JP2022050053A - Sheet for spacing member and total heat exchanger - Google Patents

Abstract

To provide a spacing member and a total heat exchanger wherein the generation of condensation water is prevented.SOLUTION: The present invention discloses sheets for spacing members of a total heat exchanger, wherein the total heat exchanger has a plurality of partition members, and spacing members that form an air passage between the plurality of partition members and hold the space between the partition members. The sheets for spacing members include cellulose fiber as the main component and further include a moisture absorbent and a surfactant.SELECTED DRAWING: Figure 1

Description

The present invention relates to a sheet for spacing members and a total heat exchange element.

Conventionally, a heat exchanger is known as a device for ventilating without impairing the effects of cooling and heating. In the heat exchanger, heat is exchanged between two types of airflow, supply air and exhaust air, during ventilation. Total heat exchange elements are widely used in heat exchangers. The total heat exchange element has a structure in which sheet-shaped partition members are alternately bonded via corrugated plate-shaped spacing members. Since the corrugated sheet-shaped spacing member forms an air flow path between the partition members, the air supply path for introducing the outdoor air into the room and the exhaust path for discharging the indoor air to the outside are separated. Become.

This spacing member is required to have high hygroscopicity in order to exchange heat of latent heat (humidity) at the same time as sensible heat (temperature) while blocking ventilation of the air supply path and the exhaust path. Therefore, as the spacing member, a paper base material holding a hygroscopic agent is used. When the moisture absorbing agent is held in the space member, it becomes easy to absorb the moisture inside, so that the water vapor can move smoothly and the latent heat (humidity) can be exchanged efficiently.

For example, Patent Documents 1 and 2 disclose a partition member having a water-soluble hygroscopic agent and a total heat exchange element having a spacing member. Cited Document 1 discloses a technique of adding a water-soluble hygroscopic agent to an interval member in order to suppress the outflow of the water-soluble hygroscopic agent possessed by the partition member. Further, in Patent Document 2, a spacing member having water retention is used in which the spacing member is impregnated with a water-absorbent resin.

International Publication No. 2008/041327 International Publication No. 2009/004695

However, in the total heat exchange element in the prior art, dew condensation water may be generated on the spacing member or the like depending on the usage environment, which has been a problem. Such generation of dew condensation causes serious problems such as a tracking phenomenon in a device having a total heat exchange element, and therefore improvement has been sought.

Therefore, in order to solve the problems of the prior art, the present inventors have proceeded with studies for the purpose of providing an interval member and a total heat exchange element in which the generation of dew condensation water is suppressed.

As a result of diligent studies to solve the above problems, the present inventors have generated dew condensation water by adding a hygroscopic agent and a surfactant to a sheet for an interval member containing a cellulose fiber as a main component. It has been found that a sheet for an interval member in which the amount of water is suppressed can be obtained.
Specifically, the present invention has the following configurations.

[1] For a total heat exchange element used for a total heat exchange element including a plurality of partition members and a plurality of interval members that form an air flow path between the plurality of partition members and maintain a distance between the partition members. It is a sheet for the space member of
Contains cellulose fiber as the main component,
A sheet for spacing members further comprising a hygroscopic agent and a surfactant.
[2] The sheet for an interval member according to [1], which has a Cobb water absorption rate of 30 to 100 g / m ² .
[3] The sheet for an interval member according to [1] or [2], wherein the hygroscopic agent is at least one selected from the group consisting of calcium chloride and lithium chloride.
[4] The spacing member sheet according to any one of [1] to [3], wherein the content of the hygroscopic agent is 2 to 30 g per 1 m ² of the spacing member sheet.
[5] The sheet for a spacing member according to any one of [1] to [4], wherein the surfactant is a nonionic surfactant.
[6] The sheet for spacing members according to any one of [1] to [5].
For sheets containing cellulose fiber as the main component,
A method for producing a sheet for an interval member, which comprises applying or impregnating a solution containing a hygroscopic agent and a surfactant.
[7] A total heat exchange element including a plurality of spacing members made of the spacing member sheet according to any one of [1] to [5] and a plurality of partitioning members.
The spacing member is a total heat exchange element that forms an air flow path between a plurality of partitioning members and maintains the spacing between the partitioning members.

According to the present invention, it is possible to obtain a sheet for an interval member in which the generation of dew condensation water is suppressed.

FIG. 1 is a schematic diagram illustrating the structure of the total heat exchange element.

Hereinafter, the present invention will be described in detail. The description of the constituent elements described below may be based on typical embodiments and specific examples, but the present invention is not limited to such embodiments. In addition, the numerical range represented by using "-" in this specification means the range including the numerical values before and after "-" as the lower limit value and the upper limit value.

(Total heat exchange element)
The present invention relates to a total heat exchange element including a plurality of partition members and a plurality of interval members that form an air flow path between the plurality of partition members and maintain a distance between the partition members. Here, the spacing member contains cellulose fibers as a main component, and further contains a hygroscopic agent and a surfactant. Since the total heat exchange element of the present invention has the above configuration, the generation of dew condensation water inside is suppressed.

FIG. 1 is a schematic diagram illustrating the structure of the total heat exchange element 10 according to the present embodiment. As shown in FIG. 1, the total heat exchange element 10 forms an air flow path between a plurality of partition members 1 and a plurality of partition members 1, and also maintains a distance between the partition members 1. It is composed of 2. The partition member 1 is a flat plate such as a square or a rhombus, and the spacing member 2 is a corrugated plate having a sawtooth or sinusoidal waveform whose projected plane shape matches the shape of the partition member 1. The spacing member 2 has a shape like, for example, a corrugated cardboard core, and is formed by corrugated processing.

The corrugated ridge line portion and valley line portion of the interval member 2 are joined to the partition member 1 by an adhesive or the like. The spacing member 2 is joined to the partition member 1 with the direction of the corrugated ridge extending in the first direction (for example, the vertical direction) on one surface side of the partition member 1 and the other surface. On the side, the corrugated ridge line is joined to the partition member 1 in a state of extending in the second direction (for example, the lateral direction). That is, in the two spacing members 2 adjacent to each other with the partition member 1 interposed therebetween, the direction of the ridgeline of the waveform on one surface side and the direction of the ridgeline of the waveform on the other surface side are alternately laminated so as to be orthogonal to each other.

As a method of joining the space member 2 and the partition member 1, a method using an adhesive or a heat bonding method using no adhesive can be adopted. Above all, the method using an adhesive is preferable because the spacing member 2 and the partition member 1 can be firmly adhered to each other. As the adhesive, known adhesives such as polyvinyl alcohol-based adhesives and polyvinyl acetate-based adhesives can be used. Further, the adhesive may contain a hygroscopic agent. Examples of the hygroscopic agent that can be blended include calcium chloride, magnesium chloride, lithium chloride and the like. Further, the adhesive may contain a fungicide, a thickener, or the like.

A plurality of first air flow paths 4 are formed along the first direction between the spacing member 2 whose corrugated ridge line is in the first direction (for example, the vertical direction) and the partition members 1 on both sides. Has been done. Further, a plurality of second air flow paths 5 are provided along the second direction between the spacing member 2 whose corrugated ridge line is in the second direction (for example, the lateral direction) and the partition members 1 on both sides. Is formed. The arrow 6 in FIG. 1 indicates the air flow direction in the first air flow path 4, and the arrow 7 in FIG. 1 indicates the air flow direction in the second air flow path 5.

The spacing member 2 having the direction of the ridgeline of the waveform as the first direction and the spacing member 2 having the direction of the ridgeline of the waveform as the second direction are orthogonal to each other while sandwiching the partition member 1. Since they are stacked alternately, the first air flow path 4 and the second air flow path 5 are also formed alternately so that their extending directions are orthogonal to each other. For example, the supply air is ventilated to the first air flow path 4 and the exhaust gas is ventilated to the second air flow path 5, and heat exchange is performed between the supply air and the exhaust gas via the partition member 1 and the spacing member 2. It is supposed to be done.

It is preferable that the first direction and the second direction are orthogonal to each other, but the intersection angle between the first direction and the second direction may be appropriately adjusted according to the shape of the partition member 1. The intersection angle between the first direction and the second direction may be, for example, 30 ° to 150 °. For example, when the partition member 1 is square, the intersection angle between the first direction and the second direction is preferably 90 °, and when the partition member 1 is a rhombus, the intersection angle between the first direction and the second direction is preferable. Is preferably close to the angle at which the lines connecting the midpoints of the opposing sides of the partition member 1 intersect.

The average pitch of the waveform of the spacing member 2 is preferably 1.5 to 8 mm, more preferably 2 to 7 mm, and even more preferably 4 to 6.5 mm. The average height of the waveform of the spacing member 2 is preferably 1 to 5 mm, more preferably 1.3 to 4 mm, and even more preferably 1.5 to 3.5 mm. When the average pitch and the average height of the waveform of the interval member 2 are equal to or more than the preferable lower limit values, it becomes easy to secure the ventilation of the first air flow path 4 and the second air flow path 5. When the average pitch and the average height of the waveform of the interval member 2 are equal to or less than the preferable upper limit values, it is easy to secure the contact between the gas passing through the first air flow path 4 and the second air flow path 5 and the partition member 1. , It becomes easier to secure the efficiency of heat exchange.

The total heat exchange element 10 is formed by alternately laminating both sides of the corrugated ridge line portion and valley line portion of the spacing member sheet in a state of being adhered to the partition member sheet, and then cutting into a predetermined shape. Manufactured. At the time of laminating, the sheet for the interval member having the direction of the corrugated ridge line as the first direction and the sheet for the interval member having the direction of the corrugated ridge line as the second direction are the sheets for the partition member. Are sandwiched between them and stacked so as to repeat alternately.

(Sheet for spacing member)
The spacing member sheet is a sheet for forming the above-mentioned corrugated spacing member. That is, the spacing member sheet is used for a total heat exchange element including a plurality of partitioning members and a plurality of spacing members that form an air flow path between the plurality of partitioning members and maintain the spacing between the partitioning members. It is a sheet for a spacing member for a total heat exchange element, and is a flat plate-shaped sheet before the corrugated shape of the spacing member is formed. The spacing member sheet contains cellulose fibers as a main component, and further contains a hygroscopic agent and a surfactant. By including the hygroscopic agent in the spacing member sheet, it is possible to prevent the hygroscopic agent from flowing out from the partition member to the spacing member.

The spacing member sheet contains cellulose fibers as a main component. Here, the "main component" means a component having a ratio of 50% by mass or more to the total mass of the spacing member sheet. The spacing member sheet is preferably composed of pulp containing cellulose fibers. Examples of pulp containing cellulose fibers include wood pulp and non-wood pulp. Examples of wood pulp include softwood pulp and hardwood pulp. Examples of non-wood pulp include hemp pulp, kenaf pulp, bamboo pulp and the like. As the wood pulp, softwood pulp is preferable, and softwood kraft pulp (NBKP) is more preferable, because the strength of the base paper and the CO ₂ barrier property are further enhanced. In addition, these pulps may be used alone or in combination of two or more.

The wood pulp may have undergone a cooking step and / or a bleaching step. Generally, as the wood pulp, one that has undergone various cooking steps or bleaching steps in order to remove components other than cellulose from the raw wood is used. In the present embodiment, the cooking step and the bleaching step are not particularly limited, and a known method can be used as appropriate.

The spacing member sheet may further contain fibers other than the cellulose fibers. Examples of other fibers include synthetic fibers such as rayon fiber, polyethylene fiber, polypropylene fiber and polyester fiber.

The spacing member sheet contains a hygroscopic agent. Examples of the hygroscopic agent include inorganic acid salts, organic acid salts, polyhydric alcohols, ureas and the like. For example, examples of the inorganic acid salt include lithium chloride, calcium chloride, magnesium chloride and the like. Examples of the organic acid salt include sodium lactate, calcium lactate, sodium pyrrolidone carboxylate and the like. Examples of the polyhydric alcohol include glycerin, ethylene glycol, triethylene glycol, polyglycerin and the like. Examples of ureas include urea and hydroxyethyl urea. Above all, the hygroscopic agent is preferably at least one selected from the group consisting of calcium chloride and lithium chloride. Since calcium chloride and magnesium chloride have flame retardancy, when one or more of these hygroscopic agents are retained, the flame retardancy of the spacing member sheet can be enhanced.

The hygroscopic agent may be held in at least a part of the space member sheet, but is preferably held in at least a part of both sides of the space member sheet, and is preferably held in at least a part of both sides of the space member sheet. It is more preferable that it is held in the region. The state in which the hygroscopic agent is held on the surface of the space member sheet may be a state in which the hygroscopic agent adheres to the surface of the space member sheet, or in a gap between fibers near the surface of the space member sheet. It may be in a state of being intruded. When the hygroscopic agent has entered the gaps between the fibers near the surface of the spacing member sheet, the concentration of the spacing member sheet in the thickness direction may be uniform, and the concentration may be uniform from the surface of the spacing member sheet to the inside. May have a concentration gradient such that From the viewpoint of improving the moisture permeability of the spacing member sheet, the spacing member sheet has a concentration gradient of the hygroscopic agent such that the concentration decreases inward from the surface of the spacing member sheet. Is preferable.

The content of the hygroscopic agent in the spacing member sheet is preferably 2 g or more, more preferably 3 g or more, and even more preferably 5 g or more per 1 m ² of the spacing member sheet. The content of the hygroscopic agent in the spacing member sheet is preferably 30 g or less, more preferably 20 g or less, and even more preferably 15 g or less per 1 m ² of the spacing member sheet. The content of the hygroscopic agent in the above-mentioned sheet for the interval member is an anhydrous equivalent amount. By setting the content of the hygroscopic agent within the above range, it is possible to more effectively suppress the generation of dew condensation water on the interval members in the total heat exchange element. Here, when calcium chloride is used as the hygroscopic agent, calcium chloride has high hygroscopicity and usually retains water of crystallization, and it is difficult to calculate the amount of adhesion due to the dry mass. Therefore, the content of calcium chloride can be calculated by multiplying the wet adhesion amount of the aqueous solution of calcium chloride by the concentration of calcium chloride as an anhydrate. The concentration of calcium chloride (anhydride) in the calcium chloride aqueous solution can be determined by the EDTA titration method.

When calcium chloride is used as the hygroscopic agent, the content of calcium chloride is preferably 2 g or more, more preferably 3 g or more, and further preferably 5 g or more per 1 m ² of the spacing member sheet. The content of the hygroscopic agent in the spacing member sheet is preferably 30 g or less, more preferably 20 g or less, and even more preferably 15 g or less per 1 m ² of the spacing member sheet. By setting the content of calcium chloride within the above range, the moisture absorption / desorption performance and flame retardancy can be improved. Further, by setting the content of calcium chloride within the above range, it is possible to more effectively suppress the generation of dew condensation water on the interval member.

The spacing member sheet contains a surfactant. Examples of the surfactant include anionic surfactants such as alkyl sulfate ester salts, polyoxyethylene alkyl sulfate ester salts, alkylbenzene sulfonates and α-olefin sulfonates, alkyltrimethylammonium chloride, dialkyldimethylammonium chloride and benzalco chloride. Cationic surfactants such as nium; Amphoteric surfactants such as trimethylglycine, alkyldimethylaminoacetic acid betaine, alkylamide dimethylaminoacetic acid betaine; ethylene oxide adducts of acetylene glycol, polyoxyethylene alkyl ethers, polyoxyethylene polyoxy Examples thereof include polyoxyethylene polyoxypropylene ethers such as propylene glycol, fatty acid esters such as fatty acid sorbitan esters and polyethylene glycol fatty acid esters, and nonionic surfactants such as alkyl monoglyceryl ethers, alkyl polyglucosides and fatty acid diethanolamides. Above all, the surfactant is preferably a nonionic surfactant.

The content of the surfactant in the spacing member sheet is not particularly limited, but is preferably 10 g or less, more preferably 5 g or less, and 2 g or less per 1 m ² of the spacing member sheet. Is even more preferable. Further, the lower limit of the content of the surfactant in the sheet for the spacing member can be, for example, 0.01 g. By setting the content of the surfactant within the above range, it is possible to more effectively suppress the generation of dew condensation water on the interval member in the total heat exchange element. Further, by blending the surfactant into the spacing member sheet, the amount of the chemical liquid absorbed by the spacing member sheet base paper is increased, and as a result, the holding amount of the hygroscopic agent can be efficiently increased.

The sheet for a spacing member may contain an arbitrary component as long as the effect of the present invention is not impaired. Examples of the optional component include a sizing agent, a paper strength enhancer, a colorant, a humidity control agent, a fungicide, a flame retardant and the like. The optional component may be in a state of being attached to the surface of the spacing member sheet, or may be in a state of being inserted into the gaps between the fibers of the spacing member sheet.

The Cobb water absorption of the spacing member sheet is preferably 30 g / m ² or more, more preferably 35 g / m ² or more, and even more preferably 40 g / m ² or more. The Cobb water absorption of the spacing member sheet is preferably 100 g / m ² or less, more preferably 95 g / m ² or less, and even more preferably 90 g / m ² or less. The Cobb water absorption of the spacing member sheet is a value measured according to JIS P 8140 except that the contact time is 30 seconds. By keeping the Cobb water absorption of the spacing member sheet within the above range, the water retention of the spacing member sheet can be enhanced, and as a result, the generation of dew condensation water on the spacing member sheet can be more effectively suppressed. can do.

The hygroscopicity of the spacing member sheet is preferably 10% or more, more preferably 12% or more, and even more preferably 15% or more. The hygroscopicity of the spacing member sheet is preferably 50% or less, more preferably 40% or less, and even more preferably 30% or less. The hygroscopicity of the spacing member sheet is a value calculated by the following formula.
Hygroscopicity (%) = (BA) / A × 100
Here, in A, the spacing member sheet is placed under the conditions of 23 ° C. and 50% relative humidity for 24 hours, and after adjusting the humidity, it is placed in a weighing bottle (with a lid), dried at 105 ° C. for 1 hour, and completely dried. In terms of mass, B is the humidity control mass when the sheet for the interval member after absolute drying is placed in a constant temperature and constant humidity bath at 20 ° C. and a relative humidity of 65% for 3 hours.

The basis weight of the spacing member sheet is preferably 40 g / m ² or more, more preferably 45 g / m ² or more, and even more preferably 50 g / m ² or more. The basis weight of the spacing member sheet is preferably 200 g / m ² or less, more preferably 150 g / m ² or less, and even more preferably 120 g / m ² or less. By setting the basis weight of the spacing member sheet within the above range, the thermal conductivity can be increased and the heat exchange efficiency can be improved. Further, by setting the basis weight of the spacing member sheet within the above range, water retention can be enhanced, so that the generation of dew condensation water can be suppressed more effectively. The basis weight of the spacing member sheet is measured in accordance with JIS P 8124 (2011).

The thickness of the spacing member sheet is preferably 0.03 mm or more, more preferably 0.04 mm or more, and further preferably 0.05 mm or more. The thickness of the spacing member sheet is preferably 0.2 mm or less, more preferably 0.15 mm or less, and even more preferably 0.12 mm or less. By setting the thickness of the spacing member sheet within the above range, it is possible to obtain a spacing member sheet that is lightweight but has excellent mechanical strength. Further, by setting the thickness of the spacing member sheet within the above range, the number of laminated stages of the spacing members in the total heat exchange element can be increased, and the heat exchange efficiency can be further improved. The thickness of the spacing member sheet is measured in accordance with JIS P 8118 (2014).

(Sheet for partition member)
The partition member sheet contains cellulose fiber as a main component. Here, the "main component" means a component having a ratio of 50% by mass or more to the total mass of the partition member sheet. The partition member sheet is preferably composed of pulp containing cellulose fibers. Examples of the pulp containing the cellulose fiber include the above-mentioned pulp.

The partition member sheet may further contain fibers other than the cellulose fibers. Examples of other fibers include synthetic fibers such as rayon fiber, polyethylene fiber, polypropylene fiber and polyester fiber.

The partition member sheet preferably contains a hygroscopic agent. As the hygroscopic agent, the above-mentioned hygroscopic agent can be exemplified. Since calcium chloride and magnesium chloride have flame retardancy, when one or more of these hygroscopic agents are retained, the flame retardancy of the partition member sheet can be enhanced.

The content of the hygroscopic agent in the partition member sheet is preferably 1 g or more, more preferably 2 g or more, and further preferably 3 g or more per 1 m ² of the partition member sheet. The content of the hygroscopic agent in the partition member sheet is preferably 10 g or less, more preferably 9 g or less, and further preferably 8 g or less per 1 m ² of the partition member sheet. The content of the hygroscopic agent in the above-mentioned partition member sheet is an anhydrous equivalent amount. By setting the content of the hygroscopic agent within the above range, it is possible to more effectively suppress the generation of dew condensation water on the partition member in the total heat exchange element.

The partition member sheet may contain an arbitrary component as long as the effect of the present invention is not impaired. Examples of the optional component include a sizing agent, a paper strength enhancer, a colorant, a humidity control agent, a fungicide, a surfactant, a flame retardant, a polymer resin and the like. The optional component may be in a state of being attached to the surface of the partition member sheet, or may be in a state of being inserted into the gaps between the fibers of the partition member sheet.

The basis weight of the partition member sheet is preferably 10 g / m ² or more, and more preferably 15 g / m ² or more. The basis weight of the partition member sheet is preferably 70 g / m ² or less, and more preferably 40 g / m ² or less. By setting the basis weight of the partition member sheet within the above range, the thermal conductivity can be increased and the heat exchange efficiency can be improved. Further, by setting the basis weight of the partition member sheet within the above range, water retention can be enhanced, so that the generation of dew condensation water can be suppressed more effectively. The basis weight of the partition member sheet is measured in accordance with JIS P 8124 (2011).

The thickness of the partition member sheet is preferably 0.008 mm or more, more preferably 0.01 mm or more. The thickness of the partition member sheet is preferably 0.05 mm or less, more preferably 0.03 mm or less. By setting the thickness of the partition member sheet within the above range, it is possible to obtain a partition member sheet that is lightweight but has excellent mechanical strength. Further, by setting the thickness of the partition member sheet within the above range, the number of laminated stages of the partition member in the total heat exchange element can be increased, and the heat exchange efficiency can be further improved. The thickness of the partition member sheet is measured in accordance with JIS P 8118 (2014).

The air permeability of the partition member sheet is preferably 5000 seconds or longer. When the air permeability is 5000 seconds or more, the gas barrier property of the partition member is improved.

The partition member sheet may have a coating layer containing a polymer resin on one side or both sides of the paper base material in order to improve the gas barrier property. In this case, examples of the polymer resin include polyvinyl alcohol (PVA). The coating layer is formed by applying a coating liquid containing a polymer resin to a partition member sheet and drying it. The partition member sheet may be porous, in which case at least a portion of the coating layer is present in the gaps between the fibers below the surface of the partition member sheet. Further, a part of the coating layer may be present on the surface of the partition member sheet.

(Manufacturing method of sheet for spacing member)
The spacing member sheet is manufactured by applying or impregnating a paper base material (base paper for spacing member sheet) with a solution (chemical solution) containing a hygroscopic agent and a surfactant. The above-mentioned optional components may be added to the solution (chemical solution), if necessary. When preparing a solution (chemical solution), it is preferable to add 0.01 to 10 parts by mass of the surfactant to 100 parts by mass of the hygroscopic agent. By blending a surfactant, it is possible to more effectively suppress the generation of dew condensation water on the interval members in the total heat exchange element. Further, by blending the surfactant, the absorbent can be efficiently adhered to the sheet for the spacing member.

The paper substrate can be produced by making a papermaking material containing cellulose fibers. The papermaking raw material may contain other fibers and internal chemicals, if necessary. As a papermaking method for papermaking raw materials, a known method can be appropriately adopted.

The application or impregnation of a solution (chemical solution) containing a hygroscopic agent and a surfactant can be carried out by a known method. For example, after papermaking and drying the papermaking raw material with a paper machine, a solution (chemical solution) is applied in-line to the paper substrate using a coating device (size press, gate roll coater, rod coater, blade coater, etc.) in the paper machine. , May be dried. Alternatively, after the paper substrate is made and dried, a solution (chemical solution) is applied or impregnated offline to the paper substrate using a coating device or an impregnating device provided separately from the paper machine, and then dried. good.

The coating amount or impregnation amount of the solution (chemical solution) is preferably set so that the content of the hygroscopic agent and the surfactant in the obtained sheet for the spacing member is within a preferable range. For example, the coating amount or impregnation amount of the solution (chemical solution) is preferably 10 g / m ² or more, more preferably 20 g / m ² or more, and further preferably 30 g / m ² or more. The coating amount or impregnation amount of the solution (chemical solution) is preferably 50 g / m ² or less.

After the solution (chemical solution) is applied and dried, the obtained sheet for the interval member may be subjected to calendar treatment. By applying the calendar processing, the density of the sheet for the interval member is improved and the thickness is reduced. By increasing the density of the spacing member sheet, the gas barrier property is improved, and by reducing the thickness of the spacing member sheet, the thermal conductivity is improved and the heat exchange efficiency is improved. The calendar equipment used for the calendar processing is not particularly limited, and for example, known equipment such as a machine calendar, a soft nip calendar, a super calendar, and a gloss calendar can be appropriately used.

The method for manufacturing the partition member sheet is not particularly limited, but it can be obtained by applying a hygroscopic agent to paper using highly beaten pulp such as glassine paper, impregnating it, and then drying it.

Hereinafter, the features of the present invention will be described in more detail with reference to Examples and Comparative Examples. The materials, amounts used, ratios, treatment contents, treatment procedures, etc. shown in the following examples can be appropriately changed as long as they do not deviate from the gist of the present invention. Therefore, the scope of the present invention should not be construed as limiting by the specific examples shown below.

(Example 1)
30 parts by mass of calcium chloride (calcium chloride dihydrate, manufactured by Tokuyama Co., Ltd.), 0.1% by mass of surfactant A (nonionic surfactant (SN Wet 985, manufactured by Sannopco)) and 70 parts by mass of water SUS. It was placed in a manufacturing container and mixed. The base paper for the spacing member sheet was dipped in the mixed solution (chemical solution), and the base paper was impregnated with the chemical solution. Then, using a mangle, the excess liquid impregnated in the base paper was squeezed and dried in a drying oven at 105 ° C. to obtain a sheet for an interval member. As the base paper for the sheet for the spacing member, bleached kraft paper (manufactured by Oji Materia, basis weight 60 g / m ² , 130 × 130 mm) was used.

(Examples 2 to 6 and Comparative Example 1)
A sheet for an interval member was obtained in the same manner as in Example 1 except that the composition of the chemical solution was changed as shown in Table 1. As the surfactant B, a nonionic surfactant (Benatar NS8, manufactured by Kotani Chemical Co., Ltd.) was used.

(Measurement and evaluation)
(Amount of chemical impregnation)
The amount of the chemical solution impregnated in the spacing member sheet obtained in Examples and Comparative Examples was calculated by the difference in mass between before and after the chemical solution impregnation. The content of the hygroscopic agent is a value in terms of anhydrous calcium chloride.

(Cobb water absorption)
The Cobb water absorption of the spacing member sheet was measured according to JIS P 8140. The contact time was 30 seconds.

(Hygroscopicity)
The sheets for spacing members obtained in Examples and Comparative Examples were placed under the conditions of 23 ° C. and 50% relative humidity for 24 hours, and after adjusting the humidity, they were placed in a weighing bottle (with a lid) and dried at 105 ° C. for 1 hour. , The absolute dry mass (A) was measured. Then, it was placed in a constant temperature and humidity chamber at 20 ° C. and a relative humidity of 65% for 3 hours, and the humidity control mass (B) was measured. Then, the hygroscopicity (%) was calculated by the following formula.
Hygroscopicity (%) = (BA) / A × 100

(Evaluation of condensation occurrence (sheet))
The sheets for spacing members obtained in Examples and Comparative Examples were suspended in a constant temperature and humidity chamber at 40 ° C. and a relative humidity of 95% for 1 hour. Then, the degree of water droplet generation generated on the surface of the spacing member sheet was visually evaluated.
○: No dew condensation has occurred ×: Condensation has occurred

(Example 7)
A chemical solution was obtained in the same manner as in Example 1 except that the blending amount of the chemical solution was changed as shown in Table 2. This chemical solution was supplied to the impregnation coating machine, and the base paper for the sheet for the interval member was impregnated and coated. Then, it was dried in a drying oven at 105 ° C. to obtain a sheet for an interval member.

(Comparative Examples 2 and 3)
A sheet for an interval member was obtained in the same manner as in Example 7 except that the blending amount of the chemical solution was changed as shown in Table 2.

(Evaluation: Evaluation of dew condensation (bonded product))
Regarding the sheets for spacing members obtained in Example 7, Comparative Examples 2 and 3, in addition to the above evaluation items, the state of dew condensation when they were bonded was evaluated. The bonded product was prepared as follows. First, the sheet for spacing members was folded into pleats at a pitch of 4 mm to form a pseudo-honeycomb. Next, the mountain-folded portion of the pseudo-honeycomb structure was bonded to the partition member obtained by impregnating glassine paper with calcium chloride using an adhesive (EVA) to obtain a one-step sheet (bonded product) for evaluation. ..
This single-stage sheet (bonded product) for evaluation was suspended in a constant temperature and humidity chamber at 40 ° C. and a relative humidity of 95% for 24 hours. Then, the degree of water droplet generation generated on the one-stage sheet surface was visually evaluated.
○: No dew condensation has occurred ×: Condensation has occurred

In the examples as compared with the comparative examples, the hygroscopicity was not inhibited and the water retention was enhanced, and as a result, the occurrence of dew condensation was suppressed. Further, when Example 7 and Comparative Examples 2 and 3 were compared, it was found that when the surfactant was added, the amount of calcium chloride adhered was increased even if the concentration of calcium chloride in the impregnating solution was low.

1 Partition member 2 Spacing member 4 First air flow path 5 Second air flow path 10 Total heat exchange element

Claims (7)

For a total heat exchange element used in a total heat exchange element including a plurality of partition members and a plurality of interval members that form an air flow path between the plurality of partition members and maintain a distance between the partition members. It is a sheet for spacing members,
Contains cellulose fiber as the main component,
A sheet for spacing members further comprising a hygroscopic agent and a surfactant. The sheet for an interval member according to claim 1, wherein the Cobb water absorption is 30 to 100 g / m ² . The sheet for an interval member according to claim 1 or 2, wherein the hygroscopic agent is at least one selected from the group consisting of calcium chloride and lithium chloride. The spacing member sheet according to any one of claims 1 to 3, wherein the content of the hygroscopic agent is 2 to 30 g per 1 m ² of the spacing member sheet. The sheet for a spacing member according to any one of claims 1 to 4, wherein the surfactant is a nonionic surfactant. The method for manufacturing a sheet for an interval member according to any one of claims 1 to 5.
For sheets containing cellulose fiber as the main component,
A method for producing a sheet for a spacing member, which comprises applying or impregnating a solution containing a hygroscopic agent and a surfactant. A total heat exchange element comprising a plurality of spacing members made of the spacing member sheet according to any one of claims 1 to 5 and a plurality of partitioning members.
The spacing member is a total heat exchange element that forms an air flow path between the plurality of partitioning members and maintains the spacing between the partitioning members.

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