Paper-making method sheet drying oven

Abstract

The invention belongs to the technical field of tobacco product production, and particularly relates to a paper-making method sheet drying oven. The paper-making process sheet drying oven comprises a distributed temperature control device, and the distributed temperature control device comprises a drying device and a dehumidifying device; the multiple groups of distributed drying devices are used for drying the paper-making process sheets in sequence and are provided with independent heat sources; the moisture discharging device is connected with the drying device and used for discharging moisture in the drying device. According to the paper-making process sheet drying oven, the paper-making process sheet conveying speed can be increased, the paper-making process sheet is prevented from being hardened and deformed during drying, multi-stage drying and distributed temperature control operation can be conducted on the paper-making process sheet, an air wall formed by hot air can be guided, the hot air can make full contact with the paper-making process sheet conveniently, and the paper-making process sheet drying efficiency is improved. And the paper-making process sheets are uniformly and fully dried.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of tobacco product production, and particularly relates to a papermaking process sheet drying oven. BACKGROUND

[0002] Cigarette, also known as cigarette or paper cigarette, is a kind of tobacco product rolled by tobacco leaves with cigarette paper, and the tobacco smoke is generated by burning for people to smoke. During the production of papermaking process sheet, the papermaking process sheet needs to be dried, and the papermaking process sheet usually needs to be dried in a tunnel. The traditional drying device needs to slowly transport the papermaking process sheet from the inside of the drying oven, and the drying efficiency is low. In order to improve the drying efficiency, the temperature of the drying oven and the speed of the papermaking process sheet need to be improved. If the temperature of the drying oven is too high, the papermaking process sheet is easy to harden and deform.

[0003] There is a coating machine drying oven distributed heating device in the prior art, which comprises a drying oven shell, a heating assembly and a filtering and purifying mechanism. The bottom side of the drying oven shell is fixedly installed with a base, and the bottom side surface of the base is fixedly installed with supporting legs. The filtering and purifying mechanism comprises a filter shell, a communication pipe, an air outlet pipe, a mounting frame, a primary efficiency filter screen, an activated carbon filter screen and a HEPA high efficiency filter screen. The filter shell is fixedly installed at the top side of the drying oven shell, and the top side surface of the filter shell is installed with a filter frame. The filter frame is fixedly connected with a baffle and the HEPA high efficiency filter screen at the bottom side. The bottom side surface of the HEPA high efficiency filter screen is installed with the activated carbon filter screen, and the activated carbon filter screen is provided with the primary efficiency filter screen at the bottom side. The side surface of the filter shell is fixedly communicated with the air outlet pipe, and the bottom side of the air outlet pipe is fixedly communicated with the drying oven shell through the communication pipe. However, the above-mentioned scheme is not convenient for multi-stage drying of the papermaking process sheet, and it is not convenient for distributed adjustment and control of the drying temperature. SUMMARY

[0004] The purpose of the present application is to optimize the drying effect of the papermaking process sheet. In order to solve the technical problem:

[0005] The present application is realized in this way. A papermaking process sheet drying oven comprises a distributed temperature control device, which comprises a drying device and a moisture removal device. A plurality of groups of distributed drying devices are used to sequentially dry the papermaking process sheet, and the plurality of groups of drying devices have independent heat sources. The moisture removal device is connected with the drying device and is used to remove the moisture in the drying device.

[0006] Further, the drying device comprises a lower drying oven, an upper drying oven, an air supply pipe and a heat exchanger. The lower drying oven and the upper drying oven are oppositely arranged to dry the papermaking process sheet between the lower drying oven and the upper drying oven.

[0007] Further, the air supply pipe is communicated with the lower drying oven and the upper drying oven, the air supply pipe is connected with the heat exchanger, and the heat exchanger is located at the side of the upper drying oven.

[0008] Further, the drying device further comprises a conveying pipe, and each lower drying oven and one side of the upper drying oven are fixedly connected with a conveying pipe.

[0009] Further, the drying device further comprises a base, a support frame, a fixing frame, conveying rollers, support seats, a fixing seat, telescopic rods and a movable seat, the top of the base is fixedly connected with the lower drying oven, the top of the base is fixedly connected with the support frame, the support frame is located on the side of the lower drying oven and is attached to the lower drying oven, the top of the base is fixedly connected with the fixing frame, the fixing frame is located on the side of the lower drying oven away from the support frame, the top of the support frame is movably connected with the upper drying oven, and the upper drying oven is located above the lower drying oven.

[0010] Further, a plurality of conveying rollers are rotatably arranged between the support frame and the fixing frame, the plurality of conveying rollers respectively penetrate through the plurality of lower drying ovens, the inner side of each lower drying oven is provided with the plurality of conveying rollers, and the top of the conveying roller extends out of the upper side of the lower drying oven.

[0011] Further, a plurality of support seats are fixedly arranged on the top of the fixing frame, one end of each conveying roller is rotatably connected with one support seat, and the other end of the plurality of conveying rollers is rotatably connected with the support frame.

[0012] Further, the top of the fixing frame is fixedly connected with the fixing seat, and one side of the upper drying oven is fixedly connected with the movable seat, and the movable seat is located above the fixing seat.

[0013] Further, two telescopic rods are movably arranged on the top of the fixing seat, and the output ends of the two telescopic rods are movably connected with the movable seat.

[0014] Further, a plurality of shaft seats are fixedly arranged on the top of the support frame, one side of each upper drying oven is fixedly connected with two shaft frames, and each shaft frame is movably connected with one shaft seat.

[0015] Further, the drying device comprises a dehumidifying pipe, a fixing pipe and a dehumidifying box, each group of the drying device is connected with and communicated with a dehumidifying pipe, and the plurality of dehumidifying pipes are connected with and communicated with the fixing pipe.

[0016] Further, the fixing pipe is connected with and communicated with the dehumidifying box.

[0017] Further, the dehumidifying box is fixedly connected with the top of the plurality of heat exchangers.

[0018] Further, the input end of the dehumidifying box is fixedly connected with the fixing pipe.

[0019] Further, each lower drying oven and one side of the upper drying oven are fixedly connected with a dehumidifying pipe, one end of each dehumidifying pipe is respectively communicated with one lower drying oven or one upper drying oven, and one end of the plurality of dehumidifying pipes is fixedly connected with and communicated with the fixing pipe.

[0020] Further, the drying device further comprises fixing rods, two fixing rods are fixedly installed at the top of the plurality of heat exchangers, and the exhaust box is fixedly connected to the top of the two fixing rods.

[0021] Further, the drying device further comprises fixing boxes and flow guides; each of the lower drying boxes and the interiors of the upper drying boxes is fixedly installed with a fixing box; two flow guides are rotatably installed in the interiors of each of the lower drying boxes and the upper drying boxes; each of the flow guides is fixedly installed with a rotating disc at two ends, and each of the two rotating discs extends out of one side of the lower drying box or the upper drying box and is rotatably connected with the lower drying box or the upper drying box.

[0022] Further, the drying device further comprises net plates, rotating discs, supporting plates and fixing grooves; one supporting plate is fixedly installed at one end of each of the flow guides, each of the supporting plates penetrates a rotating disc and extends out of the rotating disc, and a fixing groove is formed in the inner side of each of the fixing boxes; a net plate is fixedly installed at the inner side of each of the lower drying boxes and the upper drying boxes, and the plurality of net plates are located between the plurality of fixing boxes.

[0023] Compared with the related art, the distributed papermaking sheet drying oven provided by the patent has the following beneficial effects:

[0024] 1. The papermaking sheet is conveyed and moved between the plurality of lower drying boxes and the upper drying boxes, the heat in other medium is transferred to the air through the heat exchanger, the hot air is then conveyed into the interiors of the lower drying boxes and the upper drying boxes through the air supply pipe, the two surfaces of the papermaking sheet can be dried by the lower drying boxes and the upper drying boxes, the suction of the fixed pipe is generated by the exhaust box, the suction of the exhaust pipe is simultaneously generated, the gas in the interiors of the lower drying boxes and the upper drying boxes can be exhausted, the air and the water vapor after drying can be exhausted, the papermaking sheet can be dried, the papermaking sheet can be subjected to multi-stage drying operation by being conveyed between the plurality of lower drying boxes and the upper drying boxes.

[0025] 2. The papermaking sheet can be subjected to temperature measurement by combining the temperature measurement technology, such as the optical fiber temperature measurement technology, the hot air can be provided to each of the lower drying boxes and the upper drying boxes by each of the heat exchangers, the temperature of the hot air provided in each of the lower drying boxes and the upper drying boxes can be controlled, the temperature of the hot air provided by the plurality of lower drying boxes and the upper drying boxes is gradually increased and then gradually decreased, the drying temperature of the papermaking sheet can be gradually increased and then gradually decreased during conveying, the conveying speed of the papermaking sheet can be increased, the hardening and deformation of the papermaking sheet during drying can be avoided, and the papermaking sheet can be subjected to multi-stage drying and distributed temperature control operation.

[0026] 3、By hot gas in conveying to the lower oven and the upper oven inside, the hot gas is located in the fixed box, and the fixed box is used for limiting and storing the hot gas, and then the hot gas is discharged in the form of horizontal air wall, the rotating disc is driven to rotate, the guide plate is synchronously driven to rotate, the guide plate can guide the air wall formed by the hot gas, so that the hot gas can fully contact the papermaking sheet, and the papermaking sheet can be uniformly and fully dried. By driving the rotating disc to rotate to different angles, the guide plate is synchronously rotated to different angles, the hot gas air wall can be conveniently guided in different directions. By the distributed and independently arranged guide plates, the patent can further independently control the drying degree of the papermaking sheet in each drying stage in combination with the distributed heat source.

[0027] 4、The existing papermaking sheet tunnel type drying device cannot finely and distributively adjust the temperature of different drying sections, and can only adjust the temperature of the drying device as a whole. In order to ensure sufficient drying, the papermaking sheet after drying will always be over-dried to cause hardening, or can only be dried at low temperature for a long time. The inventor of the patent finds that this is because the papermaking sheet for different cigarette products has different formula, different specification, and the optimal drying curve of different papermaking sheets in the tunnel type drying process has different characteristics. After dividing the tunnel type drying into different areas, the inventor further finds that the papermaking sheet needs lower drying temperature at the beginning of drying and before the end of drying, and higher drying temperature can be used in the middle of drying, because the production process of the papermaking sheet is: through pulping and papermaking, the manufactured pulp is sized and formed, and the papermaking sheet product is generated through processes such as dewatering, coating and drying. The papermaking sheet oven of the patent is used in the drying process to dry and dewater the sheet, and the process of drying and dewatering is accompanied by the escape of tobacco aroma substances. When the temperature is above 145 degrees Celsius, the higher the temperature, the more tobacco aroma substances escape. When the temperature is below 75 degrees Celsius, the lower the temperature, the less tobacco aroma substances are released. The multi-section oven of the patent sets the temperature from high to low for each section, which can not only meet the production efficiency of the papermaking sheet product, but also reduce the escape of tobacco aroma substances and retain more tobacco aroma substances.

[0028] The papermaking process sheet referred to in the patent is a tobacco sheet. The papermaking process reconstituted tobacco sheet is prepared by using tobacco material or tobacco waste such as tobacco dust, tobacco stem, tobacco leaf fragments and part of low-grade tobacco leaves as raw materials, soaking and extracting with water, then separating the water-soluble and insoluble substances in the tobacco, forming a fiber base by pulping the insoluble substances, adding the water-soluble substances back to the base after concentration, and drying to obtain the papermaking process sheet. The papermaking process sheet can maximize the use of tobacco raw materials and save cigarette costs. On the other hand, the papermaking process sheet plays an important role in reducing the release of cigarette tar and reducing the harm of cigarettes.

[0029] The existing production method of tobacco sheet mainly includes thick pulp method and papermaking method. The tobacco sheet manufactured by the papermaking method is a method completely different from the thick pulp method, and its physical properties and filling properties are much better than those of the thick pulp sheet, which can effectively reduce the tar and harm of cigarette smoke, and plays an increasingly important role in cigarette formula. Because the production process of the papermaking process reconstituted tobacco fully learns from the mature technology and equipment of the papermaking industry, it has an incomparable advantage in the capacity guarantee capability compared with other types of reconstituted tobacco such as roller pressing method and thick pulp method. Through continuous and efficient material processing mode, the scale production of products is realized. According to the different needs of the physical and chemical properties of the papermaking process reconstituted tobacco products, the process adjustment of extraction, pulping and papermaking can be made in a large range to realize the quality control of the physical properties of the products, so as to meet the needs of cigarette enterprises for the industrial processing performance of the papermaking process reconstituted tobacco.

[0030] Generally, the preparation method of the papermaking process tobacco sheet has the following steps: tobacco material (tobacco stem, tobacco leaf fragments) is soaked and extracted with hot water, the water-soluble and insoluble substances in the tobacco are separated by a solid-liquid separation step, the obtained fiber is formed into a sheet base on a paper machine, the obtained water-soluble substance is concentrated by distillation to obtain a tobacco concentrate. The obtained concentrate is coated or sprayed onto the sheet base, and finally dried to become a tobacco sheet. In the process of manufacturing the tobacco sheet by the papermaking method, the traditional process learns from the method of papermaking. BRIEF DESCRIPTION OF DRAWINGS

[0031] The above contents of the present application and the following specific embodiments can be better understood when read in conjunction with the accompanying drawings. It should be noted that the drawings are only examples of the claimed technical solutions.

[0032] Figure 1 It is a schematic diagram of the three-dimensional structure of the patent;

[0033] Figure 2 It is a schematic diagram of the partial cut structure of the base of the patent;

[0034] Figure 3This is a schematic diagram of the cross-sectional structure of the lower oven of this patent;

[0035] Figure 4 This is a schematic diagram of the partial cross-section structure of the fixed pipe of this patent;

[0036] Figure 5 This is a schematic diagram of the cross-sectional structure of the air supply pipe of this patent;

[0037] Figure 6 This is a schematic diagram of the side cutaway structure of the lower oven of this patent;

[0038] Figure 7 This is a schematic diagram of the cross-sectional structure of the guide plate of this patent.

[0039] In the picture:

[0040] 1. Base;

[0041] 2. Support frame;

[0042] 3. Fixed frame;

[0043] 4. Lower the oven;

[0044] 5. Put into oven;

[0045] 6. Air supply pipe;

[0046] 7. Heat exchanger;

[0047] 8. Drain pipe;

[0048] 9. Fixed pipe;

[0049] 10. Fixed rod;

[0050] 11. Dehumidification box;

[0051] 12. Delivery pipe;

[0052] 13. Support seat;

[0053] 14. Fixed seat;

[0054] 15. Telescopic rod;

[0055] 16. Movable seat;

[0056] 17. Screen plate;

[0057] 18. Conveyor roller;

[0058] 19. Axle seat;

[0059] 20. Axle bracket;

[0060] 21. Fixed box;

[0061] 22. deflector;

[0062] 23. Turntable;

[0063] 24. Support plate;

[0064] 25. Fixed slot. DETAILED DESCRIPTION

[0065] The detailed features and advantages of the present invention are described in detail below in the specific embodiments, and the content is sufficient to enable any person skilled in the art to understand the technical content of the present invention and implement it accordingly. Based on the description, claims and drawings disclosed in this specification, those skilled in the art can easily understand the relevant purposes and advantages of the present invention.

[0066] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0067] A papermaking sheet drying oven of the present invention includes a distributed temperature control device, which includes a drying device and a dehumidification device; multiple groups of distributed drying devices are used to dry papermaking sheets in sequence, and the multiple groups of drying devices have independent heat sources; the dehumidification device is connected to the drying device and is used to discharge moisture released by the papermaking sheets in the drying device.

[0068] In some embodiments, the drying device includes a lower oven 4, an upper oven 5, an air supply duct 6, and a heat exchanger 7; the lower oven 4 and the upper oven 5 are arranged opposite to each other to dry the papermaking sheet between the lower oven 4 and the upper oven 5; the air supply duct 6 is connected to the lower oven 4 and the upper oven 5, and the air supply duct 6 is connected to the heat exchanger 7, and the heat exchanger 7 is located on the side of the upper oven 5.

[0069] In some embodiments, the dehumidification device includes a dehumidification pipe 8, a fixed pipe 9, and a dehumidification box 11. Each group of drying devices is connected to and communicates with a dehumidification pipe 8. Multiple dehumidification pipes 8 are connected to and communicate with a fixed pipe 9, and the fixed pipe 9 is connected to and communicates with the dehumidification box 11. The dehumidification box 11 is forced to ventilate the dehumidification pipe 8 to discharge the high-humidity air containing moisture released by the papermaking sheet in the drying device.

[0070] In some embodiments, the drying device further comprises a fixing rod 10. Two fixing rods 10 are fixedly mounted on the top of the plurality of heat exchangers 7, and the dehumidification box 11 is fixedly connected to the top of the two fixing rods 10.

[0071] In some embodiments, the drying device further comprises a fixed box 21 and a guide plate 22; each lower drying oven 4 and upper drying oven 5 is fixedly installed with a fixed box 21; each lower drying oven 4 and upper drying oven 5 is rotatably installed with two guide plates 22; each guide plate 22 is fixedly installed with a rotating disc 23 at both ends, and each two rotating discs 23 extend out of one side of the lower drying oven 4 or upper drying oven 5 and are rotatably connected with the lower drying oven 4 or upper drying oven 5.

[0072] In some embodiments, the drying device further comprises a mesh plate 17, rotating disc 23, support plate 24 and fixed groove 25; one end of each guide plate 22 is fixedly installed with a support plate 24, and each support plate 24 penetrates a rotating disc 23 and extends out of the rotating disc 23; the inner side of each fixed box 21 is provided with a fixed groove 25; the inner side of each lower drying oven 4 and upper drying oven 5 is fixedly installed with a mesh plate 17, and a plurality of mesh plates 17 are located between a plurality of fixed boxes 21.

[0073] To further illustrate the patent, the following specific embodiments are provided.

[0074] Embodiment 1

[0075] The preferred embodiments of the papermaking sheet drying oven provided by the patent are as shown in Figures 1 to 7 .

[0076] A papermaking sheet drying oven comprises a base 1; a plurality of lower drying ovens 4 are fixedly installed on the top of the base 1; a support frame 2 is fixedly connected to the top of the base 1 and located on one side of the lower drying oven 4 and attached to the lower drying oven 4; a fixed frame 3 is fixedly installed on the top of the base 1 and located on the other side of the lower drying oven 4; an upper drying oven 5 is movably connected to the top of the support frame 2 and located below the lower drying oven 4 and oppositely arranged to the lower drying oven 4; one air supply pipe 6 is fixedly connected to one side of each lower drying oven 4 and upper drying oven 5, and each air supply pipe 6 is in communication with one lower drying oven 4 and upper drying oven 5; one heat exchanger 7 is fixedly installed at one end of each air supply pipe 6, and each heat exchanger 7 is located on one side of one upper drying oven 5; one dehumidification box 11 is fixedly installed on the top of a plurality of heat exchangers 7; a fixed pipe 9 is fixedly connected to the input end of the dehumidification box 11; one dehumidification pipe 8 is fixedly installed on one side of each lower drying oven 4 and upper drying oven 5, one end of each dehumidification pipe 8 is in communication with one lower drying oven 4 or upper drying oven 5, and one end of a plurality of dehumidification pipes 8 is fixedly connected to and in communication with the fixed pipe 9; one fixed box 21 is fixedly installed in the interior of each lower drying oven 4 and upper drying oven 5; two guide plates 22 are rotatably installed in the interior of each lower drying oven 4 and upper drying oven 5; a rotating disc 23 is fixedly installed at both ends of each guide plate 22, and each two rotating discs 23 extend out of one side of the lower drying oven 4 or upper drying oven 5 and are rotatably connected with the lower drying oven 4 or upper drying oven 5.

[0077] It should be noted that some of the existing paper sheet drying oven in the actual use process still has certain shortcomings, which is not convenient for multi-stage drying and distributed temperature control operation of paper sheet.

[0078] In this embodiment, the paper sheet to be dried is first transported between the lower ovens 4 and the upper ovens 5, the heat in other medium is transferred to the air through the heat exchanger 7, and then the hot air is transported into the lower ovens 4 and the upper ovens 5 through the air supply pipe 6. The lower ovens 4 and the upper ovens 5 can dry both sides of the paper sheet. The fixed pipe 9 generates suction, and the exhaust pipe 8 generates suction at the same time, so that the gas in the lower ovens 4 and the upper ovens 5 can be exhausted, which is convenient for the exhaust of the dried air and water vapor, and is convenient for the drying of the paper sheet. The paper sheet is transported between the lower ovens 4 and the upper ovens 5, which can be multi-stage dried. Each heat exchanger 7 can provide hot air to each lower oven 4 and upper oven 5, and the temperature of the hot air provided in each lower oven 4 and upper oven 5 can be controlled, so that the temperature of the paper sheet during drying can be controlled in detail. The heat in the hot air provided by the lower ovens 4 and the upper ovens 5 gradually increases and then decreases, so that the drying temperature gradually increases and then decreases when the paper sheet is transported, which can improve the speed of the paper sheet transportation, avoid hardening and deformation of the paper sheet during drying, and can be multi-stage dried and distributed temperature controlled.

[0079] Specifically, the temperature selection range of all ovens is 85-130℃.

[0080] More specifically, when using the paper sheet drying oven, the temperature of the first pair of lower ovens 4 and upper ovens 5 from the entrance end is preferably increased, and the temperature reaches the highest point when the length of all ovens reaches 4 / 9 of the position, and then gradually decreases.

[0081] More specifically, the temperature of the last pair of lower ovens 4 and upper ovens 5 is 8-15℃ higher than that of the first pair of lower ovens 4 and upper ovens 5.

[0082] Specifically, the drying temperature curve needs to be adjusted adaptively according to the vehicle speed, and the vehicle speed is 110-150m / min, and every 10m / min is a regulation gradient.

[0083] More specifically, the top of the plurality of heat exchangers 7 is fixedly provided with two fixed rods 10, and the exhaust box 11 is fixedly connected to the top of the two fixed rods 10.

[0084] In this embodiment, the fixed rods 10 can be connected and fixed between the plurality of heat exchangers 7, and can support and fix the exhaust box 11.

[0085] Specifically, one end of each guide plate 22 is fixedly installed with a support plate 24, each support plate 24 penetrates a rotating disc 23 and extends outside the rotating disc 23, and the inner side of each fixed box 21 is provided with a fixed groove 25.

[0086] In the embodiment, the rotating disc 23 can be conveniently rotated through the support plate 24, and the fixed box 21 can conveniently guide the hot air out in the form of air wall through the fixed groove 25. The drying effect on the nearby papermaking sheet can be adjusted by adjusting the opening degree of the guide plate 22 through the rotating disc 23.

[0087] Specifically, one end of each guide plate 22 is fixedly installed with a support plate 24, each support plate 24 penetrates a rotating disc 23 and extends outside the rotating disc 23, and the inner side of each fixed box 21 is provided with a fixed groove 25.

[0088] In the embodiment, the rotating disc 23 can be conveniently rotated through the support plate 24, and the fixed box 21 can conveniently guide the hot air out in the form of air wall through the fixed groove 25. The drying effect on the nearby papermaking sheet can be adjusted by adjusting the opening degree of the guide plate 22 through the rotating disc 23.

[0089] Specifically, the support frame 2 and the fixed frame 3 are rotatably installed with a plurality of conveying rollers 18, the plurality of conveying rollers 18 penetrate the plurality of lower drying boxes 4 respectively, the inner side of each lower drying box 4 is provided with the plurality of conveying rollers 18, and the top of the conveying roller 18 extends above the lower drying box 4.

[0090] In the embodiment, the papermaking sheet can be conveniently conveyed by rolling through the conveying roller 18.

[0091] Specifically, the top of the fixed frame 3 is fixedly installed with a plurality of support seats 13, one end of each conveying roller 18 is rotatably connected with a support seat 13, and the other end of the plurality of conveying rollers 18 is rotatably installed with the support frame 2.

[0092] In the embodiment, the conveying roller 18 can be rotatably supported through the support seat 13.

[0093] Specifically, the top of the fixed frame 3 is fixedly installed with a fixed seat 14, one side of the upper drying box 5 is fixedly connected with a movable seat 16, and the movable seat 16 is located above the fixed seat 14.

[0094] In the embodiment, the telescopic rod 15 can be supported through the fixed seat 14 and the movable seat 16.

[0095] Specifically, the top of the fixed seat 14 is movably installed with two telescopic rods 15, and the output ends of the two telescopic rods 15 are movably connected with the movable seat 16.

[0096] In the embodiment, the movable seat 16 can be moved up and down through the telescopic rod 15, and the upper drying box 5 can be moved up and down or turned over synchronously.

[0097] Specifically, each lower oven 4 is fixedly installed with a mesh plate 17 on the inner side of the upper oven 5, and a plurality of mesh plates 17 are located between a plurality of fixed boxes 21. The papermaking sheet is transported between the mesh plates 17.

[0098] In this embodiment, the papermaking sheet can be limited and supported by the mesh plate 17, so that the papermaking sheet is prevented from being bent into the inner side of the lower oven 4 and the upper oven 5.

[0099] Specifically, the top of the support frame 2 is fixedly installed with a plurality of shaft seats 19, one side of each upper oven 5 is fixedly connected with two shaft frames 20, and each shaft frame 20 is movably connected with one shaft seat 19.

[0100] In this embodiment, the upper oven 5 and the support frame 2 are movably connected between the shaft seat 19 and the shaft frame 20, so that the angle of the upper oven 5 can be adjusted conveniently.

[0101] In summary, the hot air can be limited and stored by the fixed box 21, and then the hot air is discharged in the form of a horizontal air wall. The air wall formed by the hot air can be guided by the guide plate 22, so that the papermaking sheet can be dried uniformly and sufficiently.

[0102] When the temperature is too high (all ovens are set to be higher than 145℃), the tobacco aroma substances of the papermaking sheet will be dispersed. When the temperature is too low (all ovens are set to be lower than 75℃), the tobacco aroma substances of the papermaking sheet will not be released sufficiently. The drying temperature is gradually increased and then gradually decreased in the present application, so that the water can be dried quickly in the drying process, the dispersion of the tobacco aroma substances is prevented, and the release of the tobacco aroma substances in the subsequent use is promoted.

[0103] Test Example 1

[0104] The papermaking sheet is dehydrated by using the papermaking sheet oven of Example 1, and the temperature of each oven is shown in Table 1 below.

[0105] Table 1, Oven Temperature of Test Example 1

[0106]

[0107] The moisture content of the papermaking sheet in Test Example 1 before drying is 44.6wt%, the moisture content after drying is 18.1wt%, the drying time is 28s, and the energy consumption of the papermaking sheet oven is 612kg / h of steam. The obtained papermaking sheet is relatively dry and hard.

[0108] Test Example 2

[0109] The papermaking sheet is dehydrated by using the papermaking sheet oven of Example 1, and the temperature of each oven is shown in Table 2 below.

[0110] Table 2, Test Example 2 Oven Temperatures

[0111]

[0112] The paper process sheet in Test Example 2 had a moisture content of 44.6 wt% before drying and 18.1 wt% after drying, a drying time of 28 s, and an oven energy consumption of 588.98 kg / h of steam. The paper process sheet was softer and more pliable after drying and had a higher degree of similarity to traditional cut tobacco after being cut.

[0113] The ovens in Test Examples 1 and 2 were numbered according to the direction of travel of the paper process sheet, e.g., the first pair of ovens through which the paper process sheet passed was numbered 1, the second pair of ovens was numbered 2, and the last pair of ovens was numbered 9. Each pair of ovens included an opposing lower oven 4 and an upper oven 5.

[0114] It is understood that the paper process sheet in Test Examples 1 and 2 was prepared in a manner known to those skilled in the art, and the present application is not limited in this regard. Any paper process sheet to be dried in a manner known to those skilled in the art can be used to achieve similar results to those described above in Test Examples 1 and 2. For example, the paper process sheet can be prepared by first soaking tobacco material (tobacco stems, tobacco leaf fragments) in hot water to extract the tobacco material, separating the tobacco water extract from insoluble material such as tobacco fibers by a solid-liquid separation step, forming the resulting fibers into a sheet substrate on a paper machine, and concentrating the resulting water extract by distillation to obtain a tobacco concentrate. The resulting concentrate can be coated or sprayed onto the sheet substrate.

[0115] Similarly, it is to be understood that the above-described embodiments are merely illustrative of the application and that modifications can be made by those skilled in the art, without departing from the spirit and scope of the application as described in the following claims.

Claims

1. A papermaking sheet drying oven, characterized in that: It includes a distributed temperature control device, which includes a drying device and a dehumidification device; The drying devices are distributed in multiple groups and are used to dry the papermaking sheets in sequence, and the drying devices have independent heat sources. The dehumidifying device is connected to the drying device and is used to discharge moisture in the drying device.

2. The papermaking sheet drying oven according to claim 1, wherein: The drying device comprises a lower oven (4), an upper oven (5), an air supply pipe (6), and a heat exchanger (7); The lower oven (4) and the upper oven (5) are arranged opposite to each other to dry the papermaking sheet between the lower oven (4) and the upper oven (5); The air supply pipe (6) is in communication with the lower oven (4) and the upper oven (5), and the air supply pipe (6) is connected to the heat exchanger (7), which is located on the side of the upper oven (5).

3. The papermaking sheet drying oven according to claim 2, wherein: The drying device further comprises a conveying pipe (12); A delivery pipe (12) is fixedly installed between one side of each lower oven (4) and the upper oven (5) and an air supply pipe (6).

4. The papermaking sheet drying oven according to claim 2, wherein: It also includes a base (1), a support frame (2), a fixed frame (3), a conveying roller (18), a supporting seat (13), a fixed seat (14), a telescopic rod (15) and a movable seat (16); The lower oven (4) is fixedly mounted on the top of the base (1); The top of the base (1) is fixedly connected to the support frame (2), and the support frame (2) is located on the side of the lower oven (4) and is in contact with the lower oven (4); The fixing frame (3) is fixedly mounted on the top of the base (1), and the fixing frame (3) is located on a side of the lower oven (4) away from the support frame (2); The top of the support frame (2) is movably connected to the upper oven (5), and the upper oven (5) is located above the lower oven (4); A plurality of conveying rollers (18) are rotatably mounted between the support frame (2) and the fixed frame (3), and the plurality of conveying rollers (18) respectively penetrate the plurality of lower ovens (4). A plurality of conveying rollers (18) are provided on the inner side of each lower oven (4), and the top of the conveying roller (18) extends above the lower oven (4); A plurality of support seats (13) are fixedly mounted on the top of the fixed frame (3), one end of each of the conveying rollers (18) is rotatably connected to one of the support seats (13), and the other ends of the plurality of conveying rollers (18) are rotatably mounted to the support frame (2); The fixed seat (14) is fixedly mounted on the top of the fixed frame (3), and the movable seat (16) is fixedly connected to one side of the upper oven (5), and the movable seat (16) is located above the fixed seat (14); Two telescopic rods (15) are movably mounted on the top of the fixed seat (14), and the output ends of the two telescopic rods (15) are movably connected to the movable seat (16).

5. The papermaking sheet drying oven according to claim 4, wherein: A plurality of shaft seats (19) are fixedly mounted on the top of the support frame (2), and two shaft frames (20) are fixedly connected to one side of each upper oven (5), and each shaft frame (20) is movably connected to a shaft seat (19).

6. The papermaking sheet drying oven according to claim 4, wherein: The dehumidification device comprises a dehumidification pipe (8), a fixed pipe (9) and a dehumidification box (11); Each group of the drying devices is connected to and communicates with a dehumidification pipe (8), and a plurality of the dehumidification pipes (8) are connected to and communicate with a fixed pipe (9); The fixed pipe (9) is connected to and communicates with the dehumidification box (11).

7. The papermaking sheet drying oven according to claim 6, wherein: The dehumidification box (11) is fixedly installed on the top of the plurality of heat exchangers (7); The input end of the dehumidification box (11) is fixedly connected to the fixed pipe (9); A dehumidification pipe (8) is fixedly installed on one side of each of the lower oven (4) and the upper oven (5), one end of each of the dehumidification pipes (8) is respectively connected to a lower oven (4) or an upper oven (5), and one end of the plurality of dehumidification pipes (8) is fixedly connected to and connected to a fixed pipe (9).

8. The papermaking sheet drying oven according to claim 6, wherein: The drying device further comprises a fixing rod (10); Two fixing rods (10) are fixedly installed on the tops of the plurality of heat exchangers (7), and the dehumidification box (11) is fixedly connected to the tops of the two fixing rods (10).

9. The papermaking sheet drying oven according to claim 2, wherein: The drying device further comprises a fixed box (21) and a guide plate (22); A fixed box (21) is fixedly installed inside each of the lower oven (4) and the upper oven (5); Two guide plates (22) are rotatably mounted inside each of the lower oven (4) and the upper oven (5); A turntable (23) is fixedly mounted on both ends of each guide plate (22), and each two turntables (23) extend from two sides of a lower oven (4) or an upper oven (5) and are rotatably connected to the lower oven (4) or the upper oven (5).

10. The papermaking sheet drying oven according to claim 9, wherein: The drying device further comprises a mesh plate (17), a rotating disk (23), a supporting plate (24) and a fixing groove (25); One end of each guide plate (22) is fixedly mounted with a support plate (24), each support plate (24) passes through a turntable (23) and extends out of the turntable (23), and the inner side of each fixing box (21) is provided with a fixing groove (25); A mesh plate (17) is fixedly installed on the inner side of each of the lower oven (4) and the upper oven (5), and the plurality of mesh plates (17) are respectively located between the plurality of fixed boxes (21).

Images