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How to Tell Sandwich Lines Apart: PU Foaming vs Rockwool/EPS Composite Family
Table of Contents
1. Definition
Buyers often ask for one “sandwich panel line.” Technically you first choose the machine class, then the configuration:
- Class A — PU full-core continuous foaming: high-pressure PU foam + double-belt (or belt-variant) cure for a polyurethane core.
- Class B — Rockwool / EPS composite family: preformed rockwool or EPS boards bonded into the panel; configurations include PU-edge continuous and glue composite.
Market catalogs sometimes advertise multi-core switchable lines. This encyclopedia still keeps rating tables separate so a buyer does not receive one blended speed/power answer.
2. Selection path and applications
- Lock the core technology: full PU foam vs rockwool vs EPS board.
- If composite family: lock PU-edge vs glue.
- Confirm optional units (mineral-wool handling on a PU line, etc.) in the equipment list — never assume.
- Only then copy speed, power, footprint, and core thickness from the matching page.
Applications. Roof and wall insulated panels for industrial buildings, cold rooms, and partitions — each class suits different fire / insulation / cost priorities. Final performance follows the panel specification and tests.
3. Reference parameters by class (do not average)
| Class / configuration | Core process | Speed reference | Power reference |
|---|---|---|---|
| PU continuous foaming (main) | High-pressure PU + double-belt cure | Best about 4 m/min; design best about 5 | Installed about 40 kW (+ optional heat about 90 kW) |
| PU belt hard-foam variant | Rigid foam + rubber-belt cure | About 2–6 m/min | Main ≥ about 35 kW |
| PU-edged rockwool continuous | Rockwool + PU edge + roll cure | Normal about 3–5 m/min; max about 8 | Whole-line about 90 kW class |
| Glue composite (EPS/RW boards) | Glue spray + heat; often manual core feed | Composite about 5 m/min | About 50 kW class (short-table alternate about 28 kW) |
Each row is a labeled reference — never merge rows into one public band.
4. Boundaries
- Do not paste ~90 kW PU-edge or ~50 kW glue onto a PU foam inquiry.
- Do not paste PU best-about-4 m/min onto a rockwool or EPS glue inquiry.
- Optional rockwool units on a PU continuous BOM must appear in the signed list — presence is not automatic.
- Decorative carved facade panel machines are outside both classes above.
- Footprint and core-thickness pages also keep class labels; see related entries.
5. Buyer FAQ
Is “one sandwich line” enough for the RFQ?
No. State core type (PU foam / rockwool / EPS) and whether you need PU-edge or glue bonding. Otherwise vendors may quote different classes.
Is PU-edged rockwool the same as full PU foam?
No. PU-edged rockwool keeps a mineral-wool core and foams mainly at the edges. Full PU foam fills the core with polyurethane.
Can glue-config and PU-edge share one power number?
No. Glue about 50 kW class and PU-edge about 90 kW class are different configurations — publish separately.
What if a catalog claims PU + rockwool + EPS on one machine?
Treat that as a commercial option. Still lock which core mode the proposal will run, and use that mode’s rating table.
Final ratings follow the confirmed technical proposal for the chosen class. Price and lead time are out of scope.
References
- SANDWICH-PU / SANDWICH-RW / SANDWICH-EPS thematic FAQs (boundary Q3 across packs)
- Related encyclopedia: PU continuous; rockwool/EPS composite; glue configuration; speed-power
- Industry class context: Rockwool continuous line vs PU/EPS modules overview