Heat treatment apparatus

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] The present disclosure relates to a thermal processing apparatus. [Background technology]

[0002] Japanese Patent Application Laid-Open Publication No. 2006-077272 discloses a manufacturing apparatus for a porous sintered metal body, which includes a heating furnace, a furnace gas outlet path, a combustion chamber, a regeneration gas introduction path, and a gas analyzer. The manufacturing apparatus disclosed in this publication is provided with a mesh belt that moves a green sheet from the inlet to the outlet of the heating furnace. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-077272 Summary of the Invention [Problem to be solved by the invention]

[0004] The sheet that has been heat-treated while being conveyed on the belt may be transferred to another belt after heating. [Means for solving the problem]

[0005] The heat treatment device disclosed herein includes a first belt, a heating furnace, a roller, a second belt, and an air blowing device. The first belt travels along a predetermined travel path to transport a sheet. The heating furnace covers a portion of the travel path of the first belt. The roller is provided downstream of the heating furnace on the travel path. The roller turns back the first belt. The second belt is disposed adjacent to a turn-back region where the first belt is turned back by the roller. The air blowing device blows air onto the turn-back region. In such heat treatment, the sheet is stably transferred between the belts. [Brief explanation of the drawings]

[0006] [Figure 1] FIG. 1 is a schematic diagram showing a heat treatment apparatus 10. As shown in FIG. [Figure 2] FIG. 2 is a schematic diagram showing the heat treatment apparatus 10. As shown in FIG. [Figure 3] FIG. 3 is a schematic diagram of a heat treatment apparatus 10A according to another embodiment. [Figure 4] FIG. 4 is a schematic diagram of a heat treatment apparatus 10B according to another embodiment. DETAILED DESCRIPTION OF THE INVENTION

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

[0008] 1 and 2 are schematic diagrams showing a heat treatment apparatus 10. In FIGS. 1 and 2, the direction in which sheet A is transported is indicated by an arrow. In FIG. 2, a schematic diagram showing how sheet A is transferred from first belt 30 to second belt 40 is shown. In FIG. 2, the direction in which air is blown from air blowing device 50 is indicated by a hollow arrow.

[0009] <Heat treatment device 10> As shown in Fig. 1, the heat treatment apparatus 10 includes 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 further includes a static elimination device 60. The heat treatment apparatus 10 is an apparatus for heat-treating a sheet-like object to be treated (hereinafter simply referred to as a "sheet") while transporting it. In the heat treatment apparatus 10, a plurality of sheets A are transported in sequence and continuously processed.

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

[0011] <1st Belt 30> The first belt 30 travels along a predetermined travel path to transport the sheet A. In this embodiment, the first belt 30 is a mesh belt made of glass fiber coated with a fluororesin. The first belt 30 is coated with a fluororesin, which 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 pattern. The first belt 30 is a mesh belt, which 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 depending on the composition of the sheet A and the processing conditions, 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 a circular belt with no ends, a so-called endless belt. The sheet A is conveyed while being placed on the outer surface of the first belt 30. The first belt 30 is wound around rollers 31 to 34 with a required tension applied. The rollers 31 to 34 are made of metal, for example, stainless steel. By making the rollers 31 to 34 out of metal, static electricity that may be generated on the first belt 30 can be reduced.

[0013] The first belt 30 may be looped around a tension roller (not shown) for adjusting the tension. A drive device 35 for driving the first belt 30 is connected to the roller 34. The drive device 35 rotates the roller 34 to drive the first belt 30 counterclockwise. For example, a servo motor may be used as the drive device 35. The conveying speed of the first belt 30 may be adjusted by controlling the rotation speed of the servo motor serving as the drive device 35.

[0014] A driving device 35 drives and rotates the roller 34. As the roller 34 rotates, the first belt 30 is driven in a predetermined direction. The rollers 31 to 33 around which the first belt 30 is wound are rotated by the first belt 30. The travel path of the first belt 30 is determined by the rollers 31 to 34.

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

[0016] <Heating furnace 20> The heating furnace 20 is equipment that heat-treats the sheet A. The heating furnace 20 covers a portion of the travel path of the first belt 30. The heating furnace 20 covers the periphery of 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 treatment space 20a is formed in which the sheet A is treated while being transported from an entrance 22a to an exit 22b. The first belt 30 passes through the heating furnace 20, and the sheet A is continuously heated while being transported.

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

[0018] The furnace body 22 is made of a heat insulating material around the entire circumference in the conveying direction. The furnace body 22 can be made, for example, by stacking ceramic fiber boards formed into a predetermined shape. The ceramic fiber board is, for example, a plate material formed by adding inorganic filler and inorganic / organic binder to so-called bulk fiber. The thickness of the furnace wall is set to a required thickness that sufficiently insulates the heat of the processing space 20a.

[0019] The heat treatment apparatus 10 may be provided with various equipment upstream and downstream of the heating furnace 20. For example, a preheating device that preheats the sheet A before the sheet A is heat-treated in the heating furnace 20 may be provided upstream of the heating furnace 20. A heat equalizing device that equalizes the temperature of the sheet A heat-treated in the heating furnace 20, a cooling device that cools the sheet A heat-treated in the heating furnace 20, and the like may be provided downstream of the heating furnace 20.

[0020] The heat treatment may increase the adhesion of the sheet A to the first belt 30. This may make the sheet A more likely to stick to the first belt 30. Furthermore, after the heat treatment, the sheet A may be more likely to stick to the first belt 30 due to static electricity.

[0021] After passing through the heating furnace 20, the first belt 30 is folded back downstream of the heating furnace 20 on the travel path. A sensor 55 for detecting the passage of the sheet A may be provided downstream of the heating furnace 20. The sensor 55 is provided between the outlet 22b of the heating furnace 20 and a position where an air blowing device 50 (described later) blows air. The sensor 55 detects that the leading edge A1 of the sheet A has reached a predetermined detection position 55a (see FIG. 2) just before the folding back region 30a.

[0022] <Lola 31> The roller 31 is a roller that turns back the first belt 30. The roller 31 is provided downstream of the heating furnace 20 in the travel path. The first belt 30 turns back from the roller 31 toward the roller 32. In this embodiment, the first belt 30 is turned back downward and backward by the roller 31. In this embodiment, a static eliminator 60 is provided above the roller 31.

[0023] <Static eliminator 60> The static eliminator 60 is a device that eliminates static electricity from the sheet A and the first belt 30. The static eliminator 60 is provided between the outlet 22b of the heating furnace 20 and a position where an air blowing device 50 (described later) blows air. The static eliminator 60 is provided at a position facing the outer surface of the first belt 30. In this example, the static eliminator 60 is provided above the roller 31.

[0024] The static eliminator 60 neutralizes the sheet A and the first belt 30 above the roller 31. The static eliminator 60 neutralizes the sheet A and the first belt 30 upstream of the folded-back region 30a where the sheet A and the first belt 30 are folded back by the roller 31. The sheet A and the first belt 30 are neutralized at the boundary between the region where the first belt 30 contacts the roller 31 (the folded-back region 30a) and the region where the first belt 30 does not contact the roller 31.

[0025] In this embodiment, the static eliminator 60 is a device that blows ionized static eliminator air 60a (see FIG. 2) onto the outer surface of the first belt 30. The static eliminator air 60a is blown from the static eliminator 60 disposed above the roller 31 onto the first belt 30 passing over the roller 31. By eliminating static electricity from the sheet A in a non-contact manner, the quality of the sheet A is likely to be maintained at a good level. Note that the static eliminator 60 is not particularly limited as long as it can eliminate static electricity from the first belt 30. For example, a DC static eliminator, an AC static eliminator, a pulse static eliminator, a static eliminator brush, a static eliminator cord, etc. may be used as the static eliminator 60. Note that the static eliminator 60 is not essential for the heat treatment apparatus 10.

[0026] 2, after the sheet A is neutralized, it is transferred from the first belt 30 to the second belt 40 in a turn-back region 30a where the first belt 30 is turned back by the roller 31. Here, the turn-back region 30a is a region of the first belt 30 that comes into contact with the roller 31.

[0027] <Second Belt 40> The second belt 40 is disposed adjacent to a turn-back region 30a where the first belt 30 is turned back by the roller 31. The second belt 40 is a circular belt without an end portion, similar to the first belt 30. After being handed over from the first belt 30, the sheet A is conveyed while being placed on the outer surface of the second belt 40. The configuration of the second belt 40 may be the same as or different from the configuration of the first belt 30. The second belt 40 may be a belt having lower heat resistance than 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 similar to that of the drive device 35 (see FIG. 1), so a detailed description will be omitted. The travel path of the second belt 40 is set by rollers 41 and 42 (see FIG. 1). The sheet A is transported substantially horizontally from roller 41 to roller 42. The upper ends of rollers 41 and 42 are set at substantially the same height. A support roller that supports the second belt 40 from below may be provided between roller 41 and roller 42.

[0029] The roller 41 is positioned so that its upper end is lower than the upper end of the roller 31. In this embodiment, the second belt 40 is positioned below the axial center of the rotation shaft of the roller 31. The upper end of the roller 41 is positioned lower than the front end of the roller 31. This makes it easier for the sheet A to be transferred from the first belt 30 to the second belt 40. The heated sheet A transported on the second belt 40 can be collected by a collection device (not shown).

[0030] A gap G is formed between the folded-back region 30a of the first belt 30 and the second belt 40. The size of the gap G can be determined by the distance between the roller 31 and the roller 41 and the thickness of the first belt 30 and the second belt 40. Although not particularly limited, the size of the gap G is set to be larger than the thickness of the 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] The sheet A is transferred 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 device 10, when the sheet A is transferred from the first belt 30 to the second belt 40, air is blown onto the folded-back region 30a.

[0032] <Air spraying device 50> The air blowing device 50 blows air onto the folding region 30a. The air blowing device 50 has an opening 51 formed in the direction in which the air is blown. The opening 51 can be a long hole along the width direction of the sheet A (a direction perpendicular to the direction in which the sheet A is conveyed). The air blowing device 50 blows air onto the folding region 30a when the sheet A is handed over, so as to lift the sheet A from the first belt 30. The air blowing device 50 blows air onto the underside 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 sends compressed air. The air blowing device 50 is not limited to this form.

[0033] In this embodiment, the air blowing device 50 is disposed below the roller 31. The air blowing device 50 is disposed below the roller 41. An opening 51 of the air blowing device 50 is provided upward and faces the gap G. The air blowing device 50 blows air toward the gap G. The air is blown in the direction opposite to the running direction of the first belt 30. The air is blown in the direction along the running direction of the second belt 40. The air passes through the gap G and is blown toward the folded-back region 30a along the first belt 30 that is folded back around the roller 31.

[0034] However, the sheet processed in the heating furnace may stick to the first belt. In this case, the sheet may follow the first belt while still stuck to it, resulting in a transfer failure where the sheet is not transferred to the second belt. This failure is particularly likely to occur when the sheet is thin or soft after heat treatment.

[0035] In the above-described embodiment, the heat treatment apparatus 10 includes 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 travel 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 provided downstream of the heating furnace 20 on the travel path. The roller 31 turns back the first belt 30. The second belt 40 is disposed adjacent to a turn-back region 30a where the first belt 30 is turned back by the roller 31. The air blowing device 50 blows air onto the turn-back region 30a. In the heat treatment apparatus 10, air is blown onto the turn-back region 30a. This makes it easier for the sheet A to lift up in the turn-back region 30a. By lifting the sheet A in the folding region 30a, the sheet A is less likely to follow the first belt 30 after the folding region 30a. As a result, poor delivery of the sheet A from the first belt 30 to the second belt 40 is suppressed.

[0036] In the above-described embodiment, a gap G is formed between the first belt 30 and the second belt 40. The air blowing device 50 is disposed below the roller 31. The air blowing device 50 blows air toward the gap G. As a result, air is easily blown toward the underside of the sheet A from the gap G between the first belt 30 and the second belt 40 through which the sheet A is handed over, making it easy for the sheet A to lift up. Furthermore, the air blown toward the gap G easily flows along the running direction of the second belt 40 after lifting the leading edge A1 of the sheet A. This makes it easy for the sheet A to be 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 the sheet A. The air blowing device 50 may be configured to intermittently blow air onto the folding region 30a in response to the passage of the sheet A detected by the sensor 55. Here, the air blowing device 50 and the sensor 55 are connected to a control device 56.

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

[0039] It is not necessary to blow air intermittently, but air may be blown continuously while the heat treatment apparatus 10 is operating and the sheets A are being processed continuously.

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

[0041] In the above-described embodiment, the static eliminator 60 neutralizes the sheet A and the first belt 30 in the turn-back region 30a located upstream of the position where the air is blown. Here, the sheet A and the first belt 30 are neutralized at the boundary between the region where the first belt 30 contacts the roller 31 (the turn-back region 30a) and the region where the first belt 30 does not contact the roller 31. Therefore, the sheet A and the first belt 30 are neutralized immediately before the sheet A is handed over from the first belt 30 to the second belt 40. As a result, the sheet A is handed over immediately after the neutralization, which makes it easy to prevent static electricity from being generated again in the sheet A and the first belt 30.

[0042] In the above-described embodiment, the air blowing device 50 blows air onto the folded-back region 30a along the first belt 30 folded back around the roller 31. With this configuration, air is likely to be blown at a small angle to the interface between the leading edge A1 of the sheet A and the first belt 30. This makes it easier for the leading edge A1 of the sheet A to lift up, which can reduce poor delivery of the sheet A between the first belt 30 and the second belt 40. Note that the angle at which air is blown by the air blowing device 50 is not limited to this.

[0043] In the above-described embodiment, the heat treatment apparatus 10 includes the static eliminator 60 and the air blowing device 50. The static eliminator 60 may be incorporated into the air blowing device 50. For example, the air blowing device 50 may be configured to blow ionized static eliminator air 60a onto the folded-back region 30a, thereby lifting the leading edge A1 of the sheet A while eliminating static electricity therefrom.

[0044] Fig. 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 Fig. 3, an air blowing device 50a is used instead of the 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 will be omitted.

[0045] <Air blowing device 50a> The air blowing device 50a blows air onto the folded-back region 30a. As shown in FIG. 3, the air blowing device 50a has an opening 51a formed in the direction in which the air is blown. The air blowing device 50a blows air onto the folded-back region 30a from a direction intersecting the first belt 30 folded back around the roller 31. In this embodiment, the air blowing device 50a is disposed above the second belt 40. The air blowing device 50a is disposed in front of the roller 31. The opening 51a of the air blowing device 50a is provided at the rear and faces 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 opposite direction to the traveling direction of the first belt 30. The air hits the leading edge A1 of the sheet A, which is conveyed from above along the roller 31, and lifts the leading edge A1 of the sheet A. The sheet A, whose leading edge A1 has been lifted, is passed to the second belt 40 across the gap G. After the sheet A is passed to the second belt 40, the air flows from the rear to the front above the second belt 40 along the upper surface A3 of the sheet A. As a result, the sheet A transferred to the second belt 40 is pressed down from above, making it easier to follow the second belt 40.

[0047] FIG. 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 provided inside the roller 31b. In the embodiment shown in FIG. 4, the air blowing device 50b is used instead of the air blowing device 50 and the roller 31 (see FIG. 2). In addition, in the embodiment shown in FIG. 4, the first belt 30 is a mesh belt. The configuration other than the air blowing device 50b and the roller 31b is the same as that of the heat treatment apparatus 10, so a duplicated description will be omitted.

[0048] <Lola 31b> As shown in FIG. 4, roller 31b has a cylindrical outer peripheral portion 31b1. A cavity 31b2 is formed in the radially inner direction of outer peripheral portion 31b1. Cavity 31b2 inside outer peripheral portion 31b1 is connected to the outside of outer peripheral portion 31b1. Although not particularly limited, outer peripheral portion 31b1 may have, for example, a mesh-like woven structure. Outer peripheral portion 31b1 rotates as first belt 30 of roller 31 (see FIG. 2) is driven. An air blowing device 50b is provided in cavity 31b2 inside roller 31b. Air blowing device 50b may be fixed in cavity 31b2 so as not to rotate in conjunction with roller 31b. Air blowing device 50b may be fixed at both axial ends of roller 31b.

[0049] <Air blowing device 50b> The air blowing device 50b blows air onto the folding region 30a. An opening 51b is formed in the air blowing device 50b in the direction in which the air is blown. The air blowing device 50b blows air onto the folding region 30a from the inside to the outside of the roller 31b. The opening 51b of the air blowing device 50b faces forward, toward the front end of the roller 31b. The position of the opening 51b is not particularly limited as long as it can lift the leading edge A1 of the sheet A when it is transferred from the first belt 30 to the second belt 40.

[0050] The air blowing device 50b blows air toward the first belt 30 that 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. The sheet A with its leading edge A1 lifted is then handed over to the second belt 40 across the gap G. Because the air is blown in the direction in which the sheet A is conveyed on the second belt 40, the leading edge A1 of the sheet A is easily guided from the first belt 30 to the second belt 40. This can stabilize the handover of the sheet A.

[0051] Although the present invention has been described in detail above using 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 alterations of the above-described embodiments.

[0052] This specification includes the following items 1 to 10. The following items 1 to 10 are not limited to the above-described embodiment.

[0053] Section 1: a first belt that travels along a predetermined travel path to transport a sheet; a heating furnace covering a part of the running path of the first belt; a roller that is provided downstream of the heating furnace in the travel path and turns back the first belt; a second belt disposed adjacent to a folding region where the first belt is folded by the roller; an air blowing device that blows air onto the folded-back region; Equipped with Heat treatment equipment.

[0054] Section 2: Further provided with a static eliminator, Item 2. The heat treatment device according to item 1, wherein the static eliminator eliminates static electricity from the sheet and the first belt between an outlet of the heating furnace and a position where the air blowing device blows air.

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

[0056] Section 4: Item 4. The heat treatment device according to item 2 or 3, wherein the static eliminator blows static eliminator air onto the outer surface of the first belt.

[0057] Section 5: A gap is formed between the first belt and the second belt, 5. The heat treatment device according to any one of items 1 to 4, wherein the air blowing device is disposed below the roller and blows air toward the gap.

[0058] Item 6: 5. The heat treatment device according to any one of items 1 to 4, wherein the air blowing device blows air onto the folded region along the first belt folded back around the roller.

[0059] Section 7: 5. The heat treatment device according to any one of items 1 to 4, wherein the air blowing device blows air onto the folded region from a direction intersecting the first belt folded back around the roller.

[0060] Section 8: 5. The heat treatment device according to any one of items 1 to 4, wherein the air blowing device is provided inside the roller and blows air onto the folded region from the inside to the outside of the roller.

[0061] Section 9: a sensor for detecting the passage of the sheet is provided between an outlet of the heating furnace and a position where the air blowing device blows air; Item 9. The heat treatment device according to any one of items 1 to 8, wherein the air blowing device intermittently blows air onto the folded region in response to the passage of the sheet detected by the sensor.

[0062] Section 10: 10. The heat treatment device according to any one of items 1 to 9, wherein the second belt is disposed below the center of the rotation shaft of the roller. [Explanation of symbols]

[0063] A Seat A1 Tip A2 bottom side A3 top G Gap 10, 10A, 10B Heat treatment device 20 Furnace 20a Processing space 22 Furnace body 22a entrance 22b exit 24 Heater 30 First Belt 30a Folding area 31~34, 31b, 41, 42 Laura 31b1 Outer periphery 31b2 hollow 35 Drive unit 40 Second Belt 50, 50a, 50b Air spraying device 51,51a,51b opening 55 Sensors 55a Detection position 56 Control device 60 Static eliminator

Claims

1. a first belt that travels along a predetermined travel path to transport a sheet; a heating furnace covering a part of the travel path of the first belt; a roller provided downstream of the heating furnace in the travel path and configured to turn back the first belt; a second belt disposed adjacent to a folding region where the first belt is folded by the roller; an air blowing device that blows air onto the folded-back region; Equipped with Heat treatment equipment.

2. Further provided with a static eliminator, The heat treatment apparatus according to claim 1 , wherein the static eliminator eliminates static electricity from the sheet and the first belt between an outlet of the heating furnace and a position where the air blowing device blows air.

3. The heat treatment apparatus according to claim 2 , wherein the static eliminator eliminates static electricity from the sheet and the first belt in the turn-back region upstream of the position where the air is blown.

4. The heat treatment apparatus according to claim 2 or 3, wherein the static eliminator blows static eliminator air onto the outer surface of the first belt.

5. A gap is formed between the first belt and the second belt, 4. The heat treatment apparatus according to claim 1, wherein the air blowing device is disposed below the roller and blows air toward the gap.

6. 4. The heat treatment device according to claim 1, wherein the air blowing device blows air onto the folded region along the first belt folded back around the roller.

7. 4. The heat treatment apparatus according to claim 1, wherein the air blowing device blows air onto the folded region from a direction intersecting the first belt folded back around the roller.

8. 4. The heat treatment apparatus according to claim 1, wherein the air blowing device is provided inside the roller and blows air from the inside to the outside of the roller onto the folded region.

9. a sensor for detecting the passage of the sheet is provided between an outlet of the heating furnace and a position where the air blowing device blows air; 4. The heat treatment apparatus according to claim 1, wherein the air blowing device intermittently blows air onto the folded region in response to the passage of the sheet detected by the sensor.

10. 4. The heat treatment device according to claim 1, wherein the second belt is disposed below the center of the rotation shaft of the roller.

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