Sizing material preparation reaction tank for light printing paper production

Abstract

The invention discloses a sizing material preparation reaction tank for light printing paper production, and belongs to the technical field of printing paper sizing material preparation. Comprising a first kettle body, a volume adjusting bin, a starch filtering unit, a second kettle body, a lifting platform and a PVA feeding unit, a water supply metering pipe valve, a starch rotating discharging valve and a first stirring motor are installed at the top of the first kettle body, a first valve set and a second valve set are fixed to the top of the volume adjusting bin, and the bottom face of the volume adjusting bin is hollow; the starch filtering unit comprises a pipe section embedded with the discharging opening, and a filtering hole array is arranged on the top surface of the pipe section; the pipe section is fixed with the first kettle body through a bolt; the bottom of the pipe section is fixed with the first valve group through a flange; according to the sizing material preparation reaction tank for light printing paper production, starch, modified starch and PVA are independently prepared, sizing material heat preservation and curing are conducted through the small-volume reaction kettle according to the production takt, follow-up cleaning is convenient, and the amount of waste water is small.

Description

TECHNICAL FIELD

[0001] The present application relates to a sizing preparation reaction tank for light printing paper production, belonging to the technical field of printing paper sizing preparation. BACKGROUND

[0002] Light printing paper has a large number of capillary pores between fibers and within fibers, and the cellulose and hemicellulose that constitute the fibers contain a large amount of hydrophilic light bases, so they can absorb water or other liquids; in order to prevent the paper from being infiltrated by water or other liquids, colloidal substances or film-forming substances with liquid resistance, i.e. sizing, are added to the paper to give the paper the ability to resist liquid penetration and diffusion; the existing sizing preparation, such as the sizing preparation reaction tank for light printing paper production disclosed in Chinese Patent No. CN218393618U, includes a tank body, a motor support and an electric structure, which can reduce the difficulty of adjusting the installation height of the reaction tank according to actual installation requirements by flexibly adjusting the size of the four groups of legs of the reaction tank, thus reducing the use limitations of the sizing preparation reaction tank for light printing paper production; however, the existing reaction tank uses "PVA residues" for production, and after the sizing is heat-treated and cured, it needs to be continuously stirred, otherwise it will cause the sizing to clump, and after the sizing is heat-treated and cured, a large area of wall scraping layer will be formed inside the tank body, which is difficult to clean, and a large amount of cleaning wastewater will be generated during the cleaning of the reaction kettle, and the wastewater contains PVA residues, which is difficult to treat. SUMMARY

[0003] To solve the above problems, the present application provides a sizing preparation reaction tank for light printing paper production, which independently prepares starch, modified starch and PVA, and heat-treats and cures the sizing through a small-capacity reaction kettle according to the production rhythm, which is convenient to clean and has less wastewater.

[0004] The sizing preparation reaction tank for light printing paper production of the present application comprises: A first kettle body is provided with a water supply metering pipe valve, a starch rotary discharging valve and a first stirring motor on the top, the first stirring motor is connected with a stirring paddle in the first kettle body; a first heating jacket is installed outside the first kettle body; a discharging port is arranged at the bottom of the first kettle body; A volume adjusting bin is fixed with a first valve group and a second valve group on the top, and the bottom surface of the volume adjusting bin is hollow; A starch filtering unit comprises a pipe section fitted with the discharging port, the top surface of the pipe section is provided with an array of filter holes; the pipe section is fixed with the first kettle body through bolts; the bottom of the pipe section is fixed with the first valve group through a flange; The second vessel body has a second heating jacket installed on its exterior; the top of the second vessel body is movably fitted with the inner wall of the volume adjustment chamber; the bottom of the second vessel body is equipped with a second electric stirring paddle and a rubber material discharge valve. A lifting platform, with the bottom of the second vessel body fixed to the lifting end of the lifting platform; The PVA feeding unit includes a mixing tank with a third heating jacket installed on the outside; a diluent metering valve and a PVA adhesive metering valve are installed on the top of the mixing tank; and the bottom of the mixing tank is connected to a second valve group via a metering pump.

[0005] During operation, the water metering valve supplies a fixed amount of water to the first reactor, and the starch rotary discharge valve rotates to control the addition of a fixed amount of starch to the first reactor. Simultaneously, the first stirring motor drives the stirring paddle to rotate synchronously, achieving mixing of the fixed amount of water and starch. Before feeding the second reactor, the starch is heated to the preheating temperature through the first heating jacket. The PVA feeding unit prepares materials simultaneously, adding fixed amounts of diluent and PVA adhesive to the mixing tank through the diluent metering valve and the PVA adhesive metering valve, respectively, and performing thorough stirring and dilution. Before feeding the second reactor, the starch is heated to the preheating temperature through the third heating jacket. Next, the production of the adhesive material begins. The lifting platform drives the second vessel upward, and the top of the second vessel touches the top of the inner side of the volume adjustment chamber. Then, the first valve group is opened, and the fluid in the first vessel is poured into the second vessel through the starch filtration unit. After the second vessel is full, the first valve group is closed. Next, the lifting platform drives the second vessel downward to the set height, and the internal volume of the second vessel expands. Then, the second valve group is opened, and the metering pump metered the diluted PVA liquid in the mixing tank into the second vessel. The second electric stirring paddle is used to fully stir the mixture. After stirring, the mixture is heated for reaction, followed by heat preservation, curing, and cooling before being discharged.

[0006] Furthermore, corner brackets are fixed to the exterior of the first reactor body, the volume adjustment chamber, and the mixing tank, and the corner brackets are fixed to the adhesive preparation support.

[0007] Furthermore, the lifting platform includes an outer cylinder fixed to the bottom of the second vessel; multiple guide seats are fixed to the outside of the outer cylinder; the outer cylinder is movably embedded into the lifting platform base, a lifter is fixed inside the lifting platform base, a guide rod is slidably arranged on the guide seat, the bottom of the guide rod is fixed to the top of the lifting platform base, and a limit nut is screwed onto the top of the guide rod; the lifter drives the outer cylinder to move linearly, the outer cylinder is linearly guided by the lifting platform base, and the guide seat and guide rod are linearly guided, thereby enabling the smooth linear movement of the second vessel.

[0008] Furthermore, the lifting device is a manual jack or a hydraulic lifting platform; the second vessel body can be lifted and lowered by the hydraulic lifting platform or the manual jack.

[0009] Furthermore, a vacuum feeder is connected to the top of the starch rotary feeder via a flange. The feed end of the vacuum feeder is connected to the bottom of the starch raw material storage tank via a pneumatic conveying device. The pneumatic conveying device can send the starch in the starch raw material storage tank into the vacuum feeder. The vacuum feeder discharges the gas and retains the starch inside the vacuum feeder. The starch is then metered by the rotary feeder and a fixed amount of starch is added into the first reactor.

[0010] Furthermore, the bottom of the stirring paddle is provided with a scraping groove that fits against the top surface of the pipe section; when the stirring paddle rotates, the scraping groove of the stirring paddle can scrape the filter hole array of the pipe section, which can ensure the smoothness of the filter hole array.

[0011] Furthermore, the adhesive discharge valve is connected to the buffer tank via a pump set, and the bottom of the buffer tank is connected to the adhesive supply pipeline; however, after the adhesive inside the second reactor body cools down, the adhesive is pumped into the buffer tank via the pump set, the buffer tank is temperature controlled, and the adhesive is supplied to the adhesive application equipment via the adhesive supply pipeline.

[0012] Furthermore, when the lifting platform is at its lowest position, the top of the second vessel body is detached from the volume adjustment chamber; the bottom of the lifting platform is slidably installed with the slide rail, and the slide rail is fixed to the ground; when the second vessel body stops, the lifting platform can be lowered to its lowest position and pulled out along the slide rail to open the top surface of the second vessel body, which facilitates scraping the wall material. After scraping, the inner wall of the second vessel body is wiped and finally washed with water, which can reduce cleaning wastewater and reduce PVA residue in the wastewater.

[0013] Furthermore, a filter is installed at the inlet end of the rubber discharge pipe valve via a flange; after the second reactor completes heat preservation, curing, and cooling discharge, the produced rubber is discharged through the rubber discharge pipe valve. During discharge, the rubber is filtered through the filter to improve the smoothness of subsequent rubber application.

[0014] Furthermore, the volume of the first vessel is 10-20 times that of the second vessel. The fluid viscosity in the first vessel and the stirring tank is low, which will not cause wall scraping and clumping, and there is no need to clean them. As for the second vessel after reaction and heat preservation and curing, its volume is determined according to the cycle time of the printing paper production line. Using a small-volume second vessel results in a faster temperature response and is more energy-efficient than the "one-pot" reaction vessel. In addition, it can greatly reduce the amount of wastewater discharged.

[0015] Compared with existing technologies, the adhesive preparation reaction vessel for lightweight printing paper production of the present invention uses a first vessel to mix starch and modified starch, and preheats the mixture by injecting water and controlling the temperature, thus preventing starch from maturing and sticking to the walls. It eliminates the need for cleaning the large-volume first vessel. Simultaneously, the PVA adhesive is diluted and preheated using a stirring tank. The heating jackets of the first vessel and the stirring tank can be stopped and agitation stopped, restarting after a set time before the second vessel's material supply demand. A lower-power second electric agitator is used for continuous agitation until the cooling temperature, resulting in more energy-efficient production. After the second vessel discharges the adhesive, the first vessel and the stirring tank pump the preheated fluid into… The material is then transferred to the second reactor to prevent rapid cooling and scraping of the walls. A second electric agitator ensures thorough mixing of the materials, including any remaining material from the previous batch. The material then enters the curing and holding process. The second reactor enables dynamic temperature control of mixing, heating, curing, and cooling. Since the capacity of the second reactor is determined based on the printing paper production cycle, a small-volume reactor allows for rapid dynamic temperature response. Furthermore, during shutdown cleaning, the second reactor can be opened via a lifting platform for open scraping and cleaning, making cleaning more convenient and reducing wastewater volume, thus lowering wastewater treatment pressure. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the rubber compound preparation reaction vessel of the present invention.

[0017] Figure 2 This is a schematic diagram of the installation structure of the first vessel body, the volume adjustment chamber, the starch filtration unit, and the second vessel body of the present invention.

[0018] Figure 3 For the present invention Figure 2 A magnified schematic diagram of the structure at point A in the middle.

[0019] Figure 4 This is a schematic cross-sectional view of the volume adjustment chamber and the second vessel body after installation according to the present invention.

[0020] Figure 5 This is a schematic cross-sectional view of the lifting platform of the present invention.

[0021] Figure 6 This is a schematic diagram of the reaction vessel and slide rail installation structure for preparing the adhesive material according to the present invention.

[0022] Reference numerals: 1. First vessel body; 2. Water supply metering valve; 3. Starch rotary discharge valve; 4. First stirring motor; 5. Stirring paddle; 6. First heating jacket; 7. Volume adjustment chamber; 8. First valve group; 9. Second valve group; 10. Pipe section; 11. Filter array; 12. Second vessel body; 13. Second heating jacket; 14. Second electric stirring paddle; 15. Adhesive discharge valve; 16. Lifting platform; 17. Mixing tank; 18. Third heating jacket; 19. Diluent metering valve; 20. PVA adhesive metering valve; 21. Metering pump; 22. Adhesive preparation support; 23. Outer cylinder; 24. Guide seat; 25. Lifting platform; 26. Lifter; 27. Guide rod; 28. Vacuum feeder; 29. ​​Slide rail. Detailed Implementation

[0023] Example: like Figures 1 to 6 The shown reaction vessel for preparing adhesives for the production of lightweight printing paper includes: A first vessel body 1 is equipped with a water metering valve 2, a starch rotary feeding valve 3 and a first stirring motor 4 on its top. The first stirring motor 4 is connected to a stirring paddle 5 inside the first vessel body 1. A first heating jacket 6 is installed on the outside of the first vessel body 1. A discharge port is provided at the bottom of the first vessel body 1. The volume adjustment chamber 7 has a first valve group 8 and a second valve group 9 fixed on its top, and the bottom surface of the volume adjustment chamber 7 is hollow. A starch filtration unit includes a pipe section 10 fitted into a discharge port, the top surface of the pipe section 10 being provided with a filter hole array 11; the pipe section 10 is fixed to a first reactor body 1 by bolts; the bottom of the pipe section 10 is fixed to a first valve group 8 by a flange; The second vessel body 12 is equipped with a second heating jacket 13 on its exterior; the top of the second vessel body 12 is movably fitted with the inner wall of the volume adjustment chamber 7; the bottom of the second vessel body 12 is equipped with a second electric stirring paddle 14 and a rubber material discharge valve 15. The second vessel body 12 is made of 304 stainless steel with a polytetrafluoroethylene anti-stick layer. Its working pressure is 0.4-1.0 MPa, and its temperature range is 20-150℃. The second electric agitator 14 has an upper propeller blade with a diameter of 0.5 times the tank diameter, 3 blades, and an inclination angle of 45°; a middle turbine blade with a diameter of 0.4 times the tank diameter and 4 straight blades; and a bottom anchor scraper with a gap of ≤5mm from the tank bottom. The second heating jacket 13 uses two fluid systems for heating and cooling. The heat transfer medium is heat transfer oil, and the cooling medium is circulating water. The lifting platform 16, with the bottom of the second vessel 12 fixed to the lifting end of the lifting platform 16; The PVA feeding unit includes a mixing tank 17, with a third heating jacket 18 installed on the outside of the mixing tank 17; a diluent metering valve 19 and a PVA adhesive metering valve 20 are installed on the top of the mixing tank 17; and the bottom of the mixing tank 17 is connected to a second valve group 9 via a metering pump 21.

[0024] During operation, the water metering valve 2 supplies a fixed amount of water to the first reactor 1, and the starch rotary discharge valve 3 rotates to control the addition of a fixed amount of starch to the first reactor 1. Simultaneously, the first stirring motor 4 drives the stirring paddle 5 to rotate synchronously, achieving mixing of the fixed amount of water and starch. Before feeding the second reactor 12, the mixture is heated to the preheating temperature via the first heating jacket 6. The PVA feeding unit simultaneously prepares materials, adding fixed amounts of diluent and PVA adhesive to the mixing tank 17 via the diluent metering valve 19 and PVA adhesive metering valve 20 respectively, and then thoroughly stirring and diluting them. Before feeding the second reactor 12, the mixture is heated to the preheating temperature via the third heating jacket 18. When mixing the first reactor 1 and the mixing tank 17, the stirring speed is 50 rpm and the temperature is 25°C. During adhesive production, the... The lowering platform 16 drives the second vessel 12 upward, with the top of the second vessel 12 abutting the top of the inner side of the volume adjustment chamber 7. Then, the first valve group 8 is opened, and the fluid in the first vessel 1 is poured into the second vessel 12 through the starch filtration unit. After the second vessel 12 is full, the first valve group 8 is closed. Next, the lifting platform 16 drives the second vessel 12 downward to a set height, expanding the internal volume of the second vessel 12. Then, the second valve group 9 is opened, and the metering pump 21 meterly injects the diluted PVA liquid from the mixing tank 17 into the second vessel 12. The second electric stirring paddle 14 then thoroughly stirs the mixture. After stirring, the mixture is heated for reaction, followed by heat preservation, ripening, and cooling before discharge. During stirring and mixing, the second electric stirring paddle 14 operates at a speed of 50 rpm, a temperature of 25°C, and a stirring time of 3-5 minutes. The reaction temperature is 80℃, the stirring speed is 120 rpm, and the stirring time is 15-20 min; the heat preservation and ripening temperature is 60℃, the stirring speed is 80 rpm, and the stirring time is 10-15 min; the cooling and discharge temperature is no more than 50℃, and the stirring speed is 50 rpm.

[0025] The first vessel body 1, the volume adjustment chamber 7 and the mixing tank 17 are fixed with corner brackets on the outside, and the corner brackets are fixed to the adhesive preparation support 22.

[0026] The lifting platform 16 includes an outer cylinder 23 fixed to the bottom of the second vessel 12; multiple guide seats 24 are fixed to the outside of the outer cylinder 23; the outer cylinder 23 is movably embedded into the lifting platform 25; a lifting device 26 is fixed inside the lifting platform 25; a guide rod 27 is slidably arranged on the guide seat 24; the bottom of the guide rod 27 is fixed to the top of the lifting platform 25; and a limit nut is screwed onto the top of the guide rod 27; the lifting device 26 drives the outer cylinder 23 to move linearly; the outer cylinder 23 is linearly guided by the lifting platform 25, and linearly guided by the guide seats 24 and the guide rod 27, thereby enabling the smooth linear movement of the second vessel 12.

[0027] The lifting device 26 is a manual jack or a hydraulic lifting platform; the second vessel body 12 can be lifted and lowered by the hydraulic lifting platform or the manual jack.

[0028] The top of the starch rotary feeding valve 3 is connected to a vacuum feeder 28 via a flange. The feed end of the vacuum feeder 28 is connected to the bottom of the starch raw material storage tank via a pneumatic conveying device. The pneumatic conveying device can send the starch in the starch raw material storage tank into the vacuum feeder 28. The vacuum feeder 28 discharges the gas and retains the starch inside the vacuum feeder. The starch is then metered by the rotary feeding valve 3 and a fixed amount of starch is added into the first reactor body 1.

[0029] The bottom of the stirring paddle 5 is provided with a scraping groove that fits against the top surface of the pipe section 10; when the stirring paddle 5 rotates, the scraping groove of the stirring paddle 5 can scrape the filter hole array 11 of the pipe section 10, which can ensure the smoothness of the filter hole array 11.

[0030] The adhesive discharge valve 15 is connected to the buffer tank via a pump set, and the bottom of the buffer tank is connected to the adhesive supply pipeline. However, after the adhesive inside the second reactor 12 cools down, the adhesive is pumped into the buffer tank via the pump set. The buffer tank is temperature controlled and the adhesive is supplied to the adhesive application equipment via the adhesive supply pipeline.

[0031] When the lifting platform 16 is at its lowest position, the top of the second vessel 12 is detached from the volume adjustment chamber 7; the bottom of the lifting platform 16 is slidably installed with the slide rail 29, and the slide rail 29 is fixed to the ground; when the second vessel 12 stops, the lifting platform 16 can be lowered to its lowest position and pulled out along the slide rail 29 to open the top surface of the second vessel 12, which facilitates scraping the wall material. After scraping, the inner wall of the second vessel 12 is wiped and finally washed with water, which can reduce cleaning wastewater and reduce PVA residue in the wastewater.

[0032] The input end of the rubber discharge pipe valve 15 is equipped with a filter via a flange. After the second reactor body 12 completes heat preservation, curing, and cooling discharge, the produced rubber is discharged through the rubber discharge pipe valve 15. During discharge, the rubber is filtered through the filter to improve the smoothness of subsequent rubber application.

[0033] The volume of the first vessel 1 is 10-20 times that of the second vessel 12. The fluid viscosity in the first vessel 1 and the stirring tank 17 is low, which will not cause wall scraping and clumping, and there is no need to clean them. As for the second vessel 12 after reaction and heat preservation and maturation, its volume is determined according to the cycle of the printing paper production line. The use of a small-volume second vessel 12 results in a faster temperature response and is more energy-efficient than the "one-pot" reaction vessel. In addition, it can greatly reduce the amount of wastewater discharged.

[0034] The above embodiments are merely preferred embodiments of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present invention are included within the scope of the present invention.

Claims

1. A reaction vessel for preparing adhesives in the production of lightweight printing paper, characterized in that: include: The first vessel body has a water metering valve, a starch rotary feeding valve, and a first stirring motor installed on its top. The first stirring motor is connected to the stirring paddle inside the first vessel body. A first heating jacket is installed on the outside of the first vessel body. A discharge port is provided at the bottom of the first vessel body. A volume adjustment chamber, wherein a first valve group and a second valve group are fixed on the top of the volume adjustment chamber, and the bottom surface of the volume adjustment chamber is hollow; A starch filtration unit includes a pipe section fitted with a discharge port, the top surface of which is provided with an array of filter holes; the pipe section is fixed to a first reactor body by bolts; the bottom of the pipe section is fixed to a first valve group by a flange; The second vessel body has a second heating jacket installed on its exterior; the top of the second vessel body is movably fitted with the inner wall of the volume adjustment chamber; the bottom of the second vessel body is equipped with a second electric stirring paddle and a rubber material discharge valve. A lifting platform, with the bottom of the second vessel body fixed to the lifting end of the lifting platform; The PVA feeding unit includes a mixing tank with a third heating jacket installed on the outside; a diluent metering valve and a PVA adhesive metering valve are installed on the top of the mixing tank; and the bottom of the mixing tank is connected to a second valve group via a metering pump.

2. The adhesive preparation reaction vessel for lightweight printing paper production according to claim 1, characterized in that: The first reactor body, the volume adjustment chamber and the mixing tank are fixed with corner brackets on the outside, and the corner brackets are fixed to the rubber preparation support.

3. The adhesive preparation reaction vessel for lightweight printing paper production according to claim 1, characterized in that: The lifting platform includes an outer cylinder fixed to the bottom of the second vessel body; multiple guide seats are fixed to the outside of the outer cylinder; the outer cylinder is movably embedded into the lifting platform base; a lifting device is fixed to the inside of the lifting platform base; a guide rod is slidably arranged on the guide seat; the bottom of the guide rod is fixed to the top of the lifting platform base; and a limit nut is screwed onto the top of the guide rod.

4. The adhesive preparation reaction vessel for lightweight printing paper production according to claim 3, characterized in that: The lifting device is a manual jack or a hydraulic lifting platform.

5. The adhesive preparation reaction vessel for lightweight printing paper production according to claim 1, characterized in that: The top of the starch rotary discharge valve is connected to a vacuum feeder via a flange, and the feed end of the vacuum feeder is connected to the bottom of the starch raw material storage tank via a pneumatic conveying device.

6. The adhesive preparation reaction vessel for lightweight printing paper production according to claim 1, characterized in that: The bottom of the agitator is provided with a scraper groove that fits against the top surface of the pipe section.

7. The adhesive preparation reaction vessel for lightweight printing paper production according to claim 1, characterized in that: The adhesive discharge valve is connected to the buffer tank via a pump unit, and the bottom of the buffer tank is connected to the adhesive supply pipeline.

8. The adhesive preparation reaction vessel for lightweight printing paper production according to claim 1, characterized in that: When the lifting platform is at its lowest position, the top of the second vessel body is detached from the volume adjustment chamber; the bottom of the lifting platform is slidably installed with the slide rail, and the slide rail is fixed to the ground.

9. The adhesive preparation reaction vessel for lightweight printing paper production according to claim 1, characterized in that: A filter is installed at the inlet end of the rubber discharge pipe valve via a flange.

10. The adhesive preparation reaction vessel for lightweight printing paper production according to claim 1, characterized in that: The volume of the first vessel is 10-20 times that of the second vessel.

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