JP4555328B2 - Total heat exchange element paper - Google Patents

Description

  The present invention provides a total heat exchange element used for an element of a total heat exchanger that exchanges sensible heat (temperature) and latent heat (humidity) when supplying fresh outside air and discharging dirty air in the room. The present invention relates to a total heat exchange element sheet having good heat exchange characteristics and low mixing of supply and exhaust, and a total heat exchange element using the sheet.

  In an air-to-air heat exchanger that supplies fresh outside air and performs heat exchange when exhausting dirty air in the room, a total heat exchanger that also performs heat exchange of latent heat (humidity) as well as sensible heat (temperature) Since the element needs to have both heat conductivity and moisture permeability, paper mainly composed of natural pulp is used in many cases.

  However, the conventional total heat exchange element paper has heat conductivity and moisture permeability, but on the other hand, since it uses a porous base material, it also has air permeability of dirty gas components such as carbon dioxide, and thus the total heat At the time of replacement, the supply air and the exhaust gas are mixed inside the element, and the ventilation efficiency is reduced. This mixing of supply air and exhaust is a fatal critical defect when considering a product called a total heat exchanger, and in order to mix supply air and exhaust, the air inside and outside is exchanged while recovering energy. Rather than simply, it can be evaluated that the dirty air in the room is simply being stirred while referring to heat recovery. No matter how high the heat transfer is, or even if the moisture permeability is high, the indoor / outdoor air cannot be used as a ventilator, and as a matter of course, the fan performs 100% heat recovery and humidity recovery. Even the comparison that it is possible holds. Naturally, the fan does not have any ventilation function, and the difference between the total heat exchanger, which is a high-class ventilation fan, and the fan is exchanged without mixing the indoor and outdoor air while exchanging heat, in other words One point is to exhaust air from the room and supply air from the outside. The value of the total heat exchanger as a product depends primarily on this function of ventilation, so that the merchantability is fundamentally suspected if mixing of supply and exhaust occurs.

  Various studies have been made to avoid this serious problem of mixing of air supply and exhaust. However, even though the total heat exchange element paper so far has heat conductivity and moisture permeability, it is basically gas. The current situation is that the shielding property is not sufficient, and in fact, air supply and exhaust are mixed considerably inside the element. This insufficiency of gas shielding requires the use of a paper (cellulose) base material in order to impart moisture permeability to the total heat exchange element paper, and if it is intended to further improve the moisture permeability, the total heat exchange element paper This is because there is a dilemma that becomes porous and increases air permeability (decrease in gas shielding properties). If moisture permeation is not required for all heat exchange element paper, it is not a porous substrate such as paper, but a plastic film that can be made thinner and has a high gas shielding property, and aluminum foil that is used in many heat exchange media However, since such a material has almost no moisture permeability, even if it can exchange heat, it cannot exchange humidity and cannot be used as a total heat exchange element sheet.

  Accordingly, an object of the present invention is to improve gas shielding while maintaining high moisture permeability and heat exchange in a total heat exchange element sheet for constituting an element for a total heat exchanger, and to mix air supply and exhaust inside the element. It is to reduce. That is, an object of the present invention is to provide an excellent total heat exchange element paper and a total heat exchange element that satisfy all of heat transfer properties, moisture permeability, and gas shielding properties.

  As a result of intensive studies to solve the above problems, the present inventors have invented the following total heat exchange element paper and a total heat exchange element using the same.

(1) Total heat exchange element paper made of paper containing natural pulp beaten to 150 ml or less with Canadian modified freeness as defined below.
Canadian Modified Freeness: Value measured according to the Canadian Standard Freeness Test Method of JIS P 8121, except that 0.5g of pulp was collected by dry-drying and the sieve plate was made into 80 mesh plain weave bronze wire. .
(2) The total heat exchange element paper according to (1), further containing a hygroscopic agent.
(3) The total heat exchange element paper according to (1) having a density of 0.9 g / cm ³ or more.
(4) The total heat exchange element paper of (2) having a density of 0.9 g / cm ³ or more.
(5) A nonporous total heat exchange element paper comprising a substantially nonporous cellulosic base material and a hygroscopic agent contained in the base material.
(6) The thickness is 100 μm or less, and the carbon dioxide permeability coefficient specified in JIS K 7126 method A (differential pressure method) is 5.0 × 10 ⁻¹³ mol · m / m ² · s · Pa or less. (5) Nonporous total heat exchange element paper.
(7) The nonporous total heat exchange element paper according to (5), wherein the moisture permeability at 20 ° C. and 65% RH specified by JIS Z 0208 is 1000 g / m ² · 24 Hr or more.
(8) The nonporous total heat exchange element paper according to (6), wherein the moisture permeability at 20 ° C. and 65% RH specified by JIS Z 0208 is 1000 g / m ² · 24 Hr or more.
(9) The nonporous total heat exchange element paper according to (5), wherein the base material has a thickness of 8 μm to 50 μm and is selected from the group consisting of condenser paper, tracing paper, or glassine paper.
(10) The nonporous total heat exchange element paper according to (6), wherein the base material has a thickness of 8 μm to 50 μm and is selected from the group consisting of condenser paper, tracing paper, or glassine paper.
(11) The nonporous total heat exchange element paper according to (7), wherein the base material has a thickness of 8 μm to 50 μm and is selected from the group consisting of condenser paper, tracing paper, or glassine paper.
(12) The nonporous total heat exchange element paper according to (8), wherein the base material has a thickness of 8 μm to 50 μm and is selected from the group consisting of condenser paper, tracing paper, or glassine paper.
(13) A total heat exchange element using the total heat exchange element paper of (1).
(14) A total heat exchange element using the total heat exchange element paper of (2).
(15) A total heat exchange element using the total heat exchange element paper of (3).
(16) A total heat exchange element using the total heat exchange element paper of (4).
(17) A total heat exchange element using the total heat exchange element paper of (5).
(18) A total heat exchange element using the total heat exchange element paper of (6).
(19) A total heat exchange element using the total heat exchange element paper of (7).
(20) A total heat exchange element using the total heat exchange element paper of (8).
(21) A total heat exchange element using the total heat exchange element paper of (9).
(22) A total heat exchange element using the total heat exchange element paper of (10).
(23) A total heat exchange element using the total heat exchange element paper of (11).
(24) A total heat exchange element using the total heat exchange element paper of (12).

  Hereinafter, the total heat exchange element sheet of the present invention will be described in detail.

  In the present invention, the total heat exchange element paper constituting the total heat exchange element constitutes a so-called partition plate part in the corrugated type, and a part for exchanging heat and humidity in the plastic frame built-in type and paper embossed type. Refers to paper. The total heat exchange element is a total heat exchange element manufactured using the total heat exchange element paper of the present invention as a partition plate, or a total heat produced by embedding a plastic frame or embossing the total heat exchange element paper. It refers to an exchange element.

  First, the first aspect of the present invention will be described.

  The material constituting the total heat exchange element paper of the present invention is manufactured mainly from the same cellulosic base material as that of general fine paper, but the total heat exchange element paper of the above (1) is Canadian modified filtered water. Less than 150 ml at a degree (value measured according to JIS P 8121 Canadian Standard Freeness Test Method, except that 0.5 g of pulp was collected by dry drying and the sieve plate was made of 80 mesh plain weave bronze wire) By using paper made from beaten natural pulp as the main component for the total heat exchange element paper, it will have excellent heat transfer, moisture permeability, and gas shielding, and will produce excellent mixing of air and exhaust. I found.

  When paper made from natural pulp beaten to a Canadian modified freeness of greater than 150 ml is used as the main component, it becomes paper with inferior gas-shielding properties, or when trying to supplement it, moisture permeability is insufficient and heat exchange performance is inferior. It becomes paper and an excellent total heat exchange element paper cannot be obtained.

  Moreover, it is preferable to contain a hygroscopic agent in the total heat exchange element paper of the present invention. When the hygroscopic agent is contained in the total heat exchange element paper of the present invention, the hygroscopicity is synergistically improved, and a more excellent total heat exchange element paper can be obtained.

  The pulp mainly used for the total heat exchange element paper of the present invention is actually lower than the lower limit value measurable by the Canadian standard freeness test method, and is highly beaten to an area where it cannot be measured. Therefore, as a means of measuring the freeness of pulp that has been beaten to an area that cannot be measured by the Canadian Standard Freeness Test Method, 0.5 g of pulp is completely dried and the sieve plate is a 80 mesh plain weave bronze wire. Except for the above, the freeness of the pulp is measured by the Canadian modified freeness test method, which is measured according to the Canadian standard freeness test method of JIS P 8121.

Density is preferably 0.9 g / cm ³ or more from the viewpoint of gas shielding of the entire heat exchange element sheets of the present invention, still preferably a 1.0 g / cm ³ or more.

  Next, the second aspect of the present invention will be described.

  The material constituting the total heat exchange element paper of the present invention is manufactured mainly on the same cellulosic base material as general high-quality paper, and the difference from ordinary paper and conventional total heat exchange element paper is porous. In other words, a substantially nonporous base material is used instead of the base material.

The category of substantially non-porous in the total heat exchange element paper in the above (5) is, for example, a carbon dioxide permeability coefficient defined by JIS K 7126 of 5.0 × 10 ⁻¹³ mol · m in terms of a membrane test method. / M ² · s · Pa or less should be an essential condition. This carbon dioxide permeability coefficient guarantees a gas shielding property of several hundred times or more compared with ordinary so-called general paper or paper called porous substrate. For example, carbon dioxide which is a component of dirty air That hardly penetrates the total heat exchange element paper used as the partition plate satisfies the requirement that the supply air and the exhaust gas are not mixed in the ventilation system of the total heat exchange element.

  In general, when the gas permeability coefficient is high, not only gas (water vapor, carbon dioxide) easily passes but also heat easily passes. This tendency can be easily understood by considering a porous substrate rather than the concept of a membrane. That is, the material that penetrates the hole easily passes carbon dioxide and other gases, water vapor, and heat through the hole as the air moves. The point that it is easy to pass water vapor and heat satisfies the two major characteristics of the total heat exchange element paper, and is a very acceptable characteristic in the design of the total heat exchanger. We focused on the point that it should be easy to pass only water vapor and heat, and to make it difficult for carbon dioxide (representative examples of dirty air components, other gases such as ammonia and formaldehyde) to pass through. In that case, the design concept of the partition plate (total heat exchange element paper) should never be a porous base material that has perforated holes in order to make the movement of carbon dioxide almost zero. Must be nonporous with few pores in the direction. Furthermore, since moisture (or water vapor) must be moved in the cross-sectional direction of the paper, the metal foil or plastic sheet has insufficient water movement, and water molecules in the cross-sectional direction of the paper are required to secure the water movement. It is necessary to have a large amount of functional groups (for example, a hydroxyl group, a carboxylic acid group, or a carboxylic acid salt) having a high affinity. Candidates for such paper may be based on compounds with high water affinity, such as cellulose, polyvinyl alcohol, polyether, polyacrylic acid and their salts. Cellulosic base materials are most suitable in terms of ease of securing.

  In order to facilitate the movement of moisture in the paper cross-sectional direction (thickness direction), the nonporous total heat exchange element paper can be manufactured by mixing a moisture absorbing material. When the total heat exchange element paper of the present invention contains a hygroscopic agent, the hygroscopic property of the hygroscopic agent and the functional group having high water affinity of the molecules constituting the base material (for example, cellulose) act synergistically, and more excellent total Heat exchange element paper can be obtained. As the hygroscopic agent, any of generally known halides, oxides, salts, hydroxides and the like can be used, but it is particularly preferable to use lithium chloride, calcium chloride, phosphate, etc. because of good hygroscopic performance. . Some of these compounds have a flame retardant effect, and include cases where they are mixed to impart flame retardancy to a substrate.

The nonporous total heat exchange element paper of the present invention has a thickness of 100 μm or less, and a carbon dioxide permeability coefficient specified in JIS K 7126 of 5.0 × 10 ⁻¹³ mol · m / m ² · s · Pa. It is characterized by the following. Of course, the gas permeability coefficient of carbon dioxide or the like is an index that expresses the selective permeability of the gas inherent to the molecular structure of the polymer base material, so that it does not involve thickness as can be seen from the unit system. Since the actual gas permeation amount is inversely proportional to the thickness of the base material used, if the total carbon dioxide permeation amount is reduced, the thicker the total heat exchange element paper, the higher the shielding property. However, since the total heat exchange element sheet becomes thicker and the water vapor permeability decreases, the function as the total heat exchange element cannot be satisfied. Therefore, it is necessary to have a thickness that does not impair the heat exchange property, and the regulation in the above (6) is that the carbon dioxide permeability defined in JIS K 7126 is 5.0 × 10 ⁻⁹ under the condition that the thickness is 100 μm or less. It is synonymous with mol / m ² · s · Pa or less. If it is thicker than 100 μm, the essential heat exchange properties deteriorate, and even if it is too thin, the possibility of structural defects and pinholes during processing increases, and the gas shielding performance decreases, and carbon dioxide permeation occurs. Detrimental effects such as an increase in the coefficient become significant and deviate from the purpose of total heat exchange. However, the lower limit of the thickness was omitted because it can be defined by the upper limit of the carbon dioxide permeability coefficient.

The total heat exchange element paper of the present invention needs to be substantially nonporous. Although there is no clear definition as to whether the total heat exchange element paper is nonporous or porous in the thickness direction, in this specification, the thickness is 100 μm or less, and the carbon dioxide permeability coefficient defined in JIS K 7126 is The standard is 5.0 × 10 ⁻¹³ mol · m / m ² · s · Pa or less. As described above, this value is synonymous with a carbon dioxide permeability of 5.0 × 10 ⁻⁹ mol / m ² · s · Pa or less. Since the carbon dioxide permeation coefficient of the porous total heat exchange element paper generally known so far is several hundred to several tens of thousands times this value, the total heat exchange element paper of the present invention has the total heat of the past. Obviously, this is far from the concept of exchange element paper.

Furthermore, the total heat exchange element paper of the present invention has a characteristic of high enthalpy exchangeability, with a moisture permeability of 20% at 65% RH defined by JIS Z 0208 of 1000 g / m ² · 24 Hr or more. It is merely a characteristic that it is non-porous, has a thickness of 100 μm or less, and has a carbon dioxide permeability coefficient specified by JIS K 7126 of 5.0 × 10 ⁻¹³ mol · m / m ² · s · Pa or less. If so, it can be achieved even with a simple polyethylene film or polyester film. The major characteristic of the total heat exchange element paper of the present invention is comparable to the water vapor permeability of the total heat exchange element paper in which conventional gas passes through the skirt while having gas shielding performance comparable to that of a plastic film. It has moderate moisture permeability. This is based on the concept of a selective gas permeable membrane that promotes only moisture permeation while preventing permeation of all gases.

  Furthermore, the third aspect of the present invention will be described.

  In the present invention, a nonporous total heat exchange element paper in which a moisture absorbent is contained in a condenser paper, tracing paper or glassine paper having a thickness of 8 μm to 50 μm is preferable.

The material of the condenser paper, tracing paper, or glassine paper constituting the total heat exchange element paper of the present invention is manufactured mainly on the same cellulosic base material as general high-quality paper. The difference from total heat exchange element paper is not to use a porous base material, but to use a capacitor paper, tracing paper, or glassine paper base material made substantially nonporous. is there. The category of substantially non-porous is one criterion that the carbon dioxide permeability coefficient specified in the membrane test method JIS K 7126 is 5.0 × 10 ⁻¹³ mol · m / m ² · s · Pa or less. This carbon dioxide permeability coefficient guarantees a gas shielding property of several hundred times or more compared to ordinary so-called general paper or paper called a porous substrate. This shielding property means that, for example, carbon dioxide, which is a component of dirty air, hardly permeates the total heat exchange element paper used as the partition plate, and the requirement that the supply air and the exhaust gas do not mix in the ventilation system of the total heat exchange element It satisfies.

  In general, when the gas permeability coefficient is high, not only gas (water vapor, carbon dioxide) easily passes but also heat easily passes. This tendency can be easily understood by considering a porous substrate rather than the concept of a membrane. That is, the material that penetrates the hole easily passes carbon dioxide and other gases, water vapor, and heat through the hole as the air moves. The point that it is easy to pass water vapor and heat satisfies the two major characteristics of the total heat exchange element paper, and is a very acceptable characteristic in the design of the total heat exchanger. Returning to the starting point of being an exchangeable ventilation fan, it is easy to pass only water vapor (latent heat) and heat (sensible heat), and carbon dioxide (representative examples of dirty air components, the same applies to other gases such as ammonia and formaldehyde). We focused on the point that it should be difficult. In that case, the design concept of the partition plate (total heat exchange element paper) should never be a porous base material that has perforated holes in order to make the movement of carbon dioxide almost zero. Must be nonporous with few pores in the direction. Furthermore, since moisture (or water vapor) must be moved in the cross-sectional direction of the paper, the metal foil or plastic sheet has insufficient water movement, and water molecules in the cross-sectional direction of the paper are required to secure the water movement. It is necessary that a large amount of functional groups (for example, a hydroxyl group, a carboxylic acid group, or a carboxylic acid salt) having a high affinity with be present. Candidates for such paper may be based on compounds with high water affinity, such as cellulose, polyvinyl alcohol, polyether, polyacrylic acid and their salts. Cellulosic base materials are most suitable in terms of ease of securing. In the present invention, it is preferable that non-porous condenser paper, tracing paper or glassine paper having a certain thickness is used as a base material among papers using a cellulose base material.

  In order to facilitate the movement of moisture in the paper cross-sectional direction (thickness direction), the nonporous condenser paper, tracing paper, or glassine paper type total heat exchange element paper can be manufactured by mixing a moisture absorbent. it can. When a hygroscopic agent is contained in the total heat exchange element paper of the present invention, the hygroscopic property of the hygroscopic agent and the functional group having high water affinity of the molecule (cellulose) constituting the base material act synergistically, resulting in a more excellent total heat Exchangeable element paper can be obtained.

  The condenser paper type, tracing paper type or glassine paper type nonporous total heat exchange element paper of the present invention is characterized in that it has a thickness of 8 μm to 50 μm. If the thickness is smaller than this, the probability of pinholes increases and mixing of air supply and exhaust tends to occur, which is not preferable as a total heat exchange element sheet. If the thickness is larger than this, the heat exchange property and humidity permeability are lowered, which is also not preferable for the total heat exchange element paper.

The total heat exchange element paper of the present invention needs to be substantially nonporous. There is no clear definition as to whether the total heat exchange element paper is nonporous or porous in the thickness direction, but when taking a cross-sectional enlarged picture of the paper, it is judged by whether or not there are clearly holes in the thickness direction It is also possible to use a gas permeability coefficient such as carbon dioxide as a guide. Since condenser paper, tracing paper or glassine paper is also required to be pinhole free, the carbon dioxide permeability coefficient specified in JIS K 7126 is 5.0 × 10 ⁻¹³ mol · m / m ² · s ·. It becomes a standard that it is Pa or less. It is easy to distinguish the porous paper because it is 100 times or more the transmission coefficient.

  The total heat exchange element paper of the present invention has characteristics of high heat conductivity, high humidity exchange, and very low enthalpy exchange because of less leakage. A simple polyethylene film or polyester film can be achieved if it is merely nonporous, has a thickness of 50 μm or less, and has a carbon dioxide permeability coefficient of a certain value or less. The major characteristic of the total heat exchange element paper of the present invention is comparable to the water vapor permeability of the conventional total heat exchange element paper in which the gas passes through the skirt while having gas shielding performance comparable to that of a plastic film. It has moderate moisture permeability. This is based on the concept of a selective gas permeable membrane that promotes only moisture permeation while preventing permeation of all gases.

  The capacitor paper used in the present invention is generally used for electrical insulation paper, and the types thereof are communication paper insulation paper, transformer insulation paper, winding insulation paper, craft insulation paper, modified craft insulation paper, etc. Can be mentioned. Main applications include communication capacitors, power capacitors, and power cable capacitors. The main component is cellulose, but those containing vinylon or those containing cotton can also be used.

In its structural method, high-quality pulp is beaten, paper-made, supercalendered, uniform in thickness, free from wrinkles, unevenness in production, pinholes, tears, etc. Finished into porous paper. Density 0.8 g / cm ³ or higher, preferably 0.9 g / cm ³ or more, paper taking into account the structural efficiency 0.9g ^/ cm ³ ~1.27g ^/ cm 3 approximately dense nonporous It is preferable to be structured. In the case of the use of the present invention, a hygroscopic agent can be treated and used.

The tracing paper used in the present invention is generally used for second original drawing paper such as positive photosensitive paper, drafting paper, decorative paper, etc., and its writing property, erasability, transparency, copying property, toner Paper that takes account of acceptability and strength. There are two types of tracing paper: general tracing paper (natural tracing paper) made of pulp mainly composed of NBKP, which has been beaten, and impregnated tracing paper with increased transparency by resin impregnation. The tracing paper used in the paper mainly refers to the former, and usually has a density of 0.8 g / cm ³ or more, preferably 0.9 g / cm ³ or more, and 0.9 g / cm ³ in consideration of production efficiency. It is preferable to produce a non-porous paper having a high density of about ^{3 to} 1.27 g / cm ³ . In the case of the use of the present invention, a hygroscopic agent can be treated and used.

  The glassine paper used in the present invention is used for food packaging, pharmaceutical packaging, punched cups for cakes, decorations, etc., oil resistance, transparency, moisture permeability compared to general paper Etc.

As an example of the method for producing glassine paper in the present invention, natural pulp such as chemical pulp is extremely beaten and made into paper, humidified so that the water content becomes 25%, and calendered to increase the density. At the same time, it is manufactured by extruding bubbles in the paper layer to eliminate pinholes and increasing transparency. The density of the paper, 0.8 g / cm ³ or higher, preferably 0.9 g / cm ³ or more, and put the production efficiency into account 0.9g ^/ cm ³ ~1.27g ^/ cm 3 order of high density free It is preferably manufactured on porous paper. In the case of the use of the present invention, a hygroscopic agent can be treated and used.

  Hereinafter, the first to third aspects of the present invention will be further described.

  As the hygroscopic agent used in the present invention, any of the generally known halides, oxides, salts, hydroxides and the like can be used. However, the use of lithium chloride, calcium chloride, phosphate, etc. improves the hygroscopic performance. It is particularly preferable because it is good. Some of these compounds have an effect of flame retardancy, and include cases where they are mixed to impart flame retardancy to paper. The amount of the hygroscopic agent itself varies depending on the thickness of the non-porous condenser paper, tracing paper, or glassine paper, so it cannot be numerically limited. Generally, the more the hygroscopic agent, the more the total heat exchange element. The moisture permeability as a paper also tends to be improved.

  Examples of the material used as the natural pulp or cellulose base material mainly used for the total heat exchange element paper of the present invention include NBKP, LBKP, NBSP, LBSP, NUKP and the like. They may be used alone or in combination according to the purpose. In addition, non-wood pulp such as cotton fiber, bast fiber, bagasse and hemp can be used as necessary. The ratio at the time of mixing can be suitably changed according to the purpose. Furthermore, a small amount of thermoplastic synthetic fiber can be used to increase the strength and moldability.

  The pulp in the present invention is beaten by a beating machine such as a double disc refiner, a deluxe finner, or a Jordan until internal fibrillation and external fibrillation occur, and then paper is made.

  In making paper, a small amount of a wet strength agent can be added to increase the wet strength, and an internal sizing agent can be added to increase the paper strength.

  When making paper using the beaten pulp in the present invention, a paper machine such as a long net, a round net, a twin wire, an on-top, and a hybrid can be used. In addition, supercalendering and thermal calendering after paper making is also preferable because it improves the uniformity of the paper.

  The structure of the total heat exchange element in the present invention is not limited as long as the paper obtained as described above is used as a heat exchange medium. In the case of a corrugated structure which is a typical total heat exchange element structure, the liner sheet uses the total heat exchange element paper of the present invention, and is laminated so that the wave directions of the core sheet alternately intersect. .

  Hereinafter, the present invention will be described in detail according to examples. In addition, this invention is not limited to an Example. In the following, all parts and% are by mass. Moreover, the value which shows a coating amount is the mass after drying unless there is a notice.

(1) First side example 1
Softwood bleached kraft pulp (NBKP) was disaggregated at a concentration of 3%, and then beaten using a double disc refiner and a deluxe refiner until the Canadian modified freeness of the pulp reached 100 ml. Thereafter, a total heat exchange element paper having a basis weight of 40 g / m ² was produced by a long web paper machine. In the size press, 1 g / m ^{2 of} lithium chloride was applied, and then machine calendering was performed so that the density was 0.9 g / cm ³ .

Example 2
In Example 1, a total heat exchange element paper was obtained in the same manner except that the Canadian modified freeness of pulp was changed to 150 ml.

Example 3
In Example 1, a total heat exchange element paper was obtained in the same manner except that the Canadian modified freeness of pulp was changed to 50 ml.

Example 4
Except that diammonium phosphate was used instead of lithium chloride in Example 1, all heat exchange element sheets were obtained by the same method.

Example 5
In Example 1, a total heat exchange element paper was obtained in the same manner except that 0.1 g / m ^{2 of} starch was used instead of lithium chloride.

Example 6
In Example 1, all heat exchange element sheets were obtained by the same method except that the machine calendar process was performed so that the density was 0.8 g / cm ³ .

Example 7
In Example 1, a total heat exchange element paper was obtained in the same manner except that the Canadian modified freeness of pulp was changed to 200 ml.

  The total heat exchange element paper produced in the above example was evaluated by the following evaluation method. The results are summarized in Table 1.

(Canada modified freeness)
The Canadian modified freeness of pulp was measured in accordance with JIS P 8121's Canadian freeness test method, except that 0.5g of pulp was completely dried and the sieve plate was made of 80 mesh bronze wire. It is the value.

(Moisture permeability)
The sensible heat (humidity) exchangeability of the total heat exchange element paper was evaluated by moisture permeability. In JIS Z 0208, since the moisture permeability is large, the moisture permeability is 40 ° C. and 90% moisture permeability of all the heat exchange element papers, except that the moisture permeability is obtained by measuring the weight every hour.

(The amount of heat conduction)
The latent heat (temperature) exchangeability of the total heat exchange element paper was evaluated by the amount of heat conduction. It is a value measured by the QTM method (probe method improved from the hot wire method).

(Carbon dioxide permeability)
The gas shielding property of the total heat exchange element paper was evaluated by carbon dioxide permeability. This is a value obtained by measuring the carbon dioxide permeability in accordance with JIS K 7126 method A (differential pressure method). The transmittance of “10 ⁻⁷ or higher and impossible to measure” was displayed in this manner because the transmission was too fast to measure at 10 ⁻⁷ mol / m ² · s · Pa or higher.

<Evaluation>
From the results of Examples 1 to 7, it is apparent that the present invention is a total heat exchange element sheet having excellent heat transfer properties, moisture permeability, and gas shielding properties. On the other hand, when the Canadian modified freeness of the pulp is larger than 150 ml, the carbon dioxide permeability is increased, and it is clear that the paper has remarkably inferior gas shielding properties than those of the present invention. In addition, it is clear that when a hygroscopic agent is contained, the moisture permeability is increased synergistically without impairing other performances, and a paper with better heat exchange can be obtained. Further, it is well understood that the carbon dioxide permeability is reduced by setting the density to 0.9 g / cm ³ or more, which is preferable from the viewpoint of gas shielding properties.

(2) Second aspect Example 8
Softwood bleached kraft pulp (NBKP) was disaggregated at a concentration of 2.8% and then thoroughly beaten using a double disc refiner and a deluxe refiner. Thereafter, a base paper having a basis weight of 40 g / m ² was produced by a long web paper machine. In the manufacturing process, 5 g / m ^{2 of} diammonium phosphate solution was applied as a moisture absorbent and dried to obtain a total heat exchange element paper 1. This total heat exchange element paper is substantially non-porous, and the carbon dioxide permeability coefficient measured by JIS K 7126 method A (differential pressure method) is 5.0 × 10 ⁻¹³ mol · m / m ² · s · Pa. The thickness was 45 μm.

Example 9
In Example 8, a base paper having a basis weight of 40 g / m ² was produced in the same manner using a long paper machine after further thorough beating. In the manufacturing process, 5 g / m ^{2 of} diammonium phosphate solution was applied as a moisture absorbent and dried to obtain a total heat exchange element paper 2. This total heat exchange element paper is substantially nonporous, and the carbon dioxide permeability coefficient measured by JIS K 7126 method A (differential pressure method) is 5.0 × 10 ⁻¹⁴ mol · m / m ² · s ·. Pa. The thickness was 45 μm.

Example 10
A base paper was produced in the same manner as in Example 9 except that the basis weight was 20 g / m ² in Example 9. In the manufacturing process, 3 g / m ^{2 of a} diammonium phosphate solution was applied as a moisture absorbent and dried to obtain a total heat exchange element paper 3. This total heat exchange element paper is substantially nonporous, and the carbon dioxide permeability coefficient measured by JIS K 7126 method A (differential pressure method) is 5.0 × 10 ⁻¹⁴ mol · m / m ² · s ·. Pa.

Example 11
A base paper was produced in the same manner as in Example 9 except that the basis weight was 20 g / m ² in Example 9. In the manufacturing process, a diammonium phosphate solution and lithium chloride as a hygroscopic agent were applied in a total amount of 4 g / m ² and dried to obtain a total heat exchange element paper 4. This total heat exchange element paper is substantially nonporous, and the carbon dioxide permeability coefficient measured by JIS K 7126 method A (differential pressure method) is 5.0 × 10 ⁻¹⁴ mol · m / m ² · s ·. Pa. The thickness was 25μ.

Example 12
A base paper was produced in the same manner as in Example 9 except that the basis weight was 100 g / m ² in Example 9. In the manufacturing process, diammonium phosphate solution and lithium chloride as a hygroscopic agent were applied in a total amount of 10 g / m ² and dried to obtain a total heat exchange element paper 5. This total heat exchange element paper is substantially nonporous, and the carbon dioxide permeability coefficient measured by JIS K 7126 method A (differential pressure method) is 5.0 × 10 ⁻¹⁴ mol · m / m ² · s ·. The thickness at Pa was 110 μm.

Example 13
A base paper was produced in the same manner as in Example 12 except that the basis weight was 150 g / m ² in Example 12. In the manufacturing process, a total of 15 g / m ^{2 of} diammonium phosphate solution and lithium chloride as a moisture absorbent was applied and dried to obtain a total heat exchange element paper 6. This total heat exchange element paper is substantially nonporous, and the carbon dioxide permeability coefficient measured by JIS K 7126 method A (differential pressure method) is 5.0 × 10 ⁻¹⁴ mol · m / m ² · s ·. The thickness at Pa was 165 μm.

Example 14
A corrugated total heat exchange element was prepared using the total heat exchange element paper produced in Examples 8 to 13 as a partition plate and using high-quality paper of 75 g / m ^{2 for} the flute. There was no problem in production and it worked well.

Example 15
After softwood bleached kraft pulp (NBKP) was disaggregated at a concentration of 3%, it was beaten moderately using a double disc refiner. Thereafter, a base paper having a basis weight of 40 g / m ² was produced by a long web paper machine. In the manufacturing process, 5 g / m ^{2 of a} diammonium phosphate solution was applied as a moisture absorbent and dried to obtain a total heat exchange element paper 7. This total heat exchange element paper is substantially porous, and the carbon dioxide permeability measured by the method A (differential pressure method) of JIS K 7126 is 1.0 × 10 ⁻⁹ mol · m / m ² · s · Pa. Met. The thickness was 45 μm.

Example 16
A base paper was produced in the same manner as in Example 15 except that the basis weight was 20 g / m ² in Example 15. In the manufacturing process, 3 g / m ^{2 of a} diammonium phosphate solution was applied as a moisture absorbent and dried to obtain a total heat exchange element paper 8. This total heat exchange element paper is substantially porous, and the carbon dioxide permeability measured by the method A (differential pressure method) of JIS K 7126 is 1.0 × 10 ⁻⁹ mol · m / m ² · s · Pa. Met. The thickness was 25 μm.

Example 17
A base paper was produced in the same manner as in Example 15 except that the basis weight was 100 g / m ² in Example 15. In the manufacturing process, the diammonium phosphate solution and lithium chloride as a hygroscopic agent were applied in a total amount of 10 g / m ² and dried to obtain a total heat exchange element paper 9. This total heat exchange element paper is substantially porous, and the carbon dioxide permeability measured by the method A (differential pressure method) of JIS K 7126 is 1.0 × 10 ⁻⁹ mol · m / m ² · s · Pa. And the thickness was 115 μm.

Example 18
A base paper was produced in the same manner as in Example 15 except that the basis weight was 100 g / m ² in Example 15. In the production process, PVA is first applied and dried at a rate of 3 g / m ² , and then a total of 10 g / m ^{2 of} diammonium phosphate solution and lithium chloride is applied and dried as a hygroscopic agent. A heat exchange element paper 10 was obtained. This total heat exchange element paper is substantially non-porous, and the carbon dioxide permeability coefficient measured by the method A (differential pressure method) of JIS K 7126 is 1.0 × 10 ⁻¹⁰ mol · m / m ² · s · The thickness at Pa was 115 μm.

  The total heat exchange element paper produced in the above example was evaluated by the following evaluation method. The results are summarized in Table 2.

(Moisture permeability)
Evaluation was performed in the same manner as in Examples 1-7. This moisture permeability is a value representing humidity exchangeability, and the larger the value, the better.

(The amount of heat conduction)
Evaluation was performed in the same manner as in Examples 1-7. The amount of heat conduction is an index representing heat exchange properties, and the larger the better, the better.

(Shielding: carbon dioxide leakage)
In Example 14, a corrugated total heat exchange element was prepared using 75 g / m ² high quality paper for the flute using the total heat exchange element paper produced in Examples 8-13 and 15-18 as a partition plate. did. Ventilation was performed by ventilating a synthetic air gas containing nitrogen: oxygen at 79:21 from the supply side of the total heat exchange element and venting a polluted gas containing carbon dioxide at a constant concentration on the exhaust side. The carbon dioxide concentration was measured at the outlet on the air supply side, and the amount of carbon dioxide leakage was calculated in% compared to the carbon dioxide concentration at the exhaust side inlet. When the amount of carbon dioxide leakage is 5% or more, x is 1% or more and less than 5% is evaluated as Δ, 0.1% or more and less than 1% is evaluated as ◯, and less than 0.1% is evaluated as ◎.

<Evaluation>
From the results of Examples 8 to 13 and 15 to 18, it is clear that the paper using the nonporous total heat exchange element paper of the present invention has excellent heat conductivity, moisture permeability and gas shielding properties. When porous paper is used, increasing the thickness or mixing with a binder that fills the holes can reduce the amount of carbon dioxide leakage, but at the same time, the moisture permeability and heat conductivity are reduced, resulting in good total heat exchange. The paper does not become element paper, and the amount of leakage is so large that it does not compare with the amount of carbon dioxide leakage of the non-porous total heat exchange element paper of the present invention. It is clear. Since the total heat exchange element paper of the present invention is basically nonporous, it has a sufficient carbon dioxide shielding property even if the thickness is reduced, and the moisture permeability is also reduced by the reduced thickness (heat exchange property). As a result, a better quality total heat exchange element paper can be obtained. The total heat exchanging element using the total heat exchanging element paper of the present invention can exchange heat and moisture well without mixing indoor and outdoor air supply and exhaust, and can provide a high quality total heat exchanging function.

(3) Third aspect example 19
And a condenser paper type total heat exchange element sheets 11 50 wt% of diammonium phosphate solution is 10 g / m ² coated and dried as the moisture absorbent to the condenser paper having a basis weight of 20 g / m ^2. This condenser paper type total heat exchange element paper has a carbon dioxide permeation coefficient of 5.0 × 10 ⁻¹³ mol · m / m ² · s · Pa or less, as measured by A method (differential pressure method) of JIS K 7126. The film was nonporous and the thickness was 20 μm.

Example 20
In Example 19, the diammonium phosphate solution was 30 g / m ² coated with dried condenser paper type total heat exchange element sheets 12 as hygroscopic agent condenser paper having a basis weight of 50 g / m ^2. This condenser paper type total heat exchange element paper has a carbon dioxide permeation coefficient of 5.0 × 10 ⁻¹³ mol · m / m ² · s · Pa or less, as measured by A method (differential pressure method) of JIS K 7126. It was nonporous and had a thickness of 50 μm.

Example 21
In Example 19, a condenser paper type having a basis weight of 8 g / m ^2, a 50 wt% diammonium phosphate solution and a 50 wt% lithium chloride solution as a hygroscopic agent, 4 g / m ^{2 was} applied and dried. A total heat exchange element paper 13 was obtained. This condenser paper type total heat exchange element paper has a carbon dioxide permeation coefficient of 5.0 × 10 ⁻¹³ mol · m / m ² · s · Pa or less, as measured by A method (differential pressure method) of JIS K 7126. The film was nonporous and had a thickness of 8 μm.

Example 22
A typewriter paper having a basis weight of 16 g / m ² and a density of 0.65 g / cm ³ was coated with 10 g / m ² of a 50 wt% diammonium phosphate solution as a hygroscopic agent and dried to obtain a total heat exchange element paper 14. . This condenser paper type total heat exchange element paper has a carbon dioxide permeability coefficient measured by the method A (differential pressure method) of JIS K 7126 substantially ^exceeding 5.0 × 10 ⁻¹¹ mol · m / m ² · s · Pa. The thickness was 20 μm.

Example 23
In Example 22, a 50% by weight of diammonium phosphate solution was 30 g / ^{m 2} coated and dried to the total heat exchange element sheets 15 as hygroscopic agent typewriter paper having a basis weight of 40 g / ^{m 2.} This condenser paper type total heat exchange element paper has a carbon dioxide permeability coefficient measured by the method A (differential pressure method) of JIS K 7126 substantially ^exceeding 5.0 × 10 ⁻¹¹ mol · m / m ² · s · Pa. It was porous and the thickness was 50 μm.

Example 24
In Example 22, to 4g / m ² coated and dried the combined 50% by weight of diammonium phosphate solution and 50 wt% lithium chloride solution in ultrathin typewriter paper having a basis weight of 8 g / m ² as a moisture absorbent The total heat exchange element paper 16 was obtained. This condenser paper-type total heat exchange element paper has a carbon dioxide permeability coefficient measured by the method A (differential pressure method) of JIS K 7126, substantially ^exceeding 5.0 × 10 ⁻¹¹ mol · m / m ² · s · Pa. The thickness was 10 μm.

Example 25
50 wt% of diammonium phosphate solution was 50 g / m ² coated and dried to condenser paper type total heat exchange element sheets 17 as hygroscopic agent condenser paper having a basis weight of 75 g / m ^2. This condenser paper type total heat exchange element paper has a carbon dioxide permeation coefficient of 5.0 × 10 ⁻¹³ mol · m / m ² · s · Pa or less, as measured by A method (differential pressure method) of JIS K 7126. The film was nonporous and the thickness was 75 μm.

Example 26
And a condenser paper type total heat exchange element sheets 18 and basis weight condenser paper of 5 g / m ² as a moisture absorbent 50 wt% and diammonium phosphate solution lithium chloride solution 2.6 g / m ² coated and dried . This condenser paper type total heat exchange element paper has a carbon dioxide permeability coefficient measured by the method A (differential pressure method) of JIS K 7126 substantially ^exceeding 5.0 × 10 ⁻¹¹ mol · m / m ² · s · Pa. The thickness was 5 μm.

  The total heat exchange element paper produced in the above example was evaluated by the following evaluation method. The results are summarized in Table 3.

(Moisture permeability)
Evaluation was performed in the same manner as in Examples 1-7.
(The amount of heat conduction)
Evaluation was performed in the same manner as in Examples 1-7.
(Shielding: carbon dioxide leakage)
Evaluation was performed in the same manner as in Examples 8 to 13 and 15 to 18.

<Evaluation>
From the results of Examples 19 to 21 and 22 to 26, it is clear that the paper using the condenser paper type non-porous total heat exchange element paper of the present invention has excellent heat conductivity, moisture permeability and gas shielding properties. It is. When using a porous paper that does not use condenser paper, increasing the thickness or mixing a binder that fills the holes can reduce the amount of carbon dioxide leakage, but at the same time, the moisture permeability and heat conductivity will decrease. It does not become a good total heat exchange element paper, and the amount of leakage is larger than that of the nonporous total heat exchange element paper of the present invention. It is clear that the paper is inferior. Since the condenser paper type total heat exchange element paper of the present invention is basically nonporous, it has a sufficient carbon dioxide shielding property even if the thickness is reduced. (Exchangeability) is also improved, and a higher quality total heat exchange element sheet is obtained. The total heat exchanging element using the total heat exchanging element paper of the present invention can exchange heat and moisture well without mixing indoor and outdoor air supply and exhaust, and can provide a high quality total heat exchanging function. Moreover, favorable heat-conductivity, moisture permeability, and gas-shielding property are obtained by setting it as the range of the thickness of this invention. If the thickness is greater than that of the present invention, the gas shielding property is sufficient, but the heat conductivity and moisture permeability are not sufficient, which is not preferable as the total heat exchange element paper. If the thickness is less than that of the present invention, the gas shielding property is insufficient due to pinholes, which is also not preferable as the total heat exchange element paper.

Example 27
50 wt% of diammonium phosphate solution was tracing paper type total heat exchange element sheets 19 to 12 g / m ² coated and dried as the moisture absorbent in the tracing paper having a basis weight of 20 g / m ^2. This tracing paper type total heat exchange element paper has a carbon dioxide permeability coefficient of 5.0 × 10 ⁻¹³ mol · m / m ² · s · Pa or less measured in accordance with JIS K 7126 method A (differential pressure method). It was nonporous and had a thickness of 20 μm.

Example 28
In Example 27, the diammonium phosphate solution was 33 g / m ² coated and dried to tracing paper type total heat exchange element sheets 20 as hygroscopic agent tracing paper basis weight 50 g / m ^2. This tracing paper type total heat exchange element paper has a carbon dioxide permeability coefficient of 5.0 × 10 ⁻¹³ mol · m / m ² · s · Pa or less measured in accordance with JIS K 7126 method A (differential pressure method). It was nonporous and had a thickness of 50 μm.

Example 29
In Example 27, tracing and basis weight 8 g / m ² tracing paper together 50 wt% of diammonium phosphate solution and 50 wt% lithium chloride solution as a hygroscopic agent 5 g / m ² coated and dried Paper-type total heat exchange element paper 21 was obtained. This tracing paper type total heat exchange element paper has a carbon dioxide permeability coefficient of 5.0 × 10 ⁻¹³ mol · m / m ² · s · Pa or less measured in accordance with JIS K 7126 method A (differential pressure method). It was nonporous and had a thickness of 8 μm.

Example 30
50 wt% of diammonium phosphate solution was 12 g / m ² coated and dried to the total heat exchange element sheets 22 as hygroscopic agent typewriter paper having a basis weight of 16g / m ^2. This tracing paper type total heat exchange element paper has a carbon dioxide permeation coefficient of 5.0 × 10 ⁻¹¹ mol · m / m ² · s · Pa measured by A method (differential pressure method) of JIS K 7126, and is substantially It was porous and the thickness was 20 μm.

Example 31
In Example 30, a 50% by weight of diammonium phosphate solution was 33 g / ^{m 2} coated and dried to the total heat exchange element sheets 23 as the basis weight 40 g / ^{m 2} of typewriter paper moisture absorbent. This tracing paper type total heat exchange element paper has a carbon dioxide permeation coefficient of 5.0 × 10 ⁻¹¹ mol · m / m ² · s · Pa measured by A method (differential pressure method) of JIS K 7126, and is substantially It was porous and the thickness was 50 μm.

Example 32
In Example 30, and 5 g / m ² coated and dried the combined 50% by weight of diammonium phosphate solution and 50 wt% lithium chloride solution in ultrathin typewriter paper having a basis weight of 8 g / m ² as a moisture absorbent A total heat exchange element sheet 24 was obtained. This tracing paper type total heat exchange element paper has a carbon dioxide permeation coefficient of 5.0 × 10 ⁻¹¹ mol · m / m ² · s · Pa measured by A method (differential pressure method) of JIS K 7126, and is substantially It was porous and the thickness was 10 μm.

Example 33
Was tracing paper type total heat exchange element sheets 25 to 50 wt% of diammonium phosphate solution is 55 g / m ² coated and dried as the moisture absorbent in the tracing paper having a basis weight of 75 g / m ^2. This tracing paper type total heat exchange element paper has a carbon dioxide permeability coefficient of 5.0 × 10 ⁻¹³ mol · m / m ² · s · Pa or less measured in accordance with JIS K 7126 method A (differential pressure method). It was nonporous and had a thickness of 75 μm.

Example 34
Basis weight 5 g / m ² of preparative tracing paper in a moisture absorbent 50 wt% and diammonium phosphate solution of lithium chloride solution and 2.8 g / m ² coated dried tracing paper type total heat exchange element sheets 26 It was. This tracing paper type total heat exchange element paper has a carbon dioxide permeation coefficient of 5.0 × 10 ⁻¹¹ mol · m / m ² · s · Pa measured by A method (differential pressure method) of JIS K 7126, and is substantially It was porous and the thickness was 5 μm.
The total heat exchange element paper produced in the above example was evaluated by the following evaluation method. The results are summarized in Table 4.

(Moisture permeability)
Evaluation was performed in the same manner as in Examples 1-7.
(The amount of heat conduction)
Evaluation was performed in the same manner as in Examples 1-7.
(Shielding: carbon dioxide leakage)
Evaluation was performed in the same manner as in Examples 8 to 13 and 15 to 18.

<Evaluation>
From the results of Examples 27 to 29 and 30 to 34, it was found that the tracing paper type non-porous total heat exchange element paper of the present invention was excellent in heat transfer, moisture permeability and gas shielding properties. it is obvious. When using porous paper that does not use tracing paper, increasing the thickness or mixing a binder that fills the holes can reduce the amount of carbon dioxide leakage, but at the same time, the water vapor transmission rate and heat transfer rate will also decrease. The total amount of leakage is not so good as compared with the amount of carbon dioxide leakage of the non-porous total heat exchange element paper of the present invention. It is clear that the paper is inferior. Since the tracing paper type total heat exchange element paper of the present invention is basically nonporous, it has a sufficient carbon dioxide shielding property even if the thickness is reduced, and also the moisture permeability is reduced by the amount of heat conduction ( The heat exchange property) is also improved, and a higher quality total heat exchange element paper can be obtained. The total heat exchanging element using the total heat exchanging element paper of the present invention can exchange heat and moisture well without mixing indoor and outdoor air supply and exhaust, and can provide a high quality total heat exchanging function. Moreover, favorable heat-conductivity, moisture permeability, and gas-shielding property are obtained by setting it as the range of the thickness of this invention. When the thickness is greater than that of the present invention, the gas shielding property is sufficient, but the heat conductivity and moisture permeability are not sufficient, and it is not preferable as the total heat exchange element paper. If the thickness is less than that of the present invention, the gas shielding property is insufficient due to pinholes, which is also not preferable as the total heat exchange element paper.

Example 35
50 wt% of diammonium phosphate solution was glassine paper type total heat exchange element sheets 27 to 9 g / m ² coated and dried as the moisture absorbent to the glassine paper having a basis weight of 20 g / m ^2. This glassine paper-type total heat exchange element paper has a carbon dioxide permeability coefficient of 5.0 × 10 ⁻¹³ mol · m / m ² · s · Pa or less, as measured by the method A (differential pressure method) of JIS K 7126. It was nonporous and had a thickness of 25 μm.

Example 36
In Example 35, the diammonium phosphate solution was 28 g / m ² coated with dried glassine paper type total heat exchange element sheets 28 as hygroscopic agent glassine paper having a basis weight of 40 g / m ^2. This glassine paper-type total heat exchange element paper has a carbon dioxide permeability coefficient of 5.0 × 10 ⁻¹³ mol · m / m ² · s · Pa or less, as measured by the method A (differential pressure method) of JIS K 7126. It was nonporous and had a thickness of 50 μm.

Example 37
In Example 35, a glassine paper type having a basis weight of 8 g / m ^2, a 50 wt% diammonium phosphate solution and a 50 wt% lithium chloride solution as a moisture absorbent, 4 g / m ² applied together and dried. A total heat exchange element paper 29 was obtained. This glassine paper-type total heat exchange element paper has a carbon dioxide permeability coefficient of 5.0 × 10 ⁻¹³ mol · m / m ² · s · Pa or less, as measured by the method A (differential pressure method) of JIS K 7126. The film was nonporous and the thickness was 10 μm.

Example 38
A 50 g% diammonium phosphate solution as a moisture absorbent was applied to a typewriter paper having a basis weight of 16 g / m ² at 10 g / m ² and dried to obtain a total heat exchange element paper 30. This glassine paper type total heat exchange element paper has a carbon dioxide permeability coefficient measured by the method A (differential pressure method) of JIS K 7126 substantially ^exceeding 5.0 × 10 ⁻¹¹ mol · m / m ² · s · Pa. The thickness was 20 μm.

Example 39
In Example 38, it was the total heat exchange element sheets 31 to 50% by weight of diammonium phosphate solution 27 g / ^{m 2} coated dried typewriter paper having a basis weight of 40 g / ^{m 2} as a moisture absorbent. This glassine paper type total heat exchange element paper has a carbon dioxide permeability coefficient measured by the method A (differential pressure method) of JIS K 7126 substantially ^exceeding 5.0 × 10 ⁻¹¹ mol · m / m ² · s · Pa. It was porous and the thickness was 50 μm.

Example 40
In Example 38, to 4g / m ² coated and dried the combined 50% by weight of diammonium phosphate solution and 50 wt% lithium chloride solution in ultrathin typewriter paper having a basis weight of 8 g / m ² as a moisture absorbent A total heat exchange element paper 32 was obtained. This glassine paper type total heat exchange element paper has a carbon dioxide permeability coefficient measured by the method A (differential pressure method) of JIS K 7126 substantially ^exceeding 5.0 × 10 ⁻¹¹ mol · m / m ² · s · Pa. The thickness was 10 μm.

Example 41
50 wt% of diammonium phosphate solution was 45 g / m ² coated and dried to glassine paper type total heat exchange element sheets 33 as hygroscopic agent glassine paper having a basis weight of 75 g / m ^2. This glassine paper-type total heat exchange element paper has a carbon dioxide permeability coefficient of 5.0 × 10 ⁻¹³ mol · m / m ² · s · Pa or less, as measured by the method A (differential pressure method) of JIS K 7126. It was nonporous and had a thickness of 85 μm.

Example 42
Basis weight 8 g / m ² of glassine paper as a moisture absorbent 50 wt% and diammonium phosphate solution of lithium chloride solution 2.2 g / m ² coated with dried to a glassine paper type total heat exchange element sheets 34 . This glassine paper type total heat exchange element paper has a carbon dioxide permeability coefficient measured by the method A (differential pressure method) of JIS K 7126 substantially ^exceeding 5.0 × 10 ⁻¹¹ mol · m / m ² · s · Pa. The thickness was 8 μm.

  The total heat exchange element paper produced in the above example was evaluated by the following evaluation method. The results are summarized in Table 5.

(Moisture permeability)
Evaluation was performed in the same manner as in Examples 1-7.
(The amount of heat conduction)
Evaluation was performed in the same manner as in Examples 1-7.
(Shielding: carbon dioxide leakage)
Evaluation was performed in the same manner as in Examples 8 to 13 and 15 to 18.

<Evaluation>
From the results of Examples 35 to 37 and 38 to 42, it is obvious that the glassine paper type nonporous total heat exchange element paper of the present invention has excellent heat transfer, moisture permeability and gas shielding properties. It is. When porous paper that does not use glassine paper is used, increasing the thickness or mixing with a binder that fills the holes can reduce the amount of carbon dioxide leakage, but at the same time, the moisture permeability and heat conductivity are reduced, which is good. The total amount of leakage is larger than that of the non-porous total heat exchange element paper of the present invention, and the amount of leakage is not comparable. It is clear that the paper is inferior. Since the glassine paper type total heat exchange element paper of the present invention is basically non-porous, it has a sufficient carbon dioxide shielding property even if the thickness is reduced. (Exchangeability) is also improved, and a higher quality total heat exchange element sheet is obtained. The total heat exchanging element using the total heat exchanging element paper of the present invention can exchange heat and moisture well without mixing indoor and outdoor air supply and exhaust, and can provide a high quality total heat exchanging function. Moreover, favorable heat-conductivity, moisture permeability, and gas-shielding property are obtained by setting it as the range of the thickness of this invention. When the thickness is greater than that of the present invention, the gas shielding property is sufficient, but the heat conductivity and moisture permeability are not sufficient, and it is not preferable as the total heat exchange element paper. If the thickness is less than the present invention, the gas shielding property is not sufficient due to pinholes, which is also not preferable as the total heat exchange element paper.

  According to the present invention, it is possible to provide an excellent total heat exchange element sheet and total heat exchange element that are excellent in heat transfer, moisture permeability, and gas shielding properties and do not cause mixing of air supply and exhaust.

Claims (3)

It is defined Canadian variant Freeness in total heat exchange element sheets formed by incorporating a moisture absorbent natural pulp beaten to the paper a paper as a main component below 150ml below.
Canadian Modified Freeness: Value measured according to the Canadian Standard Freeness Test Method of JIS P 8121, except that 0.5g of pulp was collected by dry-drying and the sieve plate was made into 80 mesh plain weave bronze wire. . The total heat exchange element paper according to claim 1, wherein the density is 0.9 g / cm ³ or more.   A total heat exchange element using the total heat exchange element paper according to claim 1.