A printing press oven

Abstract

This utility model relates to the technical field of gravure printing machines, and discloses a printing machine oven, including a bottom oven and an outer oven. The bottom oven is located below the outer oven, and the bottom oven and outer oven are arranged to move relative to each other. The edges of the opposite surfaces of the bottom oven and outer oven are sealed together. A feed roller is connected to the side of the bottom oven facing the outer oven, and a feed channel is formed between the bottom oven and the outer oven. The lower end of the feed channel has an inlet, and the upper end has an outlet. When the bottom oven and outer oven are sealed together, the feed roller is located inside the feed channel. A hot air outlet is provided on the side of the outer oven facing the feed channel. The feed channel includes a drying main area and an extension area. The extension area protrudes from the drying main area on the side facing the bottom oven. The outlet is located at one end of the extension area, and the other end of the extension area is connected to one end of the drying main area. The inlet is located at the other end of the drying main area. This utility model of a printing machine oven improves the drying efficiency of the oven.

Description

Technical Field

[0001] This utility model relates to the technical field of gravure printing machines, and in particular to a printing machine drying oven. Background Technology

[0002] According to the process requirements of gravure printing, ink adheres to the indentations on the gravure cylinder and is transferred to a flexible substrate by the printing pressure of the impression cylinder, for use in flexible packaging of various items. During the printing process, the drying oven, including an inner and outer oven, forms a relatively sealed drying space, which removes the water and solvent from the ink printed on the flexible printing substrate, while simultaneously drying the pigment resin in the ink and allowing it to solidify on the printing material.

[0003] Gravure printing presses have been widely used and developed in China over the past thirty years. However, with societal progress, the requirements for energy conservation and VOC emissions in gravure printing technology are becoming increasingly stringent. To reduce VOC emissions, the domestic gravure flexible packaging printing industry has introduced water-based inks, where the diluent consists of either water and alcohol or only water. However, water-based ink printing consumes more energy than traditional gravure printing presses. One of the most important methods to reduce the high energy consumption of gravure printing presses when using water-based inks is to improve the drying efficiency of their ovens. Utility Model Content

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. It provides a printing press drying oven that improves the drying efficiency of the oven.

[0005] To achieve the above objectives, this utility model provides a printing press oven, including a bottom oven and an outer oven. The bottom oven is located below the outer oven, and the bottom oven and the outer oven are arranged to move relative to each other. The edges of the opposite surfaces of the bottom oven and the outer oven are sealed together. A feed roller is connected to the side of the bottom oven facing the outer oven. A feed channel is formed between the bottom oven and the outer oven. The lower end of the feed channel has a feed inlet, and the upper end has a discharge outlet. When the bottom oven and the outer oven are sealed together, the feed roller is located inside the feed channel. A hot air outlet is provided on the side of the outer oven facing the feed channel.

[0006] The material passage includes a drying main area and an extension area. The extension area protrudes from the drying main area on one side facing the bottom drying oven. The discharge port is located at one end of the extension area, and the other end of the extension area is connected to one end of the drying main area. The inlet is located at the other end of the drying main area.

[0007] As a preferred embodiment, the printing press oven has intersecting first and second directions, the opening direction of the discharge port is set along the first direction, the hot air outlet includes an extended air outlet, the position of the extended air outlet corresponds to the extended area, and the opening direction of the extended air outlet is set along the second direction.

[0008] As a preferred embodiment, the outer oven includes an outer box, an inner box, a main air outlet plate, and an extended air outlet plate. The opening of the outer box faces the bottom oven. The inner box is connected to the outer box. A return air channel is formed between the inner wall of the outer box and the outer wall of the inner box. The return air channel is connected to the material passage. The outer box has a connection port and an air outlet. The inner box has a hot air chamber and an air inlet that are connected to each other. The outer box is connected to an air inlet pipe and an air outlet pipe. The air inlet pipe passes through the connection port and is connected to the air inlet. The air outlet pipe is connected to the air outlet and is connected to the return air channel.

[0009] The edge of the bottom oven is sealed to the edge of the outer box. The inner box has an inner box connection port on the side facing the bottom oven. The main air outlet plate and the extended air outlet plate are respectively connected to the inner box connection port. The extended air outlet plate is connected to the upper end of the main air outlet plate. The extended air outlet hole is set on the extended air outlet plate. The hot air outlet also includes a main air outlet hole, which is set on the main air outlet plate. The extended air outlet hole and the main air outlet hole are respectively connected to the material passage and the hot air chamber.

[0010] As a preferred embodiment, the main air outlet plate includes a plurality of first mesh plates connected to the inner casing. The plurality of first mesh plates are connected at intervals along the second direction, and an air knife is formed between adjacent first mesh plates. The first mesh plates are provided with air outlet mesh holes 33. The main air outlet includes the air knife and the air outlet mesh holes.

[0011] As a preferred embodiment, the air knife extends in the same direction as the material conveying roller.

[0012] As a preferred embodiment, multiple air knives and multiple first mesh plates are provided, and the air knives and the first mesh plates are spaced apart along the extension direction of the material passage.

[0013] As a preferred embodiment, the main air outlet plate is positioned corresponding to the drying main body area, and the position of the extended air outlet plate is positioned corresponding to the position of the extended area.

[0014] As a preferred embodiment, the length 'a' of the extended air outlet plate in the first direction is set to 0.5m-0.8m.

[0015] As a preferred embodiment, the main air outlet plate is connected to a return air duct, the return air duct is located inside the hot air chamber, one end of the return air duct is connected to the material passage, the other end is connected to the return air passage, and the return air duct extends along the first direction.

[0016] As a preferred embodiment, the main air outlet plate is connected to a guide plate, and the guide plate is located inside the hot air cavity.

[0017] Compared with the prior art, the advantages of this invention's printing press oven are as follows: the bottom oven and the outer oven can move relative to each other. During hot drying, the bottom oven moves towards the outer oven, and the edge of the bottom oven seals with the edge of the outer oven. A material passage is formed between the bottom oven and the outer oven. The printing material is fed into the material passage from the inlet for hot drying and then discharged from the outlet after drying. A hot air outlet is provided on the side of the outer oven facing the material passage. Hot air from the outer oven is blown out through the hot air outlet to the material passage to dry the material within the material passage. The material passage includes a drying main area and an extension area. The extension area protrudes from the drying main area on the side facing the bottom oven. The printing material first passes through the drying main area for preliminary drying, and then enters the extension area. The extension area extends the effective drying length at the outlet and expands the drying area in the outlet direction, allowing the hot air to cover a longer area and improving drying efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model.

[0019] Figure 2 This is a schematic diagram of the structure of the bottom drying oven according to an embodiment of this utility model.

[0020] Figure 3 This is a schematic diagram of the structure of the external drying oven according to an embodiment of this utility model.

[0021] Figure 4 This is a schematic diagram of the hot air flow path in the side direction of the overall structure of the embodiment of this utility model.

[0022] Figure 5 This is a schematic diagram of the hot air flow path in the front view of the overall structure of this utility model embodiment.

[0023] Figure 6 This is a schematic diagram of the structure of the air outlet mesh in an embodiment of this utility model.

[0024] Figure 7 This is a schematic diagram of the structure of the bottom oven and the outer oven when they are separated according to an embodiment of this utility model.

[0025] In the picture:

[0026] 10. Bottom drying oven; 11. Feed roller; 12. Feed channel; 13. Main drying area; 14. Extension area; 15. Feed inlet; 16. Discharge outlet;

[0027] 20. External oven; 21. Hot air outlet; 22. Return air duct; 23. Outer casing; 24. Connection port; 25. Air outlet; 26. Inner casing; 27. Inner casing connection port; 28. Hot air chamber; 29. ​​Air inlet; 30. Main air outlet plate; 31. Main air outlet hole; 33. Air outlet mesh; 34. First mesh plate; 35. Air knife; 36. Extended air outlet plate; 37. Air inlet pipe; 38. Air outlet pipe; 39. Return air pipe; 40. Guide plate; 41. Extended air outlet hole; 42. Connecting column;

[0028] 50. Printing materials; 51. Wall panels; 52. Guide rails;

[0029] X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0030] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0031] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" used to indicate the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0032] In the description of this utility model, it should be understood that the terms "connected," "linked," and "fixed," etc., used in this utility model should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or a welded connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly defined. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] like Figures 1 to 7As shown, a preferred embodiment of the present invention provides a printing press oven, comprising a bottom oven 10 and an outer oven 20. The bottom oven 10 is located below the outer oven 20, and the bottom oven 10 and the outer oven 20 are arranged to move relative to each other. The edges of the opposite surfaces of the bottom oven 10 and the outer oven 20 are sealed together. A feed roller 11 is connected to the side of the bottom oven 10 facing the outer oven 20. A feed channel 12 is formed between the bottom oven 10 and the outer oven 20. The lower end of the feed channel 12 is provided with an inlet 15, and the upper end is provided with an outlet 16. When the bottom oven 10 and the outer oven 20 are sealed together, the feed roller 11 is located inside the feed channel 12. The side of the outer oven 20 facing the feed channel 12 is provided with a hot air outlet 21.

[0034] The material passage 12 includes a drying main area 13 and an extension area 14. The extension area 14 protrudes from the drying main area 13 on the side facing the bottom drying oven 10. The discharge port 16 is located at one end of the extension area 14, and the other end of the extension area 14 is connected to one end of the drying main area 13. The inlet 15 is located at the other end of the drying main area 13.

[0035] The printing press oven of this invention has a bottom oven 10 and an outer oven 20 that can move relative to each other. During heat drying, the bottom oven 10 moves toward the outer oven 20, and the edge of the bottom oven 10 seals with the edge of the outer oven 20. A material passage 12 is formed between the bottom oven 10 and the outer oven 20. The printing material 50 is fed into the material passage 12 from the feed inlet 15 for heat drying, and then discharged from the discharge outlet 16 after drying. A hot air outlet 21 is provided on the side of the outer oven 20 facing the material passage 12. The hot air from the outer oven 20 is blown out through the hot air outlet 21 into the material passage 12 to dry the material in the material passage 12. The material passage 12 includes a drying main area 13 and an extension area 14. The extension area 14 protrudes from the drying main area 13 on the side facing the bottom oven 10. The printing material 50 first passes through the drying main area 13 for preliminary drying, and then enters the extension area 14. The extension area 14 can extend the effective drying length at the outlet 16 and expand the drying area in the outlet direction, so that the hot air can cover a longer drying area and improve the drying efficiency.

[0036] As one embodiment, such as Figures 1 to 3As shown, the bottom oven 10 of the printing press is fixed to the printing press wall panel, and the outer oven 20 is suspended on a movable guide rail installed on the printing press wall panel. The outer oven 20 moves relative to the bottom oven 10, and the cylinder pushes the outer oven 20 to engage and disengage with the bottom oven 10. When printing material 50 needs to be fed, the cylinder pushes the outer oven 20 open. When the printing material 50 is fed, i.e., the printing material 50 is flatly attached to the feed roller 11, the cylinder pulls the outer oven 20 back to seal it. Both the bottom oven 10 and the outer oven 20 need to be insulated. At the same time, in order to seal the bottom oven 10 and the outer oven 20, heat-resistant sealing material is pasted at the sealing points. After the bottom oven 10 and the outer oven 20 are sealed, the whole becomes a relatively sealed box, with only a very small gap at the discharge port 16 and the feed port 15. The bottom oven 10 is lower than the outer oven 20. The outlet 16 of the printing material 50 is the sealing point between the bottom oven 10 and the outer oven 20. When the bottom oven 10 and the outer oven 20 are separated, it is convenient for the printing material 50 to pass through.

[0037] Furthermore, such as Figures 1 to 3 As shown, the printing press oven has intersecting first direction X and second direction Y. The opening direction of the discharge port 16 is set along the first direction X. The hot air outlet 21 includes an extended air outlet 41, which is positioned corresponding to the extension area 14. The opening direction of the extended air outlet 41 is set along the second direction Y. Since the directions of the discharge port 16 and the extended air outlet 41 intersect, the extended air outlet 41 in the extension area 14 forms an air knife 35 at the discharge port 16. The extended air outlet 41 blows out a high-speed airflow, which confines the hot air in the oven to the material passage 12, reducing the overflow of hot air, reducing heat loss, and improving heat utilization.

[0038] Furthermore, such as Figures 1 to 3 As shown, the outer oven 20 includes an outer box 23, an inner box 26, a main air outlet 30, and an extended air outlet 36. The opening of the outer box 23 faces the bottom oven 10. The inner box 26 is connected to the outer box 23. A return air channel 22 is formed between the inner wall of the outer box 23 and the outer wall of the inner box 26. The return air channel 22 is connected to the material passage 12. The outer box 23 is provided with a connection port 24 and an air outlet 25. The inner box 26 is provided with a hot air chamber 28 and an air inlet 29 that are connected to each other. The outer box 23 is connected with an air inlet pipe 37 and an air outlet pipe 38. The air inlet pipe 37 passes through the connection port 24 and is connected to the air inlet 29. The air outlet pipe 38 is connected to the air outlet 25 and is connected to the return air channel 22.

[0039] The edge of the bottom oven 10 is sealed to the edge of the outer box 23. The inner box 26 is provided with an inner box connection port 27 on the side facing the bottom oven 10. The main air outlet plate 30 and the extended air outlet plate 36 are respectively connected to the inner box connection port 27. The extended air outlet plate 36 is connected to the upper end of the main air outlet plate 30. The extended air outlet 41 is provided on the extended air outlet plate 36. The main air outlet plate 30 is provided with a main air outlet 31. The extended air outlet 41 and the main air outlet 31 are respectively connected to the material passage 12 and the hot air chamber 28.

[0040] The inner chamber 26 is housed within the outer chamber 23, forming a return air channel 22 between them. The outer chamber 23 has a connection port 24 and an air outlet 25. The inner chamber 26 has a hot air chamber 28 and an air inlet 29. The connection port 24 is connected to an air inlet pipe 37, which communicates with the air inlet 29. Hot air enters the hot air chamber 28 through the air inlet pipe 37. The inner chamber 26 has an inner chamber connection port 27 on the side facing the bottom oven 10. The main air outlet plate 30 and the extended air outlet plate 36 are respectively connected to the inner chamber connection port 27. Hole 41 is provided on the extended air outlet plate 36, and the main air outlet plate 30 is provided with a main air outlet 31. The hot air in the hot air chamber 28 enters the material passage 12 through the main air outlet 31 and the extended air outlet 41 respectively. The material passage 12 is connected to the return air passage 22. The hot air in the material passage 12 is discharged from the air outlet 25 through the return air passage 22. Then, the air inlet 29, the hot air chamber 28, the hot air outlet 21 and the material passage 12 are connected to form the hot air inlet passage, and the material passage 12, the return air passage 22 and the air outlet 25 are connected to form the hot air outlet passage.

[0041] As one embodiment, such as Figures 1 to 3 As shown, the outer casing 23 is sealed except for the opening, connection port 24 and air outlet 25 on the side facing the bottom oven 10.

[0042] In one embodiment, a connecting column is provided between the outer casing 23 and the inner casing 26. The connecting column is located in the return air duct 22. One end of the connecting column is connected to the inner wall of the outer casing 23, and the other end of the connecting column is connected to the outer wall of the inner casing 26, thereby realizing the connection and fixation between the outer casing 23 and the inner casing 26.

[0043] In one embodiment, the air inlet 29 is located above the air outlet 25, thereby ensuring that the moisture content of the upper hot air is minimized and will not be affected by the high moisture content of the return air, which is conducive to complete drying.

[0044] Furthermore, such as Figure 3As shown, the main air outlet plate 30 includes multiple first mesh plates 34 connected to the inner box 26. The multiple first mesh plates 34 are connected at intervals along the second direction Y. An air knife 35 is formed between adjacent first mesh plates 34. The first mesh plates are provided with air outlet mesh holes 33. The main air outlet 31 includes air outlet mesh holes 33 and air knife 35. When drying the printing material 50 in the oven, the hot air passes through the narrow gap air knife 35 and blows towards the material passage 12 through the air outlet mesh holes 33. Then, under a certain wind speed and a certain wind pressure, it directly impacts the printing material 50 for heat transfer and drying, so that the printing ink dries and the drying efficiency is improved.

[0045] As one embodiment, the inner chamber 26 includes five closed surfaces and a main air outlet plate. The five closed surfaces are connected to form a frame. The frame is connected to the edge of the main air outlet plate 30 to form the inner chamber 26. Only the main air outlet plate 30 on the side facing the bottom oven 10 can be ventilated.

[0046] As one embodiment, such as Figure 3 and Figure 5 As shown, the air knife 35 is a long slit structure, consisting of two square or round metal strips, with the slit in the middle forming the air knife 35.

[0047] In one embodiment, the hot air flowing out of the air knife 35 is directly and vertically blown onto the feed roller 11, and the number of such air knives is the same as the corresponding feed roller 11.

[0048] As one embodiment, multiple air outlet mesh holes 33 are provided, and the air outlet mesh holes 33 are evenly opened on the first mesh plate 34.

[0049] As one embodiment, such as Figure 5 As shown, multiple rows of air outlet meshes 33 are spaced apart in the second direction Y, and the air outlet meshes 33 of adjacent rows are staggered along the second direction Y to improve the uniformity of air outlet in the inner box 26.

[0050] In one embodiment, the air outlet mesh 33 in the first mesh plate 34 and the extended air outlet hole 41 in the extended air outlet plate 36 are formed by a punching process. The air outlet mesh 33 and the extended air outlet hole 41 face the material passage 12 on the outside and face the hot air cavity 28 on the inside. The opening on the inside of the air outlet mesh 33 and the extended air outlet hole 41 is larger than the opening on the outside, which can reduce wind resistance and increase the impact strength of hot air on the printing material 50.

[0051] Furthermore, such as Figure 3 and Figure 5As shown, the air knife 35 extends in the same direction as the feed roller 11, which extends along the third direction Z to ensure the air outlet size of the outer oven 20 in the third direction Z. During the transmission process, the printing material 50 is stably supported by the feed roller 11, while the airflow generated by the air knife 35 evenly covers the surface of the material, avoiding local airflow deviation caused by material shaking or sagging.

[0052] Furthermore, such as Figure 3 and Figure 5 As shown, multiple air knives 35 and first perforated plates 34 are respectively provided, and the air knives 35 and first perforated plates 34 are spaced apart along the extension direction of the material passage 12. The printing material 50 in the entire material passage 12 is fully arranged with air knives 35 and small holes, so that it can be continuously subjected to impact drying throughout the entire process of running in the oven, thereby improving drying efficiency. At the same time, the effective drying area is increased, further improving drying efficiency.

[0053] Furthermore, such as Figure 1 and Figure 3 As shown, the main air outlet plate 30 is positioned corresponding to the drying main body area 13, and the extended air outlet plate 36 is positioned corresponding to the extended area 14. The air knife 35 and air outlet mesh 33 opened in the main air outlet plate 30 enable the printing material 50 to be dried in an impact drying state. The extended air outlet 41 at the extended area 14 can form an air knife 35 at the discharge port 16, effectively preventing hot air from overflowing, and also extending the drying path of the printing material 50, thus improving drying efficiency.

[0054] Furthermore, the length a of the extended air outlet plate 36 in the first direction X is set to 0.5m-0.8m. The extended air outlet 41 in the extended area 14 can form an air knife 35 at the discharge port 16, which effectively prevents hot air from overflowing and also extends the drying path of the printing material 50, thereby improving drying efficiency.

[0055] Furthermore, the main air outlet plate 30 is connected to a return air duct 39, which is located inside the hot air chamber 28. One end of the return air duct 39 is connected to the material passage 12, and the other end is connected to the return air passage 22. The return air duct 39 extends along the first direction X. After the hot air dries the printing material 50, it is discharged from the air outlet 25 through the return air duct 39.

[0056] As one embodiment, the return air duct 39 is connected to a filter screen to increase air resistance and prevent hot air from short-circuiting and forming ineffective drying hot air.

[0057] As one embodiment, multiple return air ducts 39 are provided, and the multiple return air ducts 39 are spaced apart along the second direction Y to improve the smoothness of hot air exhaust.

[0058] Furthermore, the main air outlet plate 30 is connected to a guide plate 40, which is located inside the hot air chamber 28. The guide plate 40 divides the hot air chamber 28 into zones and promotes the flow of hot air towards the material passage 12.

[0059] In one embodiment, multiple guide plates are arranged at intervals along the height direction within the hot air chamber 28 to form an initial drying zone, a main drying zone, and a high-impact drying zone. The initial drying zone is furthest from the air inlet 29. The distance between the main air outlet 31 in the initial drying zone and the conveyor roller 11 in the first direction is b mm; the distance between the main air outlet 31 in the main drying zone and the conveyor roller 11 in the first direction is c mm; and the distance between the main air outlet 31 in the high-impact drying zone and the conveyor roller 11 in the first direction is d mm, where b > c > d. Since the printing material cannot be dried with excessively strong hot air initially upon entering the oven, it is easy to cause the ink surface to dry, meaning only the surface moisture and solvent are removed, forming a sealed layer. Subsequent hot air cannot penetrate the inner layer to remove the moisture and solvent from the inner ink, resulting in false drying. The printing material initially enters the oven and goes into the initial drying zone. Because this zone is furthest from the air inlet 29 and has a relatively large distance between it and the conveyor roller 11 in the first direction, the hot air distribution in this zone is less, resulting in a weaker impact drying effect and preventing false drying. Next, the printing material enters the main drying zone, where the hot air volume is large and the impact effect is strong. The main air outlet 31 is relatively close to the conveyor roller 11 in the first direction, removing a large amount of moisture and solvent from the ink on the printing material. Finally, the printing material enters the strong impact drying zone. Because this zone has the smallest distance between it and the conveyor roller 11 in the first direction, it thoroughly removes the remaining moisture and solvent from the ink on the printing material, completing the drying process.

[0060] In one embodiment, b = 12 mm, c = 10 mm, and d = 8 mm.

[0061] As one embodiment, the guide plate 40 is a bent plate extending along the third direction Z and opening upward. The guide plate 40 is connected and fixed to the inner box 26 at both ends of the third direction Z. The guide plate 40 is provided with multiple through holes for the return air duct 39 to pass through.

[0062] The flow path of the hot air in this utility model is as follows: hot air enters the hot air chamber 28 from the air inlet 29. The hot air in the hot air chamber 28 enters the material passage 12 from the extended air outlet 41, the air knife 35 and the air outlet mesh 33 respectively. The hot air in the material passage 12 dries the printing material 50. After drying, the hot air is discharged through the air outlet 25 via the return air passage 22 formed by the outer box 23 and the inner box 26 and the return air pipe 39.

[0063] The usage process of this utility model is as follows: The bottom oven 10 and the outer oven 20 move away from each other via guide rails. The printing material is fed onto the side of the feed roller 11 facing the outer oven 20. The bottom oven 10 and the outer oven 20 move closer to each other and seal via guide rails. The printing material is located in the feed channel 12, and the oven enters the printing and drying state. The printing material moves evenly on the feed roller 11. Hot air enters the hot air chamber 28 from the air inlet 29. The hot air enters the feed channel 12 through the air knife 35 and the air outlet mesh 33. The printing material in the feed channel 12 passes through the initial drying zone, the main drying zone, the strong impact drying zone, and the extension zone in sequence. The hot air in the feed channel 12 carries away the moisture and solvent in the ink of the printing material. The dried printing material is removed from the outlet 16.

[0064] In summary, this utility model embodiment provides a printing press oven, in which the bottom oven 10 and the outer oven 20 are movable relative to each other. During heat drying, the bottom oven 10 moves toward the outer oven 20, and the edge of the bottom oven 10 is sealed to the edge of the outer oven 20. A material passage 12 is formed between the bottom oven 10 and the outer oven 20. The printing material 50 is fed into the material passage 12 from the feed inlet 15 for heat drying, and then discharged from the discharge outlet 16 after drying. A hot air outlet 21 is provided on the side of the outer oven 20 facing the material passage 12. The hot air from the outer oven 20 is blown out through the hot air outlet 21 to the material passage 12 to dry the material in the material passage 12. The material passage 12 includes a drying main area 13 and an extension area 14. The extension area 14 protrudes from the drying main area 13 on the side facing the bottom oven 10. The printing material 50 first passes through the drying main area 13 for preliminary drying, and then enters the extension area 14. The extension area 14 can extend the effective drying length at the outlet 16 and expand the drying area in the outlet direction, so that the hot air can cover a longer area and improve the drying efficiency.

[0065] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of this utility model, and these improvements and substitutions should also be considered within the protection scope of this utility model.

Claims

1. A printing press drying oven, characterized in that: The device includes a bottom oven and an outer oven. The bottom oven is located below the outer oven and is arranged to move relative to it. The edges of the opposite surfaces of the bottom oven and the outer oven are sealed together. A feed roller is connected to the side of the bottom oven facing the outer oven. A feed channel is formed between the bottom oven and the outer oven. The lower end of the feed channel has a feed inlet and the upper end has a discharge outlet. When the bottom oven and the outer oven are sealed together, the feed roller is located inside the feed channel. A hot air outlet is provided on the side of the outer oven facing the feed channel. The material passage includes a drying main area and an extension area. The extension area protrudes from the drying main area on one side facing the bottom drying oven. The discharge port is located at one end of the extension area, and the other end of the extension area is connected to one end of the drying main area. The inlet is located at the other end of the drying main area.

2. The printing press oven according to claim 1, characterized in that: The printing press oven has intersecting first and second directions. The opening direction of the discharge port is set along the first direction. The hot air outlet includes an extended air outlet, the position of which corresponds to the extended area. The opening direction of the extended air outlet is set along the second direction.

3. The printing press oven according to claim 2, characterized in that: The outer oven includes an outer box, an inner box, a main air outlet plate, and an extended air outlet plate. The opening of the outer box faces the bottom oven. The inner box is connected to the outer box. A return air channel is formed between the inner wall of the outer box and the outer wall of the inner box. The return air channel is connected to the material passage. The outer box has a connection port and an air outlet. The inner box has a hot air chamber and an air inlet that are connected to each other. The outer box is connected to an air inlet pipe and an air outlet pipe. The air inlet pipe passes through the connection port and is connected to the air inlet. The air outlet pipe is connected to the air outlet and is connected to the return air channel. The edge of the bottom oven is sealed to the edge of the outer box. The inner box has an inner box connection port on the side facing the bottom oven. The main air outlet plate and the extended air outlet plate are respectively connected to the inner box connection port. The extended air outlet plate is connected to the upper end of the main air outlet plate. The extended air outlet hole is set on the extended air outlet plate. The hot air outlet also includes a main air outlet hole, which is set on the main air outlet plate. The extended air outlet hole and the main air outlet hole are respectively connected to the material passage and the hot air chamber.

4. The printing press oven according to claim 3, characterized in that: The main air outlet plate includes a plurality of first mesh plates connected to the inner box. The plurality of first mesh plates are connected at intervals along the second direction, and an air knife is formed between adjacent first mesh plates. The first mesh plates are provided with air outlet mesh holes. The main air outlet includes the air knife and the air outlet mesh holes.

5. The printing press oven according to claim 4, characterized in that: The air knife extends in the same direction as the material conveying roller.

6. The printing press oven according to claim 4, characterized in that: Multiple air knives and multiple first mesh plates are provided, and the air knives and the first mesh plates are spaced apart along the extension direction of the material passage.

7. The printing press oven according to claim 3, characterized in that: The main air outlet plate is positioned corresponding to the drying main body area, and the extended air outlet plate is positioned corresponding to the extended area.

8. The printing press oven according to claim 3, characterized in that: The length 'a' of the extended air outlet plate in the first direction is set to 0.5m-0.8m.

9. The printing press oven according to claim 3, characterized in that: The main air outlet plate is connected to a return air duct, which is located inside the hot air chamber. One end of the return air duct is connected to the material passage, and the other end is connected to the return air passage. The return air duct extends along the first direction.

10. The printing press oven according to claim 3, characterized in that: The main air outlet is connected to a guide plate, which is located inside the hot air cavity.

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