Drying net for papermaking and papermaking machine

Abstract

The utility model discloses a drying net for papermaking and a papermaking machine, the drying net for papermaking comprises system warps, first system wefts and second system wefts, and the first system wefts and the system warps are interwoven to form a paper forming layer of the drying net for papermaking; the second system wefts and the system warps are interwoven to form a machine layer of the drying net for papermaking; the first system wefts and the second system wefts have the same diameter; the minimum organization unit of the drying net for papermaking is composed of 4 warps and 16 wefts. In this way, the stability and tensile strength of the drying net for papermaking can be improved, and the service life is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of papermaking, and in particular to a drying net for papermaking and a papermaking machine. Background Art

[0002] The papermaking drying fabric is an important dehydration material in the drying section of the paper machine. Its main function is to support the wet paper sheets, improve the flatness of the paper, remove excess moisture from the paper sheets, and form dry paper sheets.

[0003] With the development of papermaking industry, the speed of paper machines is getting faster and faster, and the width is getting wider and wider, which puts higher and higher requirements on the strength, service life and drying capacity of the drying fabric.

[0004] The inventors of the present application have found in long-term research that although the warp systems of most existing papermaking drying nets use single filaments with rectangular cross-sections to increase the contact area with the paper sheets, particles such as rosin and latex in the paper sheets are easily adsorbed on the surface of the drying nets, which are not easy to clean and affect the drying effect. Therefore, some drying nets use single filaments with arc-shaped cross-sections to improve the cleaning effect. However, this type of drying net has poor stability and low tensile strength. It is easy to hydrolyze and split during use, resulting in fuzzing, and has a low service life, which cannot meet customer requirements. Utility Model Content

[0005] The main technical problem solved by the present application is to provide a papermaking drying wire and a papermaking machine, which can improve the stability and tensile strength of the papermaking drying wire and extend its service life.

[0006] In order to solve the above technical problems, a technical solution adopted in the present application is: to provide a drying mesh for papermaking, comprising: a system warp; a first system weft, interwoven with the system warp to form a paper-forming layer of the drying mesh for papermaking; a second system weft, interwoven with the system warp to form a machine layer of the drying mesh for papermaking; wherein the diameter of the first system weft is the same as that of the second system weft; wherein the smallest organizational unit of the drying mesh for papermaking is composed of 4 warps and 16 wefts.

[0007] The diameter of the first system weft is 0.8-1.2 mm, and the diameter of the second system weft is 0.8-1.2 mm.

[0008] The system warp and the first system weft are interwoven with four-harness satin weaving to form the paper-forming layer of the papermaking drying net; the system warp and the second system weft are interwoven with four-harness satin weaving to form the machine layer of the papermaking drying net.

[0009] The ratio of the number of latitudes of the first system to the number of latitudes of the second system is 1:1.

[0010] The cross section of the first system latitude is circular, the cross section of the second system latitude is circular, and the cross section of the system meridian is rectangular.

[0011] Wherein, the first system weft yarn is a highly hydrolysis-resistant polyester round yarn, and the second system weft yarn is a highly hydrolysis-resistant polyester round yarn.

[0012] Wherein, the system warp is a highly hydrolysis-resistant polyester flat yarn.

[0013] The papermaking drying wire is formed by interweaving polyester monofilaments with 16 heald frames.

[0014] Wherein, the air permeability of the papermaking drying wire ranges from 110CFM to 500CFM.

[0015] In order to solve the above technical problem, another technical solution adopted in the present application is: to provide a papermaking machine, comprising the papermaking drying wire described in the above technical solution.

[0016] The beneficial effects of the present application are as follows: different from the prior art, the papermaking drying net in the present application includes: system warp threads, first system weft threads and second system weft threads, wherein the first system weft threads and the system warp threads are interwoven to form a paper-forming layer of the papermaking drying net; the second system weft threads and the system warp threads are interwoven to form a machine layer of the papermaking drying net; the diameters of the first system weft threads and the second system weft threads are the same; the smallest organizational unit of the papermaking drying net is composed of 4 warp threads and 16 weft threads, and by setting the diameters of the first system weft threads and the second system weft threads to be the same, the stability and tensile strength of the papermaking drying net are improved, and the service life is extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0018] Figure 1 This is a schematic structural diagram of an embodiment of a drying wire for papermaking of the present application;

[0019] Figure 2 It is a schematic diagram of the weaving pattern of the smallest organizational unit of a drying fabric for papermaking of the present application;

[0020] Figure 3 yes Figure 2 A structural schematic diagram of an implementation method of weft weaving in steps of the smallest organizational unit;

[0021] Figure 4 It is a structural schematic diagram of an embodiment of a papermaking machine of the present application. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0023] See also Figure 1 and Figure 2 , Figure 1 This is a schematic structural diagram of an embodiment of a drying wire for papermaking of the present application. Figure 2 It is a schematic diagram of a woven mesh pattern of an embodiment of the minimum organizational unit of a papermaking drying fabric of the present application. The papermaking drying fabric 1 comprises: a system warp 30, a first system weft 10 and a second system weft 20, wherein the first system weft 10 and the system warp 30 are interwoven to form a paper-forming layer 100 of the papermaking drying fabric 1, and the second system weft 20 and the system warp 30 are interwoven to form a machine layer 200 of the papermaking drying fabric 1, the first system weft 10 and the second system weft 20 have the same diameter, and the minimum organizational unit of the papermaking drying fabric 1 is composed of 4 warps and 16 wefts.

[0024] Specifically, the system warp 30 includes a plurality of warps, the first system weft 10 includes a plurality of wefts, and the second system weft 20 includes a plurality of wefts. The first system weft 10 and the system warp 30 are interwoven according to a certain texture structure to form a paper layer 100, and the second system weft 20 and the system warp 30 are interwoven according to a certain texture structure to form a machine layer 200. The paper layer 100 is a paper pasting surface, and the machine layer 200 is a cylinder pasting surface. The papermaking drying net 1 using a single system warp 30 structure has a large mesh gap, and particles such as rosin and latex in the paper sheet are not easily adsorbed on the surface of the drying net, which is easy to clean, thereby indirectly increasing its service life.

[0025] Furthermore, the first system wefts 10 and the second system wefts 20 are arranged vertically, and the diameters of the first system wefts 10 and the second system wefts 20 are the same, which improves the stability of the papermaking drying wire 1, enhances the tensile strength of the papermaking drying wire 1, and prolongs its service life.

[0026] The papermaking drying mesh 1 in the present application comprises: a system warp 30, a first system weft 10 and a second system weft 20, wherein the first system weft 10 and the system warp 30 are interwoven to form a paper-forming layer 100 of the papermaking drying mesh 1; the second system weft 20 and the system warp 30 are interwoven to form a machine layer 200 of the papermaking drying mesh 1; the first system weft 10 and the second system weft 20 have the same diameter; the minimum organizational unit of the papermaking drying mesh 1 is composed of 4 warps and 16 wefts, and by setting the first system weft 10 and the second system weft 20 to have the same diameter, the stability and tensile strength of the papermaking drying mesh 1 are improved, and the service life is extended.

[0027] In one application scenario, the diameter of the first system weft 10 is 0.8-1.2 mm, and the diameter of the second system weft 20 is 0.8-1.2 mm.

[0028] Specifically, the diameters of the first system wefts 10 and the second system wefts 20 can be 0.8 mm, 0.9 mm, 1.0 mm, etc. By setting the diameters of the first system wefts 10 and the second system wefts 20 to be thicker, the stability of the papermaking drying wire 1 is further improved, the tensile strength of the papermaking drying wire 1 is enhanced, the wear resistance is better, and the service life is extended.

[0029] Optionally, the system warp threads 30 and the first system weft threads 10 are interwoven with a four-harness satin weave to form a paper-forming layer 100 of the papermaking drying fabric 1; the system warp threads 30 and the second system weft threads 20 are interwoven with a four-harness satin weave to form a machine layer 200 of the papermaking drying fabric 1.

[0030] Specifically, the paper layer 100 and the machine layer 200 formed by the four-harness satin weaving method have good stability, minimal longitudinal extension, no transverse shrinkage, and strong hydrolysis resistance.

[0031] Among them, the satin weave is different from the plain weave and twill weave. The satin structure warp (or weft) formed by the satin weave has longer floating lines and fewer interlacing points. Although diagonal lines are formed, they are not continuous, and the distance between them is regular and uniform. The satin structure formed by the satin weave is soft in texture, smooth in silk surface, and has better luster. It is more luxurious and gorgeous than the plain fabric formed by the plain weave and the twill fabric formed by the twill weave.

[0032] Optionally, the ratio of the number of the first system weft threads 10 to the number of the second system weft threads 20 is 1:1.

[0033] Specifically, the number of wefts in the first system weft 10 is the same as the number of wefts in the second system weft 20, and the papermaking drying fabric 1 includes a plurality of minimum organizational units, and the minimum organizational unit is composed of 4 warps and 16 wefts.

[0034] In an application scenario, when the ratio of the number of first system weft threads 10 to the number of second system weft threads 20 is 1:1, among the 16 weft threads of the minimum organizational unit, the number of first system weft threads 10 is 8 and the number of second system weft threads 20 is also 8.

[0035] Optionally, the cross-section of the first system weft 10 is circular, the cross-section of the second system weft 20 is circular, and the cross-section of the system warp 30 is rectangular.

[0036] Specifically, the cross section of the system warp line 30 is rectangular, which can increase the contact area between the papermaking drying wire 1 and the paper.

[0037] Please combine Figure 2 See also Figure 3 , Figure 3 yes Figure 2 A structural schematic diagram of an implementation method of step-by-step weaving of the weft thread, the smallest organizational unit in the embodiment.

[0038] Among them, Figure 2 In the figure, unfilled squares represent latitudes below longitudes, and filled squares represent latitudes above longitudes. From top to bottom, there is a cycle of 16 latitudes. The 1st, 3rd, 5th, 7th, 9th, 11th, 13th, and 15th squares are the latitudes 10 of the first system, and the 2nd, 4th, 6th, 8th, 10th, 12th, 14th, and 16th squares are the latitudes 20 of the second system.

[0039] Optionally, the papermaking drying wire 1 is formed by interweaving polyester monofilaments with 16 heald frames, the first system weft yarns 10 are highly hydrolysis-resistant polyester round yarns, the second system weft yarns 20 are highly hydrolysis-resistant polyester round yarns, and the system warp yarns 30 are highly hydrolysis-resistant polyester flat yarns.

[0040] Specifically, the anti-hydrolysis performance of the papermaking drying fabric 1 can be improved by using the warp and weft threads made of highly hydrolysis-resistant polyester material.

[0041] Optionally, the air permeability of the papermaking drying fabric 1 is in the range of 110 CFM-500 CFM.

[0042] Specifically, the papermaking drying wire 1 using a single system warp 30 structure has a wide air permeability range, strong drying capacity, and a wide range of applications.

[0043] The papermaking drying wire 1 of the present application will be further described below in conjunction with two specific embodiments.

[0044] The following two embodiments both adopt 16-piece heald frame weaving, wherein the system warp 30 and the first system weft 10 are interwoven to form a paper layer 100, and the system warp 30 and the second system weft 20 are interwoven to form a machine layer 200, and the ratio of the number of the first system weft 10 to the second system weft 20 is 1:1.

[0045] Embodiment 1: The system warp 30 is a flat wire with a size of 0.44*0.90 mm, and the first system weft 10 and the second system weft 20 are round wires with a diameter of 0.8 mm.

[0046] Embodiment 2: The system warp 30 is a flat wire with a size of 0.44*0.90 mm, and the first system weft 10 and the second system weft 20 are round wires with a diameter of 0.9 mm.

[0047] The papermaking drying wire 1 obtained in Example 1 and Example 2 was monitored by the method in GB / T 24290-2009 "Measurement Methods for Papermaking Forming Wires and Drying Wires", and the performance of the papermaking drying wire 1 was measured as shown in Table 1 below.

[0048] Table 1: Performance test results of papermaking drying wire 1

[0049] performance Example 1 Results Example 2 Results Warp density 12.0 / cm 12.0 / cm Weft density 12.2 / cm 8.3 / cm Drying fabric thickness 1.43mm 1.54mm Tensile Strength 1826N / cm 1940N / cm Breathability 118CFM 498CFM

[0050] It can be seen from Table 1 above that the papermaking drying net 1 provided in the present application has a thinner thickness, stronger tensile strength, and a wider air permeability range. Generally speaking, the thinner the drying net thickness, the faster the drying net dehydrates and the stronger the drying ability; the stronger the tensile strength, the stronger the dimensional stability, wear resistance, and service life of the papermaking drying net 1; the larger the air permeability range, the wider the application range. Therefore, the papermaking drying net 1 in the present application has strong stability, strong drying ability, good wear resistance, wide application range, and long service life.

[0051] See also Figure 4 , Figure 4 It is a schematic structural diagram of an embodiment of a papermaking machine of the present application, wherein the papermaking machine comprises a drying wire 1 for papermaking.

[0052] Specifically, the papermaking drying wire 1 is the papermaking drying wire 1 in any of the above embodiments, and details can be found in the above contents, which will not be described again.

[0053] The above description is only an embodiment of the present application and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A drying wire for papermaking, characterized in that: include: System Warp; A first system of weft threads, interwoven with the system of warp threads, to form a paper-forming layer of the papermaking drying wire; The second system weft is interwoven with the system warp to form a machine layer of the papermaking drying wire; wherein the diameters of the first system weft and the second system weft are the same, the diameter of the first system weft is 0.8-1.2 mm, and the diameter of the second system weft is 0.8-1.2 mm; The smallest organizational unit of the papermaking drying wire is composed of 4 warps and 16 wefts. Wherein, the air permeability of the papermaking drying wire ranges from 110CFM to 500CFM.

2. The papermaking drying wire according to claim 1, characterized in that: The system warp threads and the first system weft threads are interwoven by a four-harness satin weave method to form a paper-forming layer of the papermaking drying wire; The system warp threads and the second system weft threads are interwoven with each other using a four-harness satin weave method to form a machine layer of the papermaking drying wire.

3. The papermaking drying wire according to claim 1, characterized in that: The ratio of the number of weft threads of the first system to the number of weft threads of the second system is 1:

1.

4. The papermaking drying wire according to claim 1, characterized in that: The cross section of the first system weft is circular, the cross section of the second system weft is circular, and the cross section of the system warp is rectangular.

5. The papermaking drying wire according to claim 1, characterized in that: The first system weft yarn is a highly hydrolysis-resistant polyester round yarn, and the second system weft yarn is a highly hydrolysis-resistant polyester round yarn.

6. The papermaking drying wire according to claim 1, characterized in that: The system warp is a highly hydrolysis-resistant polyester flat yarn.

7. The papermaking drying wire according to claim 1, characterized in that: The papermaking drying wire is formed by interweaving polyester monofilaments with 16 heald frames.

8. A papermaking machine, characterized in that: The papermaking drying fabric comprises the drying fabric according to any one of claims 1 to 7.

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