Low-quantitative-number printing paper production line and process thereof

Abstract

The invention provides a low-quantitative-quantity printing paper production line and a process thereof, and relates to the technical field of printing paper production, the low-quantitative-quantity printing paper production line comprises a sizing module, drying modules, a production mixing tank body, a middle rotating shaft, an inner vertical bar and an upper lifting frame, the drying modules are arranged in front of and behind the sizing module, and the sizing module is communicated with the production mixing tank body through a pipeline; a middle rotating shaft is rotationally arranged in the center of the production mixing tank body, inner vertical strips are arranged in the production mixing tank body in an annular array mode, an upper lifting frame penetrates through the top of the production mixing tank body in a sliding mode and is provided with a sealing rubber ring, and a bottom heating ring is fixedly arranged at the bottom of the inner side of the production mixing tank body. The production mixing tank body can meet the production requirements of high-cationic-degree polymers and can also meet the coating production mixing requirements, two times are combined into one time for production, the production efficiency is improved, and the problems that one time of mixing preparation is added into two times of mixing preparation equipment, and the working procedures of mixing preparation are increased are solved.

Description

Technical Field

[0001] The invention relates to the technical field of digital printing paper production equipment, and in particular to a low-quantity digital printing paper production line and a process thereof. Background Art

[0002] With the increasing urgency of environmental protection tasks and the continuous strengthening of the concept of sustainable development, the global printing and dyeing industry is also in urgent need of seeking technological innovation. Digital printing transfer printing technology has emerged to replace traditional printing and dyeing, which can solve the environmental problem of large amounts of wastewater generated by printing and dyeing. Digital transfer technology is to print computer-made patterns and texts on paper with an inkjet printer, and then contact the paper surface with the printed pattern with the substrate. Under a certain temperature and pressure, the ink on the paper sublimates into a gaseous state, penetrates into the surface of the substrate, and forms a pattern after condensation. In this process, the paper that acts as an ink carrier and transfer is called thermal sublimation digital transfer printing paper, also known as digital printing paper. With the increasing speed of digital printing, the increasingly fierce market competition, and the increasingly strong pursuit of the beauty and saturation of printed colors, low-quantity digital printing paper has become an inevitable trend. Low-quantity digital printing paper has a low ash content, tightly interwoven fibers, and good ink transfer. And low roughness and absorbency and moderate air permeability have a significant effect on improving ink capacity and transfer rate.

[0003] In the prior art, the production process of low quantitative printing paper is improved by improving the transfer coating and adding high cationic polymers, which can enhance the absorption of ink by the coating surface and prevent the ink from penetrating into the paper fibers, so that the capacity and transfer rate of the transfer ink can be effectively improved. After the high cationic polymer is prepared, it is moved to another mixing device and mixed with sodium carboxymethyl cellulose (CMC) for preparation, but the mixing preparation is increased from one mixing preparation to two mixing preparation devices, which increases the mixing preparation process. Summary of the invention

[0004] The disclosed embodiment relates to a low-quantity printing paper production line and a process thereof, wherein a bottom heating ring heats from the bottom, and a lower electric heating element heats from the middle. The bottom heating ring and the lower electric heating element cooperate to heat the liquid at the bottom and the middle, thereby expanding the heating range, accelerating the heating speed, and improving the stability of temperature control; the rotating outer helical teeth guide the liquid in the center to rise upward, and the liquid on the outer side of the rotating stirring blades flows downward; the outer helical teeth and the stirring blades cooperate to guide the formation of an up-and-down flowing annular flow, which promotes uniform mixing of the liquid and is beneficial to uniform heating of the liquid, and promotes the uniformity of the temperature of the liquid at each position; after the preparation of the high cationic polymer in the production mixing tank, low-viscosity CMC, silica, and distilled water are added, and the two times are combined into one production, which is beneficial to improving production efficiency, can meet the production requirements of high cationic polymers, and can meet the mixing requirements of coating production.

[0005] In a first aspect of the present disclosure, a low-quantity printing paper production line is provided, which specifically includes: a gluing module, a drying module, a production mixing tank body, a transfer shaft, inner vertical bars and an upper lifting frame. The gluing module is provided with drying modules at the front and rear of the gluing module. The gluing module pipeline is connected to the lower liquid outlet at the bottom outlet of the production mixing tank body. The central rotation of the production mixing tank body is provided with a transfer shaft. The internal annular array of the production mixing tank body is provided with inner vertical bars. The top of the production mixing tank body is penetrated by an upper lifting frame and is provided with a sealing rubber ring. A bottom heating ring is fixedly provided at the inner bottom of the production mixing tank body. A central liquid guide pipe is fixed at the center of the bottom of the production mixing tank body. A liquid inlet channel is provided in the lower annular array of the central liquid guide pipe. The bottom of the production mixing tank body is connected and fixed with a lower liquid outlet, and the lower liquid outlet is connected with the gluing module pipeline. The upper part of the production mixing tank body is connected and fixed with an upper liquid inlet. A plurality of upper liquid inlets can be provided for respectively feeding different liquids.

[0006] In at least some embodiments, a lower electric heating element is fixed to the lower end of the central rotating shaft, and the lower electric heating element is connected to an external circuit for power supply via a slip ring. External helical teeth are fixedly arranged around the outside of the lower electric heating element. An upper frame is axially slidably arranged on the upper part of the central rotating shaft, and a rotating external gear shaft is arranged around the upper frame. An upper drive motor is fixed to the lower end of the external gear shaft, and the upper drive motor is fixed to the outside of the production mixing tank.

[0007] In at least some embodiments, the lower electric heater and the external spiral teeth are both located on the inner side of the middle liquid guiding tube, the rotating external spiral teeth guide the liquid inside the middle liquid guiding tube to rise upward, guide the liquid into the middle liquid guiding tube to rise upward, the middle liquid guiding tube is located above the lower liquid outlet, the upper frame, the external gear shaft, and the stirring blades are all located inside the production mixing tank body, the liquid on the outside of the rotating stirring blades flows downward, and the stirring blades guide the liquid pushed up by the upper external spiral teeth to flow downward again.

[0008] In at least some embodiments, a lower scraper is fixed to the bottom of the inner vertical bar, an upper connecting slide is slidably arranged at intervals on the upper part of the inner vertical bar, the upper connecting slide is rotatably connected to the head end of the inner connecting support rod, and the tail end of the inner connecting support rod on the lower side of the inner vertical bar is rotatably connected to the lower connecting swivel shaft.

[0009] In at least some embodiments, the bottom rubber strip of the inner vertical bar and the bottom rubber strip of the lower scraper are flush with each other, the bottom rubber strips of the inner vertical bar and the lower scraper fit and slide with the top of the bottom heating ring, the top of the inner vertical bar fits and slides horizontally with the bottom of the upper frame, and the inner vertical bar and the lower scraper fit with the bottom heating ring.

[0010] In at least some embodiments, the upper end of the upper lifting frame is fixedly connected to the telescopic rod of the upper lifting telescopic cylinder, the upper lifting telescopic cylinder can be electrically driven or hydraulically driven, the lower end of the upper lifting frame is fixedly connected to the lower connecting frame, and the lower part of the lower connecting frame is fixedly connected to the lower gear ring.

[0011] In at least some embodiments, the lower connecting ring rotates in a circular direction in the middle of the middle liquid guiding tube, the inner vertical bar annular array is arranged on the outer side of the middle liquid guiding tube, the tail end of the inner connecting support rod on the upper side of the inner vertical bar is rotatably connected with the upper frame body rotation axis, the lower connecting frame drives the upper frame body to move upward synchronously, the upper frame body drives the inner connecting support rod to tilt in a vertical direction, and the two eight-shaped inner connecting support rods synchronously support the inner vertical bar to move inward from the center.

[0012] In at least some embodiments, the upper lifting and telescopic cylinder is fixed on the top of the outer side of the production mixing tank body, the lower gear ring is meshed with the upper end gear of the outer gear shaft, the outer gear shaft meshes with the lower gear ring to rotate, the outer gear shaft and the stirring blades rotate synchronously, the liquid on the outside of the rotating stirring blades flows downward, and the stirring blades guide the liquid pushed up by the upper outer spiral teeth to flow downward again.

[0013] In at least some embodiments, the lower connecting frame and the upper frame are connected in a circular rotation. When the upper frame moves vertically downward, the inner vertical bars move closer to the inner wall of the production mixing tank body, and the inner vertical bars slide against the inner wall of the production mixing tank body. The inner vertical bars scrape off the liquid inside the production mixing tank body, and the lower scraper scrapes off the liquid on the top of the bottom heating ring, thereby accelerating the downward flow of the liquid inside the production mixing tank body.

[0014] The present invention discloses a manufacturing process of a low-quantity printing paper production line, comprising the following steps:

[0015] The pulp uses bleached coniferous wood pulp and bleached broadleaf wood pulp as the main fiber raw materials. After the pulp is formed into paper sheets, it passes through a press roller to remove excess water and enters the drying module for drying. After drying in the drying module, the dried paper sheets enter the sizing module for transfer coating and paper sheet combination;

[0016] Preparation of high cationic polymer and transfer coating inside the production mixing tank;

[0017] In the production mixing tank, the redox reaction of monomer A, monomer B and distilled water is first carried out to form a high cationic polymer. The homopolymer of monomer A has good film-forming properties, and the homopolymer of monomer B has a high cationic degree. The ratio of monomer A to monomer B is 7:3.

[0018] The mixing tank is produced and then sodium carboxymethyl cellulose (CMC), silicon dioxide and distilled water are added for mixing. The addition amount of high cationic polymer is 10%, the addition amount of silicon dioxide is 2%-3%, and the addition amount of sodium carboxymethyl cellulose (CMC) is 20%.

[0019] After the transfer coating and paper sheet are combined in the sizing module, they enter the drying module for drying.

[0020] The present invention provides a low-quantity printing paper production line and process thereof, which has the following beneficial effects:

[0021] The bottom heating ring heats from the bottom, and the lower electric heating element heats from the middle. The bottom heating ring and the lower electric heating element cooperate to heat the liquid at the bottom and the middle, thereby expanding the heating range, accelerating the heating speed, and improving the stability of temperature control.

[0022] The rotating outer spiral teeth guide the liquid in the center to rise, and the liquid on the outside of the rotating stirring blades flows downward. The cooperation between the outer spiral teeth and the stirring blades forms an up-and-down flowing annular flow, which promotes uniform mixing of the liquid and is beneficial to uniform heating of the liquid, thus promoting uniform temperature of the liquid at each position.

[0023] After the high cationic polymer is prepared in the production mixing tank, low viscosity CMC, silica and distilled water are added. The two productions are combined into one, which is beneficial to improve production efficiency, and can meet the production requirements of high cationic polymers and the mixing needs of coating production.

[0024] The inner vertical bars and the lower scraper fit the bottom heating ring to prevent the liquid on the top of the bottom heating ring from being in contact with excessively high temperatures for a long time. During the discharging process, the inner vertical bars expand outward and fit the production mixing tank body to scrape off the liquid inside the production mixing tank body. The lower scraper scrapes off the liquid on the top of the bottom heating ring to reduce the residual liquid inside the production mixing tank body and on the top of the bottom heating ring, thereby reducing the cleaning burden of the production mixing tank body. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings of the embodiment are briefly introduced below.

[0026] The drawings described below are only related to some embodiments of the present invention, but are not intended to limit the present invention.

[0027] In the attached picture:

[0028] Figure 1 A schematic diagram showing the overall structure of the present application;

[0029] Figure 2 The preparation flow chart of the high cationic polymer of the present application is shown;

[0030] Figure 3 A schematic diagram of a half-section structure of a production mixing tank of the present application is shown;

[0031] Figure 4 The schematic diagram of the structure of the transfer shaft of the present application is shown;

[0032] Figure 5The schematic diagram of the structure of the inner vertical bar of the present application is shown;

[0033] Figure 6 A schematic diagram of the structure of the external helical gear of the present application is shown;

[0034] Figure 7 A schematic structural diagram of the lower gear ring of the present application is shown;

[0035] Figure 8 A schematic diagram showing the separation state of the production mixing tank, the central transfer shaft, the inner vertical bars, and the upper lifting frame of the present application;

[0036] Reference numerals list

[0037] 1. Glue application module;

[0038] 2. Drying module;

[0039] 3. Production mixing tank; 301, bottom heating ring; 302, middle liquid guide tube; 303, liquid inlet channel; 304, lower liquid outlet; 305, upper liquid inlet;

[0040] 4. middle rotating shaft; 401. lower electric heating element; 402. external helical gear; 403. upper frame; 404. external gear rotating shaft; 405. stirring blade; 406. upper driving motor;

[0041] 5. Inner vertical bar; 501. Lower scraper; 502. Upper connecting carriage; 503. Inner connecting support rod; 504. Lower connecting swivel;

[0042] 6. Upper lifting frame; 601. Upper lifting telescopic cylinder; 602. Lower connecting frame; 603. Lower gear ring. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment 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.

[0044] Example 1: Please refer to Figures 1 to 8 :

[0045] The present invention proposes a low-quantity printing paper production line, comprising: a gluing module 1, a drying module 2, a production mixing tank body 3, a central transfer shaft 4, an inner vertical bar 5 and an upper lifting frame 6, the gluing module 1 is provided with a drying module 2 at the front and rear, the gluing module 1 is connected to the bottom outlet of the production mixing tank body 3 by a pipeline, a bottom heating ring 301 is fixedly arranged at the inner bottom of the production mixing tank body 3, a central liquid guide tube 302 is fixed at the bottom center of the production mixing tank body 3, a liquid inlet channel 303 is provided in the lower annular array of the central liquid guide tube 302, a lower liquid outlet 304 is fixedly arranged at the bottom of the production mixing tank body 3, the lower liquid outlet 304 is connected to the gluing module 1 pipeline, and the production mixing tank An upper liquid inlet 305 is fixedly connected to the upper part of the body 3, and a plurality of upper liquid inlets 305 can be provided for respectively feeding different liquids. A central rotating shaft 4 is provided for rotation at the center of the production mixing tank body 3, and a lower electric heating element 401 is fixed at the lower end of the central rotating shaft 4. The lower electric heating element 401 is connected to an external circuit for power supply through a slip ring, and an external helical tooth 402 is fixedly provided around the outer periphery of the lower electric heating element 401. An upper frame body 403 is axially slidably provided on the upper part of the central rotating shaft 4, and a rotating external gear shaft 404 is provided around the upper frame body 403. An upper drive motor 406 is fixed at the lower end of the external gear shaft 404, and the upper drive motor 406 is fixed on the outer side of the production mixing tank body 3;

[0046] The inner annular array of the production mixing tank body 3 is provided with inner vertical bars 5, the bottom of the inner vertical bars 5 is fixed with a lower scraper 501, the upper part of the inner vertical bars 5 is slidably provided with an upper connecting slide 502, the upper connecting slide 502 is rotatably connected to the head end of the inner connecting support rod 503, the tail end of the inner connecting support rod 503 of the lower side of the inner vertical bar 5 is rotatably connected with the lower connecting swivel 504 rotating shaft, the top of the production mixing tank body 3 is penetrated and slidably provided with an upper lifting frame 6 and a sealing rubber ring, the lower connecting swivel 504 rotates circumferentially in the middle of the middle liquid guiding tube 302, the inner vertical bars 5 are arranged in an annular array on the outside of the middle liquid guiding tube 302, and the inner vertical bars 5 are arranged in an annular array. The tail end of the inner connecting support rod 503 of the upper inner connecting support rod 503 cooperates with the rotating shaft of the upper frame body 403 for rotation connection, the lower connecting frame 602 drives the upper frame body 403 to move upward synchronously, and the upper frame body 403 drives the inner connecting support rod 503 to tilt toward the vertical direction, and the two eight-shaped inner connecting support rods 503 synchronously support the inner vertical bar 5 to move toward the inner side of the center, the upper end of the upper lifting frame 6 is fixedly connected to the telescopic rod of the upper lifting telescopic cylinder 601, and the upper lifting telescopic cylinder 601 can be electrically driven or hydraulically driven, the lower end of the upper lifting frame 6 is fixedly connected to the lower connecting frame 602, and the lower part of the lower connecting frame 602 is fixedly connected with the lower gear ring 603.

[0047] In the disclosed embodiment, the lower electric heating element 401 and the outer spiral teeth 402 are both located on the inner side of the middle liquid guiding tube 302, and the rotating outer spiral teeth 402 guide the liquid inside the middle liquid guiding tube 302 to rise upward, and guide the liquid to enter the middle liquid guiding tube 302 and rise upward, and the middle liquid guiding tube 302 is located above the lower liquid outlet 304, and the upper frame 403, the outer gear shaft 404, and the stirring blades 405 are all located inside the production mixing tank body 3, and the liquid on the outside of the rotating stirring blades 405 flows downward, and the stirring blades 405 guide the liquid pushed up by the upper outer spiral teeth 402 to flow downward again, and the cooperation of the outer spiral teeth 402 and the stirring blades 405 guides the formation of an upward and downward flowing circular circulation, thereby promoting uniform mixing of the liquid.

[0048] In the disclosed embodiment, the bottom rubber strip of the inner vertical bar 5 and the bottom rubber strip of the lower scraper 501 are flush with each other, the bottom rubber strips of the inner vertical bar 5 and the lower scraper 501 slide in close contact with the top of the bottom heating ring 301, the top of the inner vertical bar 5 and the bottom of the upper frame 403 slide in close contact with each other horizontally, the inner vertical bar 5 and the lower scraper 501 slide in close contact with the bottom heating ring 301 to prevent the liquid on the top of the bottom heating ring 301 from being in contact with the temperature too high for a long time, and the lower scraper 501 scrapes off the liquid on the top of the bottom heating ring 301.

[0049] In the disclosed embodiment, the upper lifting telescopic cylinder 601 is fixed on the outer top of the production mixing tank body 3, the lower gear ring 603 is meshed with the upper end gear of the outer gear shaft 404, the outer gear shaft 404 meshes with the lower gear ring 603 to rotate, the outer gear shaft 404 and the stirring blade 405 rotate synchronously, the liquid on the outside of the rotating stirring blade 405 flows downward, the stirring blade 405 guides the liquid pushed up by the upper outer spiral teeth 402 to flow downward again, the cooperation of the outer spiral teeth 402 and the stirring blade 405 guides the formation of an up and down flowing circular circulation, thereby promoting uniform mixing of the liquid.

[0050] In the disclosed embodiment, the lower connecting frame 602 and the upper frame body 403 are connected in a circular rotation. When the upper frame body 403 moves vertically downward, the inner vertical bar 5 moves closer to the inner wall of the production mixing tank body 3, and the inner vertical bar 5 slides against the inner wall of the production mixing tank body 3. The inner vertical bar 5 scrapes the liquid inside the production mixing tank body 3, and the lower scraper 501 scrapes the liquid on the top of the bottom heating ring 301, thereby accelerating the downward flow of the liquid inside the production mixing tank body 3, reducing the liquid residue inside the production mixing tank body 3 and on the top of the bottom heating ring 301, and reducing the cleaning burden of the production mixing tank body 3.

[0051] The present invention discloses a manufacturing process of a low-quantity printing paper production line, comprising the following steps:

[0052] The pulp selects bleached coniferous wood pulp and bleached broadleaved wood pulp as the main fiber raw materials. After the pulp is formed into a paper sheet, it passes through a pressing roller to remove excess water and enters the drying module 2 for drying. After drying in the drying module 2, the dried paper sheet enters the sizing module 1 for transfer coating and paper sheet combination, and detects the sizing amount, film forming property, water absorption and other indicators of the sizing agent under different states; according to the requirements of the sizing barrier performance, select the appropriate coating method such as brush type, scraper type, air knife type, scraper type, roller type, etc. to ensure that the paper has good uniformity, barrier and water permeability and other characteristics;

[0053] The high cationic polymer and transfer coating are prepared inside the production mixing tank 3. The high cationic polymer has a low monomer residual rate, a high cationic charge density, good fluidity and storage stability; the ultra-low viscosity, high substitution degree modified CMC has a viscosity of only 500mPas at a concentration of 20%, and the coating has good fluidity and coverage, and the transfer effect is also relatively ideal. The low viscosity replaces the high viscosity CMC to not only increase the solid content of the coating, but also effectively prevent ink penetration;

[0054] In the production mixing tank 3, the monomer A and monomer B are first subjected to redox reaction with distilled water to form a high cationic polymer. The monomer A homopolymer has good film-forming properties, and the monomer B homopolymer has a high cationic degree. The ratio of monomer A to monomer B is 7:3. Since the coating is negatively charged, during printing, the anionic thermal sublimation transfer ink is blocked by the sodium carboxymethyl cellulose film and mainly stays on the coating, which is also the basis for the subsequent good digital transfer effect. However, since the ink and the coating have the same charge polarity, the rate at which the ink penetrates into the coating is relatively slow. In other words, after printing, the drying of the ink is mainly carried out in two ways: the volatilization of the ink solvent and the penetration into the paper coating. Under the premise of a certain volatilization rate, the speed at which the ink solvent penetrates into the coating directly determines the drying rate of the printing. Obviously, the electrostatic repulsion of the anionic sodium carboxymethyl cellulose as a coating is not conducive to the drying of the ink. This project appropriately adjusts the surface charge of the coating by adding a homemade high-cationic copolymer, and utilizes the high adsorption of high specific surface area and large pore volume pigments to improve the capacity and drying speed of the digital transfer ink.

[0055] Production mixing tank 3 then adds sodium carboxymethyl cellulose CMC, silicon dioxide, and distilled water for mixing. The reason why the high cationic copolymer can improve the drying rate of the ink is mainly due to the adsorption of the opposite charges of the ink. However, as the addition ratio increases, the transfer effect will be significantly worse, which may be due to the fact that the high cationic copolymer tends to diffuse into the interior of the paper fiber. Considering all factors, the addition amount of the high cationic polymer is 10%;

[0056] The addition of porous silica aerogel can significantly increase the drying rate of the ink, and as its addition amount increases relative to sodium carboxymethyl cellulose powder, the drying rate of the ink gradually increases. This is because the surface hydroxyl groups of silica and its own large pore volume have higher adsorption and accommodation capacity for thermal sublimation ink than polymer materials. However, as the addition amount of silica continues to increase to more than 3%, ink bleeding gradually occurs during transfer. The macroscopic manifestation is the appearance of randomly distributed small ink spots on the coating surface of the thermal transfer paper after transfer. This may be due to the fact that the binding force of silica on the ink is greater than the escape force of the ink under thermal sublimation during transfer. Therefore, considering the comprehensive factors such as ink drying time, transfer effect and production cost, the addition amount of silica is 2%-3%;

[0057] The viscosity of high molecular weight and high degree of substitution CMC is already very high at low concentrations. It is not feasible to reduce the overall moisture content in the coating by increasing the solid content. The coating with 20% sodium carboxymethyl cellulose CMC has good fluidity and coverage, and the transfer effect is also ideal.

[0058] After the transfer coating and paper sheet are combined in the sizing module 1, they enter the drying module 2 for drying. Since the digital transfer paper is coated with a thermal sublimation transfer coating on the front of the base paper, mainly a coating based on CMC adhesive, the paper is prone to warping toward the front during production and use. Therefore, it is necessary to perform correction coating on the back of the paper to balance the stress of the paper.

[0059] In the second embodiment, on the basis of the first embodiment, ethanol is used to partially replace distilled water as the solvent. On the one hand, the density of ethanol is slightly smaller than that of distilled water, and ethanol can reduce the viscosity of the system at the same coating concentration; on the other hand, because ethanol has a certain volatility, it can combine with a certain amount of water molecules to break away from the constraints of the glue during the drying and volatilization process, thereby increasing the drying rate of the paper.

[0060] Working principle of the first embodiment: The project team has conducted a lot of research on the low gram weight of digital transfer paper, ink capacity, transfer effect, drying rate, etc. The research results show that the use of low viscosity to replace high viscosity sodium carboxymethyl cellulose CMC can increase the solid content of the coating and improve the drying rate. The addition of volatile amphoteric solvents can increase the drying rate of the transfer paper coating. The addition of self-made high cationic polymers and macroporous inorganic fillers can significantly shorten the capacity of thermal sublimation ink after printing and obtain good transfer effect.

[0061] Low-weight heavy-ink digital printing paper requires that the paper can quickly absorb aqueous solvents. In order to improve the paper's ability to accommodate and quickly absorb aqueous solvents, the paper is required to have a loose and porous structure and to have high strength. This project adds self-designed water channel composite materials, and adds sizing agents, wet strength agents, dry strength agents, etc., to study the effects of various chemical dosages, usage processes, etc. on the quality properties of base paper such as porosity, smoothness, and absorbency, as well as ink capacity, drying rate, and transfer effects. The water molecule channel is modified and constructed by composite inorganic fillers. The water molecule channel is a three-dimensional network channel structure obtained by coupling inorganic fillers and microcrystalline cellulose-chitosan through a coupling agent. The inorganic filler is a combination of two fillers with different structural shapes, including lamellar calcined kaolin and polyhedral fumed silica. Try to design and construct enough cavities, and effectively connect microcrystalline cellulose with different cavities to ensure the accommodation space and penetration function of aqueous solvent molecules. Composite materials formed by carboxymethyl chitosan or cationic starch with kaolin and fumed silica particles can be effectively and tightly adsorbed on the surface of pulp fibers, and entangled with pulp fibers, which can retain the structural gaps of cellulose molecules. Therefore, it is necessary to systematically study the relationship between the structure and performance of water molecule channel composite materials formed by different combinations of kaolin and fumed silica particles, and the types and combinations of chitosan or cationic starch, so as to have a deeper understanding of the relationship between structural morphological changes and the accommodation space and penetration function of aqueous solvents. The inorganic filler is two or more of kaolin and silica. Kaolin is mainly lamellar, and silica is polyhedral. The combination of the two is coupled with chitosan, cationic starch, and microcrystalline cellulose to form a composite material; the water molecule channel is a three-dimensional network channel formed by the composite of layered and spherical inorganic fillers and microcrystalline cellulose-chitosan; the water molecule channel is connected to the pulp fiber through the sizing agent resin of the composite material. The water molecule channel can effectively solve the sealing effect of the sizing agent resin on the paper fiber layer and its gaps, and achieve the purpose of ink accommodation and transfer.

[0062] In the water channel composite material, microcrystalline cellulose-chitosan is connected to the cavities on the two types of inorganic fillers, namely, flaky and polyhedral ones. One end of the microcrystalline cellulose extends into the cavity, and the other end is outside the cavity. Since the connection angles of the microcrystalline cellulose and the cavity are different, when sizing the base paper, the sizing agent cannot fill the cavities of the layered inorganic fillers or the porous channels formed by the microcrystalline cellulose-chitosan, and will not completely close the water molecule channels. Therefore, the structure of the inorganic filler and the combination of the two fillers are designed to construct enough cavities as much as possible, and effectively connect different cavities through microcrystalline cellulose to ensure the accommodation space and penetration function of the aqueous solvent; the water molecule channel composite material is completed by composite modification of flaky and polyhedral inorganic fillers. Of course, other types of combinations can also be explored, or the design and combination can be carried out according to needs. The purpose is to increase the accommodation space of the aqueous solvent and the speed of penetration into the digital printing base paper, so that it can carry more transferred color inks to achieve higher requirements for color vividness and saturation, and enable the aqueous solvent molecules to better pass through the digital transfer base paper, thereby accelerating the drying speed of the digital transfer paper, further improving the application of digital transfer technology, and better realizing the improvement of digital transfer production efficiency.

[0063] Digital printing paper needs to have certain physical strength, good uniformity, small deformation and other characteristics, so it is necessary to effectively control the paper forming and surface sizing process, including flow conveying, dehydration, pressing, drying, surface sizing and other processes. The specific operating parameters of the paper machine that need to be controlled include: web concentration, vacuum degree of dehydration components, pressing line pressure, drying cylinder temperature and heating curve, surface sizing agent type and sizing process, etc.; through the study of process conditions, the optimal digital transfer base paper production technology is formed; because digital transfer paper is coated with thermal sublimation transfer coating on the front of the base paper, mainly with coatings based on CMC adhesives, the paper is prone to warping towards the front during production and use. Therefore, it is necessary to perform correction coating on the back of the paper to balance the stress of the paper;

[0064] Sodium carboxymethyl cellulose (CMC) is one of the main components of digital transfer paper coating. Sodium carboxymethyl cellulose (CMC) has a certain viscosity and swelling property after being dissolved in water, and has a certain film-forming property after coating. Therefore, it can stay on the surface of paper in the form of a coating when coated. In addition, since the swelling rate of sodium carboxymethyl cellulose (CMC) coating is large after being wetted, and this swelling is conducive to the absorption of thermal sublimation ink by the coating surface, and can prevent the ink from penetrating into the paper fiber, it can effectively improve the capacity and transfer rate of transfer ink. However, with the increase of transfer speed, traditional high-viscosity sodium carboxymethyl cellulose (CMC) can no longer meet the requirements of ink drying and coating strength. Research and develop low-viscosity sodium carboxymethyl cellulose (CMC) to replace high-viscosity sodium carboxymethyl cellulose (CMC). Reducing the viscosity of sodium carboxymethyl cellulose (CMC) can increase the solid content of the coating, shorten the drying time of paper, and improve production efficiency. High degree of substitution means high degree of carboxymethylation and high charge density. Since sodium carboxymethyl cellulose CMC has the same electrical properties as paper fibers, the coating can stay on the surface of the paper instead of penetrating into the interior of the paper after coating, which is beneficial to the subsequent digital transfer process. Similarly, the transfer ink is also anionic, and low-viscosity sodium carboxymethyl cellulose (abbreviated as CMC) is used as the main film-forming substance of the coating, which can not only increase the concentration of the coating to improve production efficiency, but also prevent the ink from penetrating into the interior of the paper fiber through greater electrostatic repulsion, so as to improve the transfer rate and meet higher requirements for color vividness and saturation.

[0065] In the production mixing tank 3, the production of high cationic polymer is first carried out, the ratio between monomer A and monomer B is 7:3, the redox reaction of monomer A and monomer B and distilled water, and then the bottom heating ring 301 is heated from the bottom, and the lower electric heating element 401 is heated from the middle to assist in heating to 50 degrees Celsius, add chain transfer agent, and then slowly heat to 70 degrees Celsius, monitor viscosity and keep warm, after reaching the viscosity requirement, the body is heated and the inhibitor is added, and then cooled to room temperature for discharging, the bottom heating ring 301 and the lower electric heating element 401 cooperate to heat the bottom and middle liquid, expand the heating range, speed up the heating speed, and improve the stability of temperature control;

[0066] The production mixing tank 3 can meet the production requirements of high cationic polymers and the mixing requirements of coating production. The production mixing tank 3 can also be discharged without discharging, and then low-viscosity CMC, silicon dioxide and distilled water are added. The two times are combined into one production. Low-viscosity CMC is used to replace high-viscosity CMC as the main film-forming material of the coating, which can increase the use concentration of the coating and help improve production efficiency. The final coating can also prevent ink from penetrating into the paper fiber through a large electrostatic repulsion effect, so as to improve the ink capacity and transfer rate.

[0067] Low viscosity CMC, silicon dioxide and distilled water are mixed in the production mixing tank 3. The upper driving motor 406 drives the middle rotating shaft 4 and the lower electric heating element 401, the outer spiral gear 402, the upper frame 403, the inner vertical bar 5 and the lower scraper 501 to rotate. The rotating outer spiral gear 402 guides the liquid in the middle liquid guide tube 302 to rise upward. The middle liquid guide tube 302 is connected to the bottom of the mixing tank 3 through the liquid inlet channel 303, guiding the liquid to enter the middle liquid guide tube 302 and rise upward. The upper frame 403 and the outer gear shaft 404 rotate synchronously in the circumferential direction. The outer gear shaft 404 engages with the lower gear ring 603 to rotate. The gear shaft 404 and the stirring blade 405 rotate synchronously, and the liquid outside the rotating stirring blade 405 flows downward, and the stirring blade 405 guides the liquid pushed up by the upper outer spiral teeth 402 to flow downward again. The cooperation of the outer spiral teeth 402 and the stirring blade 405 forms an upward and downward flowing circular ring flow, which promotes the uniform mixing of the liquid and meets the mixing requirements of the coating production. At the same time, the upward and downward reciprocating flow of the liquid continuously passes through the bottom heating ring 301 and the lower electric heating element 401, which is conducive to the uniform heating of the liquid, promotes the uniformity of the temperature of the liquid at each position, and meets the production requirements of high cationic polymers;

[0068] The inner vertical bar 5 rotates synchronously in a circular direction to stir the liquid. The inner vertical bar 5 and the lower scraper 501 fit the bottom heating ring 301 to prevent the liquid on the top of the bottom heating ring 301 from being in contact with the temperature being too high for a long time. The upper lifting and telescopic cylinder 601 shortens to support the upper lifting frame 6 and the lower connecting frame 602 and the lower gear ring 603 to move downward. The lower connecting frame 602 drives the upper frame body 403 to move downward synchronously. The upper frame body 403 drives the inner connecting support rod 503 to tilt toward the horizontal direction. The two eight-shaped inner connecting support rods 503 synchronously support the inner vertical bar 5 to The inner vertical bar 5 moves outwards, and during the discharging process, the inner vertical bar 5 expands outwards and slides in contact with the production mixing tank body 3, and the inner vertical bar 5 scrapes the liquid inside the production mixing tank body 3. The lower scraper 501 scrapes the liquid on the top of the bottom heating ring 301, accelerates the downward flow of the liquid inside the production mixing tank body 3, reduces the residual liquid inside the production mixing tank body 3 and the top of the bottom heating ring 301, reduces the cleaning burden of the production mixing tank body 3, and reduces the amount of waste caused by the cleaning of the residual liquid in the production mixing tank body 3, so as to meet the coating production mixing requirements.

[0069] In this article, there are a few points to note:

[0070] 1. The drawings of the embodiments of the present disclosure only involve structures related to the embodiments of the present disclosure, and other structures may refer to general designs.

[0071] 2. In the absence of conflict, the embodiments of the present disclosure and the features therein may be combined with each other to obtain new embodiments.

[0072] The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A low-quantity printing paper production line, comprising: The invention relates to a glue application module (1), a drying module (2), a production mixing tank body (3), a transfer shaft (4), inner vertical bars (5) and an upper lifting frame (6); the glue application module (1) is provided with a drying module (2) at the front and rear, the glue application module (1) is connected to the production mixing tank body (3) through a pipeline, the production mixing tank body (3) is provided with a transfer shaft (4) at the center of the production mixing tank body (3), the inner annular array of the production mixing tank body (3) is provided with inner vertical bars (5), the top of the production mixing tank body (3) is provided with a plurality of inner vertical bars (5), and the upper lifting frame (6) is provided with a plurality of inner vertical bars (5). An upper lifting frame (6) is slidably penetrated and provided with a sealing rubber ring, a bottom heating ring (301) is fixedly provided at the inner bottom of the production mixing tank body (3), a middle liquid guide tube (302) is fixed at the center of the bottom of the production mixing tank body (3), a liquid inlet channel (303) is provided in a lower annular array of the middle liquid guide tube (302), a lower liquid outlet (304) is connected and fixed at the bottom of the production mixing tank body (3), and an upper liquid inlet (305) is connected and fixed at the upper part of the production mixing tank body (3).

2. A low-quantity printing paper production line according to claim 1, characterized in that: A lower electric heating element (401) is fixed at the lower end of the central rotating shaft (4), and an external helical tooth (402) is fixedly arranged around the outside of the lower electric heating element (401). An upper frame (403) is axially slidably arranged on the upper part of the central rotating shaft (4), and a rotating external gear shaft (404) is arranged around the upper frame (403). An upper driving motor (406) is fixed to the lower end of the external gear shaft (404).

3. A low-quantity printing paper production line according to claim 2, characterized in that: The lower electric heating element (401) and the outer spiral teeth (402) are both located on the inner side of the middle liquid guide tube (302), the middle liquid guide tube (302) is located above the lower liquid outlet (304), and the upper frame (403), the outer gear shaft (404), and the stirring blades (405) are all located inside the production mixing tank (3).

4. A low-quantity printing paper production line according to claim 3, characterized in that: A lower scraper (501) is fixed at the bottom of the inner vertical bar (5), and an upper connecting slide (502) is slidably arranged at intervals on the upper part of the inner vertical bar (5). The upper connecting slide (502) is rotatably connected to the head end of the inner connecting support rod (503), and the tail end of the inner connecting support rod (503) on the lower side of the inner vertical bar (5) is rotatably connected to the rotating shaft of the lower connecting swivel (504).

5. A low-quantity printing paper production line according to claim 4, characterized in that: The bottom of the inner vertical bar (5) and the bottom of the lower scraper (501) are flush with each other, the bottom of the inner vertical bar (5) and the lower scraper (501) are fitted and slid with the top of the bottom heating ring (301), and the top of the inner vertical bar (5) and the bottom of the upper frame (403) are fitted and slid horizontally.

6. A low-quantity printing paper production line according to claim 5, characterized in that: The upper end of the upper lifting frame (6) is fixedly connected to the telescopic rod of the upper lifting telescopic cylinder (601), the lower end of the upper lifting frame (6) is fixedly connected to the lower connecting frame (602), and the lower part of the lower connecting frame (602) is fixedly connected with a lower gear ring (603).

7. A low-quantity printing paper production line according to claim 5, characterized in that: The lower connecting ring (504) rotates in a circular direction in the middle of the middle liquid guiding tube (302), the inner vertical bars (5) are arranged in a circular array on the outside of the middle liquid guiding tube (302), and the tail end of the inner connecting support rod (503) on the upper side of the inner vertical bar (5) is rotatably connected with the rotating shaft of the upper frame body (403).

8. The manufacturing process of a low-quantity printing paper production line according to claim 6, characterized in that: The upper lifting and telescopic cylinder (601) is fixed to the top of the outer side of the production mixing tank body (3), and the lower gear ring (603) is meshedly connected with the upper end of the external gear shaft (404).

9. The manufacturing process of a low-quantity printing paper production line according to claim 8, characterized in that: The lower connecting frame (602) and the upper frame body (403) are connected to each other in a circular rotational direction. When the upper frame body (403) moves vertically downward, the inner vertical bar (5) moves closer to one side of the inner wall of the production mixing tank body (3).

10. The manufacturing process of a low-quantity printing paper production line according to claim 1, characterized in that: The following steps are involved: 1) After the pulp is formed into paper sheets, it passes through a pressing roller to remove excess water and enters a drying module (2) for drying. After drying in the drying module (2), the dried paper sheets enter a sizing module (1) for transfer coating and paper sheet bonding; 2) Preparation of high cationic polymer and transfer coating inside the production mixing tank (3); 3) In the production mixing tank (3), the monomer A and the monomer B are first subjected to oxidation-reduction reaction with distilled water to form a high cationic polymer. The monomer A homopolymer has good film-forming properties, and the monomer B homopolymer has a high cationicity. The ratio of monomer A to monomer B is 7:

3. 4) Production of a mixing tank (3) and then adding sodium carboxymethyl cellulose (CMC), silicon dioxide and distilled water for mixing, wherein the amount of the high cationic polymer added is 10%, the amount of silicon dioxide added is 2%-3%, and the amount of sodium carboxymethyl cellulose (CMC) added is 20%; 5) After the transfer coating and paper sheet are combined in the gluing module (1), the transfer coating and paper sheet enter the drying module (2) for drying.

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