Semi Rigid Aluminum Duct Forming SBLF‑500

Specifications, applications and operation

Specification breakdown. The Semi Rigid Aluminum Duct Forming SBLF‑500 is offered in models SBLF-500, covering diameters from Φ80–Φ500 mm, handles material thicknesses of 0.08–0.15 mm, with a maximum working width of 60 mm, corrugated standard 6 corrugations, at a forming speed of 0–25 m/min, lock form Double-decked tabby locking / Twill, requires 2 kW, and weighs approximately 260 kg, mainframe dimension 2210×830×1530 mm, requires 380V / 50Hz / 3PH.

Typical applications. Flexible duct manufacturing equipment supports a market that's grown rapidly with the rise of residential and light commercial ducted air-conditioning — semi-rigid aluminium duct, insulated flexible duct and canvas flexible connectors are now standard items in every HVAC supply catalogue. Typical buyers include flex duct OEMs supplying wholesale distribution, vertically integrated HVAC system manufacturers and large-volume installers running their own flex production.

How it works. Flexible duct manufacturing equipment combines coil feeding, helix forming, sleeve assembly and insulation wrapping into a continuous production line. The output is a finished length of insulated or uninsulated flexible duct, cut to the customer's required length, ready for packaging and distribution.

Quality, certification and after-sales. Like every machine in the SBKJ catalogue, this unit is built to ISO 9001:2015 quality management standards and CE marked for European conformity. The factory in Jiangyin, Jiangsu has been operating since 1995 and SBKJ holds 60+ invention and utility patents in HVAC ductwork machinery design. Each machine ships with a 12-month warranty on mechanical and electrical components, lifetime spare-parts availability, and 3–7 days of on-site installation supervision and operator training by an SBKJ engineer. Remote support is available via WhatsApp and email, with engineer response within 12 hours and technical troubleshooting within 72 hours.

Where this fits in your workshop

Flexible duct machines run as a small dedicated cell, usually separate from the rigid-duct workshop because the products and the materials are fundamentally different. A typical flex cell has an aluminium-foil decoiler, the helical winder or sleeve forming station, an insulation wrapping station for insulated flex, an end-shrinking machine to prepare connection ends, and a packaging table. SBKJ can supply the cell as a turnkey package or as individual modules to drop into an existing flex line.

Pre-purchase checklist

Use this list when you write the enquiry or when you compare two suppliers. Each line is something an SBKJ engineer will want clarified before quoting.

• Diameter range matched to your distribution channel (residential vs commercial)
• Insulation type compatibility (glasswool, polyester, none)
• Maximum continuous run length per cycle
• Operator skill level — flex machines are typically run by 1–2 people
• Power demand at the heater elements, not just the main drive
• Compressed air spec if the machine uses pneumatic clamping

Operator and maintenance notes. The Semi Rigid Aluminum Duct Forming SBLF‑500 is designed to be run by a single trained operator under normal conditions. Daily checks include lubrication of the forming rolls, inspection of the drive belts and chain tension, and a clean-down of the tool surfaces. Weekly checks add electrical cabinet inspection and a torque check on the main frame fasteners. SBKJ ships every machine with an English operator manual, a maintenance schedule and a recommended two-year spare parts kit. Operator training is included in the 7-day commissioning visit, and a refresher session can be booked at any time within the warranty period.