Fence net is a metal product widely used in security, isolation, partitioning, and decoration. The standardization and technicality of its production process directly impacts the quality and service life of the product. This article systematically explains the complete production process for fence nets, from raw materials to finished product, covering key process steps and technical points.
Ⅰ. Raw Material Preparation
The main raw materials for fence nets are low-carbon steel wire, stainless steel wire, or galvanized steel wire. Depending on the application scenario, some products also require aluminum alloy or plastic coating. Raw material procurement must comply with national standards. Mechanical properties such as tensile strength and elongation must meet industry requirements. Upon arrival, the raw materials must be cleaned to remove impurities such as oil and rust to ensure quality in subsequent processing.
Ⅱ. Wire Straightening and Cutting
Raw materials are typically supplied in coils and require straightening on a straightening machine to eliminate curling stress and ensure wire straightness. After straightening, the wire is precisely cut to the desired length using a CNC cutting machine according to design specifications. Common lengths range from 1 to 3 meters, with an error tolerance of ±2 mm. During this process, the flatness of the cut surface must be strictly controlled to avoid burrs that could affect subsequent welding or weaving processes.
Ⅲ. Weaving or Welding
Fence mesh production processes fall into two categories: weaving and welding. The specific choice depends on the product type and application requirements.
1. Welding Process
The welding method is suitable for structures such as diamond mesh and square mesh. The intersections are fixed using a resistance welder or a CO2 shielded welder. Welding parameters (such as current, voltage, and speed) must be precisely adjusted to ensure a secure weld without cold or leaky welds. After welding, the weld seam is polished to remove burrs and spatter and improve surface smoothness.
2. Weaving Process
The weaving method is commonly used for flexible fencing meshes such as chain link fences and hexagonal wire mesh. Automated weaving machines weave the wires into a specific pattern. Controlling the weave density and tension is crucial. The mesh size (e.g., 50mm×50mm to 200mm×200mm) and wire spacing must be adjusted according to the intended use to ensure a stable and aesthetically pleasing structure.
IV. Surface Treatment
Surface treatment is essential to enhance the corrosion and weather resistance of fence mesh. Common processes include:
1. Hot-Dip Galvanizing
The welded or woven mesh is immersed in molten zinc (approximately 450°C–480°C) to form a protective zinc-iron alloy layer with a thickness of 50–100 microns, suitable for outdoor use in highly corrosive environments.
2. Cold Galvanizing (Electrogalvanizing)
A thin layer of zinc (approximately 5–15 microns thick) is applied to the steel wire surface via electrolytic deposition. This method is relatively low-cost but offers limited durability, and is primarily used for indoor or short-term use.
3. Plastic Spraying or Dipping
Plastic powder (such as PE or PVC) is sprayed or dipped onto a metal substrate. After high-temperature curing, a wear-resistant and UV-resistant coating is formed. Colors can be customized. This coating is widely used in areas such as landscaping and traffic barriers.
V. Quality Inspection and Packaging
Finished products undergo rigorous quality testing, including mesh size deviation, tensile strength testing, and coating adhesion testing. Qualified products are packaged according to specifications, typically wrapped in moisture-proof paper and plastic film before being secured in bundles. Product specifications and production batch information are marked on the outer boxes to ensure integrity during transportation and storage.
Conclusion
The production process of fence nets integrates materials science, machining, and surface treatment technologies. Each step requires precise control to ensure the reliability of the final product. With increasing environmental protection requirements and the application of new materials, fence net production processes will continue to develop towards higher efficiency and greener processes to meet diverse market demands.