What Are the Special Requirements for Fiberglass Mesh Laying in Double-Curved GRC Panels?

The laying of glass fibre mesh in double-curved GRC panels is a key process for ensuring their mechanical properties, especially crack resistance and toughness. Compared with flat panels or single-curved panels, the geometric complexity of double-curved surfaces imposes three special process requirements on glass fibre laying: "directional adaptation, wrinkle prevention, and thickness retention". Through large-scale double-curved GRC projects such as Poly Peninsula No.1 in Hainan, Qinglong Group has developed a mature quality control system for glass fibre laying.

The core difficulty of laying glass fibre on double-curved surfaces lies in avoiding wrinkles and ensuring fibre orientation. Laying standard glass fibre mesh directly on a double-curved surface can easily produce wrinkles that cannot be flattened, caused by variations in the surface's Gaussian curvature. These wrinkles result in uneven GRC layer thickness, creating weak points in strength. Qinglong's solution is a "cut-and-splice" strategy: based on the surface development drawing, the whole glass fibre mesh is reasonably divided into several pieces so that each piece fits the curved surface well, and during laying the overlap width (usually 50-100mm) is maintained to ensure fibre continuity. At the same time, fibre orientation is strictly controlled so that the fibres are distributed along principal stress trajectories, maximizing reinforcement efficiency.

Reinforcement treatment of special areas is another important step. Stress tends to concentrate at the edges of double-curved surfaces, around openings, and in areas where curvature changes sharply. Qinglong's process requires adding an extra layer of glass fibre mesh in these areas, or using a heavier reinforcement-grade mesh. For curled edge areas with a very small radius of curvature (R<300mm), where conventional mesh is difficult to bend and fit, we instead use chopped fibre spraying or embedded microfibres for local reinforcement. This differentiated reinforcement strategy ensures balanced and reliable mechanical properties across all parts of the double-curved GRC panel.

Matching the laying process with the forming method is also crucial. Depending on the complexity of the component's curvature, Qinglong chooses between the slurry flow method or the spray method. For double-curved surfaces with gentle curvature variation, the slurry flow method can be used, laying the glass fibre mesh first and then pouring the slurry. For extremely complex surfaces, the direct spray method is adopted, allowing fibre and slurry to cover the mould surface uniformly at the same time, which better ensures uniform fibre distribution on complex curved surfaces and avoids the dry fibre problem. Every process step is carried out by strictly trained technicians, ensuring that Qinglong's double-curved GRC panels combine artistic appeal with structural safety.