The role of the number of fiber layers in the grid structure

The molded fiberglass mesh is formed by laying continuous glass fiber yarns in a crisscross pattern to create a load-bearing framework. The number of fiber layers directly determines the glass fiber content, cross-sectional stiffness and ultimate bearing capacity, and is the core indicator for distinguishing the quality of the same thickness mesh.

Enhance bending stiffness and reduce deflection

The fibers are the main load-bearing components of the grid. Under the same thickness, when the number of fiber layers is sufficient, the internal distribution of glass fibers in the reinforcing bars is uniform, and the moment of inertia of the cross-section is greater, and the elastic modulus is higher. When subjected to load, the deformation is smaller; if the number of layers is insufficient, the resin content is too high, and the grid is prone to significant deflection under load. In engineering, most conditions control the maximum load-bearing capacity, and insufficient layers will directly lead to a significant decrease in the allowable load capacity.

Increase ultimate load-bearing capacity and fracture resistance

Increasing the number of layers means an increase in the effective cross-sectional area of glass fibers under load, and the bending strength and concentrated load tolerance simultaneously increase. A too small number of layers causes the reinforcing bars to crack and local fragmentation when under load; sufficient layers can disperse stress, delay crack propagation, and enhance the tolerance to impact loads. The market's conventional reference standard: for a 25-millimeter grid, half a layer of fibers is laid in standard thickness, and for a 38-millimeter grid, eight layers of fibers are laid in standard thickness.

Ensure structural uniformity and reduce internal defects

With a fixed thickness of reinforcing bars, when the number of fiber layers is sufficient, the yarns can be evenly arranged up and down, and there will be no local resin accumulation. If the number of layers is too small, the distance between two layers of fibers is too large, and the resin layer is too thick, which is prone to bubbles, delamination, and detachment. Under long-term load or temperature difference conditions, the surface layer may fall off and the internal part may become hollow.

Affect the balance of bidirectional load

The molded grid is laid with fibers alternately in the longitudinal and transverse directions to achieve bidirectional load-bearing. If the number of fiber layers in a certain direction is reduced, the strength of that direction is significantly weakened, and the grid no longer has bidirectional symmetry. After cutting and opening holes, it is more prone to damage.