Overview
The STEFA DH500 can serve as coil payoff on a roofing line if the offered configuration fits your coils and its loop-sensed automatic operation works with the roll former; the roll former—not the decoiler—makes the profile.
- Published limits are 5,000 kg maximum load, 1,500 mm maximum coil width, 435–600 mm inside diameter and 1,450 mm maximum outside diameter. Check actual coils against the configuration offered.
- A contactless sensor measures the material loop, and the DH500 has automatic speed adjustment. Verify payoff response, calibration and control fit with the specific roll former; the product information gives no maximum line speed or detailed control-interface specification.
- Confirm loading method, entry alignment and available loop space. Coil-lifter loading is possible, but equipment inclusion is not established. For an assessment, provide coil specifications, roll-former model and operating pattern, control details and a layout sketch.
The STEFA HYDRAULIC DECOILER DH500 merits consideration for a roofing roll-forming line when the coils fit its published envelope and its automatic loop-sensed payoff suits the line. It holds and pays off coil; the roll former, not the decoiler, forms the roofing profile.
The DH500 is hydraulic and motorized, with a maximum load of 5,000 kg, maximum coil width of 1,500 mm, and automatic speed adjustment. Its contactless sensor measures the material loop to support automatic decoiling. Review the STEFA DH500 product details.
Where the DH500 fits in roofing production
A roll former draws strip from the decoiler through successive forming stations to create a continuous roofing profile. The DH500 is a candidate for in-plant roofing-panel and related sheet-metal profile work when the coil dimensions and line arrangement suit the machine. Its useful distinction is automatic payoff based on a measured material loop—not a promise of higher output or compatibility with every roll former.
The DH500 is also listed with a coil inside-diameter range of 435–600 mm and a maximum outside diameter of 1,450 mm. Treat those dimensions, like the weight and width limits, as screening boundaries: verify the actual coil range against the drawing and configuration being offered.
Match loop behavior to the roll former
The loop gives the decoiler and roll former room to accommodate acceleration ramps and changes in material demand. In a retrofit or mixed-supplier line, check the payoff response and control relationship with the specific roll former rather than assuming the machines will synchronize without calibration. The DH500 product information does not establish a maximum line speed or a detailed control-interface specification.
Coil alignment and loop behavior also affect the material entering the forming line. Excess slack or a strip that becomes taut can damage coil or affect produced lengths; poor alignment can contribute to edge problems. Review the material path through start-up and normal running, including available loop space and entry alignment.
Confirm coil fit and loading
Compare typical and maximum coil weights, widths, inside and outside diameters, and material requirements with the proposed DH500 configuration. Also review the roll-former make and model, operating speed and start-stop pattern, entry height, sensor arrangement, and control interface. These details determine whether the published capacity translates into a workable coil-entry setup.
Coil-lifter loading is possible, but that does not establish that a lifter or other handling equipment is included in a particular offer. Confirm the loading method, coil orientation, clearances, threading approach, and operator access as part of the layout review.
I’m Jon Williams, a Mac-Tech Sales Executive serving the Western and Central United States, with northern Wisconsin overflow. My work covers coil entry, roofing roll forming, and line pacing, and I can help assess the DH500’s coil fit, loading arrangement, and payoff match. Bring typical and maximum coil specifications, the roll-former make and model and its operating pattern, control details, and a layout sketch showing the loading area and loop space.
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