Why Arbitrarily Curved GRC Panels Cannot Use Traditional Wooden Molds: Cause Analysis and Alternative Solutions

Amid the growing pursuit of personalized and artistic expression in contemporary architectural design, free-form curved GRC panels have become a key material for shaping architectural aesthetics thanks to their exceptional formability. However, traditional wooden molds repeatedly fall short in producing such components, revealing many limitations that are difficult to overcome. As an industry leader with 28 years of deep expertise in UHPC/GRC/GRG/GRP materials, Qinglong Group will start from the technical fundamentals to thoroughly analyze the pain points of traditional wooden molds and systematically present innovative modern mold technology solutions, providing a professional reference for decision-making by designers and owners.

**Technical Bottlenecks of Traditional Wooden Molds: Multidimensional Constraints from Material Properties to Production Efficiency**

Curved GRC panels place stringent demands on mold precision, durability, and adaptability, while the inherent properties of wood make it ill-suited to the task. First, wood has poor physical stability: in the hot, humid environment of GRC slurry pouring and curing, it easily expands, contracts, or deforms, causing surface waviness, dimensional deviation, and other defects on components. For complex forms such as double-curved and twisted surfaces, the insufficient rigidity of wooden molds directly affects forming accuracy. Second, wooden molds typically last only 5-10 casting cycles; for mass-production projects, frequent mold replacement substantially increases costs. Moreover, wood's machining accuracy is limited by manual operations and cannot achieve the micron-level details of digital designs—a sharp contradiction with modern architecture's requirements for curve smoothness and joint precision.

**The Mold Revolution for Curved GRC Panels: Innovative Practice of Qinglong's Full-Chain Technology System**

To address the limitations of traditional wooden molds, Qinglong Group, leveraging the technological accumulation of its national-level R&D center, has built a solution centered on "digital design + composite mold technology." On the design side, the Rhino+Grasshopper parametric platform is used to precisely model curved forms, while BIM technology enables virtual pre-assembly of molds to eliminate interference issues in advance. On the production side, three categories of innovative molds are flexibly selected according to project needs: for small batches of irregular components, glass fiber reinforced plastic (GRP) molds are adopted, with surface smoothness up to Ra0.8μm and service life extended to over 50 uses; for mass-produced standardized curved components, aluminum alloy modular molds have been developed, with CNC machining ensuring repeatable positioning accuracy of ≤0.5mm; and for extra-large double-curved components (such as curtain wall units with spans exceeding 10 meters), an innovative combination of 3D printing and resin composite mold technology achieves integrated forming of complex textures, raising production efficiency by 300% over traditional processes.

**Mold Selection Strategy from a Full Life-Cycle Perspective: The Art of Balancing Cost, Efficiency, and Quality**

Choosing mold technology requires balancing three factors: project scale, shape complexity, and cost control. Drawing on experience from 2000+ projects, Qinglong Group has developed a quantitative decision-making model: when the component count is <50 and curvature variation is complex, GRP molds offer the best cost-effectiveness; when the count exceeds 100 and shapes are relatively regular, aluminum alloy molds can cut unit costs by 40%; and for key visual components of landmark projects, although 3D-printed molds involve higher initial investment, they can significantly reduce rework costs caused by shape errors. Taking the Dongguan Women and Children's Activity Center project as an example, the double-curved GRC curtain wall panels produced by Qinglong with GRP composite molds achieved 0.3mm joint accuracy, passed acceptance at the first attempt, and saved 28 days of construction time compared with the original wooden mold plan.

From the "experience dependence" of the wooden mold era to the "precise control" of the digital mold era, the production technology of GRC curved components is undergoing a qualitative leap. As a principal drafting unit of the Technical Standard for Architectural Application of Glass Fiber Reinforced Cement (GRC), Qinglong Group has consistently driven industry progress through technological innovation. Its mold technology system has been successfully applied in benchmark projects at home and abroad, including the translucent concrete project at Century Plaza on Nanjing East Road and the auditorium of King Saud University in Saudi Arabia. Going forward, with the development of UHPC and GRC composite technology, mold technology will evolve toward lighter weight and greater intelligence, opening unlimited possibilities for architectural creation. Choosing a professional mold solution not only safeguards engineering quality but also honors and realizes design creativity.