Drying equipment for production of candy products

Abstract

Described is a drying apparatus (100) for producing confectionery products, comprising a drying chamber (3), an air handling unit (2), a delivery assembly (4) and a suction assembly (5), an internal air distribution assembly being fluidly connected to said delivery assembly (4) and said suction assembly (5), thereby forming a closed air circuit, characterized in that said air distribution assembly is fluidly connected to said delivery assembly (4) and said suction assembly (5). The internal distribution assembly comprises at least one closed-section conveying channel (7), and the closed-section conveying channel (7) comprises a plurality of main outlets (8) used for sending a part of the air flow to the lower portion of the drying chamber (8).

Description

Technical Field

[0001] The present invention relates to the field of equipment for the drying production of candy products. More specifically, the present invention relates to a drying equipment for producing candy products. Background Art

[0002] As is known, the production of confectionery products on an industrial scale, such as jelly, commonly known as "jelly", is achieved through a process of casting the product (still in a semi-liquid or viscous state) into receiving elements capable of ensuring that the product releases some of the moisture contained in the initial stage, but maintains a given shape and size, and a subsequent drying step of the product in a specific dryer.

[0003] Starch, silicone or plastic molds are generally used.

[0004] The preparation of the mixture allows for the candy to have a solid structure with softness and gloss given by a gelatin base, starch and gelatin or starch alone. Each specific recipe may include additives, sugars, water and other ingredients such as starch and different flavored berries.

[0005] In the production of gum, powder ingredients such as starch are usually used for molding. During the entire drying process, the molding process of the product is generated by the product and the product is still contained in it.

[0006] The production is carried out by molding the desired shape inside a starch-filled box, in which the shape printed in the powder element is the negative of the product. Subsequently, the product is cast therein in a semi-liquid or viscous form, which must undergo a drying process due to the high water content present at the end of mixing all the elements of a given recipe for each individual product.

[0007] After casting, the product is ready for drying, which is usually done by forced air convection in special tunnels or chambers.

[0008] The purpose of drying is to produce a solid matrix which must match the desired product specifications and in the case of jelly-like products this is achieved through a gelling process which takes place simultaneously with drying.

[0009] By filling the box with powdered elements, it is also possible to ensure easy removal of the dried sweets while preventing them from being destroyed by contact with solid surfaces, to which the product tends to stick.

[0010] Furthermore, the tray dispensing process, if automated, ensures that the formed candies can be easily replaced with new ones to be processed, thereby restarting the process.

[0011] Drying conditions for producing candies are product specific and may require different times due to the gelling process and the significant reduction in temperature and moisture inside the product.

[0012] The drying conditions also depend on the size of the confectionery product, its composition and the type of product to be obtained.

[0013] Typically, the tray filled with powder and the candy pieces deposited inside is placed in a conditioning chamber for about 12-72 hours. In this conditioning or drying chamber, the air flow used as a means of heat and mass exchange with the product is maintained at a temperature and humidity suitable to provide the product with the desired shape and properties.

[0014] The temperature and humidity conditions used are also used to ensure that the gelling process proceeds. This process creates a compact product. However, gum that has only undergone the latter process but has not been fully dried is generally considered unsuitable for further processing.

[0015] The shelf life of the candy is determined by the level of water activity it generates during the drying process. Drying also imparts a degree of toughness to the product, preventing it from cracking or breaking during the same handling steps.

[0016] The drying process takes place in special chambers or tunnels, where moisture is mainly extracted from the confectionery, which contains the powdered product, but also from the air that is pressed into the chamber, where its temperature and humidity are controlled.

[0017] At the end of the process in these chambers, the pellets are separated from the powdered product which serves as a container. During the process, the moisture content in the casting powder (starch) increases to a level that is unsuitable for immediate reuse. "Unsuitable" refers to elements whose functionality as a shaping agent and confectionery dehydration potential is lost or reduced to a level that is no longer acceptable.

[0018] The Applicant has therefore noted that in current drying devices, air parameters, such as temperature and humidity, are controlled, but the flow path of the air flow is not controlled.

[0019] The Applicant faced the problem of making a drying device which would overcome the problems of the prior art drying devices, in particular the controllability of the air flow into the chamber, in particular in terms of flow rate, speed and directionality within the drying chamber. Summary of the invention

[0020] Thus, in a first aspect of the invention, the invention relates to a drying device for producing confectionery products, the drying device comprising: a drying chamber having a longitudinal extent along a longitudinal axis and a transverse axis arranged substantially perpendicular to the longitudinal axis, an air handling unit, a conveying assembly and an intake assembly, an internal air distribution assembly being fluidly connected to the conveying assembly and the intake assembly to form a closed air circuit, characterized in that the internal distribution assembly comprises a distribution channel of at least one closed section. The distribution channel of at least one closed section comprises a plurality of main outlets, the main outlets being used to feed air into the upper part of the drying chamber and to send at least part of the fed air flow to the lower part of the drying chamber;

[0021] - the distribution channel extends in the upper part of the drying chamber over at least 70% of the longitudinal extent of the drying chamber;

[0022] - the suction assembly comprises an air suction hole arranged at the upper part of the drying chamber;

[0023] - said air intake openings are located away from said distribution channel in the direction of said transverse axis, so that said intake air flow from said distribution channel, once introduced into the upper part of said drying chamber and delivered mainly in the lower part of said drying chamber, passes through said drying chamber in the transverse direction and leaves said intake assembly). The Applicant has found that delivering the air flow into the drying chamber and drawing it from above the drying chamber, but in radially opposite positions along the longitudinal direction of the drying chamber, allows maximum freedom in loading / unloading the drying chamber by means of a forklift (in most cases self-propelled).

[0024] The air supply system is designed to produce downward (ground level) high velocity jets. This is to avoid blowing directly on the starch in the trays placed within the drying chamber, thereby avoiding spreading it into the drying chamber itself, but more importantly to avoid potentially hazardous (explosive) conditions.

[0025] The feeding of the stack of pallets exposed to these jets occurs indirectly due to the natural and progressive expansion of the air jets on their way down to the ground. Therefore, on average, the air flow follows the pressure gradient generated in the drying chamber, with maximum peaks on the delivery side at the floor, but minimum values ​​on the suction side at the height of the drying chamber roof.

[0026] The upper part of the suction chamber refers to the part which is more than 60% of the height of the drying chamber floor.

[0027] In the above aspects, the present invention may have at least one preferred feature described below.

[0028] Preferably, each main outlet has a diameter of 2000 mm. 2 Up to 6000mm 2 The plane area between.

[0029] The main outlets are conveniently evenly spaced across the distribution channel.

[0030] Advantageously, each of the main outlets comprises at least one first guide fin extending substantially vertically from the distribution channel and used to help guide the airflow toward the lower portion of the drying chamber; each of the first guide fins is arranged around the main outlet so as to at least partially wrap the first guide fin.

[0031] Preferably, each of the first guide fins is arranged around the main outlet so as not to completely surround the main outlet.

[0032] Conveniently, the distribution channel comprises a plurality of secondary outlets having a smaller plan area than the primary outlet; the secondary outlets being evenly spaced along the distribution channel.

[0033] Preferably, each auxiliary outlet has a diameter between 1500 and 5000 mm. 2 The plane area between.

[0034] Advantageously, each auxiliary outlet comprises at least one second guide fin.

[0035] Preferably, each of the second guide fins is arranged along an axis, the axis being adapted to form an acute angle α with a vertical line of 50° to 90°, including extreme values.

[0036] Conveniently, each second guide fin is arranged around the auxiliary outlet to completely surround it.

[0037] Advantageously, the distribution channel has a trapezoidal cross-section converging at the bottom.

[0038] Preferably, the distribution channel is arranged on a first side wall of the drying chamber; the suction opening of the suction assembly is arranged near a second side wall of the drying chamber; and the first side wall of the drying chamber faces the second side wall of the drying chamber.

[0039] Conveniently, the drying device according to the invention comprises at least one dark box comprising a plurality of seats for negatively regenerating the product to be manufactured, said at least one dark box comprising at least one spacing element configured to create a channel for the airflow, for example when a dark box is stacked with another dark box.

[0040] Advantageously, the drying device according to the invention comprises at least one stack of cassettes, said stack comprising a plurality of cassettes, said stack overlapping and spaced apart from one another by said spacing elements, thereby creating at least one channel for an air flow between cassettes and overlapping cassettes.

[0041] Further features and advantages of the present invention will become more apparent from the detailed description of some preferred but not exclusive embodiments of the drying apparatus for the production of confectionery products provided by the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] This description will be set forth herein in conjunction with the accompanying drawings, which are provided by way of example only and are therefore not limiting, in which:

[0043] - Figure 1 The overall block diagram of the process of the candy product production drying equipment is shown;

[0044] - Figure 2 A schematic perspective view of a drying chamber covered by a conveying assembly, an intake assembly and an air handling unit provided according to the present invention is shown;

[0045] - Figure 2a Shows Figure 2 A schematic cross-sectional view of a drying chamber, showing the direction of airflow;

[0046] - Figure 3 Shows Figure 2 A perspective view of an inhalation assembly;

[0047] - Figure 4 Shows Figure 2 A perspective view of an air handling unit;

[0048] - Figure 5 Shows Figure 2 A perspective view of a conveying assembly;

[0049] - Figure 6 an enlarged perspective view showing at least a portion of a dispensing channel of the present invention; and

[0050] - Figure 7a and Figure 7b A tray and a pallet are shown separately. DETAILED DESCRIPTION

[0051] With reference to the accompanying drawings, a drying apparatus for producing confectionery products, in particular gum candy, according to the present invention is indicated by reference numeral 100 .

[0052] Figure 2 , 2a shows a drying device 100 according to the present invention, including a drying chamber 3, an air handling unit 2, a conveying component 4 and an intake component 5.

[0053] The drying chamber 3 comprises a box-shaped body including insulating side walls in fluid communication with a delivery assembly 4 for delivering conditioned air into the chamber and a suction assembly 5 in fluid communication with the drying chamber 3 and in particular for extracting the air inside the drying chamber 3 .

[0054] The drying chamber 3 extends along a longitudinal extent XX axis and has a transverse ZZ axis arranged substantially orthogonally to the longitudinal XX axis.

[0055] The air handling unit 2 is used to subject the air flow to at least the following cooling and dehumidification treatments, wherein condensed water is recovered and separated from the air flow, heated to a temperature specified by the recipe of the product to be treated, and pressure increase is achieved by means of a specific fan.

[0056] Possibly, the treatment unit 2 can be used to implement other processes on the air flow, such as flowing a portion of the effluent from the drying chamber in order to replenish it under more favorable temperature and humidity conditions, i.e. once mixed with the main air flow, the treatment unit 2 brings the temperature and humidity to better values ​​for subsequent processing.

[0057] To this end, the treatment unit 2 comprises at least one first exchanger for cooling the air, at least one droplet separator, at least one second exchanger for heating the air flow and at least one fan for increasing the pressure of the air flow.

[0058] like Figure 5 As best shown, the delivery assembly includes an internal air distribution assembly 6 fluidly connected to the delivery assembly 4 and the suction assembly 5 to form a closed air circuit.

[0059] The internal air distribution assembly 6 includes a portion disposed outside the drying chamber 3 and a distribution channel 7 disposed inside the drying chamber 3 .

[0060] Preferably, the distribution channel 7 extends at least 70% of the longitudinal extent of the drying chamber 3 in the upper part of the drying chamber 3. In the embodiment shown in the figures, the distribution channel 7 is limited to the ceiling of the drying chamber 3, in particular, it is located at the corner between the side wall 3a and the ceiling 3b of the drying chamber 3.

[0061] Preferably, the distribution channel 7 extends over the entire longitudinal extent of the drying chamber 3 .

[0062] The distribution channel 7 has an air inlet from the conveying assembly.

[0063] The air inlet opening is usually placed in a central position, ie at about 50% of the total extent of the distribution channel 7 .

[0064] The distribution channel 7 has a closed section.

[0065] The distribution channel 7 has a trapezoidal cross section, with the small base of the trapezoid facing downward, ie, toward the interior of the drying chamber 3, so as to increase the pressure of the air flowing downward.

[0066] Preferably, the cross-sectional shape of the distribution channel 7 is a right trapezoid oriented vertically on the right side, ie, according to the vertical side wall 3 a of the drying chamber 3 .

[0067] In order to properly deliver the airflow within the drying chamber 3, the distribution channel 7 has suitable air outlets and systems suitable for directing the airflow, as will be described in more detail below. Here, the shape, size and number of the outlet portions of the openings on the distribution channel 7 also allow managing the maximum flow rate value in the chamber, wherein a certain flow rate threshold does not need to be exceeded inside the drying chamber itself.

[0068] The distribution channel 7 thus has a plurality of main outlets 8 placed on a small base of a trapezoid.

[0069] Therefore, the main outlet 8 is also located in the upper part of the drying chamber and close to the side wall 3 a of the drying chamber 3 .

[0070] There are no additional main outlets located at different positions of the drying chamber 3 .

[0071] The main outlet 8 is responsible for delivering a part of the air flow directly to the lower part of the drying chamber 3.

[0072] The main outlet 8 has a rectangular planar cross section, but may have a cross section of a different shape without departing from the scope of protection of the present invention.

[0073] Preferably, along the distribution channel 7 the main outlets 8 all have the same shape.

[0074] Each main outlet 8 has a width between 2000 mm 2 Up to 6000mm 2 The main outlets 8 are evenly spaced apart on the distribution channel 7 .

[0075] Preferably, the main outlets 8 are arranged at a mutual distance from their centre of symmetry of between 250 and 500 mm, extreme values ​​included.

[0076] In the embodiment shown in the figures, each main outlet 8 comprises at least one first guide fin 9 for guiding the air flow to the lower part of the drying chamber 3 .

[0077] Each first guide fin 9 extends substantially vertically by at least 5 cm, more preferably by 10 cm, even more preferably by 20 cm.

[0078] In the embodiment shown in the figures, each first guide fin 9 is arranged around the main outlet so as to at least partially surround the main outlet.

[0079] Each first guide fin 9 is disposed around the main outlet 8 so as not to be completely wrapped.

[0080] The thickness of each first guide fin 9 is between 0.5 and 3 cm.

[0081] In the embodiment shown in the figures, each first guide fin 9 is arranged in a plane according to a C-shaped profile along the periphery of the main outlet 8 .

[0082] Alternatively, each first guide fin 9 may be arranged in a plane according to different cross-sections, but still along the periphery of the main outlet 8 without departing from the protection scope of the present invention.

[0083] In order to convey part of the air flow to the upper region of the drying chamber 3 , the distribution channel 7 has a secondary outlet 10 .

[0084] The auxiliary outlet 10 has a smaller plane area than the main outlet 8 .

[0085] The distribution channel 7 has a plurality of auxiliary outlets 10 disposed on the inclined surface of the trapezoid.

[0086] Preferably, all secondary outlets 10 have the same shape along the distribution channel 7 .

[0087] The plane area of ​​each auxiliary outlet 10 is between 1500 and 5000 mm 2 between.

[0088] The secondary outlets 10 are evenly spaced apart on the distribution channel 7 .

[0089] Preferably, the secondary outlets 10 are arranged at a mutual distance from their centre of symmetry of between 400 and 1000 mm, extreme values ​​included.

[0090] The secondary outlets 10 are spaced apart from one another at a greater distance than the mutual distance of the primary outlets 8 , so that the distribution along the distribution channel 7 is more sparse compared to the primary outlets 8 .

[0091] In the embodiment shown in the figures, each auxiliary outlet 10 includes at least one second guide fin 11 .

[0092] Each first guide fin 9 extends substantially vertically by at least 5 cm, more preferably by 10 cm, even more preferably by 20 cm.

[0093] Each second guide fin 11 extends substantially for at least 5 cm, more preferably 10 cm, even more preferably 20 cm.

[0094] Each second guide fin is arranged along an axis, and the axis is adapted to form an acute angle α of 50° to 90° with the vertical, including extreme values.

[0095] In the embodiment shown in the figure, each second guide fin 11 is arranged around the auxiliary outlet to completely surround it.

[0096] The thickness of each second guide fin 11 is between 0.5 cm and 3 cm.

[0097] In the embodiment shown in the figures, each second guide fin 11 is arranged in a plane along the periphery of the auxiliary outlet 10 .

[0098] The introduction of the auxiliary outlet 10 in combination with the second guide fin 11 on the distribution channel 7 significantly improves the uniformity of the airflow in the drying chamber, better controls the maximum velocity achieved by the airflow, and simultaneously increases the total flow rate within the cycle, thereby obtaining all the associated benefits.

[0099] according to Figure 3 In the illustrated embodiment, the suction assembly 5 includes an air suction hole disposed at the upper portion of the drying chamber 3 .

[0100] The air intake hole is away from the distribution channel 7, especially away from its main outlet 8, in the transverse ZZ axis direction, so that the air intake from the distribution channel 7 to the drying chamber, once sent into the upper part of the drying chamber 3 and sent to the lower part of the drying chamber 3, passes through the drying chamber and leaves the drying chamber through the intake assembly. In particular, the air flow flows out of the drying chamber 3 through the intake hole 12.

[0101] As better explained below, the air flow introduced into the drying chamber moves from the wall 3 a of the drying chamber to the opposite surface via a path with as little turbulence as possible and then flows out of the drying chamber 3 through the suction opening 12 .

[0102] In the drying chamber, the products to be dried are brought into special trays 15 and are appropriately stacked on the special trays 15 to form a stack.

[0103] Each tray 15 comprises a plurality of seats that negatively reproduce the product to be manufactured and at least one spacing element 19 for creating a channel 20 for the air flow when a cassette 15 is stacked with additional cassettes 15 .

[0104] exist Figure 7b In FIG. 1 , a stack of cassettes is shown, comprising a plurality of cassettes 15 which are stacked and spaced apart from each other by spacing elements 19, thereby creating at least one channel 20 for air flow between cassettes and stacked cassettes.

[0105] In the following we will describe the general production cycle of gummies, starting with the introduction in the drying chamber 7 of the cassette 15 coming from the casting system containing the product to be dried (not shown in the drawings).

[0106] In the casting system, the casting step is implemented as follows: after filling with the powder, the dark box 15 or tray that has been pre-embossed with the negative print of the product moves to the actual casting of the product that is impressed in the powder, casting the product mixture in liquid or viscous form in precise doses in each mold. Once the dark box 15 is filled with these two elements, it is usually sent to the stacking assembly.

[0107] Typically, a stacking assembly (also not shown in the figures) is automated and is used to stack the cassettes 15 on top of each other, thereby creating a stack of a well-defined number of cassettes.

[0108] The cassettes 15 are stacked in a stack such that, due to the spacing elements 19, a channel 20 for the air flow is formed between one cassette and the cassette beneath it.

[0109] The number of cassettes per stack 16 can vary depending on various parameters, such as the throughput per cycle, the height of the internal chamber and ventilation system, the type of product, etc.

[0110] The stacks 16 are divided into 2 or 3 stacks and stored on bases, usually called pallets 18 , to facilitate handling from these casting and stacking stations to the inside of the drying chamber 3 .

[0111] Once the pallet 18 is ready for handling, it is loaded and inserted into the drying chamber 3 by the means used to move the material.

[0112] Each pallet 18 stored in each drying chamber 3 has a precise position that must be respected in order to allow for proper air circulation inside it. Incorrect positioning can lead to an unbalanced air circulation inside the drying chamber 3, once circulation is started on a misplaced pallet 18 and on adjacent pallets. This results in poor product quality distribution and / or longer process times.

[0113] Associated with both of these consequences is economic deterioration.

[0114] After all the pallets 18 are placed in the drying chamber 3, the drying cycle can begin. The length of the cycle depends on the type of product to be processed, the well-defined recipe for the product type, and the energy efficiency of the process.

[0115] During the drying cycle, the air, acting as an energy carrier, is first processed by continuous circulation through air treatment units 2, and then sent and distributed inside the drying chambers 3. The air inside these treatment units 2 generally undergoes a series of very specific processes that may vary during the cycle, depending on the point of progress of the cycle itself and on the specific operating point specified in the treatment recipe of the product being dried within a given cycle. In general, the processes of cooling and dehumidifying the air consist of: cooling and dehumidifying, in which the condensed water is recovered and separated from the air flow, heating to the temperature specified by the recipe of the product being treated, and increasing the pressure, achieved by specific fans. To these processes, other methods may also be added, such as the discharge of a portion of the effluent from the chamber in order to make up for it under more favorable conditions of temperature and humidity, i.e. to bring the temperature and humidity to better values ​​for subsequent treatment, once they are mixed with the main flow.

[0116] Once the air leaves the treatment unit 2, it will have the temperature, humidity and pressure values ​​required for that point in the cycle. The temperature and humidity will be exchanged with the treated product in order to dry it, more specifically by releasing heat and removing moisture, while the pressure energy will be consumed by the path the air must take from the conveying assembly 4, through the duct and throughout the drying chamber 3 until it returns to the same starting point, the cycle being closed or semi-closed.

[0117] Once the air reaches the drying chamber 3, it must not only have the correct temperature and humidity values ​​specific to the current cycle and the state of progress of the cycle itself, but also must have sufficient kinetic and pressure energy to adapt to the channel gaps between each dark box on each pallet 18 at each point in the drying chamber 3.

[0118] It is therefore obvious how important it is to have an optimal three-dimensional distribution of the flow throughout the drying chamber 3. More specifically, a better distribution of the airflow leads directly to at least two main effects: firstly, the airflow processed by the fan has to circulate through a lower pressure drop, which reduces the energy consumption of the fan; secondly, during the drying cycle, by better distributing the energy supply provided to the product at each point in the drying chamber, i.e. from the point of view of the air handling system, the consumption will be reduced and the cycle time can be reduced, which will be further advantageous from an energy point of view.

[0119] In order to make the flow in the drying chamber 3 have a high three-dimensional distribution, the air flow is fed into the upper part of the drying chamber 3 through the main outlet 8 and the auxiliary outlet 10 .

[0120] After entering the drying chamber 3, it is pushed downward toward the floor of the drying chamber 3.

[0121] Part of the air flow flowing between the side wall 3a and the stack reaches the floor of the drying chamber 3 and, once hitting the floor, turns around according to a transverse axis to pass through the drying chamber 3 and reaches the opposite side wall.

[0122] Once reaching the opposite side wall 3 a of the drying chamber 3 , the airflow rises, is caught by the suction holes 12 of the suction assembly, and flows out of the drying chamber 3 .

[0123] A portion of the downwardly pushed airflow sneaks between the channels 20 of the stacked cassettes 15 to laterally pass through the drying chamber 3 and then rejoins with the rest of the airflow rising at the remaining side walls 3a.

[0124] The invention allows to increase and improve simultaneously the air flow rate fed into the drying chamber and its distribution within the volume of the drying chamber and therefore within the cassettes 15 contained therein during the common cycle. In other words, it makes it possible to increase the average velocity of the flow inside the drying chamber, favouring the convection processes of heat and mass exchange, while reducing the diffusion of the product mass due to a better distribution of the flow.

[0125] The greater the benefit brought by the invention, the higher the restrictions related to the maximum speed achievable within the drying chamber. In general, starch-free applications are those where the greatest performance gain and greatest energy efficiency of the system are achieved.

[0126] Several modifications may be made to the embodiments described in detail, all remaining within the scope of protection of the invention as defined by the following claims.

Claims

1. A drying device (100) comprising a drying chamber (3) having a longitudinal extent along a longitudinal axis (XX) and a transverse axis (ZZ) arranged substantially perpendicular to said longitudinal axis, an air handling unit (2), a conveying assembly (4) and an intake assembly (5), an internal air distribution assembly being fluidly connected to said conveying assembly (4) and said intake assembly (5) so as to form a closed air circuit, characterized in that The internal distribution assembly comprises at least one closed section distribution channel (7), the at least one closed section distribution channel (7) comprising a plurality of main outlets (8), the main outlets (8) being used to deliver air into the upper part of the drying chamber (3) and to deliver at least part of the inlet air flow into the lower part of the drying chamber (3); - the distribution channel (7) extends in the upper part of the drying chamber (3) over at least 70% of the longitudinal extent of the drying chamber (3); - the suction assembly (5) comprises an air suction hole arranged in the upper part of the drying chamber (3); - The air intake hole is away from the distribution channel (7) in the direction of the transverse axis, so that once the intake air flow from the distribution channel (7) is input into the upper part of the drying chamber (3) and is mainly sent out in the lower part of the drying chamber (3), the intake air flow passes through the drying chamber (3) in the transverse direction and leaves the intake assembly (5).

2. The drying device (100) according to claim 1, characterized in that: Each main outlet (8) has a width between 2000 mm 2 and 6000mm 2 The plane area between.

3. The drying device (100) according to claim 1, characterized in that: The main outlets (8) are evenly spaced apart on the distribution channel (7).

4. The drying device (100) according to claim 1, characterized in that: Each of the main outlets (8) comprises at least one first guide fin (9) extending substantially vertically from the distribution channel (7) for guiding the airflow toward the lower part of the drying chamber (3); each first guide fin (9) is arranged around the main outlet (8) so as to at least partially wrap it.

5. The drying device (100) according to claim 4, characterized in that: Each first guide fin (9) is arranged around the main outlet (8) so as not to completely surround it.

6. The drying device (100) according to any one of the preceding claims 1 to 5, characterized in that The distribution channel (7) comprises a plurality of auxiliary outlets (10) having a plan area smaller than the main outlet (8); the auxiliary outlets (10) are evenly spaced along the distribution channel (7).

7. The drying device (100) according to claim 6, characterized in that: Each auxiliary outlet (10) has a width between 1500 mm 2 Up to 5000mm 2 The plane area between.

8. The drying device (10) according to claim 6 or 7, characterized in that: Each of the auxiliary outlets (10) comprises at least one second guide fin (11).

9. The drying device (100) according to claim 8, characterized in that: Each of the second guide fins (11) is arranged according to an axis adapted to form an acute angle α with the vertical line of 50° to 90°, including extreme values.

10. The drying device (100) according to claim 8 or 9, characterized in that: Each of the second guide fins (11) is arranged around the auxiliary outlet (10) to completely surround the auxiliary outlet (10).

11. The drying device (10) according to claim 1, characterized in that: The distribution channel (7) has a downwardly converging trapezoidal shape in cross section.

12. The drying device (10) according to claim 1, characterized in that The distribution channel (7) is arranged on the first side wall (3a) of the drying chamber (3); the suction assembly (5) is arranged on the second side wall (3a) of the drying chamber (3); the first side wall (3a) of the drying chamber (3) faces the second side wall (3a) of the drying chamber (3).

13. The drying device (10) according to claim 1, characterized in that The drying device (10) comprises at least one dark box (15), which comprises a plurality of seats for negatively regenerating the product to be manufactured, and at least one dark box (15) comprises at least one spacing element, which is used to create a channel for the airflow when one dark box (15) is stacked with another dark box (15).

14. The drying device (10) according to claim 13, characterized in that The drying device (10) comprises at least one stack of dark boxes, the stack of dark boxes comprising a plurality of dark boxes (15), the plurality of dark boxes (15) overlapping and spaced apart from each other by the spacing element so as to create at least one channel for air flow between the dark box (15) and the dark box stacked thereon.

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