Electrostatic base paper and manufacturing method thereof

Abstract

The present invention discloses an electrostatic base paper and a method for manufacturing the same, relating to the technical field of electrostatic base paper manufacturing. The gluing mechanism includes a frame. The frame is provided with an upper roller for applying glue to the front surface of the base paper. A first hopper is fixedly connected to the frame, a feed assembly is provided on the first hopper, and an adjustable lower roller is provided on the first hopper. Both the upper and lower rollers are capable of rotating. The present invention utilizes the coordinated use of the upper and lower rollers and the feed assembly to apply glue to both sides of the paper, thereby improving the surface bonding strength of the paper.

Description

Technical Field

[0001] The invention belongs to the technical field of electrostatic base paper manufacturing, in particular to an electrostatic base paper and a manufacturing method thereof. Background Art

[0002] At present, the electrostatic copy paper on the market mainly has the following technical difficulties:

[0003] 1. Poor Flatness: The flatness of electrostatic copy paper is crucial for printing and copying results. Poor paper flatness not only affects printing quality but can also cause problems such as paper jams. This can be caused by improper process control during the paper production process or an inappropriate raw material ratio. 2. Excessive Bias: Bias refers to the difference in texture, color, gloss, and other aspects between the front and back of the paper. Excessive bias can affect the uniformity and consistency of printing or copying. This can be caused by uneven heating or stress on both sides of the paper during the production process. 3. Poor Printing Performance: Printing performance refers to the smoothness of paper as it passes through the printer or copier. Poor printing performance can cause problems such as paper jams and multiple feeds. This can be caused by physical properties such as paper stiffness, thickness, or surface friction not meeting the equipment's requirements. 4. Poor Evenness: Evenness refers to the uniformity of fiber distribution on the paper's surface. Poor evenness can cause problems such as speckling and streaking in prints or copies. This can be caused by unstable raw material quality, improper production process control, or the use of inappropriate fillers.

[0004] 5. Poor adaptability: Adaptability refers to the paper's compatibility with different printing or copying devices. Poor adaptability may result in poor printing or copying results on certain devices. This may be due to a mismatch between the paper's physical properties (such as thickness, stiffness, surface roughness, etc.) and the device's requirements.

[0005] In addition, Chinese patent publication number CN210826926U discloses a paper surface sizing machine, comprising a movable platform and a glue hopper located within its inner cavity. The movable platform inner cavity is provided with a transmission shaft, a conveyor belt, and a driven shaft. A motor is fixedly welded to its outer wall. The transmission shaft passes through the side wall of the movable platform and is in transmission connection with the motor. The conveyor belt and transmission shaft are located on either side of the driven shaft, and the two sides of the conveyor belt are in transmission connection with the two sides of the movable platform inner cavity. The inner cavity of the movable platform is provided with multiple sets of evenly arranged horizontal brackets, the center of the inner cavity is provided with a horizontal shaft and a roller, and the top wall of the movable platform is provided with vertical slots on both sides. This paper surface sizing machine is provided with horizontal brackets, mounting seats, and positioning wheels. When the paper moves on the conveyor belt, it will contact the positioning wheels below the multiple sets of horizontal brackets, so that the paper is flattened on the conveyor belt, so that the paper is almost not warped, thereby improving the effect of gluing on the paper. However, the existing device has defects in use. The existing device can only apply glue to one side of the paper, and the surface bonding strength performance of the paper needs to be improved. Summary of the Invention

[0006] The present invention aims to solve the technical problems existing in the prior art; to this end, the present invention provides an electrostatic base paper and a manufacturing method thereof.

[0007] The purpose of the present invention can be achieved through the following technical solutions:

[0008] An electrostatic base paper and a manufacturing method thereof, comprising the following steps:

[0009] Step 1: Use a pulper to break up the raw materials, use a conical refiner to beat the pulp to obtain a pulped slurry, and then proportion the slurry to prepare double-collagen paper.

[0010] Step 2: prepare glue solution and filter the glue solution, and use a glue applying mechanism to apply glue to the front and back sides of the base paper.

[0011] Step 3: Dry the base paper after sizing, and then calender it through a super calender to improve the surface smoothness and strength of the paper.

[0012] The glue applying mechanism includes a frame;

[0013] The frame is provided with an upper roller for applying glue to the front side of the base paper, the frame is fixedly connected to a hopper 1, the hopper 1 is provided with a feeding assembly, the hopper 1 is provided with an adjustable lower roller, and the upper roller and the lower roller are both rotatable;

[0014] The frame is fixedly connected to the second silo, the upper roller is attached to the discharge port of the second silo, and the bottom of the first silo is fixedly connected to a fixed frame;

[0015] The feeding assembly includes an electric push rod 1 fixedly connected to a fixed frame, an output end of the electric push rod 1 is fixedly connected to a piston, the piston is slidably connected to the silo 1, and the top of the piston is set to be concave;

[0016] The first silo is provided with a fixed seat that can move up and down, and one side of the first silo is fixedly connected to a second electric push rod, and the second electric push rod is fixedly connected to a connecting plate for driving the fixed seat to move;

[0017] The front and back of the silo are fixedly connected to a bottom plate, the top of the bottom plate is rotatably connected to a screw rod, the screw rod is threadedly connected to the fixed seat, the fixed seat is rotatably connected to the lower roller, and the fixed seat is provided with a motor 2 for driving the lower roller to rotate, a rack is fixedly connected to the connecting plate, and the outer surface of the screw rod is fixedly connected to a gear meshing with the rack.

[0018] As a further solution of the present invention: two support rods are fixedly connected to one side of the silo, and the two support rods are slidably connected to the connecting plate.

[0019] As a further solution of the present invention: a groove 1 is provided on one side of the top of the silo 1, and the groove 1 is composed of a trough body 1 and a trough body 2. The bottom of the trough cavity of the trough body 1 is set to be an inclined surface. A card groove 1 connected to the groove 1 is provided on the silo 1, and a positionable baffle 1 is provided in the groove 1, and the baffle 1 is slidably connected to the groove 1.

[0020] As a further solution of the present invention: a limiting plate 1 is fixedly connected to the baffle 1, and the limiting plate 1 is slidably connected to the clamping slot 1.

[0021] As a further solution of the present invention: a groove 2 is provided on the top of the second silo, a card slot 2 connected to the second groove is provided on the first silo, a positionable baffle 2 is provided in the second groove, and the baffle 2 is slidably connected to the second groove, a limiting plate 2 is fixedly connected to the second baffle, and the limiting plate 2 is slidably connected to the second card slot.

[0022] The invention also discloses an electrostatic base paper, comprising a base paper body, with glue layers bonded to both sides of the base paper body.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. This application can effectively solve the problems of electrostatic copy paper in terms of flatness, two-side difference, machine performance, uniformity and adaptability through comprehensive improvement measures in the process.

[0025] 2. This application uses the upper roller, the lower roller and the feeding assembly to apply glue to both sides of the paper, thereby improving the surface bonding strength performance of the paper.

[0026] 3. This application uses the electric push rod 2, the connecting plate, the screw rod, the rack and the gear to adjust the height of the lower roller, which is not only beneficial for placing the paper, but also for gluing paper of different thicknesses. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a first perspective stereogram of the present invention;

[0028] Figure 2 is a second perspective stereogram of the present invention;

[0029] Figure 3 A perspective view of the first silo, the lower roller, and the feeding assembly of the present invention;

[0030] Figure 4 This is a three-dimensional cross-sectional view of a silo 1 according to the present invention;

[0031] Figure 5 A perspective view of the first silo and the feeding assembly of the present invention;

[0032] Figure 6 For the present invention Figure 5 A partial enlarged view of point A in the middle;

[0033] Figure 7 This is a three-dimensional cross-sectional view of the second silo of the present invention;

[0034] Figure 8 This is a disassembled diagram of the second silo and the second baffle of the present invention;

[0035] Figure 9 It is a structural schematic diagram of the base paper body of the present invention.

[0036] In the figure: 1. Frame; 2. Upper roller; 3. Hopper 1; 4. Feeding assembly; 41. Electric push rod 1; 42. Piston; 5. Lower roller; 6. Hopper 2; 7. Fixed frame; 8. Motor 1; 9. Fixed seat; 10. Electric push rod 2; 11. Connecting plate; 12. Bottom plate; 13. Screw rod; 14. Motor 2; 15. Rack; 16. Gear; 17. Support rod; 18. Groove 1; 19. Slot 1; 20. Baffle 1; 21. Iron plate 1; 22. Iron plate 2; 23. Limiting plate 1; 24. Magnetic plate 1; 25. Groove 2; 26. Slot 2; 27. Baffle 2; 28. Limiting plate 2; 29. ​​Magnetic plate 2; 30. Iron plate 3; 31. Iron plate 4; 32. Base paper; 33. Glue layer. DETAILED DESCRIPTION

[0037] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. Example 1

[0038] See also Figures 1-8 As shown, the present application provides an electrostatic base paper and a method for manufacturing the same, comprising the following steps:

[0039] Step 1: crushing the raw materials with a pulper, beating the pulp with a conical refiner to obtain a pulped slurry, and then proportioning the slurry to prepare a double-collage base paper;

[0040] Specifically:

[0041] Refining: Bleached kraft softwood pulp boards and bleached kraft hardwood pulp boards were broken in pulpers respectively. Chemical thermomechanical pulp was provided by our pulp mill. NBKP, LBKP and BCTMP were all beaten with RF-4i conical refiner. The NBKP refining line used three conical refiners in series (one line). The first and second used JC04-LF type refiners, and the third used JC04-MXF type refiner. The LBKP refining line used two conical refiners in series (three lines). The first used JC04-SF type refiner, and the second used JC04-MF type refiner. The BCTMP refining line used two conical refiners in series (one line). The first used JC04-SF type refiner, and the second used JC04-MF type refiner. The pulped slurry was obtained with pulping quality and freeness: NBKP: 330±20 LBKP: 390±10 BCTMP: 300±20; wet weight of mixed slurry: NBKP: 11.5g LBKP: 1.5g BCTMP: 1.3g.

[0042] papermaking:

[0043] The pulp is made up of 15% bleached kraft softwood pulp, 50% bleached kraft broadleaf pulp and 35% wet pulp of thermo-mechanical poplar wood; GCC:PCC=1:1, solid content 43%, relative pulp absolute dry ratio 160kg / ton pulp; CPAM450ppm / ton pulp, APAM400ppm / ton pulp, silica 4kg / ton pulp, dye 100ppm / ton pulp, dye 85ppm / ton pulp, disulfonic OBA 15kg / ton pulp, PAC 5kg / ton pulp, cationic corn starch 13kg / ton pulp, ASA 1.1kg / ton pulp is mixed evenly and passed through a Valmet double-nip roller vertical nip former and a Voith forming wire to form wet paper. It is then dewatered by a Valmet double shoe press, dried on a Voith felt, dried on a single-row dryer, dried on an Aston Johnson dryer fabric, and subjected to a double-circulation steam recovery system with a main steam pressure of 3.5bar before drying to produce double-collagen base paper. The machine speed is 1700m / min.

[0044] Step 2: preparing glue solution and filtering the glue solution, and applying glue to the front and back of the base paper using a glue applying mechanism;

[0045] Specifically:

[0046] Preparation of glue:

[0047] 001) BVG continuous preparation: corn starch is spirally conveyed and dissolved in water to a makedown solid content of 26%. 250ppm of Buckman amylase / ton of starch and 25kg / ton of protein pretreatment agent are added. The starch emulsion is conveyed, mixed with steam through a BVG blow jet, and then enters a digster at 88°C for 30 minutes. After being cooked in a BVG Super-ECC, the finished glue has a solid content of 22% and a viscosity of 80cfs.

[0048] 002) Preparation of surface salt:

[0049] Add 4000kg of 80℃ hot water and 1000kg of anhydrous sodium sulfate into the surface salt preparation tank, stir at 30rpm for 40 minutes, and discharge into the surface salt storage tank. The concentration is 20% and the density is 1.15.

[0050] 003) Glue mixing: 35kg of dry base glue / ton of paper, 2kg of dry surface glue salt, 6kg of surface sizing agent / ton of paper, 8kg of hexasulfonic acid OBA / ton of paper, 50% of 80℃ dilution water, the glue flow rate passes through the pipeline multi-plate static mixer and enters the work tank of the sizing machine, with a solid content of 12% and a viscosity of 13cfs;

[0051] 004) Glue filtration: starch emulsion is filtered through a 100-mesh filter, glue is filtered through a 120-mesh filter, mixed glue is filtered through a 100-mesh filter, the glue machine feed is passed through a 120-mesh, 560mm diameter slotted screen self-cleaning scraper pressure screen (10s / h), glue machine return is screened through a 100-mesh square vibrating screen, good material is returned to the work tank, and slag is discharged into the ditch.

[0052] Gluing: The upper roller 2 and lower roller 5 of the film transfer sizing machine rotate, dipping them into the glue solution and applying it to the base paper. Gluing is applied to both sides of the base paper. The BU-coated sizing rollers have a linear pressure of 70 kNm, the metering rod is BTG-0325, and the linear pressure is 150 kPa. The sizing temperature is 70°C, and the sizing amount is 1.5 g / m2. The dryness of the single-sided base paper before the film transfer sizing machine is 96%, and the finished paper after the film transfer sizing machine has a dryness of 75%.

[0053] Step 3: Dry the base paper after sizing, and then calender it through a super calender to improve the surface smoothness and strength of the paper.

[0054] Specifically:

[0055] drying:

[0056] The first two groups of single-row drying cylinders, the last two groups of double-row drying cylinders, double-circulation steam, the main steam pressure of the rear drying cylinder is 0.6 bar.

[0057] Calendering:

[0058] Double hot roller soft calendering, upper roller steel rod, lower roller rubberized soft roller, line pressure 90kN.M, temperature 120℃; the profile of the scanning frame can be controlled and the pressure distribution can be adjusted at a single point to ensure stable paper thickness and smoothness. Example 2

[0059] Based on Example 1, see Figures 1-8 shown.

[0060] The glue applying mechanism includes a frame 1;

[0061] The frame 1 is provided with an upper roller 2 for applying glue to the front side of the base paper, the frame 1 is fixedly connected to a silo 3, the silo 3 is provided with a feeding assembly 4, the silo 3 is provided with an adjustable lower roller 5, the upper roller 2 and the lower roller 5 are both rotatable, and a gap is provided between the lower roller 5 and the silo 3. The setting of the gap is conducive to the feeding assembly 4 to push the glue in the silo 3, avoiding the formation of a closed space in the silo 3, which makes the feeding assembly 4 unable to be pushed. Turn on motor 1 8 and motor 2 14 to drive the upper roller 2 and the lower roller 5 to rotate. At the same time, the traction equipment is used to drive the paper to move. When the upper roller 2 rotates, the glue inside the hopper 2 6 will flow to the surface of the upper roller 2. As the upper roller 2 rotates, the glue will be applied to the paper. When the lower roller 5 rotates, the electric push rod 1 41 will drive the piston 42 to rise to ensure that the liquid level of the glue inside the hopper 3 contacts the lower roller 5. When the lower roller 5 rotates, the glue will be applied to the paper, so that both sides of the paper can be glued, thereby improving the surface bonding strength of the paper.

[0062] The frame 1 is fixedly connected to a silo 2 6, the upper roller 2 is attached to the discharge port of the silo 2 6, the bottom of the silo 1 3 is fixedly connected to a fixing frame 7, the frame 1 is fixedly connected to a motor 1 8, and the motor 1 8 is fixedly connected to the upper roller 2.

[0063] The feeding assembly 4 includes an electric push rod 41 fixedly connected to the fixed frame 7. The electric push rod 41 is electrically connected to an external power supply and is controlled by an external control program. The output end of the electric push rod 41 is fixedly connected to a piston 42. The piston 42 is slidably connected to the silo 3, and the top of the piston 42 is set to be concave.

[0064] A groove 18 is provided on one side of the top of the silo 3. The groove 18 consists of a trough body 1 and a trough body 2. The bottom of the trough cavity of the trough body 1 is set to be an inclined surface. A card slot 19 connected to the groove 18 is provided on the silo 3. A positionable baffle 20 is provided in the groove 18, and the baffle 20 is slidably connected to the groove 18.

[0065] The baffle 1 20 is fixedly connected to a limit plate 1 23 , and the limit plate 1 23 is slidably connected to the slot 19 . The baffle 1 20 is fixedly connected to an iron plate 1 21 and an iron plate 2 22 . The top of the silo 1 3 is fixedly connected to a magnetic plate 1 24 .

[0066] A second groove 25 is provided on the top of the silo 2 6, and a second card slot 26 connected to the second groove 25 is provided on the silo 1 3. A second positionable baffle 27 is provided in the second groove 25, and the second baffle 27 is slidably connected to the second groove 25. A second limiting plate 28 is fixedly connected to the second baffle 27, and the second limiting plate 28 is slidably connected to the card slot 26. A second magnetic plate 29 is fixedly connected to the second baffle 27. An iron plate 30 and an iron plate 4 31 are fixedly connected to the top of the silo 2 6. Before gluing the paper, the magnetic plate 2 29 is moved to separate the magnetic plate 2 29 from the iron plate 4 31, and then the baffle 2 27 is driven to move and the magnetic plate 2 29 is made to fit together with the iron plate 4 31. At this time, glue can be added to the silo 2 6; the iron plate 1 21 is moved to separate the iron plate 2 22 from the magnetic plate 1 24, and then the baffle 1 20 is driven to move and the iron plate 1 21 is made to fit together with the magnetic plate 1 24. Then, glue can be added to the silo 3. Example 3

[0067] Based on Example 1, see Figure 1-Figure 3 shown.

[0068] The silo 13 is provided with a fixed seat 9 that can move up and down, and one side of the silo 13 is fixedly connected to an electric push rod 2 10, which is electrically connected to an external power supply and controlled by an external control program. The electric push rod 2 10 is fixedly connected to a connecting plate 11 for driving the fixed seat 9 to move, and the front and back sides of the silo 13 are fixedly connected to a bottom plate 12, and the top of the bottom plate 12 is rotatably connected to a screw rod 13, which is threadedly connected to the fixed seat 9, and the fixed seat 9 is rotatably connected to the lower roller 5. The fixed seat 9 is provided with a motor 2 14 for driving the lower roller 5 to rotate, and a rack 15 is fixedly connected to the connecting plate 11, and the outer surface of the screw rod 13 is fixedly connected to a gear 16 that meshes with the rack 15. By turning on the electric push rod 2 10, the connecting plate 11 is driven to move, thereby driving the rack 15. Then, the meshing transmission between the rack 15 and the gear 16 is utilized to drive the screw 13 to rotate, thereby driving the fixed seat 9 to descend. Then, the paper is placed on the lower roller 5. After that, the lower roller 5 is lifted up and the paper is made to fit the lower roller 5 and the upper roller 2.

[0069] Two support rods 17 are fixedly connected to one side of the silo 1 3 , and both support rods 17 are slidably connected to the connecting plate 11 . Example 4

[0070] In conjunction with Example 1, Example 2 and Example 3, see Figure 9 shown.

[0071] An electrostatic base paper comprises a base paper body 32 , with glue layers 33 bonded to both sides of the base paper body 32 .

[0072] The working principle of the present invention is as follows: by turning on the electric push rod 2 10, the connecting plate 11 is driven to move, thereby driving the rack 15, and then the meshing transmission between the rack 15 and the gear 16 is utilized to drive the screw 13 to rotate, thereby driving the fixed seat 9 to descend, and then the paper is placed on the lower roller 5, and then the lower roller 5 is lifted up, and the paper is made to fit the lower roller 5 and the upper roller 2. Afterwards, motor 1 8 and motor 2 14 are turned on to drive the upper roller 2 and the lower roller 5 to rotate. At the same time, the traction equipment is used to drive the paper to move. When the upper roller 2 rotates, the glue inside the hopper 2 6 will flow to the surface of the upper roller 2. As the upper roller 2 rotates, the glue will be applied to the paper. When the lower roller 5 rotates, the electric push rod 1 41 will drive the piston 42 to rise to ensure that the liquid level of the glue inside the hopper 3 contacts the lower roller 5. When the lower roller 5 rotates, the glue will be applied to the paper, so that both sides of the paper can be glued, thereby improving the surface bonding strength performance of the paper. Before gluing the paper, the magnetic plate 2 29 is moved to separate the magnetic plate 2 29 from the iron plate 4 31, and then the baffle 2 27 is driven to move and the magnetic plate 2 29 is made to fit together with the iron plate 4 31. At this time, glue can be added to the silo 2 6; the iron plate 1 21 is moved to separate the iron plate 2 22 from the magnetic plate 1 24, and then the baffle 1 20 is driven to move and the iron plate 1 21 is made to fit together with the magnetic plate 1 24. Then, glue can be added to the silo 3.

[0073] The above embodiments are only used to illustrate the technical method of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical method of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical method of the present invention.

Claims

1. A method for manufacturing electrostatic base paper, characterized in that: The following steps are involved: Step 1: crushing the raw materials with a pulper, beating the pulp with a conical refiner to obtain a pulped slurry, and then proportioning the slurry to prepare a double-collage base paper; Step 2: preparing glue solution and filtering the glue solution, and applying glue to the front and back of the base paper using a glue applying mechanism; Step 3: Dry the base paper after sizing, and then calender it in a super calender to improve the surface smoothness and strength of the paper; The glue applying mechanism comprises a frame (1); The frame (1) is provided with an upper roller (2) for applying glue to the front side of the base paper, the frame (1) is fixedly connected with a hopper (3), the hopper (3) is provided with a feeding assembly (4), the hopper (3) is provided with an adjustable lower roller (5), and the upper roller (2) and the lower roller (5) are both rotatable; The frame (1) is fixedly connected to a second silo (6), the upper roller (2) is attached to the discharge port of the second silo (6), and the bottom of the first silo (3) is fixedly connected to a fixing frame (7); The feeding assembly (4) includes an electric push rod (41) fixedly connected to a fixed frame (7), an output end of the electric push rod (41) is fixedly connected to a piston (42), the piston (42) is slidably connected to the silo (3), and the top of the piston (42) is arranged to be concave; The first silo (3) is provided with a fixed seat (9) that can move up and down, and one side of the first silo (3) is fixedly connected to the second electric push rod (10), and the second electric push rod (10) is fixedly connected to a connecting plate (11) for driving the fixed seat (9) to move; The front and back sides of the silo (3) are fixedly connected to a bottom plate (12), the top of the bottom plate (12) is rotatably connected to a screw rod (13), the screw rod (13) is threadedly connected to the fixed seat (9), the fixed seat (9) is rotatably connected to the lower roller (5), the fixed seat (9) is provided with a motor (14) for driving the lower roller (5) to rotate, the connecting plate (11) is fixedly connected to a rack (15), and the outer surface of the screw rod (13) is fixedly connected to a gear (16) meshing with the rack (15).

2. The method for manufacturing an electrostatic base paper according to claim 1, characterized in that: Two support rods (17) are fixedly connected to one side of the silo (3), and the two support rods (17) are slidably connected to the connecting plate (11).

3. The method for manufacturing an electrostatic base paper according to claim 2, characterized in that: A groove 1 (18) is provided on one side of the top of the silo 1 (3), and the groove 1 (18) is composed of a trough body 1 and a trough body 2. The bottom of the trough cavity of the trough body 1 is provided with an inclined surface. A clamping groove 1 (19) is provided on the silo 1 (3) and is connected to the groove 1 (18). A positionable baffle 1 (20) is provided in the groove 1 (18), and the baffle 1 (20) is slidably connected to the groove 1 (18).

4. The method for manufacturing an electrostatic base paper according to claim 3, characterized in that: The baffle plate 1 (20) is fixedly connected to a limiting plate 1 (23), and the limiting plate 1 (23) is slidably connected to the slot 1 (19).

5. The method for manufacturing electrostatic base paper according to claim 4, characterized in that: A second groove (25) is provided on the top of the second hopper (6), and a second clamping groove (26) connected to the second groove (25) is provided on the first hopper (3). A second positionable baffle (27) is provided in the second groove (25), and the second baffle (27) is slidably connected to the second groove (25). A second limiting plate (28) is fixedly connected to the second baffle (27), and the second limiting plate (28) is slidably connected to the second clamping groove (26).

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