Aramid paper hot pressing device and aramid paper hot pressing debugging method

Abstract

The application discloses an aramid paper hot-pressing device and an aramid paper hot-pressing debugging method, and belongs to the technical field of aramid paper preparation. The aramid paper hot-pressing device comprises a rack, a hot-pressing mechanism and a blowing mechanism. The hot-pressing mechanism comprises an upper roller and a lower roller, the upper roller and the lower roller are installed on the rack in parallel and can rotate, and the lower roller and the upper roller are spaced apart to allow aramid paper to pass through. The blowing mechanism comprises an air pipe and a nozzle. The air pipe is installed on the rack and is arranged in parallel and spaced apart from the lower roller. The air pipe is connected to an inert gas supply device. A plurality of nozzles are connected to the air pipe in the length direction of the air pipe. The plurality of nozzles can be selectively opened or closed. The aramid paper hot-pressing device can open nozzles at different positions according to the defects of the roller, so as to spray inert gas to different positions of the lower roller, thereby reducing the probability of the flatness of the aramid paper not meeting the standard due to the defects of the roller, prolonging the service life of the roller and reducing the maintenance cost.

Description

Technical Field

[0001] This application relates to the field of aramid paper preparation technology, specifically to an aramid paper hot pressing device and an aramid paper hot pressing debugging method. Background Technology

[0002] Aramid paper is widely used in national defense, aerospace, transportation and other fields due to its advantages such as high strength, low deformation, high temperature resistance, chemical corrosion resistance, flame retardancy, excellent insulation, extremely stable chemical properties and long service life.

[0003] In the preparation of aramid paper, a hot pressing device is required for high-temperature and high-pressure roller pressing to achieve high-density crystal transformation and ensure that the flatness of the aramid paper meets the requirements. The flatness of aramid paper is an important indicator of its quality. When the rollers of the hot pressing device have heat deformation defects or temperature accuracy defects, it will seriously affect the flatness of the aramid paper. The rollers need to be replaced in time, and the replaced rollers need to be returned to the factory for repair or discarded, which makes the maintenance cost of the hot pressing device high.

[0004] Therefore, there is an urgent need for a hot pressing device for aramid paper to solve the above problems. Summary of the Invention

[0005] One object of this application is to solve or at least alleviate some or all of the aforementioned problems. Therefore, one object of this application is to provide an aramid paper hot pressing apparatus and a method for adjusting the aramid paper hot pressing process.

[0006] To achieve the above objectives, this application adopts the following technical solution:

[0007] In a first aspect, an aramid paper hot pressing apparatus is provided, comprising:

[0008] frame;

[0009] The hot pressing mechanism includes an upper roller and a lower roller, which are mounted on the frame in parallel and rotatable order. There is a gap between the lower roller and the upper roller for aramid paper to pass through.

[0010] The air blowing mechanism includes an air pipe and nozzles. The air pipe is mounted on the frame and is arranged parallel to and spaced apart from the lower roller. The air pipe is used to connect to an inert gas supply device. A plurality of nozzles are spaced apart on the air pipe along its length. The plurality of nozzles can be selectively opened or closed to adjust the position and number of nozzles that spray inert gas onto the lower roller.

[0011] As an optional embodiment of the aramid paper hot pressing device, all the nozzles are located on the paper feed side of the lower roller.

[0012] As an optional embodiment of the aramid paper hot pressing device, the air blowing mechanism further includes an adjuster, wherein the nozzle is movably mounted on the frame, and the adjuster is used to drive the nozzle to move relative to the lower roller to adjust the distance between the nozzle and the lower roller and the spray direction of the nozzle.

[0013] As an optional solution for the aramid paper hot pressing device, the air blowing mechanism further includes a corrugated pipe, and the nozzle is connected to the air pipe through the corrugated pipe.

[0014] As an optional feature of the aramid paper hot pressing device, the nozzle has a switching valve for opening or closing the nozzle.

[0015] As an optional feature of the aramid paper hot pressing device, the spray range of all the nozzles completely covers the axial length of the lower roller.

[0016] Secondly, a method for hot-pressing and adjusting aramid paper is provided, based on the aramid paper hot-pressing apparatus as described in any of the preceding claims, the method comprising the following steps:

[0017] S100, Select aramid paper for testing;

[0018] S200, Select a hot pressing device for commissioning;

[0019] S300. Use a hot pressing device to hot press aramid paper. During the hot pressing process, all nozzles are closed. After hot pressing, observe and record the surface flatness U1 of the aramid paper. Then, use the same hot pressing device to hot press the same type of aramid paper. During the hot pressing process, adjust the position and spray angle of the nozzles according to the surface flatness U1, and open the required nozzles. After hot pressing, observe and record the surface flatness U2 of the aramid paper.

[0020] S400. Compare the surface flatness U1 with the surface flatness U2, and record the usage time of the corresponding hot pressing device, the thickness of the aramid paper, the position of the nozzle in the open state, and the spray angle.

[0021] As an optional solution for the hot pressing and debugging method of the aramid paper, in step S100, aramid paper with a thickness between 0.04 mm and 0.08 mm and a basis weight between 24.5 g / m² and 63 g / m² is recorded as aramid paper of the same type; aramid paper with a thickness between 0.13 mm and 0.38 mm and a basis weight between 115 g / m² and 360 g / m² is recorded as aramid paper of the same type.

[0022] As an optional scheme for the hot pressing and debugging method of the aramid paper, in step S300, for aramid paper with a thickness between 0.04 mm and 0.08 mm and a basis weight between 24.5 g / m² and 63 g / m², the hot pressing temperature is between 200°C and 350°C, and the linear pressure is between 55 N / mm and 220 N / mm; for aramid paper with a thickness between 0.13 mm and 0.38 mm and a basis weight between 115 g / m² and 360 g / m², the hot pressing temperature is between 250°C and 350°C, and the linear pressure is between 110 N / mm and 420 N / mm.

[0023] As an optional solution for the hot pressing and debugging method of aramid paper, in step S200, the hot pressing device is divided into a hot pressing device with a usage time of less than three months and a hot pressing device with a usage time of three months or more.

[0024] The beneficial effects of this application are as follows:

[0025] The aramid paper hot-pressing device provided in this application includes a frame, a hot-pressing mechanism, and an air-blowing mechanism. The hot-pressing mechanism includes an upper roller and a lower roller, which are mounted on the frame in a parallel and rotatable manner. A gap exists between the lower roller and the upper roller for the aramid paper to pass through. The air-blowing mechanism includes an air pipe and nozzles. The air pipe is mounted on the frame and spaced parallel to the lower roller. The air pipe is used to connect to an inert gas supply device. Multiple nozzles are spaced along the length of the air pipe and can be selectively opened or closed to adjust the position and number of nozzles spraying inert gas downwards onto the roller. This aramid paper hot-pressing device can open nozzles at different positions according to the defects of the roller, thereby achieving the spraying of inert gas at different positions on the downward-facing roller. This reduces the probability of substandard aramid paper flatness caused by roller defects, extends the service life of the roller, and reduces maintenance and replacement costs.

[0026] The aramid paper hot pressing debugging method provided in this application, based on the above-mentioned aramid paper hot pressing device, can obtain the optimal operating parameters for the same type of aramid paper with different thicknesses and different hot pressing devices by multiple debugging and comparison of debugging results, so as to improve the phenomenon of substandard flatness caused by roller defects. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this application and these drawings without creative effort.

[0028] Figure 1This is a front view schematic diagram of the aramid paper hot pressing device provided in the embodiments of this application;

[0029] Figure 2 This is a schematic diagram of the aramid paper hot pressing device (without frame) provided in the embodiments of this application;

[0030] Figure 3 This is a side view schematic diagram of the aramid paper hot pressing device provided in the embodiments of this application;

[0031] Figure 4 These are schematic diagrams of the nozzle in different states provided in the embodiments of this application.

[0032] Figure label:

[0033] 100. Rack;

[0034] 200. Hot pressing mechanism; 201. Upper roller; 202. Lower roller;

[0035] 300. Air blowing mechanism; 301. Air pipe; 302. Nozzle; 3021. Switch valve; 303. Bellows;

[0036] 400. Tensioning roller. Detailed Implementation

[0037] Before explaining any implementation of this application in detail, it should be understood that this application is not limited to its application to the structural details and component arrangements set forth in the following description or shown in the above drawings.

[0038] In this application, the terms "comprising," "including," "having," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0039] In this application, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this application generally indicates that the preceding and following related objects have an "and / or" relationship.

[0040] In this application, those skilled in the art will understand that relative terms (e.g., “about,” “approximately,” “basically,” etc.) used in conjunction with quantities or conditions are to include the values ​​and have the meaning indicated by the context. For example, such relative terms include at least the degree of error associated with the measurement of a particular value, tolerances associated with the particular value due to manufacturing, assembly, use, etc. Such terms should also be considered as disclosing a range defined by the absolute values ​​of the two endpoints.

[0041] In this application, the directional terms "upper," "lower," "left," "right," "front," and "rear" are used to describe the orientation and positional relationships shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when an element is mentioned as being connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected through an intermediate element. It should also be understood that directional terms such as upper side, lower side, left side, right side, front side, and rear side not only represent positive orientation but can also be understood as lateral orientation. For example, "below" can include directly below, lower left, lower right, lower front, and lower rear.

[0042] Figure 1 A front view schematic diagram of the aramid paper hot pressing apparatus provided in this application is shown. Figure 2 A schematic diagram of the aramid paper hot pressing apparatus (omitting frame 100) provided in this application is shown. Figures 1 to 2 As shown, the aramid paper hot pressing device provided in this application includes a frame 100, a hot pressing mechanism 200, and an air blowing mechanism 300. The hot pressing mechanism 200 includes an upper roller 201 and a lower roller 202, which are mounted on the frame 100 in parallel and rotatable configurations. There is a gap between the lower roller 202 and the upper roller 201 for the aramid paper to pass through. The air blowing mechanism 300 includes an air pipe 301 and nozzles 302. The air pipe 301 is mounted on the frame 100 and is parallel to and spaced apart from the lower roller 202. The air pipe 301 is used to connect to an inert gas supply device. Multiple nozzles 302 are spaced apart on the air pipe 301 along its length. The multiple nozzles 302 can be selectively opened or closed to adjust the position and number of nozzles 302 that spray inert gas onto the lower roller 202. The aramid paper hot pressing device can open nozzles 302 at different positions according to the defects of the rollers (i.e., upper roller 201 and / or lower roller 202) to spray inert gas at different positions of the lower roller 202. This reduces the probability that the aramid paper flatness does not meet the requirements due to roller defects, extends the service life of the rollers, and reduces maintenance and replacement costs.

[0043] In one embodiment, the number of nozzles 302 can be any value between 2 and 20, such as 2, 5, 8, 10, 12, 14, 16, 18, 20, etc., as long as the spray range of all nozzles 302 completely covers the axial length of the lower roller 202. The specific arrangement can be made as needed and is not limited here.

[0044] In one embodiment, all nozzles 302 are located above the axis of the lower roller 202 so that the nozzles 302 can spray inert gas at the hot-pressing position of the lower roller 202.

[0045] Figure 3 A side view schematic diagram of the aramid hot pressing apparatus provided in this application is shown. Figure 3 As shown, the aramid hot pressing device also includes a tension roller 400, which is located on the paper feed side of the lower roller 202 and is used to support the aramid paper to ensure that the aramid paper enters the gap between the upper roller 201 and the lower roller 202 smoothly and stably. During assembly, the aramid paper first passes through the tension roller 400 and then passes through the gap between the upper roller 201 and the lower roller 202.

[0046] In one embodiment, all nozzles 302 are located on the paper feed side of the lower roller 202. Compared with installing the nozzles 302 on the paper output side of the lower roller 202 and below the lower roller 202, the impact of the roller's thermal deformation defects and temperature accuracy defects on the aramid paper can be improved in a timely manner, the service life of the roller can be extended, and the cost can be reduced.

[0047] Understandably, the aramid paper hot pressing device also includes an unwinding roll and a take-up roll. The unwinding roll is located upstream of the tension roll 400, and the take-up roll is located downstream of the upper roll 201 and the lower roll 202. The aramid paper before hot pressing is mounted on the unwinding roll, and one end of the aramid paper passes sequentially through the gaps between the tension roll 400, the upper roll 201, and the lower roll 202 before being wound up by the take-up roll.

[0048] Figure 4 A schematic diagram of the nozzle 302 provided in this application in different states is shown. Figure 4 As shown, the blowing mechanism 300 also includes an adjuster. The nozzle 302 is movably mounted on the frame 100. The adjuster is used to drive the nozzle 302 to move relative to the lower roller 202 to adjust the distance between the nozzle 302 and the lower roller 202 and the spray direction of the nozzle 302, so as to precisely adjust the angle and range of the nozzle 302 spraying inert gas onto the lower roller 202.

[0049] The air blowing mechanism 300 also includes a bellows 303, through which the nozzle 302 is connected to the air pipe 301. When the regulator is used to drive the nozzle 302 to move relative to the lower roller 202, the bellows 303 can adaptively extend, shorten, and bend to adapt to the movement of the nozzle 302.

[0050] In one embodiment, the number of regulators is the same as the number of nozzles 302, and each nozzle 302 is equipped with one regulator to adjust the position and spray angle of a single nozzle 302.

[0051] In another embodiment, there is one regulator. All nozzles 302 are mounted on a bracket, which is then movably mounted on the frame 100. The regulator can simultaneously adjust the distance of all nozzles 302 relative to the lower roller 202 and the spray angle of the nozzles 302 by driving the bracket to move relative to the lower roller 202.

[0052] To facilitate control of the opening and closing of nozzle 302, nozzle 302 has a switching valve 3021, which is used to open or close nozzle 302. It is understood that the aramid paper hot pressing device also includes an input screen and a control system. The switching valve 3021 is communicatively connected to the control system. The operator inputs operating commands on the input screen, and the control system can open or close nozzles 302 at different positions according to the operating commands.

[0053] In one embodiment, the on / off valve 3021 on the nozzle 302 has 10 adjustable levels, which can adjust the air volume as needed to improve the fine control of the nozzle 302 and improve roller defects in different situations.

[0054] It should be noted that the defects of the roller are related to the flatness of the finished aramid paper. When there are local thickness variations in the balance of the aramid paper, the number of nozzles 302 opened, the angle of nozzles 302 and the air volume, as well as the distance between nozzles 302 and the lower roller 202 can be adjusted according to the defect size and defect depth to improve the flatness of the finished aramid paper.

[0055] This application provides an aramid paper hot pressing device, which compensates for local defects in the lower roller 202 (such as temperature differences, thermal expansion differences, etc.) by locally cooling the lower roller 202, ensuring that the thickness of the aramid paper is uniform after hot pressing, thereby improving the flatness of the aramid paper after hot pressing, reducing defects in the finished product, reducing the number of roller replacements and maintenance, reducing production costs, and improving product competitiveness.

[0056] Based on the above-mentioned aramid paper hot pressing device, this application also provides a method for hot pressing and debugging aramid paper, including the following steps:

[0057] S100, Select aramid paper for testing;

[0058] S200, Select a hot pressing device for commissioning;

[0059] S300. Use a hot pressing device to hot press aramid paper. During the hot pressing process, all nozzles 302 are closed. After hot pressing, observe and record the surface flatness U1 of the aramid paper. Then, use the same hot pressing device to hot press the same type of aramid paper. During the hot pressing process, adjust the position and spray angle of the nozzles 302 according to the surface flatness U1, and open the required nozzles 302. After hot pressing, observe and record the surface flatness U2 of the aramid paper.

[0060] S400. Compare surface flatness U1 with surface flatness U2, and record the usage time of the corresponding hot pressing device, the thickness of the aramid paper, the position of the nozzle 302 in the open state, and the spray angle.

[0061] This hot pressing debugging method for aramid paper, through multiple debugging sessions and comparison of debugging results, can obtain the optimal operating parameters for the same type of aramid paper with different thicknesses and different hot pressing devices, thereby improving the phenomenon of substandard flatness caused by roller defects.

[0062] In step S100, aramid paper with a thickness between 0.04 mm and 0.08 mm and a basis weight between 24.5 g / m² and 63 g / m² is categorized as aramid paper of the same type; aramid paper with a thickness between 0.13 mm and 0.38 mm and a basis weight between 115 g / m² and 360 g / m² is categorized as aramid paper of the same type.

[0063] In step S300, for aramid paper (referred to as thin paper) with a thickness between 0.04 mm and 0.08 mm and a basis weight between 24.5 g / m² and 63 g / m², the hot-pressing temperature is between 200°C and 350°C, and the linear pressure is between 55 N / mm and 220 N / mm; for aramid paper (referred to as thick paper) with a thickness between 0.13 mm and 0.38 mm and a basis weight between 115 g / m² and 360 g / m², the hot-pressing temperature is between 250°C and 350°C, and the linear pressure is between 110 N / mm and 420 N / mm.

[0064] In step S200, the hot pressing device is divided into a hot pressing device that has been in use for less than three months (referred to as new equipment) and a hot pressing device that has been in use for three months or more (referred to as old equipment).

[0065] Next, taking the aramid paper used for debugging, which includes both thin paper and thick paper, and the hot pressing device, which includes both new equipment and old equipment, as examples, with the thin paper having a thickness of 0.04 mm and the thick paper having a thickness of 0.13 mm, the debugging method of the hot pressing device provided in this application will be further explained.

[0066] S1. Select aramid paper of different thicknesses and divide it into thin paper and thick paper.

[0067] S2. Select hot pressing devices with different usage times, divided into new equipment and old equipment.

[0068] S3. Use the new equipment to hot press the thin paper, observe and record the surface flatness U11 of the thin paper after hot pressing; use the same new equipment to hot press the thin paper of the same thickness, and adjust the nozzle 302 to a suitable angle for local temperature adjustment, observe and record the surface flatness U12 of the thin paper after hot pressing, and finally compare the surface flatness of the thin paper after the two hot pressings.

[0069] S4. Use the old equipment to hot press the thin paper, observe and record the surface flatness U21 of the thin paper after hot pressing; use the same new equipment to hot press the thin paper of the same thickness, and adjust the nozzle 302 to a suitable angle for local temperature adjustment, observe and record the surface flatness U22 of the thin paper after hot pressing, and finally compare the surface flatness of the thin paper after the two hot pressings.

[0070] S5. Use the new equipment to hot press the thick paper, observe and record the surface flatness U31 of the thick paper after hot pressing; use the same new equipment to hot press the thick paper of the same thickness, and adjust the nozzle 302 to a suitable angle for local temperature adjustment, observe and record the surface flatness U32 of the thick paper after hot pressing, and finally compare the surface flatness of the thick paper after the two hot pressings.

[0071] S6. Use the old equipment to hot press the thick paper, observe and record the surface flatness U41 of the thick paper after hot pressing; use the same new equipment to hot press the thick paper of the same thickness, and adjust the nozzle 302 to a suitable angle for local temperature adjustment, observe and record the surface flatness U42 of the thick paper after hot pressing, and finally compare the surface flatness of the thick paper after the two hot pressings.

[0072] Based on the above hot-press debugging method, 10 test points are selected and recorded in each step, as shown in the debugging data table below.

[0073]

[0074] As shown in the table above, after the local cooling of the lower roller 202 was implemented, the thickness fluctuation dispersion coefficients of thin paper (0.04 mm) and thick paper (0.13 mm) were significantly reduced, indicating that the flatness of the aramid paper was improved.

[0075] The foregoing has shown and described the basic principles, main features, and advantages of this application. Those skilled in the art should understand that the above embodiments do not limit this application in any way, and all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of this application.

Claims

1. A hot pressing device for aramid paper, characterized in that, include: Rack (100); The hot pressing mechanism (200) includes an upper roller (201) and a lower roller (202). The upper roller (201) and the lower roller (202) are mounted on the frame (100) in a parallel and rotatable manner. There is a gap between the lower roller (202) and the upper roller (201) for aramid paper to pass through. The air blowing mechanism (300) includes an air pipe (301) and nozzles (302). The air pipe (301) is mounted on the frame (100) and is arranged parallel to and spaced apart from the lower roller (202). The air pipe (301) is used to connect to an inert gas supply device. A plurality of nozzles (302) are spaced apart on the air pipe (301) along the length direction of the air pipe (301). The plurality of nozzles (302) can be selectively opened or closed to adjust the position and number of nozzles (302) that spray inert gas onto the lower roller (202), thereby compensating for local defects of the upper roller (201) and the lower roller (202), ensuring that the thickness of the aramid paper is uniform after hot pressing, and thus improving the flatness of the aramid paper after hot pressing.

2. The aramid paper hot pressing device according to claim 1, characterized in that, All of the nozzles (302) are located on the paper feed side of the lower roller (202).

3. The aramid paper hot pressing apparatus according to claim 2, characterized in that, The blowing mechanism (300) further includes an adjuster, the nozzle (302) is movably mounted on the frame (100), and the adjuster is used to drive the nozzle (302) to move relative to the lower roller (202) to adjust the distance between the nozzle (302) and the lower roller (202) and the spray direction of the nozzle (302).

4. The aramid paper hot pressing device according to claim 3, characterized in that, The air blowing mechanism (300) also includes a bellows (303), and the nozzle (302) is connected to the air pipe (301) through the bellows (303).

5. The aramid paper hot pressing apparatus according to claim 3, characterized in that, The nozzle (302) has a switching valve (3021) for opening or closing the nozzle (302).

6. The aramid paper hot pressing apparatus according to claim 3, characterized in that, The spray range of all the nozzles (302) completely covers the axial length of the lower roller (202).

7. A method for hot-pressing and adjusting aramid paper, characterized in that, Based on the aramid paper hot pressing apparatus according to any one of claims 1-6, the aramid paper hot pressing debugging method includes the following steps: S100, Select aramid paper for testing; S200, Select a hot pressing device for commissioning; S300. Use a hot pressing device to hot press aramid paper. During the hot pressing process, all the nozzles (302) are closed. After the hot pressing is completed, observe and record the surface flatness U1 of the aramid paper after hot pressing. Then, use the same hot pressing device to hot press the same type of aramid paper. During the hot pressing process, adjust the position and spray angle of the nozzles (302) according to the surface flatness U1, and open the required nozzles (302). After the hot pressing is completed, observe and record the surface flatness U2 of the aramid paper after hot pressing. S400. Compare the surface flatness U1 with the surface flatness U2, and record the usage time of the corresponding hot pressing device, the thickness of the aramid paper, the position of the nozzle (302) in the open state, and the spray angle.

8. The hot-pressing and debugging method for aramid paper according to claim 7, characterized in that, In step S100, aramid paper with a thickness between 0.04 mm and 0.08 mm and a basis weight between 24.5 g / m² and 63 g / m² is categorized as aramid paper of the same type; aramid paper with a thickness between 0.13 mm and 0.38 mm and a basis weight between 115 g / m² and 360 g / m² is categorized as aramid paper of the same type.

9. The hot-pressing and debugging method for aramid paper according to claim 8, characterized in that, In step S300, for aramid paper with a thickness between 0.04 mm and 0.08 mm and a basis weight between 24.5 g / m² and 63 g / m², the hot-pressing temperature is between 200°C and 350°C, and the linear pressure is between 55 N / mm and 220 N / mm; for aramid paper with a thickness between 0.13 mm and 0.38 mm and a basis weight between 115 g / m² and 360 g / m², the hot-pressing temperature is between 250°C and 350°C, and the linear pressure is between 110 N / mm and 420 N / mm.

10. The hot-pressing and debugging method for aramid paper according to claim 7, characterized in that, In step S200, the hot pressing device is divided into a hot pressing device with a usage time of less than three months and a hot pressing device with a usage time of three months or more.

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