High-speed paper machine pressure-resistant blanket and paper machine

Abstract

The utility model relates to the technical field of papermaking industry, in particular to a high-speed papermaking machine pressure-resistant blanket and a papermaking machine, the high-speed papermaking machine pressure-resistant blanket comprises a first base cloth layer, an elastic layer and a second base cloth layer, the elastic layer is arranged between the first base cloth layer and the second base cloth layer, the elastic layer can absorb more water, and the water absorption effect is good. Therefore, the water containing space is increased. Furthermore, the first warp yarn and the second warp yarn extend in the first direction, the first weft yarn and the second weft yarn extend in the second direction, the elastic silk yarn extends in the third direction, and an included angle is formed between any two of the first direction, the second direction and the third direction. Therefore, the first warp yarns, the second warp yarns, the first weft yarns, the second weft yarns and the elastic silk yarns can extend in a crossed manner in the direction with included angles, and the pressure resistance among the first base cloth layer, the elastic layer and the second base cloth layer is further improved.

Description

Technical Field

[0001] This utility model relates to the technical field of the papermaking industry, specifically to a pressure-resistant blanket for a high-speed papermaking machine and a papermaking machine. Background Technology

[0002] The paper industry is accelerating the elimination of outdated production capacity and continuously adjusting its industrial structure. Paper machines are developing towards higher speeds and wider widths. Paper mills are optimizing paper machine pressing methods to increase machine speed, improve the dryness of wet paper sheets after pressing, and reduce energy consumption. However, due to structural and technological limitations, the pressure-resistant blankets used in existing high-speed paper machines cannot meet the requirements of current processes in terms of pressure resistance and water capacity as machine speed and linear pressure increase, significantly impacting paper quality. Therefore, there is an urgent need for a high-speed paper machine pressure-resistant blanket with higher pressure resistance and greater water capacity to meet the needs of existing paper machine equipment. Utility Model Content

[0003] The purpose of this application is to provide a pressure-resistant blanket for a high-speed papermaking machine and a papermaking machine.

[0004] This application provides a pressure-resistant blanket for a high-speed paper machine, comprising a first base fabric layer, an elastic layer, and a second base fabric layer, wherein the first base fabric layer, the elastic layer, and the second base fabric layer are sequentially stacked; the first base fabric layer comprises a first warp yarn and a first weft yarn; the second base fabric layer comprises a second warp yarn and a second weft yarn, wherein the first warp yarn and the second warp yarn extend along a first direction, and the first weft yarn and the second weft yarn extend along a second direction; the elastic layer comprises an elastic base fabric layer and elastic threads, wherein the elastic threads are threaded through the elastic base fabric layer and extend along a third direction; any two of the first direction, the second direction, and the third direction form an included angle.

[0005] In one exemplary embodiment of this application, the elastic thread is embedded in the elastic base fabric layer, and the diameter of the elastic thread is between 0.25 mm and 0.5 mm.

[0006] In one exemplary embodiment of this application, the elastic thread includes a plurality of thread segments, each thread segment extending along the third direction, and the plurality of thread segments being spaced apart along a direction perpendicular to the third direction.

[0007] In an exemplary embodiment of this application, when the elastic layer is in a stretched state, the projections of the elastic layer and the second base fabric layer on the first base fabric layer coincide, and the first base fabric layer and the second base fabric layer are fixedly connected to the elastic layer along the edge of the elastic layer.

[0008] In one exemplary embodiment of this application, the diameter of the first warp yarn is smaller than the diameter of the second warp yarn, and the diameter of the first weft yarn is smaller than the diameter of the second weft yarn.

[0009] In one exemplary embodiment of this application, the diameter of the first warp yarn is between 0.20 mm and 0.25 mm, and the diameter of the first weft yarn is between 0.25 mm and 0.30 mm.

[0010] In one exemplary embodiment of this application, the diameter of the second warp yarn is between 0.4 mm and 0.45 mm, and the diameter of the second weft yarn is between 0.45 mm and 0.5 mm.

[0011] In an exemplary embodiment of this application, the high-speed paper machine pressure-resistant blanket further includes a first fiber layer and a second fiber layer. The first fiber layer is located on the side of the first base fabric layer away from the second base fabric layer. The surface roughness of the first fiber layer near the first base fabric layer is greater than the surface roughness of the first fiber layer away from the first base fabric layer. The second fiber layer is located on the side of the second base fabric layer away from the first fiber layer. The surface roughness of the second fiber layer near the second base fabric layer is greater than the surface roughness of the second fiber layer away from the second base fabric layer.

[0012] In one exemplary embodiment of this application, the fineness of both the first fiber layer and the second fiber layer is between 10D and 60D.

[0013] This application also provides a papermaking machine, including the aforementioned high-speed papermaking machine pressure-resistant blanket.

[0014] This application discloses a high-speed paper machine pressure-resistant blanket and a paper machine, which has the following beneficial effects: It includes a first base fabric layer, an elastic layer, and a second base fabric layer. By setting an elastic layer between the first and second base fabric layers, the elastic layer can absorb more water, thereby increasing the water-holding capacity. Furthermore, the first and second warp yarns extend along a first direction, the first and second weft yarns extend along a second direction, and the elastic yarn extends along a third direction. Any two of the first, second, and third directions have an included angle, thereby enabling the first and second warp yarns, the first and second weft yarns, and the elastic yarn to extend intersectingly in directions with included angles, thus increasing the pressure resistance between the first base fabric layer, the elastic layer, and the second base fabric layer.

[0015] Other features and advantages of this application will become apparent from the following detailed description, or may be learned in part from practice of this application.

[0016] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0018] Figure 1 This is a schematic diagram of the structure of a pressure-resistant blanket for a high-speed paper machine according to an embodiment of this utility model;

[0019] Figure 2 This is a cross-sectional schematic diagram of a high-speed paper machine pressure-resistant blanket in an embodiment of this utility model;

[0020] Figure 3 yes Figure 1 A schematic diagram of a cross-section along a third direction in the elastic layer;

[0021] Figure 4 This is a schematic diagram of the structure of a processing device in an embodiment of this utility model.

[0022] Explanation of reference numerals in the attached figures:

[0023] 10. First base fabric layer; 11. First warp yarn; 12. First weft yarn; 20. Elastic layer; 21. Elastic base fabric layer; 211. Third warp yarn; 212. Third weft yarn; 22. Elastic yarn; 221. Yarn segment; 2211. Loop; 30. Second base fabric layer; 31. Second warp yarn; 32. Second weft yarn; X1. First direction; X2. Second direction; X3. Third direction; 40. First fiber layer; 50. Second fiber layer; 1. High-speed paper machine pressure-resistant blanket; 2. Roller; 3. Tension roll; 4. Pressure roll; 5. Guide roll; 6. Water tank. Detailed Implementation

[0024] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided to make this application more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art.

[0025] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0026] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments. It should be noted that the technical features involved in the various embodiments described below can be combined with each other as long as they do not conflict with each other. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present application, and should not be construed as limiting the present application.

[0027] It should be noted that "multiple" in this article refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0028] Driven by national environmental protection and energy conservation policies, the paper industry is accelerating the elimination of outdated production capacity and continuously adjusting its industrial structure. Paper machines are developing towards higher speeds and wider widths. Paper mills are optimizing paper machine pressing methods to increase machine speed, improve the dryness of wet paper sheets after pressing, and reduce energy consumption. However, due to structural and technological limitations, the pressure-resistant blankets used in existing high-speed paper machines cannot meet the requirements of current processes in terms of pressure resistance and water capacity as machine speed and linear pressure increase, significantly impacting paper quality. Therefore, there is an urgent need for a high-speed paper machine pressure-resistant blanket with higher pressure resistance and greater water capacity to meet the needs of existing paper machine equipment.

[0029] To solve the above technical problems, refer to Figure 1 and Figure 2As shown, this application provides a pressure-resistant blanket for a high-speed paper machine, comprising a first base fabric layer 10, an elastic layer 20, and a second base fabric layer 30, which are stacked sequentially. The first base fabric layer 10 includes a first warp yarn 11 and a first weft yarn 12. The second base fabric layer 30 includes a second warp yarn 31 and a second weft yarn 32. The first warp yarn 11 and the second warp yarn 31 extend along a first direction X1, and the first weft yarn 12 and the second weft yarn 32 extend along a second direction X2. The elastic layer 20 includes an elastic base fabric layer 21 and elastic threads 22, which are threaded through the elastic base fabric layer 21 and extend along a third direction X3. Any two of the first direction X1, the second direction X2, and the third direction X3 have an included angle. Therefore, the system includes a first base fabric layer 10, an elastic layer 20, and a second base fabric layer 30. By providing the elastic layer 20 between the first base fabric layer 10 and the second base fabric layer 30, the elastic layer 20 can absorb more water, thereby increasing the water-holding capacity. Furthermore, the first warp yarn 11 and the second warp yarn 31 extend along a first direction X1, the first weft yarn 12 and the second weft yarn 32 extend along a second direction X2, and the elastic yarn 22 extends along a third direction X3. Any two of the first direction X1, the second direction X2, and the third direction X3 have an included angle, thus enabling the first warp yarn 11 and the second warp yarn 31, the first weft yarn 12 and the second weft yarn 32, and the elastic yarn 22 to extend intersectingly in directions with included angles, thereby increasing the pressure resistance between the first base fabric layer 10, the elastic layer 20, and the second base fabric layer 30.

[0030] In some embodiments, refer to Figure 1 and Figure 2 As shown, the first direction X1 and the second direction X2 are perpendicular, and the angles between the third direction X3 and the first direction X1, and between the third direction X3 and the second direction X2 are both non-perpendicular angles.

[0031] In some embodiments, refer to Figure 1 and Figure 2 As shown, the pressure-resistant blanket of the high-speed paper machine has an elastic layer 20. The elastic layer 20 has good extensibility due to its elasticity. During the forming process of the pressure-resistant blanket of the high-speed paper machine, the elastic layer 20 can be stretched to adapt to the size of the first base fabric layer 10 and the second base fabric layer 30, so that the first base fabric layer 10, the elastic layer 20 and the second base fabric layer 30 can match each other, and thus make the seam stronger when the edge is sewn.

[0032] In some embodiments, refer to Figure 1 and Figure 2As shown, elastic threads 22 are embedded within the elastic base fabric layer 21, and the diameter of the elastic threads is between 0.25 mm and 0.5 mm. After the elastic base fabric layer 21 is formed, the elastic threads 22 are passed through the layers, thereby embedding the elastic threads 22 within the elastic base fabric layer 21. This increases the elasticity and pressure resistance of the elastic layer 20.

[0033] In some embodiments, refer to Figure 1 and Figure 2 As shown, the elastic thread 22 includes multiple thread segments 221, each thread segment 221 extending along a third direction X3, and the multiple thread segments 221 are spaced apart in a direction perpendicular to the third direction X3. Combined with Figure 3 As shown, Figure 3 The diagram shows a structural schematic of the third warp yarn 211 passing through the loop portion 2211. Each yarn segment 221 is a loop yarn segment, and each yarn segment 221 includes two loop portions 2211. The elastic base fabric layer 21 includes the third warp yarn 211 and the third weft yarn 212, with either the third warp yarn 211 or the third weft yarn 212 passing through the loop portion 2211. This design makes the yarn segments 221 more robust. Multiple yarn segments 221 extend along a third direction X3, with intervals between yarn segments 221 in the same direction, thereby reducing the amount of yarn segments 221 used and reducing manufacturing costs while ensuring pressure resistance.

[0034] In some embodiments, refer to Figure 1 and Figure 2 As shown, when the elastic layer 20 is in a stretched state, the projections of the elastic layer 20 and the second base fabric layer 30 on the first base fabric layer 10 coincide. The first base fabric layer 10 and the second base fabric layer 30 are fixedly connected to the elastic layer 20 along the edge of the elastic layer 20. The edges of the first base fabric layer 10, the elastic layer 20, and the second base fabric layer 30 are mainly connected by stitching. When stitching the first base fabric layer 10, the elastic layer 20, and the second base fabric layer 30, the elastic layer 20 needs to be stretched and the edges of the elastic layer 20 aligned with the edges of the first base fabric layer 10 and the second base fabric layer 30 before stitching. This keeps the elastic layer 20 in a taut state, maintaining the structural stability of the pressure-resistant blanket during use in high-speed papermaking machines.

[0035] In some embodiments, the diameter of the first warp 11 is smaller than the diameter of the second warp 31, and the diameter of the first weft 12 is smaller than the diameter of the second weft 32. The density of the first warp 11 and the first weft 12 in the first base fabric layer 10 is greater than the density of the second warp 31 and the second weft 32 in the second base fabric layer 30. Since the pulp first enters the pressure-resistant blanket of the high-speed paper machine from the first base fabric layer 10, the higher density of the first base fabric layer 10 allows it to absorb more water, thus providing a larger water-holding capacity.

[0036] In some embodiments, the diameter of the first warp yarn 11 is between 0.20 mm and 0.25 mm, and the diameter of the first weft yarn 12 is between 0.25 mm and 0.30 mm. The diameter of the second warp yarn 31 is between 0.4 mm and 0.45 mm, and the diameter of the second weft yarn 32 is between 0.45 mm and 0.5 mm. Preferably, the diameter of the first warp yarn 11 is any one of 0.20, 0.21, 0.22, 0.23, 0.24, or 0.25 mm; the diameter of the second warp yarn 31 is any one of 0.41, 0.42, 0.43, 0.44, or 0.45 mm; the diameter of the first weft yarn 12 is any one of 0.25, 0.26, 0.27, 0.28, 0.29, or 0.30 mm; and the diameter of the second weft yarn is any one of 0.45, 0.46, 0.47, 0.48, 0.49, or 0.50 mm. The warp and weft threads of the first base fabric layer 10 and the second base fabric layer 30 are reasonably matched. The first base fabric layer 10 is flat and tight, and the second base fabric layer 30 has good structural strength and water permeability. Its overall structure is tight and stable, with good resilience under pressure, and it is not easy to deform or compact. In addition, its water-holding porosity is stable and it is not easy to harden.

[0037] In some embodiments, the first base fabric layer 10 and the second base fabric layer 30 are both tubular weave base fabrics. The tubular weave base fabric is a one-piece molded annular base fabric without splices, so that the first base fabric layer 10 and the second base fabric layer 30 are seamless, making the pressure-resistant blanket of the high-speed paper machine flatter and reducing the risk of uneven dehydration.

[0038] In some embodiments, refer to Figure 2 As shown, the high-speed paper machine pressure-resistant blanket also includes a first fiber layer 40 and a second fiber layer 50. The first fiber layer 40 is located on the side of the first base fabric layer 10 away from the second base fabric layer 30. The surface roughness of the first fiber layer 40 near the first base fabric layer 10 is greater than the surface roughness of the first fiber layer 40 away from the first base fabric layer 10. The second fiber layer 50 is located on the side of the second base fabric layer 30 away from the first fiber layer 40. The surface roughness of the second fiber layer 50 near the second base fabric layer 30 is greater than the surface roughness of the second fiber layer 50 away from the second base fabric layer 30.

[0039] In some embodiments, during the preparation process of the first fiber layer 40 and the second fiber layer 50, the fiber materials are first carded into a web by a carding machine, and then needle-punched into a wool web by a pre-punching machine. Considering that the surface roughness of the materials of the first fiber layer 40 and the second fiber layer 50 affects the flatness of the surface of the pressure-resistant blanket for high-speed papermaking machines, the finer the material, the flatter the pressure-resistant blanket. Therefore, the surface roughness of the first fiber layer 40 away from the first base fabric layer 10 is made smaller to ensure good water filtration performance of the pressure-resistant blanket for high-speed papermaking machines. The materials of both the first fiber layer 40 and the second fiber layer 50 can be nylon fibers. In other embodiments, materials of appropriate fineness can be selected for the first fiber layer 40 and the second fiber layer 50, taking into account other properties such as air permeability.

[0040] In some embodiments, the fineness of both the first fiber layer 40 and the second fiber layer 50 is between 10D and 60D. The fineness of the first fiber layer 40 and the second fiber layer 50 is the same, and the fineness of both the first fiber layer 40 and the second fiber layer 50 is 10D, 20D, 30D, 40D, 50D or 60D.

[0041] In some embodiments, the first fiber layer 40 and the second fiber layer 50 have different finenesses, wherein the first fiber layer 40 has any fineness of 10D, 20D, 30D, 40D, 50D or 60D, and the second fiber layer 50 has any fineness of 10D, 20D, 30D, 40D, 50D or 60D.

[0042] In some embodiments, refer to Figure 2 As shown, the first base fabric layer 10 has one layer, and the second base fabric layer 30 has multiple layers. In other embodiments, the first base fabric layer 10 can be set to multiple layers and the second base fabric layer 30 can be set to a single layer, taking into account other properties such as air permeability.

[0043] In some embodiments, the first base fabric layer 10 is a single-layer fabric, and the second base fabric layer 30 is a combination of two single-layer fabrics or a double-layer fabric.

[0044] In some embodiments, refer to Figure 4As shown, the pressure-resistant blanket of the high-speed paper machine also requires a post-processing process, which is carried out by a processing device. The processing device includes a roller 2, a tension roller 3, a pressure roller 4, and multiple guide rollers 5. The pressure-resistant blanket 1 of the high-speed paper machine is arranged around the roller 2, the tension roller 3, and the guide rollers 5. The tension roller 3 and the guide rollers 5 are arranged sequentially downstream of the roller 2. There are multiple guide rollers 5. A pressure roller 4 is provided between any two adjacent guide rollers 5. The pressure roller 4 includes a first pressure roller 4 and a second pressure roller 4. The first pressure roller 4 is located on the inner side of the pressure-resistant blanket 1 of the high-speed paper machine, and the second pressure roller 4 is located on the outer side of the pressure-resistant blanket 1 of the high-speed paper machine. The first pressure roller 4 and the second pressure roller 4 respectively abut against the pressure-resistant blanket 1 of the high-speed paper machine. Therefore, roller 2 is a hot oil roller, heated by heat transfer oil to ensure that the surface temperature of roller 2 remains stable within a set range. Downstream of roller 2, tension roller 3 tightens the high-speed paper machine pressure blanket 1, keeping it taut and reducing its inward deformation. Guide roller 5 is located downstream of tension roller 3, guiding the high-speed paper machine pressure blanket 1 into the water tank 6. Pressure roller 4 also squeezes water from the high-speed paper machine pressure blanket 1 into the water tank 6. The hot oil rollers ensure that the pressure-resistant blankets for high-speed paper machines are heated evenly during the post-processing stage, effectively eliminating the internal stress of the pressure-resistant blankets. Furthermore, the steaming and pressurization in the water tank significantly improves the entanglement between the first base fabric layer 10 and the first fiber layer 40, the second base fabric layer 30, and the second fiber layer 50. This results in good dimensional stability of the pressure-resistant blankets during use, reducing the likelihood of shedding. Additionally, the blanket surface is relatively flat, and the blankets exhibit good initial performance on the machine, allowing for earlier formation of the pressure zone for dewatering.

[0045] This application also provides a papermaking machine, including the high-speed papermaking machine pressure-resistant blanket 1 described above.

[0046] In this application, unless otherwise expressly specified and limited, the terms "set up (provided)" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0047] In the description of this specification, references to terms such as "some embodiments" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment is included in at least one embodiment of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of those different embodiments or examples.

[0048] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application. Therefore, any changes or modifications made in accordance with the claims and description of this application should fall within the scope of this patent application.

Claims

1. A press felt for a high speed paper machine, characterized in that The high-speed paper machine pressure-resistant blanket comprises a first base cloth layer, an elastic layer and a second base cloth layer, which are sequentially stacked; the first base cloth layer comprises first warp yarns and first weft yarns; the second base cloth layer comprises second warp yarns and second weft yarns, the first warp yarns and the second warp yarns extend in a first direction, and the first weft yarns and the second weft yarns extend in a second direction; the elastic layer comprises an elastic base cloth layer and elastic filaments, the elastic filaments are arranged in the elastic base cloth layer, and the elastic filaments extend in a third direction; any two of the first direction, the second direction and the third direction have an included angle.

2. The press felt for high speed paper machines according to claim 1, characterized in that The elastic filaments are embedded in the elastic base cloth layer, and the diameter of the elastic filaments is between 0.25 mm and 0.5 mm.

3. The high speed papermaking machine press felt according to claim 1, characterized in that, The elastic filaments comprise a plurality of filament segments, each of the filament segments extends in the third direction, and the plurality of filament segments are arranged in a direction perpendicular to the third direction.

4. The high speed papermaking machine press felt according to claim 1, characterized in that, When the elastic layer is in a stretched state, the projection of the elastic layer and the second base cloth layer on the first base cloth layer is coincident, and the first base cloth layer and the second base cloth layer are fixedly connected with the elastic layer along the edges of the elastic layer.

5. The high speed papermaking machine press felt according to claim 1, characterized in that, The diameter of the first warp yarns is smaller than that of the second warp yarns, and the diameter of the first weft yarns is smaller than that of the second weft yarns.

6. The high speed papermaking machine press felt according to claim 1, characterized in that, The diameter of the first warp yarns is between 0.20 mm and 0.25 mm, and the diameter of the first weft yarns is between 0.25 mm and 0.30 mm.

7. The high speed papermaking machine press felt according to claim 1, characterized in that, The diameter of the second warp yarns is between 0.4 mm and 0.45 mm, and the diameter of the second weft yarns is between 0.45 mm and 0.5 mm.

8. The high speed papermaking machine press felt according to claim 1, characterized in that, The high-speed paper machine pressure-resistant blanket further comprises a first fiber layer and a second fiber layer, the first fiber layer is located on the side of the first base cloth layer away from the second base cloth layer, the surface roughness of the first fiber layer close to the first base cloth layer is greater than the surface roughness of the first fiber layer away from the first base cloth layer, the second fiber layer is located on the side of the second base cloth layer away from the first fiber layer, and the surface roughness of the second fiber layer close to the second base cloth layer is greater than the surface roughness of the second fiber layer away from the second base cloth layer.

9. The press felt for high speed paper machines according to claim 8, characterized in that The fineness of the first fiber layer and the second fiber layer is between 10D and 60D.

10. A paper machine characterized by The high-speed paper machine pressure-resistant blanket comprises the high-speed paper machine pressure-resistant blanket according to any one of claims 1 to 9.

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