JP3136301B2 - Metal plate with condensation water drop prevention function - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for preventing dripping of condensed water that forms on the inner surface of a metal roofing material or the surface of a metal wall material of a building.

[0002]

2. Description of the Related Art Metal plates such as iron plates, aluminum plates, and copper plates are widely used as roofs and wall materials. For example, in the case of a metal roof, a metal plate having a shape such as a folded plate type, a tile bar type, a corrugated plate type, and a goby fold type is often used.

[0003] By the way, in the case of a roof or wall material made of a metal plate having a high thermal conductivity, indoor water vapor is often condensed due to fluctuations in the outside air temperature, and dew is condensed on the surface of the metal plate. The adverse effect of dew condensation is remarkable when the temperature of the outside air is large between winter and spring or when the humidity is high during the rainy season. When storing products in a warehouse or the like, it is often the case that the outside temperature drops rapidly after a few warm days in the early spring. In such a case, the temperature of the surface of the roofing material that contacts the outside air is considerably lower than the temperature of the surface of the roofing material that contacts the air, and dew condensation occurs on the surface of the roofing material on the indoor side. Also, in Japan, the temperature rises rapidly during the year during the rainy season, and when the temperature rises rapidly in this way, the temperature difference between the indoor and outdoor areas is the most severe, and the adverse effects of dew condensation become remarkable. . Slightly after the rise in the outside air temperature, the temperature of the air in the room starts to rise, and after that, the temperature of the wall surface starts to rise, and then reaches almost the equilibrium temperature. At this time, since the relative humidity is extremely high, it is said that if the temperature of the wall surface is lower than the temperature of the surrounding atmosphere by about 2 to 4 ° C., the dew point is reached and dew condensation occurs on the wall surface.

[0004] The condensed water generated in this way corrodes the metal plate and shortens the life of the metal plate, and causes the condensed water to drip and contaminate the ceiling, the walls, the floor and the like, causing stains and the like. Or Also, in factories and warehouses without ceilings, the condensed water condenses and corrodes products and equipment. Also, if it is dropped on the electric wiring part, it may cause an electric leakage.

[0005]

Conventionally, in order to prevent dew condensation, a method of fixing a heat insulating material such as rock wool, glass wool, urethane foam resin, or non-woven fabric to the inner surface of a metal plate has been adopted. However, such a method of fixing the heat insulating material to the metal plate is often performed after the metal plate is constructed at the construction site, and the work is inevitably complicated. In addition, there are also problems such as a lot of construction work in a narrow place, troublesome and dangerous, and a high cost. Also,
In the construction of glass wool, rock wool, etc., the working environment is poor, there is a problem in the treatment of residual materials, and furthermore, when urethane foam resin is burned, it generates a large amount of heat and toxic gas, so there is also a problem in disaster prevention.

[0006] Even when the heat insulating material is fixed to the metal plate as described above, it is extremely difficult to completely prevent the occurrence of dew condensation. In particular, as described above, from winter to spring, when the temperature difference between the outside air is large, or when the humidity is high during the rainy season, it is inevitable that condensation water condenses on the inner surfaces of the roof and wall materials. Since these heat insulating materials have a small "water drop falling limit value" described later, it is inevitable that the absorbed water drops without being retained in the heat insulating material.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks of the conventional method and to provide a simple and effective means capable of preventing dripping of dew condensation water which forms on the inner surface of a metal plate. is there.

[0008]

That is, the present invention is made from paper pulp and has a water resistance of 0.3 kgf / 15.
mm or more, water droplets fall limit capacity value 45 g / m ² or more, and basis weight is characterized in that the sheet is 40~5000g / m ² was pasted to the metal plate, a metal having anti-drip function condensed water It is a board.

[0009] The present inventors have observed the situation in which dew condensation occurs in detail, and reexamined the situation from a completely new point of view, so that the adverse effect of dew condensation can be prevented by simply laminating a special sheet on a metal plate. I found what I could do. As described above, the detrimental effect of dew condensation is caused by dropping of dew condensation water and contaminating the ceiling and the like. That is, even if dew condensation occurs, these adverse effects do not occur unless the dew water drops. The present inventors, under the idea that dripping will not occur once the dew water is absorbed in any way,
First, an experiment was performed by bonding various water absorbing materials to a metal plate.

Further, the present inventors consider the ease of construction, productivity, production price, etc.
Based on the judgment that the paper material made from papermaking pulp was the best, we examined the water absorption characteristics of various paper materials and found that the new measure called the "water drop limit capacity value" provided a new measure to prevent the condensation water from dripping. Can be determined effectively. This water drop limit capability value is Wa (g /
m ² ) of a test piece of paper which had been completely dried was immersed in water, pulled up after 4 hours, suspended vertically, and weighed after dripping of excess water adhering to the surface of the test piece was completed. (G /
m ² ), and calculate the saturated water absorption per unit area of the absolutely dried paper. That is, the water droplet drop limit capability value is [Wb-Wa] (g
/ M ² ). If the paper has a water droplet drop limit capacity value of 45 g / m ² or more, even under the worst conditions, the dew water generated on the surface of the metal plate can be absorbed by the capillary phenomenon of the paper to drop water droplets. It was found that it could be kept in the paper without any change. For these reasons, it is necessary that the paper used in the present invention has a water droplet dropping limit value of 45 g / m ² or more.

Further, if the paper does not have water resistance when the dew water is absorbed, the paper cannot maintain its shape and peels off from the metal plate. As a result of the study by the present inventors, the paper used in the present invention has a wet tensile strength of 0. 1 according to the paper wet strength measuring method specified in JIS P-8130.
It was found that a water resistance of 3 kgf / 15 mm or more was required. As will be described later, the water resistance can be obtained by adding a wet paper strength enhancer or the like during papermaking.

Further, the paper used in the present invention needs to have a strength that does not cause breakage or deformation during construction. Such basic strength is sufficient if the basis weight of the paper is 40 g / m ² or more. Also, as the basis weight is larger, the heat insulating property is improved, and the water drop falling limit value is also improved. However, paper having a basis weight of 40 g / m ² or more has moderate heat insulating properties, 4 about the limit ability value
It is possible to achieve 5 g / m ² or more. On the other hand, if the basis weight is too large, not only does the production of paper become difficult and the cost increases, but also the weight becomes heavy and the workability during construction deteriorates. From such a viewpoint, the upper limit of the grammage is 500
0 g / m ² .

Further, the paper used in the present invention is required to have a property of rapidly dispersing the dew water once absorbed. Since the paper used in the present invention is a paper, the absorbed dew water can be quickly diffused from the outer peripheral surface of the paper.

The paper used in the present invention is made by using papermaking pulp and a wet strength agent as essential materials. As papermaking pulp, NUKP, NBKP, LBKP,
Wood pulp such as NBSP is used, and hemp, cotton, straw pulp, bast fiber, synthetic fiber, PVA-based fibrous binder, glass fiber, rock wool, silica / alumina silicate fiber are mainly used as necessary. ,
Inorganic fibers such as alumina fiber, zirconia fiber and calcium titanate fiber may be appropriately mixed.

As a wet paper strength enhancer, melamine resin,
Any known wet paper strength enhancer such as a urea resin, a polyamide / epichlorohydrin resin, and a polyacrylamide-based resin can be used, and an amount necessary for obtaining a water resistance of 0.3 kgf / 15 mm or more is added. Usually, 0.05 to 2.0% by weight, preferably 0.1%, based on the absolute dry weight of the pulp.
The wet strength agent is added in the range of 5 to 1.0% by weight.

In papermaking, a wet paper strength enhancer, a fixing agent, and, if necessary, a dry paper strength enhancer, a sizing agent, a coloring agent and the like are appropriately added to the pulp for papermaking, and usually 300 to 620 ml of freeness. S. F. The paper is made by a conventional method using a round paper machine, a fourdrinier paper machine or the like.

The paper thus formed has the water drop falling capacity, water resistance, strength, moldability, dew condensation water dissipation, heat insulation and the like required for the paper used in the present invention. However, for the purpose of further promoting and improving the heat insulating properties of the paper, the ability to prevent water drops from falling, the ability to disperse dewed water, the formability, etc., inorganic powders are added to paper pulp to form paper, It is desirable to apply a coating liquid containing a binder as a main material on one side or both sides of the base paper.
Further, depending on the type of the inorganic powder used, the flame retardancy, moisture absorption and release properties of the paper, and the ability to prevent the growth of mold and bacteria can be enhanced.

The types of inorganic powders used include kaolin, clay,
In addition to calcium carbonate, titanium dioxide, talc, etc., use self-extinguishing inorganic powder, hygroscopic inorganic powder, antibacterial inorganic powder, etc., alone or as a mixture of these. Can be.

Examples of the self-extinguishing inorganic powder include aluminum hydroxide, magnesium hydroxide, calcium aluminate, calcium hydroxide, calcium aluminate, zinc borate, calcium borate, barium metaborate, borax, and the like. Boric acid and the like, which have the ability to release a large amount of water by an endothermic reaction when heated to prevent combustion. In order to impart flame retardancy to paper, it is necessary to use a large amount of these self-extinguishing powders.
For example, in the case of aluminum hydroxide, it is necessary to contain 80% by weight or more based on the cellulose fiber in order to obtain flame retardancy by itself.

Examples of the inorganic powder having a moisture absorbing / releasing property include a powder itself absorbing and releasing moisture, and a powder itself which does not absorb and release moisture but has a large specific surface area due to its structure, and absorbs moisture by capillary action. There is something to do. Examples of the former include silica gel, silica-alumina gel, alumina gel, synthetic zeolite, natural zeolite, synthetic silica, acid clay, activated clay, α-sepiolite, β-sepiolite, palygorskite (atavalgitite), allophane, imogolite and the like. Examples include vermiculite and calcium silicate.

Examples of the inorganic powder having antibacterial properties include those obtained by incorporating antibacterial ions such as silver ions and copper ions into the skeleton structure of zeolite, and activated carbon fibers to which silver ions are added.

In the present invention, when the inorganic powder is mixed with paper pulp for papermaking, the inorganic powder is usually added in an amount of 85 to 10% by weight based on 15 to 90% by weight of the pulp. If the amount of the inorganic powder exceeds 90% by weight, the physical strength of the paper becomes insufficient, which is not preferable.

As a method of using the inorganic powder, there is a method of coating a base paper with a coating liquid mainly composed of an inorganic powder and a binder, in addition to a method of internally adding the inorganic powder during papermaking. When preparing the coating liquid, the inorganic powder as described above may be used alone or in a mixture of 2 or more.
After mixing and dispersing by adding a dispersing agent thereto, a synthetic rubber latex such as SBR or MBR is used as a binder;
An acrylic emulsion, a vinyl chloride emulsion, a vinylidene chloride emulsion, a copolymerized emulsion thereof, and the like, casein, starch, PVA, and the like are appropriately combined and added. At this time, water retention agent, flow improver, fungicide,
Secondary materials such as preservatives and coloring agents are added as required. As the binder, it is preferable to mainly use, for example, vinyl chloride or vinylidene chloride emulsion having a small calorific value and flame retardancy, or a copolymer thereof.

As the antifungal agent, a known compound such as a compound of a benzimidazole compound or a nitrogen-containing sulfur compound can be used, and it is usually added in an amount of 0.1 to 1.2% by weight based on the coating solution. When the above-mentioned antibacterial inorganic powder is used as the inorganic powder, the amount of the fungicide to be added is small.

If the proportion of the binder to the inorganic powder is too small, the required strength of the coating layer is not obtained, and if it is too large, the flame retardancy and the like are adversely affected. Add 30% by weight. The coating solution thus prepared is
One side or both sides of the base paper are coated with a coating machine such as an air knife coater, blade coater, roll coater or the like.

As described above, a large amount of inorganic powder must be used in combination to make the paper flame-retardant using only inorganic powder having self-extinguishing properties, which causes problems such as a reduction in paper strength. There is a risk. In order to prevent this drawback, a base press made with a small amount of the inorganic powder added to a paper machine (ie, on-machine processing), a size press device, a bill blade coater,
If necessary, a flame retardant can be impregnated with a gate roll coater or the like. As the flame retardant to be impregnated, use a guanidine sulfamate, guanidine phosphate, ammonium sulfamate, a condensed phosphate alkyl ester derivative, guanidine sulfate, ammonium phosphate, ammonium sulfate, or the like that can be dispersed in an aqueous solution or water. Can be. Further, a paper-making auxiliary material such as starch, a sizing agent, a dye, and a heat-resistant auxiliary such as dicyandiamide, a methylolated melamine, or a methylolated dicyandiamide may be used in combination therewith. 35% impregnation. If necessary, a coating liquid mainly composed of an inorganic powder and a binder may be applied to the front surface, the back surface, or both the front and back surfaces of the base paper impregnated with a flame retardant or the like. These processes may be performed after the base paper is made (ie, off-machine processing).

In the present invention, a reinforcing sheet is attached to the surface of the paper thus produced, that is, the surface not in contact with the metal plate, in order to further improve the durability and to prevent the surface from being scratched. Can also. Considering the flame retardancy, the reinforcing sheet is preferably a flame retardant sheet such as a glass cloth, a carbon fiber cloth, or a ceramic fiber cloth. In addition, when laminating, it is necessary to consider the amount of the adhesive or to partially bond the adhesive so as not to impair the moisture absorption / release properties. If necessary, offset printing, gravure printing, screen printing, or the like, or resin or the like can be printed or coated on the surface of the paper for the purpose of improving the design. At this time, in order not to impair the moisture absorption and release, use ink or resin with moisture permeability,
It is necessary to print or coat partially.

The metal plate used in the present invention is made of a metal such as iron, stainless steel, copper, or aluminum, and usually has a thickness of 0.2 to 3 mm, preferably 0.6 to 1.5 mm. You. As the metal plate, a metal plate that has been subjected to processing such as plating, printing, coating with a paint, and laminating a film can be used in order to improve durability and design.

As a method for bonding the metal plate and the paper, for example, the following methods 1) to 5) can be adopted. 1) Wet lamination method: An aqueous or solvent-based paste such as a starch paste or a vinyl acetate emulsion paste is applied, then pasted, and the paste is dried. 2) Dry lamination method: using a polyurethane-based adhesive or the like, evaporating the solvent after coating, and passing between heat rolls for pressure bonding. 3) Extrusion lamination method: A molten resin, such as polyethylene or polypropylene, is extruded from a T-die between a thin metal plate and paper to be bonded. 4) Hot melt lamination method: A molten resin such as an ethylene-vinyl acetate copolymer resin is applied and bonded. 5) Lamination method using an adhesive film: An ionomer resin or an ethylene-vinyl acetate copolymer resin film or the like is inserted between a metal plate and a sheet, and bonded by applying pressure between heating rolls.

When the above methods 3) and 5) are used, the adhesive layer between the thin metal plate and the paper serves as a film-like barrier, and the dew condensation water absorbed by the paper becomes a metal. Contact with the thin plate can be prevented, and corrosion of the thin metal plate can be effectively prevented. In particular, the extrusion lamination method using polyethylene can be preferably employed because it is easy to work, the resin is inexpensive, and the amount of heat when burned is small. In this method, it is preferable to extrude and bond so that the layer thickness of polyethylene is usually 5 to 30 μm. When the above methods 1), 2) and 4) are used, the adhesive is not applied over the entire surface, but is partially applied such as spot application, line application, and cross-girder application. can do.

The paper used in the present invention has about 1st class flame retardancy specified in JIS A 1321 "Test method for flame retardancy of building interior materials and construction methods" in consideration of the construction place. It is desirable. In order for the paper to be the first class of flame retardant, it is necessary that the combustible material is 10 to 50% by weight based on the absolute dry weight of the paper. Therefore, the basis weight is 40 to 500.
For paper of 0 g / m ² , (4 to 20) to (500 to
2500) g / m ² of combustible material. The combustibles contained in the paper mainly include organic substances such as cellulose fiber (pulp), paper strength enhancer, sizing agent, fixing agent, latex and the like. When combustibles exceed 50% by weight,
In the base material test according to JIS A 1321, a temperature rise exceeding 810 ° C. was observed, and further, in the surface test, the smoke generation coefficient and the exhaust temperature exceeded the reference values, so the test was rejected. On the other hand, if the amount of combustibles is less than 10% by weight, the strength of the paper decreases, and it is impossible to achieve 45 g / m ² , which is the minimum value of the water droplet dropping limit capability. Preferably, the amount of combustible material is in the range of 15 to 35% by weight, and a flame-retardant paper in which a coating layer of inorganic powder is provided on one side or both sides of the paper to enhance the flame retardancy is optimal.

After the metal plate having the function of preventing condensation water from dripping according to the present invention is manufactured as described above, the metal plate can be further shaped according to the purpose of use. For example, FIG.
Fig. 3 shows a cross-sectional view of a metal plate of the present invention formed for use in a folded plate type roofing material, which can be formed into a shape as shown by using a forming machine. In the figure, 1 indicates a metal plate and 2 indicates a sheet. The molded metal plate is installed on a roof or the like by a normal construction method.

The paper absorbs dew condensation water and holds it inside the paper layer. Eventually, the absorbed water evaporates when the temperature difference decreases and the surroundings exceed the dew point. In order for the dew condensation water not to fall down, the amount of water that can be absorbed by the paper must be greater than the amount of dew condensation water. The amount of dew is determined by the volume of the building, the rate of temperature change in the outside air,
It varies greatly depending on the rate of change in humidity, the presence or absence of metal plate molding, the rate of temperature change in the metal plate, the degree of outside air flowing into the room, and the like. Therefore, the "water drop limit capability value" to be provided by the paper varies depending on the conditions of the construction place.

As described above, the adverse effect of dew condensation appears remarkably during the rainy season when the temperature rises sharply. Taking this time as an example, the mechanism by which dew condensation occurs will be described in detail. For example, a warehouse initially having an atmosphere of 25 ° C. and 100% RH (relative humidity) may have an outside temperature of 30 ° C. and 100% RH due to a sudden rise in temperature.
, The atmosphere in the warehouse also reaches 30 ° C., 100% RH, and the wall and ceiling temperatures remain at 25 ° C. Of course, such conditions are severe conditions that hardly occur in practice. The amount of water contained in air at 30 ° C. and 100% RH is 35.2 g / m ³ ,
The amount of water contained in the 0% RH air is 26.0 g / m ^3.
Can be obtained from a conversion table. That is, 3
When air at 0 ° C. and 100% RH is cooled to 25 ° C., 35.
^{2-26.0 = 9.2 (g / m 3} ) of water of condensation (condensation)
You can see.

On the other hand, in a relatively small rectangular parallelepiped warehouse having a length of 5 m, a width of 10 m and a height of 3 m, the metal plate of the present invention is applied only to the roof, and the heat insulating material is applied to the wall and floor. Assume an example in which the metal plate of the present invention is installed on a roof and a wall surface, and a heat insulating material is installed on a floor surface. The volume of the warehouse is 150 m ³ (5 × 1
0 × 3), the total amount of dew condensation of 9.2 g of water per 1 m ³ is 1380 g. Thus the amount of water in the former case the condensation on the roofing material, since the roof area is 50 m ^2, a 27.6 g / m ^2. Similarly, in the latter case, the amount of water condensing on the roof material and the wall surface is 9.9 g / m ² .

In a relatively large rectangular parallelepiped warehouse having a length of 20 m, a width of 50 m, and a height of 5 m, the same calculation is made. When the metal plate of the present invention is applied only to the roof, the amount of water condensed is reduced. 46 g / m ² , and 27.1 g / m ² when applied to the roof and wall.

The metal plate of the present invention having the function of preventing the condensation water from dripping absorbs the condensation water and retains the water inside the paper layer. Eventually, as the surrounding area becomes higher than the dew point, the absorbed water is released and the paper dries. In this way, moisture absorption and desorption of the condensed water is repeated according to the change of the surrounding dew point.

By molding the metal plate, there is another advantage that the specific surface area can be increased, the water drop falling capacity per unit area can be increased, and the strength can be improved.

[0039]

The present invention will be described in detail below with reference to examples and comparative examples. All parts by weight indicate dry parts by weight, and all yields are shown in terms of 100%. Example 1 NBKP (10 parts by weight) and LBKP (10 parts by weight) were beaten to give a freeness of 400 ml. S. F. 70 parts by weight of aluminum hydroxide (trade name "B-153", manufactured by Nippon Light Metal Co., Ltd.) and 10 parts by weight of antibacterial powder (trade name "antibacterial Zeomic", manufactured by Shinagawa Fuel Co., Ltd.) 1 part by weight of cationic starch (trade name "Neotack L-1", manufactured by Nippon Shokuhin Kako Co., Ltd.), wet paper strength agent (trade name "Epinox P-130", manufactured by Dick Hercules Co., Ltd.) 1 part by weight, 0.5 part by weight of a sizing agent (trade name “Size Pine K-903”, manufactured by Arakawa Chemical Co., Ltd.), fixing agent (trade name “Hi Holder 351”, Kurita Water Industries Ltd.)
Was added, and 130 g / m ² base paper was formed by a conventional method using a Fourdrinier paper machine.

Aluminum hydroxide (as above) 9
5 parts by weight, 3 parts by weight of vinylidene chloride emulsion (trade name "Saran X-106", manufactured by Asahi Kasei Corporation), polyvinyl alcohol (trade name "PVA205", Kuraray Co., Ltd.)
2 parts by weight, fungicide (trade name “Coatside 5
5 ", manufactured by Takeda Pharmaceutical Co., Ltd.) and a total of 50 g / m ^{2 of a} coating solution mixed with 0.3 parts by weight of
80 g / m ² of paper was obtained.

Further, 5 g / m 2 of the polyurethane adhesive was used.
² , the paper was bonded to a 1.2 mm thick galvanized steel sheet, and various performances were evaluated. Evaluation method 1) Flameproof performance Evaluated based on JIS A1322. 2) Flame retardancy performance Evaluated based on JIS A 1321. 3) Moldability A folded plate was molded as shown in FIG. 1 and evaluated. Molding is a stacking type of “Steel folded plate roof component” specified in JIS A6514, with a peak height of 130 mm and a pitch of 300 m.
m, the upper and lower bottoms were each 80 mm. 4) Dew condensation test In the space test room (air conditioning room where temperature and humidity can be controlled)
A rectangular parallelepiped having a length of 2 m, a width of 5 m, and a height of 50 cm was manufactured using a metal plate on which the above-described paper was bonded and a wooden reinforcing material. The paper surface was on the inner surface, the upper surface was openable and closable, and the lower surface was made of heat insulating material (press board). With the top open,
The test room was kept at 30 ° C. and 100% RH for 5 hours. Next, the upper surface of the rectangular parallelepiped was closed and jointed, and then the atmosphere in the test room was changed to 25 ° C. and 100% RH. The state of dew condensation inside the rectangular parallelepiped was photographed with a CCD camera set in advance, displayed on a CRT, and observed. Both the moldability and the condensation test were marked with 極 め て for very good, ○ for good, and x for bad. Table 1 shows the results of these evaluations.

Example 2 Using the same base paper components as in Example 1, a basis weight of 40 g / m ² was used.
Base paper was made. Without coating the base paper with a coating liquid, the base paper was used as it was, bonded to a galvanized steel sheet in the same manner as in Example 1, measured for various physical properties, and evaluated for various properties. The results are also shown in Table 1.

Example 3 A base paper was prepared using the same base paper components as in Example 1, except that aluminum hydroxide was 25 parts by weight and silica gel (manufactured by Fuji Devison Co., Ltd.) was further added at 45 parts by weight.
This was further impregnated with 10 g / m ^{2 of a} flame retardant guanidine sulfamate (manufactured by Chisso Corporation) to give a basis weight of 130 g.
/ M ² of the base paper impregnated with the flame retardant. The same coating liquid as in Example 1 was applied to the front and back surfaces of the flame-retardant-impregnated base paper at the same coating amount to obtain paper having a basis weight of 180 g / m ² . This paper was bonded to a galvanized steel sheet in the same manner as in Example 1, various physical properties were measured, and various performances were evaluated. The results are also shown in Table 1.

Example 4 A base paper was prepared using the same base paper components as in Example 1 except that the total amount of NBKP and LBKP was 40 parts by weight, aluminum hydroxide was 50 parts by weight, and no antibacterial inorganic powder was added. , And impregnated with a flame retardant in the same manner as in Example 3,
A flame retardant impregnated paper having a basis weight of 245 g / m ² was obtained. The same coating solution as in Example 1 was applied to the front and back surfaces of the flame-retardant-impregnated base paper at the same coating amount to obtain paper having a basis weight of 295 g / m ² . Using this paper, it was then bonded to a galvanized steel sheet in the same manner as in Example 1, various physical properties were measured, and various performances were evaluated. The results are also shown in Table 1.

Example 5 Using the same base paper components as in Example 1, a basis weight of 5000 g /
A sheet of m ² was formed (the coating liquid was not applied), the sheet was bonded to a galvanized steel sheet, and various physical properties were measured. The results are also shown in Table 1.

Comparative Example 1 Using the same base paper components as in Example 1, a basis weight of 36 g / m ² was used.
Base paper was made. Without coating the base paper with a coating liquid, the base paper was used as it was, bonded to a galvanized steel sheet in the same manner as in Example 1, measured for various physical properties, and evaluated for various properties. Table 2 shows the results.

COMPARATIVE EXAMPLE 2 A galvanized steel sheet having a thickness of 1.2 mm was evaluated for various properties in the same manner as in Example 1. Table 2 shows the results
It is described together.

[0048]

As can be seen from Tables 1 and 2, the papers of Examples 1 to 4 of the present invention were all good in both the dew condensation test and the moldability, whereas the basis weight was 40 g / m2.
^In Comparative Example 1, which was smaller than ² , the water drop falling capacity value did not reach 45 g / m ² , and the result of the condensation test was also poor. Further, in Comparative Example 2 in which no paper was attached, naturally, dew condensation water dropped, and the result of the dew condensation test was poor.

[0050]

As described above, according to the present invention, it is possible to obtain a metal plate capable of effectively preventing condensation water from dripping. The use of such a metal plate of the present invention has the following advantages.

1) Since the paper is bonded to the metal plate in advance, it is not necessary to perform any complicated work such as fixing the heat insulating material or the like later, and a great economical effect and an effect of shortening the construction period can be expected. 2) Paper can be manufactured using normal papermaking technology,
It is possible to mass-produce products of uniform quality efficiently. 3) Flame retardancy can be easily imparted to the paper used in the present invention. 4) If necessary, multicolor printing can be easily performed on the surface of the paper by using offset printing or the like. 5) If necessary, by molding the metal plate after bonding the paper,
It is possible to increase the water drop falling capacity per unit area. Also, mechanical strength can be improved. 6) By utilizing such characteristics, the metal plate of the present invention can effectively prevent the adverse effects of dew condensation by being used for roofing materials, wall covering materials, cold air outlets of air conditioners, packaging cases for precision parts, and the like. it can.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a metal plate of the present invention used for a folded plate type roofing material.

[Explanation of symbols]

 1 Metal plate 2 Paper

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akinobu Takagi 8-10 Miyukicho, Numazu City, Shizuoka Prefecture (56) References JP-A-2-233243 (JP, A) (58) Fields investigated (Int. ⁷ , DB name) B32B 15/12 E04D 3/35

Claims (5)

(57) [Claims] 1. A paper is made from pulp for paper making, has a water resistance of 0.3 kgf / 15 mm or more, and has a water droplet dropping limit value of 4
5 g / m ² or more and basis weight of 40 to 5000 g / m ²
1. A metal plate having a function of preventing condensation water from dripping, characterized in that the sheet is bonded to a metal plate. 2. The metal plate according to claim 1, wherein the paper is made from 15 to 90% by weight of paper pulp and 85 to 10% by weight of inorganic powder. 3. A metal plate having a function of preventing condensation water from dropping, according to claim 1, wherein said paper is coated on one or both sides thereof with a coating liquid mainly composed of an inorganic powder and a binder. 4. The metal plate having a function of preventing condensation water from dripping according to claim 2, wherein the inorganic powder is an inorganic powder having self-extinguishing properties. 5. The metal plate having a function of preventing condensation water from dripping according to claim 2, wherein the inorganic powder is an inorganic powder having a moisture absorbing and releasing property.