What is a Mining grid? Application scenarios and selection guidelines for different tension levels of Mining grid

Mining grid, officially known as “Polyester Fiber Reinforced Plastic Grid Roof for Underground Coal Mines”, is a new type of composite material made from high modulus and high strength polyester filament as the base material. It is woven into a net and coated with a flame-retardant and anti-static coating on the surface.

It not only possesses high strength, lightweight, corrosion resistance, anti-static, and flame-retardant properties, but also demonstrates far superior durability and safety in underground humid and acidic/alkaline environments compared to metal nets.

The mining net is based on “tension strength” as its core technical indicator. Common specifications include: 50-50KN Mining Grid
100-80KN Mining Grid
200-200KN Mining Grid
300-300KN Mining Grid
400-400KN Mining Grid
600-400KN Mining Grid
Up to 1000KN
Among them, the numbers represent the minimum tensile strength that the mesh can withstand in different directions (unit: kilonewtons), and they are the most important reference for selection.

50-100KN level: Suitable for lightweight support scenarios
Application scenarios: Support the sides of small-section tunnels, temporary support, auxiliary protection for the excavation working face
Features: Lightweight and easy to install, suitable for manual operation, low cost
200-300KN level: Moderate support strength, the widest application range
Application scenarios: False roof support in comprehensive mining face, end support at the machine tail, along-the-coal seam mining
Features: Combines strength and flexibility, highly adaptable, high construction efficiency

• 400-600KN level: High-strength support, suitable for complex geological conditions

Application scenarios: Final coal mining face net laying, relocation and withdrawal of the working face, roof fracture zone, fault area
Features: Strong anti-tear ability, fast withdrawal speed, extremely high safety

• Above 600KN: Ultra-high strength, specially designed for special working conditions

Application scenarios: Large mining height working face, mining areas with extremely high roof pressure, permanent support of underground tunnels
Features: Can replace multiple layers of metal nets, overall laying efficiency increased by more than 50%

1. Flame-retardant and anti-static properties
   The surface of the Mining Grid is coated with a flame-retardant and anti-static coating, which complies with the safety access standards for coal mines underground. Compared with traditional metal nets, friction does not easily generate static electricity, eliminating the risk of gas explosion caused by static electricity.
2. Resistance to acid and alkali corrosion
   The underground environment is humid, containing sulfides, acidic water, etc., which are corrosive media. Metal nets corrode severely within 3-6 months of being buried underground, and their tensile strength decreases by 30%-50%; while the Mining Grid maintains its burial performance basically unchanged, and its service life is extended by more than three times.
3. Good flexibility and easy installation
   The unit weight of the Mining Grid is only 1/5 of that of metal nets. The weight of a single roll can be controlled within 16 tons (for mechanical transportation), and workers do not need high-intensity physical labor. The laying efficiency is increased by 2-4 times.
4. Good integrity and excellent?-stopping effect
   The Mining Grid can be customized with large-area integral net sheets (maximum width 21 meters). The working face can be laid with one sheet at once, without the need for repeated connection in front of the support, eliminating the phenomena of missing and spilling?, and the withdrawal speed is more than 1 times faster than that of metal nets.

The Mining grid is not merely a change in materials, but also represents an upgrade in the coal mine support technology. With its comprehensive advantages such as high strength, lightweight, easy construction, and long lifespan, it is becoming an important component for the safe production of modern mines.

Whether it is for a new working face or the renovation of an old mine, choosing the right mining net is equivalent to choosing the dual guarantees of safety and efficiency.

If you are looking for a high-strength, corrosion-resistant, and easy-to-install Mining grid product for the underground support engineering of coal mines, please contact EarthShield Geosynthetics. We specialize in the research and production of high-strength polyester fiber Mining grid, with products covering a full range of tension grades from 50KN to 1000KN, capable of meeting various working conditions such as comprehensive mining faces, relocation and withdrawal faces, along-the-coal seam mining, pillar protection, and roof and side wall protection.