Cut to Length vs Slitting Line: Efficiency, Yield and Line Speed Compared

Short answer: The efficiency gap between a cut-to-length (CTL) line and a slitting line is not nameplate speed — both are documented running between roughly 15 m/min and 60 m/min. It is what each line stops for and what each one discards: slitting sells narrow coils and loses edge trim, while CTL sells stacked sheets and loses head, tail and end-of-coil crop.

Deciding which class you need is a different question — start with the ZTRFM selection guide, Slitting Line vs Cut-to-Length Line: Which One Do You Actually Need?. This page stays on throughput and cost per tonne.

How do the two lines compare on the terms that set cost per tonne?

Efficiency term	Slitting line	Cut-to-length line
Output type	Narrow coils, rewound	Flat sheets, stacked
Line speed (documented)	ZJX-3×1250 up to 40 m/min; 22 kW class 0–15 m/min	JPX-3×1250 up to 60 m/min; heavy 5×1600 ≤50 m/min; light class max 20 m/min
Strips per pass	Up to 15 in the documented 1 mm example; 5 at a 47 mm minimum; up to 12 at 20 mm combined	One full-width blank per shear stroke
Yield / scrap	Edge trim to a scrap winder, plus head and tail crop	Head and tail crop and end-of-coil remainder only; no edge trim
Labour	Each narrow coil checked, strapped and removed separately	Pneumatic stacker and exit car; labour at stack change
Changeover	Tooling change: knife pack built, arbor locked, width checked	Recipe change: cut length on servo feed, leveler gap
Footprint / foundation	Not published — request a layout drawing	JPX-3×1250 about 15 × 5 m; heavy 5×1600 about 35 × 8 m

How does each line convert one coil, and what comes off one pass?

A slitting line cuts lengthwise. The documented ZJX-3×1250 hydraulic slitting line runs entry coil car → decoiler → pinch/crop → loop pit → side guide → slitter head → scrap winder → loop → tension stand → recoiler → exit coil car. Trim winds onto the scrap winder; the product leaves as narrow coils.

A CTL line cuts crosswise. The documented CTL leveling line 3×1250 runs coil car → decoiler → 4-hi leveler → loop pit → side guide → servo straighten/feed → cross shear → conveyor → lift table → stacker → exit car. One full-width LD-blade stroke makes one blank.

Strip count is where slitting multiplies. The ZJX-3×1250 knife pack is documented for strips “e.g. 1 mm × 15”; simple / compact slitting lands 5 strips at a 47 mm minimum; the combined CTL + slitting machine carries 13 blades, a 20 mm minimum and up to 12 strips; the 22 kW slitting class runs up to 10 pieces at a 100 mm minimum. A CTL line makes one blank per stroke, always.

Which line runs faster — and what does the m/min figure include?

Documented slitting speeds: ZJX-3×1250 up to 40 m/min; the 22 kW class 0–15 m/min slitting and 0–15 m/min recoiler; the combined shearing/slitting class 1–20 with 2–8 strips.

Documented CTL speeds: JPX-3×1250 up to 60 m/min; the heavy-gauge 5×1600 ≤50 m/min with ±0.5 mm length accuracy at 2 m; the light JPX-(0.5–3)×1250 class on the cut-to-length machine page 20 m/min maximum.

Read those as headroom. A CTL line’s real rate is cut length divided by line speed, minus the time the strip stands still under the shear: at 2 m sheets on a line carrying 60 m/min the ceiling is 30 sheets per minute, and a stop-start cross-cut is then governed by stroke time, not by 60 m/min. ZTRFM’s heavy-plate page likewise notes 0–25 m/min quoted beside 15 m/min specified.

Where does yield go: edge trim or end-of-coil crop?

Slitting loses edge trim — real mass at both edges of the master coil, taken up by the scrap winder — plus head and tail crop from the pinch/crop shear. Trim width is a strip-planning decision, but every machine has a floor (47 mm compact, 20 mm combined, 100 mm on the 22 kW class).

CTL loses no edge trim, because full coil width becomes sheet width. Its loss is head and tail crop and the last partial length at the end of a coil. Slitting trades yield for width flexibility; CTL trades width flexibility for yield.

How much handling, labour and floor space does each line add?

The CTL outfeed is documented as machine-side: the heavy-gauge auto CTL lists a belt table, hydraulic roller lift, pneumatic stacker and exit roller car; JPX-3×1250 adds a squareness check before strapping.

The slitting line ends in a recoiler with separator discs, and every narrow coil is wound, edge-burr checked, strapped and removed individually — fifteen events instead of one on a 15-strip plan. That labour scales with strip count, not tonnage.

Footprint is published only for CTL: about 15 × 5 m for JPX-3×1250 and roughly 35 × 8 m for the heavy 5×1600. ZTRFM slitting pages publish capacity and power — decoiler 11 kW, slitter 45 kW, recoiler 55 kW on the ZJX-3×1250 — but no line outline, so request a layout drawing.

How much does changeover cost in tonnes per hour?

Usually the decisive term. A slitting changeover is a tooling change: the ZJX-3×1250 operation steps describe building the knife pack for the required strip count and thickness, locking the arbor and confirming strip width. It happens at the arbor with the line stopped, and grows with strip count.

A CTL changeover is a recipe change: sheet length on the servo feed and leveler roll gap for the gauge. No knives move. Run many short strip plans and slitting’s stopped time is charged against a small tonnage; run one plan for weeks and changeover fades.

Worked example: effective output per coil (illustrative)

An illustrative calculation built on documented line speeds, not a zt-rfm.com published figure. Replace the assumptions with your own data.

• Coil 1250 mm × 1 mm × 10 t, steel at 7,850 kg/m³ → run length ≈ 10,000 ÷ (1.25 × 0.001 × 7,850) ≈ 1,019 m.
• Slitting: 15 strips at 82 mm = 1,230 mm, 20 mm edge trim (1.6% of mass); 40 m/min; non-productive 40 min knife pack + 10 min thread and crop + 15 min recoil, strap, unload.
• CTL: 1,250 × 2,000 mm sheets at 19.6 kg, 509 sheets; 60 m/min; non-productive 10 min thread and crop + 5 min recipe and first-off + 15 min stack change and unload.

Result: slitting yields about 9.84 t of saleable coil in 25.5 min running plus 65 min setup and handling — roughly 6.5 t/h. CTL yields about 9.95 t, losing only crop, in 17 min running plus 30 min setup — roughly 12.7 t/h.

The gap comes from two terms, not from speed: no edge-trim loss on the CTL side, and a changeover measured in minutes rather than most of an hour. Change to three wide strips with a short knife change and the numbers converge.

FAQ

Which is faster in practice, a cut to length line or a slitting line?

Slitting runs up to 40 m/min on the ZJX-3×1250; CTL up to 60 m/min on JPX-3×1250 and ≤50 m/min on the heavy 5×1600. Achieved tonnes per hour turns on shear cycle and knife-change frequency.

How many strips can a slitting line produce in one pass?

Up to 15 strips (1 mm example) on the ZJX-3×1250, 5 at a 47 mm minimum on the compact build, 12 at a 20 mm minimum on the combined machine, 10 at a 100 mm minimum on the 22 kW class.

Does a cut to length line waste more material than a slitting line?

Usually the reverse. Slitting loses edge trim plus head and tail crop; CTL loses only head crop, tail crop and any end-of-coil remainder.

What does changeover involve on each line?

Slitting is a tooling change: build the knife pack, lock the arbor, verify strip width. CTL is a recipe change: set sheet length on the servo feed and roll gap on the leveler.

Which line needs more labour per tonne?

Slitting, usually: every narrow coil is checked, strapped and removed individually, so labour scales with strip count. CTL stackers and exit cars move sheets without manual handling.

How much floor space do these lines need?

CTL layouts are documented at about 15 × 5 m for JPX-3×1250 and roughly 35 × 8 m for the heavy-gauge 5×1600. Slitting footprints are not published — request a drawing.

Where to go next

ZTRFM publishes the process sequence, capacity window and power figures for both families. Compare cost per tonne at your own strip plan and sheet mix, not one m/min rating — then bring the result to the ZTRFM team as an RFQ.

Sources

All specifications, sequences, capacities and component lists in this article were taken from the following zt-rfm.com pages, fetched directly:

1. Slitting Lines — Process Library
2. Hydraulic Coil Slitting Line (ZJX-3×1250) — Process Library
3. Simple / Compact Slitting — Process Library
4. Cut-to-Length & Leveling — Process Library
5. CTL Leveling Line 3×1250 (JPX-3×1250) — Process Library
6. Heavy-Gauge Auto CTL 5×1600 — Process Library
7. Heavy Plate Leveling & Shear — Process Library
8. Slitting Line vs Cut-to-Length Line: Which One Do You Actually Need? — ZTRFM Information Center (selection guide)
9. High-Speed Metal Slitting Line for 4mm Thickness and 2 Meter Width — product page
10. Cutting Length Line Steel Aluminum PPGI Metal Slitting CTL (combined CTL + slitting) — product page
11. Cut Length Machine Sheet Metal Shearing Cutting (JPX-(0.5-3)×1250) — product page
12. Coil Slitting Machine / Shearing Line with Cut to Length Line Machine — product page
13. Metal Slitting Line Coil Slitting Line (22 kW class) — product page
14. Punching Cut Length Production Line 200 — product page
15. 3mm Steel Coil Cut Length Line 3mm × 1250mm — product page
16. High-Efficiency High-Speed Cut-to-Length Machine 4KW — product page

Data conflicts disclosed

• Slitting line speed on the 4 mm / 2 m slitting line (source 9). The page introduction states the line is designed for 70 to 100 m/min, while the detailed slitter specification on the same page states slitting speed v ≤ 40 m/min. Likely reason: the headline is a design target, while the slitter-head figure is bounded by slit-edge accuracy and the 45 kW frequency-conversion drive.
• CTL line speed for the JPX-3×1250 family (sources 5 and 11). The process page lists up to 60 m/min; the product page for JPX-(0.5-3)×1250 lists a maximum of 20 m/min. Likely reason: the higher figure is strip throughput through the leveler, the lower one is the achievable rate once the servo-measured, stop-start cross-shear cycle is included.
• ZJX-3×1250 thickness capacity (sources 2 and 8). The process page documents 0.4–3 mm thickness and 500–1250 mm width; the selection-guide article cites the same line as widths up to 1250 mm and thickness up to 1 mm. Likely reason: the article’s 1 mm figure comes from the light slitting product class (0.3–1 mm, source 12) and the 1 mm × 15-strip example, not the full ZJX-3×1250 envelope. Use the process-page figure (0.4–3 mm) for capacity planning.