Top Trusted Aluminium Arch Door Supplier & Exporter

Our CNC stretch-bending and multi-roll forming machines operate within a strict architectural deviation tolerance of ±1.0 mm to ±1.5 mm across the arc length, well within EN 12020-2 and AAMA standards. For true Roman semi-circular arches, our standard minimum centerline radius ($R_{min}$) is 450 mm for thermally broken profile depths of 70mm–90mm. For non-thermal or secondary decorative profiles, custom bend radii down to 350 mm can be achieved without visible outer wall necking or web buckling.

Thermal breaks in linear profiles rely on PA66 GF25 polyamide strips mechanically rolled into knurled extrusion pockets. In curved sections, traditional rolling after bending causes delamination. DERCHI utilizes two specialized techniques: (1) Pre-tensioned stretch-bending where internal and external aluminium sections are formed on matched synchronized dies with flexible core mandrels; and (2) Specialized polyurethane or structural polyaramide continuous curved barriers that maintain shear strength ($T \ge 30\text{ N/mm}$) and air sealing, achieving whole-door U-values down to 0.80 – 1.2 W/(m²·K).

Yes. For arched pivot systems, the top pivot pin is anchored either into the vertical springline of the frame or engineered through a custom header bracket positioned inside the curved transomed head. We partner with world-leading hardware systems including FritsJurgens System M+, Siegenia, Roto Frank, and GU (Gretsch-Unitas). For arched French casements, our five-axis CNC routers machine precision Euro-grooves directly into curved stiles, allowing full concealed multi-point security locking meeting European RC2 and RC3 burglar resistance standards.

Arch doors cannot be safely flat-stacked in conventional corrugated packaging. DERCHI manufactures custom heavy-duty, fumigated plywood export crates (ISPM 15 compliant). Each curved frame and sash is wrapped in low-density polyethylene protective film, padded with closed-cell expanded polyethylene (EPE) foam edge guards, and strapped into tailored internal timber cradles with high-tensile steel banding. Fragile glass units receive dedicated internal shock-absorbing elastomer buffers. Over 25 years of global shipping, our ocean freight damage rate remains under 0.12%.

We offer two premium architectural finishing tracks: (1) Qualicoat Seaside Class 2 super-durable powder coatings from AkzoNobel or Tiger Drylac, tested to withstand 1,000+ hours of continuous neutral salt spray and extreme UV exposure; and (2) Qualanod Class 1 (25-micron) architectural anodizing in natural silver, champagne, bronze, and deep matte black. All finishes come backed by 15 to 25-year structural finish warranties, making them fully compliant with harsh beachfront marine environments.

Upon receipt of your door schedule and site opening dimensions, our engineering team generates comprehensive CAD/BIM shop drawings within 48 to 72 hours. Following technical drawing sign-off and color approval, fabrication lead times generally range between 25 to 35 working days depending on whether custom glass coatings (e.g., specific solar Low-E interlayers) are specified. Ocean shipping times to major ports average 22–28 days to Western Europe (Rotterdam, Felixstowe, Hamburg) and 14–18 days to the US West Coast.