Lightweight high-strength corrugated paper fiber modification preparation equipment and process

Abstract

The application relates to the field of corrugated paper preparation technology and discloses a fiber modification preparation equipment and process of light high-strength corrugated paper, wherein the fiber modification preparation equipment of the light high-strength corrugated paper comprises a reaction tank, a sealing cover and a heating temperature control equipment, a driving motor is installed on the sealing cover, a main stirring shaft is fixed to the output end of the driving motor, beating mechanisms are symmetrically arranged on the two sides of the inner wall of the reaction tank, each group of beating mechanisms comprises a support plate fixedly connected with the inner wall of the reaction tank, a vertical plate in sliding fit with the support plate through an extension component and a plurality of groups of hinged supports fixedly arranged at equal intervals along the height direction of the inner wall of the reaction tank, and each group of hinged supports is rotationally connected with a swing blade through a rotating shaft. The beating mechanisms can simultaneously produce a beating effect on materials at different heights in the tank, the fiber materials can keep a continuous dispersion and movement state, and the contact probability of the modification reagent and the fibers is obviously improved.

Description

Technical Field

[0001] This invention relates to the field of corrugated paper preparation technology, and in particular to fiber modification preparation equipment and processes for lightweight high-strength corrugated paper. Background Technology

[0002] Corrugated paper, due to its light weight, high strength, good cushioning performance, and ease of recycling, has become one of the most widely used packaging materials. The traditional corrugated paper preparation process usually includes major steps such as pulping, fiber modification, papermaking, and corrugation forming. Specifically, waste paper or plant fiber raw materials are first processed into pulp fibers that meet the requirements through processes such as pulping, screening, and beating. Then, the pulp fibers are modified to improve their physical properties. The modified fiber pulp is then formed into corrugated base paper through processes such as wire forming, pressing and dewatering, and drying. Finally, the corrugated base paper is preheated and rolled into corrugated core paper, which is then bonded with face paper and liner paper using adhesives, pressed, dried, and shaped to finally produce corrugated cardboard.

[0003] In existing technologies, fiber modification of lightweight high-strength corrugated paper is usually achieved through chemical modification. Specifically, pulp fibers are fully mixed and reacted with modifying agents in a reaction vessel. The physicochemical properties of the fiber surface are changed through chemical grafting or physical adsorption, thereby improving the strength of the fiber itself and its bonding ability with subsequent reinforcing agents and adhesives, ultimately obtaining modified fiber pulp with reinforcing effect.

[0004] However, in practical applications of existing technologies, fiber reaction tanks commonly suffer from the problem of fiber agglomeration during the modification process. On the one hand, pulp fibers have a large aspect ratio and specific surface area. Under uneven distribution of stirring shear force, fibers are prone to entanglement through hydrogen bonding to form flocs. On the other hand, as the modifying agent is gradually added, the rheological properties of the pulp system change dynamically. The sudden increase in local viscosity will further exacerbate the agglomeration trend of fibers. Agglomerated fibers are prone to forming uneven mixing dead zones in the tank, which are local spaces in the reaction tank far from the stirring core area. In this area, the movement speed and direction of the fiber clumps are inconsistent with the main fluid, and they cannot participate in effective circulation mixing. Due to the significantly reduced contact opportunities between the fiber clumps and the modifying agent in the dead zone and the severely insufficient reaction time, some fibers in the same batch are under-modified, and the modification effect is uneven, which in turn affects the strength index and batch stability of the final corrugated paper. Summary of the Invention

[0005] The purpose of this invention is to provide equipment and process for preparing fiber modification of lightweight and high-strength corrugated paper, so as to solve the problems of fiber agglomeration and uneven modification caused by mixing dead zones in the reaction tank during the modification process in the prior art mentioned in the background.

[0006] The fiber modification preparation equipment and process for lightweight high-strength corrugated paper provided by this invention adopts the following technical solution: The equipment and process for fiber modification preparation of lightweight high-strength corrugated paper includes a reaction vessel, a sealing cover set on the reaction vessel, and a heating and temperature control device set on one side of the reaction vessel. A drive motor is installed on the sealing cover, and a main stirring shaft is fixed to the output end of the drive motor. The main stirring shaft extends into the reaction vessel. Multiple sets of stirring blades are evenly installed on the outer wall of the main stirring shaft along its length direction. The equipment also includes a dispersing mechanism symmetrically arranged on both sides of the inner wall of the reaction vessel. Each dispersing mechanism includes a support plate fixedly connected to the inner wall of the reaction vessel, a vertical plate that slides with the support plate through a telescopic component, and multiple sets of hinged supports fixed at equal intervals along the height direction of the inner wall of the reaction vessel. Each set of hinged supports is rotatably connected to an oscillating blade through a rotating shaft. Each set of oscillating blades is provided with a guide groove along its length direction. A slider corresponding to each guide groove is fixedly connected to the vertical plate, and the slider is slidably embedded in the corresponding guide groove. The vertical plate moves up and down in the vertical direction, and with the sliding action of the guide groove and the slider, the swing blade is driven to swing up and down around the rotating shaft to break up the clumps of pulp fibers in the reaction tank.

[0007] Furthermore, the telescopic component includes a sliding rod fixedly connected to the top of the vertical plate. The sliding rod slides through the support plate and extends above the support plate. A first spring is sleeved on the outer wall of the sliding rod, and the two ends of the first spring are fixedly connected to the support plate and the sliding rod, respectively.

[0008] Furthermore, the reaction vessel is symmetrically equipped with drive mechanisms, which are used to control the vertical plate to move up and down. Each drive mechanism includes a bracket fixedly connected to the inner wall of the reaction vessel, a main shaft rotatably connected to the bracket via a bearing, and a cam fixedly connected to one end of the main shaft. The rim of the cam slides against the bottom end of the vertical plate. Each drive mechanism also includes a gear fixedly sleeved on the other end of the main shaft and an extension rod fixedly connected to the main stirring shaft. An arc-shaped plate is fixedly connected to the end of the extension rod away from the main stirring shaft. The end face of the arc-shaped plate is evenly distributed with multiple teeth that mesh with the gear.

[0009] Furthermore, the arc-shaped plate is positioned below the gear. When the arc-shaped plate rotates to be directly below the gear, the teeth mesh with the gear, driving the main shaft and cam to rotate.

[0010] Furthermore, a roller is rotatably connected to the bottom end of the vertical plate, and the surface of the roller slides in contact with the rim of the cam.

[0011] Furthermore, a first torsion spring is fitted on the outer wall of the main shaft, and the two ends of the first torsion spring are fixedly connected to the bracket and the cam, respectively.

[0012] Furthermore, each set of the brackets is equipped with a lifting mechanism, which includes a base fixedly connected to the bracket and a lifting plate rotatably connected to the base via a shaft. A traction rope is wound around the outer wall of the main shaft. One end of the traction rope is fixedly connected to the outer wall of the main shaft, and the other end of the traction rope is fixedly connected to the lifting plate. A baffle is fixedly connected to the outer wall of the main shaft, which is used to limit the winding trajectory of the traction rope.

[0013] Furthermore, a fixed frame is fixedly connected to the bracket, and a guide wheel is rotatably supported on the fixed frame. The traction rope slides in contact with the groove of the guide wheel.

[0014] Furthermore, a second torsion spring is symmetrically sleeved on the outer wall of the shaft, and the two ends of the second torsion spring are fixedly connected to the base and the lifting plate, respectively.

[0015] The fiber modification preparation process for lightweight high-strength corrugated paper, using the aforementioned fiber modification preparation equipment, includes the following steps: Step 1: After pulping, screening and beating waste paper or plant fiber raw materials, pulp fiber pulp of a predetermined concentration is obtained, and it is added together with the modifying agent into a reaction vessel to obtain the reaction mixture. Step 2: Start the drive motor to rotate the main stirring shaft and stirring blades to continuously stir and mix the reaction mixture. At the same time, use a heating and temperature control device to control the temperature inside the tank at 70℃~90℃ to obtain the reaction mixture. Step 3: During the rotation of the main stirring shaft, the vertical plate is moved up and down by the drive mechanism, which in turn drives the oscillating blades to periodically and forcibly disperse the fiber agglomerates in the reaction mixture, eliminate the mixing dead zone in the tank, and obtain a uniformly dispersed reaction slurry. Step 4: At the same time, the fibrous material deposited at the bottom of the reaction tank is thrown upward by the lifting mechanism, and the oscillating blades achieve multi-dimensional dispersion to further improve the mixing uniformity. Step 5: After reacting for 30-60 minutes, stop stirring to obtain the modified fiber slurry; Step 6: The modified fiber pulp is discharged from the reaction tank, dehydrated, dried, and then sent to the corrugated base paper making process to prepare lightweight high-strength corrugated paper.

[0016] The beneficial effects of this invention are: 1. By setting up a dispersing mechanism, the oscillating blades periodically oscillate up and down through the reciprocating motion of the vertical plate. The blade surfaces strike the fiber clusters at a certain angle, and the resulting impact and shearing forces can break the hydrogen bonds between the fibers, dispersing the large fiber clusters into small fiber bundles or even individual fibers. During the oscillation process, the oscillating blades push the surrounding materials to move, forming a multi-directional turbulent water flow in the reaction tank. This pushes the fiber materials that are stuck near the tank wall towards the center of the tank, forming a circulating flow of materials. This effectively breaks the local static flow field state in the tank and eliminates the mixing dead zone. At the same time, the oscillating blades are arranged in multiple layers at equal intervals along the height of the inner wall of the reaction tank, which can simultaneously disperse materials at different heights in the tank, keeping the fiber materials in a continuous dispersed and moving state, and significantly improving the contact probability between the modified agent and the fiber.

[0017] 2. By setting up a lifting mechanism, the rotation of the main shaft drives the traction rope to retract and extend, driving the lifting plate to reciprocate. The reciprocating motion of the lifting plate can throw the fibrous material deposited at the bottom of the reaction tank upwards, allowing it to enter the main fluid to participate in the circulation and mixing, effectively avoiding the formation of dead zones at the bottom of the tank. By disturbing the material from both the bottom and side walls, a multi-dimensional dispersion effect is achieved, further improving the uniformity of mixing in the reaction tank. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional cross-sectional view of the reaction vessel of the present invention; Figure 3 This is a front view of the cross-sectional structure of the reaction vessel, sealing cap, drive motor, main stirring shaft, stirring blade, dispersing mechanism and drive mechanism of the present invention. Figure 4 This is a three-dimensional structural diagram of the vertical plate, hinged support, swing blade, rotating shaft, sliding rod, and first spring of the present invention; Figure 5 This is a partial three-dimensional cross-sectional view of the vertical plate, hinged support, swing blade, rotating shaft, guide groove and slider of the present invention; Figure 6 This is a three-dimensional structural diagram of the bracket, main shaft, cam, gear, and lifting mechanism of the present invention; Figure 7 This is a three-dimensional structural diagram of the main shaft, cam, gear, and roller of the present invention; Figure 8 This is a three-dimensional structural diagram of the drive motor, main stirring shaft, stirring blade, extension rod, arc plate, and teeth of the present invention. Figure 9 This is a three-dimensional structural diagram of the extension rod, arc plate, and teeth of the present invention; Figure 10This is a top view of the reaction vessel, drive motor, support, gear, extension rod, and arc plate of the present invention. Figure 11 This is a three-dimensional structural diagram of the bracket, main shaft, base, lifting plate, shaft, traction rope, baffle, and second torsion spring of the present invention.

[0019] In the picture: 1. Reaction vessel; 2. Sealing cover; 3. Drive motor; 4. Main stirring shaft; 5. Stirring blade; 6. Dispersing mechanism; 61. Support plate; 62. Vertical plate; 63. Hinge support; 64. Oscillating blade; 65. Rotating shaft; 66. Guide groove; 67. Sliding block; 68. Sliding rod; 69. First spring; 7. Drive mechanism; 71. Bracket; 72. Main shaft; 73. Cam; 74. Gear; 75. Extension rod; 76. Arc plate; 77. Tooth; 78. Roller; 79. First torsion spring; 8. Lifting mechanism; 81. Base; 82. Lifting plate; 83. Shaft; 84. Traction rope; 85. Baffle; 86. Fixing frame; 87. Guide wheel; 88. Second torsion spring; 9. Heating and temperature control equipment. Detailed Implementation

[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0021] Example 1, refer to Figures 1-2 The fiber modification preparation equipment for lightweight high-strength corrugated paper provided by the present invention includes a reaction vessel 1, a sealing cover 2 disposed on the reaction vessel 1, and a heating and temperature control device 9 disposed on one side of the reaction vessel 1. A drive motor 3 is installed on the sealing cover 2, and a main stirring shaft 4 is fixed at the output end of the drive motor 3. The main stirring shaft 4 extends into the reaction vessel 1, and multiple sets of stirring blades 5 are evenly installed on the outer wall of the main stirring shaft 4 along its length direction. The heating and temperature control device 9 is used to heat and control the material in the reaction vessel 1 so that the temperature inside the vessel is maintained within the range required by the process.

[0022] Reference Figures 2-5It also includes a dispersing mechanism 6 symmetrically arranged on both sides of the inner wall of the reaction vessel 1. Each dispersing mechanism 6 includes a support plate 61 fixedly connected to the inner wall of the reaction vessel 1, a vertical plate 62 that slides with the support plate 61 through a telescopic component, and multiple sets of hinged supports 63 fixed at equal intervals along the height direction of the inner wall of the reaction vessel 1. Each set of hinged supports 63 is rotatably connected to an oscillating blade 64 through a rotating shaft 65. It should be noted that the vertical plate 62 adopts a hollow structure, and the oscillating blade 64 can pass through the hollow part of the vertical plate 62 and rotate around the rotating shaft 65. Each set of oscillating blades 64 has a oscillating blade 64 along its length. A guide groove 66 is provided on the vertical plate 62, and a slider 67 corresponding to the guide groove 66 is fixedly connected to the vertical plate 62. The slider 67 is fixed in the hollow part of the vertical plate 62 and is slidably embedded in the corresponding guide groove 66. During operation, the vertical plate 62 moves up and down in the vertical direction, and the slider 67 slides in the guide groove 66, driving the swing blade 64 to swing around the pivot 65. Through the continuous up and down reciprocating motion of the vertical plate 62, the swing blade 64 can be driven to swing up and down periodically, repeatedly beating and breaking up the clumps of pulp fibers in the reaction tank 1.

[0023] The telescopic component includes a sliding rod 68 fixedly connected to the top of the vertical plate 62. The sliding rod 68 slides through the support plate 61 and extends above the support plate 61. A first spring 69 is sleeved on the outer wall of the sliding rod 68. The two ends of the first spring 69 are fixedly connected to the support plate 61 and the sliding rod 68, respectively. The function of the first spring 69 is to provide elastic restoring force. When the external force driving the vertical plate 62 to move upward is released, the first spring 69 can push the vertical plate 62 to return to its original position downward, ensuring that the vertical plate 62 can reciprocate.

[0024] The vertical plate 62 reciprocates up and down, driving the oscillating blade 64 to oscillate periodically. This directly beats the clumps of pulp fibers in the reaction tank 1, forcibly breaking up the fiber agglomerates. When the oscillating blade 64 oscillates, its blade surface beats the fiber clumps at a certain angle. The resulting impact and shearing forces break the hydrogen bonds between the fibers, dispersing the large fiber clumps into smaller fiber bundles or even individual fibers. At the same time, the oscillating blade 64 pushes the surrounding material to move during the oscillation, forming a multi-directional turbulent water flow in the reaction tank 1. This turbulent water flow generates a periodic pulsed flow from the inner wall of the reaction tank 1 towards the center, pushing the fiber material that is stuck near the tank wall towards the central area of ​​the tank, forming a circulating flow of material. This effectively breaks the local static flow field state in the tank and improves the overall mixing efficiency.

[0025] Because the oscillating blades 64 are arranged in multiple layers at equal intervals along the height of the inner wall of the reaction tank 1, they can simultaneously disperse materials at different heights in the tank. Through the beating and agitation of the oscillating blades 64, the fiber material maintains a continuous state of dispersion and movement in the reaction tank 1. The fibers that were originally gathered inside the fiber clusters can be fully exposed and come into full contact with the modifying agent. At the same time, the disturbed water flow accelerates the diffusion and transfer of the modifying agent in the reaction tank 1, significantly increasing the probability of contact between the modifying agent and the fiber, and promoting the uniformity of the chemical modification reaction.

[0026] Reference Figures 2-3 and Figures 6-10 The reaction vessel 1 is also symmetrically equipped with drive mechanisms 7. The drive mechanisms 7 are used to control the vertical plate 62 to move up and down. Each set of drive mechanisms 7 includes a bracket 71 fixedly connected to the inner wall of the reaction vessel 1, a main shaft 72 rotatably connected to the bracket 71 through a bearing, and a cam 73 fixedly connected to one end of the main shaft 72. The rim of the cam 73 slides against the bottom end of the vertical plate 62. Each set of drive mechanisms 7 also includes a gear 74 fixedly sleeved on the other end of the main shaft 72 and an extension rod 75 fixedly connected to the main stirring shaft 4. An arc plate 76 is fixedly connected to the end of the extension rod 75 away from the main stirring shaft 4. The end face of the arc plate 76 is evenly distributed with a plurality of teeth 77 that mesh with the gear 74.

[0027] The arc-shaped plate 76 is positioned below the gear 74. The drive motor 3 drives the main stirring shaft 4 to rotate, and the main stirring shaft 4 drives the arc-shaped plate 76 to rotate synchronously through the extension rod 75. When the arc-shaped plate 76 rotates to below the gear 74, the teeth 77 on the arc-shaped plate 76 mesh with the gear 74. At this time, the rotational motion of the arc-shaped plate 76 is transmitted to the gear 74 through the teeth 77, driving the gear 74 to rotate. The gear 74 drives the main shaft 72 to rotate, and the main shaft 72 drives the cam 73 to rotate. The rim of the cam 73 slides in contact with the bottom end of the vertical plate 62. When the protruding part of the cam 73 turns to the bottom end of the vertical plate 62, it pushes the vertical plate 62 to move upward. When the protruding part of the cam 73 moves away from the bottom end of the vertical plate 62, the vertical plate 62 moves downward to reset under the elastic force of the first spring 69.

[0028] A first torsion spring 79 is sleeved on the outer wall of the main shaft 72. The two ends of the first torsion spring 79 are fixedly connected to the bracket 71 and the cam 73 respectively. The function of the first torsion spring 79 is to provide elastic restoring force. During the rotation of the main shaft 72, the first torsion spring 79 is gradually twisted and generates elastic deformation, storing elastic potential energy. When the gear 74 disengages from the teeth 77 of the arc plate 76, the first torsion spring 79 can drive the cam 73 to rotate in the opposite direction and reset to the initial angle. At the same time, the reverse rotation of the cam 73 pushes the roller 78 through the wheel rim, which can control the vertical plate 62 to move up and down again, so that the swing blade 64 can effectively periodically disperse the fibrous material in the reaction tank 1.

[0029] It should be noted that, referring to Figure 7 A roller 78 is rotatably connected to the bottom end of the vertical plate 62. The wheel surface of the roller 78 slides in contact with the rim of the cam 73. The setting of the roller 78 can convert the sliding friction of the cam 73 into rolling friction, reduce frictional resistance, make the movement of the vertical plate 62 smoother, and reduce component wear.

[0030] Furthermore, refer to Figures 2-3 and Figure 6 Each set of supports 71 is equipped with a lifting mechanism 8. The lifting mechanism 8 includes a base 81 fixedly connected to the support 71 and a lifting plate 82 rotatably connected to the base 81 via a shaft 83. A traction rope 84 is wound around the outer wall of the main shaft 72. One end of the traction rope 84 is fixedly connected to the outer wall of the main shaft 72, and the other end of the traction rope 84 is fixedly connected to the lifting plate 82. A baffle 85 is fixedly connected to the outer wall of the main shaft 72. The baffle 85 is used to limit the winding trajectory of the traction rope 84. When the main shaft 72 rotates... At the same time, the traction rope 84 wound around the outer wall of the main shaft 72 is released and released as the main shaft 72 rotates. Specifically, when the main shaft 72 rotates in one direction, the traction rope 84 is wound around the main shaft 72, and the lifting plate 82 is pulled by the traction rope 84 and rotates around the shaft 83. When the main shaft 72 rotates in the opposite direction, the traction rope 84 is released from the main shaft 72, and the lifting plate 82 is reset. The reciprocating motion of the lifting plate 82 can throw the fiber material deposited at the bottom of the reaction tank 1 upwards, so that it enters the main fluid to participate in the circulation and mixing.

[0031] A fixed frame 86 is fixedly connected to the bracket 71. A guide wheel 87 is rotatably supported on the fixed frame 86. The traction rope 84 slides in contact with the groove of the guide wheel 87. The guide wheel 87 can change the direction of movement of the traction rope 84, making the winding and unwinding of the traction rope 84 smoother, and at the same time guiding the movement trajectory of the traction rope 84.

[0032] Among them, reference Figure 11 A second torsion spring 88 is symmetrically sleeved on the outer wall of the shaft 83. The two ends of the second torsion spring 88 are fixedly connected to the base 81 and the lifting plate 82 respectively. The function of the second torsion spring 88 is to provide elastic restoring force. When the traction rope 84 releases the lifting plate 82, the second torsion spring 88 can drive the lifting plate 82 to quickly return to its original position, ensuring the continuity of the lifting action.

[0033] The working process of the fiber modification preparation equipment for lightweight high-strength corrugated paper provided by this invention is as follows: First, the pretreated pulp fiber slurry and the modifying agent are added together into the reaction tank 1. Then, the drive motor 3 is started, and the drive motor 3 drives the main stirring shaft 4 to rotate. The stirring blades 5 on the main stirring shaft 4 continuously stir and mix the materials in the tank. At the same time, the heating and temperature control device 9 controls the temperature in the tank within the process range. During the rotation of the main stirring shaft 4, the main stirring shaft 4 drives the arc plate 76 to rotate through the extension rod 75. When the arc plate 76 rotates to the gear... When 74 is directly below, the teeth 77 mesh with the gear 74, driving the gear 74 to rotate. The gear 74 drives the main shaft 72 to rotate, and the main shaft 72 drives the cam 73 to rotate. The rim of the cam 73 pushes the roller 78 to move up and down, thereby driving the vertical plate 62 to move up and down reciprocally. The up and down movement of the vertical plate 62 is driven by the cooperation of the slider 67 and the guide groove 66 to drive the swing blades 64 of each layer to swing up and down periodically around the rotating shaft 65. The swing of the swing blades 64 repeatedly beats and disperses the clumps of pulp fibers in the reaction tank 1, effectively eliminating the mixing dead zone.

[0034] Meanwhile, when the main shaft 72 rotates in one direction, the traction rope 84 is gradually wound around the main shaft 72. The tension of the traction rope 84, through the guide wheel 87, pulls the lifting plate 82 to rotate upward around the shaft 83. When the main shaft 72 rotates in the opposite direction under the drive of the first torsion spring 79, the traction rope 84 is gradually released from the main shaft 72. The lifting plate 82 rotates downward under the elastic force of the second torsion spring 88. The reciprocating motion of the lifting plate 82 can throw the fiber material deposited at the bottom of the reaction tank 1 upward, so that it enters the main fluid to participate in the circulation and mixing.

[0035] Example 2: Based on the above-mentioned equipment, the present invention also provides a fiber modification preparation process for lightweight high-strength corrugated paper, including the following steps: Step 1: After pulping, screening and beating the waste paper or plant fiber raw materials, a pulp fiber slurry of a predetermined concentration is obtained. This slurry is then added to reaction tank 1 along with the modifying agent to obtain the reaction mixture. The modifying agent can be selected according to the required fiber properties, such as reinforcing agent, crosslinking agent, hydrophobic agent, etc.

[0036] Step 2: Start the drive motor 3 to drive the main stirring shaft 4 and stirring blades 5 to rotate, continuously stirring and mixing the reaction mixture. At the same time, the temperature inside the tank is controlled at 70℃~90℃ by the heating and temperature control device 9 to obtain the reaction mixture. Heating can accelerate the chemical reaction and improve the modification efficiency.

[0037] Step 3: During the rotation of the main stirring shaft 4, the vertical plate 62 is moved up and down by the drive mechanism 7, which in turn drives the oscillating blade 64 to periodically and forcibly disperse the fiber agglomerates in the reaction mixture, eliminate the mixing dead zone in the tank, and obtain a uniformly dispersed reaction slurry. The beating action of the oscillating blade 64 can break large fiber agglomerates into small fiber bundles or even individual fibers, so that the modified agent can fully contact the fibers.

[0038] Step 4: At the same time, the lifting mechanism 8 throws the fiber material deposited at the bottom of the reaction tank 1 upwards, and the swing blade 64 achieves multi-dimensional dispersion, further improving the mixing uniformity. The lifting mechanism 8 can bring the material deposited at the bottom of the tank back into the main fluid, avoiding the formation of dead zones at the bottom of the tank.

[0039] Step 5: After reacting for 30 to 60 minutes, stop stirring to obtain the modified fiber slurry. The reaction time depends on the fiber type, the type of modifying agent, and the required degree of modification.

[0040] Step 6: The modified fiber pulp is discharged from reaction tank 1, dehydrated and dried, and then sent to the corrugated base paper making process to prepare lightweight and high-strength corrugated paper. The modified fiber pulp has better physical properties and bonding ability with adhesives, which can significantly improve the strength index of corrugated paper.

[0041] The lightweight, high-strength corrugated paper prepared by the above process has stronger bonding force between fibers due to the full dispersion and uniform modification of the fibers. The resulting corrugated paper has higher compressive strength, bursting strength and puncture strength, while maintaining its lightweight characteristics.

[0042] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A fiber modification preparation device for lightweight high-strength corrugated paper, comprising a reaction vessel (1), a sealing cover (2) disposed on the reaction vessel (1), and a heating and temperature control device (9) disposed on one side of the reaction vessel (1), wherein a drive motor (3) is installed on the sealing cover (2), and a main stirring shaft (4) is fixed at the output end of the drive motor (3), the main stirring shaft (4) extends into the reaction vessel (1), and multiple sets of stirring blades (5) are uniformly installed along the length direction on the outer wall of the main stirring shaft (4), characterized in that, It also includes a dispersing mechanism (6) symmetrically arranged on both sides of the inner wall of the reaction tank (1). Each dispersing mechanism (6) includes a support plate (61) fixedly connected to the inner wall of the reaction tank (1), a vertical plate (62) that slides with the support plate (61) through a telescopic component, and multiple sets of hinged supports (63) fixed at equal intervals along the height direction of the inner wall of the reaction tank (1). Each set of hinged supports (63) is rotatably connected to a swing blade (64) through a rotating shaft (65). Each set of swing blades (64) is provided with a guide groove (66) along its length direction. The vertical plate (62) is fixedly connected with a slider (67) that corresponds one-to-one with the guide groove (66). The slider (67) is slidably embedded in the corresponding guide groove (66). The vertical plate (62) moves up and down in the vertical direction, and with the sliding action of the guide groove (66) and the slider (67), the swing blade (64) is driven to swing up and down around the rotating shaft (65) to break up the clumps of pulp fibers in the reaction tank (1).

2. The fiber modification preparation equipment for lightweight high-strength corrugated paper according to claim 1, characterized in that, The telescopic component includes a sliding rod (68) fixedly connected to the top of the vertical plate (62). The sliding rod (68) slides through the support plate (61) and extends above the support plate (61). A first spring (69) is sleeved on the outer wall of the sliding rod (68). The two ends of the first spring (69) are fixedly connected to the support plate (61) and the sliding rod (68) respectively.

3. The fiber modification preparation equipment for lightweight high-strength corrugated paper according to claim 1, characterized in that, The reaction vessel (1) is also symmetrically provided with drive mechanisms (7). The drive mechanisms (7) are used to control the vertical plate (62) to move up and down. Each set of drive mechanisms (7) includes a bracket (71) fixedly connected to the inner wall of the reaction vessel (1), a main shaft (72) rotatably connected to the bracket (71) through a bearing, and a cam (73) fixedly connected to one end of the main shaft (72). The rim of the cam (73) slides against the bottom end of the vertical plate (62). Each set of drive mechanisms (7) also includes a gear (74) fixedly sleeved on the other end of the main shaft (72) and an extension rod (75) fixedly connected to the main stirring shaft (4). An arc plate (76) is fixedly connected to one end of the extension rod (75) away from the main stirring shaft (4). The end face of the arc plate (76) is evenly provided with multiple teeth (77) that mesh with the gear (74).

4. The fiber modification preparation equipment for lightweight high-strength corrugated paper according to claim 3, characterized in that, The arc plate (76) is positioned below the gear (74). When the arc plate (76) rotates to the position directly below the gear (74), the teeth (77) mesh with the gear (74), driving the main shaft (72) and the cam (73) to rotate.

5. The fiber modification preparation equipment for lightweight high-strength corrugated paper according to claim 3, characterized in that, The bottom end of the vertical plate (62) is rotatably connected to a roller (78), and the wheel surface of the roller (78) slides in contact with the rim of the cam (73).

6. The fiber modification preparation equipment for lightweight high-strength corrugated paper according to claim 3, characterized in that, A first torsion spring (79) is sleeved on the outer wall of the main shaft (72), and the two ends of the first torsion spring (79) are fixedly connected to the bracket (71) and the cam (73) respectively.

7. The fiber modification preparation equipment for lightweight high-strength corrugated paper according to claim 3, characterized in that, Each set of brackets (71) is provided with a lifting mechanism (8). The lifting mechanism (8) includes a base (81) fixedly connected to the bracket (71) and a lifting plate (82) rotatably connected to the base (81) via a shaft (83). A traction rope (84) is wound on the outer wall of the main shaft (72). One end of the traction rope (84) is fixedly connected to the outer wall of the main shaft (72), and the other end of the traction rope (84) is fixedly connected to the lifting plate (82). A baffle (85) is fixedly connected to the outer wall of the main shaft (72). The baffle (85) is used to limit the winding trajectory of the traction rope (84).

8. The fiber modification preparation equipment for lightweight high-strength corrugated paper according to claim 7, characterized in that, A fixed frame (86) is fixedly connected to the bracket (71), and a guide wheel (87) is rotatably supported on the fixed frame (86). The traction rope (84) slides in contact with the groove of the guide wheel (87).

9. The fiber modification preparation equipment for lightweight high-strength corrugated paper according to claim 7, characterized in that, The outer wall of the shaft (83) is symmetrically fitted with a second torsion spring (88), and the two ends of the second torsion spring (88) are fixedly connected to the base (81) and the lifting plate (82) respectively.

10. A fiber modification preparation process for lightweight high-strength corrugated paper, using the fiber modification preparation equipment for lightweight high-strength corrugated paper as described in claim 7, characterized in that... Includes the following steps: Step 1: After pulping, screening and beating the waste paper or plant fiber raw material, a pulp fiber pulp of a predetermined concentration is obtained, and it is added together with the modifying agent into the reaction tank (1) to obtain the reaction mixture. Step 2: Start the drive motor (3) to drive the main stirring shaft (4) and stirring blades (5) to rotate, continuously stir and mix the reaction mixture, and at the same time control the temperature inside the tank at 70℃~90℃ through the heating and temperature control device (9) to obtain the reaction mixture; Step 3: During the rotation of the main stirring shaft (4), the vertical plate (62) is controlled to move up and down by the drive mechanism (7), which in turn drives the swing blade (64) to periodically force the fiber agglomerates in the reaction mixture to eliminate the mixing dead zone in the tank and obtain a uniformly dispersed reaction slurry; Step 4: At the same time, the fiber material deposited at the bottom of the reaction tank (1) is thrown upward by the lifting mechanism (8), and multi-dimensional dispersion is achieved in conjunction with the swing blade (64), further improving the mixing uniformity; Step 5: After reacting for 30-60 minutes, stop stirring to obtain the modified fiber slurry; Step 6: The modified fiber pulp is discharged from the reaction tank (1), and after dehydration and drying, it is sent to the corrugated base paper making process to prepare lightweight high-strength corrugated paper.

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