A low-density paperboard and its production system

Abstract

The invention discloses a low-density paperboard and a production system thereof, and relates to the technical field of light industrial papermaking. The invention discloses a low-density paperboard, which is in a flat plate shape and consists of 60 to 70 parts by weight of coniferous wood fiber and 30 to 40 parts by weight of cotton fiber. The cotton fiber is modified by cellulase before pulping. The thickness of the paperboard is 15 to 25 mm. The paperboard comprises an upper and a lower surface of paperboard, a core paper is fixedly arranged between the two surface papers, the core paper is honeycomb-shaped, and the outer surfaces of the two surface papers are coated. The tear resistance and moisture resistance of the paperboard can be greatly improved by coating the surfaces of the two surface papers. The tear index and folding resistance of the low-density paperboard made of the modified cotton fiber and coniferous wood fiber are greatly improved; the dust on the paperboard can be obliquely swept out of the paperboard by a first cleaning roller and a second cleaning roller arranged in an "eight" shape, and the dust on the paperboard can be effectively prevented from gathering.

Description

Technical Field

[0001] The invention relates to the technical field of light industrial papermaking, and in particular to a low-density paperboard and a production system thereof. Background Art

[0002] Paperboard, also known as board paper, is made of thick paper sheets made from various pulps with fibers interwoven with each other. Paperboard can be used in packaging, industrial technology, construction, decoration and other fields.

[0003] Cardboard can be divided into low-density board, medium-density board and high-density board according to density; low-density board has low strength and is mostly used for bending or making stretching parts after wetting, such as forming angle rings, ring-shaped parts, soft paper tubes, etc. Low-density board has good formability, but poor mechanical properties;

[0004] At present, low-density cardboard is mostly made of wood pulp, waste paper pulp, etc. Its thickness is less than 20mm and its density is around 0.75~0.9g / cm3. The existing low-density cardboard has poor cushioning effect, low tear index, low folding resistance and poor moisture resistance when used in packaging, industrial technology and other fields. Summary of the invention

[0005] The object of the present invention is to provide a low-density paperboard and a production system thereof to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above-mentioned purpose, the present invention provides the following technical scheme: a low-density cardboard, which is in the shape of a flat plate, and is composed of 60 to 70 parts by weight of coniferous wood fibers and 30 to 40 parts by weight of cotton fibers, and the cotton fibers are modified by cellulase before pulping, and the thickness of the cardboard is 15 to 25 mm. The cardboard includes upper and lower surface papers, and a core paper is fixedly arranged between the two surface papers, and the core paper is honeycomb-shaped, and the outer surfaces of the two surface papers are coated.

[0007] A low-density cardboard production system is used to produce the above-mentioned low-density cardboard, comprising a base, a top frame and a conveyor belt are fixedly arranged on the base, a laminating mechanism for laminating the cardboard is fixedly arranged on the base, a cleaning mechanism for cleaning dust on the cardboard is fixedly arranged on the side of the top frame close to the base, and a drying mechanism is fixedly arranged on the top frame, and the drying mechanism can clean the cleaning mechanism while drying the cardboard.

[0008] Preferably, the laminating mechanism comprises two fixing frames fixedly arranged on the base, a laminating roller is fixedly arranged between the two fixing frames, and a servo motor is fixedly arranged on one of the fixing frames.

[0009] Preferably, a lower pressure roller is rotatably arranged on the base, two transmission belts are sleeved between the lower pressure roller and the coating roller, and the transmission belts are arranged at both ends of the lower pressure roller in a one-to-one correspondence.

[0010] Preferably, the cleaning mechanism includes a first cleaning roller and a second cleaning roller fixedly mounted on a top frame, the first cleaning roller and the second cleaning roller are arranged in an "eight" shape, and a second bevel gear is fixedly mounted on one end of each of the first cleaning rollers close to the coating roller, and first bevel gears matched with the second bevel gear are fixedly mounted on both ends of the lower pressure roller, a plurality of bristles are fixedly mounted on the first cleaning roller and the second cleaning roller, and a support frame is fixedly mounted on one end of the first cleaning roller and the second cleaning roller away from the second bevel gear, and a bristle pressing tube is fixedly mounted on each of the support frames.

[0011] Preferably, the drying mechanism includes a hot air blower fixedly mounted on a top frame, a first buffer box and a second buffer box are fixedly mounted on the hot air blower, both ends of the second buffer box are fixedly connected with connecting pipes, one end of each connecting pipe away from the first buffer box is fixedly connected with each of the hairpin tubes in a one-to-one correspondence, two ultraviolet lamps are fixedly mounted in the first buffer box, and a first air outlet hole and a second air outlet hole are provided on the outer peripheral surface of each of the hairpin tubes.

[0012] Preferably, a plurality of vent pipes are fixedly connected to the bottom of the second buffer box, an air outlet is fixedly provided at one end of each vent pipe away from the second buffer box, and an air inlet pipe is fixedly connected to the side wall of each vent pipe.

[0013] Preferably, a first valve plate is fixedly disposed in each of the intake pipes, and a second valve plate is rotatably disposed in each of the intake pipes. Each of the first valve plates is rotationally connected to each of the second valve plates in a one-to-one correspondence, and each of the first valve plates and the second valve plates is provided with a connecting hole.

[0014] Preferably, a gear ring is rotatably provided at one end of each of the intake pipes away from the exhaust pipe, a connecting frame is fixedly provided on each of the second valve plates, each of the connecting frames is fixedly connected to each of the gear rings in a one-to-one correspondence, a gear plate meshing with each of the gear rings is slidably provided on the second buffer box, two limit columns are fixedly provided on the side walls of the gear plate, a fixed block is fixedly provided on the second buffer box, and a pin for locking the limit column is slidably provided on the fixed block.

[0015] Preferably, two partitions are fixedly provided on the top frame, and two collecting troughs are fixedly provided on the base.

[0016] In the above technical scheme, the present invention provides a low-density cardboard and its production system, which have the following beneficial effects: 1. By laminating the surfaces of both sides of the paper, the tear resistance and moisture resistance of the cardboard can be greatly improved, and the tear index and folding resistance of the low-density cardboard made of modified cotton fiber and coniferous wood fiber can be greatly improved; 2. By driving the lower pressure roller to rotate through the transmission belt, the first cleaning roller and the second cleaning roller can be driven to rotate, so that the edge of the cardboard can be flattened during transportation and the dust on the cardboard can be cleaned; 3. The first cleaning roller and the second cleaning roller arranged in an "eight" shape can sweep the dust on the cardboard out of the cardboard obliquely, which can effectively prevent the dust on the cardboard from accumulating; 4. The laminating cardboard can be heated by hot air through the drying device, so that the adhesion effect is better; 5. By ionizing the hot air and then blowing it to the bristles and cardboard, the electrostatic dust absorption capacity of the bristles and the cardboard can be effectively reduced, and the dust on the bristles and the cardboard can be blown away. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0018] Figure 1 A schematic diagram of the overall structure provided for an embodiment of the present invention;

[0019] Figure 2 A schematic structural diagram of a first dust cleaning roller provided in an embodiment of the present invention;

[0020] Figure 3 A schematic diagram of the structure of a hair pressing roller provided in an embodiment of the present invention;

[0021] Figure 4 A structural schematic diagram of a drying mechanism provided in an embodiment of the present invention;

[0022] Figure 5 A schematic diagram of the structure of a second buffer tank provided in an embodiment of the present invention;

[0023] Figure 6 A schematic diagram of the structure of the vent pipe provided in an embodiment of the present invention;

[0024] Figure 7 A schematic diagram of the structure of an air intake pipe provided in an embodiment of the present invention;

[0025] Figure 8 The embodiment of the present invention provides Figure 2 A magnified view of the structure at center A;

[0026] Fig. 9The embodiment of the present invention provides Figure 2 A magnified view of the structure at B in the middle;

[0027] Fig.10 The embodiment of the present invention provides Figure 4 Enlarged view of the structure at C in the middle.

[0028] Description of reference numerals:

[0029] 1. Laminating mechanism; 2. Cleaning mechanism; 3. Conveyor belt; 4. Drying mechanism; 5. Base; 6. Top frame; 7. Collecting trough; 11. Laminating roller; 12. Fixed frame; 13. Servo motor; 21. First cleaning roller; 22. Second cleaning roller; 23. Support frame; 24. Pressing tube; 25. First air outlet; 26. Second air outlet; 27. Partition; 31. Lower pressing roller; 32. First bevel gear; 33. Second bevel gear; 34. Transmission belt; 41. Hot air blower; 42. First buffer box; 43. Second buffer box; 44. Ultraviolet lamp; 45. Vent pipe; 46. Air outlet; 47. Inlet pipe; 48. Connecting pipe; 51. First valve plate; 52. Second valve plate; 53. Connecting hole; 54. Connecting frame; 55. Gear ring; 56. Gear plate; 57. Limiting column; 58. Fixing block; 59. Latch. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0031] See also Figure 1-10 A low-density paperboard is in a flat plate shape. The paperboard is composed of 60-70 parts by weight of coniferous wood fiber and 30-40 parts by weight of cotton fiber. The cotton fiber is modified by cellulase before pulping. The thickness of the paperboard is 15-25 mm. The paperboard includes upper and lower layers of paperboard. A core paper is fixedly arranged between the two layers of paper. The core paper is honeycomb-shaped, and the outer surfaces of the two layers of paper are coated. Cotton pulp containing cotton fiber is modified by cellulase before pulping. The core paper is fixedly bonded between the two layers of paper. The tear resistance and moisture resistance of the paperboard can be greatly increased by coating the outer surfaces of the two layers of paper. The cellulase is fermented and concentrated by Trichoderma reesei. The low-density paperboard made of modified cotton fiber and coniferous wood fiber has a tear index increased by 48% to 62% and a folding resistance increased by 54% to 66% compared with ordinary low-density paperboard composed of wood fiber.

[0032] A low-density cardboard production system is used to produce the above-mentioned low-density cardboard, including a base 5, on which a top frame 6 and a conveyor belt 3 are fixedly arranged, a coating mechanism 1 for coating cardboard is fixedly arranged on the base 5, a cleaning mechanism 2 for cleaning dust on the cardboard is fixedly arranged on the side of the top frame 6 close to the base 5, and a drying mechanism 4 is fixedly arranged on the top frame 6, and the drying mechanism 4 can clean the cleaning mechanism 2 while drying the cardboard; the conveyor belt 3 is used to convey the cardboard, and the cardboard is coated by the coating mechanism 1 after the surface is cleaned by the cleaning mechanism 2, and then the coated cardboard is heated by hot air by the drying mechanism 4 to achieve a better adhesion effect, and the coating mechanism 1 is located between the cleaning mechanism 2 and the drying mechanism 4, and the drying mechanism 4 heats the cardboard with hot air while conveying part of the hot air to the cleaning mechanism 2, so that the dust on the cleaning mechanism 2 can be blown away.

[0033] Furthermore, the laminating mechanism 1 includes two fixed frames 12 fixedly arranged on the base 5, a laminating roller 11 is fixedly arranged between the two fixed frames 12, and a servo motor 13 is fixedly arranged on one of the fixed frames 12; the cardboard transported via the conveyor belt 3 is laminated by the laminating roller 11 when passing through the laminating roller 11, the laminating roller 11 is supported by the two fixed frames 12, the output end of the servo motor 13 is fixedly connected to the laminating roller 11, and the laminating roller 11 is driven to rotate by the servo motor 13, so that the unlaminated cardboard is laminated.

[0034] Furthermore, a lower pressing roller 31 is rotatably arranged on the base 5, and two transmission belts 34 are sleeved between the lower pressing roller 31 and the coating roller 11, and each transmission belt 34 is arranged at both ends of the lower pressing roller 31 in a one-to-one manner; one end of the two transmission belts 34 away from the lower pressing roller 31 is sleeved on the end of the coating roller 11 in a one-to-one manner, and when the coating roller 11 rotates, the lower pressing roller 31 is driven to rotate by the two transmission belts 34, and the distance between the lower pressing roller 31 and the conveyor belt 3 is equal to the thickness of the uncoated cardboard. The lower pressing roller 31 is located between the cleaning mechanism 2 and the coating roller 11. When the edge of the uncoated cardboard is lifted up, the lower pressing roller 31 abuts against the cardboard, so that the lifted edge of the cardboard can be smoothed before it contacts the coating roller 11, thereby increasing the coating quality.

[0035] In another embodiment of the present invention: the dust cleaning mechanism 2 includes a first dust cleaning roller 21 and a second dust cleaning roller 22 fixedly arranged on the top frame 6, the first dust cleaning roller 21 and the second dust cleaning roller 22 are arranged in an "eight" shape, and each first dust cleaning roller 21 is fixedly provided with a second bevel gear 33 at one end close to the coating roller 11, and the first bevel gear 32 adapted to the second bevel gear 33 is fixedly provided at both ends of the lower pressure roller 31, and a plurality of bristles are fixedly provided on the first dust cleaning roller 21 and the second dust cleaning roller 22, and a support frame is fixedly provided at one end of the first dust cleaning roller 21 and the second dust cleaning roller 22 away from the second bevel gear 33. 23, a hair pressing tube 24 is fixedly arranged on each support frame 23; each second bevel gear 33 is meshed with each first bevel gear 32 in a one-to-one correspondence, the first cleaning roller 21 and the second cleaning roller 22 are arranged in an "eight" shape along the conveying direction of the conveyor belt 3, the hair pressing tube 24 close to the first cleaning roller 21 is parallel to the first cleaning roller 21 and is located on the side of the first cleaning roller 21, the hair pressing tube 24 close to the second cleaning roller 22 is parallel to the second cleaning roller 22 and is located on the side of the second cleaning roller 22, the distance between the first cleaning roller 21, the second cleaning roller 22 and the corresponding hair pressing tube 24 is less than the length of the bristles, and the first cleaning roller 21 and the second cleaning roller 22 are arranged in an "eight" shape along the conveying direction of the conveyor belt 3. The bristles on the first cleaning roller 21 are perpendicular to the surface of the first cleaning roller 21, and the bristles on the second cleaning roller 22 are perpendicular to the surface of the second cleaning roller 22. When the laminating roller 11 drives the lower pressing roller 31 to rotate, the first cleaning roller 21 and the second cleaning roller 22 are driven to rotate through the cooperation of the first bevel gears 32 and the second bevel gears 33. When the conveyor belt 3 drives the cardboard to move, the first cleaning roller 21 and the second cleaning roller 22 arranged in an "eight" shape clean the dust on the cardboard toward the edge of the cardboard. As the cardboard moves, the dust on the cardboard gradually gathers to the edge of the cardboard, and the first cleaning roller 21 and the second cleaning roller 22 are used to clean the cardboard. The end of the cleaning roller 22 close to the edge of the cardboard cleans the accumulated dust from the cardboard to prevent the presence of too much dust on the cardboard from causing bubbles during lamination, which affects the lamination effect and aesthetics. When the first cleaning roller 21 and the second cleaning roller 22 rotate, the dust on the cardboard is processed by bristles. The bristles will bend when passing through the bristle pressing tube 24. As the first cleaning roller 21 and the second cleaning roller 22 rotate, the bristles will return to a straight state. When the bristles return to a straight state, some of the dust adsorbed on the bristles will be thrown off the bristles, thereby realizing self-cleaning of the first cleaning roller 21 and the second cleaning roller 22.

[0036] In another embodiment of the present invention: the drying mechanism 4 includes a hot air blower 41 fixedly arranged on the top frame 6, a first buffer box 42 and a second buffer box 43 are fixedly arranged on the hot air blower 41, both ends of the second buffer box 43 are fixedly connected with connecting pipes 48, one end of each connecting pipe 48 away from the first buffer box 42 is fixedly connected with each hair pressing tube 24 in a one-to-one correspondence, two ultraviolet lamps 44 are fixedly arranged in the first buffer box 42, and the outer peripheral surface of each hair pressing tube 24 is provided with a first air outlet 25 and a second air outlet 26; the ultraviolet wavelength emitted by the two ultraviolet lamps 44 is 185nm, and the heat The fan 41 has two exhaust holes, which are connected to the first buffer box 42 and the second buffer box 43 respectively. Since the bristles will constantly rub against the cardboard when cleaning the cardboard, the bristles will generate static electricity and have a certain adsorption force on the dust. The hot air blown by the hot air blower 41 in the first buffer box 42 is ionized by the ultraviolet rays emitted by the ultraviolet lamp 44 to generate electrons. The air with a higher temperature is more easily ionized by the ultraviolet rays. The hot air with electrons is blown through the two connecting pipes 48 and transported to each hair pressing tube 24. The inner tube diameter of each connecting pipe 48 is larger than the inner tube diameter of the hair pressing tube 24. The air outlet 25 and each second air outlet 26 are all arranged obliquely, the first air outlet 25 near the first cleaning roller 21 faces the first cleaning roller 21, the first air outlet 25 near the second cleaning roller 22 faces the second cleaning roller 22, and each second air outlet 26 faces the conveyor belt 3. When the hot air in the connecting pipe 48 blows into the hair pressing tube 24, the flow rate is accelerated and blown out through the first air outlet 25 and the second air outlet 26. The hot air with electrons blown out from the first air outlet 25 and the second air outlet 26 has a certain speed. When each bristle abuts against each hair pressing tube 24, the hot air with electrons blown out through the first air outlet 25 and the second air outlet 26 has a certain speed. The electrons in the blown hot air neutralize the static electricity on the bristles, thereby reducing the bristles' ability to adsorb dust. The air blown out from the first air outlet 25 blows part of the dust on the bristles away from the bristles. When the bristles are straightened, most of the dust adsorbed on the bristles can be thrown out again, thereby increasing the self-cleaning effect of the bristles. Part of the hot air in the hair pressing tube 24 is blown toward the cardboard through the second air outlet 26, which can blow away part of the dust on the cardboard and at the same time reduce the static electricity on the cardboard, thereby reducing the cardboard's ability to adsorb dust, thereby making the first cleaning roller 21 and the second cleaning roller 22 have a better cleaning effect.

[0037] Furthermore, a plurality of deflation pipes 45 are fixedly connected to the bottom of the second buffer box 43, and an air outlet 46 is fixedly provided at one end of each deflation pipe 45 away from the second buffer box 43, and an air inlet pipe 47 is fixedly connected to the side wall of each deflation pipe 45; the end of the deflation pipe 45 close to the second buffer box 43 is trumpet-shaped, and the hot air from the hot air blower 41 entering the second buffer box 43 is blown toward the coated paperboard through each deflation pipe 45 and the air outlet 46, and the air outlet 46 is also trumpet-shaped. Since the inner diameter of the opening of the air outlet 46 is larger than that of the deflation pipe 45, the hot air from the hot air blower 41 entering the second buffer box 43 is blown toward the coated paperboard. 45, the flow rate of hot air entering the air outlet 46 from the air release pipe 45 will be reduced, so that the hot air can better contact the paperboard. In the initial state, the air inlet pipe 47 is in a closed state. When the hot air blown out by the hot air blower 41 is at a high temperature, the air inlet pipe 47 is opened. When the hot air passes through the air inlet pipe 47, it will absorb part of the air with a lower temperature outside and enter the air release pipe 45. The hot air in the air release pipe 45 is mixed with the air with a lower temperature outside and the temperature is reduced, thereby preventing the air from being overheated and damaging the film on the surface of the paperboard.

[0038] Furthermore, a first valve plate 51 is fixedly provided in each intake pipe 47, and a second valve plate 52 is rotatably provided in each intake pipe 47. Each first valve plate 51 is rotatably connected with each second valve plate 52 in a one-to-one manner, and each first valve plate 51 and second valve plate 52 is provided with a connecting hole 53. The connection between the first valve plate 51 and the second valve plate 52 in each intake pipe 47 is controlled by the connecting hole 53. When the connecting holes 53 on the first valve plate 51 and the second valve plate 52 in the same intake pipe 47 are aligned, external gas can enter the exhaust pipe 45. When the connecting holes 53 on the first valve plate 51 and the second valve plate 52 are completely staggered, external gas cannot enter the exhaust pipe 45.

[0039] Specifically, a gear ring 55 is rotatably provided at one end of each intake pipe 47 away from the exhaust pipe 45, a connecting frame 54 is fixedly provided on each second valve plate 52, and each connecting frame 54 is fixedly connected with each gear ring 55 in a one-to-one correspondence, a gear plate 56 meshing with each gear ring 55 is slidably provided on the second buffer box 43, two limiting columns 57 are fixedly provided on the side wall of the gear plate 56, a fixing block 58 is fixedly provided on the second buffer box 43, and a latch 59 for locking the limiting column 57 is slidably provided on the fixing block 58; each gear ring 55 is driven by moving the gear plate 56 Rotate, so that each second valve plate 52 rotates, and then controls the opening and closing of each connecting hole 53. The latch 59 is "n-shaped". In the initial state, the limiting column 57 close to the end of the tooth plate 56 is in the latch 59. At this time, each connecting hole 53 is in a closed state. When the tooth plate 56 needs to be moved, the latch 59 is moved upward to separate the latch 59 from the outer limiting column 57. At this time, the tooth plate 56 can move. When the other limiting column 57 moves to the bottom of the latch 59, the latch 59 is moved down to fix it. At this time, each connecting hole 53 is in a connected state.

[0040] Two partitions 27 are fixedly provided on the top frame 6, and two collecting troughs 7 are fixedly provided on the base 5; the two partitions 27 are respectively located directly above the first cleaning roller 21 and the second cleaning roller 22, and the two partitions 27 can prevent some dust from falling onto the cleaned cardboard, and the two collecting troughs 7 are respectively located on both sides of the conveyor belt 3, and the dust cleaned by the first cleaning roller 21 and the second cleaning roller 22 can be collected through the two collecting troughs 7.

[0041] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A low-density paperboard production system, comprising a base (5), on which a top frame (6) and a conveyor belt (3) are fixedly arranged, characterized in that: A laminating mechanism (1) for laminating paperboard is fixedly arranged on the base (5); a dust cleaning mechanism (2) for cleaning dust on paperboard is fixedly arranged on a side of the top frame (6) close to the base (5); a drying mechanism (4) is fixedly arranged on the top frame (6); the drying mechanism (4) can clean the dust cleaning mechanism (2) while drying the paperboard; The laminating mechanism (1) comprises two fixed frames (12) fixedly arranged on a base (5), a laminating roller (11) being fixedly arranged between the two fixed frames (12), and a servo motor (13) being fixedly arranged on one of the fixed frames (12); A lower pressure roller (31) is rotatably arranged on the base (5), two transmission belts (34) are sleeved between the lower pressure roller (31) and the coating roller (11), and the transmission belts (34) are arranged one by one at two ends of the lower pressure roller (31); The cleaning mechanism (2) comprises a first cleaning roller (21) and a second cleaning roller (22) fixedly mounted on a top frame (6); the first cleaning roller (21) and the second cleaning roller (22) are arranged in an "eight" shape; a second bevel gear (33) is fixedly mounted on one end of each of the first cleaning rollers (21) close to the coating roller (11); first bevel gears (32) adapted to the second bevel gear (33) are fixedly mounted on both ends of the lower pressure roller (31); a plurality of bristles are fixedly mounted on the first cleaning roller (21) and the second cleaning roller (22); a support frame (23) is fixedly mounted on one end of the first cleaning roller (21) and the second cleaning roller (22) away from the second bevel gear (33); and a hair pressing tube (24) is fixedly mounted on each of the support frames (23); The drying mechanism (4) comprises a hot air blower (41) fixedly arranged on a top frame (6), a first buffer box (42) and a second buffer box (43) fixedly arranged on the hot air blower (41), both ends of the second buffer box (43) being fixedly connected with connecting pipes (48), one end of each connecting pipe (48) away from the first buffer box (42) being fixedly connected with each of the hair pressing tubes (24) in a one-to-one correspondence, two ultraviolet lamps (44) being fixedly arranged in the first buffer box (42), and a first air outlet hole (25) and a second air outlet hole (26) being opened on the outer peripheral surface of each of the hair pressing tubes (24); The wavelength of ultraviolet light emitted by the two ultraviolet lamps (44) is 185 nm; The bottom of the second buffer box (43) is fixedly connected to a plurality of deflation pipes (45), one end of each deflation pipe (45) away from the second buffer box (43) is fixedly provided with an air outlet (46), and the side wall of each deflation pipe (45) is fixedly connected to an air inlet pipe (47); A first valve plate (51) is fixedly arranged in each of the air intake pipes (47), and a second valve plate (52) is rotatably arranged in each of the air intake pipes (47). Each of the first valve plates (51) and each of the second valve plates (52) are rotatably connected in a one-to-one correspondence, and each of the first valve plates (51) and the second valve plates (52) is provided with a communicating hole (53).

2. A low-density paperboard production system according to claim 1, characterized in that: A gear ring (55) is rotatably provided at one end of each of the air inlet pipes (47) away from the air discharge pipe (45), a connecting frame (54) is fixedly provided on each of the second valve plates (52), each of the connecting frames (54) is fixedly connected to each of the gear rings (55) in a one-to-one correspondence, a gear plate (56) meshing with each of the gear rings (55) is slidably provided on the second buffer box (43), two limit columns (57) are fixedly provided on the side wall of the gear plate (56), a fixed block (58) is fixedly provided on the second buffer box (43), and a latch (59) for locking the limit column (57) is slidably provided on the fixed block (58).

3. A low-density paperboard production system according to claim 2, characterized in that: Two partitions (27) are fixedly arranged on the top frame (6), and two collecting tanks (7) are fixedly arranged on the base (5).

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