Which Sandwich Line Do You Need: PU Foaming or Rockwool/EPS Composite?

1. Selection principle

Start from the core material and bonding method the finished panel must ship — not from a generic “sandwich panel machine” label. Polyurethane full-core foam, PU-edged rockwool, and EPS/rockwool glue composite share a catalog neighborhood but use different station lists, footprints, and power sheets. Industry type guides make the same split by continuous vs discontinuous plants and by PU/PIR vs mineral wool vs EPS cores; use that as background, then open the matching encyclopedia page.

After the family is fixed, confirm profile drawings (roof vs wall), thickness range, and whether edge sealing is mandatory. Those three checks prevent most cross-fill mistakes before anyone opens a speed table.

2. Quick path by core process

1. Polyurethane full-core foam → PU continuous foaming line (then double-belt vs belt hard-foam tier)
2. Rockwool with PU edge seal (continuous) → PU-edge rockwool configuration
3. EPS or rockwool boards with glue → glue configuration

3. Selection map

4. Parameter traps

• Quoting PU-edge ~90 kW for a PU foam or glue inquiry
• Assuming every sandwich line includes automatic rockwool splitting / flip
• Treating decorative facade / carved wall equipment as insulated sandwich production
• Merging double-belt best ~4 m/min with belt hard-foam ~2–6 or with RW normal 3–5 into one answer
• Publishing upper-former ~12 m/min as whole-line glue capacity

5. Next pages

• Boundary overview: WIKI-N-SANDWICH-BOUNDARY
• Equipment: WIKI-N-SANDWICH-PU / RW / EPS; belt hard-foam
• Process maps: WIKI-P-SANDWICH-PU-FLOW / RW-FLOW / EPS-FLOW
• Do-not-mix: WIKI-Q-RW-VS-PU-MIX; speed tiers: WIKI-Q-PU-SPEED-TIER

6. Buyer FAQ

Should I start from annual m²?

Yes as a capacity check for continuous vs compact glue plants — but core code and fire/thermal duty still come first. A high-m² fire wall still wants rockwool, not a pasted PU foam sheet.

Is “PU sandwich line” enough on an RFQ?

No. Say whether you need full-core continuous foam, PU-edged rockwool, or glue composite (EPS or rockwool boards). Ambiguous wording invites mixed numbers.

Can one footprint run all three cores?

Some commercial packages claim multi-core flexibility, but encyclopedia ratings stay on named configurations. If the project truly needs two products, expect two process stories — not one averaged speed table.

Where do belt hard-foam variants fit?

Inside the PU continuous family as a separate speed/power tier (~2–6 m/min; ≥35 kW). Choose them after you already know the core is polyurethane foam — see the speed-tier page.