A hot air drying apparatus for coated paper

Abstract

The application provides a kind of hot air drying equipment of coated paper, the hot air drying equipment includes hot air box, air outlet plate, air return plate and air return cover;The air outlet plate is connected with the hot air box, the air outlet plate is equipped with air outlet hole, the hot gas flow in the hot air box can be blown out through the air outlet hole;The air return plate is arranged adjacent to the air outlet plate, the air return plate is equipped with air return channel, the surface of the air return plate is equipped with air return hole, the air return hole is communicated with the air return channel, the airflow after cooling after coated paper enters the air return channel through the air return hole;The air return cover is covered on the surface of the air return plate, and is arranged corresponding to the air return hole.The hot air drying equipment of coated paper provided by the embodiment of the application has the characteristics of simple structure, easy to clean paper scraps, low maintenance cost of complete machine and the like.

Description

Technical Field

[0001] This application relates to the technical field of papermaking equipment, specifically to a hot air drying device for coated paper. Background Technology

[0002] The coating air-cushion hot air box is a crucial unit in coating paper machines used to dry the coated layer during the coating process. Hot air heats the coated paper, causing the moisture in the coating to evaporate and thus solidify the coating to achieve the desired coating effect. The air-cushion design reduces direct contact between the paper and the hot air box, preventing blistering, deformation, or damage to the paper due to uneven heating or excessive pressure, while also improving production efficiency and coating quality. However, conventional hot air box structures suffer from complex structures and inconvenient cleaning. Utility Model Content

[0003] The first aspect of this application provides a hot air drying device for coated paper, the hot air drying device including a hot air box, an air outlet plate, a return air plate, and a return air hood; the air outlet plate is connected to the hot air box, and the air outlet plate is provided with air outlet holes, through which the hot air flow in the hot air box can be blown out; the return air plate is disposed adjacent to the air outlet plate, the return air plate is provided with a return air channel, and the surface of the return air plate is provided with return air holes, the return air holes communicating with the return air channel, the air flow after being cooled by the coated paper enters the return air channel through the return air holes; the return air hood is disposed on the surface of the return air plate and is provided corresponding to the return air holes.

[0004] In some optional embodiments, there are multiple air outlet plates arranged in parallel at intervals, and multiple return air plates arranged alternately with the air outlet plates.

[0005] In some optional embodiments, the return air hood has an n-shaped cross-section, including a top wall and a first side wall and a second side wall integrally extended from both sides of the top wall, and the top wall is provided with ventilation holes.

[0006] In some alternative embodiments, the top wall of the return air hood is flush with the top surface of the air outlet plate.

[0007] In some alternative embodiments, the return air shroud is made of stainless steel.

[0008] In some alternative embodiments, the hot air box has a trapezoidal cross-section.

[0009] Secondly, embodiments of this application provide a hot air drying device for coated paper. The hot air drying device includes a first drying unit and a second drying unit. The first drying unit includes a first hot air box, a first air outlet plate, a first return air plate, and a first return air hood. The first air outlet plate is connected to the first hot air box and has a first air outlet hole, through which the hot air in the first hot air box can be blown out. The first return air plate is disposed adjacent to the first air outlet plate and has a first return air channel inside. The surface of the first return air plate has a first return air hole, which communicates with the first return air channel. The airflow cooled by the coated paper enters the first return air channel through the first return air hole. The first return air hood covers the surface of the first return air plate and is disposed corresponding to the first return air hole.

[0010] The second drying unit is disposed opposite to the first drying unit. The second drying unit includes a second hot air box, a second air outlet plate, a second return air plate, and a second return air hood. The second air outlet plate is connected to the second hot air box and has a second air outlet hole, through which the hot air in the second hot air box can be blown out. The second return air plate is disposed adjacent to the second air outlet plate and has a second return air channel inside. The surface of the second return air plate has a second return air hole, which communicates with the second return air channel. The airflow cooled by the coated paper enters the second return air channel through the second return air hole. The second return air hood covers the surface of the second return air plate and is disposed corresponding to the second return air hole.

[0011] The coated paper to be dried is located between the air outlet of the second drying unit and the first drying unit.

[0012] In some optional embodiments, there are multiple first air outlet plates arranged in parallel at intervals, and multiple first return air plates arranged alternately with the first air outlet plates; there are multiple second air outlet plates arranged in parallel at intervals, and multiple second return air plates arranged alternately with the second air outlet plates.

[0013] In some optional embodiments, the first return air hood has an n-shaped cross-section, including a first top wall and a first side wall and a second side wall integrally extended from both sides of the first top wall, and the first top wall is provided with a first ventilation hole; the second return air hood has an n-shaped cross-section, including a second top wall and a third side wall and a fourth side wall integrally extended from both sides of the second top wall, and the second top wall is provided with a second ventilation hole.

[0014] In some optional embodiments, the first top wall of the first return air hood is flush with the top surface of the first air outlet plate; the second top wall of the second return air hood is flush with the top surface of the second air outlet plate; both the first return air hood and the second return air hood are made of stainless steel.

[0015] The hot air drying equipment for coated paper provided in this application has the characteristics of simple structure, easy cleaning of paper scraps, and low overall maintenance cost. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments 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 these drawings without creative effort.

[0017] Figure 1 This is a top view schematic diagram of an embodiment of the hot air drying equipment for coated paper of this application;

[0018] Figure 2 yes Figure 1 A schematic cross-sectional view of the hot air drying equipment along line AA in the embodiment;

[0019] Figure 3 yes Figure 2 A magnified view of the local structure at point B in the embodiment;

[0020] Figure 4 This is a schematic diagram of the structure of one embodiment of the return air hood of this application;

[0021] Figure 5 This is a schematic diagram of another embodiment of the hot air drying equipment for coated paper in this application. Detailed Implementation

[0022] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be particularly noted that the following embodiments are for illustrative purposes only and do not limit the scope of the application. Similarly, the following embodiments are only some, not all, embodiments of the present application, and all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present application.

[0023] The terms "first," "second," and "third" used in the embodiments of this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationships and movement of components in a specific posture (as shown in the figures). If the specific posture changes, the directional indication will also change accordingly. The terms "comprising" and "having," and any variations thereof, in the embodiments of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or components inherent to these processes, methods, products, or devices.

[0024] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0025] This embodiment provides a hot air drying device for coated paper; please refer to it as well. Figures 1 to 3 , Figure 1 This is a top view schematic diagram of an embodiment of the hot air drying equipment for coated paper according to this application. Figure 2 yes Figure 1 A schematic cross-sectional view of the hot air drying equipment along line AA in the embodiment; Figure 3 yes Figure 2 The enlarged schematic diagram of the partial structure at point B in the embodiment shows that the hot air drying equipment in this embodiment includes a hot air box 100, an air outlet plate 200, a return air plate 300, and a return air hood 400.

[0026] Specifically, the air outlet plate 200 is connected to the hot air box 100. The air outlet plate 200 protrudes from the surface of the hot air box 100 and can be welded to the hot air box 100 or the two can be an integral structure. The air outlet plate 200 is provided with an air outlet hole 201, and the hot air in the hot air box 100 can be blown out through the air outlet hole 201. Optionally, in this embodiment, the hot air box 100 has a trapezoidal cross-section. The hot air enters the hot air box 100 from the large end of the trapezoidal structure (in the direction of the arrow in the figure) and is then dispersed and evenly blown out through the air outlet hole 201 on the air outlet plate 200.

[0027] The return air plate 300 and the air outlet plate 200 are arranged adjacent to each other. The return air plate 300 is provided with a return air channel 310 and the surface of the return air plate 300 is provided with a return air hole 301. The return air hole 301 is connected to the return air channel 310. The coated paper 88 to be dried is suspended above the air outlet plate 200 due to the hot air blowing out. The airflow after the coated paper is cooled enters the return air channel 310 through the return air hole 301 to complete the airflow circulation.

[0028] In actual operation, if a paper breakage occurs, the small pieces of torn paper are easily stuck in the return air groove 203 of the adjacent air outlet plate 200. This sticking prolongs the total time required for the paper machine to rewind the paper, thus affecting production efficiency. Cleaning the paper stuck in the return air groove 203 requires additional time and labor, increasing maintenance costs and reducing production efficiency. Furthermore, in traditional air-cushion hot air box designs, direct contact between the paper and the hot air box can lead to unstable air cushion support, affecting the quality and consistency of the coated paper and potentially causing bubbling, deformation, or damage.

[0029] In this embodiment, the return air cover 400 is installed on the surface of the return air plate 300 and is provided corresponding to the return air hole 301. The function of the return air cover 400 is to cover the groove where the return air plate 300 is located, to prevent paper scraps from being left in the groove, which is inconvenient to clean and easily blocks the return air hole 301.

[0030] Alternatively, please continue reading Figure 1 and Figure 2 In this embodiment, there are multiple air outlet plates 200 arranged in parallel with intervals, and there are also multiple return air plates 300, which are arranged alternately with the air outlet plates 200.

[0031] Please see Figure 4 , Figure 4 This is a structural schematic diagram of an embodiment of the return air hood of this application. The return air hood 400 in this embodiment has an n-shaped cross-section, including a top wall 410 and a first side wall 420 and a second side wall 430 integrally extended from both sides of the top wall 410. The top wall 410 is provided with ventilation holes 401.

[0032] The return air hood can be made of stainless steel. The return air hood 400 can be fixedly connected to the air outlet plate 200 via a first side wall 420 and a second side wall 430, specifically through welding or screw connection, etc., without specific limitations. Optionally, in this embodiment, the top wall 410 of the return air hood 400 is flush with the top surface 202 of the air outlet plate 200. This provides better support for the coated paper 88, ensuring the air cushion support effect and improving the quality and consistency of the coated paper.

[0033] Please see Figure 5 , Figure 5 This is a schematic diagram of another embodiment of the hot air drying equipment for coated paper according to this application. The hot air drying equipment in this embodiment includes a first drying unit 10 and a second drying unit 20, wherein the first drying unit 10 and the second drying unit 20 are arranged symmetrically vertically. The coated paper 88 to be dried is located between the air outlets of the second drying unit 20 and the first drying unit 10.

[0034] Specifically, the first drying unit 10 includes a first hot air box 10a, a first air outlet plate 10b, a first return air plate 10c, and a first return air hood 10d; the first air outlet plate 10b is connected to the first hot air box 10a, and the first air outlet plate 10b is provided with a first air outlet hole, through which the hot air in the first hot air box 10a can be blown out; the first return air plate 10c is arranged adjacent to the first air outlet plate 10b, and the first return air plate 10c is provided with a first return air channel, and the surface of the first return air plate 10c is provided with a first return air hole, which communicates with the first return air channel, through which the airflow cooled by the coated paper 88 enters the first return air channel; the first return air hood 10d is covered on the surface of the first return air plate 10c and is provided corresponding to the first return air hole.

[0035] The second drying unit 20 is disposed opposite to the first drying unit 10. The second drying unit 20 includes a second hot air box 20a, a second air outlet plate 20b, a second return air plate 20c, and a second return air hood 20d. The second air outlet plate 20b is connected to the second hot air box 20a and has a second air outlet hole. The hot air in the second hot air box 20a can be blown out through the second air outlet hole. The second return air plate 20c is disposed adjacent to the second air outlet plate 20b and has a second return air channel. The surface of the second return air plate 20c has a second return air hole, which is connected to the second return air channel. The airflow cooled by the coated paper 88 enters the second return air channel through the second return air hole. The second return air hood 20d is disposed on the surface of the second return air plate 20c and is disposed corresponding to the second return air hole.

[0036] The cross-sections of both the second hot air box 20a and the first hot air box 10a can be trapezoidal. Multiple first air outlet plates 10b are arranged in parallel with intervals in sequence; multiple first return air plates 10c are arranged alternately with the first air outlet plates 10b; multiple second air outlet plates 20b are arranged in parallel with intervals in sequence; multiple second return air plates 20c are arranged alternately with the second air outlet plates 20b.

[0037] The first return air hood 10d has an n-shaped cross-section, including a first top wall and a first side wall and a second side wall integrally extended from both sides of the first top wall. The first top wall is provided with a first ventilation hole. The second return air hood 20d has an n-shaped cross-section, including a second top wall and a third side wall and a fourth side wall integrally extended from both sides of the second top wall. The second top wall is provided with a second ventilation hole.

[0038] The first top wall of the first return air hood 10d is flush with the top surface of the first air outlet plate 10b; the second top wall of the second return air hood 20d is flush with the top surface of the second air outlet plate 20b; both the first return air hood 10d and the second return air hood 20d are made of stainless steel. For other detailed structures of the second drying unit 20 and the first drying unit 10, please refer to the relevant descriptions in the foregoing embodiments, which will not be repeated here.

[0039] The hot air drying equipment for coated paper in this embodiment improves drying efficiency by setting up two symmetrical drying units. The hot air drying equipment for coated paper provided in this application embodiment features a simple structure, easy cleaning of paper scraps, and low overall maintenance costs.

[0040] The above description is only a part of the embodiments of this application and does not limit the scope of protection of this application. Any equivalent device or equivalent process transformation made based on the content of this application specification and drawings, or direct or indirect application in other related technical fields, are similarly included in the patent protection scope of this application.

Claims

1. A hot air drying device for coated paper, characterized in that, The hot air drying equipment includes a hot air box, an air outlet plate, a return air plate, and a return air hood. The air outlet plate is connected to the hot air box and has air outlet holes, through which the hot air flow in the hot air box can be blown out. The return air plate is arranged adjacent to the air outlet plate and has a return air channel inside. The surface of the return air plate has return air holes that communicate with the return air channel, through which the air flow cooled by the coated paper enters the return air channel. The return air hood covers the surface of the return air plate and is arranged corresponding to the return air holes.

2. The hot air drying equipment according to claim 1, characterized in that, The air outlet plates are multiple and arranged in parallel with intervals in sequence. The return air plates are multiple and are arranged alternately with the air outlet plates.

3. The hot air drying equipment according to claim 1, characterized in that, The return air hood has an n-shaped cross-section, including a top wall and a first side wall and a second side wall that extend integrally with both sides of the top wall. The top wall is provided with ventilation holes.

4. The hot air drying equipment according to claim 3, characterized in that, The top wall of the return air hood is flush with the top surface of the air outlet plate.

5. The hot air drying equipment according to claim 3, characterized in that, The return air hood is made of stainless steel.

6. The hot air drying equipment according to claim 1, characterized in that, The hot air box has a trapezoidal cross-section.

7. A hot air drying device for coated paper, characterized in that, The hot air drying equipment includes a first drying unit and a second drying unit. The first drying unit includes a first hot air box, a first air outlet plate, a first return air plate, and a first return air hood. The first air outlet plate is connected to the first hot air box and has a first air outlet hole, through which the hot air in the first hot air box can be blown out. The first return air plate is arranged adjacent to the first air outlet plate and has a first return air channel inside. The surface of the first return air plate has a first return air hole, which communicates with the first return air channel. The airflow cooled by the coated paper enters the first return air channel through the first return air hole. The first return air hood covers the surface of the first return air plate and is arranged corresponding to the first return air hole. The second drying unit is disposed opposite to the first drying unit. The second drying unit includes a second hot air box, a second air outlet plate, a second return air plate, and a second return air hood. The second air outlet plate is connected to the second hot air box and has a second air outlet hole, through which the hot air in the second hot air box can be blown out. The second return air plate is disposed adjacent to the second air outlet plate and has a second return air channel inside. The surface of the second return air plate has a second return air hole, which communicates with the second return air channel. The airflow cooled by the coated paper enters the second return air channel through the second return air hole. The second return air hood covers the surface of the second return air plate and is disposed corresponding to the second return air hole. The coated paper to be dried is located between the air outlet of the second drying unit and the first drying unit.

8. The hot air drying equipment according to claim 7, characterized in that, The first air outlet plate consists of multiple plates arranged in parallel at intervals, and the first return air plate consists of multiple plates arranged alternately with the first air outlet plate; the second air outlet plate consists of multiple plates arranged in parallel at intervals, and the second return air plate consists of multiple plates arranged alternately with the second air outlet plate.

9. The hot air drying equipment according to claim 7, characterized in that, The first return air hood has an n-shaped cross-section, including a first top wall and a first side wall and a second side wall integrally extended from both sides of the first top wall. The first top wall is provided with a first ventilation hole. The second return air hood has an n-shaped cross-section, including a second top wall and a third side wall and a fourth side wall integrally extended from both sides of the second top wall. The second top wall is provided with a second ventilation hole.

10. The hot air drying equipment according to claim 9, characterized in that, The first top wall of the first return air hood is flush with the top surface of the first air outlet plate; the second top wall of the second return air hood is flush with the top surface of the second air outlet plate; both the first and second return air hoods are made of stainless steel.

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