JP2018132272A - Drying apparatus and method for producing dried body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce variation of temperatures while drying an object to be dried containing a plurality of substances.SOLUTION: A drying apparatus includes: a furnace; a conveyor belt for conveys an object 34 to be dried, to a transportation direction thereof (longitudinal direction thereof) in an interior space of the furnace; one or more infrared heater 40 capable of emitting infrared radiation to the object 34 being conveyed in the interior space of the furnace; and a shielding member 52. The shielding member 52 shields the infrared radiation emitted from the infrared heater 40, so that a plurality of intervals 55 where the object 34 is exposed to the infrared radiation emitted from the infrared heater 40 and a plurality of intervals 56 where the object 34 is not exposed thereto exist alternately along the transportation direction in the interior space of the furnace.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a drying apparatus and a method for producing a dried body.

  Conventionally, a drying apparatus for drying an object to be dried using infrared rays is known (see, for example, Patent Document 1). The drying apparatus described in Patent Document 1 dries the coating film using an infrared panel heater disposed in a furnace.

Japanese Patent No. 3897456

  By the way, when a to-be-dried substance contains multiple types of substance, the easiness of the heating by infrared rays may differ between multiple types of substances by the difference in the infrared absorption factor between multiple types of substances. In this case, for example, there are cases where the temperature in the material to be dried varies due to the irradiation of infrared rays, for example, the portion where many substances that are easily heated in the material to be dried are unevenly distributed tends to become high temperature. When the temperature varies, the drying speed varies, and thus there may be a problem such as non-uniform thickness of the material to be dried after drying.

  The present invention has been made in order to solve such a problem, and a main object thereof is to reduce temperature variations during drying of an object to be dried containing a plurality of types of substances.

  The present invention employs the following means in order to achieve the main object described above.

The drying device of the present invention comprises:
A drying device for drying an object to be dried,
A furnace body;
Transport means for transporting the material to be dried in the transport direction in the internal space of the furnace body;
One or more infrared heaters capable of radiating infrared rays to an object to be dried conveyed through the internal space of the furnace body;
In the internal space of the furnace body, an irradiation section in which infrared rays emitted from the infrared heater are irradiated on the object to be dried and a non-irradiation section in which the object to be dried is not irradiated are alternately arranged along the transport direction. A shielding member for shielding infrared rays from the infrared heater,
It is equipped with.

  In this drying apparatus, the infrared rays from the infrared heater are shielded by the shielding member, so that the irradiation section and the non-irradiation section alternately exist in the inner space of the furnace body along the conveyance direction of the object to be dried, and There are a plurality of irradiation sections and non-irradiation sections. Therefore, when an object to be dried is transported through the internal space of the furnace body, the object to be dried is dried while passing through the irradiation section and the non-irradiation section alternately a plurality of times. Here, when the object to be dried includes a plurality of types of substances, while the object to be dried passes through the irradiation section, as described above, the temperature in the object to be dried varies due to the irradiation of infrared rays, and thus a local temperature difference. May spread. On the other hand, while the material to be dried passes through the non-irradiated section, the temperature variation in the material to be dried decreases due to heat conduction. Therefore, the drying apparatus of the present invention can reduce variation in temperature when drying an object to be dried, for example, as compared with a case where there is no non-irradiation section because the irradiation section and non-irradiation section exist alternately. .

  Here, the “irradiation section” is a section where the infrared rays from the heating element of the infrared heater can reach the object to be dried without reflection, that is, the shielding member is on a straight line between the heating element and the object to be dried. The section does not exist. In addition, the “non-irradiation section” is a section where the infrared rays from the heating element of the infrared heater are not reflected and cannot reach the object to be dried linearly, that is, the shielding member is on a straight line between the heating element and the object to be dried. An existing section is assumed.

The drying device of the present invention comprises:
A partition disposed between an object to be dried transported in the internal space of the furnace body and the one or more infrared heaters, and the shielding member constitutes a part of the partition, and the partition May have a transmitting member that is disposed so as to block the portion where the shielding member does not exist and transmits infrared rays from the infrared heater and allows infrared irradiation to the irradiation section. In this case, the partition may partition the internal space of the furnace body. Further, the transmission member may partition the internal space of the furnace body. If it carries out like this, a shielding member can be used also as a part of partition which partitions off the internal space of a furnace body. The shielding member may reflect infrared rays. If it carries out like this, overheating of a partition can be suppressed compared with the case where a shielding member absorbs infrared rays, for example.

  In the drying apparatus of the present invention, a plurality of the infrared heaters are arranged along the transport direction, and the shielding member is disposed so as to cover only a part of the periphery of each of the plurality of infrared heaters. It may be. In this case, the infrared heater includes a heating element that emits infrared rays when heated, and a transmission tube that surrounds the periphery of the heating element and transmits infrared rays from the heating element. May be disposed on the surface of the permeation tube.

  In the drying apparatus of the present invention in which a shielding member is provided for each of the infrared heaters, the shielding member may reflect infrared rays. If it carries out like this, since the infrared rays after reflection by a shielding member will become easy to be utilized for at least one of the heating of a heat generating body, and the heating of a to-be-dried object, energy efficiency improves.

The method for producing a dry body of the present invention comprises:
Drying the object to be dried by transporting the object to be dried so as to pass through an irradiation section where infrared rays are irradiated to the object to be dried and a non-irradiation section where the object to be dried is not irradiated alternately alternately several times. Drying process,
Is included.

  In this dry body manufacturing method, the drying object is dried while being conveyed so as to pass through the irradiation section and the non-irradiation section alternately multiple times, so that the irradiation section is similar to the above-described drying apparatus of the present invention. The magnitude of the temperature variation in the to-be-dried material generated in step 1 can be reduced in the non-irradiated section. Therefore, variation in temperature during the drying process of an object to be dried containing a plurality of types of substances can be reduced. This also makes it possible to suppress problems caused by temperature variations such as non-uniform thickness of the dried body. In addition, you may make a to-be-dried body by performing this drying process, and you may make a to-be-dried body by performing another process (for example, drying by a hot air) after this drying process. . The method for producing a dry body of the present invention can be performed using, for example, the above-described drying apparatus of the present invention.

1 is a schematic sectional view of a drying device 1. FIG. AA sectional drawing of FIG. The fragmentary sectional view of the BB cross section of FIG. Explanatory drawing of the irradiation area 55 and the non-irradiation area 56. FIG. Explanatory drawing of the infrared heater 140 provided with the shielding member 152 of the modification. Explanatory drawing of the infrared heater 240 provided with the shielding member 252 of a modification. Explanatory drawing of the shielding member 352 of a modification.

  Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic cross-sectional view of a drying apparatus 1 according to an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line AA of FIG. FIG. 3 is a partial cross-sectional view taken along the line BB in FIG. FIG. 4 is an enlarged view of a part of FIG. In FIG. 2, the nozzle 60 and the guide roll 30 are not shown. In the present embodiment, the vertical direction, the horizontal direction, and the front-back direction are as shown in FIGS. The drying device 1 is a device that dries the material to be dried 34 while transporting the material to be dried 34 (see FIG. 2) placed on the belt 22 of the belt conveyor 20 in the transport direction. In this embodiment, the transport direction is a direction from the front to the rear. The drying apparatus 1 includes an infrared drying furnace 1a, a hot air drying furnace 1b, a belt conveyor 20, and a control device 90. The drying device 1 may not include the hot air drying furnace 1b.

  The material to be dried 34 includes a plurality of types of substances. For example, the material to be dried 34 may include raw material particles (for example, at least one of ceramic particles and metal particles), a binder, and a solvent. In the present embodiment, the material to be dried 34 is a molded body of a slurry containing these substances, and is a film-like body extending in the front-rear and left-right directions. By subjecting the material to be dried 34 to a drying process using the drying device 1, the solvent in the material to be dried 34 is volatilized and removed, and the material to be dried 34 is dried. The dried material 34 to be dried, that is, the dried body is then fired, for example, the binder is volatilized and removed, and the final product (baked body) is obtained. Examples of the product obtained using such an object to be dried 34 include an electronic component or a sensor element. The to-be-dried object 34 is good also as the film thickness after drying being 0.05 mm or more and 3 mm or less.

  The infrared drying furnace 1 a is a device that dries the object to be dried 34 using infrared rays, and includes a furnace body 10, an infrared heater 40, a partition wall 50, a nozzle 60, and a nozzle 70. The furnace body 10 is a structure formed in a substantially rectangular parallelepiped shape, and as shown in FIG. 1, a carry-in port 11 and a carry-out port 12 are provided at both ends in the front-rear direction. As shown in FIGS. 1 and 2, the internal space of the furnace body 10 is partitioned by a partition wall 50 and a belt 22 of the belt conveyor 20. Of the internal space of the furnace body 10, the space above the partition wall 50 is referred to as a space S2. The space below the partition wall 50 in the internal space of the furnace body 10 is further partitioned vertically by the belt 22, and the space between the partition wall 50 and the belt 22 is referred to as a space S <b> 1. The lower space is referred to as space S3. The carry-in port 11 and the carry-out port 12 both communicate with the space S1. The object to be dried 34 placed on the belt 22 is carried into the space S1 from the carry-in port 11, travels in the space S1 in the carrying direction, and is carried out from the carry-out port 12.

  The infrared heater 40 is a device that irradiates the object to be dried 34 that passes through the space S1 with infrared rays, and one or more infrared heaters 40 are attached in the space S2. In the present embodiment, a plurality of (9 in this embodiment) infrared heaters 40 are arranged substantially evenly in the space S <b> 2 along the conveyance direction of the object to be dried 34. The plurality of infrared heaters 40 have the same configuration, and are attached so that the longitudinal direction is orthogonal to the transport direction. Hereinafter, the configuration of one infrared heater 40 will be described.

  As shown in the enlarged views of FIGS. 2 and 4, the infrared heater 40 includes a heater body 43 formed so that a filament 41 as a heating element is surrounded by an inner tube 42 (transmission tube), and an outer side of the heater body 43. And an outer tube 44 (permeation tube) formed so as to surround the inner tube 42. The infrared heater 40 is a space between the inner tube 42 and the outer tube 44, a refrigerant flow path 46 through which refrigerant can flow, and a pair of bottomed cylindrical shapes fitted airtightly at both left and right ends of the outer tube 44. A cap 48.

  The filament 41 is a heating element that emits infrared rays when heated, and is made of W (tungsten) in this embodiment. In addition, examples of the material of the filament 41 include Ni—Cr alloy, Mo, Ta, and Fe—Cr—Al alloy. Electric power is supplied to both ends of the filament 41 from a power supply source (not shown). The inner tube 42 and the outer tube 44 are cylindrical tubes and are made of an infrared transmitting material that transmits at least part of the infrared rays from the filament 41. In this embodiment, the inner tube 42 and the outer tube 44 are both made of quartz glass. The inside of the inner tube 42 is an atmosphere in which halogen gas is added to argon gas. In the refrigerant flow path 46, for example, a fluid such as air can flow as a refrigerant. The refrigerant flowing through the refrigerant flow path 46 serves to lower the temperature of the outer tube 44 that is the outer surface of the infrared heater 40 or to adjust the temperature to an arbitrary temperature. The cap 48 is fixed in the furnace body 10 by a mounting member (not shown), and holds the heater body 43 and the outer tube 44. The cap 48 is provided with an unillustrated wiring lead-out portion and a refrigerant inlet / outlet, through which power is supplied from the outside of the furnace body 10 to the filament 41 and between the outside of the furnace body 10 and the refrigerant flow path 46. The refrigerant can flow in and out. The infrared heater 40 can generate infrared rays having various wavelengths. For example, the infrared heater 40 generates infrared rays (near infrared rays) having a peak wavelength of about 6 μm or less.

  The partition wall 50 is disposed between the upper and lower parts of the object to be dried 34 and the plurality of infrared heaters 40 that are transported in the interior space of the furnace body 10 in the vertical direction, and partitions the space S1 and the space S2 of the furnace body. . The partition wall 50 includes a transmissive member 51 made of a material that transmits infrared rays (particularly near infrared rays) and a shielding member 52 made of a material that blocks (does not transmit) infrared rays (particularly near infrared rays). ing.

  As shown in FIGS. 1 to 3, the shielding member 52 extends horizontally in the front-rear direction and has a shape in which a central portion in the left-right direction protrudes in a rectangular shape upward. A plurality of openings are arranged along the front-rear direction on the top surface of the shielding member 52 that protrudes in a rectangular shape (the upper end surface of the shielding member 52). Each of the plurality of transmission members 51 is disposed on the upper end surface of the shielding member 52 so as to close each of the plurality of openings. In the present embodiment, the opening of the shielding member 52 and the shape of the transmission member 51 are rectangular when viewed from above. The transmitting member 51 is a plate-like member. As shown in FIG. 4, each of the plurality of openings of the shielding member 52 is positioned directly below the infrared heater 40 and corresponds to the infrared heater 40 on a one-to-one basis.

  Due to the presence of the shielding member 52, the region irradiated with the infrared ray from the infrared heater 40 is limited. More specifically, of the infrared rays radiated from the filament 41 of the infrared heater 40, the infrared rays that have passed through the openings of the transmission member 51 and the shielding member 52 reach the material to be dried 34. That is, as shown in FIG. 4, the irradiation angle α of the infrared rays irradiated to the material to be dried 34 from each of the infrared heaters 40 is limited to a predetermined value by the shielding member 52. As a result, as shown in FIG. 4, in the space S <b> 1, an irradiation section 55 where the infrared ray emitted from the infrared heater 40 is irradiated to the object to be dried 34, and a non-irradiation section 56 where the object to be dried 34 is not irradiated. Is present. There are a plurality of irradiation sections 55 and non-irradiation sections 56, and they are alternately arranged along the conveyance direction of the material to be dried 34.

  In the irradiation section 55, the shielding member 52 does not exist on the section where the infrared rays from the filament 41 can reach the object to be dried 34 without being reflected, that is, on the straight line between the filament 41 and the object to be dried 34. Interval. The non-irradiation section 56 is a section where the infrared rays from the filament 41 are not reflected and cannot reach the dried object 34 linearly, that is, a section where a shielding member is present on a straight line between the filament 41 and the dried object 34. To do. The two broken lines that define the range of the irradiation angle α shown in the enlarged view of FIG. 4 are tangents between the shielding member 52 and the filament 41. As shown in FIG. 4, the area between the two broken lines in the infrared irradiation surface (here, the upper surface) of the object to be dried 34 is an irradiation section 55, and the area between adjacent irradiation sections 55 is A non-irradiation section 56 is obtained.

  The irradiation section 55 is an area determined by the positional relationship between the area where the shielding member 52 does not exist (here, the opening of the shielding member 52) and the infrared heater 40 corresponding to the area. For example, in the present embodiment, since the plurality of openings of the shielding member 52 and the infrared heater 40 correspond one-to-one, the cover is passed from one infrared heater 40 through the opening located directly below itself. Only a section in which the dried product 34 is irradiated with infrared rays is defined as an irradiation section 55. On the other hand, infrared rays from a certain infrared heater 40 can reach the material to be dried 34 through an opening located at a position other than directly below the infrared heater 40. The section to be performed is not included in the irradiation section 55. The infrared rays from the infrared heater 40 reach the object to be dried 34 through a region other than the region corresponding to the infrared heater 40 in the “region where the shielding member 52 does not exist” (linearly reaches without being reflected). It is preferable to adjust at least one of the positional relationship between the infrared heater 40 and the shielding member 52, the shape of the infrared heater 40, and the shape of the shielding member 52 so as not to be possible.

  In the present embodiment, as shown in FIG. 2, the lower surface on both sides in the left-right direction of the shielding member 52 and both end portions of the upper surface of the belt 22 are in contact with each other. Thus, as described above, the space below the partition wall 50 is partitioned into the space S1 and the space S3.

  An example of the material of the transmission member 51 is quartz glass. Quartz glass has a characteristic of transmitting infrared rays (near infrared rays) having a wavelength of 3.5 μm or less with high transmittance. Examples of the material of the shielding member 52 include stainless steel and aluminum. Stainless steel is suitable for the shielding member 52 because it has a characteristic of not transmitting infrared rays having a wavelength of about 6 μm or less. Moreover, it is preferable that the shielding member 52 reflects infrared rays. Aluminum not only has the property of not transmitting infrared rays having a wavelength of about 6 μm or less, but also has a higher infrared reflectance than stainless steel, and thus is more suitable for the shielding member 52. When the shielding member 52 reflects infrared rays, overheating of the partition wall 50 can be suppressed.

  As shown in FIG. 1, a plurality of nozzles 60 are arranged above each infrared heater 40 in the space S <b> 2 of the furnace body 10 with a predetermined interval in the front-rear direction. From each nozzle 60, the temperature-adjusted air is discharged downward (see thin arrows). The temperature of the partition 50 is adjusted by the air thus discharged striking the partition 50. The air thus discharged is discharged to the outside through an exhaust port 13 provided on the upper surface of the furnace body 10 (see thin arrows).

  Similarly, an air supply port 14 and an exhaust port 15 are formed in the space S3 of the furnace body 10. The air whose temperature is adjusted is discharged from the air supply port 14 toward the rear (see thin arrows). The temperature of the belt 22 is adjusted by the air thus discharged hitting the belt 22. The air discharged from the air supply port 14 is discharged to the outside through the exhaust port 15 (see thin arrows).

The nozzle 70 is a nozzle for discharging nitrogen gas (N ₂ gas), and is disposed in the vicinity of the carry-in port 11 outside the furnace body 10 as shown in FIG. From the nozzle 70, nitrogen gas whose temperature and humidity are adjusted is discharged in the transport direction toward the inside of the space S <b> 1 (see the thick white arrow). As described above, when the nitrogen gas flows in the transport direction in the space S1, the temperature and the solvent concentration of the gas containing the solvent evaporated from the object to be dried 34 are made as uniform as possible in the region near the surface of the object to be dried 34. It has become. The nitrogen gas that has passed through the space S1 is discharged to the internal space S4 of the furnace body 80 described later via the carry-out port 12 (see a thick white arrow). The gas discharged from the nozzle 70 is not limited to nitrogen gas, but may be any inert gas, for example, argon.

  The hot air drying furnace 1b is an apparatus that dries the material to be dried 34 using hot air, and includes a furnace body 80 and a nozzle 85 as shown in FIG. The furnace body 80 is connected to the rear end of the furnace body 10. The interior of the furnace body 80 is configured by one space S4. The carry-out port 12 of the furnace body 10 described above also serves as a carry-in port for the furnace body 80. A carry-out port 81 is provided at the rear end of the furnace body 80. The material to be dried 34 placed on the belt 22 and passed through the carry-out port 12 of the furnace body 10 proceeds in the transport direction in the space S4 and is carried out from the carry-out port 81.

  An air supply port 83 and an exhaust port 84 are formed below the belt 22 in the space S <b> 4 of the furnace body 80, similarly to the air supply port 14 and the exhaust port 15 of the furnace body 10. From the air supply port 83, the air whose temperature has been adjusted is discharged rearward (see thin arrows). Thus, the air discharged from the air supply port 83 heats the material to be dried 34 in the space S4 from below or adjusts the temperature. Thereby, it is easy to keep the temperature of the material to be dried 34 constant.

  As shown in FIG. 1, a plurality of nozzles 85 are arranged above the furnace body 80 in the space S4 with a predetermined interval in the front-rear direction. From each nozzle 85, air (hot air) adjusted to a high temperature is discharged downward (see thin arrows). The air (hot air) thus discharged hits the object to be dried 34, so that the object to be dried 34 is further dried. The air (hot air) discharged in this way is discharged to the outside through an exhaust port 82 provided on the upper surface of the furnace body 80 (see thin arrows). From this exhaust port 82, the nitrogen gas flowing into the space S4 from the space S1 and the solvent evaporated from the material to be dried 34 are also discharged to the outside.

  The belt conveyor 20 (conveying means) is a mechanism for conveying the material to be dried 34 in the conveying direction (here, the front-rear direction), and includes a belt 22 and a plurality of guide rolls 30. The belt 22 is moved in the transport direction by a known belt drive mechanism (not shown), and in this order in the space S1 of the furnace body 10 of the infrared drying furnace 1a and in the space S4 of the furnace body 80 of the hot air drying furnace 1b. pass. As the belt 22 moves, the material to be dried 34 on the belt 22 is transported in the transport direction. A plurality of guide rolls 30 are arranged along the transport direction in the space S3 of the furnace body 10 and in the space S4 of the furnace body 80, and guide the moving belt 22. In the present embodiment, the PET film 32 is placed on the upper surface of the belt 22, and the material to be dried 34 is placed on the upper surface of the PET film 32. The PET film 32 is used for the purpose of facilitating the handling of the material to be dried 34 (see FIGS. 2 and 4).

  The control device 90 is configured as a microprocessor centered on a CPU, for example. The control device 90 controls the belt driving mechanism of the belt conveyor 20 to control the moving speed of the belt 22. The control device 90 outputs a control signal to a power supply source (not shown) of the filament 41 to control the heater output (power consumption) of the filament 41, thereby controlling the temperature of the filament 41 and the infrared radiation intensity. The control device 90 controls the temperature and flow rate of each gas discharged from the air supply port 14 and the nozzles 60, 70, and 85. The control device 90 also controls the humidity of the nitrogen gas discharged from the nozzle 70. In addition, the control device 90 includes a display operation unit such as a touch panel (not shown), and inputs an instruction from the worker or outputs information to the worker.

  Next, how the drying apparatus 1 configured in this manner dries the object to be dried 34 will be described. The drying apparatus 1 performs a process including a drying step of drying the material to be dried 34 by conveying the material to be dried 34 alternately passing through the irradiation section 55 and the non-irradiation section 56 multiple times. The dried product 34 is dried to produce a dried product. First, for example, when a processing start instruction is input from an operator, the control device 90 energizes the filament 41 to emit infrared rays, and at the same time, the temperature of each gas discharged from the air supply port 14 and the nozzles 60, 70, 85. And control the flow rate. Thereby, the control apparatus 90 adjusts so that the inside of space S1 may be in a predetermined state. Next, the control device 90 starts the conveyance of the material to be dried 34 by moving the belt 22 at a predetermined speed. The object to be dried 34 is irradiated with infrared rays from the infrared heater 40 in the irradiation section 55 while passing through the space S1 of the infrared drying furnace 1a, whereby components such as a solvent are evaporated and dried. Further, the material to be dried 34 is further dried by the hot air from the nozzle 85 while passing through the space S4 of the hot air drying furnace 1b. And the to-be-dried object 34 is dried, it becomes a dry body, and is carried out from the carrying-out port 81. FIG. Thereafter, the dried body is peeled from the PET film 32 and baked to form a baked body.

  In the drying apparatus 1 of the present embodiment described in detail above, since the shielding member 52 is present, there are a plurality of irradiation sections 55 and non-irradiation sections 56 alternately in the transport direction of the object to be dried 34 in the space S2. Existing. For this reason, when the object to be dried 34 is transported through the space S1, the object to be dried 34 is dried while alternately passing through the irradiation section 55 and the non-irradiation section 56 a plurality of times. Thereby, the drying apparatus 1 can reduce the variation in the temperature at the time of drying the to-be-dried object 34 by infrared rays. The reason for this will be described. First, when the material to be dried 34 includes a plurality of types of substances, the easiness of heating by the infrared rays may be different among the plurality of types of substances due to the difference in the infrared absorption rate among the plurality of types of substances. In this case, the temperature in the material to be dried 34 may vary due to irradiation with infrared rays, for example, a portion where many substances that are easily heated in the material to be dried 34 are unevenly distributed tends to become high temperature. Therefore, while the material to be dried 34 passes through the irradiation section 55, the temperature in the material to be dried 34 may vary due to infrared irradiation, and the local temperature difference may spread. However, while the object to be dried 34 passes through the non-irradiated section 56, the object to be dried 34 is hardly heated by infrared rays, and the temperature variation in the object to be dried 34 is reduced by heat conduction. For this reason, the irradiation sections 55 and the non-irradiation sections 56 are alternately present, so that, for example, the non-irradiation section 56 does not exist and the infrared ray is continuously irradiated. Variation in temperature can be reduced. In addition, since the drying speed varies when the temperature of the material to be dried 34 varies, there may be a problem such as non-uniform thickness of the material to be dried 34 (dry body) after drying. The drying apparatus 1 of the present embodiment can suppress such a problem of the dried body by reducing the variation in temperature when the object to be dried 34 is dried. In addition, although the dispersion | variation in the temperature in the to-be-dried material 34 in the irradiation area 55 can occur in any direction of the front-back direction, the left-right direction, and the up-down direction (thickness direction), the non-irradiation area 56 exists also in any direction. By doing so, the variation in temperature can be reduced. Moreover, if the non-irradiation section 56 does not exist and the infrared ray is continuously irradiated, the temperature of the material to be dried 34 may rise rapidly and become overdried. The drying apparatus 1 of the present embodiment can suppress such overdrying by the presence of the non-irradiation section 56.

  In addition, in the infrared drying furnace 1a, since it dries without using hot air, it can suppress that the surface of the to-be-dried object 34 becomes higher temperature than others. Therefore, variation in temperature in the thickness direction can be further reduced. In addition, when the surface of the object to be dried 34 becomes hotter than the others by using hot air, the solvent near the surface evaporates more, so that the binder may be deposited near the surface of the object to be dried 34. Then, the precipitated binder and raw material particles may act like a lid near the surface of the material to be dried 34 to inhibit the evaporation of the solvent. On the other hand, the infrared drying furnace 1a can also suppress the evaporation of the solvent by suppressing the precipitation of the binder by performing the drying without using hot air. In addition, although hot air is used in the hot air drying furnace 1b, since the drying of the material to be dried 34 is sufficiently advanced in the infrared drying furnace 1a, the above-described problem due to the surface of the material to be dried 34 having a higher temperature than the others. Is unlikely to occur.

  Further, the drying apparatus 1 includes a partition wall 50 disposed between an object to be dried 34 conveyed through the internal space of the furnace body 10 and the plurality of infrared heaters 40. The shielding member 52 constitutes a part of the partition wall 50. Further, the partition wall 50 includes a transmitting member 51 that is disposed so as to block the portion where the shielding member 52 does not exist, that is, the opening, and transmits infrared rays from the infrared heater 40 and allows irradiation of the irradiation section 55 with infrared rays. ing. Further, the partition wall 50 partitions the internal space of the furnace body 10, and the transmission member 51 partitions the internal space of the furnace body 10. Thereby, the shielding member 52 can be used as a part of the partition wall 50.

  It should be noted that the present invention is not limited to the above-described embodiment, and it goes without saying that the present invention can be implemented in various modes as long as it belongs to the technical scope of the present invention.

  For example, in the above-described embodiment, the shielding member 52 is also used as a part of the partition wall 50, but is not limited thereto. If the shielding member 52 can shield the infrared rays from the infrared heater 40 so that there are a plurality of irradiation sections 55 and non-irradiation sections 56 alternately along the conveying direction of the object to be dried 34 in the internal space of the furnace body 10, Any arrangement may be used. For example, the drying apparatus 1 may have a partition and a shielding member separately, and the drying apparatus 1 may have a shielding member without a partition. The drying apparatus 1 may include a shielding member arranged for each of the infrared heaters 40 in addition to or instead of the shielding member 52. FIG. 5 is an explanatory diagram of an infrared heater 140 including a shielding member 152 according to a modification. The infrared heater 140 includes a shielding member 152 disposed so as to cover only a part around the filament 41. The shielding member 152 is disposed on the outer surface of the infrared heater 140 (here, the outer surface of the outer tube 44). The infrared rays from the filament 41 of the infrared heater 140 are partially shielded by the presence of the shielding member 152, and the irradiation angle α of the infrared rays irradiated to the object to be dried 34 is limited to a predetermined value. Even when each of the plurality of infrared heaters 140 included in the drying apparatus 1 includes the shielding member 152, the irradiation sections 55 and the non-irradiation sections 56 can be alternately present as in the above-described embodiment, The same effect as the above-described embodiment can be obtained. The shielding member 152 may be a member bonded to the outer surface of the outer tube 44 and independent of the outer tube 44, or a film forming method such as coating, sputtering, CVD, or thermal spraying on the surface of the outer tube 44. It may be a shielding layer formed by using. For example, the shielding member 152 may be formed by coating the outer surface of the outer tube 44 with gold or aluminum.

  Further, in addition to or instead of the shielding member 152, a shielding member is disposed at a position away from the outer surface of the infrared heater 240 (here, the outer surface of the outer tube 44), such as the shielding member 252 of the modification of FIG. May be. Even when each of the plurality of infrared heaters 240 included in the drying apparatus 1 includes the shielding member 252, the irradiation sections 55 and the non-irradiation sections 56 can alternately exist as in the above-described embodiment. The same effect as the above-described embodiment can be obtained. However, since the entire infrared heater 240 including the shielding member can be easily reduced in size, it is preferable to dispose the shielding member 152 on the surface of the outer tube 44 as shown in FIG.

  Note that, like the shielding member 52, the shielding members 152 and 252 preferably reflect infrared rays. If it carries out like this, since the infrared rays after reflection by a shielding member will become easy to be utilized for at least one of the heating of the filament 41, and the heating of the to-be-dried object 34, energy efficiency improves. For example, if the shape of the cross section (the cross section shown in FIGS. 5 and 6) of the inner peripheral surfaces of the shielding members 152 and 252 is an arc, and the filament 41 is positioned at the center of a circle including the arc, the shielding members 152 and 252 Infrared rays reflected at 252 can be efficiently used for heating the filament 41. Further, for example, if the shape of the cross section (the cross section shown in FIG. 6) of the inner peripheral surface of the shielding member 252 is a parabolic shape and the filament 41 is positioned at the focal point, the infrared rays reflected by the shielding member 252 are dried. It can be efficiently used for heating the object 34.

  In the embodiment described above, the transmission member 51 may be omitted when the space S1 and the space S2 do not have to be completely separated. Even in this case, a plurality of irradiation sections 55 and non-irradiation sections 56 can be alternately present as in the above-described embodiment.

  In the embodiment described above, the filament 41 of the infrared heater 40 is a linear heating element, but is not limited thereto. For example, the drying device 1 may include an infrared heater having a planar heating element.

  In the embodiment described above, the drying apparatus 1 includes the plurality of infrared heaters 40, but it is only necessary to include one or more infrared heaters 40. For example, even when the drying apparatus 1 has only one infrared heater 40, if there are a plurality of openings of the shielding member 52 corresponding to the infrared heater 40, a plurality of irradiation sections 55 and non-irradiation sections 56 exist alternately. I can.

  In the above-described embodiment, the infrared heater 40 is disposed inside the furnace body 10, but is not limited thereto. For example, the infrared heater 40 may be disposed outside the furnace body 10. In this case, you may comprise a part of furnace body 10 with an infrared rays transmissive material so that the infrared rays from the infrared heater 40 can reach the inside of the furnace body 10. Further, when the infrared heater 40 is disposed outside the furnace body 10, the partition wall 50 does not need to be an internal partition wall that partitions the interior space of the furnace body 10, and an object to be dried conveyed in the interior space of the furnace body 10. It is only necessary that the partition wall 50 be disposed between 34 and the infrared heater 40. For example, the infrared heater 40 may be disposed above the outside of the furnace body 10, and the ceiling portion of the furnace body 10 may be configured by the transmissive member 51 and the shielding member 52, similarly to the partition wall 50. That is, the shielding member and the transmission member may be used as a part of the furnace body 10. In this case, the ceiling portion of the furnace body 10 corresponds to “a partition wall disposed between an object to be dried conveyed in the internal space of the furnace body and the one or more infrared heaters”.

  In the above-described embodiment, each of the plurality of transmission members 51 is disposed so as to close each of the plurality of openings of the shielding member 52, but is not limited thereto. For example, one transmissive member 51 may be disposed so as to cover the entire upper end surface of the shielding member 52, and the plurality of openings may be closed by the single transmissive member 51.

  In the embodiment described above, the space below the partition wall 50 is partitioned into the space S1 and the space S3 by the belt 22, but the space S1 and the space S3 may communicate with each other.

  In the embodiment described above, the shielding member 52 may have a vertically extending portion provided around the opening so as to prevent the passage of infrared rays from other than the infrared heater 40 corresponding to the opening. Good. FIG. 7 is an explanatory diagram of a shielding member 352 according to a modification. As shown in FIG. 7, the shielding member 352 has a main body 352a similar to the shielding member 52 shown in FIG. 4, and a standing portion that is disposed around the opening of the main body 352a and extends upward from the main body 352a. 352b. The standing portion 352b is a flat plate-like member, and is provided one before and after the opening portion with respect to each opening portion of the main body portion 352a. The standing portion 352b is made of the same material as the main body portion 352b, for example. The standing portion 352b is positioned so as not to prevent infrared rays from reaching the irradiation portion 55 and the opening corresponding to the infrared heater 40 from the infrared heater 40 (in FIG. 7, the opening directly below the infrared heater 40). . On the other hand, the upright portion 352b is appropriately adjusted in the vertical length so that the infrared heater 40 other than the infrared heater 40 corresponding to the opening of the main body 352a (in FIG. 7, other than directly above the opening) Infrared rays from the infrared heater 40) located at the position cannot be linearly reached without being reflected.

DESCRIPTION OF SYMBOLS 1 Drying apparatus, 1a Infrared drying furnace, 1b Hot air drying furnace, 10 Furnace body, 11 Carrying in port, 12 Carrying out port, 13 Exhaust port, 14 Air supply port, 15 Exhaust port, 20 Belt conveyor, 22 Belt, 30 Guide roll, 32 PET film, 34 Dried object, 40, 140, 240 Infrared heater, 41 Filament, 42 Inner tube, 43 Heater body, 44 Outer tube, 46 Refrigerant flow path, 48 Cap, 50 Bulkhead, 51 Transmission member, 52, 152 , 252, 352 shielding member, 55 irradiation section, 56 non-irradiation section, 60 nozzles, 70 nozzles, 80 furnace body, 81 carry-out port, 82 exhaust port, 83 air supply port, 84 exhaust port, 85 nozzle, 90 control device, 352a Body part, 352b Standing part, S1-S4 space.

Claims (6)

A drying device for drying an object to be dried,
A furnace body;
Transport means for transporting the material to be dried in the transport direction in the internal space of the furnace body;
One or more infrared heaters capable of radiating infrared rays to an object to be dried conveyed through the internal space of the furnace body;
In the internal space of the furnace body, an irradiation section in which infrared rays emitted from the infrared heater are irradiated on the object to be dried and a non-irradiation section in which the object to be dried is not irradiated are alternately arranged along the transport direction. A shielding member for shielding infrared rays from the infrared heater,
Drying device equipped with. The drying apparatus according to claim 1,
A partition wall disposed between an object to be dried and the one or more infrared heaters conveyed through the internal space of the furnace body;
With
The shielding member constitutes a part of the partition;
The partition wall is provided so as to close a portion where the shielding member does not exist, and has a transmission member that transmits infrared light from the infrared heater and allows infrared irradiation to the irradiation section.
Drying equipment. A plurality of the infrared heaters are arranged along the transport direction,
The shielding member is disposed so as to cover only a part of the periphery of each of the plurality of infrared heaters.
The drying apparatus according to claim 1. The infrared heater includes a heating element that emits infrared rays when heated, and a transmission tube that surrounds the heating element and transmits infrared rays from the heating element,
The shielding member is disposed on the surface of the transmission tube.
The drying apparatus according to claim 3. The shielding member reflects infrared rays;
The drying apparatus according to claim 3 or 4. Drying the object to be dried by transporting the object to be dried so as to pass through an irradiation section where infrared rays are irradiated to the object to be dried and a non-irradiation section where the object to be dried is not irradiated alternately alternately several times. Drying process,
The manufacturing method of the dry body containing this.

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