JP5648499B2 - Drying equipment - Google Patents

Description

  The present invention relates to a drying apparatus for drying a paste applied on a surface of a foil.

Conventionally, the technique of the drying apparatus using an electric far-infrared heater is publicly known (for example, refer to patent documents 1).
The drying apparatus of Patent Document 1 generates far infrared rays by energizing a far infrared heater arranged in a drying furnace, and dries the paste coated on the foil. This far-infrared heater has a structure in which a sheathed heater is placed inside a ceramic-coated metal, and the sheathed heater is heated to heat the metal from the inside, thereby heating the ceramic and generating far-infrared rays. An explosion-proof structure of the drying furnace is realized by providing the heater energization terminal in an independent area outside the drying furnace.
When drying a paste containing an oil-based solvent using such a drying apparatus, it is necessary to ventilate the inside of the drying furnace and exhaust the oil atmosphere. Further, the exhaust gas containing the vaporized oil is cooled, and after separating the oil, it is reused for ventilation or opened to the atmosphere.

However, since the drying apparatus of Patent Document 1 employs a configuration in which a far-infrared heater is disposed in a drying furnace, the heater is heated to a temperature near where infrared rays are effectively generated (for example, about 400 ° C. for ceramics). When heating, the temperature in a drying furnace will inevitably rise. Along with this, the temperature of the air supplied into the furnace for ventilation also rises and the saturated vapor pressure also rises, so that the drying energy of the ventilation air is lowered and the energy efficiency is deteriorated.
Furthermore, since it is necessary to suppress the temperature rise in the drying furnace configured as an explosion-proof layer, it is necessary to strictly control the temperature and air volume of the air supplied during ventilation, and the device configuration and control configuration are complicated. Become.

JP 2003-251252 A

  It is an object of the present invention to provide a drying apparatus that improves the drying efficiency of ventilation air in an explosion-proof layer and realizes an explosion-proof structure with a simple configuration.

The drying apparatus of the present invention includes a heating layer including a far infrared heater that generates far infrared rays, and an explosion-proof layer provided independently of the heating layer, and the explosion-proof layer is generated in the heating layer. A drying device that introduces far-infrared rays and dries a paste containing an oil-based solvent, and prevents heat of the heating layer from being transferred to the explosion-proof layer between the heating layer and the explosion-proof layer. An air supply / exhaust system for ventilating the atmosphere in the explosion-proof layer is provided on the side opposite to the heating layer side in the explosion-proof layer, and the supply / exhaust system has an extended portion. In addition, the extension portion allows air to flow in parallel to the paste coating surface in the explosion-proof layer.

  Air for ventilating the inside of the heat insulating layer is circulated inside the heat insulating layer, and the air after passing through the heat insulating layer is preferably used on the air supply side of the air supply / exhaust system.

  It is preferable that the heating layer, the heat insulating layer, and the explosion-proof layer are located in this order from above.

  ADVANTAGE OF THE INVENTION According to this invention, the drying efficiency by the ventilation air in an explosion-proof layer can be improved, and an explosion-proof structure is realizable with a simple structure.

It is a side view of a drying apparatus. It is a front view of a drying apparatus. It is a figure which shows embodiment in the case of utilizing the air from a heat insulation layer for the supply side of the ventilation air of a supply / exhaust system. It is a figure which shows another embodiment of a drying apparatus.

Hereinafter, a drying apparatus 1 according to an embodiment of the present invention will be described with reference to the drawings. The drying device 1 is a facility for drying the paste 3 applied to the surface of the foil 2. The foil 2 with the paste 3 coated on the upper surface is continuously conveyed into the drying device 1 and a predetermined amount of heat is applied in the device so that the paste 3 is sufficiently dried after passing through the drying device 1. .
The drying device 1 is configured in a three-layer structure including a heating layer 5, a heat insulating layer 6, and an explosion-proof layer 7 in order from the top. The heating layer 5, the heat insulating layer 6, and the explosion-proof layer 7 are isolated and formed as independent spaces (regions). The foil 2 coated with the paste 3 on the upper surface is conveyed to the explosion-proof layer 7, and the paste 3 is dried in the explosion-proof layer 7.
The paste 3 of the present embodiment is a paste material containing an oil-based solvent such as a battery electrode material, for example, and the explosion-proof layer 7 configured as a drying furnace does not include a fire type and has a ventilation facility, and the ignition temperature of the solvent It has an appropriate explosion-proof structure, such as preventing the temperature from rising above.

As shown in FIGS. 1 and 2, the drying apparatus 1 includes a far infrared heater 10. The far-infrared heater 10 is an electric heater that radiates far-infrared IR and is disposed in the heating layer 5. The far infrared heater 10 includes energization terminals 11 and 11, a sheathed heater 12, a heating element 13, and a ceramic 14.
The energization terminals 11 and 11, the sheathed heater 12, and the heating element 13 are disposed in the heating layer 5, and the ceramic 14 is disposed to face the heat insulating layer 6 from the heating layer 5. That is, it is fixed in a state in which a part of the lower surface of the ceramic 14 protrudes from the heating layer 5 into the heat insulating layer 6.

The sheathed heater 12 is an electric heater provided in the heating element 13 and heated by energizing the energizing terminals 11. The heating element 13 is a structure made of an appropriate metal material, and is fixed in a state where the plate-like ceramic 14 is in contact with the lower surface thereof. Thus, since the ceramic 14 is brought into contact with one surface of the heating element 13, the heat of the heating element 13 can be efficiently transmitted to the ceramic 14.
In the far infrared heater 10, the sheath heater 12 is heated by energizing the energization terminals 11, 11, the heating element 13 is heated by the sheath heater 12, and the ceramic 14 is heated. Radiated. The ceramic 14 is formed to have a width equivalent to the coating width of the paste 3, and the ceramic 14 and the paste 3 face each other in almost the entire area in the drying apparatus 1, and the far infrared IR is good. The paste 3 can be transmitted.
Moreover, you may comprise the heat generating body 13 and the ceramic 14 integrally. In other words, the ceramic coating may be provided on the lower surface of the heating element 13 so that the ceramic 14 exists as a coating layer on the lower surface of the heating element 13, and the far infrared IR is emitted from the lower surface of the far infrared heater 10. Can be adopted.

Far-infrared IR generated in the heating layer 5 is introduced into the explosion-proof layer 7 through the heat insulating layer 6.
Air is circulated inside the heat insulating layer 6, and the inside of the layer is ventilated. That is, by adjusting the inside of the heat insulating layer 6 with air having a small heat transfer coefficient, the heat effect received from the heating layer 5 is reduced, and the temperature in the heat insulating layer 6 is adjusted so as not to rise above a predetermined temperature. . Moreover, by providing the heat insulation layer 6 between the heating layer 5 and the explosion-proof layer 7, the heat of the heating layer 5 is suppressed from being transmitted to the explosion-proof layer 7, and the temperature rise of the explosion-proof layer 7 is prevented. .

A window 20 made of a material that transmits far-infrared IR such as quartz glass is provided at a boundary portion between the heat insulating layer 6 and the explosion-proof layer 7 (a partition wall separating the heat insulating layer 6 and the explosion-proof layer 7). That is, the far-infrared IR radiated from the ceramic 14 disposed at the boundary between the heating layer 5 and the heat insulating layer 6 is transmitted through the window 20 and into the explosion-proof layer 7.
Further, since the heat insulating layer 6 is filled with air, the far-infrared IR is not easily absorbed in the heat insulating layer 6 and is introduced into the explosion-proof layer 7 while maintaining the strength in the heating layer 5. The far-infrared IR introduced into the explosion-proof layer 7 is absorbed by the paste 3. Thereby, the paste 3 is warmed from the inside and dried.

The foil 2 coated with the paste 3 is conveyed to the explosion-proof layer 7 so that the coated surface of the paste 3 is the upper surface, and the paste 3 is dried in the explosion-proof layer 7.
As described above, the far-infrared IR generated by the far-infrared heater 10 is introduced into the explosion-proof layer 7, and the far-infrared IR is applied to the paste 3 on the foil 2 conveyed into the explosion-proof layer 7. As a result, the paste 3 absorbs far-infrared IR and is warmed from the inside. When the paste 3 is warmed, the solvent and the like are evaporated (vaporized), and the paste 3 is dried.

The explosion-proof layer 7 includes a supply / exhaust system 30. The air supply / exhaust system 30 exhausts the vaporized solvent generated when the paste 3 is dried by supplying and exhausting air to and from the explosion-proof layer 7 to ventilate the oil atmosphere in the explosion-proof layer 7.
The air supply / exhaust system 30 includes an air supply duct 31 and an exhaust duct 32. By supplying air from the air supply duct 31 and exhausting from the exhaust duct 32, the inside of the explosion-proof layer 7 is ventilated. The air supply duct 31 and the exhaust duct 32 are disposed below the explosion-proof layer 7 (the bottom of the drying device 1) and are provided along the longitudinal direction of the drying device 1. In other words, the air supply duct 31 and the exhaust duct 32 are provided in the explosion-proof layer 7 on the side opposite to the heating layer 5 and the heat-insulating layer 6, and the extension length extends over substantially the entire longitudinal direction of the explosion-proof layer 7.
The air supply duct 31 extends to the outside of the drying device 1 and is connected to an appropriate air blower (not shown) for supplying air. The exhaust duct 32 extends to the outside of the drying device 1 and is connected to an appropriate suction device (not shown) for discharging air.

A part of the air supply duct 31 extends upward along the wall surface of the explosion-proof layer 7, and has an air supply port group 33 in the extended part. A portion of the exhaust duct 32 extends upward along the wall surface on the opposite side of the extended portion of the air supply duct 31 (in other words, so as to face the extended portion of the air supply duct 31). The exhaust port group 34 is provided at the extended portion.
The air supply port group 33 is an opening group formed along the longitudinal direction of the air supply duct 31, and the exhaust port group 34 is an opening group formed along the longitudinal direction of the exhaust duct 32. The air supply duct 31 and the inside of the explosion-proof layer 7 communicate with each other through the air supply port group 33, and the inside of the exhaust duct 32 and the explosion-proof layer 7 communicate with each other through the exhaust port group 34.

The air supply port group 33 and the exhaust port group 34 are arranged on both wall surfaces facing each other along the longitudinal direction of the explosion-proof layer 7 and are provided so as to face each other with the paste 3 to be dried interposed therebetween. The air flows in the width direction of the explosion-proof layer 7 (short direction of the foil 2 conveyed in the explosion-proof layer 7), that is, flows linearly in the explosion-proof layer 7 through the shortest path, and ventilation efficiency can be improved.
Further, an exhaust duct 32 through which exhaust gas containing vaporized oil from the paste 3 circulates is provided at the bottom of the drying apparatus 1 and is disposed at a position farthest from the heating layer 5 that is most heated in the drying apparatus 1. By doing so, the temperature rise of the explosion-proof layer 7 (especially the exhaust gas containing the oil in the exhaust duct 32) can be suppressed, and the explosion-proof property of the drying apparatus 1 can be made more reliable.

In the air supply / exhaust system 30 configured as described above, the air supplied into the explosion-proof layer 7 through the air supply duct 31 is heated within the explosion-proof range (for example, about 100 ° C.) and is sufficiently dried. Supplied in. That is, by using dry air as air for ventilation, the oil and moisture of the vaporized solvent contained in the atmosphere in the explosion-proof layer 7 are absorbed well, the explosion-proof layer 7 is ventilated, and the wetness is adjusted. The drying of the paste 3 is promoted.
Further, since the exhaust gas discharged from the exhaust duct 32 contains the oil content of the paste 3, it is cooled to about 20 ° C., condensed and recovered, and then reused or released to the atmosphere as the supply air. As described above, the air supply / exhaust system 30 uses a sufficiently dry air (heated to about 100 ° C.) as air supply, and cools the oil to a condensation temperature (about 20 ° C.) after exhaust. As a result, the drying energy can be utilized to the maximum and efficient drying can be realized.

Furthermore, as shown in FIG. 2, the air for ventilation by the air supply / exhaust system 30 extends along the extending direction of the foil 2 from the air supply port group 33 of the air supply duct 31 (along the width direction of the explosion-proof layer 7). It is configured to flow toward the exhaust duct 32 through the exhaust port group 34 located on the opposite side of the flow and the layer.
That is, the air for ventilation in the explosion-proof layer 7 is set to flow parallel to the coating surface of the paste 3 in the foil 2 and blows (collises) with the coating surface of the paste 3 at a large angle. It is set so that there is nothing. As described above, in the explosion-proof layer 7, the ventilation air is caused to flow in a direction parallel to the coating surface of the paste 3, thereby suppressing the drying on the surface of the paste 3, and the occurrence of migration in the paste 3. Is preventing.
Moreover, since the drying apparatus 1 is configured as a far-infrared drying furnace, the paste 3 can be heated and dried from the inside, and the occurrence of migration in the paste 3 can be more reliably prevented.

  Further, in the drying device 1, the heating layer 5, the heat insulating layer 6, and the explosion-proof layer 7 are arranged in this order from above, and the explosion-proof layer 7 is arranged at a position away from the heating layer 5, and a supply / exhaust system is provided below the explosion-proof layer 7. By arranging 30, an effective explosion-proof structure can be realized with a simple configuration, and the space below the drying device 1 that has not been conventionally used as a dead space can be effectively used. Can be suppressed.

As shown in FIG. 3, it is preferable to use the air flowing through the heat insulating layer 6 on the air supply side of the air supply / exhaust system 30 of the explosion-proof layer 7.
Specifically, by connecting an exhaust passage 40 for exhausting air supplied into the heat insulating layer 6 to an air supply duct 31 of the air supply / exhaust system 30, part or all of the air supply of the air supply / exhaust system 30 is performed. It is preferable to use as.

As described above, heat insulating air is supplied and filled in the heat insulating layer 6 so as to suppress the temperature rise in the layer. As described above, the temperature of the air supplied into the heat insulating layer 6 rises due to the heat of the far-infrared heater 10, that is, the influence of heat generation (heat transfer) of the heating element 13 and the ceramic 14. And when discharged | emitted from the heat insulation layer 6, it will rise rather than the temperature at the time of supply.
By using the air whose temperature has risen as part or all of the air supply of the air supply / exhaust system 30, the energy cost required when the air supply temperature of the air supply / exhaust system 30 is raised can be reduced.

The drying apparatus 1 may be configured to convey a plurality of rows of foils 2, 2.
For example, the embodiment depicted in FIG. 4 shows a drying device 1 that transports two rows of foils 2, 2 to an explosion-proof layer 7 and dries pastes 3, 3 coated on the foils 2, 2. . In the drying apparatus 1, the heating layer 5 including the far infrared heater 10 and the heat insulating layer 6 including the window 20 are arranged in parallel along the longitudinal direction of the drying apparatus 1 so as to face each foil 2 (paste 3). A far-infrared heater 10 is prepared, and foils 2 and 2 each having a paste 3 coated on the upper surface thereof are conveyed to a common explosion-proof layer 7. That is, the drying apparatus 1 shown in FIG. 4 has a structure including two heating layers 5 and 5 and heat insulating layers 6 and 6 and one explosion-proof layer 7 corresponding to the number of rows of the foil 2 to be conveyed.
That is, also in the drying apparatus 1 of the present embodiment, the explosion-proof layer 7 is disposed at a position away from the heating layers 5 and 5 including the current-carrying terminal, thereby eliminating the fire type of the current-carrying terminal from the explosion-proof layer 7 and flammability. In addition, the excessive temperature rise in the explosion-proof layer 7 can be prevented and ignitability can be considered.

In addition, in the air supply / exhaust system 30 of the drying apparatus 1 shown in FIG. An air flow from the center toward both ends is formed.
Thus, also in the drying apparatus 1 of the multiple-row conveyance, by flowing the air flow in the explosion-proof layer 7 formed by the air supply / exhaust system 30 in parallel with the coating surface of the paste 3. Generation | occurrence | production of the migration of the paste 3 by the collision flow by the air for ventilation can be suppressed, and coating quality can be ensured.

  As described above, the drying apparatus 1 that transports a plurality of foils 2, 2... And dries the paste 3 coated on each foil 2 is the same as that of the above-described one-row transportation embodiment. The effect is obtained.

DESCRIPTION OF SYMBOLS 1 Drying device 2 Foil 3 Paste 5 Heating layer 6 Heat insulation layer 7 Explosion-proof layer 10 Far-infrared heater 20 Window 30 Supply / exhaust system

Claims (3)

A heating layer including a far-infrared heater that generates far-infrared rays, an explosion-proof layer provided independently of the heating layer, and introducing far-infrared rays generated in the heating layer into the explosion-proof layer, A drying apparatus for drying a paste containing an oil-based solvent,
Between the heating layer and the explosion-proof layer, the heat of the heating layer is prevented from being transmitted to the explosion-proof layer, and includes a heat insulating layer that transmits the far infrared rays,
A supply / exhaust system for ventilating the atmosphere in the explosion-proof layer is provided on the side opposite to the heating layer side in the explosion-proof layer, the supply / exhaust system includes an extension part, and the extension part is in the explosion-proof layer. A drying device that allows air to flow parallel to the paste coating surface. Inside the heat insulation layer, air for ventilating the heat insulation layer is circulated,
The drying apparatus according to claim 1, wherein the air after passing through the heat insulating layer is used on an air supply side of the air supply / exhaust system.   The drying apparatus according to claim 1 or 2, which is located in the order of a heating layer, a heat insulating layer, and an explosion-proof layer from above.

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