JP2023016627A - Continuous burning apparatus - Google Patents

Abstract

To provide a continuous burning apparatus capable of producing burned products with high quality while suppressing the consumption of energy.SOLUTION: A continuous burning apparatus 1 includes a conveyor 2 and a heating section 40. The conveyor 2 has an endless belt 21 and a motor 25. The motor 25 rotates the belt 21 so that a burning substance 91 placed in a belt conveyance area 21C positioned at an upper side in the belt 21 moves in a conveyance direction X. The heating section 40 is constituted of an upper side heating part 40U and a lower side heating part 40L. The upper side heating part 40U is arranged above the belt conveyance area 21C. The lower side heating part 40L is arranged below the belt 21 and at an inner peripheral side of the belt 21. The upper side heating part 40U and the lower side heating part 40L each have a flat heating plate 50 disposed facing the belt conveyance area 21C, and a sheathed heater 60 disposed on a heater surface 52 of the heating plate 50.SELECTED DRAWING: Figure 3

Description

TECHNICAL FIELD The present invention relates to a continuous baking apparatus that continuously bakes an object to be baked by heating the object to be baked while conveying the object in the conveying direction.

2. Description of the Related Art Conventionally, for example, in the production of baked confectionery, the dough is baked by passing the dough through a high-temperature furnace. For example, Patent Literature 1 describes a baking apparatus capable of obtaining a large amount of pottery by conveying an object to be heated by a conveyor into a housing heated to a high temperature by burning gas.

JP-A-6-327566

By the way, the baking apparatus described in Patent Document 1 is of a type in which the inside of the housing is heated by combustion of gas. In such a conventional baking apparatus, it is necessary to suppress the extreme unevenness of the temperature in the space inside the housing in order to suppress variations in the baked color of the object to be baked. For this reason, for example, it is necessary to secure a certain distance between the heat source and the object to be fired, which tends to increase the space inside the housing. In addition, since it is necessary to secure a large space in the housing and heat the entire large space, there is a problem that the amount of energy consumed increases.

SUMMARY OF THE INVENTION An object of the present invention is to provide a continuous baking apparatus capable of manufacturing high-quality baked products while suppressing energy consumption.

A continuous baking apparatus according to the present invention for solving the above problems is a continuous baking apparatus that continuously bakes an object to be baked by heating while conveying the object to be baked in a conveying direction. and a conveyor having a drive unit that rotates the belt in a direction in which the object to be baked placed in the belt conveying area, which is an upper area of the belt, moves in the conveying direction, and above the belt conveying area and a heating unit having a lower heating unit arranged below the belt conveying area and on the inner peripheral side of the belt, wherein the upper heating unit and the lower heating unit are respectively 1. A continuous baking apparatus comprising: a flat heating plate provided facing a belt conveying area; and a heater provided on the back surface of the heating plate opposite to the belt conveying area. be.

In this continuous baking apparatus, the heat generated by the heater can be evened out by the flat heating plate. That is, it is possible to suppress the occurrence of an extreme temperature difference in the heating plate. Therefore, the upper heating section and the lower heating section can be brought closer to the object to be heated. That is, the upper heating section can be arranged immediately above the object to be fired. As for the lower heating section, it can be arranged on the inner peripheral side of the belt just below the belt transport area. Thereby, the heating space formed between the heating plate of the upper heating section and the heating plate of the lower heating section can be narrowed. Therefore, the heating efficiency of the object to be fired can be enhanced. Furthermore, since the heat generated by the heater is evened out by the heating plate, it is possible to suppress the occurrence of a difference in the degree of progress of baking of the object to be baked. Therefore, it is possible to manufacture high-quality baked products while suppressing energy consumption.

Further, in the above-described continuous firing apparatus, the belt is preferably made of sheet metal. In this continuous baking apparatus, by using a sheet metal as a belt, it is possible to suppress heat from escaping to the outside from the space between the upper heating unit and the belt. Thereby, the heating efficiency of the object to be fired can be further enhanced.

Further, in the continuous baking apparatus described above, the heater is a linear heating element, and includes a plurality of width direction portions extending in the width direction of the belt, and a connection for connecting the ends of the two width direction portions. The plurality of width direction parts are arranged side by side in the conveying direction, and the connection part is positioned outside the belt conveying area in the width direction from the area where the object to be baked is placed. preferably. In this continuous baking apparatus, the object to be baked can be uniformly heated in the width direction of the belt by the upper heating section and the lower heating section. Therefore, high-quality baked products can be stably produced.

Further, in the continuous baking apparatus described above, it is preferable that the heating section includes a plurality of heating regions in which the object to be baked is heated at different temperatures in the conveying direction. In this continuous baking apparatus, the heating temperature of the object to be baked can be changed appropriately at each time from the start to the end of baking. That is, for example, in the early stage of baking, the amount of moisture removed from the object to be baked is increased by heating at a high temperature, and in the latter stage of baking, the object to be baked is heated at a lower temperature than in the initial stage to prevent the object from burning. It is possible to finely adjust the moisture content of the object to be fired while suppressing the Therefore, a baked product with high quality can be manufactured.

Further, in the continuous baking apparatus described above, the same temperature heating plate group including a plurality of heating plates provided in the conveying direction is provided in the heating area having the same heating temperature, and the same temperature heating plate group is adjacent to each other. It is preferable that the two heating plates are in contact with each other at their ends at least when heating the object to be baked. For example, if there is a position in the conveying direction where the actual heating temperature is lower than the target temperature, the firing of the object to be fired does not proceed at that position, and the total length of the firing furnace needs to be lengthened. However, the larger the firing furnace, the more energy required for firing. On the other hand, in this continuous baking apparatus, the upper heating part and the lower heating part in the heating area with the same heating temperature suppress the decrease in the heating temperature even at the boundary when there are a plurality of heating plates. can. As a result, high-quality baked products can be produced while suppressing energy consumption.

Further, in the continuous baking apparatus described above, a heating plate provided in one heating area of two adjacent heating areas and positioned at the end of the other heating area which is the other heating area , and the heating plate provided in the other heating area and positioned at the end of the one heating area, are in a non-contact state with a gap provided between them at least when the object to be baked is heated. preferable. In this continuous baking apparatus, it is possible to prevent the temperature of the heating plate from changing due to the heating temperature of other heating regions. Therefore, the object to be baked can be heated at an accurate heating temperature predetermined for each heating area. Therefore, an object to be fired with high quality can be manufactured.

Further, in the continuous baking apparatus described above, a heating plate provided in one heating area of two adjacent heating areas and positioned at the end of the other heating area which is the other heating area It is preferable that a heat insulating material having a lower thermal conductivity than that of the heating plate is provided between the heating plate provided in the other heating region and positioned at the end on the one heating region side. In this continuous baking apparatus, it is possible to prevent the temperature of the heating plate from changing due to the heating temperature of other heating regions. Therefore, the object to be baked can be heated at an accurate heating temperature predetermined for each heating area. Therefore, a baked product with high quality can be manufactured.

ADVANTAGE OF THE INVENTION According to this invention, the continuous baking apparatus which can manufacture a baked product with high quality while suppressing consumption of energy is provided.

1 is an overall schematic diagram of a continuous firing apparatus according to an embodiment; FIG. FIG. 2 is a cross-sectional view of the continuous baking apparatus shown in FIG. 1 taken along the line AA. FIG. 4 is a diagram showing the configuration of an upper heating section and a lower heating section in the same heating area according to the first embodiment; FIG. 4 is a plan view showing the configuration within the same heating area of the upper heating section according to the first embodiment; FIG. 4 is a diagram showing a configuration at a boundary between different heating regions of an upper heating section and a lower heating section according to the first embodiment; FIG. 10 is a plan view showing the configuration within the same heating area of the upper heating unit according to the second embodiment; FIG. 10 is a diagram showing a configuration at a boundary between different heating regions of an upper heating section and a lower heating section according to the second embodiment;

A continuous firing apparatus, which is an embodiment of the present invention, will be described in detail with reference to the drawings. First, the first embodiment, which is one of the embodiments, will be described. After that, other forms will be described with respect to portions different from the first embodiment.

<First embodiment>
FIG. 1 is a schematic diagram showing the entirety of a continuous firing apparatus 1 according to this embodiment. As shown in FIG. 1 , the continuous firing device 1 includes a conveyor 2 and a firing furnace 3 . The continuous baking apparatus 1 heats the object 91 to be baked while conveying it in the conveying direction X indicated by the arrow in FIG. The object to be baked 91 is a solid object containing water. The object to be baked 91 is heated by the continuous baking device 1 to remove moisture, and becomes a baked product 92 . The continuous baking apparatus 1 can continuously produce baked products 92 by continuously baking the object 91 to be baked.

Baked products 92 are, for example, small baked goods. Specific examples of the baked products 92 of the present embodiment include Western confectionery such as biscuits and cookies that contain wheat as a main raw material and contain fats and oils. The object to be baked 91 to be baked by the continuous baking apparatus 1 in the present embodiment is a dough mixed with raw materials for the baked product 92 and formed into a predetermined size.

The conveyor 2 has a belt 21 , a drive roller 22 and a driven roller 23 . The belt 21 is an endless conveyor belt formed by annularly connecting metal sheets. Specifically, the belt 21 of this embodiment is made of sheet-like stainless steel. By using the stainless steel sheet as the belt 21 , it is possible to prevent solids and liquids that have fallen from the object to be baked 91 from dropping from the belt 21 and to easily remove them. For example, it is possible to suppress dripping of oil coming out of the object to be baked 91 during baking to the lower side of the belt 21 . In addition, the stainless steel belt 21 can easily remove oil adhering to the surface of the belt 21 . Therefore, the continuous baking apparatus 1 can be maintained in a clean state.

The belt 21 is wound around the outer peripheral surfaces of the driving roller 22 and the driven roller 23 . As a result, both ends of the belt 21 in the horizontal direction in FIG. 1 are supported by the driving roller 22 and the driven roller 23, respectively. An upper region of the belt 21 positioned between the driving roller 22 and the driven roller 23 is defined as a belt conveying region 21C. Further, the outer peripheral surface of the belt conveying area 21C is referred to as an upper surface 21A, and the inner peripheral surface of the belt conveying area 21C is referred to as a lower surface 21B.

The drive roller 22 is connected to a motor 25 as a drive source. When the motor 25 is driven, the drive roller 22 rotates in the direction indicated by the arrow in FIG. The driving force of the driving roller 22 is transmitted to the driven roller 23 via the belt 21 . The driven roller 23 is driven to rotate by a driving force transmitted through the belt 21 . As the drive roller 22 rotates in this way, the belt 21 also rotates.

The belt conveying area 21C moves in the conveying direction X when the belt 21 rotates. The object to be baked 91 is supplied to a supply position 91A positioned on the upper surface 21A of the belt conveying area 21C. The supply position 91A is a position on the upstream side of the baking furnace 3 with respect to the transport direction X on the upper surface 21A of the belt transport area 21C. The object to be fired 91 supplied to the supply position 91A is then moved in the transport direction X by the movement of the belt transport area 21C while being placed on the belt transport area 21C. That is, the object 91 to be fired passes through the firing furnace 3 by rotating the belt 21 . The object to be fired 91 is fired by passing through the firing furnace 3 to become a fired product 92 . The fired product 92 after passing through the firing furnace 3 is taken out from the continuous firing device 1 at a take-out position 92A located on the upper surface 21A of the belt conveying area 21C. The take-out position 92A is a position downstream of the firing furnace 3 with respect to the transport direction X on the upper surface 21A of the belt transport area 21C.

The firing furnace 3 has a firing space 35 partitioned from the outside by a plurality of outer walls 31 . An outer wall 31 forming an end portion of the firing furnace 3 on the upstream side in the transport direction X is formed with an entrance 32 at a position corresponding to the belt transport area 21C. An outer wall 31 forming an end portion of the firing furnace 3 on the downstream side in the conveying direction X is provided with an outlet 33 at a position corresponding to the belt conveying area 21C. The entrance 32 is a through hole for passing the belt 21 of the conveyor 2 and the object 91 to be fired from the outside of the firing space 35 into the firing space 35 . The exit 33 is a through hole for passing the belt 21 of the conveyor 2 and the baked product 92 from inside the baking space 35 to the outside.

A plurality of partition walls 37 are provided inside the firing space 35 . A plurality of partition walls 37 are arranged side by side in the transport direction X and divide the firing space 35 in the transport direction X. As shown in FIG. In the firing furnace 3 according to this embodiment, the firing space 35 is divided into seven heating regions 36 by six partition walls 37 . In FIG. 1, the plurality of heating regions 36 are shown as heating regions 36A to 36G in order from the upstream side to the downstream side in the transport direction X. As shown in FIG. Communication holes 38 are formed in the partition walls 37 at positions corresponding to the belt conveying areas 21C. The communication hole 38 is a through hole for allowing the object 91 to be fired to pass from the upstream side to the downstream side of the adjacent heating regions 36 .

The firing furnace 3 also includes a heating unit 40 for firing the object 91 to be fired. The heating section 40 includes an upper heating section 40U arranged above the belt conveying area 21C and a lower heating section 40L arranged below the belt conveying area 21C. The lower heating section 40L is arranged on the inner peripheral side of the belt 21 . The upper heating section 40U and the lower heating section 40L constitute a pair of heating sections 40 that face each other with the belt conveying area 21C interposed therebetween.

The upper heating unit 40U and the lower heating unit 40L of the present embodiment heat the object to be baked 91 at different temperatures in the plurality of heating regions 36, respectively. That is, the upper heating section 40U and the lower heating section 40L heat the object to be baked 91 at different temperatures in the adjacent heating regions 36 . The heating temperature of each of the heating regions 36A to 36G by the upper heating unit 40U and the lower heating unit 40L is based on the amount of moisture contained in the object to be baked 91 before heating, the target baking doneness of the baked product 92, and the like. is predetermined.

An exhaust duct 39 is provided in the upper part of the firing furnace 3 . An exhaust fan is connected to the exhaust duct 39 on the side opposite to the connection side with the baking furnace 3 . Thereby, the exhaust duct 39 can discharge the air in the baking space 35 to the outside. An exhaust duct 39 is provided for each of the plurality of heating regions 36 . When the object 91 to be baked is baked in the baking furnace 3 , moisture contained in the object 91 to be baked is removed from the object 91 to be baked. The moisture removed from the object to be fired 91 is included in the air in the firing space 35 . If the amount of moisture contained in the air in the firing space 35 becomes too large, the moisture cannot be properly removed from the object 91 to be fired. In the firing furnace 3, the air containing moisture is discharged from the firing space 35 through the exhaust duct 39, so that the amount of moisture contained in the air in the firing space 35 can be kept low. Thereby, continuous baking can be performed appropriately.

FIG. 2 is a cross-sectional view of the continuous baking apparatus 1 taken along line AA shown in FIG. That is, FIG. 2 is a cross-sectional view at the position of the heating region 36A of the continuous baking apparatus 1. As shown in FIG. However, the heating regions 36B to 36G other than the heating region 36A can also have the same configuration.

As shown in FIG. 2, the firing furnace 3 is provided with a vertical adjustment section 80 capable of vertically moving the upper heating section 40U. The vertical adjustment section 80 has a shaft portion 81 and a handle 82 provided on the shaft portion 81 . The upper heating section 40U is provided on the lower end side of the shaft section 81 . The upper end side of the shaft portion 81 penetrates the upper outer wall 31 and protrudes upward from the firing furnace 3 . The handle 82 is provided above the shaft portion 81 and outside the firing furnace 3 . The vertical adjustment unit 80 can vertically move the upper heating unit 40U by rotating the handle 82 in one direction or the other direction around the shaft portion 81 . Thereby, the height of the upper heating unit 40U can be adjusted.

The height adjustment of the upper heating unit 40U by the vertical adjustment unit 80 is performed according to the thickness of the object 91 to be fired, for example. Specifically, the height adjustment of the upper heating unit 40U by the vertical adjustment unit 80 is performed, for example, by firing an object 91 having a certain thickness and then firing an object 91 having a different thickness. done before. The vertical adjustment section 80 is provided for each of the plurality of heating regions 36 of the upper heating section 40U. Therefore, in the continuous baking apparatus 1, the height of the upper heating section 40U can be adjusted for each heating region 36. FIG.

The continuous baking apparatus 1 has a control section 85 . The control section 85 is for controlling each section in the continuous baking apparatus 1 . Specifically, the control unit 85 controls, for example, the driving of the motor 25 of the conveyor 2, the heating by the heating unit 40, the exhaust from the exhaust duct 39, and the like.

Next, configurations of the upper heating unit 40U and the lower heating unit 40L according to the present embodiment will be described. FIG. 3 is an enlarged view of the upper heating section 40U and the lower heating section 40L. FIG. 3 shows the upper heating section 40U and the lower heating section 40L in the heating region 36 having the same heating temperature. As shown in FIG. 3 , both the upper heating section 40U and the lower heating section 40L each have a plurality of heaters 41 within one heating area 36 .

The heater 41 has a heating plate 50 and a sheathed heater 60 . The heating plate 50 is a plate-like member provided facing the belt conveying area 21C. The heating plate 50 preferably has a uniform temperature when heating the object 91 to be baked. This is because the object 91 to be fired can be uniformly heated. Moreover, it is preferable that the heating plate 50 can reach the target temperature early after the start of heating. For this reason, it is preferable to use a metal with a low specific heat as the heating plate. Specifically, titanium or stainless steel can be used as the material of the heating plate 50 . The heating plate 50 has a heating surface 51 on the belt conveying area 21</b>C side and a heater surface 52 that is the back surface of the heating surface 51 .

A heating surface 51 of the heating plate 50 faces the belt conveying area 21C. A sheathed heater 60 is provided in contact with the heater surface 52 of the heating plate 50 . The heater 41 of the upper heating unit 40U is provided with the heating surface 51 of the heating plate 50 facing downward. The heater 41 of the lower heating section 40L is provided with the heating surface 51 of the heating plate 50 facing upward. That is, the heater 41 of the upper heating section 40U and the heater 41 of the lower heating section 40L are attached upside down. The sheathed heater 60 is a heating element that generates heat when electricity flows and heats the heating plate 50 by thermal conduction.

FIG. 4 is a plan view of the upper heating section 40U in the heating region 36 with the same heating temperature. The heater 41 of the lower heating section 40L also has the same configuration as that of the upper heating section 40U. As shown in FIG. 4 , the heating plate 50 is wider than the belt width 21Y of the belt 21 in the width direction Y of the belt 21 . A plurality of objects to be fired 91 are placed side by side in the transport direction X and the width direction Y in the belt transport area 21C. FIG. 4 shows the width 91Y of the area where the object to be baked 91 is placed in the belt conveying area 21C.

The sheathed heater 60 is linear, and is provided in the conveying direction X while being bent in a meandering manner in the width direction Y of the belt 21 . An end of the linear sheathed heater 60 is connected to the controller 85 . Thereby, the controller 85 can control the heat generation of the sheathed heater 60 . The controller 85 can cause the sheathed heater 60 to generate heat at a predetermined temperature.

Further, the sheathed heater 60 has a plurality of linear portions 61 extending in the width direction Y. As shown in FIG. The plurality of linear portions 61 are arranged side by side in the transport direction X. As shown in FIG. Equally spaced gaps are provided between two adjacent linear portions 61 . Therefore, the sheathed heater 60 can uniformly heat the region of the heating plate 50 corresponding to the region on which the object to be baked 91 is placed.

The sheathed heater 60 has a bent portion 62 at one end in the width direction Y of the linear portion 61 . The bent portion 62 connects two adjacent linear portions 61 at their one ends. Further, in this embodiment, as shown in FIG. 4, the length of the straight portion 61 in the width direction Y is the same length as the belt width 21Y. As a result, all of the bent portions 62 are located outside the region in which the object to be fired 91 is placed in the width direction Y. As shown in FIG. Therefore, the sheathed heater 60 can uniformly heat the region of the heating plate 50 corresponding to the region where the object to be baked 91 is placed in the width direction Y. As shown in FIG.

That is, the sheathed heater 60 is kept at a set constant temperature during heat generation. When the sheathed heater 60 generates heat, the heating plate 50 in contact with the sheathed heater 60 is heated by heat transfer from the sheathed heater 60 . The heating plate 50 is maintained at a uniform temperature as a whole by heating from the sheathed heater 60 . That is, in the heater 41 , the heat generated by the sheathed heater 60 is evened out by the heating plate 50 . Thereby, the heater 41 heats the object to be heated facing the heating surface 51 of the heating plate 50 by thermal radiation. The degree of heating by heat radiation from the heating surface 51 is uniform in both the transport direction X and the width direction Y. As shown in FIG.

The heater 41 of this embodiment can thus control the heating temperature for each heating surface 51 that is wide in both the transport direction X and the width direction Y. As shown in FIG. Therefore, while using the sheathed heater 60 which is a linear heating element, it is possible to control the heating temperature in a wide range by controlling the temperature of the sheathed heater 60 . That is, the number of sheathed heaters 60 requiring temperature control is small, and the wiring work with the controller 85 is easy. In addition, the number of sheathed heaters 60 that require temperature control is small, and complication of control is suppressed.

Moreover, as shown in FIGS. 3 and 4, the upper heating section 40U and the lower heating section 40L of this embodiment each have a plurality of heaters 41 in the transport direction X. As shown in FIGS. That is, the upper heating section 40U has an upper same-temperature heating plate group 50SU made up of a plurality of heating plates 50 in the same heating region 36 . Further, the lower heating section 40L has a lower same-temperature heating plate group 50SL composed of a plurality of heating plates 50 in the same heating region 36 .

During baking, the control unit 85 controls the sheathed heaters 60 of the plurality of heaters 41 constituting the upper heating unit 40U in the heating region 36 having the same heating temperature so as to have the same temperature. Adjacent heating plates 50 in the upper same-temperature heating plate group 50SU are in contact with each other at their ends in the transport direction X during baking. The same applies to the lower heating section 40L.

Therefore, in the heating region 36 having the same heating temperature, the upper heating unit 40U and the lower heating unit 40L heat the object to be baked 91 at the boundary between the two adjacent heaters 41 to the same degree as at other locations. Can be heated. In other words, the upper heating section 40U and the lower heating section 40L can heat the object to be heated uniformly in the transport direction X in the heating region 36 having the same heating temperature, although the plurality of heaters 41 are provided. It is sufficient that the adjacent heating plates 50 are in contact with each other during baking. In other words, if the heating plates 50 expand as the temperature rises, a gap may be provided between the adjacent heating plates 50 at room temperature when baking is not performed.

The upper heating unit 40U and the lower heating unit 40L having such a heater 41 can appropriately heat the object to be baked 91 via the heating surface 51 of the heating plate 50 by generating heat from the sheathed heater 60. can.

As shown in FIG. 3, the heating surface 51 of the heater 41 of the upper heating section 40U faces the upper surface 21A of the belt conveying area 21C. The heating plate 50 is in the form of a flat plate provided facing the belt conveying area 21C. That is, the heating surface 51 of the heating plate 50 has a shape along the belt conveying area 21C, and the distance from the upper surface 21A of the belt conveying area 21C is constant. Then, the heater 41 of the upper heating section 40U heats the object to be baked 91 placed on the upper surface 21A of the belt conveying area 21C by thermal radiation from above.

Therefore, the degree of heating of the object 91 to be fired by the heater 41 of the upper heating section 40U is uniform in the width direction Y in each heating region 36 . In other words, the heater 41 of the upper heating section 40U can heat all of the objects to be baked 91 placed side by side in the width direction Y to a certain degree. Further, the degree of heating of the object 91 to be baked by the heater 41 of the upper heating unit 40U is uniform in the conveying direction X. As shown in FIG. That is, the heater 41 of the upper heating section 40U can always heat the object to be baked 91 moving in the conveying direction X to a constant degree in each heating region 36 .

Also, the heating surface 51 of the heater 41 of the lower heating section 40L faces the lower surface 21B of the belt conveying area 21C. The heating plate 50 is in the form of a flat plate provided facing the belt conveying area 21C. That is, the heating surface 51 of the heating plate 50 has a shape along the belt conveying area 21C, and the distance from the lower surface 21B of the belt conveying area 21C is constant. The heater 41 of the lower heating section 40L heats the belt conveying area 21C from below by thermal radiation.

Therefore, the degree of heating of the belt conveying area 21C by the heater 41 of the lower heating section 40L is uniform in the width direction Y in each heating area 36 . That is, the heater 41 of the lower heating section 40L can heat the belt conveying area 21C in the width direction Y to a certain extent. Further, the degree of heating of the belt conveying area 21C by the heater 41 of the lower heating section 40L is uniform in the conveying direction X. As shown in FIG. That is, the heater 41 of the lower heating section 40L can always heat the belt conveying area 21C moving in the conveying direction X to a constant degree in each heating area 36 .

An object 91 to be baked is placed on the upper surface 21A of the belt conveying area 21C heated by the lower heating section 40L. Therefore, the belt conveying area 21C heats the object to be baked 91 placed on the upper surface 21A by thermal conduction. That is, the heater 41 of the lower heating section 40L heats the objects to be baked 91 placed side by side in the width direction Y in each heating area 36 via the belt conveying area 21C to a certain degree. be able to. Furthermore, the heater 41 of the lower heating section 40L can always heat the object to be baked 91 moving in the conveying direction X via the belt conveying area 21C to a certain degree in each heating area 36. .

Thus, in this embodiment, each heating region 36 can be uniformly heated in the transport direction X and the width direction Y by the upper heating unit 40U and the lower heating unit 40L. That is, in the continuous baking apparatus 1 of the present embodiment, the object to be heated, for example, is not heated more strongly at the position directly under the heater than at the position between the heaters. Therefore, as shown in FIG. 3, the upper heating unit 40U can be arranged at a position close to the object to be fired 91 to be heated. In addition, the lower heating section 40L can be arranged at a position close to the belt conveying area 21C to be heated.

Here, in general, the heating efficiency of the heat source tends to decrease as the distance from the heat source to the object to be heated increases. On the other hand, in the continuous baking apparatus 1 of the present embodiment, the upper heating section 40U and the lower heating section 40L can be arranged at positions close to the object to be baked 91 and the belt conveying area 21C, which are the objects to be heated, respectively. Therefore, the upper heating unit 40U can efficiently heat the object 91 to be baked. Further, the lower heating section 40L can efficiently heat the belt conveying area 21C. As a result, the upper heating unit 40U and the lower heating unit 40L can appropriately heat the object 91 under desired conditions while suppressing the amount of heat generated by the sheathed heater 60 .

Further, in the continuous baking apparatus 1, the height of the heating space 42 formed between the heating plate 50 of the heater 41 of the upper heating section 40U and the heating plate 50 of the heater 41 of the lower heating section 40L is narrow. . Therefore, heat emitted from the heating space 42 can be reduced. Therefore, the upper heating section 40U and the lower heating section 40L can heat the object to be baked 91 more efficiently.

Further, as described above, the upper heating section 40U and the lower heating section 40L can uniformly heat the heating surface 51 in both the transport direction X and the width direction Y in each heating region 36 . Therefore, the plurality of objects to be fired 91 can be densely arranged in both the transport direction X and the width direction Y. As shown in FIG. Therefore, the continuous baking apparatus 1 can manufacture a large amount of baked products 92 in a short time.

FIG. 5 is a diagram showing the upper heating section 40U and the lower heating section 40L at the boundary of the heating region 36. As shown in FIG. FIG. 5 shows a boundary between a heating region 36A and a heating region 36B as an example of a boundary between adjacent heating regions 36. As shown in FIG. The same applies to boundaries between other adjacent heating regions 36 . In the continuous baking apparatus 1, as described above, the heating temperature of the object 91 to be baked differs between the adjacent heating regions 36. FIG. That is, the sheathed heater 60 of the upper heating section 40U in the heating area 36A and the sheathed heater 60 of the upper heating section 40U in the heating area 36B are controlled to have different temperatures. The same applies to the lower heating section 40L.

FIG. 5 shows the heater 41 positioned most downstream in the transport direction X among the plurality of heaters 41 that constitute the upper heating section 40U and the lower heating section 40L of the heating region 36A. Also, the heater 41 positioned most upstream in the transport direction X among the plurality of heaters 41 constituting the upper heating section 40U and the lower heating section 40L of the heating region 36B is shown. That is, FIG. 5 shows the heater 41 provided in the heating region 36A and positioned at the end on the heating region 36B side, and the heater 41 provided in the heating region 36B and positioned at the end on the heating region 36A side. ing.

As shown in FIG. 5, the heating plate 50 of the upper heating portion 40U of the heating region 36A and the heating plate 50 of the upper heating portion 40U of the heating region 36B are not in contact with each other, and there is a gap between them. S is provided. The same applies to the lower heating section 40L. In addition, FIG. 5 shows the time of firing.

That is, in the continuous baking apparatus 1, the heating plates 50 of the two adjacent heating regions 36 are configured to be less affected by the temperature of the other during baking. Therefore, the upper heating section 40U and the lower heating section 40L can heat the object to be baked 91 at a predetermined accurate temperature for each heating region 36 . Thereby, the continuous baking apparatus 1 can manufacture the baked product 92 with high quality.

<Example>
Next, an example of this embodiment will be described. The inventors of the present invention conducted an experiment of firing an object to be fired using a firing apparatus of an example according to the present invention and a comparative example different from the present invention.

In the examples, the object to be fired was fired using the continuous firing apparatus 1 described in the first embodiment. As the material to be baked, a biscuit dough having a water content of 2% and a thickness of 4 mm was used. Further, in the embodiment, the heating temperature by the heating unit 40 is set so that the heating region 36 on the downstream side in the transport direction X has a lower temperature. Specifically, the heating region 36A is 195°C, the heating region 36B is 190°C, the heating region 36C is 185°C, the heating region 36D is 175°C, the heating region 36E is 165°C, the heating region 36F is 160°C, and the heating region 36G is was set to 155°C. A titanium plate having a thickness of 1 mm was used as the heating plate 50 . Then, the size of the gap between the heating plate 50 of the upper heating section 40U and the heating plate 50 of the lower heating section 40L was set to 13 mm, and adjustments were made so that the heating space 42 was formed as narrow as possible.

In the comparative example, firing was carried out by means of a device in which the object to be fired was transported into the interior of the firing furnace by means of a conveyor while the interior of the firing furnace was heated by burning gas. A line burner was used as a heating source. Also in the comparative example, the same thing as the example was used as the object to be fired. Also, in the comparative example, heating was performed so that the heating temperature became lower toward the downstream side in the conveying direction, and the transition of the heating temperature was generally the same as in the example. That is, even in the comparative example, the conditions were such that the object to be fired was heated at approximately the same heating temperature as in the example at each time from the start to the end of firing.

As a result of comparing the baked products obtained in the examples and the comparative examples, it was confirmed that the qualities such as taste, texture, and baked color were comparable. That is, it was confirmed that the examples according to the present invention yielded high-quality fired products comparable to the comparative examples using the conventional method of heating the inside of the furnace by burning gas. Moreover, in the example, the baking apparatus could be constructed at a lower cost than in the comparative example. As a result, it was also confirmed that baked products can be produced more inexpensively in the examples than in the comparative examples.

Furthermore, in the comparative example, it is necessary to heat the entire space in the firing furnace to a high temperature. For this reason, even if the outer wall of the firing furnace has a heat-insulating structure, the environmental temperature around the firing device rises, and this sometimes imposes a burden on the worker. In contrast, in the continuous baking apparatus 1 of the embodiment, only the heating space 42 between the heating plates 50 of the upper heating section 40U and the lower heating section 40L needs to be heated to a high temperature. That is, even in the firing furnace 3, the temperature is not so high except for the heating space 42. Therefore, in the embodiment, an increase in environmental temperature around the device is suppressed. Thereby, in the embodiment, the working environment of the worker can be maintained in a comfortable environment.

As described above in detail, the continuous baking apparatus 1 according to the present embodiment can continuously bake the object 91 to be baked by heating while conveying the object 91 to be baked in the conveying direction X. . A continuous baking apparatus 1 includes a conveyor 2 and a heating section 40 . The conveyor 2 has an endless belt 21 and a motor 25 for rotating the belt 21 . The motor 25 rotates the belt 21 so that the object to be baked 91 placed on the upper belt conveying area 21C of the belt 21 moves in the conveying direction X. The heating section 40 is composed of an upper heating section 40U and a lower heating section 40L. The upper heating section 40U is arranged above the belt conveying area 21C. The lower heating section 40L is arranged below the belt 21 and on the inner peripheral side of the belt 21 . The upper heating section 40U and the lower heating section 40L each include a flat heating plate 50 provided facing the belt conveying area 21C and a sheathed heater 60 provided on the heater surface 52 of the heating plate 50. have. With such a configuration, the heat generated by the sheathed heater 60 can be leveled by the heating plate 50 in the upper heating unit 40U and the lower heating unit 40L. In other words, it is possible to suppress the occurrence of an extreme temperature difference in the heating plate 50 . Therefore, both the upper heating section 40U and the lower heating section 40L can be brought closer to the object to be heated. Therefore, the object 91 to be fired can be efficiently fired in the narrow heating space 42 . Furthermore, since the heat generated from the sheathed heater 60 is evened out by the heating plate 50, it is possible to suppress the difference in the degree of progress of baking of the object 91 to be baked. That is, it is possible to suppress insufficient baking and scorching of the object 91 to be baked. Therefore, the continuous baking apparatus 1 can manufacture high-quality baked products 92 while suppressing energy consumption.

Further, the conveyor 2 uses a stainless steel sheet as the belt 21 . By using the sheet-like metal belt 21 in this way, the deposits adhering to the belt 21 can be easily removed. In addition, it is possible to prevent the oil and the like coming out of the object to be baked 91 from dripping below the belt 21 during baking. That is, it is possible to prevent oil from adhering to the lower heating portion 40L. As a result, the baked product 92 can be manufactured with stable quality over a long period of time in a clean environment.

As the belt 21, a mesh belt configured by weaving linear metal in a mesh shape can also be used. When a mesh belt is used as the belt 21, it is preferable to use a belt with a low opening ratio. Specifically, the opening ratio of the mesh belt used as the belt 21 is preferably 10% or less, more preferably 8% or less. A herringbone type mesh belt is preferable. This is because the herringbone type is generally constructed by densely weaving wires with a gap smaller than the wire diameter, and has a low aperture ratio. As such a mesh belt, specifically, for example, a T&H type mesh belt manufactured by Hara Kinami Co., Ltd., which has high tensile strength, can be used. This is because by using such a mesh belt for the belt 21 , it is possible to suppress the dregs (solids) and oil (liquid) that have fallen off the object to be baked 91 from dropping from the belt 21 . Also, mesh belts tend to be less expensive than sheet metal belts. Therefore, a mesh belt can be adopted as the belt 21 in consideration of the cost of the continuous baking apparatus 1 and the baked marks formed on the baked product 92 . On the other hand, when a sheet-shaped metal is used as the belt 21, the oil content on the belt 21 and the members of the conveyor 2 such as the belt 21 are scraped off during transportation more than when a mesh belt is used. Foreign matter tends to be easily removed from the belt 21 appropriately. In addition, by using a sheet-like metal as the belt 21, it is possible to suppress heat from escaping to the outside from the space between the belt conveying area 21C and the upper heating unit 40U. That is, by using a sheet-like metal as the belt 21, there is a tendency that the object to be fired 91 can be heated more efficiently than when a mesh belt is used. Therefore, from these viewpoints, it is preferable to use a sheet-shaped metal belt as the belt 21 .

The sheathed heater 60 is a linear heating element and has a plurality of straight portions 61 extending in the width direction Y of the belt 21 and a bent portion 62 connecting the ends of the two straight portions 61 . The plurality of linear portions 61 are arranged side by side in the transport direction X. As shown in FIG. The bent portion 62 is located outside the area in the belt conveying area 21C where the object to be baked 91 is placed in the width direction Y. As shown in FIG. As a result, the upper heating unit 40U and the lower heating unit 40L can uniformly heat the object 91 in the width direction Y. As shown in FIG. Unlike the present embodiment, if the heating temperature is non-uniform in the width direction, the baked products baked at different positions in the width direction will be baked differently. In other words, there is a risk that the quality of the baked product will vary. On the other hand, the continuous baking apparatus 1 according to the present embodiment can stably produce the baked products 92 of high quality.

In addition, the upper heating section 40U and the lower heating section 40L heat the object to be baked 91 at different heating temperatures for each of the plurality of heating regions 36 provided in the transport direction X. As shown in FIG. As a result, the heating temperature of the object 91 to be fired can be changed appropriately at each time from the start to the end of firing. That is, for example, in the early stage of firing, the amount of moisture removed from the object to be fired 91 is increased by heating at a high temperature, and in the later stage of firing, the object to be fired 91 is heated at a lower temperature than in the initial stage. It is possible to finely adjust the moisture content of the object to be baked 91 while suppressing the scorching of the object. Therefore, a baked product 92 of high quality can be manufactured.

In addition, in the upper heating unit 40U, a plurality of heating plates 50 are provided in the transport direction X within the heating region 36 having the same heating temperature, thereby forming an upper same temperature heating plate group 50SU. Two adjacent heating plates 50 in the upper same-temperature heating plate group 50SU are in contact with each other at their ends at least when the object 91 to be baked is heated. Similarly, the lower heating section 40L also has a lower same-temperature heating plate group 50SL composed of a plurality of heating plates 50 in the heating region 36 having the same heating temperature. Further, the two adjacent heating plates 50 in the lower same-temperature heating plate group 50SL are in contact with each other at their ends at least when the object 91 to be baked is heated. As a result, when there are a plurality of heating plates 50, the upper heating section 40U and the lower heating section 40L in the heating region 36 having the same heating temperature can suppress a decrease in the heating temperature even at the boundary between them. Unlike this embodiment, if there is a transport position where the actual heating temperature is lower than the target temperature in the transport direction X, the firing of the object to be fired at that position does not proceed, and the total length of the firing furnace may be increased. It becomes necessary. However, the larger the firing furnace, the more energy required for firing. On the other hand, in the continuous baking apparatus 1 according to the present embodiment, the baked product 92 with high quality can be manufactured while suppressing the consumption of energy.

Further, in the continuous baking apparatus 1, for example, the heating plate 50 positioned at the end of the heating region 36A on the heating region 36B side and the heating plate 50 positioned at the end of the heating region 36B on the heating region 36A side are in a non-contact state with a gap S provided between them. The same is true for other adjacent heating areas 36 . That is, the heating plates 50 positioned in the adjacent heating regions 36 are kept in a non-contact state at least when the object 91 to be baked is heated. As a result, it is possible to prevent the temperature of the heating plate 50 from changing due to the heating temperature of the other heating regions 36 . Therefore, the object to be baked 91 can be heated at an accurate heating temperature predetermined for each heating region 36 . Therefore, a baked product 92 of high quality can be manufactured.

<Second embodiment>
Next, a second embodiment different from the first embodiment will be described. Also in this embodiment, the configuration of the continuous firing apparatus is generally the same as in the above embodiment. In the continuous baking apparatus of this embodiment, the configuration at the ends of the plurality of heating plates is different from that of the above embodiments.

FIG. 6 is a diagram showing the upper heating section 140U and the lower heating section 140L of the continuous baking apparatus 10 according to this embodiment. FIG. 6 shows the configuration of the upper heating section 140U and the lower heating section 140L within the same heating region 36. As shown in FIG. As shown in FIG. 6, each of the upper heating section 140U and the lower heating section 140L of the present embodiment has a plurality of heaters 41 within one heating region 36. As shown in FIG. The heater 41 of this embodiment also has the same sheathed heater 60 as in the above embodiment. Further, the upper heating unit 140U composed of a plurality of heaters 41 has an upper same-temperature heating plate group 150SU composed of a plurality of heating plates 150. As shown in FIG. Further, the lower heating section 140L composed of a plurality of heaters 41 has a lower same-temperature heating plate group 150SL composed of a plurality of heating plates 150. As shown in FIG.

Also in this embodiment, the adjacent heating plates 150 of the upper same-temperature heating plate group 150SU are brought into contact with each other at their ends in the conveying direction X during firing. However, the heating plate 150 of this embodiment differs in the shape of the end portion that contacts the adjacent heating plate 150 of the upper same temperature heating plate group 150SU.

Specifically, the side surfaces of the end portions of the heating plates 150 where adjacent heating plates 150 exist in the upper same-temperature heating plate group 150SU are inclined surfaces facing each other along with the side surfaces of the adjacent heating plates 150. ing. The left side surface of the right heating plate 150 in FIG. 6 is an inclined surface protruding leftward toward the upper side. The right side surface of the left heating plate 150 is an inclined surface protruding rightward toward the bottom.

Therefore, the left end of the right heating plate 150 warps upward along the inclined surface of the right end of the left heating plate 150 when the length in the transport direction X increases due to thermal expansion. shape. The right end of the left heating plate 150 curves upward along the inclined surface of the left end of the right heating plate 150 when its length in the transport direction X increases due to thermal expansion. becomes. As a result, two adjacent heating plates 150 in upper same-temperature heating plate group 150SU can be prevented from being damaged by compressive stress during thermal expansion. Therefore, two adjacent heating plates 150 in the upper same-temperature heating plate group 150SU can be brought into contact while suppressing damage due to thermal expansion during heating of the object 91 to be baked.

The end shape of the heating plate 150 is not limited to the shape shown in FIG. That is, the shape of the end portion of the heating plate 150 is such that it can thermally expand in the transport direction X and deform in a direction different from the transport direction X when it comes into contact with the adjacent heating plates 150 in the upper same-temperature heating plate group 150SU. I wish I had. That is, when heating the object 91 to be baked, the end portion of the heating plate 150 is in contact with the adjacent heating plate 150 in the upper same temperature heating plate group 150SU, so that the end portion of the heating plate 150 moves in the direction intersecting the conveying direction X more than at room temperature. Any shape can be used as long as it moves. The same applies to the lower same-temperature heating plate group 150SL.

FIG. 7 is a diagram showing the upper heating section 140U and the lower heating section 140L at the boundary of the heating region 36 of the continuous baking apparatus 10 according to this embodiment. FIG. 7 shows a boundary between a heating region 36A and a heating region 36B as an example of a boundary between adjacent heating regions 36. As shown in FIG. The same applies to boundaries between other adjacent heating regions 36 . Also in the continuous baking apparatus 10 , the heating temperature of the object 91 to be baked differs between the adjacent heating regions 36 . FIG. 7 shows the heater 41 provided in the heating region 36A and positioned at the end on the heating region 36B side, and the heater 41 provided in the heating region 36B and positioned at the end on the heating region 36A side. .

As shown in FIG. 7, the heating plate 150 of the upper heating portion 140U of the heating region 36A and the heating plate 150 of the upper heating portion 140U of the heating region 36B are not in direct contact, and there is a gap S between them. is provided. A heat insulating material 170 is sandwiched in the gap S. The heat insulator 170 is, for example, fixed to one of the two adjacent heating plates 150 .

The heat insulating material 170 is made of a material having a lower thermal conductivity than the heating plate 150 . Specifically, for example, the heat insulating material 170 preferably has a heat resistant temperature equal to or higher than the heat generation temperature of the sheathed heater 60 . Specifically, for example, as the heat insulating material 170, a phenol resin-based foam heat insulating material having a heat resistance temperature of 400° C. or higher, a ceramic-based fibrous heat insulating material such as alumina fiber or glass fiber, or the like can be used. Similarly, in the lower heating section 140L, the heat insulating material 170 is sandwiched between the heating plates 150 of the adjacent heating regions 36 .

As a result, the continuous baking apparatus 1 is configured such that the heating plates 150 of the two adjacent heating regions 36 are less likely to be affected by the temperature of the other. Therefore, the upper heating unit 140U and the lower heating unit 140L can heat the object 91 to be baked at an accurate temperature predetermined for each heating region 36 . Therefore, the continuous baking apparatus 1 can manufacture the baked product 92 with high quality.

As described above in detail, in the continuous baking apparatus 10 according to the present embodiment as well, the upper heating unit 140U and the lower heating unit 140L each heat the object 91 to be baked for each of the plurality of heating regions 36 provided in the conveying direction X. are heated at different heating temperatures. For example, between the heating plate 150 positioned at the end of the heating region 36B side within the heating region 36A and the heating plate 150 positioned at the end of the heating region 36B side of the heating region 36B, A heat insulator 170 is sandwiched. The same is true for other adjacent heating areas 36 . As a result, it is possible to prevent the temperature of the heating plate 150 from changing due to the heating temperature of the other heating regions 36 . Therefore, the object to be baked 91 can be heated at an accurate heating temperature predetermined for each heating region 36 . Therefore, a baked product 92 of high quality can be manufactured.

Furthermore, in the continuous baking apparatus 10 as well, the upper heating unit 140U is provided with a plurality of heating plates 150 in the conveying direction X within the heating region 36 having the same heating temperature, thereby forming an upper same-temperature heating plate group 150SU. ing. When heating the object 91 to be baked, the end portion of the heating plate 150 is in contact with the adjacent heating plate 150 in the upper same temperature heating plate group 150SU, so that the end portion of the heating plate 150 moves in the direction intersecting the conveying direction X more than at room temperature. It is a moving shape. It is possible to prevent two adjacent heating plates 150 in the upper same temperature heating plate group 150SU from being damaged by compressive stress during thermal expansion. Therefore, two adjacent heating plates 150 in the upper same-temperature heating plate group 150SU can be brought into contact while suppressing damage due to thermal expansion during heating of the object 91 to be baked. The same applies to the lower same-temperature heating plate group 150SL.

In this manner, in the continuous baking apparatus 10, thermal expansion of the heating plates 150 in the conveying direction X can be absorbed at the boundary between two adjacent heating plates 150 in the upper same-temperature heating plate group 150SU. Therefore, it is possible to suppress narrowing of the gap S between the heating plates 150 at the boundary between the two adjacent heating regions 36 due to the thermal expansion of the heating plates 150 . The same applies to the lower same-temperature heating plate group 150SL. That is, it is possible to prevent the thermally expanded heating plate 150 from receiving a force in the direction of compressing the heat insulating material 170 . Therefore, damage to the heat insulating material 170 due to thermal expansion of the heating plate 150 can be suppressed.

<Modification>
The above embodiments can also combine parts of different embodiments. For example, part of the second embodiment can be combined with the continuous firing apparatus of the first embodiment. Specifically, in the second embodiment, a structure has been described in which the thermal expansion of the heating plates can be absorbed at the boundary between two adjacent heating plates in the same temperature heating plate group. You may apply such a structure to the continuous baking apparatus of 1st Embodiment. Further, in the second embodiment, the configuration in which the heat insulating material is provided in the gap between the heating plates located at the boundary between the two adjacent heating regions has been described. You may apply such a structure to the continuous baking apparatus of 1st Embodiment.

Further, the above embodiment can be modified without changing the gist of the present invention. For example, in the above embodiments, biscuits and cookies are described as examples of baked products. However, it is also possible, for example, to produce other baked products. However, the overall configuration described in the above embodiment is particularly suitable for manufacturing western confectionery containing wheat and oil as the main raw material.

Further, in the above embodiment, the heating section has seven heating regions in which the object to be baked is heated at different temperatures in the conveying direction. However, the number of heating regions with different heating temperatures is not limited to seven. Further, for example, the heating temperatures of two adjacent heating regions may be different, and heating regions having the same heating temperature may be provided among a plurality of heating regions.

Further, in the above embodiment, an example in which sheathed heaters are employed as heaters as heat sources for the upper heating section and the lower heating section has been described. However, other types of heaters may be used, for example. Also, for example, the path of the sheathed heater is not limited to the pattern shown in FIG. For example, the portion described as the linear portion 61 may have a shape that extends in the width direction Y and meanders in the transport direction X. As shown in FIG.

Further, in the above-described embodiment, the continuous baking apparatus 1 for baking Western confectionery such as biscuits and cookies containing wheat and oil as the main raw material has been specifically described. However, a continuous baking apparatus configured like the continuous baking apparatus 1 can be used not only for confectionery according to the above embodiment, but also for roasting tea, roasting sesame seeds or coffee, and roasting nuts (eg, almonds, cashew nuts, peanuts, etc.). etc. can also be used. In such a case, the heating temperature and the like of the continuous baking apparatus may be determined according to the object to be baked.

Reference Signs List 1, 10 Continuous baking device 2 Conveyor 21 Belt 21C Belt conveying area 25 Motor 36 Heating area 40 Heating units 40U, 140U Upper heating units 40L, 140L Lower heating units 50, 150 Heating plates 50SU, 150SU Upper same temperature heating plate group 50SL , 150SL lower same temperature heating plate group 60 sheathed heater 61 straight portion 62 curved portion 91 object to be fired 92 fired product 170 heat insulating material S gap

Claims (7)

A continuous firing apparatus for continuously firing an object to be fired by heating the object to be fired while transporting the object in the transport direction,
an endless belt, and a conveyor having a drive unit that rotates the belt in a direction in which an object to be baked placed in a belt conveying area, which is an upper area of the belt, moves in the conveying direction;
An upper heating unit arranged above the belt conveying area, and a heating unit having a lower heating unit arranged below the belt conveying area and on the inner peripheral side of the belt,
The upper heating section and the lower heating section each
A continuous baking characterized by comprising a flat heating plate provided opposite to the belt conveying area, and a heater provided on the back surface of the heating plate opposite to the belt conveying area. Device. In the continuous firing apparatus according to claim 1,
A continuous baking apparatus, wherein the belt is made of sheet metal. In the continuous firing apparatus according to claim 1 or claim 2,
The heater is a linear heating element and has a plurality of width direction portions extending in the width direction of the belt and a connection portion connecting the ends of the two width direction portions,
The plurality of width direction portions are arranged side by side in the conveying direction,
The continuous baking apparatus, wherein the connecting portion is positioned outside, in the width direction, an area in which the object to be baked is placed in the belt conveying area. In the continuous firing apparatus according to any one of claims 1 to 3,
The continuous baking apparatus, wherein the heating unit includes a plurality of heating regions in which the object to be baked is heated at different temperatures in the conveying direction. In the continuous firing apparatus according to claim 4,
a same-temperature heating plate group including a plurality of heating plates provided in the conveying direction in the heating region having the same heating temperature;
A continuous baking apparatus, wherein two adjacent heating plates in the same temperature heating plate group are in contact with each other at their ends at least when heating an object to be baked. In the continuous firing apparatus according to claim 4 or 5,
The heating plate is provided in one heating region, which is one of the two adjacent heating regions, and is positioned at the end of the other heating region, which is the other heating region, and is provided in the other heating region, The heating plate located at the end of the one heating area side is in a non-contact state with a gap provided between them at least when the object to be baked is heated. . In the continuous firing apparatus according to claim 4 or 5,
The heating plate is provided in one heating region, which is one of the two adjacent heating regions, and is positioned at the end of the other heating region, which is the other heating region, and is provided in the other heating region, A continuous baking apparatus, wherein a heat insulating material having a lower thermal conductivity than that of the heating plate is provided between the heating plate located at the end of the one heating area side.

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