Painting method

Abstract

To provide a coating method that can efficiently dry a coating material in applying a coating to a prescribed surface that is provided in a prescribed space in a room.SOLUTION: A coating method includes: a coating step P5 of applying a prescribed coating material to a prescribed surface R that is provided in a prescribed space S in a room; and a coating drying step P6 of dehumidifying and heating air W1 in the prescribed space S using a dehumidifier 3 using a desiccant method at least during the coating step P5 and after the coating step P5 and directing the dehumidified and heated dry air D3 to the prescribed surface R to dry the applied coating.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a coating method. [Background technology]

[0002] Conventionally, when painting a predetermined surface such as a ceiling indoors, drying is carried out by generating airflow indoors using a large electric fan. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 4-317772 Summary of the Invention [Problem to be solved by the invention]

[0004] Indoor use is restricted until the painting process is complete, and conventional methods using large electric fans take a long time to dry. For example, in factories where painting is performed, painting is limited to long vacation periods when operations are suspended for long periods. Therefore, there is a demand for a painting method that can efficiently perform the drying process and complete the painting early, allowing painting to be completed, for example, at night.

[0005] A known method for speeding up drying in painting is a drying method for drying a coating film applied to a building material (for example, Patent Document 1). In this drying method, after applying paint to the building material, a fan blows air onto the coating film to dry the surface layer of the coating, and then a heater heats the coating film to completely dry the paint.

[0006] The drying method disclosed in Patent Document 1 uses a dedicated drying device to dry building materials. Therefore, it is impossible to dry paint on a specific surface in a specific indoor space using the method disclosed in Patent Document 1.

[0007] The present invention has been made in consideration of the above circumstances, and aims to provide a painting method that can efficiently dry paint when painting a specific surface in a specific indoor space. [Means for solving the problem]

[0008] To achieve this object, the first aspect of the present invention is a painting method comprising: a painting step of painting a predetermined paint onto a predetermined surface in a predetermined space indoors; and a paint drying step of dehumidifying and heating the air in the predetermined space using a desiccant-based dehumidifier at least during and after the painting step, and directing the dehumidified and heated air toward the predetermined surface to dry the painted paint.

[0009] A second aspect of the present invention is a coating method according to the first aspect, which further comprises a pre-painting drying step in which, before the coating step, the dehumidifier is used to dehumidify and heat the air in the specified space, and the dehumidified and heated air is directed toward the specified surface, thereby drying the surface to be coated.

[0010] A third aspect of the present invention is a coating method according to the second aspect, which further comprises a mold removal step of removing mold from the specified surface before the coating step, and the pre-coating drying step is carried out at least during the mold removal step until before the coating step, using the dehumidifier to dehumidify and heat the air in the specified space, and directing the dehumidified and heated air toward the specified surface to dry the surface that became wet in the mold removal step.

[0011] A fourth aspect of the present invention is the coating method according to the third aspect, which further comprises a pre-mold removal drying step in which, before the mold removal step, the dehumidifier is used to dehumidify and heat the air in the specified space, and the dehumidified and heated air is directed toward the specified surface, thereby drying the surface from which mold will be removed.

[0012] A fifth aspect of the present invention is a coating method according to any one of the first to fourth aspects, wherein the dehumidifier is configured so that an odor-absorbing filter can be installed on at least one of the intake side that draws in air from the specified space and the outlet side that blows out dehumidified and heated air.

[0013] In a sixth aspect of the present invention, in the painting method according to the third or fourth aspect, the dehumidifier is configured so that an odor-absorbing filter can be replaceably installed on at least one of the intake side that draws in air from the specified space and the outlet side that blows out dehumidified and heated air, and a first filter that absorbs odors generated in the mold removal process is installed at least during the pre-paint drying process, and a second filter that absorbs odors generated in the painting process is installed at least during the paint drying process.

[0014] A seventh aspect of the present invention is the coating method according to the fifth or sixth aspect, wherein the dehumidifier is configured so that a plurality of the filters can be installed in a tandem.

[0015] An eighth aspect of the present invention is a coating method according to any one of the first to seventh aspects, which includes a curing step of surrounding the specified space from ceiling to floor with a curing sheet before drying using the dehumidifier.

[0016] A ninth aspect of the present invention is the coating method according to any one of the third, fourth and sixth aspects, wherein the predetermined paint used in the coating step is a paint having an antifungal effect. [Effects of the Invention]

[0017] According to the coating method of the first aspect of the present invention, during and after the coating process in which a predetermined paint is applied to a predetermined surface in a predetermined indoor space, the air in the predetermined space is dehumidified by a desiccant-type dehumidifier, heated to a temperature higher than the temperature in the predetermined space, and then directed toward the predetermined surface. This reduces the humidity of the air near the predetermined surface, accelerating the drying of the painted surface. This has the effect of efficiently drying the paint when coating a predetermined surface in a predetermined indoor space.

[0018] The coating method according to the second aspect of the present invention achieves the following effects in addition to the effects achieved by the method according to the first aspect. That is, in the pre-coating drying step, the air in the specified space is dehumidified and heated before the coating step, and the dehumidified and heated air is applied to the specified surface. The specified surface to which the dehumidified and heated air has been applied is dried in advance before the coating step. This has the effect of ensuring that an appropriate amount of paint is adhered to the specified surface during the coating step. Furthermore, since the adhesion of the paint can be improved, it has the effect of preventing the paint from peeling off from the specified surface for a long period of time even after the coating step.

[0019] The coating method according to the third aspect of the present invention achieves the following effects in addition to the effects achieved by the method according to the second aspect. Specifically, the mold removal process removes mold that has grown on the specified surface before the coating process. This effectively suppresses mold growth on the specified surface after the coating process, thereby suppressing mold growth. Furthermore, during the mold removal process and before the coating process, the air in the specified space is dehumidified and heated to a temperature higher than the temperature in the specified space. This air is then directed toward the specified surface, accelerating the drying of the surface that became wet during the mold removal process. This effectively allows workers to quickly dry the surface that became wet during the mold removal process and begin the next step, the coating process. Furthermore, this effectively prevents poor paint adhesion caused by coating the surface while it is still wet during the coating process.

[0020] The coating method according to the fourth aspect of the present invention achieves the following effect in addition to the effect achieved by the method according to the third aspect. That is, in the pre-mold removal drying step, the air in the specified space is dehumidified and heated before the mold removal step, and the dehumidified and heated air is applied to the surface to be mold removed. This dries the surface in advance before the mold removal step. This has the effect of allowing the chemicals used in the mold removal step to spread to the mold spores and hyphae that have developed on the surface.

[0021] The coating method according to the fifth aspect of the present invention achieves the following effect in addition to the effects achieved by the methods according to the first to fourth aspects: odors in a specified space are adsorbed by a filter installed on at least one of the inlet and outlet sides of a desiccant-type dehumidifier. This adsorbs odors generated during the coating process, so that the desiccant-type dehumidifier can dry a specified surface while simultaneously removing odors from the specified space.

[0022] The coating method according to the sixth aspect of the present invention achieves the following effect in addition to the effects achieved by the methods according to the third or fourth aspect. That is, a replaceable filter is installed on at least one of the inlet side and outlet side of a desiccant-type dehumidifier. The second filter is installed at least during the pre-paint drying process, and the first filter is installed at least during the paint drying process. As a result, odors generated in the mold removal process are adsorbed by the second filter, and odors generated in the coating process are adsorbed by the first filter. Therefore, filters suitable for removing odors generated in each process can be used, resulting in the effect of reliably removing odors generated within a specified space in each process.

[0023] The coating method according to the seventh aspect of the present invention has the following effect in addition to the effects of the methods according to the fifth or sixth aspects: By arranging multiple filters in a vertical row, the air in a specified space passes through the multiple filters, and odors are adsorbed. This has the effect of more reliably removing odors from the specified space.

[0024] The coating method according to the eighth aspect of the present invention achieves the following effect in addition to the effects achieved by the methods according to any one of the first to seventh aspects. That is, the predetermined space is enclosed by the protective sheet from ceiling to floor. This has the effect of efficiently dehumidifying and drying only the air in the predetermined space. Furthermore, the protective sheet keeps odors generated during the coating process within the predetermined space. This has the effect of preventing the odor from leaking outside the predetermined space.

[0025] The coating method according to the ninth aspect of the present invention has the following effect in addition to the effects of the methods according to any one of the third, fourth, and sixth aspects: the antifungal paint prevents re-adhesion of mold after removal in the mold removal step, thereby preventing mold growth for a long period of time even after coating. [Brief explanation of the drawings]

[0026] [Figure 1] FIG. 2 is a schematic diagram showing the drying of a predetermined surface to be painted by a desiccant dehumidifier. [Figure 2] 1 is a schematic diagram of a desiccant dehumidifier used in a coating method according to an embodiment of the present invention. [Figure 3] 1 is a diagram showing the flow of each step of a coating method according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0027] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Each of the embodiments described below represents a preferred specific example of the present invention. Therefore, the numerical values, shapes, materials, components, component placement positions, and connection configurations shown in the following embodiments are merely examples and are not intended to limit the present invention. Therefore, among the components in the following embodiments, components that are not recited in the independent claims that represent the highest concept of the present invention will be described as optional components. Furthermore, in each drawing, substantially identical components are designated by the same reference numerals, and redundant descriptions will be omitted or simplified.

[0028] First, a desiccant dehumidifier 3 used in a coating method according to one embodiment of the present invention will be described with reference to Figures 1 and 2. Figure 1 is a schematic diagram showing the drying of a predetermined surface R on which coating is to be performed by the desiccant dehumidifier 3, and Figure 2 is a schematic diagram of the desiccant dehumidifier 3 used in the coating method according to an embodiment of the present invention.

[0029] As shown in FIG. 1 , room 1 (hereinafter simply referred to as “room 1”) to be painted is a box-shaped space located inside a building, and has a ceiling 21, walls 22, and a floor 23. In the painting method according to this embodiment, a protective sheet 8 is laid extending from the ceiling 21 to the floor 23 so as to surround the surface to be painted (hereinafter referred to as “predetermined surface R”; FIG. 1 shows the predetermined surface R defined on the ceiling 21) of the ceiling 21, wall 22, or floor 23. In this painting method, an intake duct 31 that draws air W1 from the predetermined space S into a desiccant dehumidifier 3 and an exhaust duct 32 that exhausts dry air D3 dehumidified and heated by the desiccant dehumidifier 3 toward the predetermined surface R are installed in the space surrounded by the protective sheet 8 within room 1 (hereinafter referred to as “predetermined space S”).

[0030] The desiccant dehumidifier 3 is installed outside the room 1 and is a device that dehumidifies and heats the air W1 in the specified space S and directs the dehumidified and heated dry air D3 toward the specified surface R, thereby drying the specified surface R on which painting will be performed. Note that in this embodiment, a hybrid desiccant dehumidifier 3 that combines a compressor system and a desiccant system will be used for explanation.

[0031] The desiccant dehumidifier 3 is configured with two passages, an upper passage and an lower passage, and includes a regeneration passage 41 located in the lower passage of the main body 30 and a dehumidification passage 42 located in the upper passage of the main body 30.

[0032] The regeneration passage 41 is a passage for passing the air W1, the air W2, and the air W3 through a regeneration zone 6a of the desiccant rotor 6, which will be described later. The regeneration passage 41 is connected to the suction port 33 on the upstream side and to the dehumidification passage 42 on the downstream side.

[0033] The dehumidification passage 42 is a passage for passing the dry air D1, dry air D2, and dry air D3 through the dehumidification zone 6b of the desiccant rotor 6. The dehumidification passage 42 is connected to the regeneration passage 41 on the upstream side and to the air outlet 34 on the downstream side. A cooler 54 is provided at the connection position between the regeneration passage 41 and the dehumidification passage 42 to cool the air W3 that has become highly humid in the regeneration passage 41.

[0034] The desiccant dehumidifier 3 also includes a desiccant rotor 6 that spans the regeneration passage 41 and the dehumidification passage 42. The regeneration passage 41 includes a suction fan 51 and a regeneration heater 52 upstream of the desiccant rotor 6. The dehumidification passage 42 includes a reheat heater 56 downstream of the desiccant rotor 6. The desiccant dehumidifier 3 also includes a compressor 53 and an expansion valve 55. The regeneration heater 52, the compressor 53, the cooler 54, and the expansion valve 55 are connected by a circulation path, and a refrigeration cycle 50 is formed thereby.

[0035] The suction port 33 is connected to the intake duct 31 and is a member for taking in the air W1 sucked from the predetermined space S via the intake duct 31 into the regeneration passage 41 formed in the main body 30.

[0036] The air outlet 34 is connected to the exhaust duct 32 and is a member for blowing out the dry air D3 dehumidified and heated in the main body 30 via the exhaust duct 32 from the dehumidification passage 42 into the specified space S. As described above, the tip of the exhaust duct 32 is arranged to face the specified surface R of the specified space S, and the dehumidified and heated dry air D3 blown out from the air outlet 34 is blown out by the exhaust duct 32 toward the specified surface R.

[0037] The desiccant rotor 6 is a disk-shaped rotor having a honeycomb structure carrying adsorbent 61 that adsorbs moisture in the dry air D1. The desiccant rotor 6 is arranged in the main body 30 with its disk surface oriented perpendicular to the regeneration passage 41 and the dehumidification passage 42 so that the adsorbent 61 intersects with the regeneration passage 41 and the dehumidification passage 42. The adsorbent 61 can be made of either an inorganic or organic material; for example, inorganic materials such as silica gel, zeolite, and titanium oxide are used, and organic materials such as water-absorbent polymers and temperature-sensitive polymers are used.

[0038] The desiccant rotor 6 is positioned so that its rotation axis 6d is located on the boundary between the regeneration passage 41 and the dehumidification passage 42. As a result, the lower half of the desiccant rotor 6 is located in the regeneration passage 41, and the upper half is located in the dehumidification passage 42. The zone of the desiccant rotor 6 located in the dehumidification passage 42 is called the dehumidification zone 6b. The dehumidification zone 6b brings the dry air D1 passing through the dehumidification passage 42 into contact with the adsorbent 61, causing the moisture contained in the dry air D1 to be adsorbed by the adsorbent 61, thereby further dehumidifying and drying the dry air D1 to produce dry air D2. The zone of the desiccant rotor 6 located in the regeneration passage 41 is called the regeneration zone 6a. The regeneration zone 6a regenerates the adsorbent 61 by releasing the moisture adsorbed by the adsorbent 61 into the heated air W2.

[0039] The desiccant rotor 6 rotates at a constant speed around the rotation axis 6d driven by a motor (not shown). The adsorbent 61, which has adsorbed moisture while positioned in the dehumidification zone 6b for a predetermined time while rotating, moves to the regeneration zone 6a. The adsorbent 61 moves to the regeneration zone 6a and remains there for a predetermined time while rotating. During this time, the adsorbent 61 is regenerated by releasing the adsorbed moisture into the air W2 flowing through the regeneration passage 41. The regenerated adsorbent 61 moves to the dehumidification zone 6b while rotating. The adsorbent 61 moves to the dehumidification zone 6b and remains there for a predetermined time while rotating, adsorbing moisture contained in the dry air D1 flowing through the dehumidification passage 42 to dehumidify the dry air D1. In this way, the desiccant dehumidifier 3 repeatedly regenerates and dehumidifies the adsorbent 61 through the rotation of the desiccant rotor 6.

[0040] The suction fan 51 is a member that draws air W1 from the specified space S into the main body 30 through the suction port 33 and generates an air flow from the regeneration passage 41 to the dehumidification passage 42. The suction fan 51 is located between the suction port 33 and the regeneration heater 52.

[0041] The regeneration heater 52 is a heating device that heats the air W1 sucked in through the suction port 33 to turn it into air W2 in order to regenerate the adsorbent 61 of the desiccant rotor 6 that has adsorbed moisture. The heated air W2 passes through the regeneration zone 6a of the desiccant rotor 6 located downstream of the regeneration heater 52, thereby evaporating the moisture adsorbed to the adsorbent 61 located in the regeneration zone 6a. As a result, the air W2 becomes high-humidity air W3.

[0042] The compressor 53 is a device for compressing the refrigerant circulating within the refrigeration cycle 50 to make it high temperature and high pressure. The expansion valve 55 is a device for decompressing the high pressure refrigerant sent from the regeneration heater. The high temperature and high pressure refrigerant compressed by the compressor 53 is supplied to the regeneration heater 52, where the heat of the refrigerant is released. The refrigerant from which the heat has been released by the regeneration heater 52 is decompressed by the expansion valve 55 to become a low temperature and low pressure liquid and is supplied to the cooler 54.

[0043] The cooler 54 is a cooling device for cooling the high-humidity air W3 that has passed through the regeneration zone 6a of the desiccant rotor 6. The high-humidity air W3 is cooled by the cooler 54, causing the moisture contained in the air W3 to condense. As a result, the high-humidity air W3 is dehumidified and becomes dry air D1, which flows into the dehumidification passage 42. The refrigerant in the cooler 54 vaporizes by removing heat from the high-humidity air W3, and is returned to the compressor 53 and circulated again.

[0044] The reheat heater 56 is a heating device such as an electric heater that heats the dry air D2 that has passed through the dehumidification zone 6b of the desiccant rotor 6 to produce dry air D3. The dry air D3, whose relative humidity has been further reduced by the reheat heater 56, is blown out toward a predetermined surface R of the predetermined space S from the exhaust duct 32 connected to the air outlet 34.

[0045] The air inlet 33 is removably provided with a filter 7 that removes odors generated in the mold removal process P3 and the painting process P5, which will be described later. Different filters 7 are used depending on the type of odor to be removed. For example, the second filter 72 is used for the chlorine odor generated by the chemicals used in the mold removal process P3, and the first filter 71 is used for the thinner odor generated by the paint used in the painting process P5. By using different filters 7 depending on the type of odor to be removed, the target odor can be reliably removed. The air inlet 33 is also configured to accommodate multiple filters 7 (e.g., three filters). Using multiple filters 7 can more reliably remove odors. Of the three filters that make up the first filter 71, at least two filters made of different materials may be combined. This allows for more reliable removal of various odor components than when the first filter 71 is configured using three filters made of the same material. While the filter 7 is removably provided in the air inlet 33 in this embodiment, it may also be provided inside the intake duct 31. The filter 7 may also be provided inside the air outlet 34 or the exhaust duct 32.

[0046] The protective sheet 8 is a resin sheet that prevents some of the paint used in the painting process P5 from scattering during painting and adhering to areas other than the designated surface R, and also prevents odors emitted from the paint from leaking into spaces other than the designated space S. For this reason, work is carried out with the protective sheet 8 in place from the pre-mold removal drying process P2 to the paint drying process P6, which will be described later.

[0047] Next, a coating method according to this embodiment using the desiccant dehumidifier 3 configured as above will be described with reference to Fig. 3. Fig. 3 is a diagram showing the flow of each step of the coating method according to this embodiment.

[0048] (Curing process P1) First, before starting the desiccant dehumidifier 3, the worker performs a curing step P1 as a preliminary preparation for efficiently drying the predetermined surface R provided in the predetermined space S in the room 1.

[0049] As shown in FIG. 1 , a worker installs a protective sheet 8 from the ceiling 21 to the floor 23 in the room 1 to surround a predetermined surface R. The predetermined surface R is surrounded by the protective sheet 8, and the enclosed space forms a predetermined space S. The predetermined space S is connected to the desiccant dehumidifier 3 via an intake duct 31 and an exhaust duct 32. Air W1 in the predetermined space S circulates between the predetermined space S and the desiccant dehumidifier 3. In this way, the protective sheet 8 efficiently dehumidifies only the air W1 in the predetermined space S and dries the predetermined surface R. The protective sheet 8 also retains odors generated during the mold removal process P3 and the painting process P5 (described later) within the predetermined space S and prevents the odors from leaking outside the predetermined space S. If visible water droplets are present on the predetermined surface R, the worker should wipe them off before installing the protective sheet 8. This allows the predetermined surface R to dry more efficiently.

[0050] (Drying process P2 before mold removal) Next, before carrying out the mold removal process P3, the worker carries out a pre-mold removal drying process P2 as a preliminary preparation to ensure that the chemicals used to remove the mold reach the mold hyphae that are deep-rooted inside the specified surface R without being diluted by moisture adhering to the specified surface R.

[0051] The operator attaches three types of second filters 72 to the suction port 33 and starts the desiccant dehumidifier 3 (T1 in FIG. 3). Here, the operation of the desiccant dehumidifier 3 will be described. The desiccant dehumidifier 3 uses the suction fan 51 to draw air W1 from the predetermined space S through the intake duct 31. The drawn air W1 flows into the regeneration passage 41 inside the main body 30. The regeneration heater 52, located upstream of the regeneration passage 41, heats the air W1 flowing through the regeneration passage 41 to produce high-temperature air W2. As this air W2 passes through the regeneration zone 6a of the desiccant rotor 6, the moisture adsorbed by the adsorbent 61 is released, and the adsorbent 61 is regenerated. As a result, the air W2 becomes high-humidity air W3 after passing through the regeneration zone 6a of the desiccant rotor 6. The cooler 54 then cools the high-humidity air W3, condensing the moisture contained in the air W3 and dehumidifying the air W3 to produce dry air D1. The desiccant rotor 6 passes the dry air D1 through the dehumidification zone 6b, where the moisture in the dry air D1 is adsorbed by the adsorbent 61, further dehumidifying the dry air D1 to produce dry air D2. The reheat heater 56, located downstream of the dehumidification zone 6b of the desiccant rotor 6, heats the dry air D2 to generate dry air D3 with a reduced relative humidity. The desiccant dehumidifier 3 discharges the generated dry air D3 from the exhaust duct 32 toward the specified surface R of the specified space S. This reduces the humidity of the air near the specified surface R, pre-drying the specified surface R before the mold removal process. This allows the chemicals used in the mold removal process P3 to reach the mold spores and hyphae that have developed on the dried specified surface R.

[0052] (Mold removal process P3) Next, the worker dries the predetermined surface R in the pre-mold removal drying step P2, and then performs the mold removal step P3 to remove mold that has grown on the predetermined surface R.

[0053] The mold removal method involves applying a chemical agent containing sodium hypochlorite as a main ingredient to the area where mold has grown, thereby sterilizing the mold on the surface. After applying the chemical agent, the worker leaves it for a certain period of time until the chemical agent reaches the mold mycelium present inside the specified surface R, allowing the chemical agent to penetrate the mold. This sterilizes the mold on the specified surface R, and bleaches the stains caused by the mold pigments adhering to the specified surface R. Furthermore, mold growth on the specified surface R is suppressed even after the painting process P5, and ultimately mold occurrence on the specified surface R is suppressed. After the chemical agent has penetrated the mold, the worker wipes off the chemical agent applied to the specified surface R.

[0054] (Drying process before painting P4) Next, while the mold removal process P3 is being performed, and from after the mold removal process P3 until the start of the painting process P5, the worker dries the specified surface R that has become wet due to the application of the chemicals, and performs the pre-painting drying process P4 as a preliminary preparation for efficiently performing the next painting process P5.

[0055] The intake fan 51 draws air W1 from the designated space S through the intake duct 31 and directs the drawn air W1 into the regeneration passage 41 within the main body 30. Three types of second filters 72 installed at the intake port 33 of the main body 30 adsorb and eliminate the chlorine odor generated by the chemicals used in the mold removal process P3. This allows the second filters 72 to reliably eliminate the odor generated in the designated space S during the mold removal process P3. Similarly to the operation of the desiccant dehumidifier 3 described above in the pre-mold removal drying process P2, the desiccant dehumidifier 3 passes the odor-removed air W1 through the regeneration passage 41 and dehumidification passage 42 to dehumidify and heat it, and then blows it out as dried air D3 from the exhaust duct 32 toward the designated surface R in the designated space S. This quickly dries the designated surface R that became wet during the mold removal process P3. In addition, the worker can dry the specified surface R that became wet during the mold removal process P3 before starting the next process, the painting process P5, which prevents the paint from adhering poorly to the specified surface R that is still wet during the painting process P5.

[0056] (Painting process P5) Next, the worker dries the predetermined surface R in the pre-painting drying step P4, and then performs the painting step P5 in which paint is applied to the predetermined surface R to prevent the re-adhesion of mold.

[0057] The paint used to paint the specified surface R is a paint with anti-mold properties. This prevents mold from re-adhering after removal in the mold removal step P3, and also prevents mold from growing on the specified surface R for a long period after painting. In addition, the paint used in the painting step P5 contains volatile organic compounds (e.g., thinner), which causes an odor after painting.

[0058] (Paint drying process P6) Next, during and after the painting step P5, the worker performs a paint drying step P6 in which the predetermined surface R that has become wet by painting is dried.

[0059] The worker replaces all three types of second filters 72 attached to the air intake 33 with three types of first filters 71 (T2 in FIG. 3). The intake fan 51 draws air W1 from the designated space S through the air intake duct 31 and directs it to the regeneration passage 41 inside the main body 30. The three types of first filters 71 attached to the air intake 33 of the main body 30 remove odors generated from the paint used in the painting process P5. As a result, the first filters 71 adsorb odors generated during the painting process P5 and reliably remove the odors from the designated space S. Similarly to the operation of the desiccant dehumidifier 3 described in the pre-mold removal drying process P2, the desiccant dehumidifier 3 passes the odor-removed air W1 through the regeneration passage 41 and dehumidification passage 42 to dehumidify and heat it, and then blows it out as dry air D3 from the exhaust duct 32 toward the designated surface R in the designated space S. As a result, the designated surface R that became wet during the painting process P5 is quickly dried.

[0060] The coating method according to one embodiment of the present invention described above provides the following advantageous effects.

[0061] In this embodiment, at least during the paint drying step P6, the dehumidified and heated dry air D3 using the desiccant dehumidifier 3 is directed toward the specified surface R in the specified space S, thereby reducing the humidity of the air near the specified surface R and promoting drying of the painted specified surface R. This allows the paint to be dried efficiently when painting the specified surface R provided in the specified space S in the room 1.

[0062] Furthermore, in this embodiment, starting from the pre-painting drying step P4 before the painting step P5, the desiccant dehumidifier 3 is used to direct dehumidified and heated dry air D3 toward the predetermined surface R in the predetermined space S, thereby pre-drying the predetermined surface R before the painting step P5. This ensures that an appropriate amount of paint adheres to the predetermined surface R during the painting step P5. Furthermore, since the paint adhesion can be improved, peeling of the paint from the predetermined surface R can be suppressed for a long period of time even after the painting step P5.

[0063] Furthermore, in this embodiment, mold that has grown on the predetermined surface R before the painting process P5 is removed by the mold removal process P3. This has the effect of suppressing mold growth on the predetermined surface R after the painting process P5, and ultimately suppressing mold occurrence. Furthermore, by directing dehumidified and heated dry air D3 toward the predetermined surface R in the predetermined space S using the desiccant dehumidifier 3 from the time the mold removal process P3 is performed until the start of the painting process P5, the drying of the predetermined surface R that became wet during the mold removal process P3 is accelerated. This allows the worker to quickly dry the predetermined surface R that became wet during the mold removal process P3 and begin the next process, the painting process P5. Furthermore, this also prevents poor paint adhesion caused by painting the predetermined surface R while it is still wet during the painting process P5.

[0064] Furthermore, in this embodiment, from the start of the pre-mold removal drying step P2 before the mold removal step P3, the dehumidified and heated dry air D3 using the desiccant dehumidifier 3 is directed toward the specified surface R in the specified space S, thereby drying the specified surface R in advance before the mold removal step P3. This allows the chemicals used in the mold removal step P3 to be widely distributed, even to the mold spores and hyphae that have developed on the specified surface R.

[0065] In this embodiment, a filter 7 that adsorbs odors is installed on at least one of the inlet 33 side and the outlet 34 side of the desiccant dehumidifier 3. This adsorbs odors generated in the painting process P5 and the mold removal process P3. This allows the desiccant dehumidifier 3 to dry the specified surface R while also removing odors from the specified space S.

[0066] In this embodiment, a first filter 71 and a second filter 72 that adsorb odors are replaceably installed on at least one of the inlet 33 side and the outlet 34 side of the desiccant dehumidifier 3. The second filter 72 is installed at least during the pre-painting drying process P4. This allows it to adsorb odors generated in the mold removal process P3 and reliably remove odors from the predetermined space S. The first filter 71 is installed at least during the paint drying process P6. This allows it to adsorb odors generated in the painting process P5 and reliably remove odors from the predetermined space S. Therefore, a filter 7 suitable for removing odors generated in each process can be used, thereby reliably removing odors generated in the predetermined space S in each process.

[0067] Furthermore, in this embodiment, multiple filters 7 are installed in a vertical row on at least one of the inlet 33 side and the outlet 34 side of the desiccant dehumidifier 3. As a result, the air in the specified space passes through the multiple filters 7 and odors are adsorbed. This makes it possible to more reliably remove odors from the specified space S.

[0068] Furthermore, in this embodiment, before the predetermined surface R is dried by the desiccant dehumidifier 3, the predetermined space S is surrounded by a protective sheet 8 from ceiling to floor, thereby efficiently dehumidifying and heating only the air W1 in the predetermined space S surrounded by the protective sheet 8. Furthermore, the protective sheet 8 keeps odors generated in the painting process P5 and the mold removal process P3 within the predetermined space S. This prevents the odors from leaking outside the predetermined space S.

[0069] In addition, in this embodiment, the paint used in the painting process P5 is a paint with anti-mold properties, which prevents mold from re-adhering to the specified surface R after it has been removed in the mold removal process P3. This makes it possible to prevent mold from growing for a long period of time after painting.

[0070] Although the present invention has been described above based on the embodiments, it is readily apparent that the present invention is not limited to the above embodiments, and various improvements and modifications are possible within the scope of the present invention. For example, each embodiment may be modified by adding or replacing a part or parts of the configuration of another embodiment, including the modifications described below. Furthermore, the numerical values ​​given in the above embodiments are merely examples, and other numerical values ​​may of course be adopted.

[0071] In the above embodiment, the predetermined surface R to be painted is the ceiling 21, but is not limited to this and may be the wall 22 or the floor 23.

[0072] Furthermore, in the above embodiment, the desiccant dehumidifier 3 is installed outside the room 1, but it may also be installed inside the room 1. In this case, there is no need to provide the intake duct 31 and the exhaust duct 32, and it is sufficient that the desiccant dehumidifier 3 is installed inside the room 1 so that the air outlet 34 faces the predetermined surface R of the predetermined space S.

[0073] Furthermore, in the above embodiment, the designated surface R is dried using the desiccant dehumidifier 3 during the pre-mold removal drying process P2, the pre-painting drying process P4, and the paint drying process P6. However, it is sufficient to efficiently dry the designated surface R at least after the painting process P5, and the desiccant dehumidifier 3 may be activated only during the paint drying process P6.

[0074] In addition, in the above embodiment, a second filter 72 is used to adsorb the chlorine odor generated from the chemicals used in the mold removal process P3, but if an odor other than the chlorine odor is generated in the mold removal process P3, a second filter 72 that adsorbs the odor other than the chlorine odor may be used.

[0075] In addition, in the above embodiment, a first filter 71 is used to absorb the thinner odor generated from the paint used in the painting process P5, but if an odor other than the thinner odor is generated in the painting process P5, a first filter 71 that absorbs the odor other than the thinner odor may be used.

[0076] Furthermore, in the above embodiment, painting is performed using paint with anti-mold effects in the painting process P5, but this is not limited to this, and even when painting is performed using paint with effects other than anti-mold (for example, antibacterial effects), the specified surface R can be dried efficiently after painting.

[0077] Furthermore, the desiccant dehumidifier 3 in the above embodiment uses a hybrid system that combines a compressor system and a desiccant system, but this is not limited to this, and as long as it can dry the specified surface R, it may also be a dehumidifier that uses only the desiccant system.

[0078] Furthermore, in the desiccant dehumidifier 3 of the above embodiment, three filters 7 are installed at the suction port 33, but this is not limitative and any number may be used. By installing multiple filters 7, the effect of removing odors generated in the mold removal process P3 and the painting process P5 can be further improved.

[0079] Furthermore, in the desiccant dehumidifier 3 of the above embodiment, the filter 7 is installed on at least one of the suction port 33 side and the outlet 34 side, but this is not limiting, and the filter 7 may be installed on both the suction port 33 side and the outlet 34 side. By installing the filter 7 on both the suction port 33 side and the outlet 34 side, the effect of removing odors generated in the mold removal process P3 and the painting process P5 can be further improved. [Explanation of symbols]

[0080] 1 room 21 Ceiling 22 Wall 23 beds 3. Desiccant dehumidifier 30 Main Unit 31 Intake duct 32 Exhaust duct 33 Intake port 34 Air outlet 41 Regeneration passage 42 Dehumidification passage 50 Refrigeration cycle 51 Intake fan 52 Regenerative heater 53 Compressor 54 Cooler 55 Expansion valve 56 Reheater 6 Desiccant Rotor 61 Adsorbent 6a Regeneration Zone 6b Dehumidification Zone 6c Boundary 6d rotation axis 7 Filters 8. Protective sheet P1 Curing process P2 Drying process before mold removal P3 Mold removal process P4 Drying process before painting P5 Painting process P6 Paint drying process

Claims

1. a pre-painting drying process in which, before painting a predetermined paint on a predetermined surface in a predetermined indoor space, the air in the predetermined space is dehumidified and heated using a desiccant-type dehumidifier, and the dehumidified and heated air is directed toward the predetermined surface, thereby drying the surface to be painted; a coating step of coating the predetermined surface with the predetermined paint; and a paint drying step of dehumidifying and heating the air in the specified space using the dehumidifier at least during and after the painting step, and directing the dehumidified and heated air toward the specified surface to dry the applied paint.

2. a mold removal step of removing mold from the predetermined surface before the painting step; 2. The painting method according to claim 1, wherein the pre-painting drying process is carried out at least during the mold removal process until before the painting process, and the dehumidifier is used to dehumidify and heat the air in the specified space, and the dehumidified and heated air is directed toward the specified surface to dry the surface that became wet in the mold removal process.

3. 3. The coating method according to claim 2, further comprising a pre-mold removal drying step in which, before the mold removal step, the dehumidifier is used to dehumidify and heat the air in the specified space, and the dehumidified and heated air is directed toward the specified surface, thereby drying the surface from which mold is to be removed.

4. A painting process of painting a predetermined paint on a predetermined surface provided in a predetermined space indoors; a paint drying process in which, at least during and after the painting process, the air in the specified space is dehumidified and heated using a desiccant-type dehumidifier, and the dehumidified and heated air is directed toward the specified surface, thereby drying the painted paint; The dehumidifier is configured so that an odor-absorbing filter can be installed on at least one of the inlet side that draws in air from the specified space and the outlet side that blows out dehumidified and heated air.

5. The dehumidifier is configured so that an odor-absorbing filter can be replaceably installed on at least one of an inlet side that draws in air from the specified space and an outlet side that blows out dehumidified and heated air, a first filter for absorbing odors generated in the mold removal process is installed at least during the pre-painting drying process; 3. The coating method according to claim 2, further comprising providing a second filter for absorbing odors generated during the coating process at least during the paint drying process.

6. The coating method according to claim 4 or 5, wherein the dehumidifier is configured so that a plurality of the filters can be installed in a tandem arrangement.

7. 6. The coating method according to claim 1, further comprising a curing step of surrounding the predetermined space from ceiling to floor with a curing sheet before drying with the dehumidifier.

8. 3. The coating method according to claim 2, wherein the predetermined paint used in the coating step is a paint having an antifungal effect.

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