CN107385988B - Composite paper sheet former and dehydration method thereof - Google Patents
Composite paper sheet former and dehydration method thereof Download PDFInfo
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- CN107385988B CN107385988B CN201710596051.9A CN201710596051A CN107385988B CN 107385988 B CN107385988 B CN 107385988B CN 201710596051 A CN201710596051 A CN 201710596051A CN 107385988 B CN107385988 B CN 107385988B
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/10—Wire-cloths
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
- D21F3/02—Wet presses
- D21F3/10—Suction rolls, e.g. couch rolls
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Abstract
The invention discloses a composite paper forming device and a dehydration method thereof, wherein the forming device comprises a top net forming mechanism and a fourdrinier wire part which are matched, the top net of the top net forming mechanism is arranged above the bottom net of the fourdrinier wire part, and the contact surface of the top net forming mechanism forms a curved wet paper conveying channel; at least one upper forming roller and at least one lower forming roller are respectively arranged on the upper side and the lower side of the wet paper conveying channel, the upper forming rollers and the lower forming rollers are alternately distributed along the conveying direction of the wet paper, and a dewatering area is correspondingly formed at each forming roller. The dewatering method is that after the wet paper enters a wet paper conveying channel formed by a top net and a bottom net, the wet paper is dewatered by each forming roller in sequence, and finally the wet paper is taken out of the wet paper conveying channel by the bottom net; in each dewatering zone, the wet sheet is dewatered by a combination of pressing force and centrifugal force. The invention can greatly improve the dewatering capacity of the original wire part by utilizing the combined action of the extrusion force and the centrifugal force, and meets the requirement of the fourdrinier for improving the speed of the vehicle.
Description
Technical Field
The invention relates to the technical field of pulping and papermaking, in particular to a composite paper sheet former and a dehydration method thereof.
Background
The typical fourdrinier machine net part is generally composed of a breast roll, a forming plate, a chopping board (also called a chopping roller), a low vacuum box, a high vacuum box, a vacuum couch roll, a net driving roll, a guide roll, an annular net, a frame and the like, and is mainly dehydrated by means of gravity and vacuum suction, and the two problems exist in the structural type, firstly, the gravity dehydration and the vacuum suction dehydration have low efficiency, so that the dehydration is slow; second, the energy consumption of vacuum suction dewatering is high, and the abrasion of the net is aggravated.
For a typical fourdrinier wire section, when producing tissue paper, a 10 meter long wire would typically correspond to a locomotive speed of 200 meters/minute or less, producing a high basis weight paper would become 150 meters/minute or less, while when the machine speed reaches 300 meters/minute, a 15 meter or longer wire would be required. Because the paper industry is an industry with significant scale benefits, paper mills need to continuously increase production in order to increase production efficiency, and the most effective way to increase production for the original production equipment is to increase the speed of the paper machine, the wire section of the fourdrinier machine is a key factor restricting the increase in speed of the paper machine.
Since the addition of a top wire to the wire section of a fourdrinier wire machine increases the dewatering capacity of the wire section to some extent, there are also currently dewatering capacities that are increased by adding a top wire former above the wire section of the fourdrinier wire machine.
The structure of the composite former with the top net former is shown in figure 1, the arrow direction in the figure is the conveying direction of the paper sheet, the top net former is arranged in the middle of the net part 8, the front is a chopping board 2 and a low vacuum box 3, the rear is a high vacuum box 9 and a vacuum couch roll 6, the moisture content of the wet paper sheet entering the top net 4 is lower and is usually between 1 and 3 percent, so that the upper and lower sides of the paper sheet are dehydrated when the wet paper sheet passes through the top net, and fiber flocculation is dispersed through the extrusion and the hydraulic action between the two layers of nets, the uniformity of the paper sheet is improved, and the difference of the two sides on the paper sheet structure is reduced. However, in the top wire former of this structure, the contact surface between the top wire 4 and the bottom wire 10 remains horizontal, and although dehydration can be increased to some extent, because the moisture content of the wet paper sheet is relatively low when entering the top wire, excessive dehydration pressure cannot be used to avoid affecting the formation of the paper sheet, so that the increase in the amount of dehydration is limited, and the requirement of the existing fourdrinier for increasing the speed of the vehicle and greatly increasing the dehydration of the wire section cannot be satisfied.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a composite paper sheet former which can greatly improve the dewatering capacity of an original wire part by utilizing the combined action of extrusion force and centrifugal force and meet the requirement of a fourdrinier for improving the speed of a vehicle.
Another object of the present invention is to provide a dewatering method of the above composite sheet former.
The technical scheme of the invention is as follows: a composite paper sheet former comprises a top net forming mechanism and a fourdrinier wire part which are matched, wherein an annular top net is arranged in the top net forming mechanism, an annular bottom net is arranged in the fourdrinier wire part, the top net is arranged above the bottom net, and a curved wet paper sheet conveying channel is formed by the contact surface of the top net and the bottom net; at least one forming roller is respectively arranged on the upper side and the lower side of the wet paper sheet conveying channel, the forming roller above the top net is an upper forming roller, the forming roller below the bottom net is a lower forming roller, the upper forming roller and the lower forming roller are alternately distributed along the conveying direction of the wet paper sheet, and a dewatering area is correspondingly formed at each forming roller. The wet paper sheet is driven by a bottom net to be conveyed, enters a wet paper sheet conveying channel formed between two nets (namely a top net and a bottom net), and is dehydrated under the combined action of the extrusion force and the centrifugal force in each dehydration area, wherein extrusion force exists between the top net and the bottom net, and centrifugal force exists on a forming roller; when the dewatering area is correspondingly provided with a vacuum box or a vacuum suction roller, the wet paper sheet is also subjected to vacuum suction, so that the dewatering capacity of the wet paper sheet is further improved. The wet paper sheet conveying channel is designed to be curved, so that the internal stress of paper is reduced, and the wet paper sheet conveying channel can apply larger dewatering pressure to the wet paper sheet in the dewatering process, and the paper performance is improved.
And a water suction tank is arranged above the lower forming roller and is positioned above the top net corresponding to the lower forming roller.
The water absorption box comprises a wiper blade, a water receiving chamber and a vacuum chamber which are sequentially connected, wherein the bottom surfaces of the wiper blade, the water receiving chamber and the vacuum chamber are continuous planes, the section of the wiper blade is triangular (the inclined surface at the top of the wiper blade plays a role in guiding the scraped water to be discharged into the water receiving chamber to the maximum extent), the tip end of the wiper blade is contacted with the surface of the top surface, the water receiving chamber and the vacuum chamber are both rectangular box-shaped, and the bottom surface of the vacuum chamber is provided with a through hole; the water receiving chamber is externally connected with a water pumping device, and the vacuum chamber is externally connected with a vacuum pumping device. When the wet paper sheet enters a dewatering area above the lower forming roller, the wet paper sheet is dewatered under the action of the extrusion force of the two nets and the centrifugal force of the lower forming roller, most of generated water is scraped from the top net surface by the wiper blade, and then is sent into the water receiving chamber and is pumped by a water pumping device externally connected with the water receiving chamber. Simultaneously, the vacuum chamber is under the effect of evacuating device, and through the through-hole of its bottom surface carries out upward suction dehydration to top web surface residual moisture and wet paper page, and the moisture of getting rid of is discharged from the external catch water of vacuum chamber.
In the top net forming mechanism, a lower forming roller and an upper forming roller are sequentially arranged along the conveying direction of the wet paper sheet, wherein the upper forming roller is a driving roller of the top net forming mechanism, and the upper forming roller presses down the top net and the bottom net to enable the conveying channel of the wet paper sheet to form a curved surface shape.
The depth of the upper forming roller pressed into the bottom net is adjustable and is generally 300-500 mm. The upper forming roller can be adjusted up and down, so that the depth of the top net pressed into the bottom net is adjusted, and the extrusion force of the two nets and the dehydration power on the wet paper sheets are adjusted.
As a preferable scheme, the top net forming mechanism is arranged at the rear part of the net part of the fourdrinier machine, the tail end of the net part is provided with a vacuum couch roll, the vacuum couch roll is positioned below a bottom net at the outlet of the wet paper sheet conveying channel, and the vacuum couch roll is simultaneously used as a vacuum suction roll of the top net forming mechanism; a vacuum box is arranged below the bottom net between the lower forming roller and the upper forming roller. The vacuum suction roller in the top net forming mechanism can be saved in the structure, the equipment structure is simplified, the vacuum couch roller plays a role of the suction roller in the top net, and wet paper sheets continue to move forward along with the bottom net after passing through the vacuum couch roller and enter the next working section without being taken away by the top net to influence normal production. The vacuum box produces suction effect to the bottom surface of the bottom net, and wet paper sheets are subjected to the combined action of the extrusion force of two nets and the centrifugal force of the forming roller and then are subjected to the vacuum suction effect of the vacuum box, so that the dewatering capacity of the wet paper sheets is further improved, and meanwhile, the water on the bottom net is also sucked away.
As another preferable scheme, the top net forming mechanism is arranged in the middle of the net part of the fourdrinier machine, a vacuum suction and moving roller is arranged below a bottom net at the outlet of the wet paper sheet conveying channel, and a vacuum box is arranged below the bottom net between the upper forming roller and the vacuum suction and moving roller. In the structure, the top net forming mechanism needs to be provided with an independent vacuum suction and transfer roller, when the wet paper sheet is sent out of the wet paper sheet conveying channel after dehydration, the wet paper sheet is enabled to continuously move forward along with the bottom net through the suction effect of the vacuum suction and transfer roller, and enter the next working section without being taken away by the top net to influence normal production. The vacuum box produces suction effect to the bottom surface of the bottom net, and wet paper sheets are subjected to the combined action of the extrusion force of two nets and the centrifugal force of the forming roller and then are subjected to the vacuum suction effect of the vacuum box, so that the dewatering capacity of the wet paper sheets is further improved, and meanwhile, the water on the bottom net is also sucked away.
In the top net forming mechanism, an inlet of the wet paper sheet conveying channel is provided with a leading-in roller, an outlet of the wet paper sheet conveying channel is provided with a leading-out roller, a first included angle is formed between a top net and a bottom net at the leading-in roller, a second included angle is formed between the top net and the bottom net at the leading-out roller, and the angle of the first included angle is smaller than that of the second included angle. In actual production, the heights of the leading-in roller and the leading-out roller can be adjusted according to actual process requirements, so that the angles of the first included angle and the second included angle are adjusted.
The length of the contact surface between the top web and the bottom web (i.e., the length from the center line of the lower forming roll to the center line of the vacuum couch roll/vacuum suction roll) is 1/4 to 1/3 of the length of the bottom web (i.e., the length from the center line of the breast roll to the center line of the vacuum couch roll), and is generally 2000 to 3000mm long. The dewatering capacity of the bottom net occupied by the top net is 2-4 times of that of the bottom net with the same length, and the dewatering capacity of the net part can be greatly improved. Under the condition of not changing the length of the net table of the long net paper machine, the requirement of improving the speed of the paper machine by 100 m/min-200 m/min can be met.
The inner side of the top net is also provided with a fog absorbing box, a return roller, a correction roller and a tensioning roller, and the leading-in roller, the upper forming roller, the leading-out roller, the fog absorbing box, the return roller, the correction roller and the tensioning roller are sequentially arranged at the inner side of the annular top net along the circulating rotation direction of the top net; the outer side of the annular top net corresponding to the mist absorbing box is also provided with a high-pressure water spraying pipe.
In the composite paper sheet former, the wire section of the fourdrinier wire machine comprises a breast roll, a chopping board, a low vacuum chamber, a vacuum couch roll, a wire driving roll and a wire guiding roll which are sequentially arranged on the inner side of the bottom wire along the conveying direction of the wet paper sheet. When the top net forming mechanism is arranged at the rear part of the net part of the fourdrinier machine, the top net forming mechanism is positioned between the low vacuum chamber and the vacuum couch roll; when the top net forming mechanism is arranged in the middle of the net part of the fourdrinier machine, a high vacuum chamber is also arranged between the low vacuum chamber and the vacuum couch roll in the net part of the fourdrinier machine, and the top net forming mechanism is arranged between the low vacuum chamber and the high vacuum chamber.
The dehydration method of the composite paper sheet former comprises the following steps: the wet paper sheet is conveyed by a bottom net on the net part of the fourdrinier machine, enters a wet paper sheet conveying channel formed by the top net and the bottom net, sequentially passes through forming rollers to be dehydrated, and finally is taken out of the wet paper sheet conveying channel by the bottom net; in the corresponding dewatering area of each forming roller, extrusion force exists between the top net and the bottom net, meanwhile, centrifugal force exists in the forming rollers, and the wet paper sheet is dewatered under the combined action of the extrusion force and the centrifugal force; wherein, the dryness of the wet paper sheet entering the wet paper sheet conveying channel is 3-8%.
Compared with the prior art, the invention has the following beneficial effects:
the composite paper sheet former and the dewatering method thereof are characterized in that the top net forming mechanism is arranged above the bottom net of the net part of the fourdrinier paper machine, and the lower forming net and the upper forming net which are alternately arranged in the top net forming mechanism are utilized to form a curved wet paper sheet conveying channel between the top net and the bottom net, so that the internal stress of paper is reduced, and the wet paper sheet can be subjected to larger dewatering pressure in the dewatering process, and the paper performance is improved. By utilizing the top net forming mechanism, the dehydration capability of the net part can be greatly improved on the premise of not changing the length of the net part of the long net paper machine, and the requirement of the paper machine on improving the speed of the vehicle can be met.
In the composite paper sheet former and the dehydration method thereof, an independent dehydration area is formed at each forming roller, extrusion force exists between a top net and a bottom net in each dehydration area, meanwhile, centrifugal force exists on the forming rollers, and wet paper sheets are dehydrated under the combined action of the extrusion force and the centrifugal force, so that the dehydration effect can be obviously improved; when the dewatering area is correspondingly provided with a vacuum box or a vacuum suction roller, the wet paper sheet is also subjected to vacuum suction, so that the dewatering capacity of the wet paper sheet is further improved.
In the composite paper sheet former, when the top net forming mechanism is arranged at the rear part of the net part between the long nets, the vacuum couch roll on the net part can be used as the vacuum suction roll of the top net forming mechanism, so that the equipment structure is simplified, and the equipment manufacturing cost is reduced.
Drawings
Fig. 1 is a schematic diagram of a conventional fourdrinier wire section.
Fig. 2 is a schematic structural view of embodiment 1 of the present composite sheet former.
Fig. 3 is a schematic structural view of the top net forming mechanism in fig. 2.
Fig. 4 is a schematic structural view of the suction box in fig. 3.
Fig. 5 is a schematic structural view of embodiment 2 of the present composite sheet former.
Detailed Description
The present invention will be described in further detail with reference to examples, but embodiments of the present invention are not limited thereto.
Example 1
The composite sheet former of this embodiment, as shown in fig. 2, comprises a top net forming mechanism a and a fourdrinier wire section B which are matched, wherein an annular top net 4 is arranged in the top net forming mechanism, an annular bottom net 9 is arranged in the fourdrinier wire section, and the top net forming mechanism is arranged at the rear part of the fourdrinier wire section.
The long wire paper machine net part comprises a breast roll 1, a chopping board 2, a low vacuum chamber 3, a vacuum couch roll 6, a net driving roll 5 and a net guiding roll 7 which are sequentially arranged on the inner side of a bottom wire along the conveying direction of wet paper sheets. In the top net forming mechanism, as shown in fig. 3, along the conveying direction of the wet paper sheet, the inner side of the top net is sequentially provided with a leading-in roller 11, a water absorption box 18, an upper forming roller 12, a leading-out roller 13, a mist absorption box 14, a return roller 15, a correction roller 16 and a tensioning roller 17, the outer side of the top net is provided with a lower forming roller 19, a vacuum box 20 and a high-pressure water spraying pipe 21, the high-pressure water spraying pipe is arranged on the outer side of the annular top net corresponding to the mist absorption box, and the lower forming roller and the vacuum box are both arranged below the bottom net.
The top net is arranged above the bottom net, and the contact surface of the top net and the bottom net forms a curved surface type wet paper sheet conveying channel; the upper and lower sides of the wet paper sheet conveying channel are respectively provided with a forming roller (namely an upper forming roller and a lower forming roller), the forming roller above the top net is an upper forming roller, the forming roller below the bottom net is a lower forming roller, and a dewatering area is correspondingly formed at each forming roller. The lower forming roller and the upper forming roller are sequentially arranged along the conveying direction of the wet paper sheet, wherein the upper forming roller is a driving roller of the top net forming mechanism, and the upper forming roller presses down the top net and the bottom net to enable the conveying channel of the wet paper sheet to form a curved surface shape. The depth of the upper forming roll pressed into the bottom net is adjustable, generally 300-500 mm, and in this embodiment, the depth of the upper forming roll pressed into the bottom net is 400mm. The upper forming roller can be adjusted up and down, so that the depth of the top net pressed into the bottom net is adjusted, and the extrusion force of the two nets and the dehydration power on the wet paper sheets are adjusted. After the wet paper sheet is conveyed by the bottom net and enters a wet paper sheet conveying channel formed between two nets (namely a top net and a bottom net), extrusion force exists between the top net and the bottom net in each dewatering area, meanwhile, centrifugal force exists on a forming roller, and the wet paper sheet is dewatered under the combined action of the extrusion force and the centrifugal force; when the dewatering area is correspondingly provided with a vacuum box or a vacuum suction roller, the wet paper sheet is also subjected to vacuum suction, so that the dewatering capacity of the wet paper sheet is further improved. The wet paper sheet conveying channel is designed to be curved, so that the internal stress of paper is reduced, and the wet paper sheet conveying channel can apply larger dewatering pressure to the wet paper sheet in the dewatering process, and the paper performance is improved.
The upper part of the lower forming roller is provided with a water suction box which is positioned above the top net corresponding to the lower forming roller. As shown in fig. 4, the water absorbing tank includes a wiper blade 18-1, a water receiving chamber 18-2 and a vacuum chamber 18-3 which are sequentially connected, wherein the bottom surfaces of the wiper blade, the water receiving chamber and the vacuum chamber are continuous planes, the cross section of the wiper blade is triangular (the inclined surface at the top of the wiper blade guides the scraped water to be discharged into the water receiving chamber to the maximum), the tip of the wiper blade is contacted with the surface of the top surface, the water receiving chamber and the vacuum chamber are both rectangular box-shaped, and the bottom surface of the vacuum chamber is provided with a through hole; the water receiving chamber is externally connected with a water pumping device, and the vacuum chamber is externally connected with a vacuum pumping device. When the wet paper sheet enters a dewatering area above the lower forming roller, the wet paper sheet is dewatered under the action of the extrusion force of the two nets and the centrifugal force of the lower forming roller, most of generated water is scraped from the top net surface by the wiper blade, and then is sent into the water receiving chamber and is discharged by a water pumping device externally connected with the water receiving chamber. Meanwhile, under the action of the vacuumizing device, the vacuum chamber sucks and dehydrates the water left on the top surface of the net and the wet paper sheet upwards through the through holes on the bottom surface of the vacuum chamber, and the removed water is discharged from a steam-water separator (not shown in the figure) connected with the vacuum chamber.
As shown in fig. 2, the vacuum couch roll is positioned below the bottom wire at the outlet of the wet paper sheet conveying passage, and simultaneously serves as a vacuum suction roll of the top wire forming mechanism; a vacuum box is arranged below the bottom net between the lower forming roller and the upper forming roller. The vacuum suction roller in the top net forming mechanism can be saved in the structure, the equipment structure is simplified, the vacuum couch roller plays a role of the suction roller in the top net, and wet paper sheets continue to move forward along with the bottom net after passing through the vacuum couch roller and enter the next working section without being taken away by the top net to influence normal production. The vacuum box produces suction effect to the bottom surface of the bottom net, and wet paper sheets are subjected to the combined action of the extrusion force of two nets and the centrifugal force of the forming roller and then are subjected to the vacuum suction effect of the vacuum box, so that the dewatering capacity of the wet paper sheets is further improved, and meanwhile, the water on the bottom net is also sucked away.
Typically, the top web occupies 1/4 to 1/3 of the length of the bottom web (i.e., the length from the centerline of the lower forming roll to the centerline of the vacuum couch roll/vacuum suction roll), typically 2000 to 3000mm long. The dewatering capacity of the bottom net occupied by the top net is 2-4 times of that of the bottom net with the same length, and the dewatering capacity of the net part can be greatly improved. Under the condition of not changing the length of the net table of the long net paper machine, the requirement of improving the speed of the paper machine by 100 m/min-200 m/min can be met. In this embodiment, the bottom net has a length of 9000mm, and the top net has a length of 2500 mm. If the existing fourdrinier with the bottom net length of 9000mm is adopted to produce tissue paper, the maximum production speed of the fourdrinier is 180m/min, and after the composite paper sheet former is adopted, the production requirement below 300m/min can be met.
Extrusion dewatering is the most effective and most energy-efficient dewatering mode in the papermaking process, and the dewatering efficiency is far greater than that of gravity dewatering, vacuum dewatering and drying dewatering.
In this embodiment, the top wire is installed at the rear of the wire section of the fourdrinier machine, between the low vacuum box and the vacuum couch roll, and the vacuum couch roll is fully utilized as a vacuum suction roll, saving space.
After the pulp sprayed from the pulp flowing box is pre-dewatered by the breast forming roller, the chopping board and the low vacuum box, the dryness and the strength of the wet paper sheet are improved, and the wet paper sheet can bear the action of larger extrusion force.
After the wet paper sheet enters a nip (namely a wet paper sheet conveying channel) between the top net and the bottom net, the wet paper sheet is firstly subjected to the extrusion action of the two nets at the lower forming roller, the centrifugal force action of the lower forming roller and the vacuum suction action of the vacuum box, the dryness of the wet paper sheet is greatly improved, then, the water suction box above the top net and the vacuum box below the bottom net continuously carry out two-side vacuum suction dehydration on the wet paper sheet, and the dryness of the wet paper sheet is further improved.
Finally, in the area between the upper forming roll and the vacuum couch roll, the wet paper sheet is subjected to the two-wire extrusion action, the centrifugal force action of the upper forming roll and the vacuum suction action of the vacuum couch roll, the dryness of the wet paper sheet is improved again, and the dryness of the wet paper sheet reaches 20% -22% when leaving the vacuum couch roll 6.
The upper forming roller can be adjusted up and down, so that the depth of the upper forming roller and the top net pressed into the bottom net can be adjusted, and the extrusion force of the two nets can be adjusted, thereby controlling the dehydration speed.
In the composite paper sheet former, the dewatering of the wet paper sheets mainly utilizes the extrusion action of two nets and the centrifugal force action of the forming roller in the area of the top net forming mechanism, so that the dewatering speed is high, the abrasion to the nets is small, the energy consumption is low, and the requirements of improving the speed and increasing the yield of the paper machine can be met under the condition that the length of the net pattern is unchanged.
Example 2
The present embodiment is a composite sheet former, which is different from embodiment 1 in that: as shown in fig. 5, the top net forming mechanism a is arranged in the middle of the net part B of the fourdrinier machine, a vacuum suction roller 22 is arranged below the bottom net at the outlet of the wet paper sheet conveying channel, and a vacuum box is arranged below the bottom net between the upper forming roller and the vacuum suction roller. A high vacuum chamber 9 is arranged between the low vacuum chamber and the vacuum couch roll in the wire part of the fourdrinier machine, and the top wire forming mechanism is arranged between the low vacuum chamber and the high vacuum chamber.
In the structure, the top net forming mechanism needs to be provided with an independent vacuum suction and transfer roller, when the wet paper sheet is sent out of the wet paper sheet conveying channel after dehydration, the wet paper sheet is enabled to continuously move forward along with the bottom net through the suction effect of the vacuum suction and transfer roller, and enter the next working section without being taken away by the top net to influence normal production. The vacuum box produces suction effect to the bottom surface of the bottom net, and wet paper sheets are subjected to the combined action of the extrusion force of two nets and the centrifugal force of the forming roller and then are subjected to the vacuum suction effect of the vacuum box, so that the dewatering capacity of the wet paper sheets is further improved, and meanwhile, the water on the bottom net is also sucked away.
As described above, the present invention can be better realized, and the above-described embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention; all equivalent changes and modifications are intended to be covered by the scope of the appended claims.
Claims (6)
1. The composite paper sheet former comprises a top net forming mechanism and a fourdrinier wire part which are matched, and is characterized in that an annular top net is arranged in the top net forming mechanism, an annular bottom net is arranged in the fourdrinier wire part, the top net is arranged above the bottom net, and a curved wet paper sheet conveying channel is formed by the contact surface of the top net and the bottom net; at least one forming roller is respectively arranged on the upper side and the lower side of the wet paper sheet conveying channel, the forming roller positioned above the top net is an upper forming roller, the forming roller positioned below the bottom net is a lower forming roller, the upper forming roller and the lower forming roller are alternately distributed along the conveying direction of the wet paper sheet, and a dewatering area is correspondingly formed at each forming roller; in the top net forming mechanism, a lower forming roller and an upper forming roller are sequentially arranged along the conveying direction of the wet paper sheet, wherein the upper forming roller is a driving roller of the top net forming mechanism, and the upper forming roller presses down the top net and the bottom net to enable the conveying channel of the wet paper sheet to form a curved surface shape;
a water suction tank is arranged above the lower forming roller and is positioned above the top net corresponding to the lower forming roller;
the water suction box comprises a wiper plate, a water receiving chamber and a vacuum chamber which are sequentially connected, wherein the bottom surfaces of the wiper plate, the water receiving chamber and the vacuum chamber are continuous planes, the cross section of the wiper plate is triangular, the tip end of the wiper plate is contacted with the surface of the top surface, the water receiving chamber and the vacuum chamber are both rectangular box bodies, and the bottom surface of the vacuum chamber is provided with a through hole; the water receiving chamber is externally connected with a water pumping device, and the vacuum chamber is externally connected with a vacuum pumping device.
2. A composite sheet former as claimed in claim 1 wherein the upper former is pressed into the base web to a depth of 300 to 500mm.
3. The composite sheet former of claim 1, wherein the top wire forming mechanism is disposed in a middle portion of the wire portion of the fourdrinier machine, a vacuum suction roller is disposed below a bottom wire at an outlet of the wet sheet conveying passage, and a vacuum box is disposed below the bottom wire between the upper forming roller and the vacuum suction roller.
4. The composite sheet former according to claim 1, wherein in the top wire forming mechanism, an inlet of the wet sheet conveying channel is provided with a leading-in roller, an outlet of the wet sheet conveying channel is provided with a leading-out roller, a first included angle is formed between the top wire and the bottom wire at the leading-in roller, a second included angle is formed between the top wire and the bottom wire at the leading-out roller, and the angle of the first included angle is smaller than the angle of the second included angle.
5. The composite sheet former of claim 1 wherein the top web and bottom web have a contact surface length of 1/4 to 1/3 of the length of the bottom web and a contact surface length of 2000 to 3000mm.
6. The dewatering method of a composite sheet former according to any one of claims 1 to 5, wherein the wet sheet is transported by a bottom wire on a wire section of a fourdrinier wire, enters a wet sheet transport path formed by a top wire and a bottom wire, sequentially passes through forming rolls to be dewatered, and finally is carried out of the wet sheet transport path by the bottom wire; in the corresponding dewatering area of each forming roller, extrusion force exists between the top net and the bottom net, meanwhile, centrifugal force exists in the forming rollers, and the wet paper sheet is dewatered under the combined action of the extrusion force and the centrifugal force; wherein, the dryness of the wet paper sheet entering the wet paper sheet conveying channel is 3-8%.
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| CN201710596051.9A CN107385988B (en) | 2017-07-20 | 2017-07-20 | Composite paper sheet former and dehydration method thereof |
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| CN201710596051.9A CN107385988B (en) | 2017-07-20 | 2017-07-20 | Composite paper sheet former and dehydration method thereof |
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| CN110735351A (en) * | 2019-11-21 | 2020-01-31 | 中冶美利云产业投资股份有限公司 | fourdrinier paper-making machine with top-wire former |
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| JPH06212592A (en) * | 1993-01-14 | 1994-08-02 | Mitsubishi Heavy Ind Ltd | Device for forming multilayer paper |
| CN1132290A (en) * | 1994-08-31 | 1996-10-02 | 维美德纸张机械公司 | Twin-wire former, in particular for high-speed paper machines |
| JPH11508334A (en) * | 1996-05-06 | 1999-07-21 | ベロイト・テクノロジーズ・インコーポレイテッド | Liner web forming equipment for corrugated board |
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| CN201390922Y (en) * | 2008-12-17 | 2010-01-27 | 安徽山鹰纸业股份有限公司 | Recycled cardboard paper pulp forming device |
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| CN102704314A (en) * | 2012-06-08 | 2012-10-03 | 方汉佐 | Reverse forming net device of special high-speed reverse-net multi-roller drying papermaking machine |
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