CN218345797U - Paper machine - Google Patents

Abstract

The application belongs to the technical field of papermaking, concretely relates to paper machine. The papermaking machine comprises a forming roller, a first fabric layer and a second fabric layer which are driven to rotate around at least part of the outer surface of the forming roller and are overlapped, wherein a feeding channel for receiving paper pulp is formed between the first fabric layer and the second fabric layer before the first fabric layer and the second fabric layer are overlapped on at least part of the outer surface of the forming roller, and the first fabric layer and the second fabric layer can form the paper pulp into paper sheets when moving along with the outer surface of the forming roller; the forming roller group is arranged on the downstream of the forming roller, wherein the first fabric layer and the second fabric layer which are separated from at least part of the outer surface of the forming roller and are overlapped with the paper sheets surround and are pressed on at least part of the outer surface of the roller of the forming roller group, and the first fabric layer and the second fabric layer can dewater the paper sheets when moving along with the rotation of the roller surface in the forming roller group. The dryness of the paper sheet is improved by a mechanical centrifugal dehydration mode through the dehydration roller set, and the purposes of energy conservation and consumption reduction are achieved.

Description

Paper machine

Technical Field

The application belongs to the technical field of papermaking, concretely relates to paper machine.

Background

In the papermaking industry, after the pulp is formed into a sheet, the sheet is typically only about 10% dry, whereas it is desirable to have about 20% dry before it enters the press.

The existing method for improving the dryness of paper sheets generally adopts a vacuum dehydration scheme, and the scheme has the problem of high energy consumption. Specifically, the vacuum environment is built in the scheme of vacuum dehydration, and a pump consumes large electric quantity in the operation process.

SUMMERY OF THE UTILITY MODEL

One object of the present application is to provide a paper machine, which improves the dryness of paper sheets by means of mechanical centrifugal dewatering, so as to achieve the purpose of energy saving and consumption reduction.

According to an embodiment of the application, a first aspect provides a papermaking machine comprising:

a forming roller and a first fabric layer and a second fabric layer which are driven to rotate around at least part of the outer surface of the forming roller and are overlapped, wherein a feeding channel for receiving paper pulp is formed between the first fabric layer and the second fabric layer before the first fabric layer and the second fabric layer are overlapped on at least part of the outer surface of the forming roller, and the first fabric layer and the second fabric layer can form the paper pulp into paper sheets when moving along the outer surface of the forming roller;

the papermaking machine further comprises a dewatering roller set arranged at the downstream of the forming roller, wherein the first fabric layer and the second fabric layer which are separated from at least part of the outer surface of the forming roller and clamp the superposition of the paper sheets surround and are pressed at least part of the outer surface of the roller of the dewatering roller set, and the first fabric layer and the second fabric layer can dewater the paper sheets when moving along with the rotation of the roller surface in the dewatering roller set.

Further, the dewatering roller set comprises a first roller and a second roller, wherein the first roller is positioned at the downstream of the running direction of the forming roller and is positioned at the other side of the forming roller, which is coated with the first fabric layer and the second fabric layer; the second roller is positioned at the downstream of the running direction of the first roller and is positioned at the other side of the first roller coated with the first fabric layer and the second fabric layer; a conveying channel is formed between the first roller and the second roller;

the first fabric layer and the second fabric layer are wound on the surface of the first roller in a stacked mode, and the first fabric layer is located on the outer side of the second fabric layer;

the first fabric layer and the second fabric layer are wound on the surface of the second roller in a stacked mode, and the second fabric layer is located on the outer side of the first fabric layer.

Further, a scraper is arranged at the first roller and/or the second roller;

the scraping head of the scraper positioned at the first roller can be close to the surface of the first fabric layer wound on the surface of the first roller;

the scraping head of the scraper positioned at the second roller can be close to the surface of the second fabric layer wound on the surface of the second roller.

Furthermore, each scraper is correspondingly provided with a water receiving tray, and the water receiving trays are used for receiving the centrifugal action of the first fabric layer and the second fabric layer and the water separated by the scrapers when the scrapers are close to the first fabric layer or the second fabric layer.

Further, a plurality of grooves are formed in the surface of the first roller and/or the surface of the second roller, and communicated holes are formed between the adjacent grooves.

Further, the diameters of the first roller and the second roller are smaller than the diameter of the forming roller.

Further, the paper making machine further comprises a third roller wheel, the third roller wheel is positioned at the downstream of the second roller wheel in the running direction, the surface of the third roller wheel is partially attached to the surface of the second roller wheel, and the second fabric layer is wound on the surface of the third roller wheel;

the first and second superposed fabric layers are squeezed and dehydrated by the second and third rollers when passing between the surfaces of the second and third rollers.

Further, the paper machine also comprises a pressing roller and a pressing part, wherein the pressing roller and the pressing part are positioned at the downstream of the running direction of the dewatering roller set;

the surface of the squeezing roller is attached to the surface of the pressing part, the first fabric layer is wound on the squeezing roller, and the squeezing roller is used for pressing the first fabric layer and the paper sheet to the pressing part.

Further, the paper machine comprises a drying roller, and the surface of the drying roller is the pressing part; and/or the central angle corresponding to the circular arc section formed from the first fabric layer to the pressing roller corresponding to the pressing part from the beginning of the attachment of the first fabric layer to the pressing roller is not more than 45 degrees.

Further, the first fabric layer and the second fabric layer are forming wires or felts; and/or the forming roller is used for driving the first fabric layer and the second fabric layer to move; and/or the first fabric layer and the second fabric layer are arranged in an S shape when being wound around the dewatering roller set in a stacking mode.

In this application, a dewatering roll set is provided downstream of the forming roll for dewatering the sheet between the first fabric layer and the second fabric layer to improve sheet dryness. When the first and second fabric layers pass through the dewatering roller set, the pressure between the dewatering roller set and the first and second fabric layers can squeeze the paper sheet, thereby improving the dryness of the paper sheet. This application realizes mechanical and centrifugal dehydration's mode through the dehydration wheelset and improves the quality of paper, compares the scheme of vacuum dehydration and need not build vacuum environment, consequently more can realize energy saving and consumption reduction's purpose.

Drawings

FIG. 1 is a schematic illustration of a papermaking machine in one embodiment of the present application;

FIG. 2 is a partial schematic view of FIG. 1 at A;

FIG. 3 is a partial schematic view at B of FIG. 2;

FIG. 4 is a schematic representation of a papermaking machine in another embodiment of the present application;

fig. 5 is a partial schematic view at C in fig. 4.

The reference numbers illustrate:

100. a first fabric layer; 110. a feed channel; 200. a second fabric layer;

300. a forming roller; 400. a head box;

500. a dewatering roller set; 510. a first roller; 520. a second roller;

530. a transfer channel; 540. a scraper; 550. a water pan;

600. a third roller; 700. a squeezing roller; 800. and (5) drying the roller.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of and not restrictive on the broad application.

It should be noted that the illustration provided in the present embodiment is only to illustrate the basic idea of the present invention in a schematic way.

The structure, proportion, size and the like shown in the drawings attached to the present specification are only used for matching with the content disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used for limiting the limit conditions that the present invention can be implemented, and any structural modification, proportion relation change or size adjustment should still fall within the scope that the technical content disclosed in the present invention can cover without affecting the efficacy and the achievable purpose of the present invention.

References in this specification to "upper", "lower", "left", "right", "middle", "longitudinal", "lateral", "horizontal", "inner", "outer", "radial", "circumferential", etc., indicate orientations and positional relationships based on those shown in the drawings, and are for convenience only to simplify the description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

As introduced in the background, in the papermaking industry, the dryness of a sheet is typically only about 10% after the pulp is formed into a sheet, whereas it is desirable to have the dryness of a sheet be about 20% before it enters the press. The existing method for improving the dryness of paper sheets generally adopts a vacuum dehydration scheme, and the scheme has the problem of high energy consumption. In particular, the vacuum dewatering scheme involves the construction of a vacuum environment and the pump needs to consume a large amount of electricity during the operation process. In order to better solve the problem, researchers provide a paper machine which aims to improve the dryness of paper by adopting a mechanical and centrifugal force action dehydration mode so as to achieve the purposes of saving energy and reducing consumption.

Fig. 1 is a schematic view of a paper machine according to an embodiment of the present application, and fig. 2 is a partial schematic view at a in fig. 1. The paper machine in this embodiment includes: the paper-making machine comprises a first fabric layer 100, a second fabric layer 200, a forming roller 300 and a dewatering roller set 500, wherein the forming roller 300 can form paper pulp between the first fabric layer 100 and the second fabric layer 200 into paper sheets, the paper pulp can be provided through a head box 400, and water in the paper sheets can be squeezed under the pressure effect between the dewatering roller set 500 and the first fabric layer 100 and the second fabric layer 200; meanwhile, when the stacked first fabric layer 100 and second fabric layer 200 move on the surface of the rolls in the dewatering roll set 500, centrifugal force can be generated and applied to the sheet between the first fabric layer 100 and second fabric layer 200, thereby improving the dryness of the sheet.

This application improves the dryness fraction of paper through machinery and centrifugal dehydration's scheme, compares vacuum dehydration's scheme, and the vacuum environment need not be built to the scheme of this application, consequently more can reach energy saving and consumption reduction's effect.

Specifically, the papermaking machine comprises a forming roller 300 and a first fabric layer 100 and a second fabric layer 200 which are driven to rotate around at least part of the outer surface of the forming roller 300 and are overlapped, wherein a feeding channel 110 for receiving pulp is formed between the first fabric layer 100 and the second fabric layer 200 before the first fabric layer 100 and the second fabric layer 200 are overlapped on at least part of the outer surface of the forming roller 300, and the first fabric layer 100 and the second fabric layer 200 can form the pulp into paper sheets when moving along with the outer surface of the forming roller 300.

The papermaking machine further comprises a dewatering roll set 500 disposed downstream of the forming roll 300, wherein the first and second superposed web layers 100 and 200 sandwiching the sheet, which are separated from at least part of the outer surface of the forming roll 300, surround and press at least part of the outer surface of the rolls of the dewatering roll set 500, and the first and second web layers 100 and 200 can dewater the sheet while moving following the rotation of the roll surfaces of the rolls in the dewatering roll set 500.

It should be noted that the first fabric layer 100 and the second fabric layer 200 are driven to convey pulp or paper, the first fabric layer 100 and the second fabric layer 200 can carry pulp or paper, and the first fabric layer 100 and the second fabric layer 200 can be formed as a forming wire or a felt. A plurality of rollers may be provided in the paper machine, and the first fabric layer 100 and the second fabric layer 200 may be wound around the surfaces of the rollers, respectively or stacked, and driven by the rollers. The conveying direction of the first fabric layer 100 may refer to a direction pointed by an arrow a in fig. 1, and the conveying direction of the second fabric layer 200 may refer to a direction pointed by an arrow b in fig. 1. When the first fabric layer 100 and the second fabric layer 200 are wound in a stacked manner around the forming roll 300 or the dewatering roll set 500, "stacked" can be understood as a state in which the first fabric layer 100 and the second fabric layer 200 are at least partially attached. The first fabric layer 100 and the second fabric layer 200 should both be in tension and in tension when the first fabric layer 100 and the second fabric layer 200 are used in a process for conveying paper or pulp.

The forming roller 300 can be configured with a driving force, and during the rotation of the forming roller 300, the friction force between the forming roller 300 and the first fabric layer 100 drives the first fabric layer 100 to move, and the friction force between the first fabric layer 100 and the second fabric layer 200 drives the second fabric layer 200 to move. It should be noted that the first fabric layer 100 and the second fabric layer 200 can also be driven by other rollers in the papermaking machine.

A headbox 400 may be disposed upstream of the forming roll 300, the headbox 400 being configured to provide a slurry to the feed channel 110 formed between the first and second fabric layers 100, 200. The headbox 400 has pulp stored therein, which may flow through an outlet of the headbox 400 into the feed channel 110. The paper pulp can be a paper making raw material made of plant fibers, and can be formed into a paper sheet shape after being extruded under certain pressure.

Since the first fabric layer 100 and the second fabric layer 200 are overlapped and wound around the forming roller 300, after the pulp enters between the first fabric layer 100 and the second fabric layer 200, the pressure between the second fabric layer 200 and the forming roller 300 can enable the second fabric layer 200 to press the pulp between the first fabric layer 100 and the second fabric layer 200 into paper sheets, and the paper sheets have higher water content and lower dryness.

When the first fabric layer 100 and the second fabric layer 200 are wound on the dewatering roller set 500 in an overlapping manner, the first fabric layer 100 and the second fabric layer 200 are both in a stretched state, and at the moment, the first fabric layer 100 and the second fabric layer 200 which are overlapped exert a force which is pressed against the dewatering roller set 500; meanwhile, when the paper sheets between the first and second fabric layers 100 and 200 are moved along the surfaces of the rollers in the dewatering roller set 500, centrifugal forces are generated between the first and second fabric layers and the dewatering roller set 500, and the paper sheets can be squeezed and dewatered by the centrifugal forces, so that the dryness of the paper sheets is improved. The direction of conveyance of the first fabric layer 100 and the second fabric layer 200 into the dewatering roll set 500 can be seen in the direction indicated by the arrow c in fig. 2.

For example, when the first fabric layer 100 is attached to the dewatering roller set 500, the second fabric layer 200 is located outside the first fabric layer 100, the paper is located between the first fabric layer 100 and the second fabric layer 200, and the force applied to the dewatering roller set 500 by the second fabric layer 200 can press the paper against the first fabric layer 100 and then act on the dewatering roller set 500; meanwhile, the centrifugal force generated when the paper sheet rotates along with the roller in the dewatering roller set 500 and the centrifugal force generated when the second fabric layer 200 rotates along with the roller in the dewatering roller set 500 can also apply the acting force and the paper sheet, thereby improving the paper sheet dewatering effect.

In this embodiment, the pulp can be conveyed to the feeding channel 110 formed by the first fabric layer 100 and the second fabric layer 200 at the forming roller 300 through the head box 400, and when the forming roller 300 conveys the first fabric layer 100 and the second fabric layer 200, because the first fabric layer 100 and the second fabric layer 200 are respectively wound on the forming roller 300 and the second fabric layer 200 is positioned at the outer side of the first fabric layer 100, the pressure between the second fabric layer 200 and the forming roller 300 can press and form the pulp into paper sheets; after the first fabric layer 100 and the second fabric layer 200 enter the dewatering roll set 500, the pressure between the dewatering roll set 500 and the first fabric layer 100 or the second fabric layer 200 can squeeze the moisture of the paper sheet between the first fabric layer 100 and the second fabric layer 200, so as to improve the dryness of the paper sheet.

It should be noted that the squeezing and dewatering time between the forming roller 300 and the first fabric layer 100 and the second fabric layer 200 can be realized by changing the wrap angle of the first fabric layer 100 and the second fabric layer 200 on the forming roller 300, and similarly, the squeezing and dewatering time between the dewatering roller set 500 and the first fabric layer 100 and the second fabric layer 200 can also be realized by changing the wrap angle.

In this embodiment, a vacuum environment is not required to be built, but the paper sheet is dewatered by the action force generated by the dewatering roller set 500 when the first fabric layer 100 and the second fabric layer 200 are conveyed, so that the dryness of the paper sheet is improved by the mechanical and centrifugal dewatering manner, and the energy consumption can be reduced as soon as possible.

In one embodiment, referring to fig. 1 and 2, the dewatering roll set 500 comprises a first roll 510 and a second roll 520, wherein the first roll 510 is located downstream of the forming roll 300 in the running direction and is located on the other side of the forming roll 300 covered with the first fabric layer 100 and the second fabric layer 200; the second roller 520 is positioned downstream of the first roller 510 in the running direction and is positioned at the other side of the first roller 510 coated with the first fabric layer 100 and the second fabric layer 200; the first roller 510 and the second roller 520 form a transfer passage 530 therebetween. The first fabric layer 100 and the second fabric layer 200 may be arranged in an "S" shape when they are wound on the dewatering roll set 500 in an overlapping manner, and it is understood that the first fabric layer 100 and the second fabric layer 200 are sequentially wound on the first roll 510 and the second roll 520, and the arrangement positions of the first fabric layer 100 and the second fabric layer 200 may be understood as having an "S" shape. Therefore, the first fabric layer 100 and the second fabric layer 200 have larger wrap angles when being arranged on the dewatering roller set 500, and the dryness of paper sheets can be improved better.

Specifically, the first fabric layer 100 and the second fabric layer 200 are wound on the surface of the first roller 510 in an overlapping manner, and the first fabric layer 100 is located outside the second fabric layer 200; the first fabric layer 100 and the second fabric layer 200 are wound around the surface of the second roller 520 in an overlapping manner, and the second fabric layer 200 is located outside the first fabric layer 100.

In this embodiment, when the first fabric layer 100 and the second fabric layer 200 are conveyed by the first roller 510 and the second roller 520, the first fabric layer 100 presses the paper sheet against the first roller 510 and the second fabric layer 200 presses the paper sheet against the second roller 520 to remove the moisture from the paper sheet, thereby improving the dryness of the paper sheet.

When the first roller 510 and the second roller 520 are arranged in a staggered manner, the purpose is to enable the first fabric layer 100 and the second fabric layer 200 to have larger wrap angles in the first roller 510 and the second roller 520, that is, the first fabric layer 100 and the second fabric layer 200 have larger wrap areas in the first roller 510 and the second roller 520, so that the time for pressing the paper by the first fabric layer 100 or the second fabric layer 200 and the time for receiving centrifugal force can be longer, and the dryness of the paper can be improved more remarkably.

It should be noted that, because the first fabric layer 100 is tightly attached to the forming roller 300, when the first fabric layer 100 is conveyed from the forming roller 300 to the first roller 510, if the first fabric layer 100 is still tightly attached to the first roller 510, the wrap angle of the first fabric layer 100 on the forming roller 300 and the first roller 510 is small or the first fabric layer 100 is hard to be tightly attached to the forming roller 300 and the first roller 510, which is hard to achieve the actual production requirement. For example, in the actual arrangement, the wrap angles of the first fabric layer 100 and the second fabric layer 200 with respect to the roll surfaces of the dewatering roll train 500 can be controlled within a range of not less than 150 °.

To this end, at the forming roller 300, the first fabric layer 100 is positioned against the surface of the forming roller 300, and the second fabric layer 200 is positioned outside the first fabric layer 100, while at the first roller 510, the second fabric layer 200 is positioned against the surface of the first roller 510, and the first fabric layer 100 is positioned outside the second fabric layer 200; similarly, when the second roller 520 is used, the first fabric layer 100 is attached to the surface of the second roller 520, and the second fabric layer 200 is located outside the first fabric layer 100, so that the dryness of the paper industry between the first fabric layer 100 and the second fabric layer 200 can be further improved.

In addition, a plurality of dewatering roller sets 500 may be provided according to the dryness requirement of the paper sheet, or a plurality of first rollers 510 and second rollers 520 may be further included in the dewatering roller set 500. The distance between the first roller 510 and the forming roller 300, and the distance between the second roller 520 and the first roller 510 may be set according to the actual arrangement.

Further, referring to fig. 2 and 3, in an embodiment, a scraper 540 is disposed at the first roller 510 and/or the second roller 520, that is, the scraper 540 is disposed at least one of the first roller 510 and the second roller 520. The scraping head of the scraper 540 at the first roller 510 can approach the surface of the first fabric layer 100 wound on the surface of the first roller 510; the scraping head of the scraper 540 at the second roller 520 can be close to the surface of the second fabric layer 200 wound on the surface of the second roller 520.

It should be noted that the scraper 540 includes a driving element capable of driving the scraping head of the scraper 540 to move, and taking the scraper 540 at the second roller 520 as an example, in the process that the scraper 540 at the second roller 520 can drive the scraping head to approach the second fabric layer 200, a "coanda effect" can be generated between the scraping head of the scraper 540 and the moving second fabric layer 200, so that moisture in the second fabric layer 200 flows out along the surface of the scraping head, and an auxiliary dewatering effect is achieved. The blade 540 may be selected, for example, from the DST blade which uses pneumatic pressure and pressure relief, and the pressure provided by the DST blade head onto the roll is relatively constant to better remove debris from the first and second fabric layers 100 and 200. The doctor blade 540 provided at the first roller 510 is similar in principle to the doctor blade 540 provided at the second roller 520.

In addition, a water receiving tray 550 may be correspondingly disposed at each scraper 540, as shown in fig. 2, wherein the water receiving tray 550 is used for receiving the water separated by the centrifugal action of the first fabric layer 100 and the approach of the scraper 540 to the first fabric layer 100 or the second fabric layer 200. It should be noted that the water receiving tray 550 is located at the lower side of the scraper 540, so that the water separated by the action of the scraper 540 can flow into the water receiving tray 550 well.

In some embodiments, the surface of the first roller 510 and/or the surface of the second roller 520 are provided with a plurality of grooves, and adjacent grooves are provided with communicating apertures therebetween. By way of example of the grooves formed in the first roller 510, when the first roller 510 rotates, the airflow in the external environment can enter the first fabric layer 100 and the second fabric layer 200 wound on the surface of the first roller 510 along with the grooves and the gaps between the grooves, and the paper between the first fabric layer 100 and the second fabric layer 200 correspondingly fills the gaps left by the dewatering of the paper, so that the dewatering effect can be improved by the design scheme.

In some embodiments, the diameter of the first roller 510 and/or the second roller 520 is less than the diameter of the forming roller 300. It should be noted that, the speed of the first fabric layer 100 and the second fabric layer 200 is the same during the conveying process, and in this embodiment, after the diameter of the first roller 510 and/or the second roller 520 is smaller than the diameter of the forming roller 300, the pressure of the first fabric layer 100 and the second fabric layer 200 on the surfaces of the first roller 510 and the second roller 520 can be increased, so that the pressing force applied to the paper sheet between the first fabric layer 100 and the second fabric layer 200 is larger, that is, the dryness of the paper sheet can be better improved.

In some embodiments, referring to fig. 1, the papermaking machine further comprises a third roller 600, wherein the third roller 600 is positioned downstream in the direction of travel of the second roller 520; the surface of the third roller 600 is partially attached to the surface of the second roller 520, and the second fabric layer 200 is wound on the surface of the third roller 600; the overlapped first fabric layer 100 and second fabric layer 200 are dehydrated by the second roller 520 and third roller 600 while passing between the surface of the second roller 520 and the surface of the third roller 600.

In this embodiment, by providing the third roller 600, the paper sheet between the first fabric layer 100 and the second fabric layer 200 can be pressed when the first fabric layer 100 and the second fabric layer 200 pass through the second roller 520 and the third roller 600, and thus the dryness of the paper sheet between the first fabric layer 100 and the second fabric layer 200 can also be improved.

In addition, the second fabric layer 200 is disposed on the third roller 600, and functions such that when the paper sheet is pressed by the dewatering roller set 500 and the third roller 600, the dryness of the paper sheet can meet the pressing requirement. The paper sheet can be conveyed by the first fabric layer 100 during the pressing process, and therefore, the second fabric layer 200 is arranged on the third roller 600, so that the first fabric layer 100 can be separated from the second fabric layer 200, and the subsequent pressing treatment of the paper sheet can be satisfied.

In some embodiments, referring to fig. 1 and 4, the paper making machine further includes a press roller 700 and a pressing portion, the press roller 700 and the pressing portion are located downstream of the dewatering roller set 500, the surface of the press roller 700 is attached to the surface of the pressing portion, the first fabric layer 100 is wound around the press roller 700, and the press roller 700 is used for pressing the first fabric layer 100 and the paper sheet to the pressing portion. The dryness of the paper sheet can be further improved when the surface of the press roller 700 is bonded to the surface of the pressing portion.

Drying rolls 800 may be included in the papermaking machine, and as shown in fig. 1 and 4, the surfaces of the drying rolls 800 have a high temperature to dry the paper sheet. The surface of the drying roller 800 may serve as a pressing portion.

Further, referring to fig. 5, the central angle corresponding to the arc segment formed from the first fabric layer 100 attaching to the press roller 700 to the pressing portion corresponding to the press roller 700 is not greater than 45 °, referring to the angle α notation in fig. 5, on one hand, the area of the first fabric layer 100 covering the press roller 700 can be reduced, thereby shortening the length of the first fabric layer 100; on the other hand, the small area of the first fabric layer 100 covered on the press roll 700 can reduce the moisture of the first fabric layer 100 from wetting back into the paper sheet conveyed by the first fabric layer 100, thereby affecting the dryness of the paper sheet. For example, if the central angle is too large, the contact area of the first fabric layer 100 with the surface of the press roll 700 is large, and moisture rewetting from the first fabric layer 100 will diffuse into the paper sheet on the surface of the first fabric layer 100 under the influence of centrifugal force and for a longer period of time, thereby affecting the dryness of the paper sheet.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above examples only express several embodiments of the present application, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent application shall be subject to the appended claims.

Claims (10)

1. A paper making machine comprising a forming roll (300) and a first fabric layer (100) and a second fabric layer (200) driven to rotate around at least part of the outer surface of the forming roll (300) and to be superposed, wherein a feed channel (110) for receiving a pulp is formed between the first fabric layer (100) and the second fabric layer (200) before superposition on at least part of the outer surface of the forming roll (300), the first fabric layer (100) and the second fabric layer (200) being capable of forming the pulp into a sheet as they move following the outer surface of the forming roll (300), characterized in that:

the papermaking machine further comprises a dewatering roll set (500) arranged downstream of the forming roll (300), wherein the first fabric layer (100) and the second fabric layer (200) which are overlapped and clamp the paper sheet and leave at least part of the outer surface of the forming roll (300) surround and are pressed on at least part of the outer surface of the roll of the dewatering roll set (500), and the first fabric layer (100) and the second fabric layer (200) can dewater the paper sheet when moving along with the rotation of the roll surface in the dewatering roll set (500).

2. The papermaking machine according to claim 1, characterized in that: the dewatering roller set (500) comprises a first roller (510) and a second roller (520), the first roller (510) is positioned at the downstream of the running direction of the forming roller (300), and is positioned at the other side of the forming roller (300) coated with the first fabric layer (100) and the second fabric layer (200); the second roller (520) is positioned at the downstream of the running direction of the first roller (510), and is positioned at the other side of the first roller (510) coated with the first fabric layer (100) and the second fabric layer (200); a conveying channel (530) is formed between the first roller (510) and the second roller (520);

the first fabric layer (100) and the second fabric layer (200) are wound on the surface of the first roller (510) in an overlapping manner, and the first fabric layer (100) is positioned on the outer side of the second fabric layer (200);

the first fabric layer (100) and the second fabric layer (200) are wound on the surface of the second roller (520) in an overlapping manner, and the second fabric layer (200) is positioned outside the first fabric layer (100).

3. The papermaking machine according to claim 2, characterized in that: a scraper (540) is arranged at the first roller (510) and/or the second roller (520);

the scraping head of the scraper (540) at the first roller (510) can be close to the surface of the first fabric layer (100) wound on the surface of the first roller (510);

the scraping head of the scraper (540) positioned at the second roller (520) can be close to the surface of the second fabric layer (200) wound on the surface of the second roller (520).

4. A paper machine according to claim 3, characterized in that: a water receiving tray (550) is correspondingly arranged at each scraper (540), the water receiving tray (550) is used for receiving water separated by the centrifugal action of the first fabric layer (100) and the second fabric layer (200) and the contact of the scraper (540) to the first fabric layer (100) or the second fabric layer (200).

5. The papermaking machine according to claim 2, characterized in that: the surface of the first roller (510) and/or the surface of the second roller (520) are/is provided with a plurality of grooves, and communicated pores are arranged between the adjacent grooves.

6. The papermaking machine according to claim 2, characterized in that: the diameters of the first roller (510) and the second roller (520) are both smaller than the diameter of the forming roller (300).

7. The papermaking machine according to claim 2, characterized in that: the paper machine further comprises a third roller (600), the third roller (600) is positioned at the downstream of the running direction of the second roller (520), the surface of the third roller (600) is partially attached to the surface of the second roller (520), and the second fabric layer (200) is wound on the surface of the third roller (600);

the first fabric layer (100) and the second fabric layer (200) which are stacked are squeezed and dehydrated by the second roller (520) and the third roller (600) when passing between the surface of the second roller (520) and the surface of the third roller (600).

8. The papermaking machine according to claim 2, characterized in that: the paper machine further comprises a press roller (700) and a press part, wherein the press roller (700) and the press part are positioned at the downstream of the running direction of the dewatering roller set (500);

the surface of the pressing roller (700) is attached to the surface of the pressing part, the first fabric layer (100) is wound on the pressing roller (700), and the pressing roller (700) is used for pressing the first fabric layer (100) and the paper sheet to the pressing part.

9. The papermaking machine according to claim 8, characterized in that: the paper making machine comprises a drying roller (800), wherein the surface of the drying roller (800) is the pressing part; and/or the central angle corresponding to the circular arc segment formed from the first fabric layer (100) to the pressing roller (700) corresponding to the pressing part from the beginning of fitting to the pressing roller (700) is not more than 45 degrees.

10. The papermaking machine according to claim 1, characterized in that: the first fabric layer (100) and the second fabric layer (200) are forming wires or felts; and/or the forming roller is used for driving the first fabric layer (100) and the second fabric layer (200) to move; and/or the first fabric layer (100) and the second fabric layer (200) are arranged in an S shape when being arranged around the dewatering roller group (500) in an overlapping way.

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