CN107460764B - High-quality paper web papermaking process - Google Patents
High-quality paper web papermaking process Download PDFInfo
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- CN107460764B CN107460764B CN201710820501.8A CN201710820501A CN107460764B CN 107460764 B CN107460764 B CN 107460764B CN 201710820501 A CN201710820501 A CN 201710820501A CN 107460764 B CN107460764 B CN 107460764B
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
- D21F11/002—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines by using a foamed suspension
Abstract
The invention provides a high-quality paper web papermaking process, aiming at solving the technical problems of filler loss and poor retention in the slurry dehydration process compared with the traditional papermaking process, the papermaking process is characterized in that a filtering process is added before papermaking slurry is spread on a forming net, the papermaking slurry is filtered by a filter screen through the filter screen, so that thicker and longer fibers are filtered, the consistency of the thickness and the length of the fibers is further ensured, the mesh number of meshes on the forming net can be reduced, excessive filler loss is avoided, meanwhile, by adding a defoaming process, the forming net which is not subjected to paper manufacturing is coated with water and filler contained in the filter screen, bubbles on the forming net are removed, and a layer of filler is coated on the forming net in advance to improve the quality of the formed paper.
Description
Technical Field
The invention relates to the field of body paper forming technology in a papermaking process, in particular to a high-quality paper web papermaking process.
Background
The stock used in papermaking is a complex, heterogeneous compound of fibres, fines, fillers and other additives, the properties of all of which are constantly changing, which may cause confusion during processing, and it is further complicated that the major part of the papermaking stock is not turned into paper when it is first conveyed through the line, but that the stock is dewatered on the forming wire, but that the fines and fillers are lost through the forming wire along with water during dewatering, at least with poor retention.
In addition, the sources of the fibers and fine fibers used for papermaking are generally some fiber raw materials such as hardwood pulp, recycled fibers or agricultural fibers, and the fiber raw materials are more or less heterogeneous, and the fibers contained in the fiber raw materials are different in thickness degree, so that the fiber raw materials are directly used on a forming wire mesh, and the quality of formed paper is easily reduced.
In us patent application No. 4,781,793, a method is disclosed for improving paper properties, especially paper retention, in which a basic stock is separated into two separate fractions on the basis of fiber length and the fibers in each constituent are treated according to a specific purpose, but it does not disclose a corresponding paper machine or paper system and paper making process.
Disclosure of Invention
Aiming at the problems, the invention provides a high-quality paper web papermaking process, compared with the traditional papermaking process, the papermaking process is characterized in that a filtering process is added before papermaking slurry is spread on a forming net, the papermaking slurry is filtered by the filter screen, so that thicker and longer fibers are filtered, the consistency of the thickness and the length of the fibers is further ensured, the mesh number of meshes on the forming net can be reduced, the loss of excessive filler is avoided, the technical problem that the filler is lost and the retention force is poor in the slurry dehydration process is solved, meanwhile, the forming net which is not subjected to paper manufacturing is coated by the moisture and the filler contained in the filter screen through the addition of a defoaming process, the bubbles on the forming net are removed, and a layer of filler is coated on the forming net in advance to improve the quality of the formed paper.
In order to achieve the purpose, the invention provides the following technical scheme:
a high quality paper web papermaking process comprising:
step one, a feeding process, wherein papermaking slurry is pumped from a slurry box to a plurality of feeding pipes by a feeding pump and sprayed on a filtering area of a filter screen by the feeding pipes;
step two, a floating process, namely rolling and smearing the papermaking slurry on the filtering area by a floating roller which rolls back and forth along the sliding chute;
step three, a filtering process, namely, the papermaking slurry smoothed by the smoothing roller passes through a filtering area of the filter screen, and the papermaking slurry is filtered by the filtering area and then is spread on the forming screen;
step four, a water squeezing procedure, namely, conveying the papermaking pulp spread on the forming net to a water squeezing station positioned at the rear side of the filtering area under the driving of the forming net, driving a dewatering roller to rotate and squeeze the papermaking pulp by a dewatering motor, and squeezing out the water in the papermaking pulp;
step five, a water absorption process, namely conveying the papermaking pulp subjected to the water squeezing work to a water absorption station positioned at the rear side of the dewatering roll under the driving of a forming net, and driving a water absorption plate to absorb water in vacuum by a vacuum water absorption pump so as to form the papermaking pulp into base paper;
and step six, an output procedure, namely, after the papermaking pulp is dehydrated and formed into base paper, the base paper is continuously conveyed to an output station positioned at the rear side of the water absorption station through a forming net 2 and is output.
As an improvement, the method further comprises the following steps:
and step seven, a defoaming procedure, wherein before the papermaking slurry is spread on the forming net, the forming net is subjected to friction humidification by a filter screen, so that the forming net contains water and bubbles contained in the meshes of the forming net are removed.
In the seventh step, the water on the filter screen comes from the water contained in the papermaking pulp in the third step.
In the first step, the diameter of the discharge holes on the plurality of feed pipes is gradually reduced along the conveying direction of the forming net.
In the second step, the driving force for rolling the leveling roller is derived from the driving force for driving the filter screen to rotate.
As an improvement, in the third step, a rotating cleaning roller is arranged at the tail end of the filtering area, and a plurality of brushes on the cleaning roller clean the filtering net which finishes the filtering work.
As an improvement, in the third step, a cleaning groove is arranged behind the cleaning roller, and the coarse fibers on the brush needles are cleaned through the insertion and matching of a plurality of scraping grooves on the cleaning groove and the brush needles.
In the third step, the driving force of the cleaning roller is derived from the driving force for driving the forming wire to rotate.
As an improvement, in the fourth step, the vertical distance between the dewatering rolls and the forming wire is set in a descending manner along the conveying direction of the forming wire.
In the fifth step, a plurality of water suction grooves on the water suction plate are arranged from dense to sparse along the conveying direction of the forming wire.
The invention has the beneficial effects that:
(1) according to the invention, the filter screen which runs in a reverse direction relatively is arranged at the input end of the forming screen, and the papermaking pulp is filtered by using the filter screen, so that thicker and longer fibers are filtered, the consistency of the thickness and length of the fibers is further ensured, the mesh number of meshes on the forming screen can be reduced, the loss of excessive fillers is avoided, the retention force of the pulp when the pulp is formed into base paper is improved, and the quality of formed paper is improved;
(2) according to the invention, the forming net before paper manufacturing is coated with the water and the filler contained in the filter screen, bubbles on the forming net are removed, the problem that the slurry is not uniformly distributed due to the fact that the bubbles are broken when the slurry is formed into the base paper is solved, and a layer of filler is coated on the forming net in advance to improve the retention force of the forming paper on the forming net and further improve the quality of the forming paper;
(3) the invention arranges the floating mechanism in the endless mesh ring formed by the filter screen, drives the floating mechanism to operate by the circulating transmission of the filter screen, carries out rolling floating on the slurry input to the filter screen, uniformly extrudes the slurry to enter the forming mesh through the filter screen, and uniformly lays the slurry on the forming mesh;
(4) according to the invention, the cleaning mechanism is used for cleaning the thicker and longer fibers filtered out from the filter screen, so that the meshes of the filter screen are always smooth, the blockage is avoided, and meanwhile, the thicker and longer fibers filtered out can be used for paper with other qualities after being recovered by the cleaning mechanism, so that the waste of raw materials is reduced;
in conclusion, the invention has the advantages of ingenious structure, high utilization degree of papermaking materials, high quality of formed paper and the like, and is particularly suitable for the field of the formation of base paper in the papermaking process.
Drawings
FIG. 1 is a schematic view of the process of the present invention;
FIG. 2 is a schematic front view of the present invention;
FIG. 3 is a schematic cross-sectional view of the present invention;
FIG. 4 is a perspective view of the feeding mechanism of the present invention;
FIG. 5 is a schematic view of the bottom of the feed tube of the present invention;
FIG. 6 is a schematic perspective view of the troweling mechanism according to the present invention;
FIG. 7 is a schematic perspective view of the cleaning mechanism of the present invention;
FIG. 8 is a schematic perspective view of a cleaning tank according to the present invention;
FIG. 9 is a schematic perspective view of a water absorption plate according to the present invention;
FIG. 10 is a schematic view of the waste water recovering apparatus according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Example 1:
as shown in fig. 1, a high quality paper web papermaking process comprises:
step one, a feeding process, in which papermaking slurry is pumped from a slurry tank 411 to a plurality of feeding pipes 412 by a feeding pump 413 and sprayed on the filtering area 31 of the filter screen 3 by the feeding pipes 412;
step two, a floating process, in which the papermaking slurry reaching the filtering area 31 is coated in a rolling manner by a floating roller 422 rolling back and forth along a chute 4211;
step three, a filtering process, namely, the papermaking slurry smoothed by the smoothing roller 422 passes through the filtering area 31 of the filter screen 3, and the papermaking slurry is filtered by the filtering area 31 and then is spread on the forming screen 2;
step four, a water squeezing procedure, namely, the papermaking pulp spread on the forming net 2 is driven by the forming net 2 to be conveyed to a water squeezing station positioned at the rear side of the filtering area 31, and a dewatering motor 52 drives a dewatering roller 51 to rotate and squeeze the papermaking pulp to squeeze water in the papermaking pulp;
step five, a water absorption process, namely, the papermaking pulp after completing the water squeezing work is driven by a forming net 2 to be conveyed to a water absorption station positioned at the rear side of a dewatering roller 51, and a vacuum water absorption pump 61 drives a water absorption plate 62 to carry out vacuum water absorption on the papermaking pulp so as to form the papermaking pulp into base paper;
and step six, an output procedure, namely, after the papermaking pulp is dehydrated and formed into base paper, the base paper is continuously conveyed to an output station positioned at the rear side of the water absorption station through a forming net 2 and is output.
Wherein, a high-quality paper web papermaking process, still includes:
and step seven, a defoaming procedure, wherein before the papermaking slurry is spread on the forming net 2, the forming net 2 is subjected to friction and humidification by a filter screen 3, so that the forming net 2 contains water to remove bubbles contained in meshes of the forming net 2.
Further, in the seventh step, the water on the filter screen 3 comes from the water contained in the papermaking pulp in the third step.
In a preferred embodiment, in the first step, the diameter of the discharge holes 4121 of the plurality of supply pipes 412 is gradually decreased along the conveying direction of the forming wire 2.
It should be noted that the diameter of the discharge holes 4121 formed in the feeding pipe 412 is smaller and smaller along the conveying direction of the charging area 212, and this arrangement is because the slurry is deposited on the charging area 212 through the filter screen 3 in the early stage, and if the diameter of the discharge holes 4121 is kept uniform, the slurry added in the later stage is likely to cause the slurry added in the early stage to flow out through the forming wire 2, which results in the waste of the slurry.
In a preferred embodiment, in the second step, the driving force for rolling the troweling roller 422 is derived from the driving force for driving the filter net 3 to rotate.
As a modified solution, in the third step, a rotating cleaning roller 431 is provided at the end of the filtering zone 31, and a plurality of brush needles 4311 on the cleaning roller 431 clean the filter screen 3 after the filtering work is completed.
Further, in the third step, a cleaning groove 432 is arranged behind the cleaning roller 431, and the coarse fibers on the brush needles 4311 are cleaned by inserting and matching a plurality of scraping grooves 4321 on the cleaning groove 432 with the brush needles 4311.
Further, in the third step, the driving force of the cleaning roller 431 is derived from the driving force for driving the forming wire 2 to rotate.
In a preferred embodiment, the vertical distance from the dewatering roll 51 to the forming wire 2 in the fourth step is set in a decreasing manner in the conveying direction of the forming wire 2.
In the process of squeezing and dewatering the slurry by the dewatering roll 51, the vertical distance between the dewatering roll 51 and the dewatering zone 213 is gradually reduced along with the conveying direction of the dewatering zone 213 because the thickness of the slurry is gradually reduced due to the gradual reduction of the moisture in the slurry, and the moisture in the slurry can be squeezed out as much as possible.
In the fifth step, a plurality of water suction grooves 621 of the water suction plate 62 are arranged from dense to sparse along the conveying direction of the forming wire 2.
Because in the transportation process of the water absorption area 214, the water of the pulp along the transportation direction of the water absorption area 214 is less and less, and the weight of the pulp is lighter and lighter, if a larger suction force is provided like the input end of the water absorption area 214, the uniformity of the pulp is damaged, therefore, the water absorption groove 621 is arranged from dense to sparse along the transportation direction of the water absorption area 214, the suction force of the front section of the water absorption area 214 is large, the suction force of the rear section is small, the uniformity of the pulp is ensured, and the quality of the formed paper is ensured.
Example 2:
as shown in fig. 2 and 3, a high-quality paper web making system includes a machine frame 1, the machine frame 1 is in an L-shaped arrangement, and includes a first installation part 11 arranged transversely and a second installation part 12 arranged vertically, and further includes:
a forming wire 2, wherein the forming wire 2 is horizontally arranged on the first installation part 11 in a surrounding manner, forms an endless wire ring which is uniformly meshed, and forms a paper making area 21 at the upper area;
a filter screen 3, wherein the filter screen 3 is horizontally arranged on the second mounting part 12 in a surrounding manner, forms an endless screen ring, is positioned above the input end of the paper making area 21, is uniformly distributed with meshes, the mesh number of the meshes of the filter screen 3 is larger than that of the meshes of the forming screen 2, and the conveying direction of the lower end area of the filter screen 3 is opposite to the conveying direction of the paper making area 21;
a feeding device 4, said feeding device 4 being located at the input of said paper making zone 21, said feeding device 4 feeding said forming wire 2 and smoothing the pulp;
the rolling dehydration device 5 is arranged at the rear side of the feeding device 4, and is used for performing rolling dehydration on the pulp on the paper making area 21; and
and the vacuum vibration water absorption device 6 is arranged in the middle of the first installation part 11 and is positioned at the lower part of the papermaking area 21, and the vacuum vibration water absorption device 6 absorbs water of the pulp on the papermaking area 21.
The feeding device 4 feeds the paper making area 21, the pulp first enters an endless mesh ring formed by the filter screen 3, is filtered by the filter screen 3 to filter out coarse and long fibers contained in the pulp, then enters the paper making area 21 of the forming screen 2, and is conveyed by the forming screen 2 to be dehydrated by the rolling dehydration device 5 and the vacuum vibration water absorption device 6 in sequence, and then is formed into raw paper on the forming screen 2.
It is further described that the forming net 2 is driven by the first motor 20 in a belt transmission manner for rotary conveying, and the filter net 3 is driven by the second motor 30 in a belt transmission manner for rotary conveying.
As shown in fig. 3, the paper making area 21 comprises, in sequence along its conveying direction:
the defoaming area 211 is positioned at the front end of the first mounting part 11, the defoaming area 211 is obliquely arranged, and the filter screen 3 and the feeding device 4 are arranged above the defoaming area 211;
the feeding area 212 is positioned at the rear side of the defoaming area 211, is horizontally arranged, and is provided with the filter screen 3 and the feeding device 4 above the feeding area 212;
the dewatering area 213 is positioned at the rear side of the feeding area 212, is horizontally arranged, and is provided with a rolling dewatering device 5 above the dewatering area 213; and
and a water absorbing zone 214, wherein the water absorbing zone 214 is positioned at the rear side of the dewatering zone 213, is horizontally arranged, and is provided with a vacuum vibration water absorbing device 6 below the water absorbing zone 214.
As shown in fig. 3, further, the lower end area of the filter screen 3 sequentially includes, in the conveying direction:
a filtering section 31, which is arranged above the feeding section 212, is arranged in parallel with the feeding section 212, and filters the slurry supplied from the feeding section 212 by the feeding device 4; and
and the humidifying area 32 is arranged above the defoaming area 211, is obliquely arranged, and is overlapped and closely attached to the defoaming area 211.
It should be noted that, at the defoaming area 211, the moisture contained in the filter web 3 on the humidifying area 32 and the filler left in the slurry are coated, and the forming web 2 on the coated defoaming area 211 is squeezed out of the air contained in the mesh by the moisture, and a layer of filler coating is left on the forming web, so that the retention between the forming base paper and the forming web 2 is improved when the subsequent papermaking work is performed.
As a preferred embodiment, as shown in fig. 4, the supply device 4 comprises:
the feeding mechanism 41 is arranged at one side of the frame 1, and a plurality of feeding pipes 412 at the tail end of the feeding mechanism 41 are arranged above the filtering area 31 in a hanging manner and feed the feeding area 212;
a floating mechanism 42, wherein the floating mechanism 42 is disposed between the feeding pipe 412 and the filtering area 31, and floats the slurry fed from the feeding pipe 412; and
and the cleaning mechanism 43 is arranged above the junction of the filtering area 31 and the humidifying area 32, and is used for cleaning the coarse fibers filtered out by the filtering area 31.
As shown in fig. 4, further, the feeding mechanism 41 includes:
the slurry tank 411 is arranged on one side of the rack 1, and the slurry tank 411 is arranged in a square shape;
the feeding pipes 412 are all communicated with the slurry tank 411, are suspended above the filtering area 31 along the conveying direction of the papermaking area 21, are arranged as long-strip direction pipes, and are provided with a plurality of discharging holes 4121 at equal intervals along the length direction of the lower surface of the feeding pipe 412; and
and a feeding pump 413, wherein the feeding pump 413 is arranged on the upper end face of the slurry tank 411 and is used for pumping slurry for the feeding pipe 412.
As shown in fig. 6, further, the floating mechanism 42 includes:
the baffle plates 421 are symmetrically arranged at two longitudinal sides of the filtering area 31, are fixedly connected with the frame 1, and are horizontally provided with sliding grooves 4211 at the front ends, and the sliding grooves 4211 are arranged in a waist shape; and
and the two ends of the smoothing roller 422 are arranged in the chute 4211 in a rolling manner, are positioned above the filtering area 31, and are driven by the conveying of the filter screen 3 to roll back and forth along the chute 4211.
It should be noted that the slurry tank 411 pumps the slurry through the feeding pipe 412 by the feeding pump 413, the pumped slurry enters the filtering area 31, the filtered slurry is extruded to the feeding area 212 by the troweling roller 422, and during the extrusion process of the troweling roller 422, the troweling roller 422 evenly screeds the slurry, so that the slurry can be evenly attached to the feeding area 212.
As shown in fig. 5, it is noted that the diameter of the discharge holes 4121 formed in the feed pipe 412 is smaller and smaller along the conveying direction of the charging section 212, and this arrangement is so that the slurry is deposited on the charging section 212 through the filter screen 3 and a large portion thereof in the early stage, and if the diameter of the discharge holes 4121 is kept uniform, the slurry added in the later stage is likely to cause the slurry added in the early stage to flow out through the forming wire 2, resulting in the waste of the slurry.
It is further explained that the troweling roller 422 is driven by the conveying roller of the filter screen 3 rotating in the rotating and conveying process, and the troweling roller 422 can move back and forth along the chute 4211 by connecting the connecting rods, so that the troweling roller can extrude the slurry.
It is further described that the gears 423 are sleeved at the two ends of the troweling roller 422, and the rack 424 meshed with the gears 423 is arranged at the lower part of the sliding groove 4211, so that the troweling roller 422 slides to roll, the troweling roller can roll slurry, and the troweling effect is better.
As shown in fig. 7 and 8, as a preferred embodiment, the cleaning mechanism 43 includes:
the cleaning roller 431 is provided with two ends rotatably arranged on the first installation part 11, is positioned at the junction of the filtering area 31 and the humidifying area 32, is uniformly distributed with a plurality of brush needles 4311 at equal intervals along the axial direction in the circumferential direction, and is flexibly arranged; and
cleaning groove 432, cleaning groove 432 is rectangular shape top opening setting, its set up in cleaning roller 431's rear side, and its both ends with troweling mechanism 42 can be dismantled and be connected, and this cleaning groove 432 just has seted up a plurality of grooves 4321 of scraping on cleaning roller 431's the lateral wall, should scrape the groove 4321 all with brush needle 4311 alternates the cooperation.
It should be noted that, after the filter screen 3 finishes the filtering operation of the slurry, the fibers filtered out on the filter screen are not cleaned to block the meshes on the filter screen 3, so that the filter screen 3 cannot be used, therefore, the cleaning roller 431 is driven to rotate by the conveying roller rotating on the forming net 2, the brush needles 4311 on the filter screen are used for brushing the filter screen 3, the fibers are brushed by the brush needles 4311, the smoothness of the filter screen 3 is ensured, and meanwhile, along with the interpenetration cooperation of the brush needles 4311 and the scraping grooves 4321 on the cleaning grooves 432, the brushed fibers are stripped and retained in the cleaning grooves 432.
It is further explained that, because the forming net 2 and the filter net 3 rotate oppositely to each other to convey the screen, the cleaning roller 431 and the filter net 3 are also conveyed oppositely to each other, which is beneficial for the brush needles 4311 to brush and take out the fibers.
It is further noted that the cleaning groove 431 is detachably connected, and the collected fibers can be used as fiber materials for manufacturing special paper or other paper.
As shown in fig. 2, as a preferred embodiment, the dehydration device 5 includes:
the two ends of each dewatering roller 51 are rotatably arranged on the first installation part 11, the dewatering rollers are equidistantly arranged above the dewatering area 213 along the conveying direction of the dewatering area 213, and the vertical distance between each dewatering roller 51 and the dewatering area 213 is reduced along the conveying direction of the dewatering area 213; and
and the dewatering motor 52 is arranged on one side of the first installation part 11, is in transmission connection with any dewatering roller 51 and drives other dewatering rollers 51 to rotate in a belt transmission mode.
In the process of squeezing and dewatering the slurry by the dewatering roll 51, the vertical distance between the dewatering roll 51 and the dewatering zone 213 is gradually reduced along with the conveying direction of the dewatering zone 213 because the thickness of the slurry is gradually reduced due to the gradual reduction of the moisture in the slurry, and the moisture in the slurry can be squeezed out as much as possible.
Further, the dewatering rolls 51 are driven by a dewatering motor 52 to rotate in a belt transmission manner.
As shown in fig. 2 and 9, as a preferred embodiment, the vacuum vibration water absorption device 6 includes:
a vacuum suction pump 61, the vacuum suction pump 61 being provided at one side of the first mounting portion 11; and
and the water suction plate 62 is arranged in a vacuum manner inside the water suction plate 62, is arranged below the water suction area 214, is covered by the forming wire 2, is communicated with the vacuum water suction pump 61, and is provided with a plurality of water suction grooves 621 along the conveying direction of the water suction area 214 on the upper end surface of the water suction plate 62.
Wherein, the water absorption grooves 621 are arranged from dense to sparse along the conveying direction of the water absorption area 214.
The vacuum suction pump 61 forms a vacuum region inside the suction plate 62, and the water suction grooves 621 suck water from the slurry on the water suction region 214, thereby forming the slurry into a base paper.
It is further described that the area between the adjacent water absorption grooves 621 is covered, so that only the water absorption grooves 621 have suction force, and the area between the water absorption grooves 621 has no suction force, so that an oscillating motion with a small oscillation amplitude is formed on the water absorption surface of the water absorption plate 62, and the water in the slurry can be discharged more thoroughly through the oscillating motion.
It should be further noted that, during the transportation process of the water absorption region 214, the water in the transportation direction of the water absorption region 214 is less and less, and the weight of the slurry is lighter and lighter, and if a larger suction force is provided like the input end of the water absorption region 214, the uniformity of the slurry is damaged, so that the water absorption grooves 621 are arranged from dense to sparse along the transportation direction of the water absorption region 214, so that the suction force at the front section of the water absorption region 214 is larger, the suction force at the rear section is smaller, the uniformity of the slurry is ensured, and the quality of the formed paper is ensured.
More specifically, when the connection port between the vacuum suction pump 61 and the suction plate 62 is provided, the suction force increases as the distance from the vacuum suction pump 61 increases, and therefore, the suction force direction of the vacuum suction pump 61 is opposite to the conveying direction of the water suction area 214, so that the end of the vacuum suction pump 61 with the strongest suction force is connected to the end of the suction groove 621 with the densest suction force, and then the suction force at the connection position between the vacuum suction pump 61 and the suction groove 621 is gradually reduced.
As shown in fig. 10, a high-quality paper web making system further includes a waste water recovering device 7, the waste water recovering device 7 including:
a wastewater tank 71, wherein the wastewater tank 71 is arranged below the feeding zone 212 and the dehydration zone 213, and the wastewater tank 71 covers the feeding zone 212 and the dehydration zone 213; and
and the wastewater output pipe 72 is arranged on one side of the wastewater tank 71.
It should be noted that, in the paper making process, various waste waters are waste waters containing a large amount of chemical agents and components, and if the waste waters are discharged at will, the waste waters can cause great damage to the environment and even have great influence on the health of workers.
Therefore, the slurry in the charging area 212 and the slurry in the dewatering area 213 are collected by the wastewater tank 71, and the wastewater generated during the forming operation is discharged to a subsequent wastewater treatment device through the wastewater outlet pipe 72 for treatment.
The working process is as follows:
before the forming net 2 is subjected to paper pulp forming, the forming net is wetted by a humidifying area 32 on a filter screen 3, a packing layer is formed on the filter screen 3, then a feeding device 4 feeds a paper making area 21, pulp firstly enters an endless mesh ring formed by the filter screen 3, thick and long fibers contained in the pulp are filtered out by the filter screen 3, then the pulp is extruded into the paper making area 21 of the forming net 2 by a leveling mechanism 42, and the pulp is conveyed by the forming net 2 to be sequentially dewatered by a rolling dewatering device 5 and a vacuum vibration water absorption device 6 and then formed into base paper on the forming net 2.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (7)
1. A high quality paper web papermaking process, comprising:
step one, a feeding process, namely pumping papermaking slurry from a slurry box (411) into a plurality of feeding pipes (412) by a feeding pump (413) in a feeding device (4), and spraying the papermaking slurry on a filtering area (31) of a filter screen (3) by the feeding pipes (412), wherein the filter screen (3) is horizontally arranged on a second installation part (12) of a rack (1) in a surrounding manner, an endless screen ring is formed, and the filter screen ring is uniformly distributed and meshed;
step two, a floating process, wherein the papermaking pulp reaching the filtering area (31) is coated in a rolling manner by a floating roller (422) which rolls back and forth along a chute (4211), wherein the floating roller (422) is driven by a conveying roller which rotates in the rotary conveying process of a filter screen (3), and the floating roller (422) can move back and forth along the chute (4211) which is horizontally arranged at the front end of a material baffle plate (421) through the connection of connecting rods, so that the pulp can be extruded by the floating roller, the material baffle plate (421) is symmetrically arranged at two longitudinal sides of the filtering area (31) and is fixedly connected with the frame (1);
step three, a filtering process, wherein the papermaking pulp smoothed by the smoothing roll (422) passes through a filtering area (31) of a filter screen (3), thick and long fibers contained in the papermaking pulp are filtered out by the filtering area (31), and then the papermaking pulp is spread on a papermaking area (21) on a forming screen (2), wherein the filtering area (31) is arranged above the input end of the papermaking area (21) of the forming screen (2), the forming screen (2) is horizontally arranged on a first installation part (11) of a frame (1) in a surrounding manner and forms an endless screen ring which is uniformly distributed with meshes, the upper area of the endless screen ring forms the papermaking area (21), the conveying direction of the papermaking area (21) is opposite to the conveying direction of the lower end area of the filter screen (3), and the papermaking area (21) sequentially comprises a defoaming area (211), a feeding area (212), a dewatering area (213) and a water absorbing area (214) along the conveying direction, the defoaming area (211) is positioned at the front end of the first installation part (11) and is obliquely arranged, a filter screen (3) and a feeding device (4) are arranged above the defoaming area, the charging area (212) is positioned at the rear side of the defoaming area (211) and is horizontally arranged, a filter screen (3) and a feeding device (4) are arranged above the charging area, the dehydrating area (213) is positioned at the rear side of the charging area (212) and is horizontally arranged, a rolling dehydrating device (5) is arranged above the dehydrating area, a water absorbing area (214) is positioned at the rear side of the dehydrating area (213) and is horizontally arranged, a vacuum vibration water absorbing device (6) is arranged below the dehydrating area, the lower end area of the filter screen (3) sequentially comprises a filtering area (31) and a humidifying area (32) along the conveying direction, the filtering area (31) is arranged above the charging area (212) and is parallel to the charging area (212), and the feeding device (4) filters the slurry supplied by the charging area (212), the humidifying area (32) is arranged above the defoaming area (211), is obliquely arranged, and is overlapped and tightly attached to the defoaming area (211);
step four, a water squeezing procedure, namely, the papermaking pulp spread on the forming net (2) is driven by the forming net (2) to be conveyed to a water squeezing station positioned at the rear side of the filtering area (31), a dewatering motor (52) in the rolling dewatering device (5) drives a dewatering roller (51) to rotate and squeeze the papermaking pulp, and the water in the papermaking pulp is squeezed out;
step five, a water absorption process, namely, the papermaking pulp after completing the water squeezing work is driven by a forming net (2) to be conveyed to a water absorption station positioned at the rear side of a dewatering roller (51), and a vacuum water absorption pump (61) in a vacuum vibration water absorption device (6) drives a water absorption plate (62) to carry out vacuum water absorption on the papermaking pulp, so that the papermaking pulp is formed into base paper;
step six, an output procedure, namely after the papermaking pulp is dehydrated and formed into base paper, the base paper is continuously conveyed to an output station positioned at the rear side of the water absorption station through a forming net (2) for output; and
and step seven, a defoaming procedure, wherein before the papermaking slurry is spread on the forming net (2), the forming net (2) is coated by the moisture contained on the filter screen (3) on the humidifying area (32) and the filler remained in the slurry, the forming net (2) on the defoaming area (211) after coating is squeezed by the moisture to remove the air contained in the meshes, and a layer of filler coating is remained on the forming net, wherein the moisture on the filter screen (3) comes from the moisture contained in the papermaking slurry in the step three.
2. A high quality paper web papermaking process according to claim 1, characterised in that: in the first step, the diameter sizes of the discharge holes (4121) on the plurality of feed pipes (412) are arranged in a descending manner along the conveying direction of the forming net (2).
3. A high quality paper web papermaking process according to claim 1, characterised in that: in the third step, a rotary cleaning roller (431) is arranged at the tail end of the filtering area (31), and a plurality of brush needles (4311) on the cleaning roller (431) clean the filter screen (3) which finishes the filtering work.
4. A high quality paper web papermaking process according to claim 3, characterised in that: in the third step, a cleaning groove (432) is arranged behind the cleaning roller (431), and the coarse fibers on the brush needles (4311) are cleaned through the penetration fit of a plurality of scraping grooves (4321) on the cleaning groove (432) and the brush needles (4311).
5. A high quality paper web papermaking process according to claim 3, characterised in that: in the third step, the driving force of the cleaning roller (431) comes from the driving force for driving the forming wire (2) to rotate.
6. A high quality paper web papermaking process according to claim 1, characterised in that: in the fourth step, the vertical distance from the dewatering roll (51) to the forming net (2) is gradually reduced along the conveying direction of the forming net (2).
7. A high quality paper web papermaking process according to claim 1, characterised in that: in the fifth step, a plurality of water absorption grooves (621) on the water absorption plate (62) are arranged from dense to sparse along the conveying direction of the forming net (2).
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| MX2018004729A (en) | 2015-11-03 | 2018-07-06 | Kimberly Clark Co | Paper tissue with high bulk and low lint. |
| AU2017441040B2 (en) | 2017-11-29 | 2023-12-21 | Kimberly-Clark Worldwide, Inc. | Fibrous sheet with improved properties |
| US11313061B2 (en) | 2018-07-25 | 2022-04-26 | Kimberly-Clark Worldwide, Inc. | Process for making three-dimensional foam-laid nonwovens |
| CN108978044A (en) * | 2018-08-21 | 2018-12-11 | 杭州考拉之屋实业有限公司 | A kind of production equipment and its production technology of blotting paper |
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| FR2067588A5 (en) * | 1969-11-04 | 1971-08-20 | Neyrpic Bmb | Producing non-woven fibrous fabrics by filtering fibre - suspensions |
| FI75200B (en) * | 1986-07-04 | 1988-01-29 | Valmet Oy | FOERFARANDE VID PAPPERSFRAMSTAELLNINGSPROCESS FOER FOERBAETTRING AV EGENSKAPER HOS PAPPERET, SAERSKILT DESS RETENTION. |
| FI106386B (en) * | 1999-05-03 | 2001-01-31 | Valmet Corp | Method and apparatus for recovering fibers from recycled water in a paper mill |
| FI115234B (en) * | 2003-09-24 | 2005-03-31 | Metso Paper Inc | A process for making a laminated paper or board web |
| EP1815062B1 (en) * | 2004-11-23 | 2009-07-29 | AstenJohnson, Inc. | Twin wire gap former paper making machine with a variable wrap impingement shoe |
| CN2763332Y (en) * | 2005-01-11 | 2006-03-08 | 郭竟生 | Filter for pulp recovery |
| FI20075783L (en) * | 2007-11-05 | 2009-05-06 | Metso Paper Inc | Track forming machine |
| JP6217002B2 (en) * | 2013-05-20 | 2017-10-25 | デュプロ精工株式会社 | Paper machine, paper machine and paper making method |
| CN204570372U (en) * | 2015-03-10 | 2015-08-19 | 台州森林造纸有限公司 | Papermaking shaped device |
| CN107142772A (en) * | 2017-06-15 | 2017-09-08 | 安徽金亿禾特种纸有限公司 | A kind of paper making equipment and its paper technology |
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