Improved process for the production of recycled corrugating medium from waste paper

Abstract

This invention discloses an improved pulping process for producing corrugated core paper from recycled waste paper. The main improvement is in the pulping steps. The improved pulping process involves cutting off the straight section of the good pulp pump pipeline adjacent to the wire forming unit and sequentially connecting it to multiple feeding straight pipelines and multiple mixing straight pipelines via flanges. These feeding straight pipelines are arranged adjacently to form a straight-pipe pulping station. The quantity, type, and proportion of modified agents added to each batch are centrally managed and controlled through the straight-pipe pulping station. This invention is easy to implement, quick to implement, and has low implementation costs, while providing centralized management and control.

Description

Technical Field

[0001] This invention relates to the field of corrugated core paper production technology, and in particular to an improved pulping process for producing corrugated core paper from recycled waste paper. Background Technology

[0002] In the production process of reprocessing waste paper into corrugated core paper, the pulp needs to be mixed according to the performance requirements of the finished paper before forming. There are several methods for mixing pulp. The first method is to use mixing equipment installed in the mixing workshop, which occupies a large area and has relatively high equipment and maintenance costs. The second method is to connect a feeding pump to the 90-degree bend joint of the existing pump pipeline to add the modifier to the pulp. Since multiple modifiers need to be added during the mixing process, and the quality of different batches of pulp is different and the technical requirements of different finished papers are different, the type and proportion of modifiers must be changed before each production. However, a 90-degree bend joint can only connect to 1-2 modifiers at most. The distance between two adjacent 90-degree bend joints in the pump pipeline is long, and multiple 90-degree bend joints used to connect modifiers are even distributed on different floors or in different workshops. The connection points of the modifiers are not concentrated and are scattered, which is not conducive to management and maintenance. Therefore, it is necessary to improve the method. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the purpose of this invention is to provide an improved pulping process for producing corrugated core paper from recycled waste paper. This invention is easy to implement and can be quickly modified, with low implementation costs, and allows for centralized management and control.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is: an improved pulping process for producing corrugated core paper from recycled waste paper, comprising the following steps:

[0005] The process of making coarse pulp involves breaking down waste paper in a pulping tank and draining it to obtain raw pulp.

[0006] The coarse pulp filtration step involves sequentially performing sedimentation, hydraulic impurity removal, and vibrating screen filtration on the raw pulp to remove impurities and obtain coarse pulp.

[0007] The pulping process involves sequentially grinding the coarse pulp and then fine pulp using a pulping unit to obtain a good pulp.

[0008] In the slurry preparation step, the good slurry is directly pumped to the screen forming unit through a good slurry pump pipeline. The straight section of the good slurry pump pipeline adjacent to the screen forming unit is cut off and connected sequentially to multiple feeding straight pipelines and multiple mixing straight pipelines through flanges. The feeding straight pipelines are arranged adjacently to form a straight pipe slurry preparation station. The quantity, type, and proportion of modified agent added for each batch are centrally managed and controlled through the straight pipe slurry preparation station.

[0009] Each feed straight-through pipe is equipped with a straight pipe and flanges fixed at both ends of the straight pipe. An accelerating mixer is fixed inside the straight pipe. The accelerating mixer includes a slurry-blocking plate at the front end, a support rod in the middle, and a fixed bracket at the rear end. The slurry-blocking plate and the fixed bracket are welded to the front and rear ends of the support rod, respectively. The accelerating mixer is welded to the inner wall of the straight pipe via the fixed bracket. The straight pipe has at least one feed port connecting to the inner cavity of the straight channel. Modified agents are fed to corresponding metering pumps through each storage tank. The metering pumps continuously pump the corresponding modified agents into the feed port in a metered manner. The fixed bracket has multiple turbulence-maintaining channels spaced apart by connecting rods along the circumferential direction.

[0010] The slurry-blocking plate is designed as a flat, solid disc, perpendicular to the axis of the straight pipe. Only a 1-5 cm wide annular channel is formed between the slurry-blocking plate and the inner wall of the straight pipe. The good slurry pumped into the speed-increasing mixer is blocked by the slurry-blocking plate and flows into the straight pipe through the annular channel. The slurry-blocking plate increases the flow velocity of the good slurry flowing into the straight pipe and creates turbulence behind it. This allows the modified agent added through the feeding port to quickly mix into the turbulence and become uniformly mixed with the good slurry, resulting in a mixed slurry. The mixed slurry flows out of the straight pipe after passing through various turbulence-maintaining channels, which ensure that the turbulence intensity of the mixed slurry does not decrease.

[0011] A mixing straight pipe, 30-80cm in length, is connected between two adjacent feeding straight pipes via flanges. This mixing straight pipe has only a hollow cavity and provides a turbulent extension zone of 30-80cm for the good slurry after it passes through the feeding straight pipe. The mixing straight pipe ensures that the modified agent added through the feeding straight pipe has sufficient mixing distance and time to achieve uniform mixing.

[0012] The pulp is passed sequentially through multiple feeding and mixing pipes to allow various modified agents to be added into the pulp in sequence and mixed evenly, thus obtaining paper pulp and completing the pulp preparation process.

[0013] In the forming step, the paper pulp is pumped to the screen forming unit for screen forming to obtain a wet pulp layer;

[0014] In the pressing step, the wet pulp layer is transferred to the blanket of the pressing equipment by the first vacuum suction roller, and the wet paper is obtained by the pressing roller of the pressing equipment.

[0015] In the drying step, the wet paper is transferred to the drying unit by the second vacuum suction roller, and the wet paper is dried by the drying roller pulling and heating it to obtain corrugated core paper.

[0016] The fixed support includes a fixed ring located on the outer ring, multiple connecting rods, and a connecting part located at the center. The connecting rods are spaced apart along the circumferential direction. The outer end of each connecting rod is fixedly connected to the fixed ring, and the inner end is fixedly connected to the connecting part. The fixed support is welded and fixed to the straight channel through the fixed ring. The rear end of the support rod is welded and fixed to the connecting part. Multiple turbulence-maintaining channels separated by connecting rods are formed between the fixed ring and the connecting part.

[0017] The inner diameter of the good slurry pumping pipe is 20-30cm. The inner diameter of the feeding straight pipe is the same as that of the good slurry pumping pipe, and the inner diameter of the mixing straight pipe is the same as that of the good slurry pumping pipe. The length of the feeding straight pipe is set to 30±5cm, the width of the annular channel is set to 2-3cm, and the length of the mixing straight pipe is set to 30±5cm. A turbulent extension zone with a length of 30±5cm is formed behind the feeding straight pipe. 5-10 feeding straight pipes and 5-10 mixing straight pipes are set in the straight pipe slurry mixing station. The feeding straight pipes and the mixing straight pipes are connected sequentially to form a straight pipe. The total length of the straight pipe slurry mixing station is controlled to 3-6 meters for centralized management and control.

[0018] The pipeline between the straight-pipe pulp mixing station and the papermaking forming unit is set at a length of 10-20 meters to facilitate control of the state of the papermaking pulp.

[0019] The straight-pipe slurry preparation station is equipped with a control cabinet, which includes a control circuit, a wireless communication circuit electrically connected to the control circuit, and a display screen electrically connected to the control circuit. Each metering pump connected to each feeding straight pipe is electrically connected to the control circuit via a cable. The control circuit controls the working status and feeding speed of each metering pump. The display screen shows the type and proportion of modified agent added by each metering pump. The wireless communication circuit transmits the type and proportion of modified agent added by each metering pump to the control room or a cloud control center set up on the Internet to achieve remote control.

[0020] The advantages of this invention compared to existing technologies are as follows: This invention allows good pulp to pass sequentially through multiple feeding and mixing direct pipes, enabling the sequential addition and uniform mixing of various required modifiers into the good pulp. A straight-pipe pulping station is formed by connecting the feeding and mixing direct pipes, with the total length of the station controlled at 3-6 meters. The station allows for centralized management and control of the quantity, type, and proportion of modifiers added to each batch, facilitating centralized management and control. This invention is achieved by modifying existing good pulp pumping pipelines in waste paper mills, with fast modification speed and low modification cost. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the straight pipe slurry mixing station used in this invention.

[0022] Figure 2 This is a schematic diagram of the feeding straight pipe used in this invention.

[0023] Marked in the image:

[0024] 1-Direct feeding pipeline

[0025] 2-Connecting flange

[0026] 3-Slurry-blocking disc

[0027] 4-Support rod

[0028] 5-Fixed bracket

[0029] 6-Submission Interface

[0030] 7-Fixed Displacement Pump

[0031] 8-Turbulent flow maintenance channel

[0032] 9-Mixing Straight Pipeline

[0033] 10-Fixing Ring

[0034] 11-Link

[0035] 12-Connecting Part

[0036] 13-Good slurry pump material pipeline. Detailed Implementation

[0037] An improved pulping process for producing corrugated core paper from recycled waste paper includes the following steps:

[0038] The process of making coarse pulp involves breaking up waste paper in a pulping tank and discharging it to obtain raw pulp.

[0039] The coarse pulp filtration process involves sequentially performing sedimentation, hydraulic impurity removal, and vibrating screen filtration on the raw pulp to remove impurities and obtain coarse pulp.

[0040] The pulping process involves sequentially grinding the coarse pulp and then grinding it into fine pulp using a pulping unit to obtain a good pulp.

[0041] In the slurry preparation step, the good slurry is directly pumped to the screen forming unit through the good slurry pumping pipeline 13. The straight section of the good slurry pumping pipeline 13 adjacent to the screen forming unit is cut off and connected sequentially to multiple feeding straight pipelines 1 and multiple mixing straight pipelines 9 through flanges 2. The feeding straight pipelines 1 are arranged adjacently to form a straight pipe slurry preparation station. The quantity, type, and proportion of modified agent added for each batch are centrally managed and controlled through the straight pipe slurry preparation station. Figure 1 and 2 As shown.

[0042] Each feed straight pipe 1 is equipped with a straight pipe and flanges 2 fixed at both ends of the straight pipe. An accelerating mixer is fixed inside the straight pipe. The accelerating mixer includes a slurry-blocking disc 3 at the front end, a support rod 4 in the middle, and a fixed bracket 5 at the rear end. The slurry-blocking disc 3 and the fixed bracket 5 are welded to the front and rear ends of the support rod 4, respectively. The accelerating mixer is welded to the inner wall of the straight pipe via the fixed bracket 5. The straight pipe has at least one feed port 6 connecting to the inner cavity of the straight channel. Each modified agent is stored in a corresponding storage tank. The modified agent is then fed to a corresponding metering pump 7 through each storage tank. The metering pump 7 delivers the corresponding modified agent... The modified formulation is continuously pumped into the delivery port 6. The fixed support 5 is provided with multiple turbulence retention channels 8 separated by connecting rods 11 along the circumferential direction. The fixed support 5 includes a fixed ring 10 located on the outer ring, multiple connecting rods 11, and a connecting part 12 located in the center. The connecting rods 11 are distributed at intervals along the circumferential direction. The outer end of each connecting rod 11 is fixedly connected to the fixed ring 10, and the inner end is fixedly connected to the connecting part 12. The fixed support 5 is welded and fixed to the straight channel through the fixed ring 10. The rear end of the support rod 4 is welded and fixed to the connecting part 12. Multiple turbulence retention channels 8 separated by connecting rods 11 are formed between the fixed ring 10 and the connecting part 12.

[0043] The slurry-blocking disc 3 is configured as a flat, solid disc, perpendicular to the axis of the straight pipe. Only a 1-5 cm wide annular channel is formed between the slurry-blocking disc 3 and the inner wall of the straight channel. The good slurry pumped into the speed-increasing mixer is blocked by the slurry-blocking disc 3 and flows into the straight pipe through the annular channel. The slurry-blocking disc 3 increases the flow velocity of the good slurry flowing into the straight pipe and creates turbulence behind it. This allows the modified agent added through the feeding port 6 to quickly mix into the turbulence and become uniformly mixed with the good slurry, resulting in a mixed slurry. The mixed slurry flows out of the straight pipe after passing through various turbulence-maintaining channels 8. The turbulence intensity of the mixed slurry is maintained at a constant level by the turbulence-maintaining channels 8.

[0044] A mixing straight pipe 9, 30-80cm in length, is connected between two adjacent feeding straight pipes 1 via a flange 2. The mixing straight pipe 9 has only a hollow cavity and provides a turbulent extension zone of 30-80cm in length for the good slurry after passing through the feeding straight pipe 1. The mixing straight pipe 9 ensures that the modified agent added through the feeding straight pipe 1 has sufficient mixing distance and time and is mixed uniformly.

[0045] The pulp is passed sequentially through multiple feeding pipes 1 and mixing pipes 9 to allow the various required modifiers to be added into the pulp in sequence and mixed evenly, thus obtaining paper pulp and completing the pulp preparation process.

[0046] The inner diameter of the good pulp pumping pipe 13 is 20-30cm. The inner diameter of the feeding straight pipe 1 is the same as that of the good pulp pumping pipe 13, and the inner diameter of the mixing straight pipe 9 is the same as that of the good pulp pumping pipe 13. The length of the feeding straight pipe 1 is set to 30±5cm, the width of the annular channel is set to 2-3cm, and the length of the mixing straight pipe is set to 30±5cm. A turbulent extension zone with a length of 30±5cm is formed behind the feeding straight pipe 1. 5-10 feeding straight pipes 1 and 5-10 mixing straight pipes 9 are set in the straight pipe pulping station. All feeding straight pipes 1 and mixing straight pipes 9 are sequentially connected to form a straight pipe. The total length of the straight pipe pulping station is controlled to 3-6 meters for centralized management and control. The pipe length between the straight pipe pulping station and the paper forming unit is set to 10-20 meters to facilitate control of the paper pulp state.

[0047] The straight-pipe slurry preparation station is equipped with a control cabinet, which includes a control circuit, a wireless communication circuit electrically connected to the control circuit, and a display screen electrically connected to the control circuit. Each metering pump 7 connected to each feeding straight-through pipe 1 is electrically connected to the control circuit via cables. The control circuit controls the working status and feeding speed of each metering pump 7. The display screen shows the type and proportion of modified agent added by each metering pump 7. The wireless communication circuit transmits the type and proportion of modified agent added by each metering pump 7 to the control room or a cloud control center set up on the Internet to achieve remote control.

[0048] In the forming step, the paper pulp is pumped to the screen forming unit for screen forming to obtain a wet pulp layer.

[0049] In the pressing step, the wet pulp layer is transferred to the blanket of the pressing equipment by the first vacuum suction roller, and then squeezed and dewatered by the pressing roller of the pressing equipment to obtain wet paper.

[0050] In the drying step, the wet paper is transferred to the drying unit by the second vacuum suction roller, and the wet paper is dried by the drying roller pulling and heating it to obtain corrugated core paper.

[0051] This invention is obtained by modifying the existing good pulp pumping pipeline 13 in waste paper making enterprises. It is used to implement the improved pulp mixing process of this invention. The equipment modification cycle is 1-3 days, the modification speed is fast, the construction difficulty of the modification is extremely low, and it basically does not affect the original waste paper making production equipment and systems. Furthermore, the cost of the feeding direct pipeline 1, the mixing direct pipeline 9, and the control cabinet required for the modification of this invention is very low. The overall modification cost is very low and the space occupied is minimal.

Claims

1. An improved pulping process for producing corrugated core paper from recycled waste paper, characterized in that: Includes the following steps, The process of making coarse pulp involves breaking down waste paper in a pulping tank and draining it to obtain raw pulp. The coarse pulp filtration step involves sequentially performing sedimentation, hydraulic impurity removal, and vibrating screen filtration on the raw pulp to remove impurities and obtain coarse pulp. The pulping process involves sequentially grinding the coarse pulp and then fine pulp using a pulping unit to obtain a good pulp. In the slurry preparation step, the good slurry is directly pumped to the screen forming unit through the good slurry pumping pipeline (13). The straight section of the good slurry pumping pipeline (13) adjacent to the screen forming unit is cut off and connected to multiple feeding straight pipelines (1) and multiple mixing straight pipelines (9) in sequence through flanges (2). The feeding straight pipelines (1) are set up adjacent to each other to form a straight pipe slurry preparation station. The quantity, type and ratio of the modified agent added for each batch are centrally managed and controlled through the straight pipe slurry preparation station. Each feed straight pipe (1) is equipped with a straight pipe and flanges (2) fixed at both ends of the straight pipe. An accelerating mixer is fixed inside the straight pipe. The accelerating mixer includes a slurry blocking plate (3) at the front end, a support rod (4) at the middle, and a fixed bracket (5) at the rear end. The slurry blocking plate (3) and the fixed bracket (5) are welded to the front and rear ends of the support rod (4) respectively. The accelerating mixer is welded to the inner wall of the straight pipe through the fixed bracket (5). The straight pipe is equipped with at least one feed port (6) that connects to the inner cavity of the straight channel. The modified preparation is delivered to the corresponding metering pump (7) through each storage tank. The metering pump (7) continuously pumps the corresponding modified preparation into the feed port (6) in a metered manner. The fixed bracket (5) is provided with multiple turbulence maintaining channels (8) separated by connecting rods (11) along the circumferential direction. The slurry blocking plate (3) is set as a solid plate with a flat shape. The slurry blocking plate (3) is perpendicular to the axis of the straight pipe. Only an annular channel with a width of 1-5cm is formed between the slurry blocking plate (3) and the inner wall of the straight channel. The good slurry pumped into the speed-increasing mixer is blocked by the slurry blocking plate (3) and flows into the straight pipe through the annular channel. The slurry blocking plate (3) increases the flow rate of the good slurry flowing into the straight pipe and forms turbulence behind the slurry blocking plate (3). The modified agent added through the feeding port (6) is quickly mixed into the turbulence and mixed evenly with the good slurry to obtain a mixed slurry. The mixed slurry flows out of the straight pipe after passing through each turbulence retention channel (8). The turbulence retention channel (8) keeps the turbulence intensity of the mixed slurry from decreasing. A mixing straight pipe (9) with a length of 30-80cm is connected between two adjacent feeding straight pipes (1) via flanges (2). The mixing straight pipe (9) has only a hollow cavity and provides a turbulent extension zone of 30-80cm for the good slurry after passing through the feeding straight pipes (1). The mixing straight pipe (9) ensures that the modified agent added through the feeding straight pipes (1) has sufficient mixing distance and time and is mixed evenly. The pulp is passed sequentially through multiple feed pipes (1) and mixing pipes (9) to allow the various modified agents required to be added to the pulp in sequence and mixed evenly, thus obtaining paper pulp and completing the pulp preparation process. The fixed support (5) includes a fixed ring (10) located on the outer ring, multiple connecting rods (11), and a connecting part (12) located in the center. The connecting rods (11) are spaced apart along the circumferential direction. The outer end of each connecting rod (11) is fixedly connected to the fixed ring (10), and the inner end is fixedly connected to the connecting part (12). The fixed support (5) is welded and fixed to the straight channel through the fixed ring (10). The rear end of the support rod (4) is welded and fixed to the connecting part (12). Multiple turbulence holding channels (8) separated by connecting rods (11) are formed between the fixed ring (10) and the connecting part (12). The inner diameter of the slurry pumping pipe (13) is 20-30cm. The inner diameter of the feeding straight pipe (1) is the same as that of the slurry pumping pipe (13). The inner diameter of the mixing straight pipe (9) is the same as that of the slurry pumping pipe (13). The length of the feeding straight pipe (1) is set to 30±5cm. The width of the annular channel is set to 2-3cm. The length of the mixing straight pipe (9) is set to 30±5cm. A turbulent extension zone with a length of 30±5cm is formed behind the feeding straight pipe (1). 5-10 feeding straight pipes (1) and 5-10 mixing straight pipes (9) are set in the straight pipe slurry preparation station. Each feeding straight pipe (1) and each mixing straight pipe (9) are connected sequentially to form a straight pipe. The total length of the straight pipe slurry preparation station is controlled to 3-6 meters for centralized management and control. In the forming step, the paper pulp is pumped to the screen forming unit for screen forming to obtain a wet pulp layer; In the pressing step, the wet pulp layer is transferred to the blanket of the pressing equipment by the first vacuum suction roller, and the wet paper is obtained by the pressing roller of the pressing equipment. In the drying step, the wet paper is transferred to the drying unit by the second vacuum suction roller, and the wet paper is dried by the drying roller pulling and heating it to obtain corrugated core paper.

2. The improved pulping process for producing corrugated core paper from recycled waste paper according to claim 1, characterized in that: The pipeline between the straight-pipe pulp mixing station and the papermaking forming unit is set at a length of 10-20 meters to facilitate control of the state of the papermaking pulp.

3. The improved pulping process for producing corrugated core paper from recycled waste paper according to claim 1 or 2, characterized in that: The straight pipe slurry preparation station is equipped with a control cabinet, which includes a control circuit, a wireless communication circuit electrically connected to the control circuit, and a display screen electrically connected to the control circuit. Each metering pump (7) connected to each feeding straight pipe (1) is electrically connected to the control circuit via a cable. The control circuit controls the working status and feeding speed of each metering pump (7). The display screen shows the type and proportion of modified agent added by each metering pump (7). The wireless communication circuit sends the type and proportion of modified agent added by each metering pump (7) to the control room or a cloud control center set up on the Internet to achieve remote control.

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