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How to protect the fence
The durability of a fence is closely linked to the quality of its protective coating. According to a senior engineer, road fences typically have an expected lifespan of around 10 years. However, some small manufacturers enter the market by offering low-cost products, which often compromise on quality. These companies may use substandard materials and improper production methods, resulting in a shorter lifespan of only 3 to 4 years. Such products fail to meet long-term usage requirements. Therefore, we strongly advise our customers to choose reliable and professional manufacturers when purchasing railway barriers. Avoid being tempted by cheap but low-quality options, as they can lead to higher maintenance costs and safety risks in the long run.
Fence nets, also known as isolation fences, are structures made of metal mesh that are tightly attached to support frames. Their main purpose is to prevent people and animals from entering restricted areas such as roads or highways. These barriers are essential on both sides of highways and first-class expressways, helping to prevent unauthorized access and maintain traffic safety.
One common method for protecting fences is powder impregnation. In China, the most advanced technique currently used is the powder coating process, which originated from the fluidized bed method. Initially developed for applications like the Winkler gas generator, this method involved contact decomposition of oil and later evolved into a solid-gas two-phase contact process for metal coatings. It is sometimes referred to as the "fluidized bed coating method."
In this process, powdered coating material is placed in a porous and air-permeable container called a fluidizing tank. A blower then forces compressed air from below, causing the powder to become fluidized and evenly distributed. This creates a fine, uniform layer of powder, ensuring consistent coverage during the coating process.
The fluidized bed represents the second stage of solid flow, following the fixed bed stage. As the gas flow rate increases, the powder layer expands and becomes loosely packed. Each particle floats and moves slightly, creating a stable fluidized state. The BC segment illustrates this expansion, where the height of the powder layer increases with gas velocity, while the pressure within the bed remains constant. This unique characteristic allows for efficient and uniform coating without excessive energy consumption.
For powder coating applications, vertical fluidization is commonly used. The fluidization number must be determined through testing. Typically, the suspension rate of the powder in the fluidized bed can reach 30 to 50 percent. Railway isolation fences, municipal barriers, and dual-sided fencing are usually cleaned and preheated above the melting point of the powder before being immersed in the fluidized bed. This ensures even adhesion of the plastic powder, followed by polymer cross-linking to form a durable steel-plastic composite product.