Moisture absorption device

Abstract

To provide a moisture absorption device that is filled with a high-water absorption resin regenerated without any component adjustment, as a moisture absorbent, while multiple types of high-water absorption resins are mixed.SOLUTION: A moisture absorption device includes: a body part filled with a high-water absorption resin; an introduction part for introducing dehumidification-object air to the body part; and an extracting part for extracting the high-water absorption resin that has absorbed moisture from a lower part of the body part.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a moisture absorbing device filled with a highly water-absorbent resin as a moisture absorbent. [Background technology]

[0002] Products designed to absorb bodily fluids, such as disposable diapers, sanitary napkins, and incontinence pads (hereafter referred to as "sanitary products"), are primarily made from pulp, superabsorbent polymers (hereafter referred to as "SAP"), and plastics, and are in wide use. In addition to sanitary products, SAP has a wide variety of other uses, including agriculture, horticulture, food, and cosmetics, all of which utilize the water absorption and water retention properties of SAP.

[0003] As we enter an aging society, the use of disposable diapers is increasing year by year in ordinary households, hospitals, and welfare facilities. Regarding the disposal of the large amount of used sanitary products, there is a demand to separate and recover the components from used sanitary products and reuse them instead of incineration.

[0004] For example, Patent Document 1 describes a method for reusing regenerated SAP (hereinafter referred to as "regenerated SAP"), which can be used for any application that is not particularly limited to the application in which SAP is used, such as for hygiene products (e.g., disposable diapers, incontinence pads (e.g., light incontinence pads), disposable shorts, sanitary napkins, panty liners, bed sheets), pet sheets, cat litter, soil conditioner, etc. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2022-145758 A Summary of the Invention [Problem to be solved by the invention]

[0006] Used disposable diapers, which are generated in large quantities, are mainly incinerated as waste. However, incineration of used absorbent articles containing a large amount of moisture requires high-temperature treatment and large-sized incineration equipment, which places a large burden on the incineration equipment, such as accelerating the deterioration of the furnace. In addition, from the viewpoint of effective utilization of resources, there is a demand for separating and recovering components from used absorbent articles and reusing them, rather than incineration. In the recycling process of used paper diapers, the separated pulp components can be reused as building materials, etc. Similarly, expanding the uses of the separated recycled superabsorbent resin is also an issue.

[0007] SAPs used in sanitary products are required to have relatively high water absorbency for use in disposable diapers, while those used in sanitary napkins are required to have relatively low water absorbency but excellent gel strength when wet. Also, SAPs with different properties are used depending on whether absorbency or breathability is required for the disposable diaper. Regarding recycled products, those that meet certain standards in terms of water absorption speed, water absorption capacity, etc. are used, but it is difficult to flexibly respond to the various uses of new products as mentioned above. Therefore, the use of recycled SAP for specific purposes has been limited to those that require a wide tolerance for water absorption and breathability, such as soil conditioners. The present invention aims to expand the range of uses by using it as a moisture absorbent.

[0008] An object of the present invention is to provide a moisture absorbing device filled with recycled SAP as a moisture absorbent. [Means for solving the problem]

[0009] As a result of intensive research into the above-mentioned problems, the present inventors have found that it is possible to provide a simple moisture absorbing device that uses SAP as a moisture absorbent, as a new application that utilizes the water absorption properties of SAP. Furthermore, they have found that recycled SAP can also be used as the moisture absorbent for this moisture absorbing device, and have completed the present invention. In the SAP recycling process, SAP is separated from used body fluid absorbent articles and each process is carried out in a specific order to restore the water absorption performance of the SAP. Then, a particle size adjustment process is carried out before commercialization, and the recycled SAP after drying in the recycling process has a wide range of particle sizes before the particle size adjustment process. By adjusting the particle size of the recycled SAP to a certain range that is coarser than the particle size of the product, it is possible to increase the porosity of the recycled SAP in the filled state. This particle size adjustment can increase the breathability of the recycled SAP in the filled state. When the SAP absorbs moisture, it becomes gel-like, its bulk density increases, and it also becomes fluid. Taking advantage of this characteristic, we have found a structure that allows the SAP that has absorbed moisture to be extracted from the bottom. That is, the present invention is a moisture absorbing device filled with the following SAP as a moisture absorbing material.

[0010] The moisture absorption device of the present invention, which is intended to solve the above problems, is characterized by comprising a main body filled with SAP, an introduction section which introduces the air to be dehumidified into the main body, and an extraction section which extracts the SAP in a moisture-absorbed state from the lower part of the main body. The moisture absorption device of the present invention takes advantage of the water absorption properties of SAP, and can be used by simply filling the moisture absorption device with the resin as a moisture absorbent without packaging it as a product specifically tailored for use in sanitary products, etc., and can simply and effectively absorb and remove moisture from the air to be dehumidified, and supply dehumidified air. In addition, the SAP that has absorbed moisture gels and becomes fluid as it absorbs water, and its specific gravity increases relatively, so it sinks to the bottom of the moisture absorber body. By utilizing this property, the SAP that has absorbed moisture can be extracted from the bottom of the moisture absorber body, allowing for smooth renewal of the SAP as a moisture absorbent.

[0011] In one embodiment of the used moisture absorber of the present invention, the SAP is characterized in that it has been regenerated. According to this feature, SAP used as a moisture absorbent does not require specific performance characteristics such as water absorption or gel strength depending on the intended use, so that recycled SAP can be used as it is without any special adjustment of its components.

[0012] Moreover, one embodiment of the moisture absorber of the present invention is characterized in that the particle size of the SAP is mainly in the range of 10 to 20 mm. According to this feature, by adjusting the particle size of SAP within the above range, it is possible to fill the gaps between the particles of SAP as a moisture absorbent with an appropriate airflow resistance. Even if the air to be dehumidified is biased, when that area absorbs moisture and the airflow resistance increases, the moisture will flow around to other areas, resulting in an even moisture absorption state and making it possible to more effectively dehumidify the air to be dehumidified.

[0013] Furthermore, one embodiment of the used moisture absorber of the present invention is characterized in that the amount of extraction by the extraction section is controlled based on the pressure difference between the inlet side pressure of the air to be dehumidified and the outlet side pressure of the dehumidified air. According to this feature, the layer of SAP near the inlet side of the air to be dehumidified swells due to moisture absorption, and the gaps between the particles become smaller, so the pressure loss of the flow of the air to be dehumidified increases. On the other hand, the pressure loss of the exhaust side of the dehumidified air does not change because it is the head space of the moisture absorption device. When this pressure difference exceeds a predetermined value, the SAP that has absorbed moisture and become fluidized is extracted from the extraction section, so that the SAP can be smoothly renewed and the moisture absorption performance of the moisture absorption device can be easily maintained at a certain level or higher. Effect of the Invention

[0014] According to the present invention, it is possible to provide a simple moisture absorbing device that utilizes the properties of SAP and can easily extract absorbent material that has absorbed moisture. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1 is a schematic cross-sectional view showing a cross-sectional configuration of a moisture absorber according to a first embodiment of the present invention. [Diagram 2] 2 is a schematic plan view showing an example of the arrangement of piping for air to be dehumidified inside the moisture absorber in the first embodiment of the present invention, seen from the line AA. FIG. [Diagram 3]FIG. 11 is a schematic cross-sectional view showing the configuration of a moisture absorber according to a fourth embodiment of the present invention, as viewed from a cross section. [Figure 4] FIG. 11 is a schematic diagram showing the function of a withdrawal control section in a moisture absorber according to a fourth embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the moisture absorbing device according to the present invention will be described in detail with reference to the drawings. The moisture absorbent device described in the embodiment is merely an example for explaining the moisture absorbent device according to the present invention, and the present invention is not limited to this. Although the description will be given mainly using stored disposable diapers as an example, the present invention is not limited thereto.

[0017] The present invention aims to expand the applications of recycled SAP by using the recycled SAP as a moisture absorbent. Therefore, the used SAP before being turned into the recycled SAP of the present invention may be one that has been used as a moisture absorbent in sanitary products, etc., and there are no particular limitations on the specific structure or composition.

[0018] The sanitary products generally refer to well-known items that absorb body fluids and are sold and used as disposable sanitary products, such as paper diapers (for children and adults), incontinence pads, sanitary napkins, and breast pads.

[0019] Recycled SAP is made from used disposable diapers (for both children and adults), incontinence pads, sanitary napkins, breast pads, etc., and is recycled through a recycling process.

[0020] [First embodiment] 1 is a schematic cross-sectional view showing the cross-sectional configuration of a moisture absorbent according to a first embodiment of the present invention. The upper direction in FIG. 1 is the upper direction of the moisture absorbent 10, and the lower direction in FIG. 1 is the lower direction of the moisture absorbent 10. The main body of the moisture absorber 10 consists of a moisture absorber container 11, and SAP is filled inside the moisture absorber container 11. An introduction section for introducing air to be dehumidified into the main body consists of air to be dehumidified piping 21. An extraction section for extracting the SAP in a moisture-absorbed state from the lower part of the main body consists of an extraction pipe 23 connected at one end to the lower end of the moisture absorber container cone part 11a at the lower part of the moisture absorber container 11, and an extraction pump 24 connected to the extraction pipe 23 at the other end of the extraction pipe 23. Regenerated SAP is suitable as the moisture absorbent material to be filled. When obtaining the regenerated SAP, the SAP is separated from a used absorbent article, and each treatment is carried out in a predetermined order to restore the water absorption performance of the SAP. The performance of the SAP obtained from a used absorbent article varies depending on the original absorbent article. When using the regenerated SAP as a sanitary product or the like, it may be necessary to adjust the amount of absorption, liquid permeability, absorption speed, etc. required for the product, such as by mixing a portion of virgin SAP. However, for the application as a moisture absorbent material in the present invention, the regenerated SAP can be used as it is. SAP is called dry SAP 12a, wet SAP 12b, and gel-like SAP 12c according to its moisture absorption state. This is for the sake of convenience in describing the change in form of SAP that occurs as SAP absorbs moisture through moisture absorption as the operation of the moisture absorption device 10 progresses.

[0021] The moisture absorber according to the first embodiment of the present invention will be specifically described below. In the moisture absorber 10 according to this embodiment, the moisture absorber container 11 is filled with dry SAP 12a as a desiccant. The lower part of the moisture absorber container 11 is provided with a dehumidified air pipe 21 for drawing the air to be dehumidified 41 into the moisture absorber container 11. The upper part of the moisture absorber container 11 is provided with a dehumidified air pipe 22 for sending the dehumidified air 42 to a supply destination. The lower part of the moisture absorber container 11 is formed with a moisture absorber container cone part 11a whose cross section decreases downward, and is connected to a drawing pipe 23. The moisture absorber container cone part 11a may be shaped like an upside-down truncated cone or an upside-down truncated pyramid.

[0022] 2 is a schematic plan view of an example of the arrangement of the air pipe to be dehumidified inside the moisture absorber in the first embodiment of the present invention, seen from the AA direction. As shown in FIG. 2, the air pipe to be dehumidified 21 branches after entering the moisture absorber container 11, and one branch branches into the air pipe to be dehumidified 21a, which is connected to the air pipe to be dehumidified 21b. The other branch branches into the air pipe to be dehumidified 21c. The air pipe to be dehumidified 21 inside the moisture absorber container 11 and the branched air pipe to be dehumidified 21a, air pipe to be dehumidified 21b, and air pipe to be dehumidified 21c are arranged so as not to overlap the drawing pipe 23 in a plane and so that the air to be dehumidified 41 is supplied as evenly as possible to the entire cross section of the moisture absorber container 11.

[0023] The dehumidification target air pipe 21, the dehumidification target air pipe 21a, the dehumidification target air pipe 21b, and the dehumidification target air pipe 21c are provided with a dehumidification target air pipe (not shown) for blowing the dehumidification target air 41 into the moisture absorption device 10. The air blowing nozzles are provided facing downwards in the respective pipes. As a result, the air to be dehumidified 41 is once blown downwards through the air to be dehumidified pipes 21, 21a, 21b, and 21c, then changes direction to flow upwards, passes through a layer filled with dry SAP 12a as a desiccant, and reaches the inlet of the dehumidified air pipe 22, where the dehumidified air 42 is sent to the supply destination.

[0024] Air to be dehumidified 41 drawn into moisture absorber 10 flows upward through a layer filled with dry SAP 12a as a desiccant. The upward flow of air to be dehumidified 41 passes through the gaps between particles of dry SAP 12a that are filled inside moisture absorber 10 as a desiccant. When air to be dehumidified 41 passes through the gaps between particles of dry SAP 12a, moisture contained as water vapor in air to be dehumidified 41 is removed due to the water absorption property of SAP. Due to this effect, the air that reaches the inlet of dehumidified air piping 22 becomes dehumidified air 42. SAP has an equilibrium moisture absorption rate, and repeatedly absorbs and releases moisture in response to humidity. The amount of moisture absorbed when the SAP and the atmosphere are in moisture equilibrium is the equilibrium moisture absorption rate for the temperature and water vapor pressure of the atmosphere, and the ratio of this to the standard dry weight of the SAP is the equilibrium moisture absorption rate. At a constant temperature, the equilibrium moisture absorption rate increases as the water vapor pressure increases, and at a constant water vapor pressure, it decreases as the temperature increases.

[0025] Dry SAP 12a filled inside moisture absorber 10 as a desiccant absorbs moisture in air 41 to be dehumidified upon contact with air 41 to be dehumidified, gradually becoming moist, and as it absorbs more moisture, it turns into a gel and becomes fluid. The upward flow of air 41 to be dehumidified passes through gaps between the particles of dry SAP 12a in a dry state and is absorbed by the air, and reaches head space 13 of moisture absorber container 11.

[0026] On the other hand, the specific gravity of the SAP that has absorbed moisture from the air to be dehumidified 41 and has gradually become moist increases. SAP that has become moist but has not yet reached a gel state gradually gathers below dry SAP 12a, as shown as wet SAP 12b in FIG. If there are gaps between the particles of wet SAP 12b that have gathered below dry SAP 12a, the air to be dehumidified 41 passes through them, and as a result, the SAP absorbs more moisture. As wet SAP 12b continues to absorb moisture, the SAP gradually turns into a gel. This is because the SAP approaches a saturated state, which is the amount of water that the SAP can absorb based on its inherent performance. As shown by gelled SAP 12c in Figure 1, the specific gravity of gelled SAP is even greater than that of wet SAP 12b, and, coupled with its fluidity, it gathers below wet SAP 12b.

[0027] The gel-like SAP 12c is saturated in terms of water absorption, and further water absorption cannot be expected, so it can be said that it has lost its performance as a moisture absorbent. In addition, since there are almost no gaps between the particles, it may become an obstacle to the flow of the air 41 to be dehumidified, and therefore it is necessary to remove it from the moisture absorber container 11. In the moisture absorber of the first embodiment of the present invention, gel-like SAP 12c collects near the moisture absorber cone 11a, which is the lower part of the moisture absorber container 11, and is removed from the moisture absorber container 11 by drawing it out through drawing tube 23 connected to the lower end of moisture absorber cone 11a.

[0028] The drawing pipe 23, which is connected to the lower end of the moisture absorber container cone part 11a of the drawing pipe 23, is connected to an extraction pump 24 outside the moisture absorber container 11. By operating the extraction pump 24, the gel-like SAP 12c that has collected near the moisture absorber container cone part 11a, which is the lower part of the moisture absorber container 11, is discharged from the drawing pipe 23 to the outside of the moisture absorber container 11. As the gel-like SAP 12c is discharged from the drawing tube 23 to the outside of the moisture absorber vessel 11, the amount of gel-like SAP 12c that has collected near the moisture absorber vessel cone 11a decreases, and the wet SAP 12b present above the gel-like SAP 12c is replaced by the gel-like SAP 12c. As the moisture absorber 10 continues to operate, the amount of water absorbed by the wet SAP 12b also gradually increases, and it changes into gel-like SAP 12c. The gel-like SAP 12c is discharged from the drawing tube 23 to the outside of the moisture absorber vessel 11, and is replaced by an amount of wet SAP 12b equivalent to the discharged gel-like SAP 12c.

[0029] Dry SAP 12a, which has not yet absorbed moisture, absorbs the air 41 to be dehumidified as the upward flow of the air to be dehumidified 41 comes into contact with the particles of dry SAP 12a and passes through the gaps between them. As the moisture absorber 10 operates, the dry SAP 12a gradually changes into wet SAP 12b, and at the same time, due to the difference in specific gravity between dry SAP 12a and wet SAP 12b, the wet SAP 12b moves to the bottom of the layer of dry SAP 12a. If the moisture absorber 10 continues to operate, the wet SAP 12b also absorbs moisture and changes into gel-like SAP 12c. When the gel-like SAP 12c that has previously gathered near the moisture absorber container cone 11a, which is the bottom part of the moisture absorber container 11, is discharged from the drawing tube 23 to the outside of the moisture absorber container 11, the layer of gel-like SAP 12c as a whole moves below the moisture absorber container cone 11a. At the same time, the wet SAP 12b above the layer of gelled SAP 12c and the dry SAP 12a above it also move toward the moisture absorber container cone 11a. As the wet SAP 12b and dry SAP 12a move, mixing occurs near the boundary between them. During this mixing, the wet SAP 12b moves more downward than the dry SAP 12a because of the difference in specific gravity between the wet SAP 12b and the dry SAP 12a. Furthermore, the wet SAP 12b that has absorbed more moisture moves more downward than the wet SAP 12b that has not absorbed much moisture.

[0030] As the moisture absorption of SAP as a moisture absorbent progresses with the continued operation of the moisture absorber 10, the closer the SAP is to a saturated state, the more it collects in the gel-like SAP 12c and the moisture absorber container cone 11a and is more likely to be discharged outside the moisture absorber container 11. The SAP that is discharged outside the moisture absorber container 11 is replaced with new dry SAP 12a by introducing dry SAP 12a (not shown) into the moisture absorber container 11. In this manner, by intermittently renewing the absorbent material in the moisture absorber container 11, the moisture absorber 10 can continue to operate while maintaining its moisture absorption performance.

[0031] [Second embodiment] The moisture absorbing device 10 according to the second embodiment will be described below. In the second embodiment, the same components as those in the first embodiment are given the same reference numerals as those in the first embodiment, and detailed descriptions thereof will be omitted. The same applies to the third and fourth embodiments. The SAP used as the moisture absorbent of the moisture absorbent device 10 in the second embodiment of the present invention is a regenerated one. In the moisture absorber 10 according to the second embodiment of the present invention, the regenerated SAP can be used as a moisture absorbent without any particular component adjustment, which also provides a new application for the regenerated superabsorbent resin.

[0032] [Third embodiment] The SAP serving as the absorbent in the moisture absorbing device 10 according to the third embodiment of the present invention is characterized in that its particle size is 10 to 20 mm. In the moisture absorbing device 10 according to the present invention, the moisture absorbing device 10 is filled with SAP as the absorbent. Air to be dehumidified 41 is introduced from the lower part of the moisture absorbing device 10, and the dehumidified air is supplied to the user of the dry air as dehumidified air 42 from the lower part of the moisture absorbing device 10. Inside the moisture absorbing device 10, the air to be dehumidified 41 introduced from the lower part of the moisture absorbing device 10 flows as an upward flow through the gaps between the particles of SAP that are filled as the absorbent. The air to be dehumidified 41 that flows through the gaps between the particles of SAP comes into contact with the particles of SAP, and the moisture contained in the air to be dehumidified 41 is absorbed by the SAP. Therefore, it is desirable that the size and distribution of the gaps between SAP particles be nearly uniform throughout the entire layer of SAP that is filled in as a moisture absorbent.By adjusting the particle size of SAP to between 10 and 20 mm, the size and distribution of the gaps between SAP particles can be made nearly uniform, and a moisture absorption effect can be expected throughout the entire SAP.

[0033] [Fourth embodiment] The moisture absorber 10 in the fourth embodiment of the present invention is a moisture absorber 10 that controls the extraction amount of the extraction section based on the pressure difference between the inlet pressure of the air to be dehumidified and the outlet pressure of the dehumidified air. Fig. 3 is a schematic cross-sectional view showing the configuration of a moisture absorbent in a fourth embodiment of the present invention. Fig. 4 is a schematic view showing the function of the extraction control unit in the moisture absorbent in the fourth embodiment of the present invention. Explanations of parts that overlap with those in the first embodiment will be omitted.

[0034] The moisture adsorbing apparatus 10 in the fourth embodiment of the present invention is provided with a differential pressure gauge 31 that detects the pressure of the air inside. A high-pressure side measurement port 31a of the differential pressure gauge 31 is installed in the vicinity of the upper part of the air piping 21 to be dehumidified. In addition, a low-pressure side measurement port 31b is installed in the head space 13. The head space 13 is a space inside the moisture adsorbing apparatus 10 that is not filled with the dry SAP 12a serving as a desiccant. The differential pressure gauge 31 measures the pressure difference between the pressure in the vicinity of the upper part of the air piping 21 to be dehumidified and the head space 13.

[0035] High-pressure side measurement port 31a detects a pressure rise caused by an increase in pressure resistance to the flow of air to be dehumidified 41 as a result of SAP absorbing moisture, causing the SAP particles to swell and the spaces between the SAP particles to decrease. Therefore, the position of high-pressure side measurement port 31a is not limited to the upper vicinity of air to be dehumidified piping 21, and may be any location where moisture absorption into air to be dehumidified 41 actively progresses.

[0036] The differential pressure of the differential pressure gauge 31 is transmitted as a signal to the withdrawal control unit 51. As shown in Fig. 4, the withdrawal control unit 51 includes a differential pressure receiving unit 511, a storage unit 512, a calculation unit 513, and a withdrawal pump operation unit 514. The withdrawal pump operation unit 514 serves as an operation unit for the withdrawal pump 24. The differential pressure signal of the differential pressure gauge 31 is received by a differential pressure receiving unit 511. The differential pressure data received by the differential pressure receiving unit 511 is sent to and stored in a memory unit 512. Two pressure values ​​are preset in the memory unit 512, which correspond to the timing at which the extraction pump 24 starts and stops operating in order to extract the wet SAP 12b. These two pressure values ​​can be rewritten in the memory unit 512.

[0037] The calculation unit 513 compares the differential pressure data of the pressure gauge 31 with pressure value data representing the timing to start and stop the operation of the withdrawal pump 24. When the differential pressure data of the pressure gauge 31 becomes greater than the pressure value representing the timing to start the operation of the withdrawal pump 24, the calculation unit 513 transmits a signal to the withdrawal pump operation unit 514 to start the operation of the withdrawal pump 24. Having received the signal to start the operation of the withdrawal pump 24, the withdrawal pump operation unit 514 starts the operation of the withdrawal pump 24. When the differential pressure data from the pressure gauge 31 becomes smaller than the pressure value at which it is time to stop the operation of the withdrawal pump 24, the calculation unit 513 transmits a signal to the withdrawal pump operation unit 514 to stop the operation of the withdrawal pump 24. Having received the signal to stop the operation of the withdrawal pump 24, the withdrawal pump operation unit 514 stops the operation of the withdrawal pump 24.

[0038] In this way, the differential pressure gauge 31 and the withdrawal control unit 51 can operate the withdrawal pump 24 as needed. This makes it possible to automatically and intermittently renew the absorbent material in the moisture absorber container 11, and the moisture absorber 10 can continue to operate while maintaining its moisture absorption performance.

[0039] The gel-like SAP 12c extracted by the extraction pump 24 can be regenerated again by feeding it into a regeneration process, and can be used as a moisture absorbent in the moisture absorption device 10. If the extracted gel-like SAP 12c has absorbed moisture but is not contaminated, it can be regenerated by only going through the drying process, omitting the cleaning step and other regeneration steps of the regeneration process. If the moisture absorber 10 is installed at a used SAP recycling plant, the recycled SAP can be recycled and reused even after it has been used as a moisture absorbent by repeatedly regenerating it. Used SAP that has been through the drying process in the used SAP recycling process is at a high temperature and moisture condenses on the surface during the cooling process, so it needs to be dehumidified with dehumidified air. This dehumidified air has been dehumidified by the moisture absorber 10, but the desiccant is also regenerated SAP. [Explanation of symbols]

[0040] 10 moisture absorber, 11 moisture absorber container, 11a moisture absorber container cone, 12a dry SAP, 12b wet SAP, 12c gel SAP, 21, 21a, 21b, 21c dehumidified air piping, 22 dehumidified air piping, 23 withdrawal pipe, 24 withdrawal pump, 31 differential pressure gauge, 31a high pressure side measurement port, 31b low pressure side measurement port, 41 dehumidified air, 42 dehumidified air, 51 withdrawal control unit, 511 differential pressure receiving unit, 512 memory unit, 513 calculation unit, 514 withdrawal pump operation unit

Claims

1. A main body filled with a highly absorbent resin; An introduction section that introduces air to be dehumidified into the main body section; an extracting section for extracting the highly water-absorbent polymer in a humid state from a lower portion of the main body; A moisture absorbing device comprising:

2. 2. The moisture absorbent according to claim 1, wherein the highly water-absorbent resin is a regenerated resin.

3. 3. The moisture absorber according to claim 1, wherein the particle size of the highly water-absorbent resin is 10 to 20 mm.

4. 4. The moisture absorber according to claim 1, wherein the amount of air extracted by the extraction section is controlled based on a pressure difference between an inlet pressure of the air to be dehumidified and an outlet pressure of the dehumidified air.

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