the measured thickness.

[0058] In this technical solution, the support 1 is set horizontally, and several guide rollers and tension rollers are provided on the upper side. For ease of description and demonstration, the dust removal mechanism 3, coating mechanism 2, curing mechanism 4 and calendering mechanism 5 are arranged from left to right in sequence. In actual installation, they can be staggered vertically to save layout space.

[0059] The anilox roller 201 is mounted on the bracket 1 via a bearing seat and is connected to a servo motor, rotating clockwise. The metering roller 202 is mounted on the bracket 1 via another bearing seat, located above the anilox roller 201. The metering roller 202 and the anilox roller 201 are in tangential contact, with an adjustable gap of 0.01-0.5mm. A piezoelectric sensor (not shown) is integrated into the bearing seat at the end of the metering roller 202 to monitor dynamic pressure fluctuations during coating transfer and provide real-time feedback to the pressure regulation system, reducing signal transmission distance. The pressure regulation system infers the coating thickness based on the pressure.

[0060] The back pressure roller 203 is mounted on the support 1 via a bearing seat, located above the metering roller 202 and in the coating pressure zone of the metering roller 202. A micro-displacement device (not shown in the figure) is integrated into the bearing seat of the back pressure roller 203. The micro-displacement device has a stroke of ±5mm and a resolution of 0.1µm. The micro-displacement device uses a piezoelectric ceramic actuator or a precision lead screw. The first pressure boosting mechanism 204 is an electro-hydraulic cylinder with a pressure range of 0-10MPa. The pressure range of the coarse adjustment back pressure roller 203 is 5-50KN / m, and the response time is 50ms. The release paper is first coated with adhesive through the gap between the anilox roller 201 and the metering roller 202, and then initially flattened through the gap between the metering roller 202 and the back pressure roller 203.

[0061] The pressure-thickness mapping model shows the relationship between coating thickness and pressure as follows:

[0062] Where F is the detection pressure, is the release agent viscosity, D is the diameter of the anilox roller 201, L is the roller surface contact length, and v is the production line speed.

[0063] During adjustment, the hydraulic coarse adjustment is first performed, with the hydraulic mechanism responding quickly to sudden changes in substrate thickness and adjusting the oil pressure through a PID algorithm; then the micro-displacement device is performed for fine adjustment, compensating for thermal deformation of the roller and mechanical clearance.

[0064] In this embodiment, it also includes:

[0065] Dust removal mechanism 3 is mounted on bracket 1. Compared with coating mechanism 2, dust removal mechanism 3 is located on the side away from the release paper output end.

[0066] Curing mechanism 4 is located on bracket 1. Compared with coating mechanism 2, curing mechanism 4 is located on the side closer to the release paper output end.

[0067] Calendering mechanism 5 is located on support 1. Compared with curing mechanism 4, calendering mechanism 5 is located on the side closer to the release paper output end.

[0068] In this technical solution, the dust removal mechanism 3 is located on the left side of the coating mechanism 2, the curing mechanism 4 is located on the right side of the coating mechanism 2, and the calendering mechanism 5 is located on the right side of the curing mechanism 4. The dust removal mechanism 3 is set up to adsorb dust on the production line, reducing the impact of dust on the coating process. The curing mechanism 4 is set up to increase the curing speed of the release agent, and the calendering mechanism 5 is set up to improve the surface smoothness.

[0069] In this embodiment, the dust removal mechanism 3 includes:

[0070] Dust collection box 301 is installed on bracket 1, and the release paper conveying route passes through dust collection box 301;

[0071] Two dust removal rollers 302 are symmetrically arranged inside the dust removal box 301, and carbon fiber bristles are inlaid on the surface.

[0072] A servo motor (not shown in the figure) is connected to two dust removal rollers 302;

[0073] Several suction nozzles 303 are arranged in a ring array around the dust collection box 301 and connected to the negative pressure system 304.

[0074] In this technical solution, the substrate, guided by the guide roller on the left, passes through the dust collection box 301 to the right. The dust collection box 301 is rectangular and positioned in the middle of the support 1. A ring of suction nozzles 303 is evenly arranged on the top, bottom, front, and back sides. The suction nozzles 303 are connected to a negative pressure system 304 via pipes. The negative pressure system 304 includes a negative pressure generator and a controller. A filter cartridge is installed on the pipe between the negative pressure generator and the suction nozzles 303. Two dust collection rollers 302 are symmetrically arranged inside the dust collection box 301. The dust collection rollers 302 are chrome-plated steel rollers with spiral carbon fiber bristles embedded in their surface, with a bristle density of 120 bristles / cm². A servo motor is connected to the two dust collection rollers 302 via a gear set, driving the two dust collection rollers 302 to move towards each other.

[0075] In this embodiment, the dust removal mechanism 3 is also equipped with a dynamic adjustment system (not shown in the figure);

[0076] The dust collection box 301 is equipped with a particle counter 305. The dynamic adjustment system is connected to the particle counter 305 and the negative pressure system 304 respectively. The dynamic adjustment system is used to adjust the power of the negative pressure system 304 according to the result measured by the particle counter 305.

[0077] In this technical solution, the particle counter 305 is fixed on the side wall of the dust collector 301, communicates with the internal space of the dust collector 301, and is electrically connected to the controller of the negative pressure system 304 to detect the number concentration of ≥5μm particles in the air after dust removal in real time.

[0078] The dynamic adjustment system (not shown in the diagram) has two concentration thresholds: a warning threshold (e.g., ≥5000 particles / m³) and a critical threshold (e.g., ≥8000 particles / m³). When the particle counter 305 detects that the concentration exceeds the critical threshold, the negative pressure power is increased to the preset maximum value (90% of the rated power); if it is within the warning threshold range, the power is adjusted proportionally (50%-80% of the rated power). When the concentration is below 80% of the warning threshold (i.e., ≤4000 particles / m³) for 10 consecutive seconds, the power is gradually reduced to the baseline value (40% of the rated power) to avoid frequent fluctuations.

[0079] In this embodiment, the curing mechanism 4 includes:

[0080] Curing box 401 is set on bracket 1. The release paper conveying route passes through curing box 401. Curing box 401 is equipped with mercury lamp.

[0081] Hot air drying chamber 402 is set on support 1. The release paper conveying route passes through hot air drying chamber 402. It is provided with preheating chamber 403, curing chamber 404 and cooling chamber 405 in sequence. The temperature of curing chamber 404 is higher than the temperature of preheating chamber 403, and the temperature of cooling chamber 405 is lower than the temperature of preheating chamber 403.

[0082] In this technical solution, the curing box 401 is located on the right side of the coating mechanism 2, and three sets of mercury lamps are provided on the top. The intensity of the mercury lamps is 1200mJ / cm², which is used to initially cure the release paper.

[0083] The hot air drying oven 402 is located on the right side of the curing oven 401. It is divided into three chambers from left to right: a preheating chamber 403, a curing chamber 404, and a cooling chamber 405. The side walls of the chambers are provided with openings for the release paper to pass through. Guide rollers are provided on both sides of the hot air drying oven 402 to guide and support the movement of the release paper. The working temperature of the preheating chamber 403 is 80℃, the temperature of the curing chamber 404 is 120℃, and the temperature of the cooling chamber 405 is 60℃. During use, hot air of the corresponding temperature is introduced into the different chambers.

[0084] In this embodiment, the calendering mechanism 5 includes:

[0085] The support roller 501 is rotatably mounted on the bracket 1;

[0086] The electromagnetic induction calendering roller 502 is mounted on two supports 1;

[0087] The second pressure-boosting mechanism 503 is connected to the electromagnetic induction calendering roller 502 and is used to adjust the pressure between the electromagnetic induction calendering roller 502 and the release paper.

[0088] Thickness measuring instrument 504 is installed at the release paper exit point corresponding to the electromagnetic induction calendering roller 502;

[0089] The calendering control system (not shown in the figure) is electrically connected to the thickness measuring instrument 504 and the second pressurizing mechanism 503.

[0090] In this technical solution, the support roller 501 is horizontally mounted on the bracket 1 via a motor drive. The electromagnetic induction calendering roller 502 is horizontally mounted above the support roller 501. The second pressure-increasing mechanism 503 has a similar structure to the first pressure-increasing mechanism 204. The micro-displacement device of the second pressure-increasing mechanism 503 is integrated into the bearing housing on which the electromagnetic induction calendering roller 502 is mounted. The hydraulic mechanism of the second pressure-increasing mechanism 503 is mounted on the bracket 1 and connected to the electromagnetic induction calendering roller 502. The pressure value output downward by the electromagnetic induction calendering roller 502 is adjusted through the second pressure-increasing mechanism 503. The electromagnetic induction calendering roller 502 has a built-in electromagnetic induction heater with a temperature control accuracy of ±2℃. The thickness gauge 504 is a β-ray thickness gauge, which is commercially available, and is located on the right side of the release paper exit at the support roller 501.

[0091] The thickness detector 504 monitors the release paper exit thickness in real time, with a sampling frequency ≥100Hz. The data is filtered and then transmitted to the calendering control system. Simultaneously, the temperature of the electromagnetic induction calendering roller 502 and the pressure value of the second pressure-boosting mechanism 503 are collected by a temperature sensor inside the calendering roller. The calendering control system performs PID pressure adjustment based on the detected temperature and pressure values. The hydraulic mechanism of the second pressure-boosting mechanism 503 is responsible for coarse adjustment within a ±5mm stroke, while the micro-displacement device integrated in the bearing housing performs fine adjustment at the ±0.1μm level to compensate for mechanical clearance and thermal deformation.

[0092] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A coating apparatus for the production of release paper, characterized in that, include: Support (1) and coating mechanism (2); The coating mechanism (2) includes: An anilox roller (201) is rotatably mounted on the bracket (1), with its lower side immersing in the release agent tank; The metering roller (202) is rotatably mounted on the bracket (1) and parallel to the upper side of the anilox roller (201). Piezoelectric sensors are symmetrically arranged on both sides of the metering roller (202), and the piezoelectric sensors are used to measure the pressure between the metering roller (202) and the release paper. The back pressure roller (203) is slidably mounted on the bracket (1) via a micro-displacement device and is parallel to the upper side of the metering roller (202). The first pressurizing mechanism (204) is disposed on the bracket (1) and connected to the back pressure roller (203) for adjusting the pressure between the back pressure roller (203) and the metering roller (202); The pressure regulation system is connected to the piezoelectric sensor, the micro-displacement device and the first pressure boosting mechanism (204) respectively. The pressure regulation system is used to infer the thickness of the release paper based on the pressure of the piezoelectric sensor and adjust the power of the first pressure boosting mechanism (204) and the micro-displacement device according to the measured thickness.

2. The coating apparatus for release paper production according to claim 1, characterized in that, Also includes: The dust removal mechanism (3) is located on the support (1). Compared with the coating mechanism (2), the dust removal mechanism (3) is located on the side away from the release paper output end. The curing mechanism (4) is located on the support (1). Compared with the coating mechanism (2), the curing mechanism (4) is located on the side closer to the release paper output end. Calendering mechanism (5) is disposed on the support (1). Compared with curing mechanism (4), calendering mechanism (5) is disposed on the side closer to the release paper output end.

3. The coating apparatus for release paper production according to claim 2, characterized in that, The dust removal mechanism (3) includes: A dust collector (301) is installed on the support (1), and the release paper conveying path passes through the dust collector (301); Two dust removal rollers (302) are symmetrically arranged inside the dust removal box (301), and carbon fiber bristles are inlaid on the surface; A servo motor is connected to the two dust removal rollers (302); Several suction nozzles (303) are arranged in a ring array around the dust collection box (301) and connected to the negative pressure system (304).

4. The coating apparatus for release paper production according to claim 3, characterized in that, The dust removal mechanism (3) is also equipped with a dynamic adjustment system; The dust collection box (301) is equipped with a particle counter (305). The dynamic adjustment system is connected to the particle counter (305) and the negative pressure system (304) respectively. The dynamic adjustment system is used to adjust the power of the negative pressure system (304) according to the result measured by the particle counter (305).

5. The coating apparatus for producing release paper according to claim 2, characterized in that, The curing mechanism (4) includes: A curing box (401) is provided on the support (1), and the release paper conveying route passes through the curing box (401). The curing box (401) is equipped with a mercury lamp. A hot air drying oven (402) is installed on the support (1). The release paper conveying route passes through the hot air drying oven (402). A preheating chamber (403), a curing chamber (404), and a cooling chamber (405) are provided in sequence. The temperature of the curing chamber (404) is higher than the temperature of the preheating chamber (403), and the temperature of the cooling chamber (405) is lower than the temperature of the preheating chamber (403).

6. The coating apparatus for producing release paper according to claim 2, characterized in that, The calendering mechanism (5) includes: The support roller (501) is rotatably mounted on the bracket (1); An electromagnetic induction calendering roller (502) is mounted on the two supports (1); The second pressure-boosting mechanism (503) is connected to the electromagnetic induction calendering roller (502) and is used to adjust the pressure between the electromagnetic induction calendering roller (502) and the release paper; A thickness measuring instrument (504) is installed at the release paper exit point corresponding to the electromagnetic induction calendering roller (502); The calendering control system is electrically connected to the thickness detector (504) and the second pressurizing mechanism (503), respectively.

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