Heat treatment equipment

Abstract

To stabilize the transfer of a sheet between belts.SOLUTION: A heat treatment apparatus 10 comprises a first belt 30, a heating furnace 20, a roller 31, a second belt 40 and an air blowing device 50. The first belt 30 runs along a pre-determined running passage and conveys a sheet A. The heating furnace 20 covers a part of the running passage of the first belt 30. The roller 31 is provided at the downstream side than the heating furnace 20 in the running passage. The roller 31 folds the first belt 30. The second belt 40 is arranged so as to be adjacent to a folded region 30a where the first belt 30 is folded by the roller 31. The air blowing device 50 blows air onto the folded region 30a.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] This disclosure relates to a heat treatment apparatus.

Background Art

[0002] Japanese Patent Application Laid-Open No. 2006-077272 discloses a manufacturing apparatus for a metal porous sintered body, which includes a heating furnace, a furnace gas discharge path, a combustion chamber, a regenerated gas introduction path, and a gas analyzer. In the manufacturing apparatus disclosed in this publication, a mesh belt for moving a green sheet from the inlet portion to the outlet portion of the heating furnace is provided.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] A sheet that is heat-treated while being conveyed on a belt may be transferred to another belt after heating.

Means for Solving the Problems

[0005] The heat treatment apparatus disclosed herein includes a first belt, a heating furnace, a roller, a second belt, and an air spraying device. The first belt travels along a predetermined travel path and conveys a sheet. The heating furnace covers a part of the travel path of the first belt. The roller is provided downstream of the heating furnace in the travel path. The roller folds back the first belt. The second belt is disposed close to the folding region where the first belt is folded back by the roller. The air spraying device sprays air into the folding region. In such heat treatment, the transfer of the sheet between the belts is stabilized.

Brief Description of the Drawings

[0006] [Figure 1] Figure 1 is a schematic diagram showing the heat treatment apparatus 10. [Figure 2] Figure 2 is a schematic diagram showing the heat treatment apparatus 10. [Figure 3] Figure 3 is a schematic diagram of a heat treatment apparatus 10A according to another embodiment. [Figure 4] Figure 4 is a schematic diagram of a heat treatment apparatus 10B according to another embodiment. [Modes for carrying out the invention]

[0007] Hereinafter, one embodiment of the present disclosure will be described in detail with reference to the drawings. In the following drawings, members and parts that perform the same function are denoted by the same reference numerals. Also, the dimensional relationships (length, width, thickness, etc.) in each figure do not reflect the actual dimensional relationships. The directions of up, down, left, right, front, and back are represented by the arrows U, D, L, R, F, and Rr in the figures, respectively. Hereinafter, the directions of up, down, left, right, front, and back are defined only for the convenience of explanation and do not limit the present invention unless otherwise specified.

[0008] Figures 1 and 2 are schematic diagrams of the heat treatment apparatus 10. In Figures 1 and 2, the direction in which sheet A is conveyed is indicated by arrows. Figure 2 schematically shows how sheet A is transferred from the first belt 30 to the second belt 40. In Figure 2, the direction of the air blown from the air blowing device 50 is indicated by a white arrow.

[0009] <Heat treatment apparatus 10> As shown in Figure 1, the heat treatment apparatus 10 comprises a first belt 30, a heating furnace 20, a roller 31, a second belt 40, and an air blowing device 50. The heat treatment apparatus 10 is further equipped with an anti-static device 60. The heat treatment apparatus 10 is a device for heating and processing sheet-shaped workpieces (hereinafter also simply referred to as "sheets"). In the heat treatment apparatus 10, multiple sheets A are sequentially conveyed and processed continuously.

[0010] The sheet-like workpiece processed by the heat treatment apparatus 10 is not particularly limited. The sheet-like workpiece may be, for example, a resin composition containing a resin component. The resin composition may be, for example, a silicone resin, a polyimide resin, etc. The resin composition may also contain materials other than the resin component. The resin composition may contain, for example, inorganic fillers, ceramic powder, etc. The thickness of sheet A is not particularly limited. The thickness of sheet A may be, for example, 10 mm or less, 1.0 mm or less, or 0.3 mm or less. The thickness of sheet A may be, for example, 10 μm or more, 30 μm or more, or 50 μm or more.

[0011] <Belt 1, 30> The first belt 30 travels along a predetermined path to transport the sheet A. In this embodiment, the first belt 30 is a mesh belt made of glass fibers coated with fluororesin. The fluororesin coating on the first belt 30 makes it easy for the sheet A to peel off from the first belt 30. A mesh belt is a belt woven in a mesh-like pattern. The fact that the first belt 30 is a mesh belt makes it easy for the sheet A to peel off from the first belt 30. Note that the first belt 30 is not limited to a mesh belt. The material of the first belt 30 may be appropriately selected according to the composition and processing conditions of the sheet A, and is not particularly limited. The material of the first belt 30 may be, for example, ceramic, resin, etc.

[0012] The first belt 30 is an annular belt without ends, a so-called endless belt. Sheet A is transported with the sheet resting on the outer surface of the first belt 30. The first belt 30 is wound around rollers 31-34 under the required tension. Rollers 31-34 are made of metal, for example, stainless steel. The fact that rollers 31-34 are made of metal can reduce static electricity that may be generated on the first belt 30.

[0013] The first belt 30 may be placed over a tension roller (not shown) for adjusting the tension. A drive unit 35 is connected to the roller 34 to drive the first belt 30. The drive unit 35 drives the first belt 30 counterclockwise by rotating the roller 34. For example, a servo motor may be used as the drive unit 35. The conveying speed of the first belt 30 may be adjusted by controlling the rotation speed of the servo motor acting as the drive unit 35.

[0014] The drive unit 35 rotates the roller 34. As the roller 34 rotates, the first belt 30 is driven in a predetermined direction. The rollers 31 to 33 on which the first belt 30 is stretched rotate passively via the first belt 30. The travel path of the first belt 30 is set by the rollers 31 to 34.

[0015] In this embodiment, the upper ends of roller 31 and roller 34 are set at approximately the same height. Therefore, the travel path from roller 34 to roller 31 is set to be approximately horizontal. However, the sheet A does not necessarily need to be transported horizontally. The path along which the sheet A is transported may be inclined. Support rollers that support the first belt 30 from below may be provided in the travel path. The sheet A is supplied to the first belt 30 by a sheet supply device (not shown) provided upstream of the heating furnace 20. The sheet A supplied to the first belt 30 is transported along the travel path of the first belt 30. The heating furnace 20 is provided in part of the travel path of the first belt 30.

[0016] <Heating furnace 20> The heating furnace 20 is equipment for heat-treating sheet A. The heating furnace 20 covers a portion of the travel path of the first belt 30. The heating furnace 20 surrounds the first belt 30 between roller 31 and roller 34. The heating furnace 20 is equipped with a tunnel-shaped furnace body 22. Inside the furnace body 22, a processing space 20a is formed where sheet A is conveyed and processed from the inlet 22a to the outlet 22b. The first belt 30 passes through the heating furnace 20, and sheet A is continuously heated as it is conveyed.

[0017] A heater 24 is provided in the processing space 20a. The heater 24 is a device for heating the workpiece. The heater 24 may be provided above and below the first belt 30. Various types of heaters can be used as the heater 24 depending on the heating conditions, etc. For example, a cylindrical ceramic heater, a metal sheath heater, etc. may be used as the heater 24. The shape of the heater is not particularly limited, and for example, a plate-shaped panel heater may be used. A hot air heating type heater may be used as the heater 24. The heating furnace 20 may be connected to supply air piping and exhaust piping to control the atmosphere in the processing space 20a. Air curtains may be provided at the inlet 22a and outlet 22b of the heating furnace 20 to maintain the atmosphere in the processing space 20a.

[0018] The furnace body 22 is constructed of insulating material around its entire circumference in the direction of transport. The furnace body 22 may be constructed, for example, by stacking ceramic fiber boards that have been molded into a predetermined shape. The ceramic fiber board is, for example, a plate material formed into a plate shape by adding inorganic fillers and inorganic-organic binders to so-called bulk fiber. The thickness of the furnace wall is set to a required thickness such that the heat of the processing space 20a is sufficiently insulated.

[0019] Note that various facilities can be provided upstream and downstream of the heating furnace 20 in the heat treatment apparatus 10. For example, an apparatus for preheating the sheet A before heat treatment in the heating furnace 20 may be provided upstream of the heating furnace 20. A soaking apparatus for soaking the sheet A heat-treated in the heating furnace 20, a cooling apparatus for cooling the sheet A heat-treated in the heating furnace 20, etc. may be provided downstream of the heating furnace 20.

[0020] By being heat-treated, the adhesion of the sheet A to the first belt 30 may increase. As a result, it may become easier to stick to the first belt 30. Further, the sheet A after heat treatment may become likely to stick to the first belt 30 due to static electricity.

[0021] The first belt 30 that has passed through the heating furnace 20 is folded back on the downstream side of the traveling path from the heating furnace 20. A sensor 55 for detecting the passage of the sheet A may be provided on the downstream side of the heating furnace 20. The sensor 55 is provided between the outlet 22b of the heating furnace 20 and the position where an air spraying device 50 described later sprays air. The sensor 55 detects that the leading end A1 of the sheet A has reached a predetermined detection position 55a (see FIG. 2) in front of the folding region 30a.

[0022] 〈Roller 31〉 The roller 31 is a roller that folds back the first belt 30. The roller 31 is provided on the downstream side of the heating furnace 20 in the traveling path. The first belt 30 is folded back from the roller 31 toward the roller 32. In this embodiment, the first belt 30 is folded back downward and rearward by the roller 31. In this embodiment, a static eliminator 60 is provided above the roller 31.

[0023] 〈Static eliminator 60〉 The static elimination device 60 is a device that eliminates static electricity from sheet A and the first belt 30. The static elimination device 60 is installed between the outlet 22b of the heating furnace 20 and the position where the air blowing device 50, which will be described later, blows air. The static elimination device 60 is installed in a position facing the outer surface of the first belt 30. Here, the static elimination device 60 is installed above the roller 31.

[0024] The static elimination device 60 eliminates static electricity from sheet A and the first belt 30 above the roller 31. The static elimination device 60 eliminates static electricity from sheet A and the first belt 30 upstream of the folded region 30a that is folded back by the roller 31. Sheet A and the first belt 30 are eliminated at the boundary between the region where the first belt 30 is in contact with the roller 31 (folded region 30a) and the region where it is not in contact.

[0025] In this embodiment, the static elimination device 60 is a device that blows ionized static elimination air 60a (see Figure 2) onto the outer surface of the first belt 30. The static elimination air 60a is directed from the static elimination device 60, which is positioned above the roller 31, onto the first belt 30 as it passes over the roller 31. By eliminating static electricity from the sheet A without contact, the quality of the sheet A is more easily maintained. The static elimination device 60 is not particularly limited as long as it can eliminate static electricity from the first belt 30. For example, a DC static elimination device, an AC static elimination device, a pulse-type static elimination device, a static elimination brush, a static elimination string, etc., may be used as the static elimination device 60. The static elimination device 60 is not essential for the heat treatment apparatus 10.

[0026] As shown in Figure 2, after the sheet A is discharged, it is passed from the first belt 30 to the second belt 40 in the folding region 30a where the first belt 30 is folded back by the roller 31. Here, the folding region 30a is the region of the first belt 30 that is in contact with the roller 31.

[0027] <Belt 2, 40°> The second belt 40 is positioned close to the folding region 30a where the first belt 30 is folded back by the roller 31. The second belt 40, like the first belt 30, is an annular belt without ends. After being transferred from the first belt 30, sheet A is transported while resting on the outer surface of the second belt 40. The configuration of the second belt 40 may be the same as or different from that of the first belt 30. The second belt 40 may be made of a belt with lower heat resistance compared to the first belt 30.

[0028] The second belt 40 is driven by a drive device (not shown). The configuration of the drive device that drives the second belt 40 can be the same as that of the drive device 35 (see Figure 1), so a detailed explanation is omitted. The travel path of the second belt 40 is set by rollers 41 and 42 (see Figure 1). Sheet A is conveyed approximately horizontally from roller 41 to roller 42. The upper ends of rollers 41 and 42 are set at approximately the same height. A support roller may be provided between rollers 41 and 42 to support the second belt 40 from below.

[0029] Roller 41 is positioned such that its upper end is lower than the upper end of roller 31. In this embodiment, the second belt 40 is positioned below the axis of rotation of roller 31. The upper end of roller 41 is positioned lower than the front end of roller 31. This facilitates the transfer of sheet A from the first belt 30 to the second belt 40. The heat-treated sheet A, conveyed on the second belt 40, can be recovered by a recovery device (not shown).

[0030] A gap G is formed between the folded region 30a of the first belt 30 and the second belt 40. The dimensions of the gap G can be determined by the distance between the rollers 31 and 41 and the thicknesses of the first belt 30 and the second belt 40. Although not particularly limited, the dimensions of the gap G are set to be greater than the thickness of sheet A. The gap G may be 10 mm or less, for example, 5 mm or less. The gap G may be 1 mm or more, for example, 2 mm or more.

[0031] Sheet A is passed from the first belt 30 to the second belt 40 across the gap G formed between the first belt 30 and the second belt 40. In the heat treatment apparatus 10, when sheet A is passed from the first belt 30 to the second belt 40, air is blown onto the folded region 30a.

[0032] <Air blowing device 50> The air blowing device 50 blows air onto the folded area 30a. The air blowing device 50 has an opening 51 formed in the direction from which the air is blown. The opening 51 may be an elongated hole along the width direction of the sheet A (the direction perpendicular to the direction in which the sheet A is conveyed). The air blowing device 50 blows air onto the folded area 30a when the sheet A is handed over so as to lift the sheet A away from the first belt 30. The air blowing device 50 blows air onto the lower surface A2 of the sheet A, which is in contact with the first belt 30 and the second belt 40, when the sheet A is handed over. In this embodiment, the air blowing device 50 is connected to a compressor that supplies compressed air. The air blowing device 50 is not limited to this configuration.

[0033] In this embodiment, the air blowing device 50 is positioned below the roller 31. The air blowing device 50 is positioned below the roller 41. The opening 51 of the air blowing device 50 is positioned upward and directed toward the gap G. The air blowing device 50 blows air toward the gap G. The air is blown in the direction opposite to the direction in which the first belt 30 travels. The air is blown in the direction along the direction in which the second belt 40 travels. The air is blown into the return region 30a along the first belt 30 that passes through the gap G and returns to the roller 31.

[0034] Incidentally, sheets processed in the heating furnace may stick to the first belt. In this case, a transfer failure may occur where the sheet follows the first belt while stuck to it, and is not transferred to the second belt. Such failures are particularly likely to occur when the sheet is thin or when the sheet is soft after heat treatment.

[0035] In the embodiment described above, the heat treatment apparatus 10 comprises a first belt 30, a heating furnace 20, a roller 31, a second belt 40, and an air blowing device 50. The first belt 30 travels along a predetermined path to transport the sheet A. The heating furnace 20 covers a portion of the travel path of the first belt 30. The roller 31 is located downstream of the heating furnace 20 in the travel path. The roller 31 folds the first belt 30 back. The second belt 40 is positioned close to the folding region 30a where the first belt 30 is folded back by the roller 31. The air blowing device 50 blows air into the folding region 30a. In this heat treatment apparatus 10, air is blown into the folding region 30a. This makes it easier for the sheet A to lift up in the folding region 30a. Because sheet A lifts up in the folding region 30a, the malfunction of sheet A following the first belt 30 beyond the folding region 30a is less likely to occur. As a result, poor transfer of sheet A from the first belt 30 to the second belt 40 is suppressed.

[0036] In the embodiment described above, a gap G is formed between the first belt 30 and the second belt 40. The air blowing device 50 is positioned below the roller 31. The air blowing device 50 blows air towards the gap G. This makes it easier for air to be blown from the gap G between the first belt 30 and the second belt 40, through which the sheet A is passed, toward the underside of the sheet A, making it easier for the sheet A to lift up. In addition, the air blown toward the gap G tends to flow along the direction of travel of the second belt 40 after lifting the leading edge A1 of the sheet A. Therefore, the sheet A is easily guided in the appropriate direction.

[0037] In the embodiment described above, a sensor 55 is provided between the outlet 22b of the heating furnace 20 and the position where the air blowing device 50 blows air. The sensor 55 detects the passage of sheet A. The air blowing device 50 may be configured to intermittently blow air onto the folded area 30a in response to the passage of sheet A detected by the sensor 55. Here, the air blowing device 50 and the sensor 55 are connected to the control device 56.

[0038] Sensor 55 detects that the leading edge A1 of sheet A has reached detection position 55a and transmits a signal to control device 56. Control device 56 receives the signal transmitted from sensor 55. Control device 56 controls the timing of air blowing by air blowing device 50 according to the timing when sheet A reaches detection position 55a and the conveying speed of sheet A. In this embodiment, control device 56 controls air blowing device 50 so that air blowing starts when sheet A reaches the fold-over region 30a. Control device 56 also controls air blowing device 50 so that air blowing ends after sheet A has been transferred from the first belt 30 to the second belt 40. By controlling the timing so that air is blown onto the fold-over region 30a when sheet A is transferred, the energy consumption of the device can be reduced.

[0039] It is not necessarily required that the air be blown intermittently. The air may be continuously blown while the heat treatment device 10 is operating and processing sheet A continuously.

[0040] In the embodiment described above, the heat treatment apparatus 10 further includes a static elimination device 60. The static elimination device 60 eliminates static electricity from the sheet A and the first belt 30 between the outlet 22b of the heating furnace 20 and the position where the air blowing device 50, described later, blows air. As a result, even if the sheet A is stuck to the first belt 30 due to static electricity, the static elimination makes it easier for the sheet A to peel off from the first belt 30. Consequently, poor sheet transfer between the first belt 30 and the second belt 40 can be reduced.

[0041] In the embodiment described above, the static eliminator 60 eliminates static electricity from sheet A and the first belt 30 in the folded region 30a upstream of the position where air is blown. Here, sheet A and the first belt 30 are eliminated at the boundary between the region where the first belt 30 is in contact with the roller 31 (folded region 30a) and the region where it is not in contact. Therefore, sheet A and the first belt 30 are eliminated just before sheet A is handed over from the first belt 30 to the second belt 40. As a result, because sheet A is handed over immediately after static elimination, it is easier to suppress the generation of static electricity again on sheet A and the first belt 30.

[0042] In the embodiment described above, the air blowing device 50 blows air onto the folded region 30a along the first belt 30 that is folded back by the roller 31. With this configuration, air is easily blown at a small angle to the interface between the leading edge A1 of the sheet A and the first belt 30. As a result, the leading edge A1 of the sheet A is more likely to lift up, and the transfer of the sheet A between the first belt 30 and the second belt 40 can be reduced. Note that the angle at which the air is blown by the air blowing device 50 is not limited to this configuration.

[0043] In the embodiment described above, the heat treatment apparatus 10 includes a static elimination device 60 and an air blowing device 50. The static elimination device 60 may be incorporated into the air blowing device 50. For example, the air blowing device 50 may be configured to blow ionized static elimination air 60a onto the folded region 30a, thereby eliminating static electricity from the leading edge A1 of the sheet A and causing it to lift up.

[0044] Figure 3 is a schematic diagram of a heat treatment apparatus 10A according to another embodiment. The heat treatment apparatus 10A is equipped with an air blowing device 50a. In the embodiment shown in Figure 3, an air blowing device 50a is used instead of an air blowing device 50. The configuration other than the air blowing device 50a is the same as that of the heat treatment apparatus 10, so redundant explanations are omitted.

[0045] <Air blowing device 50a> The air blowing device 50a blows air onto the folded region 30a. As shown in Figure 3, the air blowing device 50a has an opening 51a formed in the direction from which the air is blown. The air blowing device 50a blows air onto the folded region 30a from a direction intersecting the first belt 30 which is folded back by the roller 31. In this embodiment, the air blowing device 50a is positioned above the second belt 40. The air blowing device 50a is positioned in front of the roller 31. The opening 51a of the air blowing device 50a is located at the rear and directed toward the roller 31.

[0046] The air blowing device 50a blows air toward the first belt 30 which is folded back by the roller 31. The air hits the front end of the first belt 30 and is blown in the direction opposite to the direction in which the first belt 30 travels. The air hits the leading edge A1 of the sheet A being conveyed from above along the roller 31, causing the leading edge A1 of the sheet A to lift up. With its leading edge A1 lifted, the sheet A is passed over the gap G to the second belt 40. After the sheet A is passed over to the second belt 40, the air flows from rear to front along the upper surface A3 of the sheet A above the second belt 40. As a result, the sheet A, having moved onto the second belt 40, is pressed down from above and becomes more likely to follow the second belt 40.

[0047] Figure 4 is a schematic diagram of a heat treatment apparatus 10B according to another embodiment. The heat treatment apparatus 10B includes an air blowing device 50b and a roller 31b. The air blowing device 50b is located inside the roller 31b. In the embodiment shown in Figure 4, the air blowing device 50b is used instead of the air blowing device 50 and roller 31 (see Figure 2). Also, in the embodiment shown in Figure 4, the first belt 30 is a mesh belt. The configuration other than the air blowing device 50b and roller 31b is the same as that of the heat treatment apparatus 10, so redundant explanations are omitted.

[0048] <Laura 31b> As shown in Figure 4, the roller 31b has a cylindrical outer circumference 31b1. A cavity 31b2 is formed in the inner diameter direction of the outer circumference 31b1. The cavity 31b2 inside the outer circumference 31b1 is in communication with the outside of the outer circumference 31b1. The outer circumference 31b1 may have, for example, a mesh-like woven structure, although this is not particularly limited. The outer circumference 31b1 rotates in conjunction with the driving of the roller 31 (see Figure 2) and the first belt 30. An air blowing device 50b is provided in the cavity 31b2 inside the roller 31b. The air blowing device 50b may be fixed in the cavity 31b2 so as not to rotate in conjunction with the roller 31b. The air blowing device 50b may be fixed at both axial ends of the roller 31b.

[0049] <Air blowing device 50b> The air blowing device 50b blows air onto the folded region 30a. The air blowing device 50b has an opening 51b formed in the direction from which the air is blown. The air blowing device 50b blows air onto the folded region 30a from the inside to the outside of the roller 31b. The opening 51b of the air blowing device 50b faces forward and is directed toward the front end of the roller 31b. The position where the opening 51b is provided is not particularly limited, as long as it allows the leading edge A1 of the sheet A to be lifted when transferring from the first belt 30 to the second belt 40.

[0050] The air blowing device 50b blows air toward the first belt 30 which is folded back by the roller 31. The air passes through the roller 31b and the front end of the first belt 30 and is blown upward along the upper surface of the second belt 40. When the sheet A being conveyed on the first belt 30 reaches a position where it intersects with the air, the leading edge A1 of the sheet A is lifted by the air. With its leading edge A1 lifted, the sheet A is passed across the gap G to the second belt 40. Because the air is blown in the direction of conveyance on the second belt 40, the leading edge A1 of the sheet A is more easily guided from the first belt 30 to the second belt 40. This can stabilize the transfer of the sheet A.

[0051] Although a detailed explanation has been given above with specific embodiments, these are merely examples and do not limit the scope of the claims. Thus, the technology described in the claims includes various modifications and changes to the embodiments described above.

[0052] This specification includes the following sections 1 to 10. Sections 1 to 10 are not limited to the embodiments described above.

[0053] Section 1: A first belt that travels along a predetermined route and transports the sheet, A heating furnace covering a portion of the travel path of the first belt, A roller is provided downstream of the heating furnace in the aforementioned travel path, and the first belt is folded back. A second belt is positioned adjacent to the folding region where the first belt is folded back by the roller, An air blowing device that blows air onto the aforementioned folded region Equipped with, Heat treatment equipment.

[0054] Section 2: Furthermore, equipped with an anti-static device, The heat treatment apparatus according to item 1, wherein the static elimination device eliminates static electricity from the sheet and the first belt between the outlet of the heating furnace and the position where the air blowing device blows air.

[0055] Section 3: The heat treatment apparatus according to item 2, wherein the static elimination device eliminates static electricity from the sheet and the first belt in the folding region upstream of the position where the air is blown.

[0056] Section 4: The static elimination device is a heat treatment apparatus according to item 2 or 3, which blows static elimination air onto the outer surface of the first belt.

[0057] Section 5: A gap is formed between the first belt and the second belt. The air blowing device is positioned below the roller and blows air toward the gap, as described in any one of items 1 to 4.

[0058] Item 6: The heat treatment apparatus according to any one of claims 1 to 4, wherein the air blowing device blows air onto the folded region along the first belt which is folded back on the roller.

[0059] Section 7: The heat treatment apparatus according to any one of claims 1 to 4, wherein the air blowing device blows air onto the folded region from a direction intersecting the first belt which is folded back by the roller.

[0060] Section 8: The heat treatment apparatus according to any one of claims 1 to 4, wherein the air blowing device is provided inside the roller and blows air from the inside to the outside of the roller into the folded region.

[0061] Section 9: A sensor for detecting the passage of the sheet is provided between the outlet of the heating furnace and the position from which the air blowing device blows air. The air blowing device intermittently blows air onto the folded area in accordance with the passage of the sheet detected by the sensor, as described in any one of claims 1 to 8.

[0062] Section 10: The heat treatment apparatus according to any one of claims 1 to 9, wherein the second belt is positioned below the axis of rotation of the roller. [Explanation of symbols]

[0063] A Sheet A1 Tip A2 bottom side A3 top G Gap 10, 10A, 10B Heat treatment apparatus 20 Furnace 20a Processing space 22 Furnace body 22a entrance 22b exit 24 Heater 30 Belt 1 30a Folded area 31-34, 31b, 41, 42 Laura 31b1 Outer periphery 31b2 hollow 35 Drive unit 40. Belt 2 50, 50a, 50b Air blowing device 51,51a,51b opening 55 Sensors 55a Detection location 56 Control device 60 Static eliminator

Claims

1. A first belt that travels along a predetermined route and transports the sheet, A heating furnace covering a portion of the travel path of the first belt, A roller is provided downstream of the heating furnace in the aforementioned travel path, and the first belt is folded back. A second belt is positioned below the axis of rotation of the roller and close to the folding region where the first belt is folded back by the roller, An air blowing device that blows air onto the aforementioned folded region Equipped with, A gap is formed between the first belt and the second belt. The air blowing device is positioned below the roller and blows air toward the gap. Heat treatment equipment.

2. A first belt that travels along a predetermined route and transports the sheet, A heating furnace covering a portion of the travel path of the first belt, A roller is provided downstream of the heating furnace in the aforementioned travel path, and the first belt is folded back. A second belt is positioned below the axis of rotation of the roller and close to the folding region where the first belt is folded back by the roller, An air blowing device positioned above the second belt and in front of the roller, which blows air onto the folded area, Equipped with, The air blowing device blows air onto the folded region from a direction intersecting the first belt that is folded back by the roller. Heat treatment equipment.

3. Furthermore, equipped with an anti-static device, The heat treatment apparatus according to claim 1 or 2, wherein the static elimination device eliminates static electricity from the sheet and the first belt between the outlet of the heating furnace and the position where the air blowing device blows air.

4. The heat treatment apparatus according to claim 3, wherein the static elimination device eliminates static electricity from the sheet and the first belt in the folding region upstream of the position where the air is blown.

5. The heat treatment apparatus according to claim 4, wherein the static elimination device blows static elimination air onto the outer surface of the first belt.

6. The heat treatment apparatus according to claim 1 or 2, wherein the air blowing device blows air onto the folded region along the first belt which is folded back by the roller.

7. A sensor for detecting the passage of the sheet is provided between the outlet of the heating furnace and the position from which the air blowing device blows air. The heat treatment apparatus according to claim 1 or 2, wherein the air blowing device intermittently blows air onto the folded area in accordance with the passage of the sheet detected by the sensor.

Images