A twisted net and a mesh anti-slip knot sealing edge process thereof

Abstract

The application discloses a twisted net and a mesh anti-skid knot edge sealing process thereof, and belongs to the technical field of fishing culture rope net manufacturing, and comprises a net piece twisted and woven by an ultra-high molecular weight polyethylene film split fiber bundle, the net piece is provided with warp film split fiber bundles and weft film split fiber bundles, the warp film split fiber bundles and the weft film split fiber bundles are twisted to form net knots at the intersection positions, and mesh is formed between adjacent net knots; a mesh anti-skid knot edge sealing structure is arranged at the net knot, the mesh anti-skid knot edge sealing structure comprises a mechanical lock unit, an anti-dropping connecting line and a hot-pressing edge sealing layer; the warp fiber bundle and the weft fiber bundle are split and inserted and then twisted again through the mechanical lock unit arranged at the net knot, so that an irreversible mechanical interlocking structure is formed, and the problem that the mesh connection points of the twisted net are prone to loosening and disconnection is fundamentally solved.

Description

Technical Field

[0001] This invention relates to the field of aquaculture rope and net manufacturing technology, and more specifically, to a twisted net and its mesh anti-slip knot sealing process. Background Technology

[0002] Ultra-high molecular weight polyethylene (UHMWPE) fiber has broad application prospects in deep-sea aquaculture, marine engineering, and other fields due to its excellent abrasion resistance, aging resistance, and high strength. Currently, UHMWPE materials based on the membrane splitting method are gradually being used in the manufacture of products such as ropes and nets. In existing twisted net products, the connection points (knots) between the meshes are the most stress-concentrated parts and also the weakest points in the entire net structure, most prone to breakage and detachment.

[0003] Patent CN107012582A discloses a processing method for high-strength polyethylene twisted netting, including primary benzene vapor setting, cooling, and secondary hot steam setting. Compared to existing technologies, this invention has the following advantages: By adding composite additives to the high-strength polyethylene monofilament raw material, the tensile mechanical properties are improved while slightly increasing the thread density. Simultaneously, the primary stretching and initial benzene vapor setting of the woven netting modify the netting, making its spatial structure more complex and its molecular structure more compact, thus increasing its strength. The combination of secondary stretching and hot steam setting reduces the shrinkage rate of the netting, ensuring the quality of the fishing net. Compared to netting of the same specifications, the breaking strength is increased by approximately 3.5%, making it more widely applicable.

[0004] Although the device has many beneficial effects, the mesh of a traditional twisted net is made of multiple strands of yarn twisted together. The connection points between the meshes are maintained only by the friction between the yarns. During long-term use, especially under complex working conditions such as alternating loads and water flow impact, the mesh knots are prone to loosening, which can lead to the meshes coming apart and the meshes failing. Summary of the Invention (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a twisted mesh and its anti-slip knot sealing process, thus solving the aforementioned problems. (II) Technical Solution

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solution: a twisted mesh and its mesh anti-slip knot sealing process, comprising a mesh sheet woven from twisted ultra-high molecular weight polyethylene film-split fiber bundles, the mesh sheet having warp film-split fiber bundles and weft film-split fiber bundles, the warp film-split fiber bundles and weft film-split fiber bundles twisted at the intersection to form a knot, and a mesh is formed between adjacent knots; a mesh anti-slip knot sealing structure is provided at the knot, the mesh anti-slip knot sealing structure including a mechanical locking unit, an anti-detachment connecting line and a hot-press sealing layer; the mechanical locking unit is located at the intersection of the warp film-split fiber bundles and the weft film-split fiber bundles, and is formed by the warp film... The split fiber bundle and the latitudinal split fiber bundle are split into at least two sub-fiber bundles at the intersection. The sub-fiber bundles interweave and twist together again to form an irreversible mechanical interlocking connection. The anti-detachment connecting line extends along the mesh arrangement direction, passes through adjacent mesh knots in sequence, and is wrapped and fixed with the fiber bundles at the mesh knots. The linear density of the anti-detachment connecting line is less than the linear density of the main fiber bundles constituting the mesh. The hot-pressed sealing layer is formed by the surface layer of ultra-high molecular weight polyethylene fiber at the mesh knots and near the mesh root after being heated, and then re-cured. It covers the outside of the mechanical locking unit and connects the sub-fiber bundles, the anti-detachment connecting line, and the adjacent mesh root at the intersection into one unit.

[0007] Preferably, in the mechanical locking unit, the warp and weft split fiber bundles are each split into 2 to 6 sub-fiber bundles. The split sub-fiber bundles first cross each other and then twist twice in the same or opposite direction as the original twisting direction. During the second twisting, at least one interlacing loop is formed between the warp and weft sub-fiber bundles. The twist of the interlacing loop is greater than the twist of the initial knot, and the ends of the sub-fiber bundles after the second twisting are folded back and pressed into the inside of the knot. The insertion method of the sub-fiber bundles includes dividing the warp sub-fiber bundles into upper and lower groups, allowing the weft sub-fiber bundles to pass between the upper and lower groups, and then exchanging the positions of the warp and weft sub-fiber bundles and passing them back in the opposite direction, thereby forming an irreversible mechanical interlock at the knot.

[0008] Preferably, the anti-detachment connecting lines are arranged along the warp direction, the weft direction, or both the warp and weft directions of the mesh. When arranged along both the warp and weft directions, the warp anti-detachment connecting lines and the weft anti-detachment connecting lines cross and intertwine at the mesh knots to form a crisscrossing anti-detachment network. The anti-detachment connecting lines are ultra-high molecular weight polyethylene film-split fiber lines with a viscosity-average molecular weight of 1 million to 6 million and a linear density of 20% to 80% of the linear density of the main fiber bundle. The anti-detachment connecting lines maintain a slack allowance between adjacent mesh knots, and the slack allowance is 1% to 10% of half the mesh size.

[0009] Preferably, the hot-pressed edge sealing layer covers the outer side of the mesh knot and the area at the root of the mesh knot on both sides, with a length of 0.5mm to 5mm, and the thickness of the hot-pressed edge sealing layer is 0.05mm to 0.5mm. The hot-pressed edge sealing layer is formed by melting and solidifying the surface layer of ultra-high molecular weight polyethylene fiber, while retaining the core of the fiber bundle that is not completely melted inside. The outer surface of the hot-pressed edge sealing layer has a rounded transition and forms a smooth anti-slip edge sealing surface on the outer side of the mesh knot. The anti-slip edge sealing surface is fused and fixed to the part of the anti-detachment connecting line wrapped around the mesh knot.

[0010] Preferably, the mesh shape of the mesh sheet is one or more of rhombus, square, and rectangular, and the half-mesh size is 20mm to 200mm; the viscosity-average molecular weight of the ultra-high molecular weight polyethylene film-split fiber bundle is 1 million to 6 million, the thickness is 20μm to 100μm, and the width is 6mm to 18mm; the linear density of the warp film-split fiber bundle and the weft film-split fiber bundle is the same or different, and the mesh anti-slip knot sealing structure is also provided at the mesh knot at the edge of the mesh sheet.

[0011] Preferably, the periphery of the mesh is further provided with an edge sealing strip. The edge sealing strip is formed by hot-pressing and melting the ends of the meridional and weft membrane fiber bundles at the edge of the mesh and then integrating them with the hot-pressed sealing layer at the edge knot. The edge sealing strip is arranged continuously or intermittently along the edge of the mesh, and reinforcing sealing points are also provided at intervals on the edge sealing strip. The anti-detachment connecting line at the reinforcing sealing point is folded back and wrapped and fixed with the edge knot.

[0012] A process for sealing the anti-slip knot of twisted wire mesh, characterized by comprising the following steps: Step 1: Preparation of membrane-splitting fibers: Ultra-high molecular weight polyethylene film with a viscosity-average molecular weight of 1 million to 6 million is cut into membrane-splitting fiber bundles with a thickness of 20 μm to 100 μm and a width of 6 mm to 18 mm using a membrane splitting device. Step 2, Twisting and Weaving: The membrane split fiber bundles are fed into the twisting and weaving equipment as warp and weft fibers, and cross-twisting and weaving are performed to form a preliminary web at each intersection of the warp and weft fiber bundles; Step 3, anti-slip knot locking treatment: At each initial knot, the warp fiber bundle and the weft fiber bundle are separated into at least two sub-fiber bundles. The separated sub-fiber bundles are interlaced and then twisted back together to form a mechanically interlocked knot locking structure. Step 4: Setting up anti-detachment connecting lines: Set up at least one anti-detachment connecting line along the mesh arrangement direction, so that the anti-detachment connecting line passes through each mesh knot in sequence and is wrapped and fixed with the fiber bundle at the mesh knot; Step 5, Hot-press sealing and shaping: Apply heat and pressure to each knot that has been locked with anti-slip knots and the root of the knot near the knot, so that the surface layer of ultra-high molecular weight polyethylene fiber partially melts and then re-solidifies to form a hot-press sealing layer covering the outside of the knot. Step 6: Cooling and curing: Cool the hot-pressed edge-sealing mesh to fully cure the hot-pressed edge-sealing layer and obtain a mesh anti-slip edge-sealing structure.

[0013] Preferably, in step three, the number of sub-fiber bundles split is 2 to 6 strands; during splitting and interlacing, the warp fiber bundles are first divided into the first group and the second group, and the weft fiber bundles are divided into the third group and the fourth group, so that the first group and the third group cross, and the second group and the fourth group cross, and then the crossed sub-fiber bundles are reversed and twisted a second time; the twist direction of the second twist is opposite to the twist direction of the initial knot, and the twist degree of the second twist is 10% to 60% higher than that of the initial knot; the knots at the edge of the mesh are simultaneously treated with anti-slip knot locking.

[0014] Preferably, in step five, the heating temperature is 120°C to 160°C, the pressure is 0.5MPa to 5.0MPa, and the heating and pressurizing time is 1 second to 10 seconds; the hot-pressing and sealing edge shaping adopts an edge sealing mold, which has a groove adapted to the shape of the mesh and a foot relief groove located on both sides of the groove. The edge sealing mold only heats and presses the mesh and the area of ​​0.5mm to 5mm at the root of the foot on both sides of the mesh, so as not to completely melt the fiber bundle in the middle of the mesh.

[0015] Preferably, in step six, the cooling and curing process employs natural cooling, air cooling, or water cooling. During the cooling process, a tension of 0.1 MPa to 1.0 MPa is applied to the mesh while maintaining the mesh size. After cooling and curing, the anti-detachment connecting wire is fused and fixed to the hot-pressed edge sealing layer. In step four, the anti-loosening connecting lines are set along the warp and weft directions of the mesh. When set along both the warp and weft directions, the warp anti-loosening connecting lines and the weft anti-loosening connecting lines cross and intertwine at the mesh knots to form an anti-loosening network. (III) Beneficial Effects

[0016] Compared with the prior art, the present invention provides a twisted net and its anti-slip knot sealing process, which has the following beneficial effects: 1. This twisted net and its anti-slip knot sealing process solves the problem of easy loosening and separation of the twisted net mesh connection points by setting a mechanical locking unit at the knot, which separates and interweaves the warp and weft fiber bundles and then re-twistangles them to form an irreversible mechanical interlocking structure.

[0017] 2. This twisted wire mesh and its anti-slip knot sealing process, by setting anti-detachment connecting lines between the knots, makes the meshes form an overall structure that restrains each other. Even if a local mesh is damaged, the anti-detachment connecting lines can effectively prevent the detachment from spreading to adjacent meshes, thus avoiding large-area mesh failure.

[0018] 3. The twisted net and its anti-slip knot sealing process, through hot pressing and shaping process, form an ultra-high molecular weight polyethylene melt-cured layer on the outside of the knot, which further enhances the mechanical strength and anti-separation ability of the knot, and improves the breaking strength of the mesh connection point compared with traditional twisted net.

[0019] 4. This twisted mesh and its anti-slip sealing process effectively solve the problem of insufficient connection strength caused by the smooth surface of ultra-high molecular weight polyethylene material, thus extending the service life of the mesh under complex working conditions such as alternating loads and water flow impacts compared to traditional products. The anti-breakage structure and process of this invention are applicable to ultra-high molecular weight polyethylene cracked twisted mesh with different mesh sizes and specifications, and have good versatility and scalability. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the twisted wire mesh of the present invention; Figure 2 This is an enlarged schematic diagram of the anti-disconnection locking structure at the mesh knot of the present invention; Figure 3 This is a schematic diagram of the process of separating, interlacing and re-twisting the warp and weft fiber bundles according to the present invention. Figure 4 This is a schematic diagram of the anti-detachment connection wire configuration method of the present invention; Figure 5 This is a flowchart of the mesh anti-breakage process of the present invention. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figures 1-5 The present invention provides a technical solution: Example 1

[0023] This embodiment provides a twisted wire mesh and its anti-slip knot sealing process, as detailed below.

[0024] (1) Preparation of membrane-split fibers: Ultra-high molecular weight polyethylene film with a viscosity-average molecular weight of 3 million was selected and cut into membrane-split fiber bundles with a thickness of 50 μm and a width of 12 mm using a membrane splitting device. During cutting, the blade spacing and traction speed were controlled to induce microfibrillation at the edges of the fiber bundles and form a small number of fuzzy fibers on the surface, which is beneficial for cohesion during subsequent twisting. The linear density of the obtained membrane-split fiber bundles was approximately 2200 tex.

[0025] (2) Twisting and weaving: The above-mentioned membrane-split fiber bundles are fed into a CNC twisting and weaving machine as warp and weft fibers, respectively. The machine rotates at 30 r / min, and the warp and weft fiber bundles are fed in a cross manner. At each cross point, a preliminary twist is performed to form a preliminary knot. A diamond mesh is formed between adjacent knots, and the half-mesh size is 80 mm. The twist of the preliminary twist is 80 twists per meter, and the twist direction is Z twist.

[0026] (3) Anti-slip knot locking treatment: At each initial knot, the warp and weft fiber bundles are separated into 3 sub-fiber bundles respectively. The specific operation is as follows: use a splitting needle to divide the warp fiber bundle into the first group, the second group, and the third group along the width direction, and divide the weft fiber bundle into the fourth group, the fifth group, and the sixth group. First, cross the first group with the fourth group, the second group with the fifth group, and the third group with the sixth group; then, reverse the direction of the crossed sub-fiber bundles and pass them back, so that the warp sub-fiber bundles and the weft sub-fiber bundles exchange positions. After passing them back, perform secondary twisting in the opposite direction to the initial twisting, with the twist direction being S twist and the twist degree being 110 twists per meter, that is, the twist degree of the secondary twisting is about 37.5% higher than the twist degree of the initial knot. After the secondary twisting, fold back the ends of the sub-fiber bundles and press them into the inside of the knot to form an irreversible mechanical interlocking connection. At this time, a mechanical locking unit is formed at the knot.

[0027] (4) Setting of anti-detachment connecting line: One anti-detachment connecting line is set along the radial arrangement of the mesh. The anti-detachment connecting line is made of ultra-high molecular weight polyethylene film-splitter fiber with a viscosity-average molecular weight of 3 million and a linear density of 1000 tex, which is about 45% of the linear density of the main fiber bundle. The anti-detachment connecting line passes through each knot in sequence, and at each knot, it is wrapped around the warp and weft fiber bundles twice and then tied with a half knot, so that the anti-detachment connecting line and the fiber bundle at the knot are wrapped and fixed. The anti-detachment connecting line between adjacent knots maintains a slack allowance, which is 5% of half the mesh size, i.e., 4 mm. This slack allowance can provide a buffer when the mesh is under stress, and prevent the anti-detachment connecting line from breaking prematurely.

[0028] (5) Hot-press sealing and shaping: The edge sealing die is used to hot-press the edges of each mesh knot after the anti-slip knot locking treatment and the root of the mesh foot near the mesh knot. The edge sealing die has a groove that matches the shape of the mesh knot. The groove depth is 0.3mm, and there are mesh foot relief grooves on both sides of the groove. The relief grooves are 3mm wide. The mesh is placed on the lower die so that the mesh knot is embedded in the groove and the mesh foot falls into the relief groove. The upper die moves down, the heating temperature is 140℃, the pressure is 2.0MPa, and the heating and pressing time is 5 seconds. Under these conditions, the surface layer of the ultra-high molecular weight polyethylene fiber in the mesh knot and the area of ​​about 2mm at the root of the mesh foot on both sides of the mesh knot partially melts, while the fiber core still retains the incompletely melted fiber structure. The molten surface layer flows under pressure and fills the gaps between the sub-fiber bundles, while covering the part of the anti-detachment connecting wire wrapped at the mesh knot.

[0029] (6) Cooling and Curing: The hot-pressed edge-sealed mesh is removed from the mold and cooled to room temperature in a natural environment. During the cooling process, a tension of 0.3 MPa is applied to the mesh, with the tension direction alternating along the warp and weft directions to maintain stable mesh size. After cooling, the hot-pressed edge-sealing layer is completely cured, forming a hot-pressed edge-sealing layer covering the outside of the mechanical locking unit. The thickness of the hot-pressed edge-sealing layer is approximately 0.15 mm, with a rounded transition on the outer surface, forming a smooth, anti-slip edge-sealing surface on the outside of the mesh knot. The anti-detachment connecting line is fused and fixed to the hot-pressed edge-sealing layer, and the roots of adjacent mesh feet are also connected as one unit.

[0030] Tests showed that the twisted net produced in this embodiment exhibited approximately 55% higher breaking strength at the mesh connection points compared to traditional twisted nets. In simulated water flow impact tests, with continuous impact from alternating water flow at a velocity of 2 m / s and a period of 5 seconds, the net's service life was extended by approximately 2.5 times compared to traditional products. After one mesh was manually cut, the loose threads did not spread to adjacent meshes. Example 2

[0031] The difference between this embodiment and Embodiment 1 lies in the following: the molecular weight of the raw material, the specifications of the fiber bundle, the mesh size, the number of sub-fiber bundles split, the setting method of the anti-detachment connecting line, and the hot-pressing edge sealing parameters.

[0032] (1) Preparation of membrane splitting fiber: Select ultra-high molecular weight polyethylene film with a viscosity-average molecular weight of 5 million, and cut it into membrane splitting fiber bundles with a thickness of 30 μm and a width of 8 mm by a membrane splitting device, with a linear density of about 1500 tex.

[0033] (2) Twisting and weaving: a square mesh is used, with a half mesh size of 50mm. The initial twist is 100 twists per meter, and the twist direction is S twist.

[0034] (3) Anti-slip knot locking treatment: At each initial knot, the warp and weft fiber bundles are separated into 4 sub-fiber bundles respectively. First, the warp sub-fiber bundles are divided into two groups, and the weft sub-fiber bundles are divided into two groups. They are cross-interlaced twice, then reversed and twisted twice. The twist direction of the second twist is Z twist, and the twist is 150 twists per meter, which is 50% higher than the twist of the initial knot. The ends of the sub-fiber bundles are folded back and pressed into the inside of the knot.

[0035] (4) Setting of anti-loosening connecting lines: Anti-loosening connecting lines are set in both the warp and weft directions of the mesh. Both the warp and weft anti-loosening connecting lines are made of ultra-high molecular weight polyethylene film-split fiber with a viscosity-average molecular weight of 5 million and a linear density of 600 tex, which is about 40% of the linear density of the main fiber bundle. The warp and weft anti-loosening connecting lines cross at each knot and are wrapped around each other once before being tied together with the fiber bundle at the knot. The slack allowance of the anti-loosening connecting lines between adjacent knots is 8% of half the mesh size, i.e., 4 mm. The warp and weft anti-loosening connecting lines form a crisscrossing anti-loosening network in the mesh.

[0036] (5) Hot-pressing edge sealing: The depth of the edge sealing mold groove is 0.4mm, and the width of the clearance groove is 4mm. The heating temperature is 150℃, the pressure is 3.0MPa, and the heating and pressing time is 4 seconds. The hot-pressing edge sealing layer covers the mesh knot and the root area of ​​the mesh knot on both sides of the approximately 3mm area, with a thickness of approximately 0.2mm.

[0037] (6) Cooling and curing: A combination of air cooling and water cooling is used. First, air cool for 10 seconds, then spray water to cool to room temperature. During the cooling process, a tension of 0.5 MPa is applied to the mesh to maintain the mesh size. According to the test, the mesh obtained in this embodiment has a breaking strength at the mesh connection point that is about 60% higher than that of traditional twisted mesh. In the simulated local damage test, when three adjacent meshes were cut, the anti-detachment connecting wire could still effectively prevent the detachment from spreading to the surrounding area, and the damage range was controlled within 4 meshes; while under the same conditions, the damage range of traditional twisted mesh spread to more than 20 meshes. Example 3

[0038] This embodiment adds an edge sealing strip structure based on embodiment 1.

[0039] (1) The preparation and twisting of the membrane split fiber are the same as in Example 1, and a diamond-shaped twisted mesh with a half mesh size of 80 mm is obtained.

[0040] (2) The anti-slip knot locking treatment is the same as in Example 1, and a mechanical locking unit is formed at each knot.

[0041] (3) The anti-detachment connecting line is set in the same way as in Example 1, with one anti-detachment connecting line set along the warp direction.

[0042] (4) Edge sealing strip formation: Around the perimeter of the mesh, the ends of the warp and weft membrane fiber bundles at the edge knots are retained for 20mm and not immediately cut. During hot-press sealing, these end fiber bundles are folded back along the edge of the mesh and heated and pressurized together with the hot-press sealing layer at the edge knots. The heating temperature is 140℃, the pressing pressure is 2.5MPa, and the time is 6 seconds. After the surface layer of the end fiber bundles melts, it is fused with the hot-press sealing layer at the edge knots, and after cooling, a continuous edge sealing strip is formed. The edge sealing strip is approximately 0.3mm thick and approximately 8mm wide. A reinforcing sealing point is set every 5 knots on the edge sealing strip. At the reinforcing sealing point, the anti-detachment connecting line is folded back and wrapped around the edge knot three times before being pressed into the hot-press sealing layer.

[0043] (5) Cooling and curing are the same as in Example 1, with a tension of 0.3 MPa applied. Tests show that the mesh prepared in this example has a breaking strength of approximately 35% higher at the edge knots than the mesh without edge sealing strips, the mesh edges are less prone to detachment, and the overall dimensional stability is better. Example 4

[0044] This embodiment focuses on illustrating the specific structure of the edge sealing mold and its application in hot-press edge sealing and shaping.

[0045] The edge-sealing die consists of an upper die and a lower die. Both are made of stainless steel and have internally embedded electric heating elements with a power of 2kW. The temperature is controlled within the range of 120℃ to 160℃ by a thermostat. The lower surface of the upper die has multiple raised pressure heads, the shape of which matches the shape of the mesh. The ends of the pressure heads are hemispherical with a radius of 1.5mm. The upper surface of the lower die has grooves corresponding to the pressure heads, with a groove depth of 0.2mm to 0.5mm. The bottom of the groove has an elastic pad made of heat-resistant silicone rubber with a thickness of 1mm. On both sides of the grooves are relief grooves with a width of 2mm to 5mm and a depth of 1mm to 3mm.

[0046] In use, the mesh sheet with anti-slip knot locking and anti-detachment connecting lines is laid flat on the lower mold, so that each knot is embedded in the corresponding groove and the mesh feet fall into the relief groove. The upper mold moves downward, and the pressure head presses into the groove, applying pressure and heat to the knots and the 0.5mm to 5mm area at the root of the mesh feet on both sides of the knots. Due to the presence of the mesh foot relief groove, the fiber bundles in the middle of the mesh are not directly clamped by the pressure head and the groove, so complete melting does not occur. The heating temperature is 140℃, the pressure is 2.0MPa, and the heating and pressurizing time is 5 seconds. After hot pressing is completed, the upper mold is lifted, and the mesh sheet is transferred to the cooling zone.

[0047] This edge-sealing die enables precise localized hot-pressing of the mesh, preventing the fiber bundles in the middle of the mesh from losing strength due to excessive heating. Simultaneously, the hemispherical end of the press head creates a rounded transition on the outer surface of the hot-pressed edge-sealing layer, reducing stress concentration. Example 5

[0048] This embodiment provides a rectangular mesh twisted wire, and uses a large molecular weight range and a wide range of process parameters.

[0049] (1) Preparation of membrane splitting fiber: Select ultra-high molecular weight polyethylene film with a viscosity-average molecular weight of 4 million, and cut it into membrane splitting fiber bundles with a thickness of 80 μm and a width of 16 mm by a membrane splitting device, with a linear density of about 3500 tex.

[0050] (2) Twisting and weaving: Rectangular mesh is used, with half mesh size of 100mm×60mm. The initial twist is 70 twists per meter.

[0051] (3) Anti-slip knot locking treatment: At each knot, the warp and weft fiber bundles are split into two sub-fiber bundles. The two warp sub-fiber bundles are passed between the two weft sub-fiber bundles, then passed back in the opposite direction and twisted a second time. The twist direction of the second twist is opposite to that of the initial twist, and the twist is 100 twists per meter, which is about 42.8% higher than the initial knot twist. The ends of the sub-fiber bundles are folded back and pressed into the knot.

[0052] (4) Anti-loosening connecting line setting: Anti-loosening connecting lines are set along both the warp and weft directions of the mesh. The linear density of the anti-loosening connecting line is 800 tex, which is about 23% of the linear density of the main fiber bundle. The slack allowance is 3% of half the mesh size.

[0053] (5) Hot-press sealing and shaping: The heating temperature is 130℃, the pressure is 1.5MPa, and the heating and pressing time is 8 seconds. The thickness of the hot-press sealing layer is about 0.25mm.

[0054] (6) Cooling and curing: Natural cooling is adopted, and a tension of 0.4 MPa is applied during the cooling process. According to the test, the mesh obtained in this embodiment has a breaking strength at the mesh connection point that is about 50% higher than that of traditional twisted mesh, and the mesh size remains stable after long-term use without obvious deformation.

[0055] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A twisted net, comprising a net sheet woven from twisted bundles of ultra-high molecular weight polyethylene film-split fibers, the net sheet having warp film-split fiber bundles and weft film-split fiber bundles, the warp and weft film-split fiber bundles being twisted at intersections to form knots, and meshes being formed between adjacent knots; characterized in that, The mesh knot is provided with a mesh anti-slip edge sealing structure, which includes a mechanical locking unit, an anti-detachment connecting line, and a hot-pressed edge sealing layer. The mechanical locking unit is located at the intersection of the warp and weft slit fiber bundles. The warp and weft slit fiber bundles are split into at least two sub-fiber bundles at the intersection, and the sub-fiber bundles interweave and twist together again to form an irreversible mechanical interlocking connection. The anti-detachment connecting line extends along the mesh arrangement direction, passes through adjacent mesh knots in sequence, and is wrapped and fixed with the fiber bundles at the mesh knots. The linear density of the anti-detachment connecting line is less than the linear density of the main fiber bundles constituting the mesh. The hot-pressed edge sealing layer is formed by the surface layer of ultra-high molecular weight polyethylene fiber at the mesh knot and near the mesh root after being heated, melted and then re-cured. It covers the outside of the mechanical locking unit and connects the sub-fiber bundles, the anti-detachment connecting line, and the adjacent mesh root at the intersection into one unit.

2. The twisted wire mesh according to claim 1, characterized in that, In the mechanical locking unit, the warp and weft split fiber bundles are each split into 2 to 6 sub-fiber bundles. The split sub-fiber bundles first cross each other and then twist twice in the same or opposite direction as the original twisting direction. During the second twisting, at least one interlacing loop is formed between the warp and weft sub-fiber bundles. The twist of the interlacing loop is greater than the twist of the initial knot, and the ends of the sub-fiber bundles after the second twisting are folded back and pressed into the inside of the knot. The insertion method of the sub-fiber bundles includes dividing the warp sub-fiber bundles into upper and lower groups, allowing the weft sub-fiber bundles to pass between the upper and lower groups, and then exchanging the positions of the warp and weft sub-fiber bundles and passing them back in the opposite direction, thereby forming an irreversible mechanical interlock at the knot.

3. The twisted wire mesh according to claim 1, characterized in that, The anti-detachment connecting lines are arranged along the warp direction, weft direction, or both warp and weft directions. When arranged along both warp and weft directions, the warp anti-detachment connecting lines and the weft anti-detachment connecting lines cross and intertwine at the knots to form a crisscrossing anti-detachment network. The anti-detachment connecting lines are made of ultra-high molecular weight polyethylene film-split fiber lines with a viscosity-average molecular weight of 1 million to 6 million and a linear density of 20% to 80% of the linear density of the main fiber bundle. The anti-detachment connecting lines maintain a slack allowance between adjacent knots, and the slack allowance is 1% to 10% of half the mesh size.

4. The twisted net according to claim 1, characterized in that, The hot-pressed edge sealing layer covers the outer side of the mesh knot and the area at the root of the mesh knot on both sides, with a length of 0.5mm to 5mm. The thickness of the hot-pressed edge sealing layer is 0.05mm to 0.5mm. The hot-pressed edge sealing layer is formed by melting and solidifying the surface layer of ultra-high molecular weight polyethylene fiber, while retaining the core of the fiber bundle that is not completely melted inside. The outer surface of the hot-pressed edge sealing layer has a rounded transition and forms a smooth anti-slip edge sealing surface on the outer side of the mesh knot. The anti-slip edge sealing surface is fused and fixed to the part of the anti-detachment connecting line wrapped around the mesh knot.

5. The twisted wire mesh according to claim 1, characterized in that, The mesh shape of the mesh sheet is one or more of rhombus, square, and rectangular, and the half-mesh size is 20mm to 200mm; the viscosity-average molecular weight of the ultra-high molecular weight polyethylene film-split fiber bundle is 1 million to 6 million, the thickness is 20μm to 100μm, and the width is 6mm to 18mm; the linear density of the warp film-split fiber bundle and the weft film-split fiber bundle is the same or different, and the mesh anti-slip knot sealing structure is also provided at the mesh knot at the edge of the mesh sheet.

6. The twisted wire mesh according to claim 1, characterized in that, The periphery of the mesh is also provided with an edge sealing strip. The edge sealing strip is formed by hot-pressing and melting the ends of the meridional and latitudinal membrane fiber bundles at the edge of the mesh and then connecting them to the hot-pressed edge sealing layer at the edge knot. The edge sealing strip is arranged continuously or intermittently along the edge of the mesh. Reinforcing sealing points are also provided at intervals on the edge sealing strip. The anti-detachment connecting line at the reinforcing sealing point is folded back and wrapped and fixed with the edge knot.

7. The anti-slip knot sealing process for twisted mesh according to any one of claims 1 to 6, characterized in that, Includes the following steps: Step 1: Preparation of membrane-splitting fibers: Ultra-high molecular weight polyethylene film with a viscosity-average molecular weight of 1 million to 6 million is cut into membrane-splitting fiber bundles with a thickness of 20 μm to 100 μm and a width of 6 mm to 18 mm using a membrane splitting device. Step 2, Twisting and Weaving: The membrane split fiber bundles are fed into the twisting and weaving equipment as warp and weft fibers, and cross-twisting and weaving are performed to form a preliminary web at each intersection of the warp and weft fiber bundles; Step 3, anti-slip knot locking treatment: At each initial knot, the warp fiber bundle and the weft fiber bundle are separated into at least two sub-fiber bundles. The separated sub-fiber bundles are interlaced and then twisted back together to form a mechanically interlocked knot locking structure. Step 4: Setting up anti-detachment connecting lines: Set up at least one anti-detachment connecting line along the mesh arrangement direction, so that the anti-detachment connecting line passes through each mesh knot in sequence and is wrapped and fixed with the fiber bundle at the mesh knot; Step 5, Hot-press sealing and shaping: Apply heat and pressure to each knot that has been locked with anti-slip knots and the root of the knot near the knot, so that the surface layer of ultra-high molecular weight polyethylene fiber partially melts and then re-solidifies to form a hot-press sealing layer covering the outside of the knot. Step 6: Cooling and curing: Cool the hot-pressed edge-sealing mesh to fully cure the hot-pressed edge-sealing layer and obtain a mesh anti-slip edge-sealing structure.

8. The anti-slip sealing process for twisted mesh according to claim 7, characterized in that, In step three, the number of sub-fiber bundles split is 2 to 6 strands. During the splitting and interlacing, the warp fiber bundles are first divided into the first and second groups, and the weft fiber bundles are divided into the third and fourth groups. The first and third groups are crossed, and the second and fourth groups are crossed. Then, the crossed sub-fiber bundles are reversed and twisted a second time. The twist direction of the second twist is opposite to that of the initial knot, and the twist of the second twist is 10% to 60% higher than that of the initial knot. The anti-slip knot locking treatment is performed simultaneously on the knots at the edge of the mesh.

9. The anti-slip sealing process for twisted mesh according to claim 7, characterized in that, In step five, the heating temperature is 120℃ to 160℃, the pressure is 0.5MPa to 5.0MPa, and the heating and pressurizing time is 1 second to 10 seconds. The hot-pressing and sealing shaping adopts a sealing die. The sealing die has a groove that matches the shape of the mesh and a foot relief groove located on both sides of the groove. The sealing die only heats and presses the mesh and the area of ​​0.5mm to 5mm at the root of the foot on both sides of the mesh, so as not to completely melt the fiber bundle in the middle of the mesh.

10. The anti-slip sealing edge sealing process for twisted mesh according to claim 7, characterized in that, In step six, cooling and curing are carried out using natural cooling, air cooling, or water cooling. During the cooling process, a tension of 0.1MPa to 1.0MPa is applied to the mesh while maintaining the mesh size. After cooling and curing, the anti-detachment connecting wire is fused and fixed to the hot-pressed edge sealing layer. In step four, the anti-loosening connecting lines are set along the warp and weft directions of the mesh. When set along both the warp and weft directions, the warp anti-loosening connecting lines and the weft anti-loosening connecting lines cross and intertwine at the mesh knots to form an anti-loosening network.

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