Paper humidifying box and paper humidifying device

Abstract

The application provides a humidifying box of a paper humidifying device, which comprises an upper box body and a lower box body, the upper box body and the lower box body are hinged at one end and connected by a gas cylinder at the other end; after the upper box body and the lower box body are closed, a cavity is formed between the two box bodies, a paper feeding and discharging gap for feeding and discharging paper is left in the cavity, and the rest part is completely closed; a steam gap for spraying steam is arranged below the upper box body and above the lower box body.

Description

Technical Field

[0001] This invention belongs to the field of papermaking, and specifically relates to a paper humidification device. Background Technology

[0002] Specialty papers, after coating or other processing, are prone to problems such as low moisture content or large moisture differences between the two sides of the paper, requiring rehumidification. Invention patent CN202273142U discloses a paper atomizing humidification device, stating that "a sealed humidification chamber is provided before the paper winding and receiving device, through which the paper passes. At least one row of nozzles is provided in the humidification chamber, located on the lower side of the paper, and connected to a steam source via pipes." This patent involves the paper passing through a humidification chamber where nozzles spray water. However, placing nozzles only at the bottom may result in low rehumidification capacity, uneven moisture distribution on both sides of the paper, and problems such as paper curling and warping. Furthermore, this type of humidification chamber cannot adjust environmental conditions such as temperature, humidity, and pressure within the chamber.

[0003] Patent application CN109049861A discloses a filter paper humidification device and its humidification method. The device describes a housing consisting of a humidification chamber, a return water chamber, and an equipment chamber arranged sequentially from top to bottom. The humidification chamber has a filter paper inlet and a filter paper outlet, both equipped with pressure rollers. A first humidification disc and a second humidification disc are installed at the top and bottom of the humidification chamber, respectively. The humidification device of this invention humidifies the filter paper within the humidification chamber, avoiding significant steam loss and saving water and energy. Steam is directly and evenly sprayed onto the upper and lower surfaces of the filter paper through nozzles on the first and second humidification discs, greatly enhancing the humidification effect. However, this application uses two humidification discs within the humidification chamber for humidification. Using humidification discs only allows for the humidification of specific filter paper types and cannot humidify other types of paper. It also lacks the continuous rehumidification capability required in large papermaking or coating machine production processes. Summary of the Invention

[0004] To address the above problems, the present invention provides a paper humidification device.

[0005] The object of the present invention is achieved in the following manner: a humidification box of a paper humidification device includes an upper box 41 and a lower box 42, the upper box 41 and the lower box 42 are hinged at one end and connected at the other end by a cylinder 44; after the upper box 41 and the lower box 42 are closed, a cavity 14 is formed between the two boxes, the cavity 14 has a paper inlet and outlet slit 45 for paper feeding and discharging, and the rest is completely closed; steam slits 463 for spraying steam are provided below the upper box 41 and above the lower box 42.

[0006] In the humidification box of the paper humidification device, the steam slits 463 below the upper box 41 and above the lower box 42 are staggered in the horizontal direction.

[0007] The humidification box of the paper humidification device has lip 462 on both sides of the steam slit 463.

[0008] In the humidification box of the paper humidification device, the width of the lip 462 in the paper feeding direction is greater than the width of the lip 462 in the paper output direction.

[0009] The humidification chamber of the paper humidification device includes a return air chamber 61 and a steam chamber 62 within the upper chamber 41 and lower chamber 42. The portion away from the steam slit 463 is the return air chamber 61, and the portion closer to the steam slit 463 is the steam chamber 62. The return air chamber 61 and the steam chamber 62 are separated by a partition 63. A return air filter 64 is provided between the slits 462 and between the slits 462 and the chamber wall. A partition cavity 65 is provided in the steam chamber 62 to separate the return air filter 64 and the steam chamber. The return air chamber 61 and the partition cavity 65 are connected by a pipe 66. The return air chamber 61 is connected to a return air duct 43 for recovering steam, and the steam chamber 62 is connected to an air inlet pipe 43 for introducing steam.

[0010] The humidification box of the paper humidification device is made of elastic material at the contact point between the upper box 41 and the lower box 42 when closed.

[0011] A paper humidification device including the humidification box includes a duct 1, a fan 2 installed inside the duct, a filter 11 installed at one end of the duct, and a heat exchanger 3 connected to the other end. A steam pipe 12 is installed between the heat exchanger 3 and the fan 2. The heat exchanger 3 is connected to a steam chamber 62 through an air inlet pipe 43. A return air duct 13 is connected at one end to a return air chamber 61 and at the other end to the section between the fan 2 and the filter 11.

[0012] In the paper humidification device, valves 5 for adjusting air volume are installed on the steam pipe 12, the air inlet pipe 43, and the return air duct 13.

[0013] Compared to existing technologies, this invention creates a high-temperature, high-pressure, and high-humidity working environment through a sealed humidification chamber. This ensures that the paper is not only humidified by steam directly sprayed from the top and bottom nozzles, but also surrounded by a high-temperature, high-pressure, and high-humidity gas atmosphere, resulting in uniform paper rehumidification and minimizing damage to the paper's surface coating. The sealed humidification chamber reduces steam loss, allows for the recovery of excess steam, and reduces energy consumption. The internal temperature, humidity, and pressure of the humidification chamber are adjustable to meet different humidification conditions. This humidification device is suitable for various types of continuous processing operations on paper machines and coating machines. Attached Figure Description

[0014] Figure 1This is a schematic diagram of the cross-section of the humidification box of the present invention;

[0015] Figure 2 Top view of the lower housing;

[0016] Figure 3 This is a schematic diagram of the humidification device of the present invention.

[0017] 1 is the air duct, 11 is the filter screen, 12 is the steam pipe, 13 is the return air duct, 14 is the cavity, 2 is the fan, 3 is the heat exchanger, 4 is the humidification box, 41 is the upper box, 42 is the lower box, 43 is the air inlet pipe, 44 is the cylinder, 45 is the paper inlet / outlet slit, 462 is the slit lip, 463 is the steam slit, 5 is the valve, 61 is the return air chamber, 62 is the steam chamber, 63 is the partition, 64 is the return air filter screen, and 65 is the partition cavity. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] like Figure 1-3 As shown, a paper humidification device includes an upper chamber 41 and a lower chamber 42. The upper and lower chambers 41 and 42 are hinged at one end and connected at the other end via a cylinder 44. When the upper and lower chambers 41 and 42 are closed, a cavity 14 is formed between them. The cavity 14 has a paper inlet / outlet slit 45 for paper feeding and discharging, and the rest is completely sealed. Steam slits 463 for steam emission are provided below the upper chamber 41 and above the lower chamber 42. The arrows indicate the direction of paper movement. After the upper and lower chambers 41 and 42 are closed, the paper enters the cavity 14 through the paper inlet / outlet slit. A mixed gas is injected into the cavity 14 through the straight steam slit 462. The mixed gas first contacts the paper, humidifying it from both the top and bottom. Gas not absorbed by the paper remains in the cavity 14, creating a high-temperature, high-pressure, and high-humidity environment. The paper continues to be humidified by the high-temperature, high-pressure steam atmosphere, enabling continuous humidification after paper feeding. This method of humidifying paper using both the steam slit 463 and the steam atmosphere provides strong humidification and even moisture return on both sides of the paper. When humidifying specialty papers with surface coatings, the steam atmosphere humidification will not damage the coating. The linear steam slit 463 emits air in a linear pattern, completely covering the width of the paper during humidification. Compared to traditional dot-matrix humidification nozzles, it provides stronger and more even humidification.

[0020] In the humidification chamber of the paper humidification device, the steam slits 463 below the upper chamber 41 and above the lower chamber 42 are staggered horizontally. Heated mixed gas enters the humidification chamber and is blown onto the front and back of the paper through the steam slits 462 of the upper and lower chambers 41 respectively. Because the steam slits are staggered, the paper moves through the chamber in a wave-like motion under the influence of the high-temperature, high-humidity steam flow. If the steam slits 462 on both sides are arranged one-to-one, there is also a steam slit 462 opposite each other. When the airflow from the two steam slits 462 is different in strength, the air outlet on the side with stronger airflow may blow the paper towards the opposite steam slit, potentially scraping the paper or hindering its movement. With the steam slits 462 staggered, there are no steam slits on opposite sides, reducing the likelihood of scraping.

[0021] The humidification chamber of the paper humidification device has lip 462 on both sides of the steam slit 463. The lip 462 restricts the direction of gas ejection, ensuring that the mixed gas is sprayed perpendicularly onto the paper surface. The lip 462 can also limit the paper's position, and the uneven airflow at both ends prevents the paper from drifting around.

[0022] In the humidification chamber of the paper humidification device, the width of the slit lip 462 in the paper feeding direction is greater than the width of the slit lip 462 in the paper output direction. Because the slit lip 462 in the paper feeding direction is wider, the paper is less likely to be torn if it touches the slit lip 462.

[0023] The humidification chamber of the paper humidification device includes a return air chamber 61 and a steam chamber 62 within the upper chamber 41 and lower chamber 42. The portion away from the steam slit 463 is the return air chamber 61, and the portion closer to the steam slit 463 is the steam chamber 62. The return air chamber 61 and the steam chamber 62 are separated by a partition 63. A return air filter 64 is provided between the slits 462 and between the slits 462 and the chamber wall. A partition cavity 65 is provided in the steam chamber 62 to separate the return air filter 64 and the steam chamber. The return air chamber 61 and the partition cavity 65 are connected by a pipe 66. The return air chamber 61 is connected to a return air duct 13 for recovering steam, and the steam chamber 62 is connected to an air inlet pipe 43 for introducing steam.

[0024] The humidification chamber of the paper humidification device is made of elastic material at the contact point between the upper chamber 41 and the lower chamber 42 when closed. When the humidification chamber 4 is closed, the elastic material at the contact point between the upper chamber 41 and the lower chamber 42 can undergo a certain deformation, and the contact point has an interference fit, resulting in better sealing, preventing steam from escaping, and ensuring a high-temperature, high-humidity, and high-pressure environment inside the humidification chamber 1.

[0025] A paper humidification device including the aforementioned humidification box includes a duct 1, a fan 2 installed inside the duct, a filter 11 installed at one end of the duct, and a heat exchanger 3 connected to the other end. A steam pipe 12 is installed between the heat exchanger 3 and the fan 2. The heat exchanger 3 is connected to a steam chamber 62 via an air inlet pipe 43. A return air duct 13 is connected at one end to a return air chamber 61, and at the other end to the section between the fan 2 and the filter 11. The arrows indicate the direction of paper movement. After being filtered by the filter 11, air enters the duct 1 under the action of the fan 2. After being compressed by the fan, it mixes with the steam entering the duct 1 through the steam pipe 12. The mixed gas then enters the humidification box 4 through the air inlet pipe 43. Steam from steam pipe 12 enters air duct 1 and mixes with compressed air, causing a temperature drop. Therefore, heat exchanger 3 is needed to heat the mixture. A U-shaped tube can be installed inside heat exchanger 3, through which high-temperature steam is introduced. When the mixed gas comes into contact with the U-shaped tube, it exchanges heat with the high-temperature steam, and the temperature rises before entering the humidification chamber 4 through air inlet pipe 43. A temperature detection device can be installed inside the humidification chamber. By controlling the amount or temperature of steam introduced through the U-shaped tube, the temperature inside the humidification chamber can be adjusted.

[0026] In the paper humidification device, valves 5 for adjusting air volume are installed on the steam pipe 12, the air inlet pipe 43, and the return air duct 13.

[0027] The return air duct 13 can recover excess steam into the air duct 1 under the action of the fan 2 for reuse. Simultaneously, the humidifier box 4 has good sealing properties, preventing steam from escaping. The combined effect of these two factors reduces steam consumption and saves energy. An air pressure detection device can be installed inside the humidifier box to monitor the ambient air pressure. The pressure inside the humidifier box can be adjusted via the valve 5 on the return air duct 13. When paper enters the humidifier box 4, it divides the cavity 14 into upper and lower parts. If the air pressure on both sides is uneven, causing the paper to move unevenly, the valves 5 on the return air ducts 13 connecting the two sides can be adjusted to balance the air pressure on both sides. The return air duct 13 can regulate the humidity inside the humidifier box; when the return air volume increases, both the pressure and humidity inside the humidifier box decrease.

[0028] The amount of steam entering can be adjusted by valve 5 on steam pipe 12, and the humidity inside humidification box 4 can be adjusted by controlling the ratio of steam to air in the mixed gas.

[0029] The working process of this invention is as follows:

[0030] like Figure 1-2As shown, during paper feeding, the cylinder extends, and the upper and lower chambers separate to feed the paper. After paper feeding is completed, the cylinder retracts, and the chambers close. During humidification, air enters the air duct after being filtered by a filter screen under the action of a fan; steam enters the air duct through a steam pipe. The air is pressurized by the fan and mixed with the steam before entering the heat exchanger. The heat exchanger contains heat exchange pipes. High-temperature steam enters the heat exchange pipes, causing the temperature of the heat exchange pipes to rise. The mixed gas enters the heat exchanger and comes into contact with the heat exchange pipes, increasing its temperature. The heated mixed gas then enters the upper and lower chambers through the air inlet pipes.

[0031] When the upper and lower chambers are closed, a cavity is formed between them. The mixed gas is blown out through the steam slits and directly onto both sides of the paper to humidify it. The gas that is not absorbed by the paper dissipates into the cavity. The humidification chamber has good sealing performance. After the high temperature and high humidity mixed gas enters the cavity, it forms a high temperature, high humidity and high pressure atmosphere inside the cavity. This atmosphere humidifies the paper evenly at the same time. The air outlet pipes of the upper and lower chambers are arranged alternately. The heated mixed gas enters the humidification chamber and is blown onto the front and back sides of the paper from the steam slits of the upper and lower chambers, respectively. Affected by the high temperature and high humidity airflow blown out by the nozzles, the paper moves in a wave-like manner inside the chamber. After passing through the chamber, the surface humidification and surface moisture balance are completed.

[0032] Excess gas inside the cavity can enter the return air chamber through the return air filter under the action of fan 2, and then enter fan 2 through return air duct 13 for reuse.

[0033] During the humidification process, the temperature inside the humidification chamber is controlled by controlling the amount or temperature of steam entering through the high-temperature steam pipe, the pressure inside the chamber is controlled by controlling the amount of gas entering the return air duct, and the ratio of air to steam is controlled by controlling the amount of air entering through the steam pipe, thereby controlling the humidity inside the humidification chamber.

[0034] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several changes and improvements without departing from the overall concept of the present invention, and these should also be considered within the scope of protection of the present invention.

Claims

1. A humidifying tank of a paper humidifying device, characterized by: It includes upper box (41), lower box (42), upper box (41) and lower box (42) one end hinge, the other end through the air cylinder (44) connection; Upper box (41) and lower box (42) after closing, the cavity (14) is formed between the two boxes, the cavity (14) is left for paper in and out of the paper in and out of the seam (45), the rest is completely closed; Upper box (41) below and lower box (42) above are provided for steam out of the steam seam (463); The steam seam (463) below the upper box (41) and above the lower box (42) is staggered in the horizontal direction; The steam seam (463) of the upper box (41) and the lower box (42) is staggered, and the paper is waved through the box under the influence of high temperature and high humidity steam flow; There is no steam seam (463) on the opposite side of the steam seam (463), which is not easy to scratch; The steam seam (463) is provided with a seam lip (462) on both sides; The width of the seam lip (462) in the paper feeding direction is greater than that of the seam lip (462) in the paper discharging direction, and the width of the seam lip (462) in the paper feeding direction is wider, so that the paper is not easy to be scratched if it touches the seam lip (462); The upper box (41) and the lower box (42) include return air chamber (61) and steam chamber (62), the part away from the steam seam (463) is the return air chamber (61), the part close to the steam seam (463) is the steam chamber (62), the return air chamber (61) and the steam chamber (62) are separated by the partition (63); The return air filter screen (64) is arranged between the seam lip (462) and the seam lip (462) and the box wall, and the steam chamber (62) is provided with a separation cavity (65) for separating the return air filter screen (64) and the steam chamber (62); The return air chamber (61) and the separation cavity (65) are connected by the pipeline (66); The return air chamber (61) is connected with the return air duct (13) for recycling steam, and the steam chamber (62) is connected with the air inlet pipeline (43) for introducing steam.

2. The humidifying tank of the paper humidifying device according to claim 1, wherein: The contact part of the upper box (41) and the lower box (42) is made of elastic material when closed.

3. A paper moistening device comprising the moistening box according to any one of claims 1 to 2, characterized in that: It includes the air duct (1), the fan (2) is arranged in the air duct (1), one end of the air duct is provided with the filter screen (11), the other end is connected with the heat exchange body (3), the steam pipeline (12) is arranged between the heat exchange body (3) and the fan (2); The heat exchange body (3) is connected with the steam chamber (62) through the air inlet pipeline (43); One end of the return air duct (13) is connected with the return air chamber (61), and the other end is connected with the part between the fan (2) and the filter screen (11) of the air duct.

4. A paper moistening device as claimed in claim 3, characterized in that: The steam pipeline (12), the air inlet pipeline (43) and the return air duct (13) are all provided with the valve (5) for adjusting the air volume.

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