Plastic formula and manufacturing process of novel steel-plastic composite protective net for coal mine

Abstract

The invention discloses a novel steel-plastic composite protective net plastic formula for a coal mine and a manufacturing process. The novel steel-plastic composite protective net plastic formula comprises PVC three-type resin, PVC elastomer, ground calcium carbonate, paraffin, dioctyl phthalate, aluminum hydroxide, magnesium hydroxide, nano calcium carbonate, halogen flame-retardant master batch, fatty acid barium, DOTP, nitrile rubber, antimony oxide, acrylate, CPEB, silicone rubber, stearic acid, PE wax, phthalocyanine blue and high-melting-point wax. According to the formula design, PVC resin and an elastomer are compounded, and the synergistic enhancement effect of heavy calcium carbonate and nano calcium carbonate is combined, so that a rigid-flexible matrix structure is formed; multiple flame-retardant and smoke-suppressing properties are realized; a flame-retardant system is synergistic; the endothermic decomposition effect of aluminum hydroxide and magnesium hydroxide is combined with a gas-phase flame-retardant mechanism of halogen flame-retardant master batch and antimony oxide;

Description

Technical Field

[0001] The invention relates to a steel-plastic composite protective net, in particular to a plastic formula and a manufacturing process for a new type of steel-plastic composite protective net for coal mines. Background Art

[0002] Coal mine support projects place extremely stringent demands on the performance of protective nets, which must simultaneously meet high strength, flame retardancy, antistatic properties, and corrosion resistance to cope with complex geological conditions, gas environments, and dynamic load impacts. Traditional protective nets are mainly divided into two categories: metal nets and ordinary plastic nets, but both have significant defects:

[0003] Metal protective mesh (such as galvanized steel wire mesh):

[0004] Poor corrosion resistance: The high humidity and acidic environment underground easily causes steel wire to rust, and its strength decreases year by year, with a service life of usually less than 3 years;

[0005] Safety hazards: Metal mesh is highly conductive and easily generates sparks due to friction, posing an explosion risk in gas-rich areas;

[0006] Heavy weight and complex installation: high transportation and laying costs, and sharp edges can easily injure people.

[0007] Ordinary plastic protective net:

[0008] Insufficient mechanical properties: The tensile strength of conventional polyolefins (such as PP, PE) or single PVC materials (usually ≤30MPa) is difficult to withstand the pressure of the top plate and is prone to brittle fracture;

[0009] Flame retardant performance does not meet the standard: Most plastic meshes rely on a single flame retardant (such as aluminum hydroxide), with a self-extinguishing time of more than 10 seconds, and molten droplets are prone to igniting gas at high temperatures;

[0010] Serious static electricity accumulation: When no antistatic agent is added, the surface resistance is > 1×10 12 Ω, static charge is easily accumulated during friction in coal seams, causing gas explosion;

[0011] Poor process stability: Imprecise extrusion temperature control leads to uneven coating thickness, low degree of automation of the netting machine, and a scrap rate of over 10%.

[0012] In recent years, some improved steel-plastic composite meshes have been improved by combining galvanized wire with plastic to improve corrosion resistance, but the following technical bottlenecks still exist:

[0013] Single formula design: Components such as toughening agents, flame retardants, and antistatic agents do not form a synergistic system, resulting in unbalanced performance (e.g., high flame retardancy at the expense of mechanical strength);

[0014] Extensive manufacturing process: large extrusion temperature fluctuations (±15°C), uneven cooling causing internal stress concentration, and inaccurate control of mesh tension leading to mesh deformation;

[0015] Lack of safety regulations: The production process lacks automated emergency stop devices and safe operating procedures, resulting in a high equipment failure rate and a significant risk of casualties.

[0016] Therefore, there is an urgent need to develop a new type of steel-plastic composite protective net. Through the scientific compounding of the formula components and the precise control of the manufacturing process, it can not only ensure high strength and high flame retardancy, but also solve the problems of antistatic, corrosion resistance and process safety, and achieve efficient and environmentally friendly industrial production. This invention proposes an innovative solution to the above technical pain points. Summary of the Invention

[0017] The technical problem to be solved by the present invention is to overcome the defects of the above-mentioned technology and provide a new type of steel-plastic composite protective net plastic formula and manufacturing process for coal mines.

[0018] In order to solve the above technical problems, the technical solution provided by the present invention is a new type of steel-plastic composite protective net plastic formula and manufacturing process for coal mines: composed of the following components in parts by weight:

[0019] 20-30 parts of PVC type III resin; 20-30 parts of PVC elastomer; 20-30 parts of heavy calcium carbonate; 10-15 parts of paraffin wax; 8-12 parts of dioctyl ester; 7-10 parts of aluminum hydroxide; 7-10 parts of magnesium hydroxide; 4-7 parts of nano-calcium carbonate; 2-5 parts of halogen flame retardant masterbatch; 2-5 parts of barium fatty acid; 2-5 parts of DOTP; 1-3 parts of nitrile rubber; 0.5-2 parts of antimony oxide; 0.5-2 parts of acrylate; 0.3-1 parts of CPE135B; 0.3-1 parts of silicone rubber; 0.2-0.6 parts of stearic acid; 0.2-0.6 parts of PE wax; 0.2-0.6 parts of phthalocyanine blue; 0.1-0.3 parts of high melting point wax.

[0020] As an improvement, the hydrogen and oxygen

[0021] The weight ratio of aluminum hydroxide to magnesium hydroxide is 1:1;

[0022] The weight ratio of the PVC resin to the PVC elastomer is 1:1.

[0023] As an improvement, the halogen flame retardant masterbatch is a brominated flame retardant, and the weight ratio of the halogen flame retardant to antimony oxide is (2-5):(0.5-2).

[0024] As an improvement, the silicone rubber is methyl vinyl silicone rubber, and the weight ratio of the silicone rubber to CPE135B is (0.3-1):(0.3-1).

[0025] As an improvement, the following steps are included:

[0026] Extrusion process: pass the galvanized wire through a special die, adjust the extrusion temperature to 170-180℃, and extrude continuously after the trial production is qualified;

[0027] After extrusion, the steel-plastic composite yarn is cooled in a cooling tank with the water temperature controlled at 30-35°C and then wound up;

[0028] Netting process: set the parameters of the netting machine, start automatic weaving, and trigger the emergency stop device in case of abnormality;

[0029] After trimming the pieces, the finished protective nets are classified and stacked.

[0030] As an improvement, in the extrusion process, the diameter of the galvanized wire is 2-5 mm, and the aperture tolerance of the special mold is ±0.1 mm.

[0031] As an improvement, the cooling tank adopts segmented water cooling, the water temperature gradient decreases in each segment, and the total temperature difference does not exceed 10°C.

[0032] As an improvement, the parameters of the netting machine include a mesh size of 50-100 mm, a weaving speed of 10-20 m / min, and a netting tension control of 50-100 N.

[0033] As an improvement, if the wire gets stuck during the meshing process, the emergency stop device must be locked first, and then manually reset before resuming production. The reset operation must be performed by a certified electrician.

[0034] As an improvement, the performance indicators of the finished protective net are:

[0035] Tensile strength ≥50MPa;

[0036] Flame retardant grade UL94V-0;

[0037] Surface resistance ≤1×10 9 Ω.

[0038] The advantages of the present invention compared with the existing technology are: 1. High strength and improved durability: Formula design: Through a 1:1 compounding of PVC resin and elastomer, combined with the synergistic reinforcement of heavy calcium carbonate and nano-calcium carbonate, a rigid and flexible matrix structure is formed, with a tensile strength ≥50MPa (measured 58MPa) and an elongation at break ≥200% (measured 220%), which are much higher than the industry standard (usually tensile strength ≤40MPa).

[0039] Optimization of interface bonding strength: Nitrile rubber is used as a binder to significantly improve the interface bonding strength between the plastic layer and the galvanized steel wire. After the salt spray test (5% NaCl, 720h), there is no delamination or peeling.

[0040] 2. Multiple flame retardancy and smoke suppression: The flame retardant system synergizes: The endothermic decomposition of aluminum hydroxide and magnesium hydroxide (1:1 ratio) is combined with the vapor-phase flame retardancy of the halogen flame retardant masterbatch and antimony oxide to form a "solid-gas" dual-phase flame retardant system. Vertical combustion self-extinguishing time is ≤ 5s (measured 4.2s), smoke density level is ≤ 50 (GB / T8627), and there is no droplet, meeting the strict flame retardancy requirements of underground coal mines (UL94V-0).

[0041] High temperature stability: The stabilizer combination of barium fatty acid and paraffin inhibits the degradation of PVC at high extrusion temperatures (180°C) and reduces scorch and bubble defects.

[0042] 3. Anti-static and safety assurance:

[0043] Antistatic agent function: Add methyl vinyl silicone rubber (CH150) to make the surface resistance of the protective net ≤1×10 9 Ω(measured 3.5×10 8 Ω), effectively avoiding the risk of explosion caused by static electricity accumulation in the gas environment of coal mines.

[0044] Wear-resistant and anti-slip: The synergistic effect of PE wax and nitrile rubber reduces the friction loss between the steel wire and the plastic layer, extending the service life (measured underground life ≥ 5 years).

[0045] 4. Process stability and production efficiency optimization:

[0046] Extrusion process control: precise temperature zone control (±5°C), combined with segmented cooling tanks (total temperature difference ≤10°C), ensures uniform crystallization of the plastic layer and a diameter tolerance of ≤±0.2mm;

[0047] Adopt constant tension winding (20-50N), coil density ≥0.85g / cm 3 , reducing the wire breakage rate in subsequent netting (≤0.5%).

[0048] Netting automation: PLC-controlled netting machine achieves a mesh size tolerance of ±2mm and a weaving speed of 15m / min, which is 300% more efficient than traditional manual weaving.

[0049] The emergency stop device is linked to the limit switch, and the abnormal response time is ≤1s, reducing the scrap rate caused by equipment failure (≤2%). DETAILED DESCRIPTION

[0050] To facilitate understanding of the present application, a more comprehensive description of the present application will be given below.

[0051] The plastic formula and manufacturing process of the new steel-plastic composite protective net for coal mines: It is composed of the following components in parts by weight:

[0052] 20-30 parts of PVC type III resin; 20-30 parts of PVC elastomer; 20-30 parts of heavy calcium carbonate; 10-15 parts of paraffin wax; 8-12 parts of dioctyl ester; 7-10 parts of aluminum hydroxide; 7-10 parts of magnesium hydroxide; 4-7 parts of nano-calcium carbonate; 2-5 parts of halogen flame retardant masterbatch; 2-5 parts of barium fatty acid; 2-5 parts of DOTP; 1-3 parts of nitrile rubber; 0.5-2 parts of antimony oxide; 0.5-2 parts of acrylate; 0.3-1 parts of CPE135B; 0.3-1 parts of silicone rubber; 0.2-0.6 parts of stearic acid; 0.2-0.6 parts of PE wax; 0.2-0.6 parts of phthalocyanine blue; 0.1-0.3 parts of high melting point wax.

[0053] As an improvement, the hydrogen and oxygen

[0054] The weight ratio of aluminum hydroxide to magnesium hydroxide is 1:1;

[0055] The weight ratio of the PVC resin to the PVC elastomer is 1:1.

[0056] As an improvement, the halogen flame retardant masterbatch is a brominated flame retardant, and the weight ratio of the halogen flame retardant to antimony oxide is (2-5):(0.5-2).

[0057] As an improvement, the silicone rubber is methyl vinyl silicone rubber, and the weight ratio of the silicone rubber to CPE135B is (0.3-1):(0.3-1).

[0058] As an improvement, the following steps are included:

[0059] Extrusion process: pass the galvanized wire through a special die, adjust the extrusion temperature to 170-180℃, and extrude continuously after the trial production is qualified;

[0060] After extrusion, the steel-plastic composite yarn is cooled in a cooling tank with the water temperature controlled at 30-35°C and then wound up;

[0061] Netting process: set the parameters of the netting machine, start automatic weaving, and trigger the emergency stop device in case of abnormality;

[0062] After trimming the pieces, the finished protective nets are classified and stacked.

[0063] As an improvement, in the extrusion process, the diameter of the galvanized wire is 2-5 mm, and the aperture tolerance of the special mold is ±0.1 mm.

[0064] As an improvement, the cooling tank adopts segmented water cooling, the water temperature gradient decreases in each segment, and the total temperature difference does not exceed 10°C.

[0065] As an improvement, the parameters of the netting machine include a mesh size of 50-100 mm, a weaving speed of 10-20 m / min, and a netting tension control of 50-100 N.

[0066] As an improvement, if the wire gets stuck during the meshing process, the emergency stop device must be locked first, and then manually reset before resuming production. The reset operation must be performed by a certified electrician.

[0067] As an improvement, the performance indicators of the finished protective net are:

[0068] Tensile strength ≥50MPa;

[0069] Flame retardant grade UL94V-0;

[0070] Surface resistance ≤1×10 9 Ω.

[0071] 1. Specific implementation of plastic formula:

[0072] Formula composition and function description:

[0073] The plastic formulation of the present invention is composed of the following components in synergistic effect by weight (taking a total weight of 100 kg as an example):

[0074]

[0075]

[0076] Formula preparation process (Example 1): Step 1: Raw material pretreatment:

[0077] Dry Sichuan heavy calcium carbonate and Jiangxi nano calcium carbonate at 120℃ for 2 hours, with a moisture content of ≤0.3%;

[0078] Halogen flame retardant masterbatch and antimony oxide should be passed through a 200-mesh sieve to prevent agglomeration.

[0079] Step 2: High Speed ​​Blending:

[0080] Add PVC resin, PVC elastomer and dried calcium carbonate into a high-speed mixer (speed 800r / min) and premix for 3 minutes;

[0081] Add liquid components (dioctyl acrylate, DOTP, paraffin) and flame retardants (aluminum hydroxide, magnesium hydroxide, halogen masterbatch, antimony oxide), increase the speed to 1000 r / min, and mix for 10 minutes until the material temperature reaches 80°C;

[0082] Add the remaining components (nitrile rubber, acrylate, CPE135B, silicone rubber, stearic acid, PE wax, phthalocyanine blue, high melting point wax), reduce the speed to 600 r / min, mix for 5 minutes and then discharge the material. The material temperature is ≤50°C.

[0083] Step 3: Cooling and maturation:

[0084] The mixed materials were transferred to a cold mixer, cooled to room temperature (25°C), sealed and aged for 24 hours to allow the plasticizer to fully penetrate.

[0085] 2. Specific implementation of manufacturing process:

[0086] (1) Extrusion process:

[0087] Device configuration:

[0088] Extruder: single screw extruder (screw length-diameter ratio 25:1, compression ratio 3:1);

[0089] Mould: Special steel-plastic composite protective net mould (mould aperture 6.0±0.1mm);

[0090] Cooling tank: Segmented water cooling tank (total length 12m, divided into 4 sections, each section 3m), equipped with PID temperature control system.

[0091] Operation process:

[0092] Step 1: Galvanized wire pretreatment: galvanized low carbon steel wire (diameter 3mm, zinc layer thickness ≥80g / m 2 ) Straightened by a straightening machine, with no burrs or oxide layers on the surface;

[0093] The straightened steel wire is coiled onto the discharge rack with the tension controlled at 10-15N to prevent twisting.

[0094] Step 2: Extrusion parameter settings:

[0095] Extruder temperature zone control (unit: ℃):

[0096]

[0097] Step 3: Trial production and adjustment:

[0098] Start the extruder and let it idle for 5 minutes to preheat;

[0099] Lead the steel wire through the die, start the traction device, and observe the uniformity of the extruded coating;

[0100] Take samples to measure the diameter of the steel-plastic wire (target value 6.2±0.2mm) and adjust the pulling speed to within the tolerance range.

[0101] Step 4: Continuous production and cooling:

[0102] Turn on the cooling water pump and control the water temperature in the cooling tank in sections:

[0103]

[0104] Step 5: Rolling up:

[0105] The take-up reel adopts constant tension control (20-50N), and the reel density is ≥0.85g / cm 3 , without looseness or overlapping lines.

[0106] (2) Netting process:

[0107] Device configuration:

[0108] Fully automatic netting machine (PLC control, touch screen human-machine interface);

[0109] Shear knife module (pneumatic drive, shear force ≥ 500N);

[0110] Tension sensor (range 0-200N, accuracy ±1%).

[0111] Operation process:

[0112] Step 1: Parameter initialization:

[0113] After power on, enter the operation interface and set the following parameters:

[0114]

[0115] Step 2: Automatic Knitting:

[0116] The steel-plastic composite yarn is transported to the weaving module via a guide wheel, and the weft crossing angle is 90±2°;

[0117] Real-time monitoring of tension fluctuations, automatic alarm when the deviation exceeds ±10N;

[0118] The shear knife action time is ≤0.5 seconds and the cut flatness is ≤1mm.

[0119] Step 3: Exception handling:

[0120] Thread stuck: After the limit switch is triggered, immediately press the emergency stop button and lock it. Have an electrician use a special tool (such as a nylon hook) to straighten the thread. After resetting, manually click the "Reset-Start" process;

[0121] Lock deviation: After slicing, manual trimming is performed using a special U-shaped clip (tolerance ±0.5mm) to correct the lock position. Adjustment is prohibited while the equipment is running.

[0122] Step 4: Finished product processing:

[0123] The protective nets are classified by size (2×5m, 3×10m, etc.), stacked vertically on moisture-proof pallets, and separated by PE film between layers;

[0124] Sampling test (5% of each batch):

[0125] Tensile strength: universal testing machine (ASTMD638), ≥50MPa;

[0126] Flame retardance: Vertical burning test (GB / T2408), self-extinguishing time ≤5s, no melt drops;

[0127] Antistatic: Surface resistance tester (GB / T1410), ≤1×10 9 Ω.

[0128] III. Safety production specification (core clauses)

[0129] Personnel training:

[0130] The operator needs to pass the "theory + practice" examination, be familiar with the emergency stop button, limit switch position and reset process;

[0131] Maintenance personnel hold electrician certificate / mechanical maintenance certificate, safety drill once every quarter.

[0132] Equipment maintenance:

[0133] Check the insulation resistance of the heating ring of the extruder ≥5MΩ every day;

[0134] Clean the carbon deposition of the mold every week (special copper brush), and apply high temperature lubricating grease (temperature resistance ≥300℃).

[0135] Emergency treatment:

[0136] Extruder abnormal temperature rise (>185℃): immediately stop, start standby cooling fan;

[0137] Netting machine shear stuck: close the pneumatic valve, use the tool puller to manually reset.

[0138] IV. Technical effect verification:

[0139] The performance of the protective net prepared by Example 1 is as follows:

[0140]

[0141] The coal mine new type steel-plastic composite protective net plastic formula and manufacturing process of the application solves the problems of insufficient strength, poor flame retardance, easy to produce static electricity and weak corrosion resistance of traditional protective nets in the application of coal mine underground, and has the following specific beneficial effects:

[0142] 1. High strength and durability improvement: formula design: through 1:1 compounding of PVC resin and elastomer, combined with the synergistic effect of heavy calcium carbonate and nano calcium carbonate, a rigid-flexible matrix structure is formed, the tensile strength ≥50MPa (measured 58MPa), the elongation at break ≥200% (measured 220%), which is much higher than the industry standard (usually tensile strength ≤40MPa).

[0143] Optimization of interface bonding strength: Nitrile rubber is used as a binder to significantly improve the interface bonding strength between the plastic layer and the galvanized steel wire. After the salt spray test (5% NaCl, 720h), there is no delamination or peeling.

[0144] 2. Multiple flame retardancy and smoke suppression: The flame retardant system synergizes: The endothermic decomposition of aluminum hydroxide and magnesium hydroxide (1:1 ratio) is combined with the vapor-phase flame retardancy of the halogen flame retardant masterbatch and antimony oxide to form a "solid-gas" dual-phase flame retardant system. Vertical combustion self-extinguishing time is ≤ 5s (measured 4.2s), smoke density level is ≤ 50 (GB / T8627), and there is no droplet, meeting the strict flame retardancy requirements of underground coal mines (UL94V-0).

[0145] High temperature stability: The stabilizer combination of barium fatty acid and paraffin inhibits the degradation of PVC at high extrusion temperatures (180°C) and reduces scorch and bubble defects.

[0146] 3. Anti-static and safety assurance:

[0147] Antistatic agent function: Add methyl vinyl silicone rubber (CH150) to make the surface resistance of the protective net ≤1×10 9 Ω(measured 3.5×10 8 Ω), effectively avoiding the risk of explosion caused by static electricity accumulation in the gas environment of coal mines.

[0148] Wear-resistant and anti-slip: The synergistic effect of PE wax and nitrile rubber reduces the friction loss between the steel wire and the plastic layer, extending the service life (measured underground life ≥ 5 years).

[0149] 4. Process stability and production efficiency optimization:

[0150] Extrusion process control: precise temperature zone control (±5°C), combined with segmented cooling tanks (total temperature difference ≤10°C), ensures uniform crystallization of the plastic layer and a diameter tolerance of ≤±0.2mm;

[0151] Adopt constant tension winding (20-50N), coil density ≥0.85g / cm 3 , reducing the wire breakage rate in subsequent netting (≤0.5%).

[0152] Netting automation: PLC-controlled netting machine achieves a mesh size tolerance of ±2mm and a weaving speed of 15m / min, which is 300% more efficient than traditional manual weaving.

[0153] The emergency stop device is linked to the limit switch, and the abnormal response time is ≤1s, reducing the scrap rate caused by equipment failure (≤2%).

[0154] 5. Environmental protection and cost advantages: Halogen-free flame retardant options: By adjusting the ratio of aluminum hydroxide to magnesium (up to 20%), it can replace some halogen flame retardants and meet EU RoHS environmental protection requirements;

[0155] Optimization of raw material costs: Nano calcium carbonate is compounded with ground calcium carbonate to reduce filler costs while ensuring strength (the overall cost is reduced by 30% compared to the pure nano filler solution).

[0156] 6. Safety operation standardization:

[0157] Production safety: Multiple safety locks (such as emergency stop buttons and shear knife guards) are set up in the weaving process, combined with the operating specifications of certified electricians, to reduce the rate of work-related accidents by more than 90%;

[0158] The equipment is easy to maintain: the carbon deposits on the mold can be cleaned online (copper brush + grease), and the daily maintenance time of the extruder is ≤30 minutes.

[0159] 7. Application scenario expansion:

[0160] This protective net can adapt to the underground conditions of coal mines with high humidity (relative humidity ≥95%), acidic environment (pH3-11) and dynamic load (impact energy ≥50J), and can also be expanded to tunnel engineering, slope protection and other fields.

[0161] Through formula innovation and process innovation, the present invention achieves the composite properties of high strength, high flame retardancy, antistatic and corrosion resistance of the protective net, while taking into account production efficiency and safety, providing a reliable technical solution for underground coal mine support projects.

[0162] The present invention and its embodiments are described above, but this description is not restrictive.

Claims

1. A new type of steel-plastic composite protective net plastic formula for coal mines, characterized in that: It is composed of the following components in parts by weight: 20-30 parts of PVC type III resin; 20-30 parts of PVC elastomer; 20-30 parts of heavy calcium carbonate; 10-15 parts of paraffin wax; 8-12 parts of dioctyl ester; 7-10 parts of aluminum hydroxide; 7-10 parts of magnesium hydroxide; 4-7 parts of nano-calcium carbonate; 2-5 parts of halogen flame retardant masterbatch; 2-5 parts of barium fatty acid; 2-5 parts of DOTP; 1-3 parts of nitrile rubber; 0.5-2 parts of antimony oxide; 0.5-2 parts of acrylate; 0.3-1 parts of CPE135B; 0.3-1 parts of silicone rubber; 0.2-0.6 parts of stearic acid; 0.2-0.6 parts of PE wax; 0.2-0.6 parts of phthalocyanine blue; 0.1-0.3 parts of high melting point wax.

2. The plastic formulation according to claim 1, characterized in that: The hydrogen and oxygen The weight ratio of aluminum hydroxide to magnesium hydroxide is 1:1; The weight ratio of the PVC resin to the PVC elastomer is 1:

1.

3. The plastic formulation according to claim 1, characterized in that: The halogen flame retardant masterbatch is a brominated flame retardant, and the weight ratio of the halogen flame retardant to antimony oxide is (2-5):(0.5-2).

4. The plastic formulation according to claim 1, characterized in that: The silicone rubber is methyl vinyl silicone rubber, and the weight ratio of the silicone rubber to CPE135B is (0.3-1):(0.3-1).

5. A manufacturing process for a new type of steel-plastic composite protective net for coal mines, based on the formula described in any one of claims 1 to 4, characterized in that: The following steps are involved: Extrusion process: pass the galvanized wire through a special die, adjust the extrusion temperature to 170-180℃, and extrude continuously after the trial production is qualified; After extrusion, the steel-plastic composite yarn is cooled in a cooling tank with the water temperature controlled at 30-35°C and then wound up; Netting process: set the parameters of the netting machine, start automatic weaving, and trigger the emergency stop device in case of abnormality; After trimming the pieces, the finished protective nets are classified and stacked.

6. The manufacturing process according to claim 5, characterized in that: In the extrusion process, the diameter of the galvanized wire is 2-5 mm, and the aperture tolerance of the special mold is ±0.1 mm.

7. The manufacturing process according to claim 5, characterized in that: The cooling tank adopts segmented water cooling, and the water temperature gradient of each segment decreases, and the total temperature difference does not exceed 10°C.

8. The manufacturing process according to claim 5, characterized in that: The parameters of the netting machine include a mesh size of 50-100 mm, a weaving speed of 10-20 m / min, and a netting tension control of 50-100 N.

9. The manufacturing process according to claim 5, characterized in that: If the wire gets stuck during the weaving process, the emergency stop device must be locked first, and then manually reset before resuming production. The reset operation must be performed by a certified electrician.

10. The manufacturing process according to claim 5, characterized in that: The performance indicators of the finished protective net are: Tensile strength ≥50MPa; Flame retardant grade UL94V-0; Surface resistance ≤1×10 9 Ω.

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