Drying equipment

Abstract

To provide a hot air type drying device capable of generating hot air of a desired temperature with high energy efficiency by heating outside air (introduced air) by exhaust hot air, and constructing a heat exchanger by using a long exhaust passage and a long introduced air passage.SOLUTION: The hot air type drying device is constituted so that an exhaust passage and an introduction air passage are provided side by side, a heat exchange structure is applied to the side-by-side passage part, a heat exchange heating part for heating the introduction air is provided in the passage in a state of being interposed, and the introduction air is heated by heat exchange heating by exhaust hot air passing from a reverse direction, and the heated introduction air is branched from the introduction air passage and further heated to generate and send hot air of a desired temperature.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a drying device that is provided in a coating device configured to transport a film-like object to be coated (substrate) toward a nozzle section that discharges a coating liquid from, for example, a slit-shaped tip discharge hole, thereby coating and forming a thin film (coating film) on the surface.The present invention relates to a hot air drying device that transports and passes the film-like substrate after coating through a drying chamber section that is configured to heat it with hot air, thereby drying the coating film on the surface of the substrate. [Background technology]

[0002] The hot air drying device installed in the coating device transports and passes through a film-like substrate, on whose surface a coating liquid has been applied by the coating device and which is discharged from the coating device, and dries the coating film on the surface of the substrate using hot air and heat from an additional heater unit.

[0003] Such hot air drying devices are configured to have a long drying chamber length, with multiple drying chamber sections connected to the left and right of a main body section (divided drying chamber forming sections) that transport and pass a film-like substrate through transport inlet / outlet sections provided on the left and right.In each drying chamber forming section that makes up this drying chamber section, for example, a number of support rolls are installed in parallel in the horizontal direction, and the film-like substrate is passed over these support rolls.The film-like substrate is then taken up and transported horizontally, while the coated surface (coating film) of the substrate is dried using hot air from a hot air delivery section and the heat of a further heater section (support roll drying method), or hot air delivery sections are provided above and below, and the substrate is transported and passed without contact, while being dried using hot air from these upper and lower hot air delivery sections (floating drying method).

[0004] In addition, such a hot air type drying device is configured to include a hot air generating section that sends hot air heated to a desired temperature to the hot air delivery section provided in the drying chamber.

[0005] If this hot air generating section were simply configured to heat the intake air (outside air) drawn in by the air blowing section (draw-in fan) in a heater section to generate hot air, which is then blown out to the hot air delivery section, a large amount of heating energy would be required and efficiency would be low. Therefore, it has been proposed to configure the drying chamber so that, for example, all or part of the exhaust hot air from the drying chamber is branched off from the exhaust pipe and circulated, and this is reheated or mixed with the drawn-in outside air to generate hot air of the desired temperature, which is then sent back to the hot air delivery section of the drying chamber.

[0006] However, depending on the coating liquid applied to this substrate, there is a risk of generating dangerous gases such as flammable gases during drying, and as a result, the exhaust hot air may contain such dangerous gases in concentrations greater than dangerous levels, making it impossible to circulate the exhaust hot air exhausted from the drying chamber sufficiently. In this case, the mixed hot air, which is a mixture of the exhaust hot air and outside air, must be further heated to a predetermined required temperature (desired temperature). However, if the degree of circulation of the exhaust hot air is reduced for safety reasons, it is necessary to heat it using a heater section (heating section for temperature adjustment) until it reaches the desired temperature (final adjustment heating), which also results in poor energy efficiency.

[0007] Therefore, it is preferable to heat the air introduced from outside and then mix this heated air with a portion of the exhaust hot air.

[0008] On the other hand, it has been proposed that the heat source of the inlet air heating and generating section of the hot air generating section that heats the inlet air (such as a heat exchange heating section or the temperature adjustment heating section that further heats the mixed hot air) can be a steam-type heat exchanger in which steam heated by a boiler is passed through a heat exchange tube, and the inlet air and mixed hot air are blown through this tube to be heated by heat exchange via water vapor (steam-type heat exchanger).

[0009] However, in recent years, there has been an increasing demand to reduce CO2 emissions to prevent global warming, and there is also a growing demand to heat the hot air from the drying equipment using an electric heater rather than using a steam heat exchanger that requires boiler heating, or to use heat exchange heating using exhaust hot air at least for heating (preheating) the air before it is introduced, in order to improve energy efficiency.

[0010] Therefore, while working on research and development of a new configuration for the hot air generation section of a drying apparatus that would solve these problems while also meeting these various environmental demands, the applicant discovered the following: energy efficiency can be increased by using exhaust hot air when preheating the intake air in a heat exchanger; environmental friendliness can be improved by not using a steam heat exchanger but rather boiler heating for at least heating the intake air; and if a heat exchanger using a heat transfer fin or other heat exchange structure that heats the intake air using the heat of the exhaust hot air is used, even if the heat exchange heating degree is low, the heat exchange heating degree can be increased overall by configuring a wide range of heat exchange structures with sufficient heat exchange surface area and length and sequentially heat-exchanging and heating them in a continuous or multiple series configuration; and further, since the drying apparatus is long, and the exhaust path for the exhaust hot air and the intake air path for the intake air are also long, using each of these paths (ducts) to, for example, install them in series or in a multiple-unit configuration will result in extremely high efficiency and practicality, which led to the creation of the present invention. [Prior art documents] [Patent documents]

[0011] [Patent Document 1] Japanese Patent Publication No. 2020-118363 [Patent Document 2] Japanese Patent Publication No. 2022-163891 Summary of the Invention [Problem to be solved by the invention]

[0012] The present invention solves such conventional problems and also satisfies various demands. The hot air of a desired temperature sent to the hot air delivery section of the drying chamber is generated to the desired temperature by mixing with heated introduced air heated by heat exchange heating with exhaust hot air, or by further mixing with a part of the exhaust hot air, or by final heating by an adjustment heating section, and sent to the hot air delivery section of the drying chamber. Therefore, it is possible to meet the demand for CO2 reduction and realize an environmentally friendly drying device. In addition, the drawn-in introduced air is heat-exchange heated with the exhaust hot air, and this heat exchange heating section is connected, for example, to the exhaust path of the exhaust hot air and the introduction air path of the introduced air. The object of the present invention is to provide a hot air type drying device equipped with a hot air generating section that is excellent in safety, as it can generate hot air of a desired temperature efficiently, is environmentally friendly, and has excellent practicality, and even if the drying device is used to dry a coating film that may produce dangerous gases such as flammable gases during drying, it can generate hot air of a desired temperature efficiently by heating external air (introduced air) with the exhaust hot air and, for example, further mixing it with part of the exhaust hot air or further heating it finally, without circulating the exhaust hot air contained therein, even if the degree of circulation is low. [Means for solving the problem]

[0013] The gist of the present invention will be explained with reference to the accompanying drawings.

[0014] The present invention provides a drying device in which a film-like substrate 2, which has been coated with a coating liquid by a coating device 1 and is delivered from the coating device, is transported and passed through a drying chamber 3, and a hot air delivery section 4 is provided in the drying chamber 3, from which hot air a is delivered for drying the coated surface of the substrate 2 coated with the coating liquid, The hot air delivery unit 4 is provided with a hot air generation unit 6 that generates and delivers the hot air a, The hot air generating section 6 is configured to include an introduced air heating and generating section 7, which is made up of an introduced air heating heat exchange section 11 that heats introduced air b introduced from the outside by heat exchange with exhaust hot air d exhausted from the drying chamber section 3, and an air blowing section 8. The heated introduced air c obtained by heat exchange and heating the introduced air b in the introduced air heating heat exchange section 11 of the introduced air heating generation section 7 is directly or further heated to generate the hot air a, and the hot air a is blown by the blower section 8. forwarding The hot air is blown or drawn in and sent to the hot air delivery section 4 of the drying chamber 3 and then delivered into the drying chamber 3, The heat exchanger 11 for heating the introduced air of the hot air generating unit 7 of the hot air generating unit 6 has an exhaust path 9 through which the exhaust hot air d exhausted from the drying chamber 3 is exhausted to the outside, and an introduced air path 10 through which the introduced air b is introduced and sent to the drying chamber 3. The exhaust direction and the introduction direction are opposite but parallel to each other. The parallel path section 14 is provided with one or more air intake passages 14a and 14b, and the exhaust path 9 and the air intake passage 10 are provided with one or more air intake passages 14a and 14b, and the air intake passage 10 of the parallel path section 14 is The air intake passage 10 is arranged in parallel with the air intake passage 10. The exhaust hot air d is heated by heat exchange with the exhaust hot air d passing through the exhaust path 9, The heat exchange section 11 for heating the introduced air is connected to the introduced air passage 10 and the exhaust passage 9. the In the length direction In parallel Installed in a continuous or adjacent parallel configuration The parallel path portion 14 is configured to have the parallel path portion 14 The boundary between the exhaust passage 9 and the intake air passage 10 In the department, A heat conducting portion 16 for heat exchange is provided. And, This drying device is characterized in that the heat conduction section 16 is provided with heat exchange fin sections 17 that protrude into the exhaust path 9 and the inlet air path 10, respectively, to increase the heat exchange heating surface area.

[0015] The heat exchanger 11 for heating the introduced air is a boundary plate between the exhaust passage 9 and the introduced air passage 10 of the parallel passage section 14. is the heat conducting portion 16, and The plate-shaped heat conducting portion 16 Before The fin portion 17 is provided in the exhaust passage 9 and the intake air passage 10, and protrudes into the exhaust passage 9 and the intake air passage 10 to increase the heat exchange heating surface area. The boundary portion, which serves as a boundary plate between the exhaust passage 9 and the intake air passage 10, is made of a material with high thermal conductivity. butThe heat conducting portion 16 It is said that Both, The heat conducting portion 16 has the upright plate-shaped fin portion 17 in the exhaust path 9 and the intake air path 10. In multiple protruding positions The vertical surface of the fin portion 17 is , which are parallel to the exhaust direction and the introduction direction, which are the length directions of the exhaust path 9 and the introduction air path 10, and parallel to The present invention relates to the drying device according to claim 1, characterized in that the drying device is configured to be protruded.

[0016] Furthermore, the introduced air heating generation section 7, which is composed of the introduced air heating heat exchange section 11, is configured such that the introduced air b is heated by heat exchange heating with the exhaust hot air d by this introduced air heating heat exchange section 11, and the hot air a at a desired temperature is generated and sent out by the heated introduced air c, or by heated introduced air c obtained by further heating the heated introduced air c, or by mixed hot air e obtained by mixing the heated introduced air c and a part of the exhaust hot air d exhausted from the drying chamber section 3, or by mixed hot air e obtained by further heating the mixed hot air e, In the heat exchange section 11 for heating the introduced air, the introduced air b passes through the introduced air passage 10 of the parallel path section 14, and the exhaust hot air d passes through the exhaust passage 9 of the parallel path section 14 in the opposite direction, whereby the introduced air b is heated by heat exchange heating, and The heated inlet air c that has passed through the heat exchange section 11 for heating the inlet air and been heated, or that has been heated while passing through, is either left as is, or is branched, or is further mixed with a part of the exhaust hot air d, or is further heated to generate the hot air a of the desired temperature, which is then sent to the hot air delivery section 4 of the base material 2.

[0017] In addition, the drying chamber 3 is provided with a plurality of hot air blowing sections 4 from the upstream side to the downstream side of the substrate 2, The drying chamber section 3 is configured by connecting a plurality of drying chamber forming sections 5, and each drying chamber forming section 5 is provided with one or more of the hot air delivery sections 4, The drying device according to claim 1, characterized in that the exhaust path 9 and the air introduction path 10 are provided along the direction in which the drying chamber forming parts 5 are arranged in succession.

[0018] The introduction air heating generation section 7 of the hot air generation section 6 is further provided with a circulating mixing section 12 that generates mixed hot air e by mixing the heated introduction air c obtained by heat-exchanging and heating the introduction air b introduced from the outside using the introduction air heating heat exchange section 11 with a portion of the exhaust hot air d exhausted from the drying chamber forming section 5 of the drying chamber section 3, and the hot air a of the desired temperature is generated by the mixed hot air e generated in this circulating mixing section 12 or by the mixed hot air e that is further heated, and is then sent out to the hot air delivery section 4, as described in claim 1.

[0019] The hot air generating section 6 is also related to the drying device described in claim 5, characterized in that the introduced air heating generating section 7 of the hot air generating section 6 is configured to be equipped with a temperature adjusting heating section 13 that further heats the mixed hot air e obtained by mixing the heated introduced air c obtained by heat-exchanging and heating the introduced air b introduced from the outside using the introduced air heating heat exchange section 11 with a portion of the exhaust hot air d exhausted from the drying chamber forming section 5 of the drying chamber section 3, thereby generating and sending out the hot air a of the desired temperature. [Effects of the Invention]

[0020] Since the present invention is configured as described above, the hot air of the desired temperature sent to the hot air delivery section of the drying chamber is generated to the desired temperature by mixing with heated introduced air heated by heat exchange heating with the exhaust hot air, or by further mixing with a part of the exhaust hot air, or by final heating by the adjustment heating section, and sent to the hot air delivery section of the drying chamber. This configuration meets the demand for CO2 reduction and realizes an environmentally friendly drying device. In addition, the drawn-in introduced air is heat-exchange heated with the exhaust hot air, and this heat exchange heating section is, for example, connected to the exhaust path of the exhaust hot air and the introduction air path of the introduced air. Since the unit is configured to be a fixed length or to have multiple units in series, hot air of the desired temperature can be generated energy efficiently, which is environmentally friendly and highly practical.Furthermore, even if the drying device is used to dry coating films that may produce dangerous gases such as flammable gases during drying, the exhaust hot air contained therein is not circulated or is circulated at a low rate, but the external air (introduced air) can be heated with the exhaust hot air, and for example, the air can be further mixed with part of the exhaust hot air or further heated as a final step, thereby making it a hot air type drying device with a hot air generation unit that is also safe. [Brief explanation of the drawings]

[0021] [Figure 1] FIG. 1 is a schematic diagram illustrating the configuration of a first embodiment. [Figure 2] 3 is an enlarged schematic diagram illustrating the configuration of a hot air generating section that generates hot air to be sent to a hot air delivery section of a drying chamber forming section of a drying chamber according to a first embodiment. FIG. [Figure 3] FIG. 2 is a schematic diagram illustrating the configuration of a heat exchanger for heating introduced air provided in the introduced air passage and the exhaust passage of the hot air generating section of the first embodiment. [Figure 4] FIG. 10 is a schematic diagram illustrating the configuration of a second embodiment. [Figure 5] FIG. 10 is an enlarged schematic diagram illustrating the configuration of a hot air generating section that generates hot air to be sent to a hot air delivery section of a drying chamber forming section of a drying chamber according to a second embodiment. [Figure 6] FIG. 10 is a schematic diagram illustrating the configuration of a third embodiment. [Figure 7]FIG. 11 is an enlarged schematic diagram illustrating the configuration of a hot air generating section that generates hot air to be sent to a hot air delivery section of a drying chamber forming section of a drying chamber according to a third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0022] A preferred embodiment of the present invention will be briefly described below, illustrating the operation of the present invention with reference to the drawings.

[0023] For example, the film-like substrate 2 that has been coated by the coating device 1 is transported through the drying chamber forming sections 5 of the drying chamber section 3 in sequence, whereby the coating film formed on the surface is dried. That is, for example, when the substrate 2 with its upper surface already coated is taken up and transported through the drying chamber section 3, the coating film on the upper surface is dried by the heat of the hot air blown out from the hot air blowing section 4 provided in each drying chamber forming section 5 of the drying chamber section 3.

[0024] The hot air a sent from this hot air sending section 4 into each drying chamber forming section 5 of the drying chamber section 3 is heated and generated in the hot air generating section 6, and is sent into each drying chamber forming section 5 of the drying chamber section 3 via this hot air sending section 4 by the air sending section 8 (blower device or fan device).

[0025] The hot air generating section 6 of the present invention is configured to comprise an intake air heating and generating section 7 which comprises an intake air heating heat exchange section 11 which heats intake air b introduced from the outside by heat exchange with exhaust hot air d exhausted from the drying chamber section 3, and an air blowing section 8.

[0026] Therefore, in the present invention, the hot air a is generated as is or further heated by the heated introduction air c obtained by heat exchange heating of the introduction air b in the introduction air heating heat exchange section 11 of the introduction air heating generation section 7, and this hot air a is sent or drawn in by the air sending section 8 and sent to the hot air delivery section 4 of the drying chamber 3 and delivered into the drying chamber 3. For example, the hot air a at a desired temperature is generated and delivered by the heated introduction air c obtained by heating the introduction air b by heat exchange heating with the exhaust hot air d in the introduction air heating heat exchange section 11, or by heated introduction air c obtained by further heating the heated introduction air c, or by mixed hot air e obtained by mixing the heated introduction air c and a portion of the exhaust hot air d exhausted from the drying chamber 3, or by mixed hot air e obtained by further heating the mixed hot air e, and delivered into the drying chamber 3.

[0027] Furthermore, in the present invention, an exhaust path 9 through which the exhaust hot air d exhausted from the drying chamber 3 is exhausted to the outside and an introduction air path 10 through which the introduction air b is introduced and sent to the drying chamber 3 are connected to each other or on the way thereto. The exhaust direction and the introduction direction are opposite but parallel to each other. A parallel path section 14 is provided in a parallel state (connected state), and a heat exchange structure is provided in this parallel path section 14. 、 in particular This parallel path section 14 A heat conducting portion 16 and a fin portion 17 for heat exchange are provided at the boundary portion, and the introduced air b passing through the introduced air passage 10 on one side is passed through the exhaust passage 9 on the other side from the opposite direction. parallel The system is configured to have one or more heat exchange sections 11 for heating the introduced air, which heat the air by heat exchange with the exhaust hot air d passing through it, and these heat exchange sections 11 for heating the introduced air are constructed in an intervening state between the exhaust path 9 and the introduced air path 10 (using the introduced air path 10 and the exhaust path 9).

[0028] Therefore, for example, when the intake air b passes through the intake air passage 10 of the intake air heating heat exchange section 11 and the exhaust hot air d passes through the exhaust passage 9 in the opposite direction, the intake air b is heated by heat exchange heating, and the heated intake air c that has passed through the intake air heating heat exchange section 11, or the heated intake air c that has been heated while passing through the intake air heating heat exchange section 11, is left as is or branches off from the intake air passage 10 via the branch passage section 15, or is further mixed with a portion of the exhaust hot air d or is further heated to generate the hot air a of the desired temperature and is sent out to the hot air delivery section 4.

[0029] That is, the exhaust passage 9 and the intake air passage 10 parallel to each other The parallel path section 14 is provided with a heat exchange structure, and one or more heat exchange sections 11 for heating the introduced air are arranged interposed between the exhaust path 9 and the introduced air path 10.The introduced air b passes through the introduced air path 10 in this heat exchange section 11 for heating the introduced air, and the exhaust hot air d passes through the exhaust path 9 in the heat exchange section 11 in the opposite direction.As a result, the introduced air b is sequentially heated, for example, by continuous heat exchange heating or by multiple stepwise heat exchange heating.For example, the heated introduced air c that has been heat exchanged and heated while passing through the heat exchange section 11 for heating the introduced air, or the heated introduced air c that has been heat exchanged and heated after passing through the heat exchange section 11 for heating the introduced air, branches off from the introduced air path 10 via the branch path section 15, mixes with a portion of the exhaust hot air d, and is further heated to generate the hot air a of the desired temperature, which is then sequentially sent out to the hot air delivery section 4 of the base material 2.

[0030] Therefore, in the present invention, the inlet air passage 10 and the exhaust passage 9 are widely (longly) arranged along the drying chamber 3, and both of them are connected to the inlet air passage 10 and the exhaust passage 9. Parallel or adjacentBy providing a parallel path section 14 and providing a heat exchange structure in this parallel path section 14, the heat exchange section 11 for heating the introduced air is provided continuously or in multiple states in an intervening state in part or almost all of the introduced air path 10 and the exhaust path 9. Therefore, a heat exchanger that can heat exchange and heat the introduced air b by using the exhaust heat of the exhaust hot air d returning through the exhaust path 9 can be constructed efficiently and in a space-saving manner. Moreover, even if the heat exchange structure is simple and the heat exchange heating efficiency cannot be high, for example, it is a configuration in which heat is exchanged gradually over a long period of time or a sequential heating configuration in which heat exchange heating is performed in multiple stages, so the overall degree of heat exchange heating can be increased. Furthermore, by branching it sequentially and supplying it to the hot air delivery section 4, the heated introduced air c can be branched and supplied, so it is a drying device with excellent practicality that can generate and deliver hot air a with energy efficiency. [Example]

[0031] Specific embodiments of the present invention will be described with reference to the drawings.

[0032] In this embodiment, the present invention is applied to a drying device provided in a coating device 1 in which a film-like object to be coated (substrate 2) is pulled out from a take-up roll 18 and transported through an opposing support roll 20 that faces the nozzle section 19 of the coating device 1, a coating liquid is ejected from the tip discharge hole of the nozzle section 19, and the coating liquid is applied to one side (top surface) of the film-like substrate 2 supported by the opposing support roll 20, and the coated film-like substrate 2 is then transported horizontally through each drying chamber forming section 5 of the drying chamber section 3 of the drying device to dry it, and then wound up on a recovery roll 21.

[0033] That is, the drying device of this embodiment is provided downstream of the film coating device 1, which is configured to coat the upper surface of the substrate 2 with the coating liquid in the form of a film by conveying the film-like substrate 2 facing the nozzle portion 19 toward the nozzle portion 19 while ejecting the coating liquid from the tip discharge hole of the nozzle portion 19, and is configured to convey the film-like substrate 2, the upper surface of which has been coated by the coating device 1, through the film, and dry the coating film.

[0034] Specifically, the drying chamber section 3 is configured with multiple lidded main body sections (divided drying chamber forming sections 5) arranged side by side on the left and right, through which the film-like substrate 2 is transported and passed via left and right transport entrance and exit sections, and multiple support rolls 22 are provided at intervals within each drying chamber forming section 5 of the drying chamber section 3 to support the substrate 2, and hot air delivery sections 4 are provided above or above and below the substrate 2 being transported while supported by these support rolls 22, thereby drying it with hot air.

[0035] Specifically, a large number of support rolls 22 are arranged in parallel in the horizontal direction in each drying chamber forming section 5 of the drying chamber section 3, the film-like substrate 2 is passed over these support rolls 22, and while this film-like substrate 2 is taken up and transported horizontally, hot air a is blown out from multiple hot air blowing sections 4 provided in each drying chamber forming section 3, and the heat from this blown air dries the coated surface (coating film) on the upper surface of the substrate 2. Note that hot air blowing sections may be provided above and below all of the drying chamber forming sections 5 or some of the drying chamber forming sections 5 downstream of the transport, and the coated surface (coating film) may be dried by a floating drying method while the substrate is transported through without contact.

[0036] In this embodiment, hot air delivery sections 4 are provided at the top and bottom between each support roll 22 in the drying chamber 3, and similar to the drying device of the configuration shown in the prior patent document developed by the applicant, the hot air delivery section 4 located below the support roll 22 is provided with a Coanda action, that is, a Coanda nozzle section 23 that blows hot air a in a predetermined direction to generate a force that draws the substrate 2 downward, and presses the substrate 2 against the support roll 22 to abut it.

[0037] In this embodiment, the drying chamber 3 is configured to include a hot air generating section 6 that generates hot air a to be sent to each hot air sending section 4 of each drying chamber forming section 5 and sends this to the hot air sending section 4.

[0038] The hot air generating section 6 of this embodiment is configured to be composed of an introduced air heating and generating section 7 which generates and sends out mixed hot air e, which is obtained by mixing introduced air b introduced from the outside and heated by an introduced air heating heat exchange section 11, with a portion of exhaust hot air d exhausted from the drying chamber forming section 5 of the drying chamber section 3, and further heats the mixed hot air e by a temperature adjustment heating section 13 to generate and send out the hot air a of the desired temperature, thereby improving energy efficiency.

[0039] That is, the hot air generating section 6 of this embodiment is configured to comprise an introduction air heating generating section 7 which comprises an introduction air heating heat exchange section 11 which heats the introduction air b introduced from the outside by heat exchange with the exhaust hot air d exhausted from the drying chamber section 3, and an air blowing section 8, and the introduction air b is heated by heat exchange in the introduction air heating heat exchange section 11 of the introduction air heating generating section 7, and the heated introduction air c is further heated to generate the hot air a, and this hot air a is blown or drawn in by the air blowing section 8 and sent to the hot air delivery section 4 of the drying chamber section 3 and then sent into the drying chamber 3. In addition, in this first embodiment, the hot air generating section 6 is configured to heat the introduced air b by heat exchange heating using the introduced air heating heat exchange section 11, which heats the introduced air b, and to generate hot air a by mixing this heated introduced air c with exhaust hot air d and heating it with a heater using the temperature adjustment heating section 13, which further heats the mixed hot air e.The hot air a generated in this way and drawn in and blown by the blowing section 8 is configured to be delivered to the hot air delivery section 4 of each drying chamber forming section 5 of the drying chamber section 3.

[0040] In addition, the drying chamber section 3 of this embodiment is configured to be provided with a long exhaust path 9 through which the exhaust hot air d exhausted from each drying chamber forming section 5 of the drying chamber section 3 and sequentially joining together is exhausted to the outside, and a long intake air path 10 equipped with a branch path section 15 through which the intake air b is introduced and sequentially branched and sent to each drying chamber forming section 5 of the drying chamber section 3, in the direction in which the drying chamber forming sections 5 are connected (the length direction of the drying chamber section 3).

[0041] As described above, the introduced air heating generating section 7 of the hot air generating section 6 in this embodiment is configured to include the introduced air heating heat exchange section 11 that heats the introduced air b by heat exchange with the exhaust hot air d. The introduced air heating heat exchange section 11 in this embodiment is configured to connect the exhaust path 9 and the introduced air path 10, for example, vertically. Parallel The parallel path section 14 is provided over a wide area by arranging them in a stacked parallel state in a connected state, and the intake air b passing through the intake air path 10 of the parallel path section 14 having a configuration in which both are stacked and arranged parallel is heated by heat exchange (heat exchange via a heat exchange structure) with the exhaust hot air d passing through the exhaust path 9 of this parallel path section 14.

[0042] In the heat exchange section 11 for heating the intake air of this first embodiment, the exhaust path 9 and the intake air path 10 are arranged in a stacked, parallel configuration over a wide area vertically, and a heat exchange structure is applied to this long parallel path section 14, thereby constructing the long heat exchange section 11 for heating the intake air in an intervening state.

[0043] That is, the heat exchange section 11 for heating the intake air in the first embodiment is configured to be interposed between the intake air path 10 and the exhaust path 9 or continuously along them, providing a long heat exchange distance.

[0044] Specifically, this heat exchange section 11 for heating the introduced air is constructed along the drying chamber section 3 using the long introduced air path 10 and exhaust path 9, that is, by applying a heat exchange structure to the boundary portion of the stacked and parallel parallel path section 14, it is constructed over a wide area, and the introduced air b is heated by heat exchange heating caused by passing the introduced air path 10 of this heat exchange section 11 for heating the introduced air and passing the exhaust hot air d through the exhaust path 9 in the opposite direction.

[0045] Therefore, in this embodiment, by utilizing both of these ducts and providing the heat exchange section 11 for heating the introduced air midway through the ducts, space can be saved and construction is easy, resulting in a highly practical configuration.

[0046] That is, in this embodiment, even if the heat exchange section 11 for heating the introduced air is installed over a wide area, for example, over the total length of the continuous drying chamber forming section 5, it not only does not take up space but is also easy to construct. Moreover, even if the heat exchange heating capacity over a predetermined length is low, by using a long, continuous configuration in which heat exchange heating is performed gradually, the introduced air a can generally be heated to a high temperature, and it can be heated to a high temperature without using a steam-type heat exchanger that heats by heat exchange with high-temperature steam generated by a boiler, which is also environmentally friendly.

[0047] In this embodiment, the heated intake air c, which has been heated while passing through the heat exchange section 11 for heating the intake air, branches off from the main intake air path 10 via the branch path section 15, and after branching, is mixed with a portion of the exhaust hot air d and further heated to generate the hot air a of the desired temperature, which is sent to the hot air delivery section 4 downstream of the transport of the substrate 2.The heated intake air c, which does not branch off from the intake air path 10 but passes through the main flow path and is further heated by the heat exchange heating by the heat exchange section 11 for heating the intake air, branches off via the next branch path section 15, is mixed with a portion of the exhaust hot air d and further heated to generate the hot air a of the desired temperature, which is sent to the hot air delivery section 4 upstream of the transport of the substrate 2.

[0048] More specifically, the heat exchanger 11 for heating the introduced air in this embodiment is configured to connect the exhaust passage 9 and the introduced air passage 10. Parallel Long parallel path portions 14 arranged in a vertically stacked parallel state Consists of In this configuration, the heat exchange section 11 for heating the introduced air is provided in an intervening state in the exhaust path 9 and the introduced air path 10 (including cases where it is installed in almost all of them), and in this embodiment, a circulating mixing section 12 is provided which generates mixed hot air e by mixing the introduced air b introduced from the outside, which is heat-heated by heat exchange using the heat exchange section 11 for heating the introduced air, with a part of the exhaust hot air d exhausted from the drying chamber forming section 5 of the drying chamber section 3, and the mixed hot air e generated in this circulating mixing section 12 is further heated by a temperature adjustment heating section 13 to generate hot air a of the desired temperature and send it to the hot air delivery section 4.

[0049] That is, a heat exchange structure is applied to the parallel path section 14 in which the exhaust path 9 and the intake air path 10 are arranged in a stacked parallel state, and a long, continuous heat exchange section 11 for heating the intake air is provided between the exhaust path 9 and the intake air path 10, so that the intake air b passes through the intake air path 10 in this heat exchange section 11 for heating the intake air, and the exhaust hot air d passes through the exhaust path 9 in the heat exchange section 11 for heating the intake air from the opposite direction, thereby gradually heating the intake air b by continuous heat exchange heating.

[0050] As described above, the heated intake air c, which is heated by heat exchange while passing through the heat exchange section 11 for heating the intake air, branches off from the intake air path 10 via the branch path section 15, mixes with part of the exhaust hot air d, is further heated, and generates hot air a of the desired temperature, which is sent out to the hot air delivery section 4 of the drying chamber forming section 5 downstream of the transport of the substrate 2, and the heated intake air c, which passes further through the heat exchange section 11 for heating the intake air and is further heated by heat exchange while passing through, branches off from the intake air path 10 via the next branch path section 15, mixes with part of the exhaust hot air d, is further heated, and generates hot air a of the desired temperature, which is sent out to the hot air delivery section 4 of the next drying chamber forming section 5 upstream of the transport of the substrate 2.

[0051] Therefore, even if the heated introduction air c branched off upstream of the introduction is somewhat low in temperature, the temperature of the exhaust hot air d in the exhaust path 9 upstream of this introduction is somewhat high, and heated introduction air c with a sufficiently high temperature can be branched and supplied, and the shortfall can be made up by adjusting the degree of mixing with the exhaust hot air d and adjusting the heating by the temperature adjustment heating section 13. Furthermore, because the temperature of the heated introduction air c branched off and supplied downstream of the introduction is even higher, the temperature adjustment heating section 13 does not need to be as small, which saves space, and even with a simple heat exchange structure, by at least increasing the contact surface area and using a material with good thermal conductivity, hot air a can be generated energy efficiently by this overall long heat exchange.

[0052] In addition, the introduction air heating generation section 7 of the hot air generation section 6 in this embodiment is configured to include the introduction air heating heat exchange section 11, which is installed at intervals in the middle of the duct as described above, a circulating mixing section 12 which generates mixed hot air e by mixing the heated introduction air c heated thereby with a portion of the exhaust hot air d exhausted from the drying chamber forming section 5 of the drying chamber section 3, an air blowing section 8, a temperature adjustment heating section 13 which further heats the mixed hot air e drawn in by the air blowing section 8 to generate and send out the hot air a of the desired temperature, and a filter 24.

[0053] In this embodiment, as mentioned above, an electric heater heating section is used for the temperature adjustment heating section 13, and in addition to the air blowing section 8 provided at the ends of the inlet air path 10 and the exhaust path 9, heated inlet air c that passes through the inlet air heating heat exchange section 11 and is branched and introduced is drawn in by an air blowing section 8 such as an intake fan provided around the temperature adjustment heating section 13, and part of this heated inlet air c and exhaust hot air d are drawn into the circulating mixing section 12 (drawn in at a predetermined mixing ratio via a valve and merged and mixed), and this mixed hot air e is further heater-heated in the electric temperature adjustment heating section 13, and hot air a of the desired temperature is generated and sent out.

[0054] Therefore, in this embodiment, the heating source (heating source of the hot air generating section 6) for obtaining the desired temperature and predetermined amount of hot air a to be sent to the hot air delivery section 4 of the drying chamber section 3 does not use a steam heat exchanger that requires boiler heating, but is composed of heat exchange heating with the exhaust hot air d from the exhaust path 9, mixing with the exhaust hot air d controlled to a predetermined ratio, and heater heating by the electric temperature adjustment heating section 13.This makes it possible to realize an environmentally friendly drying device that can meet the demand for CO2 reduction, and also improves energy efficiency and saves power, making it an even more environmentally friendly drying device.

[0055] As described above, the heat exchange section 11 for heating the intake air in this embodiment is configured so that the intake air passages 10 and the exhaust passages 9 are arranged in a connected state (in this embodiment, in a stacked parallel state) in almost all of the intake air passages 10 and the exhaust passages 9 that are arranged along the drying chamber forming section 5 that are arranged in parallel over a wide area, thereby forming the parallel passage section 14, and a heat conduction section 16 for heat exchange as a heat exchange structure is provided at the boundary between the exhaust passage 9 and the intake air passage 10 of this parallel passage section 14 that is arranged in a wide area, and this heat conduction section 16 is provided with heat exchange fin sections 17 that protrude into the exhaust passage 9 and the intake air passage 10, respectively, and increase the heat exchange heating surface area.

[0056] Specifically, the intake air passage 10 and the exhaust passage 9 are formed by a square duct made of SUS, and this square duct is extended up and down over a wide range. Parallel The heat exchanger 10 is configured to be stacked. For example, in order to efficiently heat-exchange and heat the intake air b passing through the duct forming the upper intake air passage 10 with the hot exhaust air d passing through the duct forming the lower exhaust passage 9, the boundary portion serving as the boundary plate is made of a material with high thermal conductivity, i.e., an aluminum plate, and the heat-conducting portion 16 for heat exchange is provided at this boundary portion. Furthermore, in order to increase the contact area, a number of upright plate-shaped heat-exchange fin portions 17 are provided at intervals along the length of the duct to protrude from the heat-conducting portion 16 for heat exchange. That is, the boundary portion of the duct is made of aluminum heat-conducting portion 16, and a number of upright plate-shaped aluminum fin portions 17 are provided in the horizontal direction along the length of the duct in a protruding state above and below this, thereby forming an intake air heating heat exchanger 11 that continuously heats the intake air b over a wide range by heat exchange with the hot exhaust air d. In other words, the upright surface of the fin portion 17 is The exhaust direction and the introduction direction, which are the length directions of the exhaust path 9 and the introduction air path 10, are parallel to each other. It is configured to protrude in a certain direction.

[0057] Therefore, this embodiment is a heat exchange structure that increases the contact area without increasing air resistance, and since both paths have traditionally been sufficiently large and long, this has been utilized to interpose and construct the heat exchange section 11 for heating the introduced air.Since it can be formed over a wide area, even such a simple heat exchange structure is capable of heating to high temperatures overall, and the exhaust heat of the exhaust hot air d from the exhaust path 9 can be effectively utilized, making it possible to realize an extremely energy-efficient hot air generating section 6.

[0058] In this first embodiment, a duct forming section of a predetermined length serves as the parallel path forming section, and duct parts having the heat exchange structure are sequentially connected to each duct forming section to form a parallel path section 14 in which the intake air passage 10 and the exhaust passage 9 are arranged vertically in parallel, and an intake air heating heat exchange section 11 having the heat exchange structure therein is interposed between the intake air passage 10 and the exhaust passage 9. If this single duct forming section (duct part) having the heat exchange structure is considered to be the intake air heating heat exchange section 11, this embodiment can also be said to have a configuration in which multiple intake air heating heat exchange sections 11 are arranged in a connected state. In other words, this first embodiment can be said to have a configuration in which the intake air passage 10 and the exhaust passage 9 are arranged side by side, and a heat exchange structure is provided at the boundary between them to provide a single intake air heating heat exchange section 11 that heat exchanges and heats the intake air b continuously over a wide area, or a configuration in which multiple intake air heating heat exchange sections 11 are provided similar to the second embodiment described below.

[0059] On the other hand, the second embodiment is an embodiment in which a plurality of heat exchange sections 11 for heating the introduced air are arranged in series in the middle of the exhaust path 9 where the exhaust hot air d exhausted from each of the drying chamber forming sections 5 sequentially joins and is exhausted to the outside, and in the middle of the introduced air path 10 where the introduced air b is introduced and sequentially branched and sent out to each of the drying chamber forming sections 5.

[0060] In this second embodiment, multiple heat exchange sections 11 for heating the introduced air are arranged along the exhaust path 9 and the introduced air path 10, so that the introduced air b passes through these multiple heat exchange sections 11 for heating the introduced air in sequence, and the exhaust hot air d passes through them in the opposite direction, thereby heating the introduced air b in sequence by heat exchange heating.

[0061] Specifically, the heat exchange sections 11 for heating the introduced air are provided in plurality along the exhaust path 9 and the introduced air path 10, and are configured so that the introduced air b passes through these heat exchange sections 11 in sequence, and the exhaust hot air d passes through them in sequence from the opposite direction, thereby heating the introduced air b in sequence by multiple, step-by-step heat exchange heating.

[0062] That is, in this second embodiment, the drying chamber section 3, which is formed by forming a number of drying chamber forming sections 5 in series, is long, ensuring a long drying distance and increasing drying capacity, and as mentioned above, the duct that introduces the intake air b (the intake air path 10) and the duct that exhausts the exhaust hot air d (the exhaust path 9) are also long and arranged along the drying chamber section 3.

[0063] In this embodiment, by utilizing both of these ducts and arranging multiple heat exchange sections 11 for heating the intake air in series at intervals along the way of the ducts, it is possible to save space as in the first embodiment, and the construction is easy, resulting in a highly practical configuration.

[0064] In other words, in this embodiment, even if multiple heat exchange sections 11 for heating the introduced air are provided, for example, even if the same number as the number of drying chamber forming sections 5 are provided, not only does it not take up space but it is also easy to construct.Furthermore, even if the heat exchange heating capacity of one heat exchange section 11 for heating the introduced air is low, by arranging multiple sections in parallel and sequentially heating by heat exchange, the introduced air b can be heated to a high temperature, and it can be heated to a high temperature, even if in stages, without using a heat exchanger for heat exchange heating with high-temperature steam generated by boiler heating, which is also environmentally friendly.

[0065] To explain further, in this second embodiment, both ducts, i.e., the exhaust path 9 and the inlet air path 10, are used and multiple heat exchange sections 11 for heating the inlet air are provided along the way, specifically, for example, a number equal to the number of drying chamber forming sections 5.The heated inlet air c that has passed through the heat exchange section 11 for heating the inlet air on the upstream side of the inlet passes through the next heat exchange section 11 for heating the inlet air on the downstream side of the inlet, and is further heated by heat exchange heating with the exhaust hot air d passing from the opposite direction, branches off from the inlet air path 10, and is further mixed with a portion of the exhaust hot air d and further heated to generate the hot air a of the desired temperature, which is then sent out to the hot air delivery section 4 of the drying chamber forming section 5 on the upstream side of the transport of the substrate 2.

[0066] The heated intake air c passes through the next intake air heating heat exchange section 11 without branching from the intake air path 10 and is heated by the heat exchange heating, and is then either left as is or branches via the branch path section 15, and after branching, is mixed with a part of the exhaust hot air d and further heated to generate the hot air a of the desired temperature, which is then sent to the hot air delivery section 4 upstream of the transport of the substrate 2.

[0067] In addition, the third embodiment is an embodiment configured such that the heat exchange section 11 for heating the introduced air is provided in the middle of the exhaust path 9, where the exhaust hot air d exhausted from each of the drying chamber forming sections 5 sequentially joins and is exhausted to the outside, and in the middle of the introduced air path 10, where the introduced air b is introduced and sequentially branched and sent to each of the drying chamber forming sections 5.However, this is an embodiment configured such that the heated introduced air c is not branched and supplied to each drying chamber forming section 5 of each drying chamber section 3 after passing through this heat exchange section 11 for heating the introduced air, but is branched and supplied to each drying chamber forming section 5 of each drying chamber section 3 after passing through.

[0068] Specifically, in this third embodiment, the heat exchange section 11 for heating the introduced air is arranged in an intervening state along the exhaust path 9 and the introduced air path 10, but is arranged only in the pre-introduction stage of the introduced air path 10, and the introduced air b is heated by heat exchange heating as the introduced air b passes through this heat exchange section 11 for heating the introduced air and the exhaust hot air d passes through from the opposite direction, and then the introduced air b is sequentially branched from the main introduced air path 10 via branch paths 15 to each drying chamber forming section 5, and is heated and adjusted to generate hot air a of the desired temperature in the same way as in the first and second embodiments, and is then sent to the hot air delivery section 4 of each drying chamber forming section 5.

[0069] Specifically, the drying chamber section 3, which is formed by connecting a large number of drying chamber forming sections 5, is long, ensuring a long drying distance and increasing drying capacity, and as mentioned above, the duct that introduces the intake air b (the intake air path 10) and the duct that exhausts the exhaust hot air d (the exhaust path 9) are both long and arranged along the drying chamber section 3.

[0070] The heat exchange section 11 for heating the introduced air, which is provided upstream of the exhaust path 9 and the introduced air path 10, is configured so that the introduced air b passes through this heat exchange section 11 for heating the introduced air and the exhaust hot air d passes through it sequentially from the opposite direction, thereby heating the introduced air b, and this heated introduced air c is sequentially sent to each drying chamber forming section 5 through the branch path 15.In this third embodiment, as in the other embodiments, both of these ducts are used and the heat exchange section 11 for heating the introduced air is provided in these ducts, so that although the intervening construction area is not long compared to the first embodiment, space saving can be similarly achieved and construction is easy, resulting in a highly practical configuration.

[0071] That is, in this embodiment, not only does it not take up space but it is also easy to construct, and even if the heat exchange heating capacity of a part of the heat exchange structure is low, by arranging it continuously over a wide area (long length), the heat exchange heating capacity can be easily increased. Since there is sufficient space for conventional ducts, by arranging both rectangular ducts in a connected and parallel state in almost all of it as in the first embodiment or in part of it as in this third embodiment, and further providing the heat exchange section 11 for heating the introduced air of a predetermined length with a heat exchange structure that has good thermal conductivity and a large contact surface area, the introduced air b can be heated to a high temperature, and it can be heated to a high temperature without using a steam type heat exchanger that heats by heat exchange with high temperature steam generated by boiler heating, and it is also environmentally friendly.

[0072] To explain further, in this third embodiment, both ducts, i.e., the exhaust path 9 and the intake air path 10, are used, and in this embodiment, the heat exchange section 11 for heating the intake air is provided in the early stage part along the way, specifically, for example, it is provided for a predetermined length upstream of the intake air path 10, and the heated intake air c that passes through this heat exchange section 11 for heating the intake air is heat exchanged and heated by the exhaust hot air d passing from the opposite direction, and then branches off sequentially from the main intake air path 10, mixes with part of the exhaust hot air d and is further heated to generate the hot air a of the desired temperature, which is then sent out to the hot air delivery section 4 of the drying chamber formation section 5 upstream of the transport of the substrate 2.

[0073] That is, the heated inlet air c, which branches off from the next branch 15 of the main inlet air path 10, is mixed with a part of the exhaust hot air d after branching, and is further adjusted and heated to generate the hot air a of the desired temperature, which is then sent to the hot air delivery section 4 upstream of the transport of the substrate 2.

[0074] The present invention is not limited to this embodiment, and the specific configuration of each component can be designed as appropriate. [Explanation of symbols]

[0075] 1 Coating device 2 Base material 3 Drying room 4 Hot air outlet section 5 Drying chamber forming part 6 Hot air generation section 7. Intake air heating generation section 8. Blower 9 Exhaust duct 10. Inlet air passage 11 Heat exchange section for heating the introduced air 12 Circulation mixing section 13 Heating part for temperature adjustment 14 Parallel road section 15 Branch road section 16 Heat conduction section 17 Heat exchange fin section 18 Winding roll 19 Nozzle section 20 Opposing support roll 21 Recovery Roll 22 Support roll 23 Coanda nozzle part 24 filters a hot air b Intake air c Heated intake air d Exhaust hot air e Mixed hot air

Claims

1. A drying device comprising: a drying chamber section through which a film-like substrate coated with a coating liquid by a coating device and discharged from the coating device is transported; and a hot air delivery section that delivers hot air for drying the coated surface of the substrate coated with the coating liquid, The hot air delivery unit is provided with a hot air generation unit that generates and delivers the hot air, The hot air generating unit is configured to include an introduced air heating and generating unit that is an introduced air heating heat exchanger that heats the introduced air introduced from the outside by heat exchange with the exhaust hot air exhausted from the drying chamber, and a blower unit, The introduced air is heat-exchanged and heated in the introduced air heating heat exchange section of the introduced air heating generation section, and the heated introduced air is directly or further heated to generate the hot air, and the hot air is blown or drawn in by the blowing section and sent to the hot air delivery section of the drying chamber and then sent into the drying chamber, The heat exchanger for heating the introduced air of the introduced air heating generation unit of the hot air generation unit is provided in a parallel path section in which an exhaust path through which the exhaust hot air exhausted from the drying chamber section is exhausted to the outside and an introduced air path through which the introduced air is introduced and sent to the drying chamber section are arranged in a parallel state with the exhaust direction and the introduction direction being opposite to each other but parallel to each other, and one or more of the heat exchanger for heating the introduced air is provided in the exhaust path and the introduced air path, and the introduced air passing through the introduced air path of the parallel path section is heated by heat exchange with the exhaust hot air passing through the exhaust path arranged in parallel to the introduced air path, The heat exchange section for heating the intake air is configured to consist of a parallel path section in which the intake air path and the exhaust path are arranged parallel to each other in a continuous or adjacent parallel state in the longitudinal direction, and a heat conduction section for heat exchange is provided at the boundary between the exhaust path and the intake air path in this parallel path section, and this heat conduction section is provided with heat exchange fin sections that protrude into the exhaust path and the intake air path, respectively, and increase the heat exchange heating surface area.

2. The heat exchange section for heating the introduced air is configured such that the boundary section, which is a boundary plate between the exhaust path and the introduced air path of the parallel path section, serves as the heat conduction section, and the plate-shaped heat conduction section is provided with the upright plate-shaped fin sections that protrude into the exhaust path and the introduced air path, respectively, and increase the heat exchange heating surface area, The boundary portion, which serves as a boundary plate between the exhaust passage and the intake air passage, is made of a material with high thermal conductivity, thereby making the boundary portion the thermally conductive portion; 2. The drying device according to claim 1, wherein the heat conduction section has a plurality of upright fin sections protruding within the exhaust passage and the intake air passage, and the upright surfaces of the fin sections are parallel to the exhaust direction and the intake direction, which are the length directions of the exhaust passage and the intake air passage, and are each protruding parallel to each other.

3. The introduced air heating generating section, which is made up of the introduced air heating heat exchange section, is configured so that the introduced air is heated by heat exchange heating with the exhaust hot air by this introduced air heating heat exchange section, or the heated introduced air is further heated, and the hot air of a desired temperature is generated and sent out, or the hot air of a desired temperature is generated and sent out by mixed hot air obtained by mixing the heated introduced air and a part of the exhaust hot air exhausted from the drying chamber, or by mixed hot air obtained by further heating this mixed hot air, In the heat exchange unit for heating the introduced air, the introduced air passes through the introduced air passage of the parallel path section, and the hot exhaust air passes through the exhaust passage of the parallel path section in the opposite direction, whereby the introduced air is heated by heat exchange heating; 2. The drying device according to claim 1, wherein the heated inlet air that has passed through the heat exchange section for heating the inlet air or that has been heated while passing through is either left as is, or is branched, or is further mixed with a portion of the exhaust hot air, or is further heated to generate hot air of a desired temperature, and is then sent to the hot air delivery section for the substrate.

4. The drying chamber is provided with a plurality of hot air blowing sections from the upstream side to the downstream side of the substrate, The drying chamber section is configured by connecting a plurality of drying chamber forming sections, and each drying chamber forming section is provided with one or more of the hot air delivery sections, 2. The drying device according to claim 1, wherein the exhaust passage and the air introduction passage are arranged along a direction in which the drying chamber forming sections are arranged in succession.

5. The drying device according to claim 1, characterized in that the introduction air heating generation section of the hot air generation section is provided with a circulating mixing section that generates mixed hot air by mixing the heated introduction air obtained by heat exchange and heating the introduction air introduced from the outside using the introduction air heating heat exchange section with a portion of the exhaust hot air exhausted from the drying chamber forming section of the drying chamber section, and the hot air of a desired temperature is generated by the mixed hot air generated by this circulating mixing section or by the mixed hot air further heated by this mixed hot air, and is sent out to the hot air delivery section.

6. The drying device according to claim 5, characterized in that the intake air heating and generating section of the hot air generating section is configured to be equipped with a temperature adjusting heating section that further heats the mixed hot air obtained by mixing the heated intake air obtained by heat-exchanging and heating intake air introduced from the outside using the intake air heating heat exchange section with a portion of the exhaust hot air exhausted from the drying chamber forming section of the drying chamber section, thereby generating and sending out the hot air of a desired temperature.

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