A kind of atomized spraying starch sizing device and its sizing method for improving the friction coefficient of kraft paper

Abstract

The application discloses a kind of atomization spraying starch sizing device and its sizing method for improving kraft paper friction coefficient, belong to papermaking technical field, device includes spraying liquid mixing stirring mechanism, spraying liquid circulating spraying mechanism and paper machine net part's couch roll, after mixing stirring mechanism preparation starch liquid is sent into the starch storage tank of circulating spraying mechanism, filter screen pocket and stirring vane are equipped in storage tank;Starch liquid is sent to the pumping pipe that is transversely arranged above couch roll after being pressurized by extraction pump, is evenly sprayed to the surface of wet paper web by atomization nozzle, effectively improves paper surface roughness and friction coefficient, and the excess starch liquid not sprayed is returned to storage tank by reflux control valve and reflux pipe, forms circulating loop, reduces waste, device is integrated with flow control valve, pressure gauge and detachable filter screen pocket, it is convenient to adjust spraying parameter, prevent pipeline blockage and guarantee operating stability, with compact structure, high starch utilization rate, can significantly improve the antiskid performance of kraft paper, suitable for packaging paper production.

Description

Technical Field

[0001] This invention relates to the field of papermaking technology, specifically to an atomized spray starch sizing device and its sizing method for improving the friction coefficient of kraft paper. Background Technology

[0002] In the papermaking industry, kraft paper is commonly used to make packaging bags and cartons, requiring a high coefficient of friction to prevent slippage during stacking or transport. Traditional methods for improving the coefficient of friction of kraft paper often employ surface sizing or coating processes, but these suffer from problems such as uneven sizing, easy clogging of pipes and nozzles by the sizing agent, and low utilization rate of the sizing solution. Especially when starch solution is used as the sizing agent, flocculent clumps in the starch solution easily accumulate during transport and spraying, leading to frequent clogging of the spraying system, affecting the stability of continuous production and the sizing effect. Furthermore, existing sizing devices often lack effective recycling and filtration designs, resulting in starch waste and increased production costs. Therefore, there is an urgent need for a sizing device that can apply sizing evenly, prevent clogging, recycle starch solution, and effectively improve the coefficient of friction of kraft paper. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the purpose of this invention is to provide an atomized spray starch sizing device and its sizing method for improving the coefficient of friction of kraft paper.

[0004] The technical solution adopted by this invention to solve its technical problem is: A starch sizing device for improving the friction coefficient of kraft paper by atomizing spraying includes a spray liquid mixing and stirring mechanism, a spray liquid circulation spraying mechanism connected to the spray liquid mixing and stirring mechanism, and a spool roll installed on the wire section of a paper machine for use in conjunction with the spray liquid circulation spraying mechanism. Furthermore, the spray liquid circulation spraying mechanism includes a starch storage tank, a filter screen, a starch liquid extraction pump, a starch liquid pumping pipe, a starch liquid delivery pipe horizontally mounted above the roller, a flow control valve, a reflux control valve, several spray nozzles, and a reflux pipe; one end of the starch liquid delivery pipe is connected to the output end of the starch liquid extraction pump, the other end of the starch liquid delivery pipe is provided with the reflux control valve, one end of the reflux pipe is connected to the reflux control valve, and the other end of the reflux pipe is connected to the starch storage tank.

[0005] Preferably, the spray liquid mixing and stirring mechanism includes a mixing tank, a purified water inlet pipe, a starch supply pipe, a starch liquid supply pipe, and a starch liquid supply pipe control valve; the purified water inlet pipe and the starch supply pipe are respectively connected to the top of the mixing tank; one end of the starch liquid supply pipe is connected to the lower side of the mixing tank, and the other end of the starch liquid supply pipe is connected to the spray liquid circulation spraying mechanism; the starch liquid supply pipe control valve is installed on the starch liquid supply pipe. The outlet of the starch solution supply pipe and the return port of the return pipe are both aligned with the filter screen, which is used to filter out flocculent clumps that have formed in the starch solution.

[0006] Preferably, the starch storage tank is also equipped with a stirring blade inside, and the filter bag is designed to be quickly disassembled and installed.

[0007] Preferably, one end of the starch liquid pump pipe is connected to the starch storage tank, and the other end of the starch liquid pump pipe is connected to the input end of the starch liquid extraction pump.

[0008] Preferably, the flow control valve is installed on the starch liquid pumping pipe and close to the starch liquid extraction pump, the reflux control valve is installed at the end of the starch liquid pumping pipe, and a plurality of the spray nozzles are located between the flow control valve and the reflux control valve and facing toward the roller.

[0009] Furthermore, the spray nozzle is an atomizing nozzle, used to atomize the starch liquid and spray it onto the kraft paper web on the surface of the roll.

[0010] Preferably, a pressure gauge is also installed on the starch liquid pumping pipe, and the pressure gauge is located near the flow control valve.

[0011] Preferably, one end of the reflux pipe is connected to the reflux control valve, and the other end of the reflux pipe is connected to the starch storage tank, forming a circulation loop for the starch liquid.

[0012] Preferably, the spray liquid mixing and stirring mechanism and the spray liquid circulation spraying mechanism are integrated on the same frame, and the starch storage tank is located downstream of the mixing and stirring tank.

[0013] A method for applying starch sizing via atomized spray to improve the coefficient of friction of kraft paper includes the following steps: S1. Preparation of starch solution: In the mixing tank of the spray liquid mixing and stirring mechanism, add the set proportion of clean water and starch through the clean water inlet pipe and starch supply pipe respectively, and then start the mixing tank to stir thoroughly to form a uniform starch solution for later use. S2. Starch liquid delivery and primary filtration: Open the control valve of the starch liquid supply pipe to allow the mixed starch liquid to enter the starch storage tank of the spray liquid circulation spraying mechanism through the starch liquid supply pipe. The outlet of the starch liquid supply pipe is aligned with the filter screen at the top inside the starch storage tank. The flocculent clumps in the starch liquid are intercepted by the filter screen to prevent subsequent blockage of the pipes and nozzles. The filtered starch liquid is stored in the starch storage tank for later use. S3. Circulation pressurization and flow regulation: Start the starch liquid extraction pump and extract the filtered starch liquid from the starch storage tank through the starch liquid pump pipe. After being pressurized by the extraction pump, the starch liquid is sent into the starch liquid pumping pipe that is mounted above the roller. During this process, the spray flow rate is adjusted by the flow control valve and the pipeline pressure is monitored by the pressure gauge to ensure that the spray pressure is stable within the range required for atomization. S4. Atomized Spray Sizing: The starch liquid flows through several spray nozzles on the starch liquid pump pipe. The spray nozzles atomize the starch liquid and spray it evenly onto the wet paper web on the surface of the wire section of the paper machine, so that the atomized starch liquid forms a uniform thin layer on the paper web surface, improving the paper surface roughness and friction coefficient. S5. Excess starch solution recirculation: The excess starch solution that was not sprayed out during the atomized spraying sizing in step S4 continues to flow along the starch solution pump pipe to the end recirculation control valve. Adjust the recirculation control valve so that the excess starch solution returns to the starch storage tank through the recirculation pipe. The return port of the recirculation pipe is also aligned with the filter screen bag for filtration and recycling.

[0014] The beneficial effects of this invention are as follows: This atomized starch sizing device, through its integrated design and circulating spraying system, atomizes the starch liquid and sprays it evenly onto the wet paper web on the surface of the roll, significantly improving the friction coefficient of the kraft paper. At the same time, it effectively prevents nozzle clogging and reduces starch waste by using a double filter screen and a return pipeline. Furthermore, it achieves adjustable spraying parameters and prevents sedimentation by using a flow control valve, pressure gauge, and built-in stirring blades. Thus, while improving the anti-slip performance of the paper surface, it also ensures the stability of equipment operation, reduces production costs, and facilitates maintenance. Attached Figure Description

[0015] Figure 1 This is a structural diagram of an atomized spray starch sizing device for improving the friction coefficient of kraft paper according to the present invention. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0017] Example like Figure 1 As shown, an atomized spray starch sizing device for improving the friction coefficient of kraft paper includes a spray liquid mixing and stirring mechanism 1, a spray liquid circulation spraying mechanism 2 connected to the spray liquid mixing and stirring mechanism 1, and a spool roll 3 installed on the wire section of a paper machine and used in conjunction with the spray liquid circulation spraying mechanism 2. The spray liquid circulation spraying mechanism 2 includes a starch storage tank 21, a filter screen 22, a starch liquid extraction pump 23, a starch liquid pumping pipe 24, a starch liquid delivery pipe 25 horizontally mounted above the roller 3, a flow control valve 26, a return control valve 27, several spray nozzles 28, and a return pipe 29. One end of the starch liquid pumping pipe 25 is connected to the output end of the starch liquid extraction pump 23, and the other end of the starch liquid pumping pipe 25 is equipped with the return control valve 27. One end of the 9 is connected to the reflux control valve 27, and the other end of the reflux pipe 29 is connected to the starch storage tank 21. Specifically, a complete atomized spray sizing system is formed to realize closed-loop control of starch liquid from mixing, conveying, spraying to reflux. Excess starch liquid can be returned to the storage tank 21 through the reflux control valve 27 and the reflux pipe 29 to reduce waste. The filter screen 22 can intercept flocculent clumps to prevent clogging. The overall structure is compact and easy to install and use above the wire section of the paper machine.

[0018] The spray liquid mixing and stirring mechanism 1 includes a mixing and stirring tank 11, a clean water inlet pipe 12, a starch supply pipe 13, a starch liquid supply pipe 14, and a starch liquid supply pipe control valve 15; the clean water inlet pipe 12 and the starch supply pipe 13 are respectively connected to the upper part of the mixing and stirring tank 11; one end of the starch liquid supply pipe 14 is connected to the lower side of the mixing and stirring tank 11, and the other end of the starch liquid supply pipe 14 is connected to the spray liquid circulation spraying mechanism 2; the starch liquid supply pipe control valve 15 is installed on the starch liquid supply pipe 14.

[0019] The outlet of the starch solution supply pipe 14 and the return port of the return pipe 29 are both aligned with the filter screen 22, which is used to filter out flocculent clumps that have formed in the starch solution.

[0020] Specifically, it realizes online preparation and supply of starch solution; the filter bag 22 simultaneously receives freshly prepared starch solution and returned starch solution, which can filter flocculent clumps in the secondary filter and significantly reduce the risk of nozzle clogging; the control valve 15 facilitates the start and stop of the liquid supply and is flexible in operation.

[0021] The starch storage tank 21 is also equipped with an agitator blade, and the filter bag 22 is designed for quick disassembly and assembly. Specifically, the agitator blade prevents starch sedimentation, ensures uniform spray concentration, and thus improves sizing consistency; the filter bag 22 is quick to disassemble and assembly, facilitating regular cleaning or replacement, reducing maintenance time, and ensuring continuous production.

[0022] One end of the starch liquid pump take-up pipe 24 is connected to the starch storage tank 21, and the other end of the starch liquid pump take-up pipe 24 is connected to the input end of the starch liquid extraction pump 23, ensuring that the extraction pump 23 can stably draw in the filtered starch liquid, avoiding large particulate impurities from entering the pump body and subsequent pipelines, and extending the equipment life.

[0023] The flow control valve 26 is installed on the starch liquid pumping pipe 25 and close to the starch liquid extraction pump 23. The return flow control valve 27 is installed at the end of the starch liquid pumping pipe 25. Several spray nozzles 28 are located between the flow control valve 26 and the return flow control valve 27 and are oriented toward the roller 3.

[0024] It should be further explained that the flow control valve 26 can adjust the spray volume to adapt to different machine speeds and paper web requirements; the positional arrangement of the return control valve 27 and the spray nozzle 28 allows excess starch liquid to flow back smoothly, and at the same time facilitates backflushing and cleaning by adjusting the return valve when the nozzle is clogged.

[0025] The spray nozzle 28 is an atomizing nozzle used to atomize the starch liquid and spray it onto the kraft paper web on the surface of the roll 3. The atomized spraying can make the starch liquid form a uniform thin layer on the wet paper web surface, avoiding local excessive thickness or missed spraying, thereby effectively improving the paper surface roughness and friction coefficient. Moreover, the atomized droplets are more easily absorbed by the paper web, reducing starch loss.

[0026] A pressure gauge 251 is also installed on the starch liquid pumping pipe 25, and the pressure gauge 251 is located near the flow control valve 26. Specifically, it monitors the pipeline pressure in real time to determine whether the spray nozzle 28 is blocked and whether the system is operating normally; in conjunction with the flow control valve 26, it can precisely adjust the atomization pressure to ensure stable spraying effect.

[0027] One end of the return pipe 29 is connected to the return control valve 27, and the other end of the return pipe 29 is connected to the starch storage tank 21, forming a circulation loop for the starch liquid, realizing the recycling of the starch liquid. The unsprayed starch liquid can be returned to the storage tank for reuse, which greatly improves the starch utilization rate and reduces production costs; at the same time, it helps to maintain stable fluid pressure in the pipeline.

[0028] In this embodiment, the spray liquid mixing and stirring mechanism 1 and the spray liquid circulating spraying mechanism 2 are integrated on the same frame, and the starch storage tank 21 is located downstream of the mixing and stirring tank 11.

[0029] This invention also provides a method for applying starch by atomization spray to improve the coefficient of friction of kraft paper, comprising the following steps: S1. Preparation of starch solution: In the mixing tank 11 of the spray liquid mixing and stirring mechanism 1, add the set proportion of clean water and starch through the clean water inlet pipe 12 and the starch supply pipe 13 respectively, and then start the mixing tank 11 to stir fully to form a uniform starch solution for later use. S2. Starch liquid delivery and primary filtration: Open the starch liquid supply pipe control valve 15 to allow the mixed starch liquid to enter the starch storage tank 21 of the spray liquid circulation spraying mechanism 2 through the starch liquid supply pipe 14. The outlet of the starch liquid supply pipe 14 is aligned with the filter screen 22 inside the starch storage tank 21. The flocculent clumps in the starch liquid are intercepted by the filter screen 22 to prevent subsequent blockage of the pipes and nozzles. The filtered starch liquid is stored in the starch storage tank 21 for later use. S3. Circulation pressurization and flow regulation: Start the starch liquid extraction pump 23, and extract the filtered starch liquid from the starch storage tank 21 through the starch liquid pump pipe 24. After being pressurized by the extraction pump 23, the starch liquid is sent into the starch liquid pumping pipe 25 that is mounted above the flat roller 3. During this process, the spray flow rate is adjusted by the flow control valve 26, and the pipeline pressure is monitored by the pressure gauge 251 to ensure that the spray pressure is stable within the range required for atomization. S4. Atomized spray sizing: The starch liquid flows through several spray nozzles 28 on the starch liquid pump pipe 25. The spray nozzles 28 atomize the starch liquid and spray it evenly onto the wet paper web on the surface of the paper machine wire section 3, so that the atomized starch liquid forms a uniform thin layer on the paper web surface, improving the paper surface roughness and friction coefficient. S5. Excess starch solution recirculation: The excess starch solution that was not sprayed out during the atomized spraying process in step S4 continues to flow along the starch solution pump pipe 25 to the end recirculation control valve 27. Adjust the recirculation control valve 27 so that the excess starch solution returns to the starch storage tank 21 through the recirculation pipe 29. The return port of the recirculation pipe 29 is also aligned with the filter screen 22 for filtration and recycling.

[0030] It should be further noted that during continuous production, the stirring blades inside the starch storage tank 21 operate at a low speed to prevent starch from settling.

[0031] It should be further noted that the filter bag 22 needs to be removed periodically for cleaning or replacement to ensure the filtration effect.

[0032] It should be further explained that, based on the changes in the readings of pressure gauge 251 and flow control valve 26, it is determined whether the spray nozzle 28 is blocked, and backflushing or cleaning is performed in a timely manner by adjusting the return control valve 27.

[0033] In summary, the complete atomized spray sizing process described above ensures that every step of the starch solution process, from preparation to recirculation, is controllable; double filtration and stirring prevent sedimentation, effectively solving the problems of clogging and sedimentation; pressure gauges and flow valves monitor and promptly detect nozzle blockages and perform backflushing; ultimately achieving continuous, stable, and efficient production of kraft paper with improved friction coefficient.

[0034] The above embodiments of the present invention are not intended to limit the scope of protection of the present invention. The implementation of the present invention is not limited thereto. All other modifications, substitutions or alterations made to the above structure of the present invention based on the above content of the present invention, in accordance with ordinary technical knowledge and common practice in the field, without departing from the basic technical idea of ​​the present invention, shall fall within the scope of protection of the present invention.

Claims

1. A device for atomizing and spraying starch sizing to improve the coefficient of friction of kraft paper, characterized in that, It includes a spray liquid mixing and stirring mechanism (1), a spray liquid circulation spraying mechanism (2) connected to the spray liquid mixing and stirring mechanism (1), and a cam roll (3) installed on the wire section of a paper machine in cooperation with the spray liquid circulation spraying mechanism (2). The spray liquid circulation spraying mechanism (2) includes a starch storage tank (21), a filter screen (22), a starch liquid extraction pump (23), a starch liquid pumping pipe (24), a starch liquid pumping pipe (25) spanning above the roller (3), a flow control valve (26), a return control valve (27), several spray nozzles (28), and a return pipe (29). One end of the starch liquid pumping pipe (25) is connected to the output end of the starch liquid extraction pump (23), and the other end of the starch liquid pumping pipe (25) is provided with the return control valve (27). One end of the return pipe (29) is connected to the return control valve (27), and the other end of the return pipe (29) is connected to the starch storage tank (21).

2. The atomized spray starch sizing device for improving the coefficient of friction of kraft paper according to claim 1, characterized in that, The spray liquid mixing and stirring mechanism (1) includes a mixing and stirring tank (11), a clean water inlet pipe (12), a starch supply pipe (13), a starch liquid supply pipe (14), and a starch liquid supply pipe control valve (15); the clean water inlet pipe (12) and the starch supply pipe (13) are respectively connected to the top of the mixing and stirring tank (11); one end of the starch liquid supply pipe (14) is connected to the lower side of the mixing and stirring tank (11), and the other end of the starch liquid supply pipe (14) is connected to the spray liquid circulation spraying mechanism (2); the starch liquid supply pipe control valve (15) is installed on the starch liquid supply pipe (14); The outlet of the starch liquid supply pipe (14) and the return port of the return pipe (29) are both aligned with the filter screen (22), which is used to filter out the flocculent clumps that condense in the starch liquid.

3. The atomized spray starch sizing device for improving the coefficient of friction of kraft paper according to claim 1, characterized in that, The starch storage tank (21) is also equipped with a stirring blade inside, and the filter bag (22) is designed to be quick to install and remove.

4. The atomized spray starch sizing device for improving the coefficient of friction of kraft paper according to claim 1, characterized in that, One end of the starch liquid pump pipe (24) is connected to the starch storage tank (21), and the other end of the starch liquid pump pipe (24) is connected to the input end of the starch liquid extraction pump (23).

5. The atomized spray starch sizing device for improving the coefficient of friction of kraft paper according to claim 1, characterized in that, The flow control valve (26) is installed on the starch liquid pumping pipe (25) and close to the starch liquid extraction pump (23). The return control valve (27) is installed at the end of the starch liquid pumping pipe (25). A plurality of the spray nozzles (28) are located between the flow control valve (26) and the return control valve (27) and are oriented toward the roller (3).

6. The atomized spray starch sizing device for improving the coefficient of friction of kraft paper according to claim 5, characterized in that, The spray nozzle (28) is an atomizing nozzle used to atomize starch liquid and spray it onto the kraft paper web on the surface of the roll (3).

7. The atomized spray starch sizing device for improving the coefficient of friction of kraft paper according to claim 1, characterized in that, A pressure gauge (251) is also installed on the starch liquid pump pipe (25), and the pressure gauge (251) is located near the flow control valve (26).

8. The atomized spray starch sizing device for improving the coefficient of friction of kraft paper according to claim 1, characterized in that, One end of the reflux pipe (29) is connected to the reflux control valve (27), and the other end of the reflux pipe (29) is connected to the starch storage tank (21) to form a circulation loop for the starch liquid.

9. The atomized spray starch sizing device for improving the coefficient of friction of kraft paper according to claim 1, characterized in that, The spray liquid mixing and stirring mechanism (1) and the spray liquid circulating spraying mechanism (2) are integrated on the same frame, and the starch storage tank (21) is located downstream of the mixing and stirring tank (11).

10. A method for applying starch by atomization spray to improve the coefficient of friction of kraft paper, characterized in that, Includes the following steps: S1. Preparation of starch solution: In the mixing tank (11) of the spray liquid mixing and stirring mechanism (1), add the set proportion of clean water and starch through the clean water input pipe (12) and starch supply pipe (13) respectively, and then start the mixing tank (11) to stir fully to form a uniform starch solution for later use. S2, Starch liquid delivery and primary filtration: Open the starch liquid supply pipe control valve (15) to allow the mixed starch liquid to enter the starch storage tank (21) of the spray liquid circulation spraying mechanism (2) through the starch liquid supply pipe (14). The outlet of the starch liquid supply pipe (14) is aligned with the filter screen (22) above the inside of the starch storage tank (21). The flocculent clumps in the starch liquid are intercepted by the filter screen (22) to prevent subsequent blockage of the pipes and nozzles. The filtered starch liquid is stored in the starch storage tank (21) for later use. S3. Circulation pressurization and flow regulation: Start the starch liquid extraction pump (23) and extract the filtered starch liquid from the starch storage tank (21) through the starch liquid pump pipe (24). After the starch liquid is pressurized by the extraction pump (23), it is sent into the starch liquid pumping pipe (25) that is mounted above the flat roller (3). During this process, the spray flow rate is adjusted by the flow control valve (26) and the pipeline pressure is monitored by the pressure gauge (251) to ensure that the spray pressure is stable within the range required for atomization. S4. Atomized spray sizing: The starch liquid flows through several spray nozzles (28) on the starch liquid pump pipe (25). The spray nozzles (28) atomize the starch liquid and spray it evenly onto the wet paper web on the surface of the paper machine wire section roll (3), so that the atomized starch liquid forms a uniform thin layer on the paper web surface, improving the paper surface roughness and friction coefficient. S5. Excess starch liquid recirculation: The excess starch liquid that was not sprayed out during the atomization spraying in step S4 continues to flow along the starch liquid pump pipe (25) to the end recirculation control valve (27). Adjust the recirculation control valve (27) so that the excess starch liquid returns to the starch storage tank (21) through the recirculation pipe (29). The return port of the recirculation pipe (29) is also aligned with the filter screen (22) for filtration and recycling.

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