Typical Process Flow of a Cut-to-Length Line

1. Definition

A cut-to-length process flow is the station sequence that turns coil into leveled flat sheets of programmed length. This page documents the common CTL sequence used across simple flat and JPX hydraulic tiers; it is not a substitute for tier-specific thickness/speed tables.

Purpose: produce flat leveled sheets within the CTL thickness and width rating of the chosen tier.

2. Process and applications

Operating sequence

1. Uncoiling — decoiler matched to coil weight (confirm capacity when quotes conflict)
2. Leveling — multi-roll leveler sized to thickness tier
3. Feed and measure — encoder or servo length control
4. Shear — hydraulic cut-to-length shear (flying shear on some other product types — not assumed here)
5. Stack / discharge — simple table or automatic stacker on JPX lines

JPX hydraulic lines commonly add coil-car feeding and automatic stacking. Simple lines may use manual decoilers and basic exit tables.

Applications. Any plant that blanks coil into inventory or fabrication sheets. Station makeup and automation level follow the technical proposal for that tier.

3. Reference parameters (process-linked)

Do not quote top roll-former speed from sandwich panel lines as CTL line speed.

4. Boundaries (related processes)

• Slitting process — Longitudinal knives + recoil; different exit product.
• ZHJ combo process — Adds mode change between slit/recoil and CTL sheet exit.
• Guardrail punch-form-shear flow — Profile forming with punching; not flat CTL.
• Flying-shear blanking — Other product class; not assumed on these CTL FAQs.
• Leveler-only lines — No cut-to-length shear; different scope.

5. Buyer FAQ

Is flying shear included by default?

No. FAQ wording for these CTL tiers assumes hydraulic cut-to-length shear. Flying shear belongs to other product types unless the proposal states otherwise.

Do JPX lines always include automatic stacking?

Many JPX hydraulic quotes add coil car and automatic stacking. Simple lines may use basic exit tables. Confirm automation level on the proposal.

Can I reuse ±1.5 mm length tolerance on every CTL?

That figure appears on the JPX-3×1500 FAQ. Other tiers need their own confirmation — do not universalize it.

Where does decoiler tonnage fit in the flow?

At uncoiling. When simple flat quotes conflict (about 5 t vs 10 t), keep the conflict visible; do not invent a single public tonnage.