In recent years, China's paper industry has developed rapidly. However, the shortage of raw materials, serious environmental pollution, and lack of energy have constrained the development of the paper industry to some extent. The waste paper raw materials known as "urban forests" are increasingly being taken seriously by domestic and foreign large road companies. Extensive recycling of waste paper is an effective way for the pulp and paper industry at home and abroad to expand production scale, save energy, improve economic efficiency, and create social benefits.
1. The overall requirements of modern waste paper processing equipment At present, there are various types of waste paper. Because the types of products produced and the process flow adopted are not the same, the paper produced by waste paper is quite different, but various types of modern waste paper are different. Processing equipment requirements have their common characteristics.
1. As far as possible, the fibers in the waste paper should not be subjected to a large degree of operation, requiring high efficiency in the disintegration and desorption of equipment, saving power, and ensuring the physical refusal indicators.
2. Light and heavy impurities in waste paper should be removed as soon as possible. The equipment such as screening and deslagging should be highly efficient. The disintegration equipment should separate the fibers as much as possible without hitting impurities.
3. Restore the original whiteness of waste paper as much as possible, use high-efficiency flotation, washing and bleaching equipment to separate fibers and ink, and ink residue and waste water are easy to handle.
4. Simplify the pulping process, reduce the consumption of water, electricity, gas, and medicine, increase the slurry yield, and reduce costs.
2. Two typical waste paper processing process analysis China's use of waste paper to produce paperboard and medium and high-grade cultural paper, although it started late, but it has developed rapidly. In recent years, a feasible process has been formed, and domestic equipment support is also basic. To meet the needs of its technology, can replace imports, and the price is only 1/5-1/7 of imported equipment, which has created favorable conditions for the full use of waste paper at home and abroad, and has been recognized by users.
1. The use of old corrugated box (OCC) production of cardboard process flow:
Return to sediment well → Impurity separator → Cylinder screen → Hydraulic pulper
Wastepaper → Hydraulic Pulper → High Concentrate Cleaner → Duplex Fiber Separator → High Concentration Pressure Sieve │ │
┌─→Light Slag Separator â†-──┴──────┘
│
Medium concentration cleaners → pressure screens (fine screens) → low concentration cleaners → Gravity rotary screen concentrators or secondary pulpers → Oblique spiral concentrators → Screw presses → Thermal dispersers → Next steps.
The main features of the process are the analysis of the repulping system. It consists of a hydraulic pulper, a deep slag well, an impurity separator, and a cylinder screen. Waste paper is fed to a hydraulic pulper through a belt conveyor. The hydraulic pulper is generally used. Energy-saving PSVokds rotor, waste paper is disintegrated under the mechanical action and shearing action of the rotor blades, and the concentration is generally controlled below 3% for continuous operation. The crushed slurry is pumped out and sent to a high consistency cleaner. The hydraulic pulper tank is equipped with a heavy slag hole. The heavy impurities in the waste paper enter the sedimentation well from the heavy slag hole, and part of the fiber and light impurities are separated and floated into the sediment separator to enter the impurity separator. Under the action of its rotor, The slurry is passed through the sieves and separated into the previous process. The coarse debris and some fibers are trapped in the impurity separator. After being flushed, they are sent to the cylindrical sieve for dewatering and discharged. The cylinder sieve recovers the fibers and feeds them to the hydraulic pulper. The pulper Continuous operation is generally equipped with a rope twister, which effectively removes coarse impurities such as iron wire, string, and cotton yarn in waste paper.
The combination of several devices in the system can avoid the fine-grained impurities in the pulping process, reduce the burden on the equipment after the sequence, and improve the processing capacity of the disintegration system.
Coarse screening system: including high concentration slag remover and double fiber separator. Deep pressure screen, medium concentration cleaner, light residue separator. The main function of this system is to separate and remove lighter and heavy impurities of larger size contained in the disintegrated slurry. First, the disintegrated slurry enters the high-concentrate cleaner in a tangential direction under a certain pressure. Due to the heavy weight and large inertia, it is not easily affected by slurry scouring and moves with the slurry. Using the eddy current principle, various heavy impurities such as staples and stones can be effectively removed at concentrations of 3-5%. It is a protective device and is therefore placed at the front of the process to protect the device from being damaged. damage.
The slurry after high deconcentration dregs is pumped into the multi-fiber separator, and the multi-fiber separator integrates slag removal, slag removal and screening functions, and can further dissipate the paper that has not been completely disintegrated after disintegration. , And can effectively go to the team and residual sand, gravel and other heavy slag as well as plastic, polystyrene foam, some stickies and other light impurities, reduce the burden on the screening equipment, after the slurry into the high pressure sieve, tailings and light Impurities enter the light residue separator.
The main function of the light slag separator is to process the tailings and light impurities of the compound fiber separator, the concentrated pressure screen, the pressure finishing screen, and to remove the polystyrene foam, plastic sheet and part of the adhesive, and recover the fiber by using the principle of uplift eddy current. .
Fine screening system: It is composed of a two-stage pressure fine screen, a low-consistency slag remover, and a gravity-type rotary screen compactor or a secondary pulp washer. The function of this system is to remove fine impurities that have not been removed in the rough screening and high concentration cleaner system. The pressure fine sieve is generally selected by the corrugated sieve, and the high-concentration pressure sieve (hole sieve) in the previous process can effectively remove large, long-shaped or sheet-shaped impurities, and can also remove the group of impurities, adhesive Impurities, fiber bundles and other small impurities. Light impurities are sent to the light slag separator and the slurry is pumped to a low consistency cleaner.
The low-concentrate slag cleaner here is mainly to remove fine light impurities such as polystyrene foam, plastic sheets and part of stickies. The role of gravity rotary screen thickener or secondary pulp washer is to use washing on the one hand. The method further removes the impurities and dust from the slurry, and on the other hand concentrates the slurry to the concentration required for the thermal dispersion system.
Thermal dispersion system: After the hot slurry is processed by the previous process, more than 90% of the impurities are removed, but the adhesive impurities in the waste paper still remain in the pulp, such as grease, paraffin, plastic, rubber, asphalt, etc. In addition to the slag removal process, if no measures are taken, these hot melted products will be melted at high temperature after drying in the papermaking process. This will not only cause problems such as sticking cylinders and decapitation, but also cause different degrees of hot-melt spots on the surface of the paper. Affects the appearance of the paper directly. The function of the thermal dispersion system is to disperse these impurities into noise spots that cannot be seen by the human eye below 40 μm. It includes three types of equipment: oblique spiral thickeners, screw presses, and heat dispersers. The concentration of slurry spiral helix concentrator and screw pulper is increased to about 30%, and it is sent to a thermal disperser. The heat disperser has a special-shaped stator and rotor, and it is strongly pressed and rubbed in the heated state, and the former The adhesive impurities that have not been removed in the process are hot-melt dispersed and uniformly distributed in the slurry. Heating about 90 °C temperature, can basically maintain the characteristics of the fiber.
Summarizing the following analysis, the new technologies used in the above processes include the following aspects: The disintegration of the pulping system is carried out to remove coarse impurities as soon as possible to avoid impurity interference and fine-grained impurities, and to reduce the burden on subsequent equipment and improve the system's production capacity; Level screening, remove all kinds of impurities as much as possible to reduce the burden of thermal dispersion system; screening system can be removed from the fine to the fine, from big to small, from heavy to light, from more to less, from the effective order It is beneficial to the screening of impurities; the use of thermal dispersion technology can disperse hard-to-remove hot-melt materials, improve the appearance quality of the paper and the operating performance of the paper machine. It can also be said that the heat disperser is the last system to process all kinds of impurities. Check the equipment. (Shandong Jining Light Industry Machinery Factory Liu Wei) (Extracted from "Business Express")
1. The overall requirements of modern waste paper processing equipment At present, there are various types of waste paper. Because the types of products produced and the process flow adopted are not the same, the paper produced by waste paper is quite different, but various types of modern waste paper are different. Processing equipment requirements have their common characteristics.
1. As far as possible, the fibers in the waste paper should not be subjected to a large degree of operation, requiring high efficiency in the disintegration and desorption of equipment, saving power, and ensuring the physical refusal indicators.
2. Light and heavy impurities in waste paper should be removed as soon as possible. The equipment such as screening and deslagging should be highly efficient. The disintegration equipment should separate the fibers as much as possible without hitting impurities.
3. Restore the original whiteness of waste paper as much as possible, use high-efficiency flotation, washing and bleaching equipment to separate fibers and ink, and ink residue and waste water are easy to handle.
4. Simplify the pulping process, reduce the consumption of water, electricity, gas, and medicine, increase the slurry yield, and reduce costs.
2. Two typical waste paper processing process analysis China's use of waste paper to produce paperboard and medium and high-grade cultural paper, although it started late, but it has developed rapidly. In recent years, a feasible process has been formed, and domestic equipment support is also basic. To meet the needs of its technology, can replace imports, and the price is only 1/5-1/7 of imported equipment, which has created favorable conditions for the full use of waste paper at home and abroad, and has been recognized by users.
1. The use of old corrugated box (OCC) production of cardboard process flow:
Return to sediment well → Impurity separator → Cylinder screen → Hydraulic pulper
Wastepaper → Hydraulic Pulper → High Concentrate Cleaner → Duplex Fiber Separator → High Concentration Pressure Sieve │ │
┌─→Light Slag Separator â†-──┴──────┘
│
Medium concentration cleaners → pressure screens (fine screens) → low concentration cleaners → Gravity rotary screen concentrators or secondary pulpers → Oblique spiral concentrators → Screw presses → Thermal dispersers → Next steps.
The main features of the process are the analysis of the repulping system. It consists of a hydraulic pulper, a deep slag well, an impurity separator, and a cylinder screen. Waste paper is fed to a hydraulic pulper through a belt conveyor. The hydraulic pulper is generally used. Energy-saving PSVokds rotor, waste paper is disintegrated under the mechanical action and shearing action of the rotor blades, and the concentration is generally controlled below 3% for continuous operation. The crushed slurry is pumped out and sent to a high consistency cleaner. The hydraulic pulper tank is equipped with a heavy slag hole. The heavy impurities in the waste paper enter the sedimentation well from the heavy slag hole, and part of the fiber and light impurities are separated and floated into the sediment separator to enter the impurity separator. Under the action of its rotor, The slurry is passed through the sieves and separated into the previous process. The coarse debris and some fibers are trapped in the impurity separator. After being flushed, they are sent to the cylindrical sieve for dewatering and discharged. The cylinder sieve recovers the fibers and feeds them to the hydraulic pulper. The pulper Continuous operation is generally equipped with a rope twister, which effectively removes coarse impurities such as iron wire, string, and cotton yarn in waste paper.
The combination of several devices in the system can avoid the fine-grained impurities in the pulping process, reduce the burden on the equipment after the sequence, and improve the processing capacity of the disintegration system.
Coarse screening system: including high concentration slag remover and double fiber separator. Deep pressure screen, medium concentration cleaner, light residue separator. The main function of this system is to separate and remove lighter and heavy impurities of larger size contained in the disintegrated slurry. First, the disintegrated slurry enters the high-concentrate cleaner in a tangential direction under a certain pressure. Due to the heavy weight and large inertia, it is not easily affected by slurry scouring and moves with the slurry. Using the eddy current principle, various heavy impurities such as staples and stones can be effectively removed at concentrations of 3-5%. It is a protective device and is therefore placed at the front of the process to protect the device from being damaged. damage.
The slurry after high deconcentration dregs is pumped into the multi-fiber separator, and the multi-fiber separator integrates slag removal, slag removal and screening functions, and can further dissipate the paper that has not been completely disintegrated after disintegration. , And can effectively go to the team and residual sand, gravel and other heavy slag as well as plastic, polystyrene foam, some stickies and other light impurities, reduce the burden on the screening equipment, after the slurry into the high pressure sieve, tailings and light Impurities enter the light residue separator.
The main function of the light slag separator is to process the tailings and light impurities of the compound fiber separator, the concentrated pressure screen, the pressure finishing screen, and to remove the polystyrene foam, plastic sheet and part of the adhesive, and recover the fiber by using the principle of uplift eddy current. .
Fine screening system: It is composed of a two-stage pressure fine screen, a low-consistency slag remover, and a gravity-type rotary screen compactor or a secondary pulp washer. The function of this system is to remove fine impurities that have not been removed in the rough screening and high concentration cleaner system. The pressure fine sieve is generally selected by the corrugated sieve, and the high-concentration pressure sieve (hole sieve) in the previous process can effectively remove large, long-shaped or sheet-shaped impurities, and can also remove the group of impurities, adhesive Impurities, fiber bundles and other small impurities. Light impurities are sent to the light slag separator and the slurry is pumped to a low consistency cleaner.
The low-concentrate slag cleaner here is mainly to remove fine light impurities such as polystyrene foam, plastic sheets and part of stickies. The role of gravity rotary screen thickener or secondary pulp washer is to use washing on the one hand. The method further removes the impurities and dust from the slurry, and on the other hand concentrates the slurry to the concentration required for the thermal dispersion system.
Thermal dispersion system: After the hot slurry is processed by the previous process, more than 90% of the impurities are removed, but the adhesive impurities in the waste paper still remain in the pulp, such as grease, paraffin, plastic, rubber, asphalt, etc. In addition to the slag removal process, if no measures are taken, these hot melted products will be melted at high temperature after drying in the papermaking process. This will not only cause problems such as sticking cylinders and decapitation, but also cause different degrees of hot-melt spots on the surface of the paper. Affects the appearance of the paper directly. The function of the thermal dispersion system is to disperse these impurities into noise spots that cannot be seen by the human eye below 40 μm. It includes three types of equipment: oblique spiral thickeners, screw presses, and heat dispersers. The concentration of slurry spiral helix concentrator and screw pulper is increased to about 30%, and it is sent to a thermal disperser. The heat disperser has a special-shaped stator and rotor, and it is strongly pressed and rubbed in the heated state, and the former The adhesive impurities that have not been removed in the process are hot-melt dispersed and uniformly distributed in the slurry. Heating about 90 °C temperature, can basically maintain the characteristics of the fiber.
Summarizing the following analysis, the new technologies used in the above processes include the following aspects: The disintegration of the pulping system is carried out to remove coarse impurities as soon as possible to avoid impurity interference and fine-grained impurities, and to reduce the burden on subsequent equipment and improve the system's production capacity; Level screening, remove all kinds of impurities as much as possible to reduce the burden of thermal dispersion system; screening system can be removed from the fine to the fine, from big to small, from heavy to light, from more to less, from the effective order It is beneficial to the screening of impurities; the use of thermal dispersion technology can disperse hard-to-remove hot-melt materials, improve the appearance quality of the paper and the operating performance of the paper machine. It can also be said that the heat disperser is the last system to process all kinds of impurities. Check the equipment. (Shandong Jining Light Industry Machinery Factory Liu Wei) (Extracted from "Business Express")
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