Papermaking forming net and papermaking equipment

Abstract

The utility model discloses a papermaking forming net and papermaking equipment, the papermaking forming net comprises a surface layer, a connecting layer and a bottom layer, and the connecting layer is used for connecting the surface layer and the bottom layer; the surface layer is formed by weaving surface layer warps and surface layer wefts in a staggered manner, and the number of warps which are interwoven and separated from the surface layer warps by any one of the surface layer wefts is 4; the bottom layer is formed by weaving bottom layer warps and bottom layer wefts in a staggered mode, and the number of the warps which are interwoven between any bottom layer weft and the bottom layer warps is 8. According to the papermaking forming net, the number of interweaving points is larger, the free space in the papermaking forming net is large, and dehydration is faster; in addition, the number of interweaving points of the surface layer warps and the surface layer wefts of the surface layer is not too large, the surface of the papermaking forming net is relatively smoother, and finished paper is smoother and finer; the span of the bottom weft is large, so that the wear resistance of the papermaking forming net is improved, and the service life of the papermaking forming net is prolonged.

Description

Technical Field

[0001] This application belongs to the field of papermaking technology, specifically relating to paper forming wire and papermaking equipment. Background Technology

[0002] The forming wire is a crucial forming and dewatering structure in the wet end of papermaking equipment. Through long-term research, the inventors of this application have discovered that the reuse of waste paper leads to increasingly poor pulp quality, placing higher demands on the dewatering capacity of the forming wire. Current paper forming wires, due to structural limitations, suffer from slow dewatering speeds and insufficient dewatering capacity, resulting in poor paper quality. Utility Model Content

[0003] This application provides paper forming wire and papermaking equipment to solve the technical problem of slow dewatering speed of traditional paper forming wire.

[0004] To solve the above-mentioned technical problems, one technical solution adopted in this application is: a paper forming wire, comprising a surface layer, a connecting layer, and a bottom layer, wherein the connecting layer is used to connect the surface layer and the bottom layer; the surface layer is formed by interlacing surface layer warp and surface layer weft, wherein the number of warp threads interlacing between any surface layer weft and surface layer warp is 4; the bottom layer is formed by interlacing bottom layer warp and bottom layer weft, wherein the number of warp threads interlacing between any bottom layer weft and bottom layer warp is 8.

[0005] According to one embodiment of this application, the surface weft yarn is a long floating yarn, and the bottom weft yarn is a long floating yarn.

[0006] According to one embodiment of this application, the outer layer is formed by weaving the outer layer warp and outer layer weft using a 4-harness satin weave; the inner layer is formed by weaving the inner layer warp and inner layer weft using an 8-harness satin weave.

[0007] According to one embodiment of this application, the bottom weft yarn is made of nylon monofilament and polyester monofilament, and the ratio of the number of nylon monofilament and the number of the number of polyester monofilament in the bottom weft yarn is 2:1.

[0008] According to one embodiment of this application, the paper forming wire is formed by interlacing warp and weft threads using 16 heald frames.

[0009] According to one embodiment of this application, the forming mesh is composed of a plurality of minimum organizational units, one of which includes a surface layer unit, a connecting layer unit and a bottom layer unit, and the minimum organizational unit includes 16 warp threads and 144 weft threads.

[0010] According to one embodiment of this application, the ratio of the number of surface warp threads to the number of bottom warp threads is 1:1.

[0011] According to one embodiment of this application, the ratio of the sum of the number of surface layer weft threads and the number of connecting weft threads in the connecting layer to the number of bottom layer weft threads is 2:1.

[0012] According to one embodiment of this application, the number of weft threads in the connecting layer accounts for 2 / 6 of the total number of weft threads in the paper forming wire.

[0013] To solve the above-mentioned technical problems, another technical solution adopted in this application is: a papermaking device, including any of the paper forming wires described above.

[0014] The beneficial effects of this application are as follows: Unlike existing technologies, this application adjusts the structural design of the paper forming wire, resulting in a more reasonable number of interlacing points for the surface warp and weft threads. Specifically, compared to paper forming wires using a plain weave method, the paper forming wire in this application has more interlacing points, resulting in greater free space within the wire and faster dewatering. Furthermore, the limited number of interlacing points for the surface warp and weft threads ensures a smoother surface and a more even and finer paper. The reasonable number of interlacing points for the surface warp and weft threads in the paper forming wire of this application improves permeability while maintaining surface smoothness. The reasonable number of interlacing points for the bottom layer weft and warp threads, with fewer interlacing points in the bottom layer than in the surface layer, further enhances the dewatering capacity and speed of the paper forming wire. Additionally, the larger span of the bottom layer weft threads ensures improved wear resistance and extends the service life of the paper forming wire. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0016] Figure 1 This is a schematic diagram of the woven mesh structure of the smallest unit in one embodiment of the paper forming wire of this application;

[0017] Figure 2 yes Figure 1 A schematic diagram of a method for step-by-step weaving of the 1st to 20th weft threads in the smallest organizational unit;

[0018] Figure 3 yes Figure 1 A schematic diagram of a method for step-by-step weaving of the 21st to 40th weft threads in the smallest organizational unit;

[0019] Figure 4 yes Figure 1A schematic diagram of a method for step-by-step weaving of the 41st to 60th weft threads in the smallest organizational unit;

[0020] Figure 5 yes Figure 1 A schematic diagram of a method for step-by-step weaving of the 61st to 80th weft threads in the smallest organizational unit;

[0021] Figure 6 yes Figure 1 A schematic diagram of a method for step-by-step weaving of the 81st to 100th weft threads in the smallest organizational unit;

[0022] Figure 7 yes Figure 1 A schematic diagram of a method for step-by-step weaving of the 101st to 120th weft threads in the smallest organizational unit;

[0023] Figure 8 yes Figure 1 A schematic diagram of a method for step-by-step weaving of the 121st to 144th weft threads in the smallest organizational unit;

[0024] Figure 9 This is a schematic diagram of the structure of an embodiment of the papermaking equipment of this application. Detailed Implementation

[0025] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0026] Through long-term research, the inventors of this application have discovered that existing paper forming wires typically have a plain weave design on the surface layer, with many warp and weft interlacing points. The fabric surface is relatively flat and dense, resulting in slow dehydration speed and insufficient dehydration capacity. Furthermore, the bottom layer of the paper forming wire has a short service life.

[0027] Therefore, this application needs to provide a paper forming wire 100 that, while ensuring paper quality, can improve dewatering capacity and dewatering speed; and further ensure the papermaking equipment 200 (see...). Figure 9 High-speed operation reduces paper breakage, extends service life, reduces downtime, and increases operating efficiency.

[0028] Please see Figures 1 to 8This application provides a paper forming wire 100 according to one embodiment. The paper forming wire 100 includes a surface layer 110 (also called a paper forming layer), a connecting layer 120, and a bottom layer 130 (also called a machine layer). The connecting layer 120 is used to connect the surface layer 110 and the bottom layer 130. The surface layer 110 is formed by interlacing surface layer warp threads 111 and surface layer weft threads 112. The bottom layer 130 is formed by interlacing bottom layer warp threads 131 and bottom layer weft threads 132. The number of warp threads that interlace between any surface layer weft thread 112 and surface layer warp thread 111 is 4. The number of warp threads that interlace between any bottom layer weft thread 132 and bottom layer warp thread 131 is 8.

[0029] This application adjusts the structural design of the paper forming wire 100, resulting in a reasonable number of interlacing points for the surface warp 111 and surface weft 112 of the surface layer 110. Specifically, compared to conventional paper forming wires using a plain weave method, the paper forming wire 100 in this application has more interlacing points, resulting in a larger amount of free space within the paper forming wire 100 and faster dewatering. Furthermore, the limited number of interlacing points for the surface warp 111 and surface weft 112 of the surface layer 110 leads to a relatively smoother surface and a smoother, finer paper. The reasonable number of interlacing points for the surface warp 111 and surface weft 112 of the surface layer 110 in the paper forming wire 100 of this application improves permeability while maintaining surface smoothness. The interlacing points of the bottom weft 132 and bottom warp 131 of the bottom layer 130 are arranged reasonably. The number of warp and weft interlacing points of the bottom layer 130 is less than that of the surface layer 110, which further improves the dewatering capacity and dewatering speed of the paper forming wire 100. In addition, the large span of the bottom weft 132 ensures that the wear resistance of the paper forming wire 100 is improved and the service life of the paper forming wire 100 is extended.

[0030] The paper forming wire 100 of this application can improve dewatering capacity and dewatering speed while ensuring paper quality, ensure high-speed operation of papermaking equipment 200, reduce the number of paper breaks, reduce downtime, and increase operating efficiency.

[0031] It should be noted that the number of meridians between any surface latitude parallel 112 and surface longitude parallel 111 is 4. Specifically, if a surface latitude parallel 112 intersects with the first surface longitude parallel 111, the next intersect will be with the fifth surface longitude parallel 111. The number of meridians between any bottom latitude parallel 132 and bottom longitude parallel 131 is 8. Specifically, if a bottom latitude parallel 132 intersects with the first bottom longitude parallel 131, the next intersect will be with the ninth bottom longitude parallel 131; or it can mean that a bottom latitude parallel 132 intersects with only one of any eight adjacent bottom longitude parallels 131.

[0032] Among them, the surface layer 110 is formed by weaving the surface layer warp 111 and the surface layer weft 112 using a 4-harness satin weave.

[0033] Specifically, the weft yarns 112 are long floats. These weft yarns 112 float longer than the warp yarns 111 on the surface of the paper forming wire 100. The long floats formed by the weft yarns 112 appear on the surface of the surface layer 110 of the paper forming wire 100, making the paper forming wire 100 smoother and increasing fiber retention. The paper forming wire 100 has uniform mesh size and a smooth surface, resulting in uniform paper sheet formation, easy peeling of the paper sheet from the wire, and a smoother, finer paper, thus meeting the needs of high-speed tissue paper making machines.

[0034] Among them, the bottom layer 130 is formed by weaving the bottom warp 131 and the bottom weft 132 using an 8-harness satin weave.

[0035] Specifically, the bottom weft yarn 132 is a long float. The bottom weft yarn 132 floats more on the surface of the bottom warp yarn 131. The long float formed by the bottom weft yarn 132 will appear on the surface of the bottom layer 130 of the paper forming wire 100. The bottom weft yarn 132 floats down more, the bottom weft yarn 132 has a larger contact area with the machine, and more bottom weft yarns 132 participate in wear. The bottom layer 130 is more wear-resistant as a whole, which extends the service life of the paper forming wire 100.

[0036] In some embodiments, the ratio of the number of face layer warp 111 to the number of bottom layer warp 131 is 1:1. Therefore, the number of face layer warp 111 and bottom layer warp 131 is roughly equal, the fiber support index of the face layer 110 is high, the fiber retention rate is high, and the paper quality is good.

[0037] In some embodiments, the bottom weft 132 is made of nylon monofilament and polyester monofilament, with a ratio of 2:1. A higher proportion of nylon monofilament in the bottom weft 132 improves its abrasion resistance, thereby extending the service life of the paper forming wire 100. Furthermore, nylon monofilament not only has high abrasion resistance but is also low in cost, allowing for improved abrasion resistance of the bottom layer 130 at a lower cost, thus enhancing the product quality of the paper forming wire 100.

[0038] In one embodiment, the ratio of the sum of the number of surface weft threads 112 and the number of connecting weft threads 121 in the connecting layer 120 to the number of bottom weft threads 132 is 2:1. By adopting the above weft thread ratio, the overall thickness of the paper forming wire 100 is reduced, the water content inside the wire is low, and water is not spun out during operation.

[0039] Furthermore, at this ratio, the number of bottom weft threads 132 is smaller, and the bottom weft threads 132 can be thicker, resulting in higher wear resistance and improved service life of the paper forming wire 100. It should be noted that in this embodiment, the surface weft threads 112 only include surface weft threads 112 and do not include the connecting weft threads 121 of the connecting layer 120. In other embodiments, since in the field of papermaking technology, two paired connecting weft threads 121 in the connecting layer 120 of the paper forming wire 100 are equivalent to one surface weft thread 112, the aforementioned ratio of weft threads can also be described as a ratio of surface weft threads 112 to bottom weft threads 132 of 2:1. In this case, the number of surface weft threads 112 includes the number of connecting weft threads 121 of the connecting layer 120.

[0040] In some embodiments, the number of weft threads in the connecting layer 120 accounts for 2 / 6 of the total number of weft threads in the paper forming wire 100. The total number of weft threads in the paper forming wire 100 includes the number of surface layer weft threads 112, the number of connecting weft threads 121 in the connecting layer 120, and the number of bottom layer weft threads 132. The connecting weft threads 121 in the connecting layer 120 tightly bond the surface layer 110 and the bottom layer 130, resulting in good structural stability of the paper forming wire 100.

[0041] In some embodiments, the connecting weft threads 121 of the connecting layer 120 interweave in pairs, including a first connecting weft thread and a second connecting weft thread. The two pairs of connecting weft threads 121 interweave between the surface warp threads 111 and the bottom warp threads 131, thereby connecting the surface layer 110 and the bottom layer 130, resulting in a tighter and more secure connection between the surface layer 110 and the bottom layer 130. Furthermore, the connecting weft threads 121 of the connecting layer 120 can be made of a material with a relatively large shrinkage rate to further ensure that the surface layer 110 and the bottom layer 130 do not shift and the connection is even stronger.

[0042] In some embodiments, the paper forming wire 100 is formed by interlacing warp and weft threads using 16 heald frames.

[0043] Specifically, the surface layer 110 includes multiple surface layer units, the connecting layer 120 includes multiple connecting layer units, and the bottom layer 130 includes multiple bottom layer units. The forming mesh 100 is composed of multiple minimum organizational units. Each minimum organizational unit includes a surface layer unit, a connecting layer unit, and a bottom layer unit. Each minimum organizational unit includes 16 warp threads and 144 weft threads. Among them, the surface layer has 8 warp threads 111, the bottom layer has 8 warp threads 131, and the surface layer weft threads 112, the bottom layer weft threads 132, and the connecting weft threads 121 are arranged alternately, with a total of 144 weft threads in one organizational cycle.

[0044] The warp yarn 111 and weft yarn 112 of the surface layer can both be made of polyester monofilament. The connecting weft yarn 121 is made of nylon material, connecting the surface layer 110 and the bottom layer 130.

[0045] Please continue reading. Figures 2 to 8 , Figures 2 to 8 The process of interlacing 144 weft threads and 16 warp threads in the smallest organizational unit of the paper forming wire 100 of this application is given. Specifically, the first weft thread is the surface weft thread 112, the second is the bottom weft thread 132, the third is the surface weft thread 112, the fourth is the connecting weft thread 121, the fifth is the bottom weft thread 132, the sixth is the connecting weft thread 121, and so on in a cycle. The ratio of the number of surface warp threads 111 to the number of bottom warp threads 131 is 1:1; the ratio of the sum of the number of surface weft threads 112 and the number of connecting weft threads 121 in the connecting layer 120 to the number of bottom weft threads 132 is 2:1.

[0046] In summary, the paper forming wire 100 of this application uses a 4-harness satin weave for its surface layer 110, resulting in a large amount of free space within the wire and rapid dewatering, which helps to improve paper machine speed. The ratio of the sum of the weft threads of the surface layer 110 and the connecting layer 120 to the weft thread of the bottom layer 130 is 2:1, resulting in a thinner paper forming wire 100 with lower moisture content and less water spillage during operation. The bottom layer 130 uses an 8-harness satin weave, with a 2:1 ratio of nylon to polyester in the bottom weft threads 132, leading to a longer service life and higher operating efficiency. Because the ratio of the warp threads 111 of the surface layer to the warp threads 131 of the bottom layer is 1:1, the surface layer 110 has a high fiber support index, high fiber retention, and good paper quality.

[0047] The performance of the novel SSB paper forming wire 100 of this application is illustrated below with specific embodiments.

[0048] Example 1

[0049] In this embodiment, 16 heald frames are used to weave polyester or nylon monofilaments into three different weaving structures: surface layer 110, connecting layer 120, and bottom layer 130, which are connected to form an integral paper forming net 100, with 16 warp threads and 144 weft threads as a minimum organizational unit.

[0050] In this embodiment, the surface warp 111 is made of polyester monofilament with a diameter of 0.22 mm, and the surface weft 112 is made of polyester monofilament with a diameter of 0.20 mm. The surface layer 110 is woven using a 4-harness satin weave. The bottom warp 131 is made of polyester monofilament with a diameter of 0.27 mm. The bottom weft 132 uses an alternating ratio of two nylon monofilaments and one polyester monofilament, with a diameter of 0.45 mm. The bottom layer 130 is woven using an 8-harness satin weave with long floats. The first and second connecting wefts of the connecting layer 120 are made of nylon monofilament with a diameter of 0.20 mm. They connect the surface layer 110 and the bottom layer 130, both interweaving with the surface warp 111 to support the paper surface and ensure the finished paper is smooth and flat, and interweaving with the bottom warp 131 to sew the surface layer 110 and the bottom layer 130 together, while also increasing the abrasion resistance of the bottom layer 130. The paper forming wire 100 obtained in Example 1 was tested using the method in GB / T 24290-2009 "Measurement Method of Paper Forming Wire 100 and Drying Wire". Its warp density was 41 threads / cm (20.5 threads / cm of the surface warp and 20.5 threads / cm of the bottom warp), and its weft density was 45.0 threads / cm (15.0 threads / cm of the surface weft, 15.0 threads / cm of the bottom weft, and 15.0 threads / cm of the connecting thread). Other performance tests are shown in Table 1 below.

[0051] Example 2

[0052] In this embodiment, 16 heald frames are used to weave polyester or nylon monofilaments into three different weaving structures: surface layer 110, connecting layer 120, and bottom layer 130, which are connected to form an integral paper forming net 100, with 16 warp threads and 144 weft threads as a minimum organizational unit.

[0053] In this embodiment, the surface warp 111 is made of polyester monofilament with a diameter of 0.22 mm, and the surface weft 112 is made of polyester monofilament with a diameter of 0.22 mm. The surface layer 110 is woven using a 4-harness satin weave. The bottom warp 131 is made of polyester monofilament with a diameter of 0.27 mm, and the bottom weft 132 uses an alternating ratio of two nylon monofilaments and one polyester monofilament. The bottom weft 132 has a diameter of 0.50 mm and is woven using an 8-harness satin weave with long floats. The first and second connecting wefts of the connecting layer 120 are made of nylon monofilament with a diameter of 0.22 mm. They connect the surface layer 110 and the bottom layer 130, interweaving with the surface warp 111 to support the paper surface and ensure the finished paper is flat and smooth. They also interweave with the bottom warp 131 to sew the surface layer 110 and the bottom layer 130 together, while increasing the abrasion resistance of the bottom layer 130. The paper forming wire 100 obtained in Example 2 was tested using the method in GB / T 24290-2009 "Measurement Method of Paper Forming Wire 100 and Drying Wire". Its warp density was 41 threads / cm (20.5 threads / cm of the surface warp and 20.5 threads / cm of the bottom warp), and its weft density was 39.0 threads / cm (13.0 threads / cm of the surface weft, 13.0 threads / cm of the bottom weft, and 13.0 threads / cm of the connecting thread). Other performance tests are shown in Table 1 below.

[0054] Table 1: Performance Test Results of Paper Forming Wire

[0055] performance Example 1 Example 2 Forming mesh thickness 1.38mm 1.44mm Fiber Support Index (FSI) 111 101 Support Point (SP) 461 400 Dehydration Index (DI) 25.4 23.2 Tensile strength (N / cm) 1390 1280 CFM (Chemical Air Quality) 450 470

[0056] As can be seen from the data in Table 1, the paper forming wire 100 provided in this application has a high fiber support index and a large number of support points, indicating that the paper forming wire 100 in this embodiment improves the retention rate of paper fibers and fillers, resulting in better paper sheet forming quality. The high dewatering index, high air permeability, and low thickness indicate significantly enhanced filtration, and greatly improved dewatering speed and capacity. Simultaneously, it also has high tensile strength, good wear resistance, and a long service life.

[0057] Please see Figure 9 , Figure 9 This is a schematic diagram of the structure of one embodiment of the papermaking equipment 200 of this application. The papermaking equipment 200 of this application includes the paper forming wire 100 in any of the above embodiments.

[0058] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A paper forming wire, characterized in that, It includes a top layer, a connecting layer, and a bottom layer, wherein the connecting layer is used to connect the top layer and the bottom layer; The surface layer is formed by interlacing surface layer warp and surface layer weft, wherein the number of warp threads between any surface layer weft and surface layer warp is 4; The bottom layer is formed by interlacing bottom warp and bottom weft threads, wherein the number of warp threads between any one of the bottom weft threads and the bottom warp thread is 8.

2. The paper forming wire according to claim 1, characterized in that, The surface weft threads are long floating threads, and the bottom weft threads are long floating threads.

3. The paper forming wire according to claim 1, characterized in that, The outer layer is formed by weaving the outer layer warp and outer layer weft using a 4-harness satin weave; the inner layer is formed by weaving the inner layer warp and inner layer weft using an 8-harness satin weave.

4. The paper forming wire according to any one of claims 1-3, characterized in that, The bottom weft yarn is made of nylon monofilament and polyester monofilament, and the ratio of the nylon monofilament to the polyester monofilament in the bottom weft yarn is 2:

1.

5. The paper forming wire according to claim 1, characterized in that, The paper forming wire is made of 16 heddles interwoven with warp and weft threads.

6. The paper forming wire according to claim 5, characterized in that, The forming mesh is composed of multiple minimum organizational units. Each minimum organizational unit includes a surface layer unit, a connecting layer unit, and a bottom layer unit. Each minimum organizational unit includes 16 warp threads and 144 weft threads.

7. The paper forming wire according to claim 1, characterized in that, The ratio of the number of surface warp lines to the number of bottom warp lines is 1:

1.

8. The paper forming wire according to claim 1, characterized in that, The ratio of the sum of the number of weft threads in the surface layer and the number of connecting weft threads in the connecting layer to the number of weft threads in the bottom layer is 2:

1.

9. The paper forming wire according to claim 1, characterized in that, The number of weft threads in the connecting layer accounts for 2 / 6 of the total number of weft threads in the paper forming wire.

10. A papermaking device, characterized in that, Includes the paper forming wire according to any one of claims 1-9.

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