What Are the Production Challenges of Perforated GRC Decorative Panels?

The production difficulties of hollow-out GRC decorative panels are concentrated in three core areas: “mold design and manufacturing, slurry forming control, and structural stability assurance.” The higher the hollow-out ratio and the more complex the shape, the greater the production difficulty. Qinglong has overcome many challenges through technologies such as five-axis CNC machining and high-pressure vibration molding. Projects such as the Nanning Liyuan Hotel and Sanya Festival Plaza maintain stable quality with hollow-out ratios exceeding 50%.

I. Mold Design and Manufacturing: Precise Adaptation to Hollow-Out Shapes

The mold is the core difficulty in hollow-out forming. Shape replication: complex hollow-out patterns (such as carvings and curved hollow-outs) require precise replication, and molds must have high strength and high precision; Qinglong uses five-axis CNC machined GRP molds with shape replication errors of ≤±0.5mm. Mold support design: hollow-out areas lack slurry support and easily cause mold deformation, requiring densely arranged reinforcing ribs (spacing ≤300mm); Qinglong mold reinforcing ribs are made of square steel, increasing stiffness by 40%. Demolding difficulty: the slurry in hollow-out areas has a large contact surface with the mold and easily sticks, requiring an optimized demolding angle (≥15°) and application of a special release agent; Qinglong uses a water-based environmentally friendly release agent, achieving a demolding success rate of 99.8%.

II. Slurry Forming Control: Avoiding Defects in Hollow-Out Areas

Slurry forming directly affects the quality of hollow-out panels. Slurry fluidity control: when hollow-out gaps are narrow (≤10mm), the slurry needs high fluidity (slump 220-250mm) while avoiding bleeding; Qinglong optimizes the water-cement ratio to 0.38-0.42 by adding high-efficiency water reducers, meeting fluidity standards. Air bubble removal: hollow-out areas easily trap air bubbles, forming honeycombed and pitted surfaces, requiring high-pressure vibration (pressure ≥0.5MPa) + vacuum degassing processes; Qinglong achieves a bubble removal rate of 95% with no obvious bubbles on the surface. Uniform fiber distribution: fiber agglomeration or absence easily occurs at hollow-out edges, resulting in insufficient strength; Qinglong uses two-axis forced mixing, achieving 98% fiber distribution uniformity and edge crack resistance strength ≥8MPa.

III. Structural Stability Assurance: Balancing Hollow-Out and Strength

Hollow-out designs easily lead to structural weakness, requiring enhanced stability. Edge reinforcement difficulty: stress concentration at hollow-out edges easily causes cracking, requiring additional layers of mesh fabric (1-2 layers more than ordinary panels) or reinforcing ribs; the mesh fabric wrapping Qinglong's hollow-out edges is ≥50mm wide, increasing flexural strength by 30%. Overall stiffness control: when the hollow-out ratio exceeds 50%, panel stiffness decreases, requiring optimized panel thickness (≥15mm) or concealed supports; Qinglong's Sanya Festival Plaza hollow-out panels, with a hollow-out ratio of 60%, meet installation stiffness requirements through concealed reinforcing rib design. Deformation control: drying shrinkage deformation easily occurs during production and curing, requiring controlled curing humidity (≥90%) and temperature (20-25℃); Qinglong's constant temperature and humidity curing keeps deformation ≤L/500 (L is the panel edge length). Project case: the Nanning Liyuan Hotel colored hollow-out GRC panels, with a hollow-out ratio of 55% and complex shapes, achieved a production pass rate of 99% through the above technical solutions, with no deformation or cracking after installation.