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Title:
CLEANABLE TUNNEL OVEN
Document Type and Number:
WIPO Patent Application WO/2017/191551
Kind Code:
A1
Abstract:
Device (10) for heat treatment of products, comprising an area (15) for heat treatment, defined by two oppositely arranged side walls (12, 13), one front side (101), and one rear side (102), a support (11) for the products, and at least one burner (161, 162, 171) configured for the heat treatment of the products on the support (11). The burner is movable relative to the heat treatment area between a first, operational, position, in which the burner is located inside the heat treatment area, and a second, maintenance, position, in which the burner is outside of the heat treatment area.

Inventors:
CLAYS, Wim (Pieter Pourbusstraat 13, 8670 Koksijde, 8670, BE)
Application Number:
IB2017/052532
Publication Date:
November 09, 2017
Filing Date:
May 02, 2017
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
AFO HEAT BVBA (Ondernemingenstraat 21, 8630 Veurne, 8630, BE)
International Classes:
F23C5/02; A21B1/02; A21B1/48; F26B23/00
Domestic Patent References:
WO1982002475A11982-08-05
Foreign References:
EP1452094A22004-09-01
EP1488700A12004-12-22
DE2013696A11970-10-15
US20120294596A12012-11-22
GB1240647A1971-07-28
EP0934699A21999-08-11
Other References:
None
Attorney, Agent or Firm:
PRONOVEM (Office Van Malderen, Ave. Josse Goffin 158, 1082 Brussels, 1082, BE)
Download PDF:
Claims:
CLAIMS

1. Device (10) for heat treatment of products, comprising:

an area (15) for heat treatment, defined by two oppositely arranged side walls (12, 13), a front side (101), and a rear side (102), wherein the front side comprises an opening configured for inserting the products into the heat treatment area,

a support (11) for the products, arranged in the heat treatment area,

at least one burner (161 , 162, 171) configured for the heat treatment of the products on the support,

characterised in that the burner is movable relative to the heat treatment area between a first, operational, position (203), in which the burner is located inside the heat treatment area, and a second, maintenance, position (204), in which the burner is arranged outside of the heat treatment area (15).

2. Device according to claim 1 , comprising a coverage (14) that delimits the heat treatment area (15) on an upper side.

3. Device according to claim 1 or 2, wherein the burner (161 ,

162, 171) is configured to execute a linear movement between the first position (203) and the second position (204).

4. Device according to any one of the preceding claims, wherein the movement of the burner (161 , 162, 171) between the first position (203) and the second position (204) proceeds along a direction transverse to the side walls

(12, 13).

5. Device according to any one of the preceding claims, wherein the side walls are parallel and the movement of the burner between the first position and the second position proceeds along a direction perpendicular to the side walls.

6. Device according to claim 4 or 5, wherein a first (13) one of the two side walls comprises an opening (131), wherein the burner (161) is movable through the opening when transiting between the first position (203) and the second position (204).

7. Device according to claim 6, comprising a cover plate (210) provided at one end of the burner and integrally movable together with the burner, such that, in the second position (204), the cover plate seals the opening (131) in the first side wall.

8. Device according to any one of the preceding claims, comprising a guide (200) on which the burner is arranged, wherein the guide is configured to guide the movement of the burner between the first position and the second position.

9. Device according to claim 8, wherein the guide comprises a guide element (201) and a slide (202), wherein the burner (161 , 162, 171) is attached to the slide, and wherein the slide runs over the guide element via a rolling contact.

10. Device according to claim 9, wherein the rolling contact is lubricant-free.

11. Device according to any one of claims 8 to 10, wherein the guide (200) is a linear guide.

12. Device according to claim 1 1 , wherein the linear guide (200) comprises at least one guide element (201), wherein the guide element extends transversely to the two side walls (12, 13).

13. Device according to any of the preceding claims, wherein the burner is a gas burner.

14. Device according to claim 13, wherein the burner is a metal fibre burner (30).

15. Device according to any one of the preceding claims, wherein the burner comprises a heat-radiating surface (163) facing the support (1 1) in the first position, and wherein the burner is arranged above the support.

16. Device according to any one of the preceding claims, comprising a bellows (220) arranged on an outer side of a first one (13) of the two side walls, wherein the bellows surrounds the burner in the second position.

17. Device according to any one of the preceding claims, comprising means (230) for preparing a gas/air mixture that is movable integrally with the burner (161 , 162, 171).

18. Device according to any one of the preceding claims, being a tunnel oven (10), and wherein the support (1 1) is a conveyor configured to transport the products into the tunnel oven through the front side (101) and out of the oven through the rear side (102).

19. Device according to claim 18, wherein the movement of the burner between the first position (203) and the second position (204) proceeds along a direction transverse to the side walls, wherein a first one (13) of the two side walls comprises an opening (131), wherein the burner is movable through the opening when transiting between the first position and the second position, wherein the device comprises a cover plate (210) provided at one end of the burner, which cover plate is movable integrally with the burner, such that, in the second position (204), the cover plate seals the opening (131) in the first side wall.

20. Device according to claim 18 or 19, which is modular in structure, comprising several modules (16, 17) that are arranged sequentially in a direction of transport of the conveyor (11), wherein each of the several modules is removably attached to the device.

21. Device according to claim 20, wherein each of the several modules has a same dimension in the direction of transport of the conveyor (11).

22. Device according to claim 20 or 21 , wherein each of the several modules comprises a fixed support (1 15) for the conveyor.

23. Device according to any one of the preceding claims, wherein at least one of the two side walls (12, 13) is double-walled, with an inner wall (124, 134) and an outer wall (123, 133) spaced apart from one another, and with an air cavity (125, 135) between the inner wall and the outer wall.

24. Device according to claim 23, comprising an extractor (14) extending over the heat treatment area (15), wherein the air cavity (125, 135) communicates with an exhaust line (141) of the extractor so as to maintain a forced air flow through the air cavity.

25. Use of the device (10) according to any one of the preceding claims, for the heat treatment of food products, preferably one or a combination of: meat, fish, vegetables, and bakery products.

Description:
CLEANABLE TUNNEL OVEN

[0001] The present invention is related to devices for heat treatment of products, in particular food products, on an industrial scale. In particular, the invention is related to devices of the above type, also referred to as ovens, comprising burners that are placed in the oven compartment.

[0002] During heat treatment of food products, such as, though not limited to, meat, fish, vegetables, and bakery products, juices are released that can partially be collected and partially remain in the oven, e.g., on the side walls or on the conveyor, etc. industrial ovens, such as e.g. tunnel ovens, must be regularly cleaned for hygienic reasons. In ovens of this type, it is known to place the conveyor on wheels, such that it can be taken out of the oven, which simplifies cleaning/maintenance. However, the inside of the tunnel ovens is difficult to access for cleaning/maintenance, in part due to the fact that burners, and possibly other components, are arranged in the tunnel. This hampers and slows down cleaning and maintenance of the oven, resulting in considerable downtime.

[0003] An object of the present invention is to provide an (industrial) oven allowing for faster and/or easier maintenance, such that downtime and/or idle time is reduced.

[0004] An object of the present invention is to provide an (industrial) oven that is more economically viable.

[0005] According to a first aspect, there is therefore provided a device for the heat treatment of products, more specifically food products, as set forth in the appended claims.

[0006] Devices according to the first aspect comprise an area or space for heat treatment defined by two side walls arranged opposite one another, a front side, and a rear side. The front side advantageously comprises an opening that can possibly be closed, through which the products are brought into the heat treatment area. Advantageously, the heat treatment area is delimited on the upper side by a coverage. These devices further comprise a support for the products that can be placed in the heat treatment area, and at least one, advantageously several, burners that are configured for the heat treatment of the products located on the support.

[0007] One feature of devices according to the first aspect is that the (at least one) burner is movable relative to the heat treatment area between a first, operational, position, in which the burner is inside the heat treatment area, and a second, maintenance position, in which the burner is outside of the heat treatment area. Making the burner movable in this manner allows, when in the second position, for simple, thorough cleaning of the heat treatment area, and possibly also the support, without any risk of damaging the burner. The burner will therefore also have a longer lifetime. Since the burner, when in the second position, does not obstruct the cleaning of the heat treatment area, cleaning is easier and can be carried out more quickly. Additionally, the burner becomes better accessible for maintenance or replacement when in the second position. Thus, idle times of the device are reduced, allowing for a more economically viable management of such industrial systems.

[0008] Preferably, the burner moves between the first and second positions in a transverse direction that is advantageously perpendicular to the side walls. The movement is preferably linear. Such an arrangement results in a simple construction, in which the front side of the heat treatment area is not obstructed. The side walls are advantageously arranged parallel to one another and are advantageously substantially flat. Advantageously, an opening is present in one of the side walls, through which the burner moves between the first and second positions. Preferably, when the burner is in the second position, the latter opening is sealed by a cover plate arranged at an end of the burner. Thus, a complete seal is obtained between the heat treatment area and the burners in the second position, thus facilitating the cleaning of the heat treatment area.

[0009] According to a second aspect of the present disclosure, a device for heat treatment of products is provided, comprising a heat treatment area defined by two side walls that are arranged opposite one another. At least one of the two side walls is double-walled, with an inner wall and an outer wall arranged at a distance from one another, and with an air cavity between the inner wall and the outer wall. Advantageously, the heat treatment area is delimited by a coverage on the upper side. This coverage comprises, or is formed by, an extractor extending over the heat treatment area, wherein the air cavity communicates with an exhaust line of the extractor and is configured for maintaining a forced air flow through the air cavity. Advantageously, the device comprises a fan that communicates with the exhaust line.

[0010] Features of devices according to the second aspect may be provided separately, or in combination with features of devices according to the first aspect.

[0011] According to a third aspect of the present disclosure, a use of the device according to the first aspect for heat treatment of food products is provided, as set forth in the appended claims. The food products may in particular be meat products, fish products, vegetable products, bakery products, or a combination thereof. 'Meat products' and 'fish products' refer to food products that are at least 50 % of animal origin (either meat or fish, respectively).

[0012] A method for the heat treatment of products, more specifically food products, is also disclosed.

[0013] Aspects of the invention will be discussed below by reference to the following figures, without being limited thereto; wherein the same or similar components are designated by the same reference numbers.

[0014] Fig. 1 shows a top view of a tunnel oven according to aspects of the invention.

[0015] Fig. 2 shows a cross section of the tunnel oven of Fig. 1 along line

A - A.

[0016] Fig. 3 is a perspective view of a module of the tunnel oven of Fig 1.

[0017] Fig. 4 is a side view of the module of Fig. 3.

[0018] Fig. 5 is a perspective view of the module of Fig. 3 in a state in which the burners have been removed from the oven.

[0019] Fig. 6 is a perspective view of a second module of the tunnel oven of Fig. 1 that is arranged downstream of the module of Fig. 3.

[0020] Fig. 7 is a side view of the module of Fig. 6.

[0021] Fig. 8 shows an exploded view and a cross sectional view according to line B-B of a metal fibre burner for use in tunnel ovens according to the invention.

[0022] Fig. 1 and 2 show a possible embodiment of a device 10 for the heat treatment of products, also referred to as an oven. Preferably, but not necessarily, the oven 10 is designed as a tunnel oven with a conveyor 1 1 that transports the products to be treated, advantageously in a continuous fashion, from an intake side 101 to an outlet side 102 of the oven 10. The tunnel oven 10 further comprises a first side wall 12 and a second side wall 13, which are arranged opposite one another and extend from the intake side 101 to the outlet side 102. Side walls 12 and 13 are spaced apart from one another, with the conveyor 11 running between the side walls 12 and 13. A coverage 14 covers the area or space 15 between the two side walls 12 and 13 along the top. The side walls 12 and 13 and the coverage 14 thus form a tunnel (i.e., the area 15), which is further defined by the intake side 101 and the outlet side 102, through which the conveyor 11 transports the products to be treated. In this area 15, the products are heat treated. Hereinafter, the area 15 will be referred to as the oven area. The side walls 12 and 13 and the coverage 14 are advantageously attached to a frame 104 of the tunnel oven 10.

[0023] One or more wall panels 121 , 122 of one or both side walls 12, 13 may be hinged so as to provide access to the oven area 15 of the tunnel oven 10. An exhaust line 141 may be provided in the coverage 14 and communicate with the oven area 15. Combustion gases produced in the area 15 may thus be extracted through the exhaust line 141. The bottom 103 of the tunnel oven 10 may advantageously be open. Drain trays 105, which are preferably removable, e.g., on idlers, may be provided along the bottom 103 in order to collect juices released by the food products during heat treatment.

[0024] Burners 161 , 162, 171 are arranged in the oven area 15. These burners are arranged such that the products on the conveyor 1 1 can be heat treated. Preferably, the burners comprise a heat-radiating surface 163 facing the conveyor. The heat-radiating surface is thus arranged in the oven area 15, between the side walls 12 and 13. The burners may be arranged above, below, or above and below the conveyor. Different types of heat treatment are possible, and several heat treatments may be provided sequentially in the tunnel oven 10.

[0025] There exist a wide range of burners, and these may generally all be used in devices according to the invention. The burners may be electrical burners, such as infrared burners. They may alternatively be gas burners, in particular premix burners. A known type of (premix) gas burner that may advantageously be used in the devices described herein - e.g., as burner 161 , 162, and/or 171 - is a metal fibre burner. Fig. 8 shows a typical structure of such a burner 30. In this kind of burner, a porous network 35 of metal fibres covers a premix manifold 32. A gas/air mixture that is produced in advance (i.e., the premix) is supplied via the manifold to the metal fibre network and brought to ignition. The premix is supplied via inlet 31 to manifold 32, which forms a first manifold chamber and which advantageously extends along the entire length of the metal fibre net 35. Burner 30 advantageously comprises a second manifold chamber 33, arranged between the first chamber 32 and the metal fibre net 35. The second manifold chamber can e.g. be tubular and can extend along the entire lentgh of the metal fibre net 35. This second manifold chamber advantageously comprises two oppositely arranged perforated sides 331 and 332, communicating with the first chamber 32 and the metal fibre net 35, respectively. A perforated cover plate 34 is advantageously arranged between the manifold chamber(s) and the metal fibre net 35, in order to support the latter. The cover plate 34 advantageously defines a third manifold chamber, arranged between side 332 (i.e., second manifold chamber 33) and the metal fibre net 35. With metal fibre burners, various modes of combustion are possible/commonly used. In a first mode, the combustion is maintained between (or on the surface of) the metal fibres. The metal fibre network glows and releases radiant heat. This is referred to as a 'radiant mode', in which the combustion typically is red/orange in colour. In a second mode, the flames are distributed along the outside of the metal fibre network and distribute heat primarily via convection. The latter is referred to as 'blue flame mode'. An example of a metal fibre network is Bekinit ® 200S (Bekaert, Belgium).

[0026] The tunnel oven 10 is advantageously modular in structure, advantageously comprising a succession of several modules 16, 17, which are preferably removably attachable to one another or to a (main) frame 104 of the oven 10, e.g., by means of a screw thread connection. Each module advantageously has the same external dimensions, such that, in the event of a change in the production process, the tunnel oven can be easily and quickly adapted, e.g., by replacing one module with another. Each module may be configured to carry out a specific treatment of the products. Each module advantageously comprises a support for the conveyor 11 , such that, if the oven is expanded to include additional modules, the conveyor can be easily adapted.

[0027] In the example of Fig. 1 and 2, the tunnel oven 10 is provided for sequential searing and marking of food products, preferably meat, fish, or vegetables. Thus, the tunnel oven 10 comprises two modules 16 and 17 that are arranged sequentially in the direction of the conveyor 1 1. It should be noted that the devices described herein are not limited to these two modules. Additional modules may be provided, or one of the two modules may be omitted without adversely affecting the scope of the invention. Although the tunnel oven 10 is presented as an advantageously modular oven, the devices described herein are not limited to such an embodiment.

[0028] The first module 16, provided for searing food products, comprises a first series of burners 161 , arranged above the conveyor 1 1 , such that their heat- radiating sides 163 are advantageously directed at the conveyor 1 1. A second series of burners 162 may advantageously be arranged below the conveyor 1 1. In this second series of burners 162, the heat-radiating sides 162 are advantageously also directed at the conveyor 11. Above the burners 162, a screen 164 may advantageously be provided in order to protect these burners 162 against any juices falling from the food products carried by the conveyor 1 1. This screen 164 advantageously has a V-shaped cross section, which is particularly suited for flame burners, e.g., metal fibre burners, that are used in blue flame mode, in order to distribute the flames along both sides of the V.

[0029] The second module 17, which is arranged along the direction of transport of conveyor 1 1 downstream module 16, comprises a burner 171 and a series of marking rings 172 arranged above the conveyor 1 1. The burner 171 is arranged to heat the marking rings 172. These marking rings 172 then roll over the food products being transported on the conveyor 1 1 , thus applying grill markings to the food products. The height of the marking rings 172 relative to the conveyor 11 can advantageously be adjusted by means of a lever 173 that engages with the axis of the marking rings 172 via a sprocket 174.

[0030] The conveyor 1 1 is advantageously a continuous or endless belt, which is advantageously porous and is made of a metal net, e.g. made of woven metal wire. The conveyor may be mounted in a fixed manner on the frame 104 of the oven 10 (this is the case in Fig. 2), or may be separate from it, e.g., by providing the conveyor with idlers. The conveyor 1 1 is advantageously attached between a drive pulley 11 1 and an idler pulley 112. The drive pulley 1 11 is driven by a motor 1 13 that advantageously is also able to drive the marking rings 172 via a drive belt 1 14. Carrier rods 115 may be provided in the tunnel oven 10 in order to support the conveyor belt 1 1. These carrier rods 115 are advantageously provided in each module 16, 17, and arranged in a fixed position relative to the frame 104 of the tunnel oven 10. Advantageously, a spray assembly 1 16 is provided in the return portion 1 10 of the conveyor 11 to cool and/or clean the conveyor 1 1.

[0031] Fig. 3 - 5 show the first module 16 separate from the oven 10 and without the conveyor 11. Module 16 advantageously comprises a module frame 165 that is advantageously affixed to the frame 104 of the oven 10. As mentioned above, the conveyor 1 1 , which is not shown, runs over carrier rods 1 15 that are attached to the module frame 165. Additionally, the module 16 comprises the top series of burners 161 and the bottom series of burners 162, which, in the position of Fig. 3 and 4, are arranged transversely to the direction of transport of the conveyor 1 1 between the first side wall 12 and the second side wall 13. The first side wall 12 is omitted here in order to show the inside of the module. This first side wall is advantageously formed by a wall panel 121 suspended on a hinge 166 of the module frame 165.

[0032] The burners 161 and 162 are arranged such that they are movable relative to the oven (the frame 104/ module frame 165) between two extreme positions. In a first extreme position 203, as shown in Fig. 3 and 4, the burners are arranged in the tunnel oven 10, such that they are operable to carry out the desired heat treatment. The entire burner, e.g. inclusive of the manifold chamber(s) in case of a metal fibre burner 30 as the one shown in Fig. 8, will advantageously be located within the oven space 15 in the first position 203. In a second extreme position 204, which is opposite the first extreme position, as shown in Fig. 5, the burners are arranged completely outside of the oven space 15. In this second position 204, the burners are not operational, and are advantageously easily accessible for maintenance or replacement.

[0033] The direction of movement between the first position 203 and the second position 204 runs advantageously, but not necessarily, transverse to the direction of the flow of products into the oven (e.g., transverse to the direction of transport of the conveyor 11). In such a case, in the second position, the burners are on an outer side of the side wall 13, i.e., the side of side wall 13 opposite the side that faces the side wall 12. Depending on the construction of the oven and the available space in the hall in which the oven is placed, it is alternatively possible to arrange the burners so as to be relatively movable in a direction parallel to the direction of movement of the products into and out of the oven (e.g., direction of transport of the conveyor 11). In such a case, in the second position, the burners are outside the oven space 15 along the intake side 101 or the outlet side 102. Of course, other directions of movement of the burners from the first to the second position, e.g., upward, are also possible.

[0034] The aforementioned relative movement of the burners is made possible by mounting the burners on separate guides, or a common guide 200. This guide 200 is advantageously assembled on the module frame 165, and runs in the example shown transverse to the direction of transport of the conveyor 1 1 , such that the burners are movable along a same direction relative to the module frame 165. Guide 200 is advantageously a linear guide that is advantageously lubricant-free. Guide 200 may, for example, be formed by guidance rods 201 that are affixed to the module frame 165 of the tunnel oven, and a slide that advantageously comprises one or more idlers 202 that run over rods 201. Alternatively, a rod mechanism, e.g., a parallelogram rod mechanism, may be used to guide the relative movement of the burners. In the latter case, the relative movement of the burners will not be linear.

[0035] In moving between the first and the second position, the burners move through an opening 131 , which, in the case of a transverse movement, is arranged in the second side wall 13. Advantageously, a cover plate 210 is provided at the end of the burners 161 , 162, opposite the opening 131. The cover plate moves with the burners, and is attached jointly with the burners to idlers 202. As shown in Fig. 5, this cover plate 210 covers the opening 131 completely when the burners are in the second extreme position. In the first extreme position, the cover plate 210 will be arranged in proximity of the first side wall 12 and not hinder operation.

[0036] A bellows 220, arranged on an outer side of the side wall 13, advantageously protects the burners when they are completely removed from the oven in the second extreme position. Bellows 220 is attached on one end with the second side wall 13 and on the other with a housing of a system 230 that will be described below. The bellows 220 is advantageously made of a heat-resistant material, e.g., polytetrafluoroethylene (PTFE).

[0037] With the burners in the second position, the oven can be thoroughly cleaned, even using high-pressure cleaners, without any risk of damaging the burners. Indeed, the burners 161 , 162 are outside of the oven space 15 and protected by the cover plates 210. In this second position, the burners are also easily accessible for maintenance or replacement. It suffices to remove the protective bellows 220.

[0038] A locking mechanism, e.g., a clamp 240, advantageously locks the burners in the first, operational, position. This prevents accidental removal of the burners during operation. Alternatively or additionally, other safety systems, e.g., a magnetic contact 241 , may be provided in order to detect the position of the burners, e.g., in the first operational position. Such safety systems may be connected to a controller 18 that shuts down the burners, e.g., by cutting off the gas supply, when the burners are not in the first position.

[0039] A system 230 for preparing a gas/air mixture for the burners 161 and 162 (premix) is advantageously arranged in a fixed position relative to the burners and thus moves integrally with the burners. The system 230 is advantageously arranged such that, in each position of the burner, it is located outside the oven space 15, e.g., by providing the system 230 at an end of the burners 161 , 162 opposite the cover plate 210. An ignition mechanism and ionisation sensor (not shown) may advantageously also be arranged in a fixed manner relative to the burners and move integrally with them. In order to absorb the weight of the burners and peripheral devices, such as system 230, an additional support, e.g., in the form of a support frame 250, may be provided outside the oven 10.

[0040] Fig. 6 and 7 show the second module 17 separate from the oven

10 and without the conveyor 11. In this case, the side wall 12 is visible and formed by a wall panel 122 that is advantageously suspended by a hinge on the module frame 175. In the second module 17, the burner 171 is arranged movably in the same way as the burners of the first module 16; more specifically, it is movable relative to the module frame 175. Just as with the module 16, the direction of movement is cross to the direction of transport of the conveyor 1 1 , but alternatives are possible according to various directions of movement, e.g., parallel to the direction of transport of the conveyor 11. Burner 171 is advantageously arranged on a guide 200, and can move between a first, operational, position, as shown in Fig. 6 and 7, and a second position (not shown), in which the burner 171 is outside the oven area 15. It should be noted that the marking rings 172 advantageously do not move with the burner 171 , so that they can be cleaned together with the oven space 15. In this module, too, a cover plate 210 is advantageously attached to the end of the burner 171 in order to close the opening through the side wall 13 in the second extreme position. The other components of the second module 17 are advantageously identical to those of the first module 16.

[0041] In Fig. 6 and 7, both side walls 12 and 13 are also shown.

According to an aspect of the devices described herein, each of the side walls is advantageously double-walled with an outer wall, 123, 133, respectively, and an inner wall, 124, 134, respectively, that are spaced apart from one another. The intermediate space may be filled with a thermally insulating material. Alternatively, the intermediate space 125, 135 forms an air cavity between the outer wall and the inner wall of each side wall, through which air can circulate. Referring to Fig. 2, the air cavity advantageously communicates with the exhaust line 141 , such that forced air circulation is accomplished through the air cavity. In this regard, the coverage 14 may also be double-walled, with an inner wall 142 and an outer wall 143 that are spaced apart from one another, such that an air duct is formed in the intermediate space 144. Such an arrangement advantageously allows for separate extraction of combustion gases from the oven space and of air from the air cavity 125, 135. In this way, the outer walls of the tunnel oven 10 can remain cool, and there is advantageously no need for thermal insulation, which saves costs.

[0042] The aforementioned aspects are also applicable to ovens with a non-continuous product transit, e.g., ovens with a shutter door, and/or ovens in which the support is a plate that is slid into the oven space and slid out of the oven on the same side after treatment.