Papermaking felt

Abstract

The utility model discloses a papermaking felt which comprises a plurality of fiber layers, a base net and a first soluble fiber layer, the base net comprises a plurality of layers of base cloth which are sequentially stacked and arranged in an attached mode, the two opposite sides of the base net are each provided with at least one fiber layer in a stacked mode, and the first soluble fiber layer is arranged between the base net and the fiber layers in a clamped mode. Wherein the density of the multiple layers of base cloth is gradually reduced in the direction, away from the paper sheet, of the papermaking felt. By means of the structure, the papermaking felt can give consideration to the on-machine adaptation period and the service life of the felt at the same time, the on-machine speed of the new felt is increased, the adaptation period is short, the felt can still maintain certain air permeability in the later period, and the service life is prolonged.

Description

Technical Field

[0001] The utility model is applied to the technical field of textiles, in particular to a papermaking felt. Background Art

[0002] Papermaking felt is an essential consumable in the press section of a paper machine. Its function is to support the wet paper sheets in the press section to maximize the dehydration, and at the same time it plays the role of modifying the paper surface and transferring the paper sheets.

[0003] Air permeability is a very important parameter of papermaking felts for high-speed paper machines. In actual use, the air permeability of felts is not constant. Generally, the air permeability of new felts, the air permeability of felts in use, and the air permeability of felts that have failed are all different. Under normal circumstances, the air permeability of felts will become worse and worse. Therefore, the conventional design of the ordering air permeability of papermaking felts should be slightly greater than the air permeability of the felts in their original state. However, such a design will cause the air permeability of new felts to be a little too high when they are put on the machine, and the paper sheets cannot reach the dryness during normal papermaking, so the speed can only be appropriately reduced.

[0004] Therefore, there is a contradiction between the adaptation period of a new blanket on the machine and the service life of the blanket in the existing blanket design. Utility Model Content

[0005] The utility model provides a papermaking felt to solve the problem in existing felt designs that there is a contradiction between the adaptation period of a new felt on a machine and the service life of the felt.

[0006] In order to solve the above technical problems, the utility model provides a papermaking felt, comprising: multiple fiber layers, a base net and a first soluble fiber layer, the base net comprising multiple layers of base cloths stacked in sequence and arranged in a close relationship, and at least one fiber layer is stacked on opposite sides of the base net, and the first soluble fiber layer is sandwiched between the base net and the fiber layers; wherein, along the direction of the papermaking felt away from the paper sheet, the density of the multiple layers of base cloths gradually decreases.

[0007] Wherein, along the direction of the papermaking felt away from the paper sheet, the diameter of the base wire of the multi-layer base cloth gradually increases.

[0008] Among them, the multi-layer fiber layer includes a first fiber layer, a second fiber layer and a third fiber layer; the second fiber layer is stacked with the side of the base web close to the paper sheet, the first fiber layer is stacked with the second fiber layer away from the base web; the third fiber layer is stacked with the side of the base web away from the paper sheet.

[0009] Wherein, the first soluble fiber layer is attached to and sandwiched between the base net and the third fiber layer.

[0010] Wherein, the papermaking felt further comprises a second soluble fiber layer; the second soluble fiber layer is attached to and sandwiched between the second fiber layer and the base mesh.

[0011] Wherein, the papermaking felt further includes a third soluble fiber layer; the third soluble fiber layer is attached to and sandwiched between the second fiber layer and the first fiber layer.

[0012] Among them, the base net includes a first base cloth, a second base cloth and a third base cloth which are stacked and attached in sequence, and the first base cloth is arranged close to the first fiber layer; the density of the first base cloth is greater than the density of the second base cloth, and the density of the second base cloth is greater than the density of the third base cloth.

[0013] Among them, the density of the first base cloth is 236 strands / 10 cm, the density of the second base cloth is 188 strands / 10 cm, and the density of the third base cloth is 156 strands / 10 cm.

[0014] Wherein, the fineness range of the fiber layer is 10D-60D.

[0015] Wherein, each layer of base fabric is independent of each other.

[0016] The beneficial effects of the utility model are as follows: Different from the prior art, the papermaking felt of the utility model comprises: multiple fiber layers, a base net and a first soluble fiber layer, the base net comprises multiple base fabrics stacked and fitted in sequence, and at least one fiber layer is stacked on opposite sides of the base net, the first soluble fiber layer is sandwiched between the base net and the fiber layer; wherein, along the direction of the papermaking felt away from the paper sheet, the density of the multiple base fabrics gradually decreases. The first soluble fiber layer can be used to increase the initial density of the papermaking felt when it is just put on the machine, so that the speed of the papermaking felt can be increased to a near normal speed when it is just put on the machine. At the same time, during the papermaking process, the papermaking felt is washed with high-pressure water and sucked by the water suction box to gradually take away the soluble fibers in the first soluble fiber layer with the white water, so that the void ratio of the papermaking felt can still be maintained at a certain level, thereby not affecting the later use effect of the papermaking felt and extending the service life of the papermaking felt. In addition, the adaptation period of the new felt on the machine and the service life of the felt are taken into account at the same time, so that the new felt can be put on the machine quickly and the adaptation period is short. The felt can still maintain a certain air permeability in the later period and extend its service life. In addition, the density of the multi-layer base cloth gradually decreases along the direction in which the papermaking felt is away from the paper sheet, that is, the holes of the multi-layer base cloth become larger and larger along the direction in which the papermaking felt is away from the paper sheet, further improving the efficiency of taking away the soluble fibers with the white water and ensuring the void ratio of the papermaking felt. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of an embodiment of a papermaking felt provided by the utility model;

[0018] Figure 2 It is a structural schematic diagram of another embodiment of the papermaking felt provided by the utility model. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0021] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0022] See also Figure 1 , Figure 1 It is a structural schematic diagram of an embodiment of a papermaking felt provided by the utility model.

[0023] The papermaking felt 100 of this embodiment includes: a multi-layer fiber layer 120, a base mesh 110 and a first soluble fiber layer 130. The papermaking felt 100 is an indispensable consumable in the press section of a paper machine. Its function is to support the wet paper sheet in the press section to maximize the dehydration amount, and at the same time, it plays the role of modifying the paper surface and transferring the paper sheet.

[0024] The base net 110 includes multiple layers of base fabrics 111 which are stacked and fitted in sequence. The base fabric 111 is woven by a heavy-duty ring loom and can be woven with nylon material. It can be composed of monofilaments or strands. The base fabric 111 structure can include but is not limited to 1 / 3 or 1 / 2, etc. 1 / 3 means 1 on top and 3 on bottom, which is a regular cycle of 1 warp yarn pressing 3 weft yarns in structure, and 1 / 2 means 1 on top and 2 on bottom, which is a regular cycle of 1 warp yarn pressing 2 weft yarns in structure. The number of base fabrics 111 in the base net 110 can be 2 layers or 3 layers, etc., which is not limited here.

[0025] At least one fiber layer 120 is stacked on opposite sides of the base net 110. The fiber layer 120 can be made of nylon material, which is generally thick inside and thin outside, and is laid in layers according to the quantitative basis of the blanket, the requirements for the paper surface, and the air permeability.

[0026] In a specific application scenario, one fiber layer 120 may be stacked on opposite sides of the base net 110. In a specific application scenario, one fiber layer 120 may be stacked on one side of the base net 110, and two fiber layers 120 may be stacked on the other side of the base net 110. In a specific application scenario, two fiber layers 120 may be stacked on opposite sides of the base net 110. The specific stacking arrangement of the fiber layer 120 may be set based on actual needs and is not limited here.

[0027] The first soluble fiber layer 130 is sandwiched between the base net 110 and the fiber layer 120; the setting of the first soluble fiber layer 130 can be specifically designed based on the setting of the fiber layer 120. In a specific application scenario, when a fiber layer 120 is stacked on opposite sides of the base net 110, a first soluble fiber layer 130 can be sandwiched between the corresponding fiber layer 120 on at least one side of the base net 110. In a specific application scenario, when multiple fiber layers 120 are stacked on at least one side of the base net 110, in addition to sandwiching a first soluble fiber layer 130 between the base net 110 and the corresponding fiber layer 120, a first soluble fiber layer 130 can also be sandwiched between two adjacent fiber layers 120. The specific setting is based on actual needs.

[0028] In a specific application scenario, 2-3% of soluble fibers of the same fineness may be added to the nylon fibers of the fiber layer 120 to achieve partial solubility of the fiber layer 120 .

[0029] When the papermaking felt 100 is in use, one side thereof is placed in contact with the paper sheet, and the density of the multi-layer base fabric 111 gradually decreases as the papermaking felt 100 moves away from the paper sheet. That is, the holes of the multi-layer base fabric 111 become larger and larger as the papermaking felt 100 moves away from the paper sheet, so that the water filtering channel of the papermaking felt 100 is smooth, and it is convenient for white water to carry away the soluble fibers in the first soluble fiber layer 130. Moreover, this density design makes the density of each layer of base fabric 111 different, so as to ensure that the base wiring in each base fabric 111 has basically no chance of overlapping, improve the wiring uniformity of the entire base network 110, reduce the occurrence of uneven local dehydration of the papermaking felt 100, and improve the dehydration efficiency and dehydration uniformity of the papermaking felt 100.

[0030] In this embodiment, by setting the first soluble fiber layer 130 in the papermaking felt 100, the initial density of the finished papermaking felt 100 when it is just put on the machine can be increased by pressurizing and shaping, so that when the appropriate air permeability required by the papermaking felt 100 when it is just put on the machine is met, the speed of the papermaking felt 100 can be increased to a speed close to the normal speed when it is just put on the machine. Although some impurities in the pulp will gradually block part of the felt gap during the papermaking process, the high-pressure water washing and water suction box suction during the papermaking process will gradually take away the soluble fibers in the first soluble fiber layer 130 with the white water, so that the void ratio of the papermaking felt 100 can still be maintained at a certain level, thereby not affecting the later use effect of the papermaking felt 100, extending the service life of the papermaking felt 100, and thus taking into account both the adaptation period of the new felt on the machine and the service life of the felt. Moreover, the present application makes the density of the multi-layer base cloth 111 gradually decrease along the direction of the papermaking felt 100 away from the paper sheet, that is, the holes of the multi-layer base cloth 111 become larger and larger along the direction of the papermaking felt 100 away from the paper sheet, thereby further improving the efficiency of carrying away the soluble fiber with the white water and ensuring the porosity of the papermaking felt 100.

[0031] Through the above structure, the papermaking felt of this embodiment includes: multiple fiber layers, a base net and a first soluble fiber layer, the base net includes multiple layers of base fabrics stacked and attached in sequence, and at least one fiber layer is stacked on opposite sides of the base net, and the first soluble fiber layer is sandwiched between the base net and the fiber layer; wherein, along the direction of the papermaking felt away from the paper sheet, the density of the multiple layers of base fabrics gradually decreases. wherein. The first soluble fiber layer can be used to increase the initial density of the papermaking felt when it is just put on the machine, so that the speed of the papermaking felt can be increased to a near normal speed when it is just put on the machine, and at the same time, the papermaking felt can be washed with high-pressure water and sucked by the water suction box during the papermaking process to gradually take away the soluble fibers in the first soluble fiber layer with the white water, so that the void ratio of the papermaking felt can still be maintained at a certain level, so as not to affect the later use effect of the papermaking felt, and extend the service life of the papermaking felt, and then take into account the adaptation period of the new felt on the machine and the service life of the felt at the same time, so that the new felt can be put on the machine quickly, the adaptation period is short, and the later felt can still maintain a certain air permeability, and extend the service life. Moreover, the density of the multi-layer base cloth gradually decreases as the papermaking felt moves away from the paper sheets, so that the holes of the multi-layer base cloth become larger and larger as the papermaking felt moves away from the paper sheets, further improving the efficiency of carrying away the soluble fibers with the white water, ensuring the porosity of the papermaking felt, and making it easy for some fine fibers and impurities in the slurry to pass through the felt and be carried away with the white water, thus maintaining the appropriate permeability of the papermaking felt.

[0032] In some embodiments, along the direction of the papermaking felt 100 away from the paper sheet, the diameter of the base wire of the multi-layer base cloth 111 gradually increases, thereby further gradually increasing the holes of the base cloth 111, further improving the efficiency of the soluble fiber being carried away with the white water, and ensuring the porosity of the papermaking felt 100.

[0033] In some embodiments, the fineness of the fiber layer 120 ranges from 10D to 60D, and specifically may include but is not limited to 10D, 15D, 20D, 25D, 30D, 40D, 50D or 60D.

[0034] In some embodiments, the layers of base fabric 111 in the base net 110 are independent of each other, that is, the layers of base fabric 111 are not entangled with each other, thereby further improving the wiring uniformity of the entire base net 110, reducing the occurrence of uneven local dehydration of the papermaking felt 100, and improving the dehydration efficiency and dehydration uniformity of the papermaking felt 100.

[0035] See also Figure 2 , Figure 2 It is a structural schematic diagram of another embodiment of the papermaking felt provided by the utility model.

[0036] The position of the base mesh 210, base cloth density, base wire diameter, fiber layer fineness, etc. of the papermaking felt 200 of this embodiment are the same as those of the previous embodiments, please refer to the above text.

[0037] The multiple fiber layers of the papermaking felt 200 of this embodiment may include a first fiber layer 221, a second fiber layer 222, and a third fiber layer 223; wherein the first fiber layer 221 is the surface fiber of the papermaking felt 200; the second fiber layer 222 is the inner fiber of the papermaking felt 200; and the third fiber layer 223 is the bottom fiber of the papermaking felt 200. When the papermaking felt 200 is operated on the machine, the first fiber layer 221 is used to contact with the paper sheet to realize the corresponding function of the papermaking felt 200.

[0038] The second fiber layer 222 is stacked with the side of the base web 210 close to the paper sheet, the first fiber layer 221 is stacked with the side of the second fiber layer 222 away from the base web 210; and the third fiber layer 223 is stacked with the side of the base web 210 away from the paper sheet.

[0039] In a specific application scenario, when no corresponding soluble fiber layer is interposed between the second fiber layer 222 and the base web 210, the second fiber layer 222 is stacked and fitted with the base web 210. In a specific application scenario, when no corresponding soluble fiber layer is interposed between the first fiber layer 221 and the second fiber layer 222, the first fiber layer 221 and the second fiber layer 222 are stacked and fitted with each other.

[0040] The first fiber layer 221, the second fiber layer 222 and the third fiber layer 223 can be made of nylon material with a fineness range of 10D-60D, generally coarse inside and fine outside, and are laid in layers according to the quantitative of the felt, the requirements for the paper surface, and the air permeability. The first fiber layer 221, the second fiber layer 222 and the third fiber layer 223 are combed into a mesh by a carding machine and then needled by a pre-needling machine to form a woolen net of a certain width, length and quantitative, and finally the fiber layers are combined with the base net 210 through the process of needle-flocking to form the papermaking felt 200.

[0041] In a specific application scenario, oil heat and pressure shaping can also be used to eliminate the internal stress of the fibers, make the papermaking felt 200 relatively compact, make the surface flat, and stabilize the specifications. After shaping, the edges can be trimmed and packaged according to the required width.

[0042] In some embodiments, the first soluble fiber layer 231 is attached and sandwiched between the base mesh 210 and the third fiber layer 223. By setting the first soluble fiber layer 231 between the base mesh 210 and the third fiber layer 223, the initial density of the papermaking felt 200 when it is just put on the machine can be increased by pressurizing and shaping the finished papermaking felt 200, so as to meet the appropriate air permeability required when the papermaking felt 200 is just put on the machine. The solubility of the first soluble fiber layer 231 is used to allow the soluble fibers to be taken away with the white water, so that the void ratio of the papermaking felt 200 can still be maintained at a certain level, thereby not affecting the later use effect of the papermaking felt 200, extending the service life of the papermaking felt 200, and thus taking into account both the adaptation period of the new felt on the machine and the service life of the felt.

[0043] In some embodiments, the papermaking felt 200 further includes a second soluble fiber layer 232; the second soluble fiber layer 232 is attached to and sandwiched between the second fiber layer 222 and the base mesh 210, further taking into account the adaptation period of the new felt on the machine and the service life of the felt.

[0044] In some embodiments, the papermaking felt 200 further includes a third soluble fiber layer 233; the third soluble fiber layer 233 is attached to and sandwiched between the second fiber layer 222 and the first fiber layer 221, further taking into account the adaptation period of the new felt on the machine and the service life of the felt.

[0045] In some embodiments, 2-3% soluble fibers of the same fineness can be added separately to the second fiber layer 222 and the third fiber layer 223 to increase the initial density of the papermaking felt 200 when it is just put on the machine and the porosity of the papermaking felt 200 during use, thereby not affecting the later use effect of the papermaking felt 200 and taking into account the adaptation period of the new felt on the machine and the service life of the felt.

[0046] In some embodiments, the base web 210 includes a first base fabric 211 , a second base fabric 212 , and a third base fabric 213 which are sequentially stacked and closely attached to each other, and the first base fabric 211 is disposed close to the first fiber layer 221 .

[0047] The density of the first base fabric 211 is greater than that of the second base fabric 212 , and the density of the second base fabric 212 is greater than that of the third base fabric 213 .

[0048] That is, along the direction of the papermaking felt 200 away from the paper sheet, the density of the first base fabric 211, the second base fabric 212 and the third base fabric 213 gradually decreases. That is, along the direction of the papermaking felt 200 away from the paper sheet, the holes of the first base fabric 211, the second base fabric 212 and the third base fabric 213 become larger and larger, so that the water filtering channel of the papermaking felt 200 is smooth, and it is convenient for white water to take away the soluble fibers in the first soluble fiber layer 231, the second soluble fiber layer 232 and the third soluble fiber layer 233. And this density design makes the density of the first base fabric 211, the second base fabric 212 and the third base fabric 213 different, so as to ensure that the base wiring between the first base fabric 211, the second base fabric 212 and the third base fabric 213 basically has no chance of overlapping, improve the wiring uniformity of the entire base network 210, reduce the occurrence of uneven local dehydration of the papermaking felt 200, and improve the dehydration efficiency and dehydration uniformity of the papermaking felt 200.

[0049] In some embodiments, the density of the first base fabric 211 is 236 strands / 10 cm, the density of the second base fabric 212 is 188 strands / 10 cm, and the density of the third base fabric 213 is 156 strands / 10 cm.

[0050] Specifically, the density of the first base cloth 211 can be 59 / 4=236 strands / 10cm, that is, 4 strands are passed through each reed of No. 59 reed; the density of the second base cloth 212 can be 47 / 4=188 strands / 10cm, that is, 4 strands are passed through each reed of No. 47 reed; the density of the third base cloth 213 can be 39 / 4=156 strands / 10cm, that is, 4 strands are passed through each reed of No. 39 reed; through the above-mentioned density gradient setting, the water filtration channel of the papermaking felt 200 is smooth, and the use of a soluble fiber layer and pressure shaping during post-treatment is combined to improve the initial performance of the papermaking felt 200 and extend its service life.

[0051] By setting the soluble fiber layer and base fabric density gradually, the initial density of the new felt can be appropriately increased to meet the air permeability requirements of the new felt when it is first put on the machine. The new felt is gradually compacted after operation, and the impurities in the slurry gradually accumulate and block part of the pores of the felt. At the same time, the soluble fiber is gradually taken away with the white water, so that the felt can still maintain appropriate air permeability.

[0052] The above description is only an implementation method of the present utility model, and does not limit the patent scope of the present utility model. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present utility model, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present utility model.

Claims

1. A papermaking felt, characterized in that: The papermaking felt comprises: Multiple fiber layers; A base net, the base net comprising a plurality of base fabrics stacked in sequence and arranged in close contact, and at least one fiber layer is stacked on opposite sides of the base net; a first soluble fiber layer, wherein the first soluble fiber layer is sandwiched between the base net and the fiber layer; Wherein, along the direction of the papermaking felt away from the paper sheet, the density of the multi-layer base cloth gradually decreases.

2. The papermaking felt according to claim 1, characterized in that: Along the direction of the papermaking felt away from the paper sheet, the diameter of the base wire of the multi-layer base fabric gradually increases.

3. The papermaking felt according to claim 1, characterized in that: The multi-layer fiber layer comprises a first fiber layer, a second fiber layer and a third fiber layer; The second fiber layer is stacked on a side of the base web close to the paper sheet, and the first fiber layer is stacked on a side of the second fiber layer away from the base web; The third fiber layer is stacked on the side of the base web away from the paper sheet.

4. The papermaking felt according to claim 3, characterized in that: The first soluble fiber layer is attached to and sandwiched between the base web and the third fiber layer.

5. The papermaking felt according to claim 4, characterized in that: The papermaking felt further comprises a second soluble fiber layer; The second soluble fiber layer is attached to and sandwiched between the second fiber layer and the base web.

6. The papermaking felt according to claim 4 or 5, characterized in that: The papermaking felt further comprises a third soluble fiber layer; The third soluble fiber layer is attached to and sandwiched between the second fiber layer and the first fiber layer.

7. The papermaking felt according to claim 3, characterized in that: The base net includes a first base fabric, a second base fabric and a third base fabric which are sequentially stacked and attached to each other, wherein the first base fabric is arranged close to the first fiber layer; The density of the first base fabric is greater than that of the second base fabric, and the density of the second base fabric is greater than that of the third base fabric.

8. The papermaking felt according to claim 7, characterized in that: The density of the first base fabric is 236 strands / 10 cm, the density of the second base fabric is 188 strands / 10 cm, and the density of the third base fabric is 156 strands / 10 cm.

9. The papermaking felt according to claim 1, characterized in that: The fiber layer has a fineness ranging from 10D to 60D.

10. The papermaking felt according to claim 1, characterized in that: The base fabrics in each layer are independent of each other.

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