Crosslinked core wire for spiral net and processing method of crosslinked core wire

Abstract

The invention discloses a cross-linked core wire for a spiral net and a processing method of the cross-linked core wire, the cross-linked core wire comprises a core wire body and cross-linked points, the core wire body is composed of two or more monofilaments arranged in parallel, and a gap is formed between every two adjacent monofilaments; a plurality of cross-linking points are arranged on the core wire body and are arranged at intervals along the extension direction of the monofilaments, and the same cross-linking point can be used for fixedly connecting a plurality of monofilaments in the same section area in the core wire body. The processing method comprises the following steps: splitting, leveling and preheating, combining and winding. According to the invention, the plurality of parallel monofilaments are cross-linked and consolidated through a melting and solidifying technology, so that the plurality of monofilaments form a continuous cross-linked core filament with an integral structure, and the micro-unit structures of the monofilament gaps of the cross-linked core filament are stable, so that the air permeability of the spiral net is stable and controllable; the cross-linked core wire can be applied to different filtering scenes by adjusting the gap distance of the monofilaments in the cross-linked core wire, and the processing method is simple, convenient, easy to operate and free of pollution.

Description

Technical Field

[0001] The invention belongs to the technical field of processing and manufacturing spiral meshes, in particular to a cross-linked core wire for a spiral mesh and a processing method thereof. Background Art

[0002] Spiral mesh is a key supporting material for solid-liquid separation widely used in municipal environmental protection, papermaking, and food processing. It is made by winding linear polymer monofilaments through a ring winding machine into spiral rings with different left and right rotation directions. These rings are then intertwined and meshed to form the spiral mesh. To achieve optimal retention accuracy and air and water permeability for different applications, independent core wires (round or flat) are inserted into the spiral ring cavities created by the overlapping rings to adjust the air permeability and adapt to different filtration applications.

[0003] For example, in the municipal field, spiral mesh is used in sludge reduction and dehydration applications after sewage treatment. The sludge is squeezed between two spiral meshes through a belt filter press to complete dehydration. At this time, the core wire and the spiral ring form a multi-layer mesh-like filter structure, which can effectively block the sludge solids and ensure that the dehydrated liquid can pass smoothly.

[0004] However, in the application of this technology, the width of the traditional spiral mesh belt is usually 2.5-5m, which means that the core wires have the same length in the internal span. At the same time, the conventional core wires are independent of each other. The two ends of the core wires are restricted by the rubber edge of the mesh belt, but there is no consolidation point between the core wires in the entire width direction. The middle core wire is less restricted by the rubber edge on both sides, so the core wires are more likely to move relative to each other. Therefore, in the actual sludge dewatering process, the core wires, especially the core wires in the middle of the mesh belt, are easily stretched apart by external forces after being squeezed by external materials. This causes the pores in the middle of the spiral mesh to reach the critical value, and the pore structure is destroyed, resulting in leakage, uneven and unstable filtration efficiency, and other adverse effects.

[0005] Therefore, how to develop a core wire product with a stable and uniform monofilament gap structure, ensuring stable and controllable air permeability, and enhancing deformation resistance through multi-point knotting is a technical point that needs to be solved urgently. Summary of the Invention

[0006] The purpose of the present invention is to address the problems existing in the prior art and provide a cross-linked core wire for a spiral mesh and a processing method thereof; the cross-linked core wire is applied to the spiral mesh so that during the filtration process, the monofilament gaps of the cross-linked core wire structure are stable and uniform, thereby ensuring the stability and controllability of the spiral mesh filter performance and the filtration efficiency, and by adjusting the monofilament gap distance in the cross-linked core wire, it can be applied to different filtration scenarios, and the cross-linking points can improve the consolidation, greatly reducing the number of material leaks, thereby extending the service life of the spiral mesh.

[0007] The purpose of the present invention is to be solved by the following technical solutions:

[0008] A cross-linked core wire for a spiral mesh, characterized in that: the cross-linked core wire includes a core wire body and cross-linking points, the core wire body is composed of two or more monofilaments arranged in parallel, and there is a gap between adjacent monofilaments; multiple cross-linking points are arranged on the core wire body and the cross-linking points are arranged at intervals along the extension direction of the monofilaments, and the same cross-linking point can fixedly connect multiple monofilaments in the same cross-sectional area within the core wire body.

[0009] The distance between the cross-linking points is 10 cm to 30 cm.

[0010] The cross-linking points are obtained by melt-solidification cross-linking, and the melt-solidification cross-linking methods include but are not limited to hot melting and ultrasonic welding.

[0011] The cross-linking points are formed by adjacent monofilaments being melted, solidified and cross-linked, or by adjacent monofilaments being bonded, solidified and cross-linked by molten hot melt adhesive.

[0012] The diameter of the monofilament ranges from 0.4 mm to 1.1 mm.

[0013] The ratio of the minimum width of the gap to the diameter of the monofilament is 0.05-0.2:1, and the minimum width is the distance between two adjacent monofilaments.

[0014] The maximum width of the gap ranges from 0.5 mm to 1.3 mm, and the maximum width is the distance between the centers of two adjacent monofilaments.

[0015] The cross-linking points fill part of the gap, or fill the entire gap without overflowing.

[0016] The monofilament includes but is not limited to round wire and flat wire.

[0017] The monofilament is made of a material with a melting point of 80°C to 250°C, preferably a material with a melting point of 150°C to 220°C.

[0018] If the monofilament is made of polyester, it is preferably made of polyester with a melting point of 200°C to 220°C.

[0019] A method for processing a cross-linked core wire for a spiral mesh, characterized in that the processing method comprises the following steps:

[0020] S1, splitting: feed at least two parallel monofilaments into the processing equipment in parallel, with the spacing between adjacent monofilaments being 0.05 to 0.2 times the diameter of the monofilament;

[0021] S2. Leveling and preheating: The processing equipment preheats the monofilaments constituting the core wire body. The preheating temperature range is 120℃~150℃ and the time is not less than 3s.

[0022] S3, cross-linking: performing melt solidification cross-linking on the monofilaments in the core filament body at intervals along the extension direction of the core filament body, forming cross-linking points on the core filament body that fixedly connect all the monofilaments in the same cross-sectional area, thereby obtaining a cross-linked core filament;

[0023] S4, winding: winding the cross-linked core yarn onto a plastic wire drum.

[0024] The melt solidification cross-linking in step S3 is performed by ultrasonic welding, with an ultrasonic power of not less than 1000 W and an ultrasonic dwell time of not less than 2 seconds, so that the temperature of the monofilament is controlled within the range of -30°C to +10°C, the melting point of the monofilament, and adjacent monofilaments in the same cross-sectional area are softened and adhered to each other, solidifying to form cross-linking points.

[0025] The principle of ultrasonic welding is that when ultrasonic waves act on the contact surface of thermoplastic plastics (monofilaments), they generate high-frequency vibrations of tens of thousands of times per second. This vibration transmits ultrasonic energy to the weld zone through the weldment. Due to the large acoustic resistance of the weld zone, local high temperature will be generated. The plastic has poor thermal conductivity and the high temperature is difficult to dissipate quickly, causing the contact surface of adjacent monofilaments to melt rapidly. After a certain amount of pressure is applied, the molten plastic contact surface fuses into one and forms a strong molecular chain after cooling, generating cross-linking points.

[0026] The melt curing cross-linking in step S3 is performed by hot melt adhesive bonding, and the molten hot melt adhesive is filled into the gaps between adjacent monofilaments, so that adjacent monofilaments in the same cross-sectional area are bonded, cured and cross-linked by the molten hot melt adhesive to form cross-linking points.

[0027] The hot melt adhesive is selected from hot melt adhesives with a melting temperature of 80°C-140°C, preferably hot melt adhesives with a melting temperature of 80°C-110°C.

[0028] The winding in step S4 is to facilitate the use of the cross-linked core wire as a core wire in the subsequent core insertion process of spiral mesh manufacturing.

[0029] A cross-linked core wire for a spiral mesh is used to fill the spiral mesh ring to adjust the mesh surface air permeability. While stabilizing the spiral mesh air permeability to ensure filtration efficiency, it also improves the durability of the spiral mesh and extends its service life.

[0030] Compared with the prior art, the present invention has the following advantages:

[0031] The cross-linked core wire provided by the present invention realizes cross-linking and consolidation between multiple parallel monofilaments through melt solidification technology, so that several monofilaments form a cross-linked core wire with a continuous overall structure. The monofilament gaps of the cross-linked core wire are uniform and stable, ensuring the stability and uniformity of the air permeability of the spiral mesh. At the same time, the cross-linking points of the cross-linked core wire are firm and stable, which improves the durability of the spiral mesh and extends its service life. The processing method is simple, easy to operate and pollution-free.

[0032] After the cross-linked core wire provided by the present invention is filled into the spiral mesh, the single wires in the cross-linked core wire inserted in the spiral mesh can be connected to each other, thereby enhancing the connection strength between the core wires, enabling the cross-linked core wire to withstand large external forces without being easily deformed or broken, and avoiding the phenomenon that a single independent core wire is squeezed and deformed to increase the gap between the core wires, thereby solving the problems of material leakage and low filtration efficiency during use of the spiral mesh, and improving the durability and service life of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Attachment Figure 1 Schematic diagram of the structure of the cross-linked core wire used for the spiral mesh of the present invention.

[0034] Among them: 1—core wire body; 2—monofilament; 3—gap; 4—cross-linking point. DETAILED DESCRIPTION

[0035] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, but not all of the embodiments.

[0036] like Figure 1 As shown: A cross-linked core wire for a spiral mesh, the cross-linked core wire includes a core wire body 1 and cross-linking points 4, the core wire body 1 is composed of two or more monofilaments 2 arranged in parallel, with gaps 3 between adjacent monofilaments 2, the monofilaments 2 including but not limited to round wires and flat wires, the diameter range of the monofilaments 2 is 0.4mm to 1.1mm, and the ratio of the width of the gap 3 to the diameter of the monofilament 2 is 0.05 to 0.2:1; multiple cross-linking points 4 are arranged on the core wire body 1 and are arranged at intervals of 10cm to 30cm along the extension direction of the monofilament 2, and the same cross-linking point 4 can fixedly connect multiple monofilaments 2 at the same cross-sectional area in the core wire body 1.

[0037] The crosslinking points 4 of the crosslinked core yarn are obtained by melt-curing crosslinking. For example, the crosslinking points 4 are formed by melt-curing crosslinking of adjacent monofilaments 2, or by melt-curing crosslinking of adjacent monofilaments 2 by bonding and curing them with molten hot melt adhesive. Melt-curing crosslinking methods include, but are not limited to, hot melt and ultrasonic welding.

[0038] A method for processing a cross-linked core wire for a spiral mesh, the processing method comprising the following steps:

[0039] S1, splitting: feeding at least two parallel monofilaments 2 into the processing equipment in parallel, with the spacing between adjacent monofilaments 2 being 0.05 to 0.2 times the diameter of the monofilament 2;

[0040] S2, leveling and preheating: the processing equipment preheats the monofilament 2 constituting the core wire body 1, the preheating temperature range is 120 ℃ ~ 150 ℃, and the time is not less than 3s;

[0041] S3, cross-linking: melt-solidifying and cross-linking the monofilaments 2 in the core filament body 1 at intervals of 10 cm to 30 cm along the extension direction of the core filament body 1, forming cross-linking points 4 on the core filament body 1 that fixedly connect all the monofilaments 2 in the same cross-sectional area, thereby obtaining a cross-linked core filament;

[0042] S4, winding: winding the cross-linked core yarn onto a plastic wire drum.

[0043] When ultrasonic welding is used for the melt solidification cross-linking in step S3, the ultrasonic power is not less than 1000W and the ultrasonic residence time is not less than 2s, so that the temperature of the monofilament 2 is controlled within the range of -30℃ to +10℃ of the melting point of the monofilament 2, allowing adjacent monofilaments 2 in the same cross-sectional area to soften and adhere to each other and solidify to form cross-linking points 4.

[0044] When the melt-solidification cross-linking in step S3 is performed by hot melt adhesive bonding, the molten hot melt adhesive is filled into the gap 3 between adjacent monofilaments 2, so that adjacent monofilaments 2 at the same cross-sectional area are bonded, solidified and cross-linked by the molten hot melt adhesive to form cross-linking points 4.

[0045] The purpose of winding is to facilitate the use of the cross-linked core wire as a core wire in the subsequent core insertion process of spiral mesh manufacturing.

[0046] Example 1

[0047] This embodiment provides a cross-linked core wire for spiral mesh such as Figure 1 As shown, the cross-linked core wire includes a core wire body 1 and cross-linking points 4. The core wire body 1 is composed of four parallel monofilaments 2. There is a gap 3 between adjacent monofilaments 2. The monofilaments 2 are round wires with a diameter of 0.8 mm and the width of the gap 3 is 0.12 mm. Cross-linking points 4 are arranged on the core wire body 1 with an interval of 15 cm. The cross-linking points 4 are formed by the mutual melting and solidification cross-linking of adjacent monofilaments 2. The same cross-linking point 4 can fixedly connect multiple monofilaments 2 at the same cross-sectional area in the core wire body 1.

[0048] This embodiment provides a method for processing a cross-linked core wire for a spiral mesh. The processing method comprises the following steps:

[0049] S1, splitting: four parallel monofilaments 2 are fed into the processing equipment in parallel, and the spacing between adjacent monofilaments 2 is 0.15 times the diameter of the monofilament 2;

[0050] S2, leveling and preheating: the processing equipment preheats the monofilament 2 constituting the core wire body 1, the preheating temperature range is 140°C, and the time is not less than 5s;

[0051] S3, cross-linking: Ultrasonic welding is performed on the monofilaments 2 in the core filament body 1 at intervals of 15 cm along the extension direction of the core filament body 1, with an ultrasonic power of 1200 W and an ultrasonic dwell time of 4 seconds, so that adjacent monofilaments 2 in the same cross-sectional area are melted, solidified and cross-linked to form cross-linking points 4, thereby obtaining a cross-linked core filament;

[0052] S4, winding: winding the cross-linked core wire onto a plastic wire drum and using it as a core wire in the subsequent core insertion process of spiral mesh manufacturing.

[0053] Example 2

[0054] This embodiment provides a cross-linked core wire for spiral mesh such as Figure 1 As shown, the cross-linked core wire includes a core wire body 1 and cross-linking points 4. The core wire body 1 is composed of four parallel monofilaments 2. There is a gap 3 between adjacent monofilaments 2. The monofilaments 2 are round wires with a diameter of 0.8 mm and the width of the gap 3 is 0.08 mm. Cross-linking points 4 are arranged on the core wire body 1 with an interval of 15 cm. The cross-linking points 4 are formed by the mutual melting and solidification cross-linking of adjacent monofilaments 2. The same cross-linking point 4 can fixedly connect multiple monofilaments 2 at the same cross-sectional area in the core wire body 1.

[0055] This embodiment provides a method for processing a cross-linked core wire for a spiral mesh. The processing method comprises the following steps:

[0056] S1, splitting: four parallel monofilaments 2 are fed into the processing equipment in parallel, and the spacing between adjacent monofilaments 2 is 0.1 times the diameter of the monofilament 2;

[0057] S2, leveling and preheating: the processing equipment preheats the monofilament 2 constituting the core wire body 1, the preheating temperature range is 130°C, and the time is not less than 4 seconds;

[0058] S3, cross-linking: Ultrasonic welding is performed on the monofilaments 2 in the core filament body 1 at intervals of 15 cm along the extension direction of the core filament body 1, with an ultrasonic power of 1200 W and an ultrasonic dwell time of 3 seconds, so that adjacent monofilaments 2 in the same cross-sectional area are melted, solidified and cross-linked to form cross-linking points 4, thereby obtaining a cross-linked core filament;

[0059] S4, winding: winding the cross-linked core wire onto a plastic wire drum and using it as a core wire in the subsequent core insertion process of spiral mesh manufacturing.

[0060] Example 3

[0061] This embodiment provides a cross-linked core wire for spiral mesh such as Figure 1 As shown, the cross-linked core wire includes a core wire body 1 and cross-linking points 4. The core wire body 1 is composed of five parallel monofilaments 2. There is a gap 3 between adjacent monofilaments 2. The monofilaments 2 are round wires with a diameter of 0.7 mm and the width of the gap 3 is 0.14 mm. Cross-linking points 4 are arranged on the core wire body 1 with an interval of 15 cm. The cross-linking points 4 are formed by the mutual melting and solidification cross-linking of adjacent monofilaments 2. The same cross-linking point 4 can fixedly connect multiple monofilaments 2 at the same cross-sectional area in the core wire body 1.

[0062] This embodiment provides a method for processing a cross-linked core wire for a spiral mesh. The processing method comprises the following steps:

[0063] S1, splitting: five parallel monofilaments 2 are fed into the processing equipment in parallel, and the spacing between adjacent monofilaments 2 is 0.2 times the diameter of the monofilament 2;

[0064] S2, leveling and preheating: the processing equipment preheats the monofilament 2 constituting the core wire body 1, the preheating temperature range is 140°C, and the time is not less than 5s;

[0065] S3, cross-linking: Ultrasonic welding is performed on the monofilaments 2 in the core filament body 1 at intervals of 15 cm along the extension direction of the core filament body 1, with an ultrasonic power of 1200 W and an ultrasonic dwell time of 4 seconds, so that adjacent monofilaments 2 in the same cross-sectional area are melted, solidified and cross-linked to form cross-linking points 4, thereby obtaining a cross-linked core filament;

[0066] S4, winding: winding the cross-linked core wire onto a plastic wire drum and using it as a core wire in the subsequent core insertion process of spiral mesh manufacturing.

[0067] When the cross-linked core yarns prepared in the above three embodiments were applied to a spiral mesh, the spiral mesh air permeability test was conducted under a pressure difference of 127 PA. The obtained spiral mesh air permeabilities are shown in Table 1.

[0068]

[0069] Table 1 Example parameters and spiral mesh air permeability when cross-linked core wire is applied to the spiral mesh

[0070] It can be seen that according to different monofilament diameters, monofilament gaps, monofilament gap widths, etc., spiral meshes with different air permeabilities can be obtained, so that suitable spiral meshes can be provided for diverse application fields such as different types of sludge dehydration, pulp separation and juicing.

[0071] The cross-linked core wire for spiral mesh provided by the present invention can be applied to spiral mesh products to improve the core wire channel uniformity during filtration processes such as sludge dehydration and juice squeezing, stabilize the spiral mesh's air permeability, and adjust the air permeability of the spiral mesh by setting the interfilament spacing of the cross-linked core wire, thereby enabling application in different types of solid-liquid separation and filtration. Furthermore, the stable connection structure of the cross-linked core wire prevents core wire deformation and material leakage, thereby improving the durability of the spiral mesh and extending its service life.

[0072] The above embodiments are intended only to illustrate the technical solutions of the present invention, and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. Such modifications or replacements do not deviate from the essence of the corresponding technical solutions of the embodiments of the present invention. Technologies not covered by the present invention can be implemented using existing technologies.

Claims

1. A cross-linked core wire for a spiral mesh, characterized by: The cross-linked core wire comprises a core wire body (1) and cross-linking points (4); the core wire body (1) is composed of two or more monofilaments (2) arranged in parallel, with gaps (3) between adjacent monofilaments (2); a plurality of cross-linking points (4) are arranged on the core wire body (1), and the cross-linking points (4) are arranged at intervals along the extension direction of the monofilaments (2); the same cross-linking point (4) can fixedly connect multiple monofilaments (2) at the same cross-sectional area in the core wire body (1).

2. The cross-linked core wire for spiral mesh according to claim 1, characterized in that: The spacing distance between the cross-linking points (4) is 10 cm to 30 cm.

3. The cross-linked core yarn for spiral mesh according to claim 1, characterized in that: The cross-linking points (4) are obtained by melt-solidification cross-linking, and the melt-solidification cross-linking methods include but are not limited to hot melting and ultrasonic welding.

4. The cross-linked core yarn for spiral mesh according to claim 3, characterized in that: The cross-linking points (4) are formed by adjacent monofilaments (2) being melted, solidified and cross-linked, or by adjacent monofilaments (2) being bonded, solidified and cross-linked by molten hot melt adhesive.

5. The cross-linked core yarn for spiral mesh according to any one of claims 1 to 4, characterized in that: The diameter of the monofilament (2) ranges from 0.4 mm to 1.1 mm.

6. The cross-linked core yarn for spiral mesh according to claim 5, characterized in that: The ratio of the minimum width of the gap (3) to the diameter of the monofilament (2) is 0.05 to 0.2:

1.

7. The cross-linked core yarn for spiral mesh according to claim 1, characterized in that: The monofilament (2) includes but is not limited to round yarn and flat yarn.

8. A method for processing a cross-linked core wire for a spiral mesh, characterized in that: The processing steps are as follows: S1, splitting: feeding at least two parallel monofilaments (2) into the processing equipment in parallel, with the spacing between adjacent monofilaments (2) being 0.05 to 0.2 times the diameter of the monofilaments (2); S2, leveling and preheating: the processing equipment preheats the monofilament (2) constituting the core wire body (1), the preheating temperature range is 120°C to 150°C, and the time is not less than 3s; S3, cross-linking: performing melt solidification cross-linking on the monofilaments (2) in the core wire body (1) at intervals along the extension direction of the core wire body (1), forming cross-linking points (4) on the core wire body (1) that fixedly connect all the monofilaments (2) in the same cross-sectional area, and obtaining a cross-linked core wire; S4, winding: winding the cross-linked core yarn onto a plastic wire drum.

9. The method for processing a cross-linked core wire for a spiral mesh according to claim 8, characterized in that: The melt solidification cross-linking in step S3 is performed by ultrasonic welding, with an ultrasonic power of not less than 1000 W and an ultrasonic dwell time of not less than 2 s, so that the temperature of the monofilament (2) is controlled within the range of -30°C to +10°C of the melting point of the monofilament (2), and adjacent monofilaments (2) in the same cross-sectional area are softened and adhered to each other, solidifying to form cross-linking points (4).

10. The method for processing a cross-linked core wire for a spiral mesh according to claim 8, characterized in that: The melt-solidification cross-linking in step S3 is performed by hot-melt adhesive bonding, and the molten hot-melt adhesive is filled into the gaps (3) between adjacent monofilaments (2), so that adjacent monofilaments (2) in the same cross-sectional area are bonded, solidified and cross-linked by the molten hot-melt adhesive to form cross-linking points (4).

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