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

The boundaries of architectural aesthetics are constantly being pushed forward, and curved forms, as the finishing touch of modern architectural design, place higher demands on material and process innovation. As an industry leader with 28 years of deep expertise in the UHPC/GRC/GRG/GRP materials field, Qinglong Group has found through its practice of serving thousands of landmark projects that traditional wooden molds gradually reveal insurmountable technical bottlenecks in the production of complex curved GRC panels. This article analyzes the underlying reasons why curved GRC panels are moving away from wooden molds from three dimensions—material properties, process limitations, and cost structure—and systematically presents Qinglong's solutions in mold technology innovation.

The Inherent Conflict Between Curved GRC Panels and Wooden Molds: From Material Properties to Process Limitations

Traditional wooden molds, with their advantages of low cost and easy processing, once dominated the production of flat or simply shaped GRC components. However, when it comes to the production needs of curved GRC panels, their shortcomings are fully exposed. First, the natural physical properties of wood mean it cannot stably bear the complex stresses of curved forms—during GRC slurry casting, wooden molds are prone to precision deviations caused by moisture expansion, while drying shrinkage may cause surface cracking of components, which is a fatal flaw for projects requiring millimeter-level precision such as the Dongguan Women and Children's Activity Center. Second, curved GRC panels often involve complex structures such as double-curved surfaces and openwork reliefs. The joints of wooden molds directly affect the surface flatness of components, falling far short of the "surface defect ≤0.5mm/m" requirement in the Technical Standard for Building Application of Glass Fibre Reinforced Cement (GRC), which Qinglong participated in drafting.

The Dual Dilemma of Efficiency and Cost: The Unsustainability of Traditional Processes

From an industrialization perspective, the economics of wooden molds in curved GRC panel production are no longer sustainable. Data from a commercial complex project show that customizing a set of double-curved wooden molds takes three times the work hours of a standard flat mold, with a service life typically not exceeding 5 uses, while the new mold technology adopted by Qinglong allows more than 30 reuses. More critically, wooden molds carry high storage and maintenance costs—requiring regular anti-corrosion treatment in humid environments, which runs counter to Qinglong's corporate philosophy of "environmental innovation." In the Century Plaza renovation project on Nanjing East Road, light-transmitting GRC components produced with traditional wooden molds had a rework rate as high as 15% due to mold deformation, directly driving up project costs by nearly 20%.

Qinglong's Solutions: From Mold Innovation to Full-Chain Technology Empowerment

As a National High-Tech Enterprise, Qinglong tackles the production challenges of curved GRC panels through three technical pathways: First, adopting a digital mold system, using Rhino+Grasshopper parametric design and CNC machining technology to achieve precise replication of complex curved surfaces, with mold accuracy controlled within ±0.3mm; Second, promoting glass fiber reinforced plastic (GRP) molds, which offer a flexural strength of 250MPa, a surface finish rivaling that of mirrors, and weather resistance meeting extreme environmental requirements from -40°C to 80°C; Third, innovating a modular mold system that adapts to different curvature requirements through the combination of standard modules, increasing mold reuse rates by 60%. These technical innovations not only support Qinglong's annual production capacity of 600,000 square meters, but also raised the installation efficiency of the double-curved GRC curtain wall for an opera house project in Guangzhou by 40%, perfectly realizing the architect's design vision of a "flowing rhythm."

The iteration from wooden molds to new-type molds is essentially the inevitable leap of the architectural decoration materials industry from being experience-driven to technology-driven. As a participating drafter of the General Technical Conditions for Ultra-High Performance Concrete (UHPC) Non-Load-Bearing Components, Qinglong Group has always upheld the mission of "creating beautiful architecture," turning more imaginative design concepts into reality through collaborative breakthroughs in material R&D, mold innovation, and construction technology. In the field of new-type architectural decoration materials manufacturing, only by deeply integrating material properties, digital technology, and engineering practice can we truly unleash the aesthetic potential of GRC materials in curved forms and inject lasting vitality into architectural art.