Papermaking filling method based on calcium carbonate wrapping

Abstract

The invention discloses a papermaking filling method based on calcium carbonate wrapping, and relates to the technical field of papermaking filling, and the papermaking filling method comprises the following steps: S1, mixing heavy calcium carbonate and precipitated calcium carbonate according to a ratio, and conveying the mixture into mixing equipment; s2, two drugs DEV310 and DEV210 are selected as filler wrapping agents, the papermaking filling method based on calcium carbonate wrapping comprises the steps that ground calcium carbonate and precipitated calcium carbonate are mixed in proportion and then enter filler wrapping agent mixing equipment, then dissolved DEV210 and DEV210 absolute dry filler are input into the mixing equipment according to needs, calcium carbonate filler is subjected to wrapping treatment, and the calcium carbonate filler is filled with the filler wrapping agent. Compared with a conventional filler adding method, the specific surface area of the treated filler is reduced, and bonding points between fibers are increased, so that filler retention and paper strength are improved, filler retention can be improved by 2-3%, paper quality is improved, paper cost can be reduced, and economic benefits are considerable.

Description

Technical Field

[0001] The invention relates to the technical field of papermaking filling, in particular to a papermaking filling method based on calcium carbonate encapsulation. Background Art

[0002] In the modern papermaking industry, the use of fillers is one of the key means to improve paper performance and reduce costs. Calcium carbonate, as a common papermaking filler, is usually used to improve the whiteness, smoothness, glossiness of paper and reduce the cost of paper. However, traditional calcium carbonate fillers are directly added to the web mixer of the paper machine without treatment. Due to the large specific surface area of ​​calcium carbonate fillers, it is easy to cause a large filler loss rate. The amount of filler left on the paper is low, only 20-23%, which will eventually affect the quality and performance of the paper. Summary of the invention

[0003] In view of the shortcomings of the prior art, the present invention provides a papermaking filling method based on calcium carbonate encapsulation, which solves the problem that the traditional calcium carbonate filler is directly added to the paper machine mesh mixer without being treated. Due to the large specific surface area of ​​the calcium carbonate filler, it is easy to cause a large filler loss rate and a low amount of filler retained on the paper.

[0004] To achieve the above objectives, the present invention is implemented by the following technical scheme: a papermaking filling method based on calcium carbonate encapsulation comprises the following steps: S1. Mixing heavy calcium carbonate and precipitated calcium carbonate in proportion to form a filler, and conveying it to a mixing device; S2, select DEV310 and DEV210 as filler encapsulating agents, and transport the two drugs to two dissolving devices respectively, and dissolve them with water at a ratio of 1:200; S3, introducing ultra-clear filtrate into the mixing device to dilute the filler; S4, the dissolved DEV310 and DEV210 solutions are filtered through a filter, measured by a weighing frame, and then transported to a mixing device; S5. The filler wrapping agent is mixed with the filler, and the treated filler is then transported to the web mixer and enters the paper machine system.

[0005] Preferably, a frame is provided below the two dissolving devices, the weighing frame is arranged at the bottom of the inner wall of the frame through a base, a weighing sensor is arranged on the top of the base, a filtering channel is arranged above the weighing frame, and the surface of the filtering channel is connected to the inner wall of the frame through a driving mechanism, and a discharge pipe is arranged at the bottom of the dissolving device and directly above the filtering channel.

[0006] Preferably, the filter is fixedly arranged on the upper side of the inner wall of the filter channel, a driving motor is fixedly connected to the lower side of the filter channel surface, and a rotating shaft is fixedly connected to the output end of the driving motor, and a sealing plate is fixedly connected to the surface of the rotating shaft and located inside the filter channel.

[0007] Preferably, a support frame is fixedly connected to the surface of the filter channel, and a tooth plate is slidably provided on the inner side of the support frame, a groove is provided at the bottom of the tooth plate, an electric push rod is fixedly connected to the bottom of the inner side of the support frame, and the output end of the electric push rod is fixedly connected to the inner wall of the groove, and a knocking assembly is provided on the front side of the tooth plate.

[0008] Preferably, the knocking assembly includes a rotating shaft, one end of the rotating shaft located outside the filter channel is fixedly connected to a gear meshing with the tooth plate, the surface of the rotating shaft is fixedly connected to a support rod, and the bottom of the support rod is fixedly connected to a sphere.

[0009] Preferably, a waste frame is movably provided at the bottom of the inner wall of the frame, and fixing rods are fixedly connected to the front and rear sides of the filter channel. The driving mechanism includes a screw assembly fixed to the inner wall of the frame, and a servo motor is fixedly provided on the surface of the screw assembly through a connecting rod, and the output end of the servo motor is connected to the fixing rod.

[0010] Preferably, the dissolving equipment and the mixing equipment both include an outer cylinder, an inner cylinder, a stirring assembly and a temperature control assembly, the stirring assembly includes a first motor, the output end of the first motor is fixedly connected to a stirring shaft, and blades are fixedly connected to both sides of the stirring shaft through a bracket, a plurality of through holes are opened on the surface of the blades, and an L-shaped scraper is fixedly provided on one side of the stirring shaft.

[0011] Preferably, the temperature control component includes a cooling coil fixed on the outer surface of the inner cylinder, a plurality of heating plates are fixedly arranged on the outer surface of the inner cylinder and in the gaps between the cooling coil, and a temperature sensor is arranged on the top of the outer cylinder.

[0012] Preferably, a water pump is provided on one side of the frame, and the liquid inlet of the water pump is connected to one side of the weighing frame through a liquid outlet pipe, the liquid outlet of the water pump is connected to a mixing device through a liquid inlet pipe, and a filling pipe is connected to the top of the mixing device.

[0013] The present invention provides a papermaking filling method based on calcium carbonate encapsulation. It has the following beneficial effects: (1) The papermaking filling method based on calcium carbonate encapsulation is to mix ground calcium carbonate (GCC) and precipitated calcium carbonate (PCC) in proportion, and then put them into a filler encapsulating agent mixing device, and then, according to the needs, the dissolved DEV210 and DEV310 absolute dry fillers are input into the mixing device to encapsulate the calcium carbonate filler. Compared with the conventional filler adding method, the filler treated by the present invention has a reduced specific surface area, and the bonding points between fibers are increased, thereby improving filler retention and paper strength, and can increase filler retention by 2-3%, improve paper quality, and reduce paper costs, with considerable economic benefits.

[0014] (2) In the papermaking filling method based on calcium carbonate encapsulation, after the absolute dry fillers DEV210 and DEV310 are dissolved, the impurities and crystals in the solution are first filtered through a filter screen, and then the amount of addition is measured by a weighing sensor according to the amount to be added. When the target weight is reached, it can be input into the mixing equipment through a water pump, making the addition control of the encapsulating agent more precise, improving the stability and reliability of the filler encapsulation technology, ensuring that the encapsulation effect of each batch of fillers reaches the best state, and improving production efficiency.

[0015] (3) In the papermaking filling method based on calcium carbonate encapsulation, during the process of the filter screen filtering the encapsulating agent, the filter channel can be driven by the driving mechanism to move to the top of the waste frame, and then flipped downward, so that the impurities and crystals on the filter screen are automatically discharged into the waste frame. Combined with the setting of the knocking component, the filter screen can be cleaned quickly and thoroughly, thereby improving the cleaning effect and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a cross-sectional view of the dissolution equipment structure of the present invention; Figure 3 It is a schematic diagram of the installation of the cooling coil structure of the present invention; Figure 4 is a cross-sectional view of the frame structure of the present invention; Figure 5 It is a schematic diagram of the flipping of the filter channel structure of the present invention; Figure 6 For the present invention Figure 4 A partial enlarged view of the middle A; Figure 7 is a cross-sectional view of the tooth plate structure of the present invention; Figure 8 is a cross-sectional view of the filter channel structure of the present invention; Fig. 9 It is a schematic diagram of the knocking component structure of the present invention.

[0017] In the figure: 1, mixing device; 2, filter screen; 3, weighing frame; 4, frame; 5, base; 6, weighing sensor; 7, filter channel; 8, discharge pipe; 9, drive motor; 10, rotating shaft; 11, sealing plate; 12, support frame; 13, tooth plate; 14, groove; 15, electric push rod; 16, knocking assembly; 161, rotating shaft; 162, gear; 163, support rod; 164, ball; 17, waste frame; 18, solid Fixed rod; 19, screw rod assembly; 20, servo motor; 21, outer cylinder; 22, inner cylinder; 23, stirring assembly; 231, first motor; 232, stirring shaft; 233, bracket; 234, blade; 235, through hole; 236, L-shaped scraper; 24, temperature control assembly; 241, cooling coil; 242, heating plate; 243, temperature sensor; 25, water pump; 26, liquid outlet pipe; 27, liquid inlet pipe; 28, filling pipe. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Embodiment 1

[0019] The present invention provides a papermaking filling method based on calcium carbonate encapsulation, comprising the following steps: S1, mixing ground calcium carbonate (GCC) and precipitated calcium carbonate (PCC) in a ratio of 10%-40% of PCC, and conveying the mixture to a mixing device 1; S2. Select DEV310 and DEV210 as filler wrappers, and transport the two drugs to two dissolving devices respectively, and dissolve them with water at a ratio of 1:200. When the drugs are dissolved, the water temperature should be controlled between 20 and 40 degrees. If the temperature is too low, the drug will dissolve slowly and the drug efficiency will be low. Because there are emulsifier components in the drugs, the temperature will exceed 45 degrees and reach the turbidity point, resulting in more crystals in the drug filter after dissolution. S3, introducing ultra-clear filtrate into the mixing device 1 to dilute the filler so that the mass percentage of the filler in the total mixture is 20%; S4, after the dissolved DEV310 and DEV210 solutions are filtered through the filter screen 2 and measured by the weighing frame 3, they are transported to the mixing device 1, wherein the amount of DEV310 added is 0.5-1.0kg / t of absolute dry filler, and the amount of DEV210 added is 1.5-2.0kg / t of absolute dry filler, and they are added evenly at the same time; S5. The filler wrapping agent is mixed with the filler, and the treated filler is then transported to the web mixer and enters the paper machine system. After the wrapping treatment, the average particle size increases from 2um to 36-40um, thereby reducing the filler specific surface area, increasing the bonding points between fibers, and improving the filler retention and paper strength; Among them, DEV210 and DEV310 are both medium molecular weight cationic polymers. DEV210 focuses on increasing the particle size of calcium carbonate, while DEV310 focuses on neutralizing the system charge, making the particle size of calcium carbonate after encapsulation more uniform. The treated calcium carbonate can improve the retention of fillers, improve paper strength and reduce the interference of heavy calcium carbonate with other wet-end chemicals. Embodiment 2

[0020] Based on Example 1, please refer to Figure 1 , Figure 4 and Figure 8 As shown, the specific improvements are as follows: a water pump 25 is provided on one side of the frame 4 for conveying the DEV210 and DEV310 dissolved liquids to the mixing device 1, and the liquid inlet of the water pump 25 is connected to one side of the weighing frame 3 through a liquid outlet pipe 26, and the liquid outlet of the water pump 25 is connected to the mixing device 1 through a liquid inlet pipe 27, and the top of the mixing device 1 is connected to a packing pipe 28, and an ultra-clear filtrate pipe is also provided; A frame 4 is provided below the two dissolving devices, and a weighing frame 3 is arranged at the bottom of the inner wall of the frame 4 through a base 5. A weighing sensor 6 is provided on the top of the base 5 for measuring the amount of filler wrapping agent added. A filtering channel 7 is provided above the weighing frame 3, and the surface of the filtering channel 7 is connected to the inner wall of the frame 4 through a driving mechanism. A discharge pipe 8 is provided at the bottom of the dissolving device and directly above the filtering channel 7. A solenoid valve is provided inside the discharge pipe 8 and is controlled by an external control system. The filter screen 2 is fixedly provided on the upper side of the inner wall of the filtering channel 7, and a driving motor 9 is fixedly connected to the lower side of the surface of the filtering channel 7, and a rotating shaft 10 is fixedly connected to the output end of the driving motor 9. One end of the rotating shaft 10 passes through the interior of the filtering channel 7 and is rotatably connected to its inner wall. A sealing plate 11 is fixedly connected to the surface of the rotating shaft 10 and located inside the filtering channel 7, and the shape of the sealing plate 11 is adapted to the inner wall of the filtering channel 7.

[0021] Through the arrangement of the above structure, the impurities and crystals in the solution are first filtered through the filter screen 2, and then according to the amount to be added, in conjunction with the arrangement of the drive motor 9 and the sealing plate 11, the added amount of the filtered solution is measured by the weighing sensor 6. When the target weight is reached, it can be input into the mixing device 1 through the water pump 25, so that the addition control of the encapsulating agent is more precise, thereby improving the stability and reliability of the filler encapsulation technology. Embodiment 3

[0022] In conjunction with Example 1 and Example 2, please refer to Figures 4 to 9 As shown, the specific improvements are as follows: a support frame 12 is fixedly connected to the surface of the filter channel 7, and a toothed plate 13 is slidably provided on the inner side of the support frame 12, a groove 14 is provided at the bottom of the toothed plate 13, an electric push rod 15 is fixedly connected to the bottom of the inner side of the support frame 12, and the output end of the electric push rod 15 is fixedly connected to the inner wall of the groove 14, a knocking assembly 16 is provided on the front side of the toothed plate 13, the knocking assembly 16 includes a rotating shaft 161 rotatably connected to the inner wall of the filter channel 7, one end of the rotating shaft 161 passes through the outside of the filter channel 7 and is rotatably connected to the surface of the filter channel 7 through a mounting plate, one end of the rotating shaft 161 located outside the filter channel 7 is fixedly connected to a gear 162 meshing with the toothed plate 13, a plurality of support rods 163 are fixedly connected to the surface of the rotating shaft 161, and a ball 164 is fixedly connected to the bottom of the support rod 163; A waste frame 17 is movably provided at the bottom of the inner wall of the frame 4, and a fixing rod 18 is fixedly connected to both the front and rear sides of the filter channel 7. The driving mechanism includes a screw assembly 19 fixed to the inner wall of the frame 4, and a servo motor 20 is fixedly provided on the surface of the screw assembly 19 through a connecting rod, and the output end of the servo motor 20 is connected to the fixing rod 18 on the rear side, and the fixing rod 18 on the front side is slidably connected to the inner wall of the frame 4 through a slider, and the fixing rod 18 and the slider are rotationally connected; The screw assembly is a prior art, and is generally composed of a motor, a screw, a nut, a nut seat and other structures, and is used to drive the filter channel 7 to perform linear reciprocating motion.

[0023] Through the setting of the above-mentioned structure, during the use of the filter 2, the screw assembly 19 can drive the filter channel 7 to move to the top of the waste frame 17, and then the servo motor 20 drives the filter channel 7 to flip downward, so that the impurities and crystals remaining on the filter 2 fall into the waste frame 17, and with the setting of the knocking assembly 16 and other structures, the filter 2 is knocked to shake out the impurities blocked in the filter holes, so that the cleaning of the filter 2 is more thorough. Embodiment 4

[0024] In conjunction with Embodiments 1 to 3, please refer to Figures 1 to 3As shown, the specific improvements are as follows: the dissolving device and the mixing device 1 both include an outer cylinder 21, an inner cylinder 22 fixed to the top of the inner wall of the outer cylinder 21, a stirring assembly 23 and a temperature control assembly 24, the stirring assembly 23 includes a first motor 231, the first motor 231 is fixedly arranged on the top of the dissolving device and the mixing device 1, the output end of the first motor 231 is fixedly connected to a stirring shaft 232 that penetrates the inner cylinder 22, the bottom end of the stirring shaft 232 is rotatably connected to the bottom of the inner wall of the inner cylinder 22, and the stirring shaft 232 is connected to the inner wall of the inner cylinder 22. Both sides of the stirring shaft 232 are fixedly connected with blades 234 through brackets 233. There are multiple blades 234 with a large surface area, which increases the contact area with the solution and makes the stirring more complete. The surface of the blades 234 is provided with a plurality of through holes 235, which can allow the solution to pass through during stirring, thereby improving the shearing effect and making the mixing more uniform. An L-shaped scraper 236 is fixedly provided on one side of the stirring shaft 232, and the L-shaped scraper 236 scrapes the material adhered to the inner wall of the inner cylinder 22 to avoid waste of the material. The temperature control component 24 includes a cooling coil 241 fixed on the outer surface of the inner cylinder 22. The water inlet and outlet ends of the cooling coil 241 both penetrate the outside of the outer cylinder 21 and are connected to the external water supply mechanism. A plurality of heating plates 242 are fixedly arranged on the outer surface of the inner cylinder 22 and in the gaps of the cooling coil 241. A temperature sensor 243 is arranged on the top of the outer cylinder 21 for detecting the temperature inside the inner cylinder 22.

[0025] By setting the above structure, the materials in the dissolving device and the mixing device 1 can be evenly mixed, and the temperature during mixing can be accurately controlled, so that the processing of the filler reaches the best state and the production efficiency is improved.

[0026] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art, and the model parameters of each electrical appliance are not specifically limited, and conventional equipment compatible with the equipment can be used.

[0027] When in use, DEV210 absolute dry filler and DEV310 absolute dry filler are respectively put into two dissolving devices, and DEV210 and DEV310 are dissolved with water at a ratio of 1:200. By starting the first motor 231, the stirring shaft 232 is driven to rotate, and the stirring shaft 232 drives several blades 234 to fully stir the solution. The L-shaped scraper 236 rotates accordingly, and the material adhering to the inner wall can be scraped off during stirring. While stirring, the heating plate 242 heats the solution in the inner cylinder 22, and the cooling coil 241 is connected to the external water supply mechanism to cool the solution. The two cooperate to control the water temperature in the range of 20 to 40 degrees. The dissolved DEV210 and DEV310 enter the filtering channel 7 below through the discharge pipe 8, and the filter screen 2 filters the impurities and crystals in the solution. By starting the driving motor 9, the sealing plate 11 is driven to rotate, and the filtering channel 7 can be opened, so that the filtered encapsulating agent solution can be discharged into the weighing frame 3. The opening angle of the sealing plate 11 can control the speed and amount of discharge. After the encapsulating agent solution enters the weighing frame 3, the added amount is measured by the weighing sensor 6. When the target weight is reached, the external control system controls the driving motor 9 to drive the sealing plate 11 to close the filtering channel 7, and respectively inputs the DEV210 and DEV310 in the weighing frame 3 into the mixing device 1 through the water pump 25, and is fully mixed with the filler inside the mixing device 1. The treated filler is then transported to the web mixer to enter the paper machine system; During use of the filter 2, the filter channel 7 can be driven to move to the top of the waste frame 17 through the screw assembly 19, and then the servo motor 20 drives the filter channel 7 to flip downward, so that the impurities and crystals remaining on the filter 2 fall into the waste frame 17, and the electric push rod 15 is started to drive the tooth plate 13 to slide up and down, and the tooth plate 13 drives the gear 162 to rotate back and forth. The gear 162 can drive the ball 164 to move up and down through the rotating shaft 161, and knock the filter 2 to shake out the impurities blocked in the filter hole, so that the filter 2 can be cleaned more thoroughly.

[0028] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A papermaking filling method based on calcium carbonate encapsulation, characterized in that: The following steps are involved: S1, mixing heavy calcium carbonate and precipitated calcium carbonate in proportion to form a filler, and conveying the filler to a mixing device (1); S2, select DEV310 and DEV210 as filler encapsulating agents, and transport the two drugs to two dissolving devices respectively, and dissolve them with water at a ratio of 1:200; S3, introducing ultra-clear filtrate into the mixing device (1) to dilute the filler; S4, the dissolved DEV310 and DEV210 solutions are filtered through a filter (2), measured by a weighing frame (3), and then transported to a mixing device (1); S5. The filler wrapping agent is mixed with the filler, and the treated filler is then transported to the web mixer and enters the paper machine system.

2. The method for papermaking and filling based on calcium carbonate encapsulation according to claim 1, characterized in that: A frame (4) is provided below the two dissolving devices; the weighing frame (3) is arranged at the bottom of the inner wall of the frame (4) via a base (5); a weighing sensor (6) is provided on the top of the base (5); a filtering channel (7) is provided above the weighing frame (3); and the surface of the filtering channel (7) is connected to the inner wall of the frame (4) via a driving mechanism; a discharge pipe (8) is provided at the bottom of the dissolving device and directly above the filtering channel (7).

3. The method for papermaking and filling based on calcium carbonate encapsulation according to claim 1, characterized in that: The filter screen (2) is fixedly arranged on the upper side of the inner wall of the filter channel (7), a drive motor (9) is fixedly connected to the lower side of the surface of the filter channel (7), and a rotating shaft (10) is fixedly connected to the output end of the drive motor (9), and a sealing plate (11) is fixedly connected to the surface of the rotating shaft (10) and located inside the filter channel (7).

4. The method for papermaking and filling based on calcium carbonate encapsulation according to claim 2, characterized in that: A support frame (12) is fixedly connected to the surface of the filter channel (7), and a tooth plate (13) is slidably arranged on the inner side of the support frame (12), a groove (14) is provided at the bottom of the tooth plate (13), an electric push rod (15) is fixedly connected to the bottom of the inner side of the support frame (12), and a knocking assembly (16) is arranged on the front side of the tooth plate (13).

5. The method for papermaking and filling based on calcium carbonate encapsulation according to claim 4, characterized in that: The knocking assembly (16) comprises a rotating shaft (161), one end of the rotating shaft (161) located outside the filter channel (7) is fixedly connected to a gear (162) meshing with the tooth plate (13), a support rod (163) is fixedly connected to the surface of the rotating shaft (161), and a sphere (164) is fixedly connected to the bottom of the support rod (163).

6. The method for papermaking and filling based on calcium carbonate encapsulation according to claim 2, characterized in that: A waste frame (17) is movably provided at the bottom of the inner wall of the frame (4); fixed rods (18) are fixedly connected to the front and rear sides of the filtering channel (7); the driving mechanism comprises a screw assembly (19) fixed to the inner wall of the frame (4); a servo motor (20) is fixedly provided on the surface of the screw assembly (19) via a connecting rod; and an output end of the servo motor (20) is connected to the fixed rod (18).

7. The method for papermaking and filling based on calcium carbonate encapsulation according to claim 1, characterized in that: The dissolving device and the mixing device (1) both comprise an outer cylinder (21), an inner cylinder (22), a stirring assembly (23) and a temperature control assembly (24); the stirring assembly (23) comprises a first motor (231); an output end of the first motor (231) is fixedly connected to a stirring shaft (232); blades (234) are fixedly connected to both sides of the stirring shaft (232) via brackets (233); a plurality of through holes (235) are formed on the surface of the blades (234); and an L-shaped scraper (236) is fixedly provided on one side of the stirring shaft (232).

8. The method for papermaking and filling based on calcium carbonate encapsulation according to claim 7, characterized in that: The temperature control component (24) comprises a cooling coil (241) fixed on the outer surface of the inner cylinder (22), a plurality of heating plates (242) are fixedly arranged on the outer surface of the inner cylinder (22) and in the gaps between the cooling coil (241), and a temperature sensor (243) is arranged on the top of the outer cylinder (21).

9. The method for papermaking and filling based on calcium carbonate encapsulation according to claim 2, characterized in that: A water pump (25) is provided on one side of the frame (4), and a liquid inlet of the water pump (25) is connected to one side of the weighing frame (3) via a liquid outlet pipe (26), and a liquid outlet of the water pump (25) is connected to the mixing device (1) via a liquid inlet pipe (27), and a filler pipe (28) is connected to the top of the mixing device (1).

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