JP3452987B2 - Manufacturing method of air conditioning duct - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an air conditioning duct capable of preventing the dew condensation water from condensing on the outer periphery of an air conditioning duct such as a building.

[0002]

2. Description of the Related Art An air-conditioning duct used for air-conditioning piping of buildings such as buildings is a metal plate formed into a tubular shape having a rectangular cross section, a circular shape, or an elliptical shape. A rectangular duct or a circular duct with a square or circular cross-section that is made by using an S-type gob or an instep goby, etc., as well as spirally winding a metal plate while continuously matching the abutted edges There is known a spiral duct formed into a cylindrical shape, and a flexible spiral duct having stretchability and flexibility formed by forming corrugated ribs between the gore-matching portions of the spiral duct.

By the way, when such an air conditioning duct is used as a cooling pipe or an intake side pipe of a ventilation pipe, dew condensation occurs on the outer periphery of the duct due to a temperature difference between the inside and outside of the duct, which causes corrosion of the duct. The life of the building is shortened, and dew condensation water drips and contaminates the inside of the building, causing stains, shortening the life of the building, and, in some cases, causing electric leakage. Here, in order to prevent such dew condensation, conventionally, at the construction site, rock wool, glass wool, urethane foam resin, non-woven fabric, or other heat insulating material is wrapped around the outer circumference of the duct, and this is covered with tape or a metal plate and fixed to the duct. I was trying to insulate the inside and outside of the duct, but such work has to be done after piping and fixing the air conditioning duct inside the building at the construction site,
It is unavoidable that the work will be complicated, it will take time and labor because it will be installed in a narrow place, and it will also be dangerous because it will be work at high places, and if glass wool is used as the heat insulating material, etc. There was a problem that the hygienic work environment was impaired. In addition, there is also a problem that the work requires a lot of time and cost.

In order to solve such a problem, for example, in Japanese Unexamined Patent Publication No. 5-306832, instead of winding the heat insulating material, the outer circumference of the tubular duct body is
An air-conditioning duct has been proposed in which air-conditioning duct paper with water resistance strength, water drop limit capacity value, grammage, etc. set in a predetermined range is attached and the outer circumference of the duct body is covered. Here, in the air-conditioning duct described in this publication, in order to attach the air-conditioning duct paper to the duct body, for example, a zinc steel plate to which the air-conditioning duct paper is pasted is slit into a predetermined width to form a rolled-up shape. , To form a cylindrical spiral duct by sequentially winding in a spiral shape, or to apply the air-conditioning duct paper cut into a predetermined size to the outer periphery of the duct body,
It is designed to be fixed with a net such as a turtle net, a construction lath net, wire, tape, metal band, screw, rivet, etc., or to be bonded with an adhesive or an adhesive. However, according to such an air conditioning duct, it is possible to suppress the dew condensation itself by providing the above-mentioned air conditioning duct paper with a certain degree of heat insulating property and to absorb the condensed water by this air conditioning duct paper to prevent its dripping. The excellent effect that it is possible to prevent the harmful effects caused by the above-mentioned dew condensation is exhibited.

[0005]

By the way, in the above-mentioned air conditioning duct, in addition to the straight tubular duct in which the tubular duct body has a constant cross-sectional shape and extends straight, the straight pipes are connected to each other. There is an air-conditioning duct so-called accessory that bends or branches the air-conditioning pipe or connects straight pipes having different diameters. Among them, in the latter air-conditioning duct called the accessory, for example, in order to provide a bent portion, a plurality of short straight pipes whose ends are cut off obliquely are joined by seaming, welding or the like, or by press molding or the like. It forms a curved duct. In addition, to provide a branch part, a straight pipe that branches is joined to a hole opened on the side surface of the straight pipe, and in order to provide a part to expand or reduce the diameter for connecting different diameter pipes, the appearance cone Although straight pipes with different diameters are spliced at both ends of the trapezoidal duct, in any case, in the air conditioning duct of such an accessory, the outer diameter shape of the duct body is a complicated three-dimensional curved surface. Is inevitable.

However, when it is attempted to cover the outer periphery of the duct body of the accessory air conditioning duct having such a complicated three-dimensional curved surface with the above-mentioned flat paper air-conditioning duct paper, the three-dimensional curved surface spreads in a convex shape. At a portion such as a curved outer periphery of a bent portion, a portion where the outer peripheries of a plurality of ducts intersect at an obtuse angle at a branch portion, or a portion where a diameter expands at an expansion / contraction diameter portion, the paper is forced to follow the curved shape. Also, the air-conditioning duct paper may be torn.
On the contrary, in a portion where the curved surface is concave and converging or converging, for example, in the inside of the bend of the bent portion, the crotch portion of the branch portion, or the portion in which the diameter of the expansion / contraction diameter portion is reduced,
The paper feels too much. Therefore, at these portions, the air conditioning duct paper cannot be attached so as to follow the curved shape unless the air conditioning duct paper is wrinkled, or the air conditioning duct paper is bent or overlapped.

However, when the air-conditioning duct paper is wrinkled, bent, or superposed, a gap is formed between the duct body and the paper with the air-conditioning duct paper attached to the duct body. However, it becomes impossible to cover the paper in a state where it is in close contact with the outer circumference of the duct body. In such a gap, the heat insulating property of the air-conditioning duct paper and the water absorption of the dew condensation water may be impaired, or the dew condensation generated in the gap may not be absorbed or diffused into the gap. It is held and causes corrosion of the duct body, which causes a problem that it is impossible to reliably prevent the harmful effect of dew condensation on the entire duct.

On the other hand, air-conditioning duct paper is pasted on a metal plate forming the duct body in advance with an adhesive or a pressure-sensitive adhesive, and the metal plate is bent to form a goby, welding, or press molding. Then, the bent part and the branch part
Although it is possible to manufacture an accessory air conditioning duct having an expanded / contracted diameter portion, for example, when a bent portion is formed by press molding, the elongation rate of the material is remarkably increased between the metal forming the duct body and the air conditioning duct paper. Differently, the expansion of the air-conditioning duct paper cannot follow the expansion of the metal plate, and the paper will be torn. Also, when it is attempted to form a bent portion by combining the air-conditioning ducts to which the air-conditioning duct paper has been pasted in advance, the air-conditioning duct paper will be torn off when the caulking roll is formed. There is a risk that Further, even if the air-conditioning ducts are joined by welding to form a bent portion or the like, it is necessary to remove the air-conditioning duct paper in the portion to be welded, and the air-conditioning duct paper is carbonized by the heat of welding. Such joining means by welding cannot be adopted.

The present invention has been made in view of such circumstances, and wrinkles and tears may occur not only in a straight air-conditioning duct but also in an accessory air-conditioning duct whose outer peripheral surface has a complicated three-dimensional curved surface. It is an object of the present invention to provide a method for manufacturing an air conditioning duct, which allows the duct body to be covered with an air conditioning duct paper without using the air conditioning duct.

[0010]

In order to solve the above problems and to achieve the above object, in the method for manufacturing an air conditioning duct of the present invention, the outer periphery of the tubular duct body is wetted with water or the like. A method of manufacturing an air conditioning duct, which comprises drying the air conditioning duct paper after being covered with the air conditioning duct paper in the state.
Firstly, for moistening the air conditioning duct paper,
Use of surfactants and / or softeners in water
Secondly, the air conditioner in the wet state is
The cut paper is pressure-bonded with a mold to the outer circumference of the duct body.
The third feature is that it is coated on a dry state.
The air-conditioning duct paper is moistened with hot water or heated steam.
The air-conditioning duct paper is wetted by adding
The fourth feature is that it is in a dried state.
Embossed and perforated on the above air conditioning duct paper
And at least one of crepe processing
The air-conditioning duct paper by applying it and adding moisture, etc.
The fifth feature is that it is in a wet state.
As a moist air-conditioning duct paper,
It is characterized by using the undried air-conditioning duct paper .

[0011]

In general, the elongation percentage of dried paper is about 7% or less, and if it is attempted to stretch it further, it will break as described above. However, when it is moistened with water or the like, its physical properties change significantly due to the influence of the water content. It is believed that this is due to the properties of the cellulose fiber, which is the main raw material for paper, and the hydrogen bonding between these fibers. That is, when water or the like acts on the cellulosic fibers, the fibers themselves swell to soften the paper, and molecules of water or the like enter between the interfiber bonds, so that hydrogen bonds between the fibers are formed. This is because it can be loosened. For example, under high humidity conditions, the tensile strength of paper decreases, but the tear strength, folding endurance, and elongation rate tend to increase, and this elongation rate is particularly large. It is considered that this is because the adsorbed water softens the fibers of the paper, and the hydrogen bonds between the fibers are relaxed by the water molecules entering between the fibers as described above.

In the air-conditioning duct manufacturing method of the present invention, however, the outer circumference of the tubular duct body is covered with the air-conditioning duct paper which is in a wet state containing water and has an increased elongation. , Not only in the duct body of a normal straight air-conditioning duct, but also in the duct body outer periphery of an accessory air-conditioning duct having a complicated three-dimensional curved surface such as a bent portion, a branch portion, or an expanded / contracted diameter portion. The air-conditioning duct paper can be closely adhered to the outer circumference of the duct body to cover the three-dimensional curved surface shape sufficiently. That is, at the portion where the above-mentioned three-dimensional curved surface greatly expands in a convex shape, the air-conditioning duct paper may be stretched in accordance with the expansion of this curved surface, and conversely, at the portion where the curved surface is intricate, the paper may be compressed. Even if wrinkles occur on the paper during this compression, if the paper is crushed while it is wet, the fibers containing water will fuse and a smooth outer peripheral surface can be obtained. it can. Further, as described above, the tensile strength of the paper tends to decrease by wetting the paper, but the air-conditioning duct paper is covered with the outer circumference of the duct body such as metal and has a high strength. There is no problem because it is secured by the metal plate of the duct body.

By drying the air-conditioning duct paper coated on the duct body in this way, it is possible to obtain an air-conditioning duct in which the air-conditioning duct paper is tightly adhered to the outer periphery of the duct body. In particular, since the paper has the property of shrinking when it is wet and dried, the degree of adhesion of the paper to the duct main body is further enhanced, and it is possible to more reliably prevent the formation of a gap. Therefore, in the air-conditioning duct manufactured in this way, uniform and stable heat insulation can be obtained over the entire duct, which effectively suppresses the occurrence of dew condensation, and even if dew condensation occurs, it can be quickly eliminated. Therefore, it is possible to prevent the situation that the building is contaminated due to the dripping of dew condensation water. In particular, in the air conditioning duct of the accessory of the present invention manufactured by the above manufacturing method, the air conditioning duct has a complicated three-dimensional curved surface, but as described above, the paper is prevented from being wrinkled or bent and the like. Since it can be sufficiently brought into close contact with the main body, it is effective for surely preventing the harmful effects of dew condensation in the accessory air conditioning duct.

As the paper used for the air-conditioning duct paper, the air-conditioning duct paper described in JP-A-5-306832, that is, water resistance strength of 0.3 kgf / 15 mm or more, water drop is dropped. limit capacity value is 45 g / m ² or more, and basis weight is preferably used an air conditioning duct sheet which is a 40~5000g / m ^2. In particular, as proposed in this publication, in an air-conditioning duct paper to which various inorganic substances are added in order to impart flame retardancy, nonflammability, etc. to the paper, the content of the inorganic matter becomes large, while the content of the pulp becomes large. Since the amount is small, the effect of moisture on the interfiber bond in the wet state is remarkable, the paper is flexible, and it is possible to more reliably cope with complicated curved surface shapes. When dried, this inorganic substance is solidified and becomes compatible with the duct body, which has the advantage of further improving the adhesion between the paper and the duct body.

Further, it is desirable that the water content of the air-conditioning duct paper when it is made wet by containing water is set in the range of 15 to 500%. This is because if the water content of the coated air-conditioning duct paper is so low as to fall below this range, the action of water on the above-mentioned interfiber bonds will be insufficient, and the increase in the elongation rate of the paper may not be sufficient accordingly. On the contrary, when the water content becomes large enough to exceed the above range, it becomes difficult to maintain the shape of the paper, the moldability decreases, and an increase in the elongation rate above one low level is not observed. This is because it takes a lot of time to dry. However, the water content of the paper means the rate of increase in the weight of the air-conditioned duct paper in the wet state with respect to the weight per unit area of the air-conditioned duct paper in the dry state.

Further, in order to further strengthen the adhesion of the air-conditioning duct paper to the duct body and prevent peeling after drying, an adhesive is used when coating the air-conditioning duct paper on the duct body. Is desirable. here,
This adhesive is applied to the duct body side because the air conditioning duct paper is in a wet state when the air conditioning duct paper is covered, but the adhesive force is impaired even if the wet paper is pasted. It is desirable to use various water-based emulsion adhesives and water-soluble paste adhesives, specifically vinyl acetate resin-based emulsion adhesives and various resin monomers, for example, It is desirable to use emulsion adhesives of copolymers of ethylene, acrylic acid ester, maleic acid ester, higher fatty acid ester and the like.

Further, when covering the air-conditioning duct paper, while sticking the moist paper on the outer periphery of the duct main body,
The paper may be made to expand and contract by hand to follow the three-dimensional curved surface, but in order to simplify the work and save labor, the wet air-conditioning duct paper is crimped by a mold. It is preferable to cover the outer circumference of the duct body. However, by being crimped by such a mold, the moist air-conditioning duct paper is sandwiched between the mold and the duct main body, and is pushed and stretched corresponding to the curved shape at the portion where the outer circumference of the duct main body is convexly expanded. Since it is expanded and compressed in a concave portion, it is easier and more uniform than the manual work, so that the sheet can be closely adhered to and covered with the duct body.

By the way, there are mainly two methods for keeping the air-conditioning duct paper wet. One is a method of applying moisture or the like to the dried air-conditioning duct paper to bring the air-conditioning duct paper into the above-mentioned wet state, thereby covering the duct body. In this case, the dried air-conditioning duct paper may be dipped in water to impregnate / apply moisture, and the duct body outer circumference may be covered with the moist air-conditioning duct paper. The dried air-conditioning duct paper may be attached to the outer periphery of the duct body first, and then the air-conditioning duct paper may be moistened by applying water or the like to cover the duct body. In particular, according to the latter method, since the paper is dry when it is attached to the duct body, there is an advantage that the paper is easy to handle.

Further, when water or the like is applied to the air-conditioning duct paper, normal temperature water may be used, or water or the like may be applied by hot water or heated steam. In this way, by adding high-temperature water and the like to make the air conditioning duct paper wet, further softening of the paper is achieved,
It is possible to more surely adhere to the outer peripheral shape of the duct body. Also, by adding a surfactant or a softening agent to the water, it is possible to improve the impregnation speed of the air-conditioning duct paper with water, etc. Also, by the action of loosening hydrogen bonds between fibers of cellulose, The flexibility of the air conditioning duct paper can be increased. In addition, when the air-conditioning duct paper is pressure-bonded to cover the outer circumference of the duct body using the mold as described above, a large number of hot water or steam can be jetted to the inner peripheral surface of the mold, that is, the surface that contacts the paper. If a hole is formed on the entire surface and hot water or steam is blown out from this hole to press the air conditioning duct paper to the outer periphery of the duct body, the work can be further simplified and the operator can use hot water. It is not necessary to directly handle steam and steam, and safety can be improved. To make this air-conditioning duct paper even more flexible and improve its expansion rate, dry air-conditioning duct paper can be embossed or the entire surface of the paper can be perforated to create innumerable small holes. Alternatively, the surface of the paper may be subjected to so-called crepe processing in which wrinkle-like wrinkles are formed, or these processings may be appropriately combined.

On the other hand, as another method for providing the moist air-conditioning duct paper, there is a method in which the undried paper after the base paper making of the air-conditioning duct paper, so-called wet paper, is used as it is. That is, paper is made into a predetermined thickness, basis weight, etc. from raw materials such as pulp through a papermaking machine in a papermaking machine, and then dried by a drying dryer integrally combined with this papermaking machine to be commercialized. It
Therefore, if the duct body is covered with the undried air-conditioning duct paper as it is before being sent to the dryer after paper making, it is not necessary to re-wet the paper that has been purposely dried, and drying by a dryer after paper making or It is possible to simplify the work process by omitting the wetting of the paper. In addition, compared to a paper that has been dried once and moistened with paper with stable hydrogen bonds between fibers, this hydrogen bond between fibers is insufficient and loose in the wet paper state. There is also an advantage that flexibility during coating is easily obtained.

[0021]

EXAMPLES The present invention will be described in detail below with reference to examples and comparative examples. All parts by weight are dry parts by weight.

Example 1 In Example 1, among various accessory air-conditioning ducts, as shown in FIGS. 1 and 2, the three-dimensional curved surface formed by the outer peripheral surface of the duct body 1 has the largest curvature. Caliber 100φ9
Using a 0 ° elbow (curved pipe) accessory air conditioning duct (press-molded product), the accessory air conditioning duct paper 2 with a thickness of 0.7 mm is attached to the outer periphery of the accessory air conditioning duct body 1. The bent portion of the air conditioning duct body 1 was covered. However, the accessory air-conditioning duct main body 1 was made of hot-dip galvanized steel sheet, and its dimensions were as follows. Caliber D …… 100mm Bending angle of the accessory air conditioning duct body 1 …… 90 degrees Bending radius of the center of the accessory air conditioning duct body R …… 1
10 mm Circumference of inner peripheral line AA of curved part of accessory air conditioning duct main body …… 94 mm Perimeter of center line BB of curved part of accessory air conditioning duct main body …… 172 mm Bend of accessory air conditioning duct main body 1 Perimeter of CC in the part of ...... 251 mm

On the other hand, the air-conditioning duct paper 2 used in Example 1 was beaten 10 parts by weight of NBKP and 10 parts by weight of LBKP, and aluminum hydroxide (trade name "B
-153 ", 70 parts by weight of Nippon Light Metal Co., Ltd. and 10 parts by weight of kaolin clay (trade name" TMC-80 ", manufactured by Zyklite Industry Co., Ltd.) are mixed, and cationic starch (trade name" Neo-Tac L- 1 ", manufactured by Nippon Shokuhin Kako Co., Ltd. 1
By weight, a fixing agent (trade name "HIH HOLDER 351", manufactured by Kurita Water Industries Co., Ltd.) of 0.05 parts by weight is added, and an absolute dry basis weight of 610 g / m ² is air-conditioned by a conventional method using a Fourdrinier paper machine. Paper was made as duct paper. The weight of the air conditioning duct paper 2 in the wet paper state is 5 times that in the dry state, so that the water content of the air conditioning duct paper 2 in the first embodiment is 50.
It was 0%. Then, such an air-conditioning duct paper 2 is cut into a rectangle corresponding to the length of the center line BB of the curved portion of the accessory air-conditioning duct main body 1, and a vinyl acetate emulsion adhesive (trade name "L- 9400 ", manufactured by Showa Highpolymer Co., Ltd., was attached to the outer periphery of the curved portion of the accessory air-conditioning duct main body 1 while being stretched or compressed and the lengths thereof were matched and adhered to the entire surface.

Here, if the length of the air-conditioning duct paper 2 is matched with the circumference of the center line BB of the curved portion of the accessory air-conditioning duct main body 1, inside the curved portion, the inner peripheral line AA thereof is obtained.
Since the perimeter of the center line BB is about 1.83 times the perimeter of the air conditioning duct paper 2, the air conditioning duct paper 2 becomes excessive, and in order to attach a normal dry air conditioning duct paper, the paper is wrinkled, You have to fold the sheets and stack them.
On the other hand, on the curved outer circumference, the circumference of the center line BB is only about 0.69 times the circumference of the outer circumference CC, and the air-conditioning duct paper 2 tends to be insufficient. 2 must be stretched about 1.46 times, and the air-conditioned duct paper in a dry state will tear the paper. On the other hand, according to the first embodiment, by covering the accessory air conditioning duct body 1 with the air conditioning duct paper 2 in a wet paper state, that is, in a state of not dried after the papermaking, the accessory air conditioning duct. At the outer periphery of the curved portion of the main body 1, it is possible to stretch the air conditioning duct paper 2 without tearing and bond it to the outer periphery of the accessory air conditioning duct body 1, and at the inner portion of the curved portion, the air conditioning duct paper 2 is appropriately used. By compressing, the accessory air conditioning duct body 1
It was possible to follow the outer peripheral shape of the above and closely adhere. It should be noted that some wrinkles were found in the inner portion as the air conditioning duct paper 2 was compressed, but by smoothing the air conditioning duct paper 2 with a spatula etc. while the air conditioning duct paper 2 was wet, this wrinkle was surrounded. It was possible to easily make a smooth curved surface shape by fusing.

Next, the accessory air conditioning duct body 1 covered with the thus moistened air conditioning duct paper 2 is dried by natural drying to obtain an accessory air conditioning duct in which the bent portion is covered with the air conditioning duct paper 2. It was In this dried state, the air-conditioning duct paper 2 was not peeled or cracked at all, and there was no gap between the air-conditioning duct paper 1 and the accessory air-conditioning duct body 1, and the air-conditioning duct paper 2 was contained in the adhesive or the air-conditioning duct paper 2. Combined with the action of the inorganic substance, the state was in close contact with the outer periphery of the accessory air conditioning duct body 1. further,
The accessory air-conditioning duct manufactured in this manner is disclosed in
An air-conditioning duct described in Japanese Patent No. 306832 was connected to a straight air-conditioning duct covered with paper, and an experiment was conducted on the occurrence of dew condensation under various temperature and humidity conditions.
Also in the accessory air-conditioning duct according to the first embodiment, substantially the same performance as the condensation resistance in the straight tubular air-conditioning duct could be obtained.

Example 2 In this Example 2, the air-conditioning duct paper produced by the same method as in Example 1 was once dried to have an absolute dry basis weight of 610 g /
A dry air-conditioning duct paper 4 having m ² and a water content of 4% was obtained.
Then, using this air-conditioning duct paper 4, the three-dimensional curved surface has a smaller curvature than the accessory air-conditioning duct main body 1 used in Example 1, and has a diameter of 100φ45 degrees elbow (bent pipe) as shown in FIGS. 3 and 4. The air-conditioning duct main body 3 (press-molded product) was covered with a bent portion. However, like the first embodiment, the accessory air-conditioning duct body 3 is made of hot-dip galvanized steel sheet, and its dimensions are as follows. Caliber D of the accessory air-conditioning duct main body θ 45 degrees Deflection radius of the center of the cross section of the accessory air-conditioning duct main body R 1
00mm Perimeter of inner peripheral line AA of the bent portion of the accessory air conditioning duct main body ... 85mm Perimeter of center line BB of the curved portion of the accessory air conditioning duct main body ... 124mm Bend of the accessory air conditioning duct main body 3 Perimeter of CC in the area of ...... 160 mm

Here, in the second embodiment, the air-conditioning duct paper 4 is dipped in water at room temperature and impregnated with water to a saturated state so as to have a water content of 50%, and then softened. In the same procedure as in Example 1, this air conditioning duct paper 4
The accessory air-conditioning duct main body 3 is cut into a rectangle matching the length of the center line BB of the curved portion, and a vinyl acetate emulsion adhesive (trade name "L-9400", manufactured by Showa Highpolymer Co., Ltd.) as an adhesive. ) Was applied to the outer periphery of the bent portion of the accessory air-conditioning duct main body 3 while adhering to the entire surface while stretching or compressing and adjusting the length.

However, if the length of the air conditioning duct sheet 4 is adjusted to the circumference of the center line BB of the curved portion of the accessory air conditioning duct main body 3 as in the first embodiment, the inside of the curved portion will be The peripheral length of the center line BB is about 1.29 times the peripheral length of the peripheral line AA, while the peripheral length of the center line BB is about 0. 68
Since the air-conditioning duct paper is doubled or deficient, the air-conditioning duct paper will be wrinkled or torn, and the air-conditioning duct paper 4 will be in close contact with the accessory air-conditioning duct. Cannot be coated. On the other hand, according to the second embodiment, the accessory air conditioning duct body 3 is covered with the accessory air conditioning duct body 3 by covering the accessory air conditioning duct body 3 with the air conditioning duct paper 4 which is made soft by containing water. It was possible to follow the outer peripheral shape of No. 3 and closely adhere to it.

Example 3 Next, as Example 3, using 3% by weight of a surfactant (trade name "Emulgen 306P", manufactured by Kao Co., Ltd.) in normal temperature water, an air conditioning duct was used. Example 2 except that the water absorption rate to the paper 4 is increased and the flexibility is increased.
When the accessory air-conditioning duct 3 is covered with the air-conditioning duct paper 4 in the same manner as described above, the rate of water absorption into the air-conditioning duct paper 4 increases, and the accessory air-conditioning duct body 3 is quickly and closely covered. Was possible.

Example 4 Furthermore, as Example 4, the accessory air conditioning duct 3 is coated with the air conditioning duct paper 4 in the same manner as in Example 2 except that hot water at 80 ° C. is used instead of water at room temperature. As a result, the rate of water absorption into the air conditioning duct paper 4 increased, and it was possible to quickly adhere to and cover the accessory air conditioning duct body 3.

Comparative Example 1 On the other hand, as Comparative Example 1, an air-conditioning duct paper produced in the same manner as in Example 1 was dried to obtain an absolute dry basis weight of 610 g /
A dry air-conditioning duct paper with m ² and a water content of 4% was obtained, and the dry air-conditioning duct paper was not impregnated into the accessory air-conditioning duct body 1 used in Example 1 with water.
It stuck in the same way as. And in the said Example 1 and this comparative example 1, the external appearance shape of the air conditioning duct paper in the three-dimensional curved surface part in the accessory air conditioning duct main body 1 is shown.
Each part was visually evaluated. The results are shown in Table 1 for Example 1 and Table 2 for Comparative Example 1. However, the evaluation criteria in Table 1 and Table 2 are the accessory air conditioning when each line of A-A, B-B, C-C, D-D, and A-C in FIG. 5 is a standard line. At each point of W, X, Y, Z on the three-dimensional curved surface portion of the duct body 1, a good state without wrinkles, slacks, etc. is indicated, a state in which some wrinkles, slacks, etc. are observed is indicated, and a remarkable wrinkle is observed. , Slackness, etc. were observed, and the state in which correction was impossible was indicated as x.

[0032]

[Table 1]

[0033]

[Table 2]

Comparative Example 2 As Comparative Example 2, the air-conditioning duct paper produced by the same method as in Example 1 was dried to obtain an absolute dry basis weight of 610 g /
A dry air-conditioning duct paper having m ² and a water content of 4% was obtained, and the dry air-conditioning duct paper was not impregnated in the accessory air-conditioning duct body 3 used in Example 2 with water.
It stuck in the same way as. And in the said Example 2 and this comparative example 2, the external shape of the air-conditioning duct paper in the three-dimensional curved surface part in the accessory air-conditioning duct main body 3 is shown.
As in the case of Example 1 and Comparative Example 1, standard lines AA, BB, CC, D- of the accessory air conditioning duct shown in FIG.
D and A-C were visually evaluated at each point W, X, Y, Z on the three-dimensional curved surface portion. The results are shown in Example 2.
Is shown in Table 3 and Comparative Example 2 is shown in Table 4. However, the evaluation criteria in Tables 3 and 4 are the same as those in the above-described Example 1 and Comparative Example 1.

[0035]

[Table 3]

[0036]

[Table 4]

From the results shown in Tables 1 to 4, in the accessory air-conditioning ducts of Comparative Example 1 and Comparative Example 2, the standard lines A- at points W, X and Y except the Z point.
Although some or uncorrectable remarkable wrinkles and slacks were observed in any of A, B-B, C-C, D-D, and A-C, the examples according to the present invention According to the accessory air-conditioning ducts according to Example 1 and Example 2, the three-dimensional curved surfaces of the accessory air-conditioning duct bodies 1 and 3 follow without wrinkling or sagging at any point with respect to any standard line. It can be seen that the air-conditioning duct papers 2 and 4 are covered. This result is considered to prove the effect of the first and second embodiments of the present invention.

[0038]

As described above, according to the present invention,
Not only straight-tube air conditioning ducts, but also accessory air conditioning ducts that have a complicated three-dimensional curved surface with bent portions, branch portions, or expanded / contracted diameter portions, without causing wrinkles or tears.
The air-conditioning duct paper can be brought into close contact with the outer periphery of the accessory air-conditioning duct main body so as to be covered without a gap. In the accessory air-conditioning duct manufactured in this manner, like the straight-tube type duct, dew condensation is suppressed by this air-conditioning duct paper, and the dew condensation water is uniformly and stably absorbed and diffused throughout the duct. In addition, it is possible to effectively prevent the harmful effects caused by the dropping of the condensed water.

Further, compared to the case where the duct is covered with the conventional glass wool or the like, the air conditioning duct manufactured in the factory or the like is used as it is in the building without performing the work at the construction site where the glass wool or the like is wound. Since it can be used by attaching it to the etc., it is possible to provide an air conditioning duct with stable quality and anti-condensation, and since a cover for covering this glass wool etc. is not required, the divergence of absorbed dew condensation water Since it does not use such glass wool, it is possible to perform construction work hygienically, and it is safe because it does not require winding work at high places. The work can be omitted, that is, it can be constructed by the same method as the duct construction method without a heat insulating material such as glass wool, and the construction period can be shortened. That it can exhibit excellent effects such as. Moreover, since the air-conditioning duct paper covering the outer circumference of the duct body is lightweight in a dry state, the labor during the construction does not increase. After cutting and punching to the specified size, the ear part can be recycled and reused, so resources can be effectively used without waste and the generation of industrial waste can be suppressed. You can also get

[Brief description of drawings]

FIG. 1 is a cutaway view of an accessory air conditioning duct having a diameter of 100φ and a bending angle of 90 degrees according to a first embodiment of the present invention.

FIG. 2 is a side view of an accessory air conditioning duct having a diameter of 100φ and a bending angle of 90 degrees according to the first embodiment of the present invention.

FIG. 3 is a cutaway view of an accessory air conditioning duct having a diameter of 100φ and a bending angle of 45 degrees according to a second embodiment of the present invention.

FIG. 4 is a side view of an accessory air conditioning duct having a diameter of 100φ and a bending angle of 45 degrees according to a second embodiment of the present invention.

FIG. 5 is a diagram showing an external appearance observation position of an accessory air conditioning duct according to Example 1 and Comparative Example 1 of the present invention.

FIG. 6 is a diagram showing an external appearance observing position of an accessory air conditioning duct according to Example 2 and Comparative Example 2 of the present invention.

[Explanation of symbols]

1 90 degree accessory air conditioning duct body with 100mmφ diameter (elbow) 2 Air conditioning duct paper 3 45 degree accessory air conditioning duct body with 100mmφ diameter (elbow) 4 Air conditioning duct paper

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Isao Otake 501, Honjuku, Nagaizumi-cho, Sunto-gun, Shizuoka Special paper manufacturing Co., Ltd. (56) Reference JP-A-5-306832 (JP, A) JP-A-6- 147623 (JP, A) JP 5-302751 (JP, A) JP 7-70992 (JP, A) JP 9-243156 (JP, A) JP 55-100499 (JP, A) JP-A-6-126876 (JP, A) JP-A-4-185995 (JP, A) Actually open Sho-58-136335 (JP, U) Actually open 5-19796 (JP, U) Actually open 5-40697 (JP, U) Actual development Sho 58-15709 (JP, U) Actual development Sho 60-143993 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F24F 13/00-13 / 18 F16L 59/00-59/22

Claims (5)

(57) [Claims] The outer periphery of claim 1] tubular duct body, after covering by the air-conditioning duct paper wet with contain water or the like, a manufacturing method of the air conditioning duct for drying the air conditioning duct sheet, the air-conditioning duct The interface in the water to moisten the paper
Characterized by the use of activators and / or softeners
Manufacturing method of air conditioning duct. 2. The outer circumference of the tubular duct body contains moisture and the like.
Covered with air-conditioned duct paper in a damp condition
After that, a method of manufacturing an air conditioning duct for drying the air conditioning duct paper.
Method, the air-conditioning duct paper in a wet state is crimped with a mold.
A method for manufacturing an air conditioning duct, characterized in that the outer circumference of the duct body is covered . 3. The outer circumference of the tubular duct body contains moisture and the like.
Covered with air-conditioned duct paper in a damp condition
After that, a method of manufacturing an air conditioning duct for drying the air conditioning duct paper.
A law, in the air conditioning duct paper dry state, hot water or heating
By adding moisture etc. by steam, the air conditioning duct
A method for manufacturing an air-conditioning duct, characterized in that the paper is kept in the wet state . 4. The outer circumference of the tubular duct body contains moisture and the like.
Covered with air-conditioned duct paper in a damp condition
After that, a method of manufacturing an air conditioning duct for drying the air conditioning duct paper.
A law, in the air conditioning duct paper dry state, embossed,
At least one of drilling and creping
The air-conditioning duct
A method for manufacturing an air-conditioning duct, characterized in that the paper is kept in the wet state . 5. The outer circumference of the tubular duct main body contains moisture and the like.
Covered with air-conditioned duct paper in a damp condition
After that, a method of manufacturing an air conditioning duct for drying the air conditioning duct paper.
After the base paper is made into the above-mentioned wet air-conditioning duct paper,
A method for manufacturing an air conditioning duct, characterized in that the undried air conditioning duct paper is used .