Back sizing system for papermaking

Abstract

The invention relates to a back sizing system for papermaking, which comprises a glue supply unit, a sizing unit and a drying unit, the glue supply unit is used for preparing a sizing material for the sizing unit, the sizing unit is used for coating a paper surface with the sizing material, and the drying unit is used for drying the sizing material coated on the paper surface; wherein the sizing unit comprises a sizing rack, a first power source, a second power source, a third power source, a back roller, a back sizing feeding roller, a scraper, a first motor and a second motor, paper penetrates through the space between the back roller and the back sizing feeding roller, the back roller is used for guiding the paper, and the back sizing feeding roller is used for coating sizing materials on the paper; the scraper is used for scraping redundant fiber wool particles on the paper surface. The back sizing system for papermaking is used for optimizing the quality of all kinds of paper for coating grey ground white, improving the first-grade product rate and increasing the profit, the quality of finished products is effectively improved through the equipment, the first-grade product rate can be improved by 2%, the annual output is 650,000 tons, and the annual profit is increased by 39,000,000.

Description

Technical Field

[0001] The present invention relates to the technical field of papermaking, in particular to a back sizing system for papermaking. Background Art

[0002] In the printing and packaging market, common glossy papers include single-sided white cardboard and coated paper. Single-sided white cardboard has a rough gray bottom surface and a smooth, glossy white front surface. After color printing on the front surface, single-sided white cardboard is often used to make various high-end paper boxes and cartons. Coated paper has a smooth, glossy white bottom and front surface and is often used to make exquisite book and magazine covers after color printing.

[0003] During the production of grey-backed white board paper, when the pulp passes through the drying zone, fibers or other impurities in the pulp are separated from the surface of the paper, forming fine paper scraps or fiber particles.

[0004] The causes of paper lint include not only the fiber quality and tissue structure in the pulp, but also the papermaking process, such as: 1. The fiber length distribution in the pulp is uneven, or there are impurities such as short fibers and debris with an average length of less than 0.3 mm. These unstable fibers are easily detached from the paper surface after the high-temperature (between 65-110°C) and high-speed (paper running speed between 700m / min-800m / min) drying process in the drying area, forming paper fibers.

[0005] 2. The surface of the paper is rough and uneven, or there are fibers that are not fully compacted. These weak fibers are also easy to detach under the high temperature and high speed conditions in the drying area, forming paper fibers.

[0006] The generation of the above-mentioned paper hair will cause some harm and impact on the papermaking process and paper quality. First, it will reduce the quality of paper. The paper hair will adhere to the surface of the paper or embed in it, causing the surface of the paper to be uneven and rough, affecting the appearance and texture of the paper, and causing the smoothness of the paper to decrease; secondly, it will affect the printing quality. The paper hair is easy to adhere to ink or printing ink during the printing process, causing stains, black spots or unclear problems on the printed products; thirdly, the paper hair will clog papermaking equipment and pipelines, affecting production efficiency and the normal operation of the equipment. The accumulation and accumulation of paper hair will cause equipment blockage, wear, and even cause equipment failure, increasing the cost of repair and maintenance; finally, it will pollute the environment. A large amount of paper hair will be generated during the papermaking process and may enter the wastewater and exhaust gas, polluting the environment. The organic matter, cellulose, ink residue and other substances contained in the paper hair have a negative impact on the environment, increasing the difficulty and cost of wastewater treatment and exhaust gas treatment. Summary of the Invention

[0007] To this end, the technical problem to be solved by the present invention is to overcome the problem that paper fibers and paper powder are commonly present on the back of gray-based white board paper in the existing papermaking industry, and degradation and loss occur during the production process, which directly leads to a lower sales price of the finished product and higher production and maintenance costs.

[0008] In order to solve the above technical problems, the present invention provides a back-side gluing system for papermaking, comprising: a glue supply unit, a glue applying unit and a drying unit, wherein the glue supply unit is used to prepare glue used by the glue applying unit, the glue applying unit is used to apply glue on the paper surface, and the drying unit is used to dry the glue applied on the paper surface; wherein the glue applying unit comprises a glue applying machine frame, a first power source, a second power source, a third power source, a back roller, a back-side gluing feeding roller, a scraper, a first motor and a second motor, the first power source, the second power source, the third power source, the back roller, the back-side gluing feeding roller and the scraper are all arranged on the glue applying machine frame, the output end of the first power source is connected to the silo of the glue supply unit, and the first power source is used to adjust the lifting and lowering of the silo of the glue supply unit, the back roller and the back-side gluing feeding roller are connected to the silo of the glue supply unit, and the back roller and the back-side gluing feeding roller are connected to the silo of the glue supply unit. The paper passes between the rollers. The back roller is used to guide the paper. The back sizing roller is used to apply sizing material to the paper. The second power source is connected to the support frame of the back sizing roller and is used to adjust the distance between the back sizing roller and the back roller. The first motor is connected to the back sizing roller, and the back roller is mounted on the sizing machine frame. The second motor is connected to the back roller, and the second motor drives the back roller to rotate in the opposite direction to the direction driven by the first motor. The second motor drives the back roller to rotate and move the paper between the back roller and the back sizing roller. The output end of the third power source is connected to the scraper, and the third power source is used to adjust the angle between the scraper and the paper. The scraper contacts the surface of the paper and is used to scrape off excess fiber particles on the paper surface. The back sizing system for papermaking of the present invention is used to optimize the quality of various types of gray-based white paper, improve the first-grade product rate, and increase profits. The device effectively improves the quality of the finished product. The device can increase the first-grade product rate by 2%, achieve an annual output of 650,000 tons, and increase annual profits by 39 million yuan.

[0009] In one embodiment of the present invention, the sizing machine frame is further provided with a plurality of rope pulleys, the paper passes through between the plurality of rope pulleys, and the plurality of rope pulleys are used to guide the paper transmission.

[0010] In one embodiment of the present invention, the first power source, the second power source and the third power source are all hydraulic cylinders.

[0011] In one embodiment of the present invention, the drying unit includes an electric heating drying device and a steam heating drying device. The electric heating drying device is located on the side of the steam heating drying device close to the gluing unit. The paper glued by the gluing unit is first dried by the electric heating drying device and then dried by the steam heating drying device.

[0012] In one embodiment of the present invention, the electric heating and drying equipment includes an electric heater, a first blower and a first exhaust fan. The electric heater is used to release a heat source. The first blower is used to send air into the electric heater to be baked by the heat source to form hot air that is transported to the gluing unit for drying on the paper after gluing. The first exhaust fan is used to recover the exhaust air.

[0013] In one embodiment of the present invention, the steam heating and drying equipment includes a steam heater, a second blower and a second exhaust fan. The steam heater is used to form hot air through steam heating. The second blower is used to transport the heated hot air to the paper dried by the electric heating and drying equipment for drying. The second exhaust fan is used to exhaust air and recover it for reuse.

[0014] In one embodiment of the present invention, the glue supply unit includes a first raw material tank, a first feeding pump, a second raw material tank, a second feeding pump, a hot water delivery pipe, a feed trough, a feed bin and a third feeding pump. The first raw material tank is used to contain industrial corn starch, and the second raw material tank is used to contain surface glue additives. The industrial corn starch in the first raw material tank is transported to the feed trough by the first feeding pump, and the surface glue additives in the second raw material tank are transported to the feed trough by the second feeding pump. One end of the hot water delivery pipe is connected to a water source, and the other end of the hot water delivery pipe is connected to the feed trough. The feed trough is used to stir and mix the industrial corn starch, surface glue additives and hot water into glue. The glue in the feed trough is transported to the feed bin by the third feeding pump, and the feed bin is used to provide glue to the back glue feeding roller.

[0015] In one embodiment of the present invention, a filter is provided on the pipe connecting the feed trough and the feed bin, and the filter is used to filter impurities in the rubber material. A slag discharge port is provided at the lower end of the filter.

[0016] In one embodiment of the present invention, the glue supply unit also includes a glue recovery tank, a fourth feeding pump, a fifth feeding pump, a first vibrating screen and a second vibrating screen. The glue recovery tank is connected to the supply bin, and the glue recovery tank is used to recover the used glue in the supply bin. The glue recovery tank is divided into an independent first cavity and a second cavity. The upper end of the first cavity and the second cavity partition plate has a connecting channel. The second cavity is used to store used glue. The first cavity is used to store purified glue. The glue in the second cavity is transported to the first vibrating screen and the second vibrating screen respectively for screening and purification through the fifth feeding pump. The glue purified by the first vibrating screen and the second vibrating screen is transported to the first cavity, and the glue in the first cavity is transported to the supply trough through the fourth feeding pump.

[0017] In one embodiment of the present invention, the rubber recovery tank is provided with a sewage outlet.

[0018] The above technical solution of the present invention has the following beneficial effects compared with the prior art: The back-side sizing system for papermaking described in the present invention is modified by optimizing the circuit and adding a back-side sizing machine and drying equipment. First, a layer of glue is evenly applied to the paper by the back-side sizing machine, and then the paper is heated by the drying equipment to increase the dryness. The paper fibers and paper powder on the surface are solidified to prevent them from falling off. This is used to increase the first-grade product rate of gray-based white board paper. The equipment can effectively improve the quality of finished products and expand market share. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings, wherein: Figure 1 Schematic diagram of the overall structure of a back sizing system for papermaking in a preferred embodiment of the present invention; Figure 2 The structure of the gluing unit in the preferred embodiment of the present invention is shown in FIG. Figure 1 ; Figure 3 The structure of the gluing unit in the preferred embodiment of the present invention is shown in FIG. Figure 2 ; Figure 4 This is a structural diagram of a glue supply unit in a preferred embodiment of the present invention; Figure 5 Schematic diagram of the structure of the drying unit in a preferred embodiment of the present invention.

[0020] Description of the accompanying drawings: glue supply unit 100, first raw material tank 101, first feeding pump 102, second raw material tank 103, second feeding pump 104, hot water delivery pipe 105, feeding trough 106, feeding bin 107, third feeding pump 108, filter 109, glue recovery tank 110, fourth feeding pump 111, fifth feeding pump 112, first vibrating screen 113, second vibrating screen 114, first cavity 115, second cavity 116, glue application unit 200, Glue machine frame 201, first power source 202, second power source 203, third power source 204, back roller 205, back glue feeding roller 206, scraper 207, first motor 208, second motor 209, rope pulley 210, drying unit 300, electric heating drying equipment 301, steam heating drying equipment 302, electric heater 303, first blower 304, first exhaust fan 305, steam heater 306, second blower 307, second exhaust fan 308. DETAILED DESCRIPTION

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it. However, the embodiments are not intended to limit the present invention.

[0022] Reference Figure 1 As shown, the back sizing system for papermaking of the present invention includes: a glue supply unit 100, a glue applying unit 200 and a drying unit 300, the glue supply unit 100 is used to prepare glue used by the glue applying unit 200, the glue applying unit 200 is used to apply glue on the paper surface, and the drying unit 300 is used to dry the glue applied on the paper surface.

[0023] Reference Figure 2 、 3 As shown, the glue applying unit 200 includes a glue applying frame 201, a first power source 202, a second power source 203, a third power source 204, a back roller 205, a back glue applying feeding roller 206, a scraper 207, a first motor 208 and a second motor 209. The first power source 202, the second power source 203, the third power source 204, the back roller 205, the back glue applying feeding roller 206 and the scraper 207 are all arranged on the glue applying frame 201. The output end of the first power source 202 is connected to the material bin of the glue supply unit 100, and the first power source 202 is used to adjust the lifting of the material bin of the glue supply unit 100. Paper passes between the back roller 205 and the back glue applying feeding roller 206. The back roller 205 is used for paper guidance. The back glue applying feeding roller 206 is used to apply glue to the paper. The second power source 203 is connected to the back glue applying feeding roller The back glue feeding roller 205 is connected to the support frame of the roller 206, and the second power source 203 is used to adjust the distance between the back glue feeding roller 206 and the back roller 205. The first motor 208 is connected to the back glue feeding roller 206, and the back roller 205 is installed on the glue machine frame 201. The second motor 209 is connected to the back roller 205, and the rotation direction of the back roller 205 driven by the second motor 209 is opposite to the rotation direction of the back glue feeding roller 206 driven by the first motor 208. The second motor 209 drives the back roller 205 to rotate to drive the paper to move between the back roller 205 and the back glue feeding roller 206. The output end of the third power source 204 is connected to the scraper 207, and the third power source 204 is used to adjust the angle between the scraper 207 and the paper. The scraper 207 contacts the surface of the paper, and the scraper 207 is used to scrape off excess fiber particles on the surface of the paper. The glue machine frame 201 is further provided with a plurality of rope pulleys 210 , through which paper passes, and the plurality of rope pulleys 210 are used to guide paper transmission.

[0024] Preferably, the first power source 202 , the second power source 203 and the third power source 204 are all hydraulic cylinders.

[0025] Reference Figure 5 As shown, the drying unit 300 includes an electric heating drying device 301 and a steam heating drying device 302. The electric heating drying device 301 is located on the side of the steam heating drying device 302 close to the gluing unit 200. The paper glued by the gluing unit 200 is first dried by the electric heating drying device 301 and then dried by the steam heating drying device 302.

[0026] In the above structure, the electrically heated drying device 301 includes an electric heater 303, a first blower 304, and a first exhaust fan 305. The electric heater 303 is used to release heat, while the first blower 304 is used to send air into the electric heater 303, where it is heated by the heat source and then transported to the glue-applying unit 200 for drying. The first exhaust fan 305 is used to recycle the exhaust air. The electrically heated drying device 301 uses lamps to heat the paper, rapidly evaporating the moisture in the glue on the paper surface. The moisture is then circulated and cooled by the two blowers, the supply and exhaust fans.

[0027] In the above structure, the steam-heated drying equipment 302 includes a steam heater 306, a second blower 307, and a second exhaust fan 308. The steam heater 306 generates hot air through steam heating. The second blower 307 delivers the heated air to the paper dried in the electric-heated drying equipment 301 for drying. The second exhaust fan 308 recovers the exhausted air for reuse. The air is heated by 12 kg steam pressure and then fed into the bellows to dry the paper surface again. The air is then circulated and cooled by the two blowers, the supply and exhaust fans.

[0028] Reference Figure 4 As shown, the glue supply unit 100 includes a first raw material tank 101, a first feeding pump 102, a second raw material tank 103, a second feeding pump 104, a hot water delivery pipe 105, a feeding trough 106, a feeding bin 107 and a third feeding pump 108. The first raw material tank 101 is used to contain industrial corn starch, and the second raw material tank 103 is used to contain surface adhesive additives. The industrial corn starch in the first raw material tank 101 is transported to the feeding trough 106 by the first feeding pump 102, and the second raw material tank 103 is used to contain surface adhesive additives. The surface adhesive additive in the raw material tank 103 is delivered to the feed trough 106 via the second feed pump 104. One end of the hot water delivery pipe 105 is connected to a water source, and the other end of the hot water delivery pipe 105 is connected to the feed trough 106. The feed trough 106 is used to mix the industrial corn starch, the surface adhesive additive, and hot water into a sizing material. The sizing material in the feed trough 106 is delivered to the feed bin 107 via the third feed pump 108. The feed bin 107 is used to provide the sizing material to the back-side glue feeding roller 206. The first feed pump 102, the second feed pump 104, and the third feed pump 108 can all be set up in pairs, with one of them as a backup to ensure normal operation of the equipment in case the other one fails.

[0029] In the above structure, a filter 109 is provided on the pipe connecting the feed trough 106 and the feed bin 107. The filter 109 is used to filter impurities in the rubber material. A slag discharge port is provided at the lower end of the filter 109. The dirty liquid in the filter 109 enters the ditch through the slag discharge system.

[0030] In addition, the glue supply unit 100 also includes a glue recovery tank 110, a fourth feeding pump 111, a fifth feeding pump 112, a first vibrating screen 113 and a second vibrating screen 114. The glue recovery tank 110 is connected to the supply bin 107 and is used to recover the glue used in the supply bin 107. The glue recovery tank 110 is divided into an independent first cavity 115 and a second cavity 116. The upper end of the partition plate of the first cavity 115 and the second cavity 116 has a connecting The second cavity 116 is used to store used rubber, and the first cavity 115 is used to store purified rubber. The rubber in the second cavity 116 is respectively transported to the first vibrating screen 113 and the second vibrating screen 114 for screening and purification by the fifth feeding pump 112. The rubber purified by the first vibrating screen 113 and the second vibrating screen 114 is transported to the first cavity 115, and the rubber in the first cavity 115 is transported to the feed trough 106 by the fourth feeding pump 111. The rubber recovery tank 110 is provided with a sewage outlet. Two fourth feeding pumps 111 and fifth feeding pumps 112 are provided, one of which is a spare to ensure normal use of the equipment in case the other is damaged.

[0031] The working principle of the back sizing system for papermaking of the present invention is: 1. By using industrial corn starch, surface adhesive, water and steam, stirring in the feed tank 106, the powdered solid is turned into liquid, and the steam and water are used to fully dissolve it. When the concentration reaches the set concentration; 2. The rubber material is pumped into the filter 109 by the third feeding pump 108. The main principle of the filter 109 is to pump the rubber material into the feed side of the feed bin 107 through the effect of centrifugal separation; 3. The rubber material on the operating side of the feed bin 107 flows into the rubber material recovery tank 110. At this time, the rubber material is mixed with paper fibers and paper powder to become dirty rubber; 4. The dirty rubber material is pumped into the first vibrating screen 113 via the fifth feed pump 112. The principle of the vibrating screen is to adjust the amplitude of the swing by the angle of the counterweight. The paper fibers and powder in the rubber material are filtered out by the vibration and sent to the slag discharge system. The clean rubber liquid passes through the screen and enters the second vibrating screen 114. The working principle is the same. 5. The clean rubber material after screening is pumped back into the feed trough 106 through the circulation pump and recycled.

[0032] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A back sizing system for papermaking, characterized in that: include: A glue supply unit, a glue application unit, and a drying unit. The glue supply unit is used to prepare glue for the glue application unit, the glue application unit is used to apply glue on the paper surface, and the drying unit is used to dry the glue applied on the paper surface. Wherein, the gluing unit includes a gluing machine frame, a first power source, a second power source, a third power source, a back roller, a back gluing feeding roller, a scraper, a first motor and a second motor, the first power source, the second power source, the third power source, the back roller, the back gluing feeding roller and the scraper are all arranged on the gluing machine frame, the output end of the first power source is connected to the material bin of the glue supply unit, and the first power source is used to adjust the lifting of the material bin of the glue supply unit, paper passes between the back roller and the back gluing feeding roller, the back roller is used for paper guidance, the back gluing feeding roller is used to apply glue to the paper, the second power source is connected to the back gluing feeding roller The support frame is connected, and the second power source is used to adjust the distance between the back glue feeding roller and the back roller, the first motor is connected to the back glue feeding roller, and the back roller is installed on the glue machine frame, the second motor is connected to the back roller, and the second motor drives the back roller to rotate in a direction opposite to the direction of rotation of the first motor drives the back glue feeding roller, the second motor drives the back roller to rotate to drive the paper to move between the back roller and the back glue feeding roller, the output end of the third power source is connected to the scraper, and the third power source is used to adjust the angle between the scraper and the paper, the scraper is in contact with the surface of the paper, and the scraper is used to scrape off excess fiber particles on the surface of the paper.

2. The back sizing system for papermaking according to claim 1, characterized in that: The glue machine frame is also provided with a plurality of rope wheels, through which paper passes, and the plurality of rope wheels are used for guiding the paper to be transported.

3. The back sizing system for papermaking according to claim 1, characterized in that: The first power source, the second power source and the third power source are all hydraulic cylinders.

4. The back sizing system for papermaking according to claim 1, characterized in that: The drying unit includes an electric heating drying device and a steam heating drying device. The electric heating drying device is located on the side of the steam heating drying device close to the gluing unit. The paper glued by the gluing unit is first dried by the electric heating drying device and then by the steam heating drying device.

5. The back sizing system for papermaking according to claim 4, characterized in that: The electric heating and drying equipment includes an electric heater, a first air supply fan and a first exhaust fan. The electric heater is used to release a heat source. The first air supply fan is used to send air into the electric heater to be baked by the heat source to form hot air that is transported to the gluing unit for drying on the paper after gluing. The first exhaust fan is used to recover the exhaust air.

6. The back sizing system for papermaking according to claim 5, characterized in that: The steam heating and drying equipment includes a steam heater, a second blower and a second exhaust fan. The steam heater is used to form hot air through steam heating. The second blower is used to transport the heated hot air to the paper dried by the electric heating and drying equipment for drying. The second exhaust fan is used to exhaust air and recover it for reuse.

7. The back sizing system for papermaking according to claim 1, characterized in that: The glue supply unit includes a first raw material tank, a first feeding pump, a second raw material tank, a second feeding pump, a hot water delivery pipe, a feed trough, a feed bin and a third feeding pump. The first raw material tank is used to contain industrial corn starch, and the second raw material tank is used to contain a surface glue auxiliary agent. The industrial corn starch in the first raw material tank is transported to the feed trough by the first feeding pump, and the surface glue auxiliary agent in the second raw material tank is transported to the feed trough by the second feeding pump. One end of the hot water delivery pipe is connected to a water source, and the other end of the hot water delivery pipe is connected to the feed trough. The feed trough is used to stir and mix the industrial corn starch, the surface glue auxiliary agent and hot water into glue. The glue in the feed trough is transported to the feed bin by the third feeding pump, and the feed bin is used to provide glue to the back glue feeding roller.

8. The back sizing system for papermaking according to claim 7, characterized in that: A filter is provided on the pipeline connecting the feed trough and the feed bin, and the filter is used to filter impurities in the rubber material. A slag discharge port is provided at the lower end of the filter.

9. The back sizing system for papermaking according to claim 8, characterized in that: The glue supply unit also includes a glue recovery tank, a fourth feeding pump, a fifth feeding pump, a first vibrating screen and a second vibrating screen. The glue recovery tank is connected to the supply bin and is used to recover the glue used in the supply bin. The glue recovery tank is divided into an independent first cavity and a second cavity. The upper end of the first cavity and the second cavity partition plate has a connecting channel. The second cavity is used to store used glue. The first cavity is used to store purified glue. The glue in the second cavity is transported to the first vibrating screen and the second vibrating screen respectively for screening and purification through the fifth feeding pump. The glue purified by the first vibrating screen and the second vibrating screen is transported to the first cavity, and the glue in the first cavity is transported to the supply trough through the fourth feeding pump.

10. The back sizing system for papermaking according to claim 9, characterized in that: The rubber material recovery tank is provided with a sewage outlet.

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