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Typical Process Flow of a Coil Slitting Line
Table of Contents
1. Definition
This process entry describes how a coil slitting line converts one wide master coil into multiple narrower strip coils. The purpose is width division and rewind — not cross-cut sheet stacking. Industry process guides describe the same core chain: uncoiler → (leveler) → rotary knives → scrap / edge handling → tension → recoiler.
2. Process and applications
Operating sequence (common wording):
- Uncoiling — manual or hydraulic decoiler sized to the coil-weight tier
- Feeding / leveling — optional or simple on light hydraulic lines; more complete on high-speed automatic lines
- Slitting — rotary knives on arbors set to target strip widths and count
- Edge trim — scrap edge handling / scrap winder
- Recoiling — strip coils rewound under tension; separators prevent interleaving
High-speed line additions. Documented high-speed automatic slitting references may insert loop buffer and head-shear sections before the slitting stand. Confirm those stations on the proposal drawing rather than assuming every slitter includes them.
Applications. Preparing slit coils for roll forming, tube, stamping, and distribution. Not a substitute CTL flow for flat sheets.
3. Reference parameters linked to flow richness
| Configuration cue | Flow richness | Documented capacity reminder |
|---|---|---|
| Simple hydraulic slitter | Basic uncoil → slit → recoil chain | About 0.38–0.8 mm × 500–1380 mm; about 0–40 m/min; about 12 strips; knife shaft about φ120 |
| ZJX-1.5×1250 | Full slit-and-recoil package | About 0.3–1.5 mm × 800–1250 mm; about 20 m/min; about 10 strips |
| ZJX high-speed 3×1600 | Uncoil → (buffer / head shear) → slit → scrap → recoil | About 0.3–3 mm × 500–1600 mm; about 0–80 m/min; installed about 250 kW class; knife shaft about φ220 |
Actual station list, loop-pit presence, and scrap-winder type follow the confirmed quotation BOM — this page is a process map, not a single BOM.
4. Boundaries and conflicts
- Adding CTL stacking to a pure slitter flow diagram — Wrong class unless the host is a documented combined ZHJ line.
- Assuming every line has a buffer pit — High-speed references may; simple hydraulic quotes may not.
- Inventing stations not on the proposal — Forbidden.
- Translated quotation with blocked speed — Use this flow for definition only; do not invent missing ratings.
5. Buyer FAQ
What is the minimum station story I should expect?
Uncoil, slit with rotary knives, handle edge trim, and recoil strips. Leveling and buffers depend on the tier.
When do buffer and head-shear appear?
On documented high-speed automatic slitting references. Ask for them explicitly if your material and speed need them.
Does this flow produce flat sheets?
No. Sheet output needs a CTL or combined slit/CTL host.
Where do strip count and knife setup fit?
At the slitting stand: arbors, knives, and spacers are set to the order’s strip widths and count before the run.
Quality checkpoints during the flow usually include strip-width verification after knife setup, edge-burr inspection, and recoiler tension balance so outer strips do not telescope. Exact tolerance numbers follow the named technical proposal rather than a universal public table.
If the inquiry mixes sheet stacking language into a slitter flow diagram, stop and re-classify the machine before editing the station list.
Final ratings follow the confirmed technical proposal. Price and lead time are out of scope.
References
- SLITTER-ZJX-3X1600 thematic FAQ (process Q1); supporting slitter tier FAQs
- Industry step-by-step slitting guide: How does a steel coil slitting line work — complete process guide
- Industry practical slitting flow: How slitting lines work — practical coil-processing guide
- Related encyclopedia: coil slitting lines explained; slit vs CTL