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How to protect the fence
The connection between the protection of the fence network and its service life is significant. According to a senior engineer, the typical lifespan of road barriers is around 10 years. However, many small manufacturers with limited production scale are flooding the market with low-cost products. To cut costs, they often use inferior materials and poor manufacturing techniques, resulting in a much shorter lifespan—only 3 to 4 years. These substandard products fail to meet the necessary durability requirements. Therefore, we strongly advise our customers: when purchasing railway barriers, it's essential to choose a reputable and professional manufacturer. Avoid being tempted by cheaper options that may compromise safety and performance.
Fence nets, also known as isolation fences, are designed to be tightly attached to support structures using metal mesh sheets. Their primary purpose is to prevent unauthorized access by people or animals into restricted road areas. Separation barriers are typically installed on both sides of highways and first-class automobile roads to prevent illegal encroachment and ensure traffic safety.
One common method of protecting fences is through powder impregnation. In China, the most advanced technique currently used is the powder coating method, which originated from the fluidized bed process. 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 coating. It is sometimes referred to as the "fluidized bed coating method."
The process involves placing powder coating material into a porous, air-permeable container called a fluidizing tank. A blower then introduces compressed air from below, causing the powder to flow and become evenly distributed in a fine, suspended state. This ensures a uniform coating layer during application.
In terms of fluid dynamics, the fluidized bed represents the second stage of solid flow, following the fixed bed stage. As the gas velocity increases beyond a certain threshold, the bed expands, and the particles begin to float and move freely, entering the fluidized state. The BC segment in the graph illustrates the expansion of the powder layer within the fluidized bed. While the height of the bed increases with gas velocity, the pressure within the bed remains relatively constant. This stability allows for efficient and consistent coating.
The key to achieving an even coating lies in maintaining a uniform fluidized state of the powder. The fluidized bed used for powder coating is typically vertical, and the fluidization number must be determined through testing. Under optimal conditions, the suspension rate of the powder can reach up to 30–50%. For railway isolation fences, municipal barriers, and other similar structures, the surfaces are usually deoiled and preheated above the melting point of the powder coating. Once immersed in the fluidized bed, the powder adheres evenly, and after plasticization, it forms a durable, cross-linked polymer layer, creating a strong steel-plastic composite product.