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How to Tell Slitting, Cut-to-Length, and Combined Slit/CTL Lines Apart
Table of Contents
1. Definition
Coil processing projects use three different equipment classes that buyers often mix up:
- Slitting line — longitudinal rotary knives cut a master coil into multiple narrower strips that are rewound as strip coils
- Cut-to-length (CTL) line — strip is leveled and sheared crosswise into flat sheets at set length, then stacked / discharged
- Combined slit/CTL (ZHJ class) — one integrated host that can slit/recoil or cut sheets; describe it as combined, never as two fictional separate lines
Industry comparison matrices make the same cut: slitting = width / strip coils; CTL = length / flat sheets; combined lines exist when both formats share one footprint. Cover titles that say “slitting and cut to length” are not enough — classify by the evidenced process chain.
2. Process and applications
| Equipment class | Main output | Typical process idea |
|---|---|---|
| Slitting line | Multiple narrow coils | Uncoil → (level as configured) → rotary slit → edge trim → recoil |
| Cut-to-length line | Leveled flat sheets | Uncoil → level → shear → stack / discharge |
| Combined slit/CTL (ZHJ) | Strip/recoil OR sheets on one host | Uncoil → level / slit / shear integrated → recoil or sheet exit |
Applications. Slitting feeds roll forming, tube, and coil-fed stamping. CTL feeds fabrication, laser blanks, and sheet stock. Combined ZHJ suits plants that need both modes without two full footprints.
3. Reference parameters (examples — keep classes separate)
3.1 Slitting examples
| Tier | Thickness × width | Speed / power notes |
|---|---|---|
| Simple hydraulic slitter | About 0.38–0.8 mm × about 500–1380 mm | About 0–40 m/min; about 12 strips; slitter main about 15 kW; recoiler about 30 kW; coil about 10 t |
| ZJX-1.5×1250 | About 0.3–1.5 mm × about 800–1250 mm | About 20 m/min; about 10 strips; slitter about 37 kW; recoiler about 90 kW; coil about 15 t |
| ZJX high-speed 3×1600 | About 0.3–3 mm × about 500–1600 mm | About 0–80 m/min; installed about 250 kW class; knife shaft about φ220 |
3.2 CTL example (simple flat)
| Item | Documented reference |
|---|---|
| Thickness / width | Point values on that quote: thickness 3 mm; width 1500 mm (do not invent a band) |
| Speed / power | About 0–15 m/min; leveler main about 7.5 kW; hydraulic about 5.5 kW; Delta PLC |
3.3 Combined ZHJ×1300 example
| Item | Documented reference |
|---|---|
| Thickness / width | About 0.5–3 mm; width about 1300 mm (model strings may conflict — contract decides) |
| Speed / strips / power | Speed ≤ about 25 m/min; strips ≤ about 8; total motors about 70 kW; hydraulic about 7.5 kW; knife shaft about φ150 |
4. Boundaries and conflicts
- Calling every slitter a CTL line — Wrong output. Strip coils ≠ flat sheets.
- Splitting one ZHJ combined host into two public “lines” — Forbidden. Keep one combined description.
- Copying ZJX ~250 kW onto a simple CTL ~11 kW-class inquiry — Forbidden.
- Cover title “slitting and cut to length” on a slit-and-recoil-only quote — Classify by process chain, not cover wording (see ZJX-1.5×1250 caution).
- Auxiliary slit blades on a simple CTL — Not equal to a full slitting-line rating.
5. Buyer FAQ
How do I choose among the three classes?
Strip coils only → slitting. Flat sheets only → CTL. Both modes on one footprint → ZHJ combined. Start from output format, then lock thickness, width, coil weight, and speed on the named proposal.
Is a combined line the same as owning a slitter plus a CTL?
No. It is one integrated host with mode capability. Do not describe it as two separate lines in public copy.
Can I use high-speed slitter power on a simple CTL quote?
No. Keep class parameters side by side; never average or cross-fill.
Why do some slitter covers mention cut-to-length?
Marketing wording. If the evidenced chain is only slit-and-recoil, it remains a slitting line for classification.
Final ratings follow the confirmed technical proposal. Price and lead time are out of scope.
References
- 06-SLIT-CTL thematic FAQ set (slitter tiers; CTL-SIMPLE-FLAT; ZHJ×1300 combined)
- Industry slitting vs CTL matrix: Metal slitting vs CTL lines — comparison matrix
- Industry coil-cutting line types: Coil cutting lines — slitting, CTL, and combined
- Related encyclopedia: coil slitting lines; slitter vs CTL Q&A; slitter process flow