PU Double-Layer Roller Shutter Slat Lines: Extra Stages vs Single-Layer

1. Definition

A PU double-layer shutter slat line bonds two steel skins with polyurethane foam between them. Beyond single-layer form → hydraulic shear, it adds foaming, heating, reshaping, and tracking cut-off. It is a configuration family inside the shutter-slat group — not a garage continuous foaming panel line and not the default description of every slat host.

2. Process and applications

Typical PU wording (confirm on proposal):

1. Decoil / feed for each skin path as designed
2. Roll form skins
3. Preheat
4. PU injection / metering
5. Heat preservation / curing path
6. Sizing / reshaping
7. Tracking (often flying-saw) cut
8. Exit

Applications. Insulated / foamed interlocking shutter slats where thermal or acoustic performance is required. Market pages sometimes advertise much higher line speeds on thin aluminum — do not paste those onto the ~8–10 m/min PU guidance used with this package family.

3. Reference parameters (keep sources separate)

3.1 PU double-layer guidance

3.2 Single-layer / English baselines — do not paste onto PU

4. Conflicts and open items

• Thickness 0.4–0.9 vs max ~0.6 — Same PU docs may state both; resolve in the contract.
• Power packaging — Do not quote foaming/heating auxiliary power as if it were the only main-line kW.
• High market speeds — Thin-aluminum 40+ m/min ads are not this package’s PU guidance.

5. Boundaries (related machines)

• Single-layer slat host — Form → hydraulic cut; no foam stages by default.
• Garage continuous foaming panel — Wide garage door panels; different equipment class.
• Guide / box / frame lines — Not foamed-slat process maps.

6. Buyer FAQ

Is PU slat the same as a garage door continuous panel line?

No. Garage continuous foaming is a separate equipment class with different panel width and process layout.

Can every English 11 kW slat quote be treated as PU-ready?

No. PU adds foam/heat/reshape/tracking stages and usually different speed/power packaging. Ask for the PU proposal explicitly.

Why do some PU sheets say max 0.6 mm and others 0.4–0.9 mm?

Internal wording conflict on the same family docs. Lock thickness on the mutually confirmed technical proposal.

Does PU include guides and boxes?

Not by default. Guides/boxes remain separate section machines even when the project also buys PU slats.