Air treatment unit and method for manufacturing such air treatment unit

Abstract

This disclosure discloses an air treatment unit (100) comprising an adsorption medium (20). The adsorption medium (20) has a first side (21), a second side (22) opposite to the first side (21), and at least one peripheral side (23), and the adsorption medium (20) has corrugated panels (24) that form a channel (25) extending through the adsorption medium (20) from the first side (21) to the second side (22), and the air treatment unit (100) is characterized by comprising at least one section (26) of the adsorption medium having a solid powder coating (30) on at least one of the first side (21) and the second side (22).

Description

Technical Field

[0001] The present invention relates to an air treatment unit and a method for manufacturing such an air treatment unit. Specifically, the present invention relates to an air treatment unit defined in the appended claims and a method for manufacturing such an air treatment unit.

Background Art

[0002] In the technical field of air treatment, various types of air treatment units equipped with an adsorption medium for adsorbing or absorbing a gas are used. Such an air treatment unit can be, for example, a desiccant rotor in which an adsorption medium, also called a rotor medium, is configured to absorb moisture. The adsorption medium typically comprises a corrugated panel that forms channels extending through the adsorption medium. The adsorption medium can have a brittle surface and a high level of material porosity. It is necessary to address this vulnerability, and currently, it is addressed by using a liquid paint coating for reinforcing the material surface. With an appropriate surface coating, the adsorption medium surface becomes stronger, its frictional resistance decreases, and its wear resistance improves.

[0003] A general coating process for an air treatment unit is based on spraying technology with a liquid paint. The paint is applied to the adsorption medium surface via a nozzle or a spray gun. This process is often manually performed by an operator. Such coating technology has a strong tendency to clog and / or penetrate into the channel openings of the adsorption medium. Since the paint thus blocks the pores of the adsorption medium, moisture may not enter the adsorption medium, and the dehumidification capacity of the air treatment unit may decrease. Also, in such coating technology, the paint may be used excessively, resulting in a high paint cost. Furthermore, the working environment when using the spraying technology of a liquid paint is harsh and has an adverse impact on environmental sustainability.

Summary of the Invention

[0004] The object of the present invention is to mitigate, reduce, or eliminate one or more defects and shortcomings of the prior art, and to solve at least the above-mentioned problems.

[0005] Therefore, the object of the present invention is to realize an air treatment unit and a method for manufacturing such an air treatment unit that ensure the functionality of the air treatment unit while resulting in a strong and wear-resistant surface for the adsorption medium of the air treatment unit.

[0006] Another objective of the present invention is to provide an air treatment unit and a method for manufacturing such an air treatment unit that improves the working environment and reduces manufacturing costs.

[0007] According to a first aspect of the present disclosure, an air treatment unit is provided comprising an adsorption medium, the adsorption medium comprising a first side, a second side opposite to the first side, and at least one peripheral side, the adsorption medium comprising corrugated panels forming channels extending through the adsorption medium from the first side to the second side, and the air treatment unit comprising at least one section of the adsorption medium having a solid powder coating on at least one of the first side and the second side.

[0008] Today, liquid paint coatings or paints applied by spraying or immersion are commonly used to cover the adsorption media of air treatment units. Common problems with these coatings are that the adsorption media absorbs the paint due to its porosity (also known as wicking), and that it is difficult to align and distribute a uniform coating layer on the adsorption media. When the adsorption media absorbs the paint, there is a risk that fibers will stand up, resulting in a rough and uneven surface. Such fiber standing up can increase friction and affect the sealing performance, especially if the air treatment unit is a rotor. Powder coating or powder paint is a paint that is applied as a dry powder and then cured by heat to form a solid coating on the object to be coated. By using the powder coating according to this disclosure, a homogeneous coating that is uniformly distributed on the adsorption media can be achieved. Powder coating is easier to apply to the adsorption media in a uniform and predictable manner, and because it does not contain liquid, it reduces the risk of the adsorption media absorbing the coating. Therefore, using powder coating can reduce or eliminate the risk of fibers standing up and clogging the pores of the adsorbent medium, thereby reducing the risk of increased surface roughness, increased friction, and pressure drop. Using powder coating on the adsorbent medium strengthens the surface, making it smoother, more robust, and improving wear resistance.

[0009] The adsorption medium may be called a rotor medium or honeycomb medium, and the channels formed by the corrugated panels may be called flutes. The adsorption medium may consist of a corrugated glass fiber structure containing a hygroscopic desiccant such as silica gel, lithium chloride, or hydrophobic zeolite adsorbent. The first and second sides of the adsorption medium may be called the air inlet side and the air outlet side.

[0010] Powder coatings can be single-layer polyester powder coatings, polyurethane and / or polyester powder paints. Such coatings are inherently smooth and are particularly suitable for temperature-sensitive materials such as adsorbent media. Powder coatings can be any polymer powder paint.

[0011] For example, at least one section of the adsorption medium is provided with a powder coating on at least one peripheral edge. Having a powder coating on at least one peripheral edge improves the smoothness and strength of the peripheral edge of the adsorption medium.

[0012] The air processing unit may be a gas adsorption rotor for dehumidification, with at least one peripheral side being a circumferential side extending essentially perpendicular to the radial extension of the rotor. The gas adsorption rotor may consist of two or more rotor sections assembled to form a complete annular rotor. Alternatively, the gas adsorption rotor may consist of one annular rotor section. The first and second sides of the adsorption medium correspond to the first and second sides of the gas adsorption rotor. The axial extension of the gas adsorption rotor extends between the first and second sides. The surfaces of the first and second sides of the rotor are essentially flat. The circumferential side of the rotor extends around the circumference of the rotor. The surface of the circumferential side is curved. It should be understood that a rotor section may have multiple peripheral sides, one peripheral side forming part of the circumferential side of the assembled gas adsorption rotor. The other peripheral sides of the rotor section face the peripheral sides of other rotor sections when assembled. The gas adsorption rotor may include partition plates positioned between the peripheral sides of different rotor sections. Therefore, the peripheral edge of the rotor section can come into contact with the partition plate.

[0013] Alternatively, the air handling unit is a pad for evaporative cooling, with at least one peripheral side extending essentially perpendicular to the first and second sides. The adsorbent medium of the pad may have four peripheral sides, all extending essentially perpendicular to the first and second sides of the adsorbent medium. Thus, the adsorbent medium of the evaporation pad may have essentially a rectangular cubic shape.

[0014] The powder coating can extend approximately 1 to 4 millimeters into the channels of the adsorption medium. Therefore, the powder coating can be applied so as to cover the surface of the adsorption medium and extend into the channels. In this way, the powder coating can extend 1 to 4 millimeters into the channels from the openings. By limiting the extent to which the coating is applied into the channels, the coating will not adversely affect the functionality of the air treatment unit. In this way, by limiting the extent to which the inside of the channels is covered by the coating, the dehumidification, adsorption, and / or absorption capacity of the air treatment unit will not adversely affect.

[0015] For example, solid powder coatings are transparent. Currently used colored coatings can clog some of the channels, affecting the functionality of air treatment units. Furthermore, pigments have a negative impact on the environment. Therefore, removing colored pigments from the coating improves the functionality of air treatment units, provides a more sustainable solution, and reduces costs.

[0016] The air treatment unit may further include markings on at least a portion of at least one surface of the adsorbent medium, which are created by laser or heat stamping. Currently, the manufacturing process for air treatment units using adsorbent medium typically involves spraying a coating onto the adsorbent medium. The coating is applied for the purpose of hardening the surface of the adsorbent medium, but usually also includes a colored pigment for identification. Thus, the coating is often a colored coating where a specific color corresponds to a specific adsorbent medium configuration. Air treatment units can be constructed in various ways depending on the application in which they are used. The corrugated (flute or channel) dimensions of the adsorbent medium vary as well as the material treatment of the adsorbent medium. Thus, the adsorbent medium configuration of the air treatment unit may be related to the channel dimensions and / or material treatment of the adsorbent medium. The specific adsorbent medium configuration needs to be identified at the user facility, both during the manufacturing process and during the assembly of the air treatment unit, to know which adsorbent medium sections should be installed where. Furthermore, if the air treatment unit has an identification marking of the adsorbent medium configuration, service and maintenance will be easier. By marking at least a portion of at least one surface of the adsorption medium using a laser or heat stamp, the composition of the adsorption medium can be identified, thereby eliminating the need for coloring pigments in the coating.

[0017] Marking can be achieved by treating the surface at high temperatures and by removing fine layers of the material. Marking may also include lightly burning the top surface of the adsorbent medium with a fine, programmable laser beam. General techniques of laser marking or laser engraving are considered to be known and will not be discussed in detail herein. Surface defects can be removed by laser marking or heat stamping at least a portion of the surface of the adsorbent medium, resulting in a smoother surface. Smooth means that the surface is free from visible protrusions, lumps, or depressions. A smoother surface improves sealing and reduces friction. Marking may be configured to enable identification of the adsorbent medium. Marking may be a pattern, code, or any other graphic marking suitable for recognizing, identifying, or tracking the adsorbent medium, and by extension, the air handling unit containing the adsorbent medium. Marking may be configured to enable optical identification of the adsorbent medium. For this purpose, marking may include QR codes, barcodes, or similar. In this way, marking may indirectly include information about the manufacturing batch of the adsorbent medium or any other information related to the adsorbent medium. This could be advantageous, for example, in terms of traceability.

[0018] A second aspect of the present invention provides a method for manufacturing an air treatment unit disclosed herein. The method includes the steps of applying a coating powder to at least one of the first and second sides of at least one section of an adsorption medium, and curing the coating powder to create a solid powder coating. Curing may be performed by a heat source that heats the applied powder to a temperature of 150 to 300°C, preferably 180 to 230°C. The heat source may be an infrared lamp, an ultraviolet lamp, or a heat gun. When the powder is cured, it forms a solid film or coating layer. The step of curing the coating powder may include adjusting the thermal intensity of the heat source, the angle of the heat (beam) relative to the surface of the adsorption medium to which the coating powder is applied, and / or the distance between the heat source and the surface of the adsorption medium. It should be understood that the features and advantages described above for the air treatment unit are also applicable to such a method for manufacturing air treatment.

[0019] The step of applying the coating powder may include applying static electricity to the adsorption medium or grounding the adsorption medium, and then spraying the coating powder onto the adsorption medium with an electrostatic spraying device. Thus, the coating powder can be applied by an electrostatic powder coating process, and the electrostatic spraying device may be an electrostatic spray gun or a corona gun. Because the powder particles are charged, they repel each other and diffuse when discharged from the electrostatic spraying device. The adsorption medium is charged in the opposite direction to the powder particles or is grounded. In this way, the Faraday cage effect is obtained, the powder is attracted to the adsorption medium, resulting in a more uniform coating than wet spray coating, and the powder adheres to the adsorption medium in a controlled manner. In general, due to the so-called Faraday cage effect, the electrostatic field tends to concentrate at the edges of the channels in the adsorption medium, and also at the surface of the adsorption medium due to the electrical resistance generated by the channels. Since the electric force always follows the path of least resistance, the powder follows the electric field lines and accumulates at the edges of the channels, reducing the amount of powder flowing into the channels. Increasing the voltage strengthens the electric field, making it easier for powder particles to remain within the electric field and less likely to penetrate the channels of the adsorption medium. Thus, using electrostatic coating reduces the risk of clogging of the adsorption medium's channels and does not affect the functionality of the adsorption medium. This process allows for precise control of the coating thickness and distribution. It should be understood that various coating methods are available for powder coating, including electrostatic spray guns and methods based on counter electrodes and / or grounding connected to the adsorption medium. While the adsorption medium is not as conductive as a metal, it is conductive enough to attract charged powder particles. This increases the likelihood of the coating adhering to the adsorption medium compared to spraying a liquid coating, which is likely to be applied to surrounding objects as well.

[0020] The step of curing the coating powder may include controlling how deep the curing occurs within the channels of the adsorbent medium. Only the heated and thereby cured coating powder becomes a solid coating layer or film covering the inner walls of the channels of the adsorbent medium. Thus, by controlling how deep the curing occurs within the channels of the adsorbent medium, the extent to which the coating is applied within the channels is controlled. This can be done by controlling the angle of the heat supplied by the heat source to the first and / or second side surfaces of the adsorbent medium, and / or adjusting the distance between the heat source and the surface of the adsorbent medium, and / or adjusting the intensity of the heat source. In this way, controlling the curing determines how much of the coating covers the inner walls of the channels, and thereby determines how much the coating affects the functionality of the adsorbent medium. The step of curing the coating powder may include controlling the curing so that the solid powder coating can extend 1 to 4 millimeters within the channels of the adsorbent medium. Therefore, curing should occur 1 to 4 millimeters within the channels, as well as on the outer surface of the adsorbent medium. This is achieved by applying heat at an angle of 30 to 90 degrees to the surface of the adsorbent medium. Alternatively, this can also be achieved by applying heat at a distance of 20 to 40 centimeters from the surface of the adsorbent medium. However, it should be understood that the appropriate distance between the heat source and the adsorbent medium depends on the intensity of the heat source.

[0021] In one example, the method further includes blowing out the coating powder of a loose fitting from the channel. After the coating powder has cured, any uncured coating powder inside the channel can be blown out of the channel. This allows the uncured powder to be recycled and reused. This reduces waste compared to spraying paint and lowers the cost of coating the adsorbent medium. During the powder application step, the powder is subsequently removed and does not affect the functionality of the adsorbent medium, so it is not necessary to completely prevent powder from entering the channel, and manufacturing is also easier.

[0022] The method may also include blowing compressed air into the adsorption medium before applying the coating powder. Blowing air into the adsorption medium ensures that there are no contaminants or other external particles on the adsorption medium that could affect the smoothness of the applied coating.

[0023] The step of applying the coating powder may also include applying the coating powder to at least one peripheral side of at least one section of the adsorption medium.

[0024] The method may further include curing the solid powder coating in a convection oven. After curing the coating powder and optionally blowing away any residual powder in the channels, an adsorption medium may be placed in the convection oven to further harden the coating and improve its smoothness.

[0025] In one example, the method includes marking at least a portion of at least one surface of an adsorbent medium by laser or heat stamping. This is preferably done before applying the coating powder. The step of marking at least one surface may be an iterative process in which the entire surface is first laser-marked with a first relatively low intensity and / or power to smooth the surface, and then a mark is created by marking a specific portion of the surface with a second increased intensity and / or power. Alternatively, the marking may be performed in a single step, alternating between different intensities and / or powers.

[0026] The methods described herein can be automated and therefore carried out by robots. In this way, the manufacture of air treatment units can be highly time-efficient and cost-efficient.

[0027] The above-mentioned objectives of the present invention, as well as additional objectives, features, and advantages, will be better understood by referring to the following exemplary and non-limiting detailed description of exemplary embodiments of the present disclosure in conjunction with the accompanying drawings. [Brief explanation of the drawing]

[0028] [Figure 1a-1b] This is a diagram schematically showing an air treatment unit according to an example of the present invention. [Figure 2a-2b] This is a diagram schematically showing an air treatment unit according to an example of the present invention. [Figure 3] This is a diagram schematically showing an air treatment unit according to an example of the present invention. [Figure 4] This is a diagram schematically showing a manufacturing method of an air treatment unit according to the present invention. [Figure 5] This is a diagram schematically showing an example in which a powder coating is cured on an adsorption medium.

Embodiments for Carrying out the Invention

[0029] The present invention will become apparent from the following detailed description. The detailed description and specific examples are for the purpose of illustration only and disclose preferred embodiments of the present disclosure. Those skilled in the art will understand that changes and modifications can be made within the scope of the present disclosure based on the guidance of the detailed description.

[0030] Therefore, it should be understood that the invention disclosed in this specification is not limited to the specific components of the described devices or the specific steps of the described methods, and these devices and methods can be various. It should also be understood that the terms used in this specification are used only for the purpose of describing specific embodiments and are not intended to be limiting. Also, note that the articles "a", "an", "the" and "said" used in the specification and the appended claims are intended to mean that there is one or more elements unless explicitly stated otherwise in the context. Also, "comprising", "including", "containing" and similar phrases do not indicate an intention to exclude other elements or steps.

[0031] Figures 1a and 1b schematically show an air treatment unit 100 according to an example of the present invention. Figure 1a is a side view of the air treatment unit 100. The air treatment unit 100 comprises an adsorption medium 20 having a first side 21, a second side 22 opposite the first side 21, and at least one peripheral side 23. The adsorption medium 20 typically comprises a corrugated glass fiber structure containing a hygroscopic desiccant such as silica gel, lithium chloride, or hydrophobic zeolite adsorbent. The adsorption medium 20 comprises a channel 25 (see Figure 1b) extending between the first side 21 and the second side 22. Thus, the openings of the channel 25 are typically located on the first side 21 and the second side 22 of the adsorption medium 20.

[0032] The air treatment unit 100 further comprises at least one section 26 of an adsorption medium having a solid powder coating 30 on at least one of its first side 21 and second side 22. The powder coating 30 may be transparent or contain a colored pigment. At least one section 26 of the adsorption medium may also have a solid powder coating 30 on at least one peripheral side 23. The powder coating 30 can cover about 1 to 4 millimeters of the inner wall of the channel 25 of the adsorption medium 20. Thus, the powder coating 30 can cover the surface of the adsorption medium 20 and penetrate about 1 to 4 millimeters into the channel 25.

[0033] Figure 1b shows an enlarged view of the adsorption medium 20 of the air treatment unit 100. This figure shows the channels 25 of the rotor medium 20, which is formed by stacking corrugated panels 24 on top of each other. The adsorption medium 20 has different configurations depending on the application in which it is used. The dimensions of the channels or flutes are one of the differences between different adsorption media 20.

[0034] Figures 2a and 2b schematically show an air treatment unit 100 according to an example of the present invention. The air treatment unit 100 can be configured as disclosed in Figures 1a and 1b. In Figure 2a, the air treatment unit 100 is a gas adsorption rotor. The gas adsorption rotor 100 has a first side 21, a second opposing side 22, and at least one peripheral side 23. In this example, the peripheral side 23 is a circumferential side that extends essentially perpendicular to the radial extension of the rotor 100. Gas adsorption rotors are well known in the art and typically include at least one regeneration section 11 and one process section 13, as shown in this figure. Furthermore, the gas adsorption rotor 100 may include a purge section (not shown). Although only one regeneration section is shown in Figure 2a, the disclosure is also applicable to rotors having multiple regeneration sections and / or divided regeneration sections. Furthermore, the disclosure is also applicable to rotors having separate purge zones and / or other rotor divisions. Arrows P and R in Figure 2a represent the flow of process air through process section 13 and the flow of regenerated air through regeneration section 11, respectively.

[0035] The channels 25 of the adsorption medium 20 may extend parallel to the rotation axis A of the gas adsorption rotor 100. Alternatively, the channels 25 may extend radially and / or axially and / or in any direction through the adsorption medium 20 of the gas adsorption rotor 100.

[0036] The gas adsorption rotor 100 comprises at least one section 26 of an adsorption medium having a solid powder coating 30 on a first side 21 and / or a second side 22. Typically, the entire surface of the adsorption medium is coated with the solid powder coating 30 on the first side 21 and / or the second side 22.

[0037] In Figure 2b, the air processing unit 100 is an evaporation pad for evaporative cooling. The adsorption medium 20 of the evaporation pad 100 has a first side 21, a second opposing side 22, and at least one peripheral side 23. In this example, at least one peripheral side 23 extends essentially perpendicular to the first side 21 and the second side 22 of the adsorption medium 20. Specifically, the adsorption medium 20 has four peripheral sides 23.

[0038] Figure 3 schematically shows an air treatment unit 100 according to an example of the present invention. The air treatment unit 100 can be configured as disclosed in Figures 1a to 1b or Figures 2a to 2b. In this example, at least one section 26 of the adsorption medium is provided with a marking 40. The marking 40 is created by laser or heat stamping. The marking 40 may be configured to identify the adsorption medium configuration of the air treatment unit 100. In this example, the entire surface of the first side 21 and second side 22 of the adsorption medium 20 is marked, and the marking 40 has a bright honeycomb pattern on a dark background. Thus, the marking 40 corresponds to a specific adsorption medium configuration of the air treatment unit 100, and the adsorption medium configuration may relate to the material treatment and / or channel dimensions of the adsorption medium 20. The dark areas are achieved using higher intensity and / or power. The air treatment unit 100 is provided with a powder coating 30 applied to the marking 40.

[0039] Figure 4 schematically shows a method for manufacturing an air treatment unit 100 according to the present invention. The method is used to manufacture an air treatment unit 100 as disclosed in any of Figures 1 to 3. The method includes the steps of: applying a coating powder to at least one of the first side 21 and the second side 22 of at least one section 26 of an adsorption medium (step s101); and curing the coating powder to create a solid powder coating 30 (step s102). Curing (cure) s102 may be performed using a heat source that heats the applied powder to a temperature of 150 to 300°C. The heat source may be an infrared lamp, an ultraviolet lamp, or a heat gun. When the powder is cured, it forms a solid film or layer of coating 30.

[0040] Step s101 of applying the coating powder may include electrostatically charging the adsorption medium 20 or grounding the adsorption medium 20, and then spraying the coating powder onto the adsorption medium 20 using an electrostatic spraying device. Therefore, step s101 of applying the coating powder usually involves charging the powder particles so that they repel each other. The adsorption medium 20 is charged in the opposite direction to the powder particles or is grounded. This produces a Faraday cage effect, and the powder is attracted to the adsorption medium 20. Therefore, step s101 of applying the coating powder may involve producing a Faraday cage effect. Increasing the voltage strengthens the electric field, causing the powder particles to remain in the electric field and making it difficult for them to penetrate the adsorption medium channel 25.

[0041] Step s102, which involves curing the coating powder, may include controlling how deep the curing occurs within the channels 25 of the adsorption medium 20. How this can be achieved will be further explained with reference to Figure 5.

[0042] The method optionally includes step s103 of blowing out the coating powder of the loose fitting from the channel 25 of the adsorption medium 20. After step s102 of curing the coating powder, the uncured coating powder that is still in the channel 25 can be blown out of the channel 25. In this way, the uncured powder can be recycled and reused.

[0043] The method may also include blowing compressed air into the adsorption medium 20 s104 before applying the coating powder s101. Blowing air into the adsorption medium 20 ensures that there are no contaminants or other external particles on the adsorption medium that could affect the smoothness of the applied coating.

[0044] Step s101 of applying the coating powder may include applying the coating powder to at least one peripheral side 23 of at least one section 26 of the adsorption medium.

[0045] The method may further include hardening the solid powder coating 30 in a convection oven s105. After curing the coating powder s102 and optionally blowing away any residual powder in the channel 25 s103, the adsorption medium 20 may be placed in the convection oven to further harden the coating 30 and improve the smoothness of the coating 30.

[0046] Optionally, the method includes marking at least a portion of at least one surface of the adsorption medium 20 by laser or heat stamping s106. This is preferably done before applying the coating powder s101. Thus, the marking 40 may be provided under the solid powder coating 30.

[0047] Figure 5 shows section 26 of the adsorbent medium in curing method step s102 as described with respect to Figure 4. As previously stated, step s102, which cures the coating powder applied to the adsorbent medium 20, may include controlling how far the curing occurs within the channels 25 of the adsorbent medium 20. The curing is performed by a heat source 200. Controlling how far the curing occurs within the channels 25 can be done by controlling the angle α of the heat supplied from the heat source 200 with respect to the surface of the adsorbent medium 20, and / or adjusting the distance D between the heat source 200 and the surface of the adsorbent medium 20, and / or adjusting the intensity of the heat source 200. The figure shows the heat as large arrows supplied at three different angles α with respect to the surface of the adsorbent medium. From left to right in the figure, the angles α are 90 degrees, 80 degrees, and 40 degrees. As an example, the angle α is in the range of 30 to 90 degrees. The distance D between the heat source 200 and the adsorbent medium 20 may be 20 to 40 centimeters, but depends on the thermal intensity of the heat source 200.

[0048] Please note that the examples shown in the drawings are for illustrative purposes only, and many other alternative examples are possible within the scope of the present invention.

Claims

1. An air treatment unit (100) equipped with an adsorption medium (20), The adsorption medium (20) has a first side (21), a second side (22) facing the first side (21), and at least one peripheral side (23), The adsorption medium (20) has a corrugated panel (24) that forms a channel (25) extending through the adsorption medium (20) from the first side (21) to the second side (22), The air treatment unit (100) is characterized in that it comprises at least one section (26) of an adsorption medium having a solid powder coating (30) on at least one of the first side (21) and the second side (22).

2. The air treatment unit (100) according to claim 1, wherein the powder coating (30) is a single-layer polyester coating, polyurethane and / or polyester powder paint.

3. The air treatment unit (100) according to claim 1 or 2, wherein at least one section (26) of the adsorption medium is provided with a powder coating (30) on at least one peripheral side (23).

4. The air treatment unit (100) according to any one of claims 1 to 3, wherein the powder coating (30) extends to about 1 to 4 millimeters within the channel (25) of the adsorption medium (20).

5. The air treatment unit (100) according to any one of claims 1 to 4, wherein the solid powder coating (30) is transparent.

6. The adsorption medium (20) is further provided with markings (40) on at least a portion of its surface, The air treatment unit (100) according to any one of claims 1 to 5, wherein the marking (40) is created by a laser or heat stamp.

7. The air treatment unit (100) according to claim 6, wherein the marking (40) is provided beneath the solid powder coating (30).

8. The solid powder coating (30) is transparent, The air treatment unit (100) further has markings (40) on at least a portion of the surface of the adsorption medium (20), The air treatment unit (100) according to claim 1, wherein the marking (40) is created by a laser or heat stamp.

9. Step (s101) of applying coating powder to at least one of the first (21) and second (22) sides of at least one section (26) of the adsorption medium (20), The steps include curing the coating powder (s102) to create a solid powder coating (30), A method for manufacturing an air treatment unit (100) according to any one of claims 1 to 8, including the following:

10. The method according to claim 9, wherein the step of applying the coating powder (s101) includes applying static electricity to the adsorption medium (20) or grounding the adsorption medium (20), and then spraying the coating powder onto the adsorption medium (20) with an electrostatic spraying device.

11. The method according to claim 9 or 10, wherein the step of curing the coating powder (s102) includes controlling how deep the curing is performed within the channels (25) of the adsorption medium (20).

12. The method according to any one of claims 9 to 11, further comprising blowing out coating powder of a loose fitting from the channel (25) (s103).

13. The method according to any one of claims 9 to 12, further comprising blowing compressed air into the adsorption medium (20) (s104) before applying the coating powder (s101).

14. The method according to any one of claims 9 to 13, further comprising applying a coating powder (s101) to at least one peripheral side (23) of at least one section (26) of the adsorption medium.

15. The method according to any one of claims 9 to 14, further comprising hardening the solid powder coating (30) in a convection oven (s105).

16. The method according to any one of claims 9 to 15, further comprising marking at least a portion of at least one surface of the adsorption medium (20) by laser or heat stamping (s106).

17. The method according to claim 16, wherein the step of marking at least one surface of the adsorption medium (20) (s106) is performed before the step of applying the coating powder (s101).

18. The aforementioned air processing unit (100) is a gas adsorption rotor for dehumidification, The air processing unit (100) according to any one of claims 1 to 8, wherein the at least one peripheral side (23) is a circumferential side that extends essentially perpendicular to the radial extension of the rotor.

19. The air processing unit (100) is a pad for evaporative cooling, The air handling unit according to any one of claims 1 to 8, wherein at least one peripheral side (23) extends essentially perpendicular to the first side (21) and the second side (22).

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