Recoiler or Cut-to-Length Stacker?

Choose a recoiler when the usable product must remain a slit coil; choose cut-to-length stacking when the usable product must be a flat blank.

That output-format decision determines how the material moves after slitting, how it is stored and handled, and what the next machine must accept. The STEFA EH1000 RECOILER is a reference point for the coil-output path, but its fit depends on the complete strip program rather than on the recoiler name alone.

Start with the required output

A slitting line unwinds a master coil, separates it into narrower strips with rotary knives, manages the strip path, and rewinds the processed strips into individual coils. That format fits a customer or downstream machine that accepts coil stock, including roll-forming and other continuous coil-fed operations.

A cut-to-length line follows a different path. Straightening or leveling removes coil set and improves flatness, the material is sheared to length, and a stacking table receives the flat pieces. This is the better endpoint when the order calls for dimensioned blanks that will be handled, stacked, or processed individually.

Neither endpoint is automatically better. A recoiler is unnecessary if every order requires flat blanks, while a stacker adds an avoidable output conversion when the next operation is designed to accept narrow coils. Operations with both requirements should evaluate a line arrangement that can change output format without compromising tension, separation, handling, or access.

What the STEFA EH1000 does

The EH1000 is designed to recoil processed slit coils. Its published design uses a gearmotor, hydraulic expansion mandrel, and felt press. The mandrel locks the material onto the coil core, while the felt press supports controlled contact as the strips build into finished coils.

The official STEFA product-family page shows the EH1000 with a maximum load capacity of 15,000 kg, coil width up to 1,700 mm, speed up to 80 m/min, and 15 kW power. Those values are useful for initial screening, not application approval.

The public specifications are not fully aligned. The Mac-Tech EH1000 listing shows a 12,000 kg maximum coil weight and 20 m/min speed with its contactless sensor, while the STEFA page shows the higher capacity and speed values. A buyer should reconcile that difference with Mac-Tech and STEFA before treating any rating as the specification for the supplied machine.

The EH1000 also remains a recoiler component within the material path. It does not by itself establish the suitability of the slitter, tension section, loop arrangement, controls, guarding, coil-removal equipment, or downstream machine.

Tension and separation shape the finished coil

Slit strands do not always take up at the same rate. A master coil can be crowned, with the center larger in diameter than the edges, so center strips can advance more quickly while outboard strips become loose. A tensioning device between the slitter and recoiler manages that difference.

Pull-through slitting lines use the recoiler to pull material through the slitter and rewind the processed strips. Loop slitting lines use a loop pit to absorb strip-length differences before the strips reach the recoiler. The line architecture changes how the recoiler interacts with the slitter and how tension must be controlled.

Separator discs and spacers keep adjacent strips from interleaving. Their placement must match the strip widths and number of strands in the run. Unequal tension, poor alignment, or unsuitable separation can lead to loose winding, telescoping, edge damage, or coils that are difficult to remove, package, ship, or feed.

When cut-to-length stacking is the better path

Cut-to-length stacking fits orders that require flat blanks with defined lengths, flatness, and stack handling. Straightening and leveling are important because the incoming coil carries curvature and may also have wavy edges or center buckling that affect the finished blank.

A modular coil line can support more than one output strategy. It can produce sheets for sale or intermediate storage, make strips for recoiling, recoil large coils into smaller coils, or feed downstream punching, laser-cutting, or panel-bending equipment. The useful configuration still depends on which output each order requires.

A combined line can switch between the two paths when the layout is designed for it. A 2024 cut-to-length and recoiling installation used a movable runout table that supported blanks in cut-to-length mode and moved out of the strip path for recoiling. Adjustable separators, coil alignment, and a practical method for pushing finished coils off the spindle were part of that application-specific arrangement. The same concept cannot be assumed to fit another line without reviewing controls, guarding, space, and removal access.

Match the machine to the coil program

Begin with the incoming material: grade, gauge, coating, surface finish, width, inside diameter, outside diameter, total weight, and loading method. Then define the slit-width program, number of strands, strip edge condition, expected camber, and any twist or shape issue that could affect winding.

Finished-coil requirements matter just as much. Confirm the target inside diameter, outside diameter, width, weight, packaging, orientation, and removal method. Forklift access, a coil car, crane capacity, operator clearance, and the finished-coil travel path can change the practical fit even when the strip width and total weight appear acceptable.

Evaluate speed as an operating profile rather than a single maximum number. Acceleration, deceleration, stop-start behavior, line volume, and tension response must work with the slitter and any loop or tension stand. The downstream roll former or other coil-fed machine also sets requirements for coil stability, surface condition, width, and unloading orientation.

Review surface protection, integration, and maintenance

Coated, prefinished, stainless, and other surface-sensitive materials require a review of every contact point. Confirm the suitability of the felt, separator, guide, mandrel, pressure, and strip-contact materials for the finish being processed. The public EH1000 information identifies a felt press and hydraulic mandrel but does not establish every material-specific contact configuration.

Integration can require control handshakes, line-speed coordination, emergency-stop functions, guarding, operator access, and a defined method for removing finished coils. If the line must switch between recoiling and cut-to-length production, the discharge table, runout arrangement, and changeover path need to be part of the design rather than an afterthought.

Maintenance access should be evaluated before purchase. Mandrel segments, frame alignment, bearings, gearbox condition, brake or felt-system wear, lubrication, hydraulic components, and guarding all deserve an inspection and service plan. Acceptance criteria should cover winding tightness, telescoping, strip alignment, surface condition, coil stability, changeover time, and safe finished-coil removal.

The practical decision

Specify the recoiler when the saleable or usable product is a slit coil, when a downstream machine consumes narrow coil stock, or when a slitting operation needs a controlled coil-form discharge. Specify cut-to-length stacking when the customer needs flat blanks ready for handling or fabrication. If both outputs matter, compare the cost and complexity of a combined configuration with the actual order mix instead of assuming that either endpoint can serve every job.

I’m Patrick O’Neill, Mac-Tech’s National Product Manager / Regional Sales Executive for the U.S. National market. My coil-lines work covers feed sequence, straightening, cutoff, orientation, controls, line acceptance, and training. I can help assess whether a STEFA recoiler, a complete coil-line configuration, or a cut-to-length arrangement fits the application. Bring the coil grade, gauge, coating, dimensions, weight, slit-width program, finished-coil requirements, downstream-machine details, speed targets, and available handling space so the recommendation addresses the complete material path.