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Sandwich Panel Core Thickness: Why It Must Be Confirmed in the Proposal
Table of Contents
1. Definition
Core thickness is the insulation layer height between metal skins on a sandwich panel. Lines are sized around foam chemistry or board thickness, side molds / belt gap, and cut-off capacity. There is no single public core thickness that covers every PU, rockwool, and EPS inquiry.
This page explains how documented bands differ by configuration and why molds and recipe must be locked on the proposal.
2. Why thickness drives the line
- Double-belt / rubber-belt gap and side stops set the cured foam height.
- Rockwool and EPS board stock must match the target panel thickness before lamination.
- Flying-saw / band-saw cut thickness capability must cover the thickest sold panel.
- U-value, fire rating, and structural claims all depend on the finished core — confirm with panel drawings.
Applications. Any roof or wall sandwich order where the buyer states “50 mm / 75 mm / 100 mm” (or another target) before equipment selection.
3. Reference bands by line type (keep separate)
| Line / configuration | Core thickness reference | Notes |
|---|---|---|
| PU double-belt continuous (main) | Not locked as one universal public value on the English quote | Confirm molds and chemical recipe in contract |
| PU belt hard-foam variant | Named tiers 35 / 50 / 75 / 100 mm | Do not treat as the only PU answer worldwide |
| PU-edged rockwool continuous | About 50–100 mm | With effective width about 1000 mm; length about 3000–15000 mm |
| Rockwool pad (when PU line includes wool handling) | About 1200×2400×100 mm pads; density about 100–120 kg/m³ | Only when that unit is on the BOM |
| EPS / rockwool glue composite | Product / interlayer about 50–250 mm per customer requirement (short-table alternate about 50–150 mm) | Do not paste onto PU foam answers |
Industry continuous catalogs often list broad ranges such as about 30–200 mm or 40–250 mm. Use those as market context; publish the labeled package bands above for ZTRFM encyclopedia answers.
4. Boundaries
- Never invent one averaged core thickness across PU foam, PU-edge rockwool, and EPS glue.
- Skin thickness (for example PU 0.35–0.8 mm vs rockwool 0.4–0.6 mm) is not core thickness — keep fields separate.
- Cut-off “about 150 mm class” capability on some PU saw notes is a machine limit, not a mandatory product SKU.
- Fire / lambda values belong to panel certificates, not this machine page alone.
5. Buyer FAQ
Why will the seller not give one fixed core thickness on the website?
Because different configurations publish different bands, and molds / chemistry change with the order. Lock thickness on the proposal.
Is 100 mm the standard for every rockwool line?
No. The PU-edged rockwool scheme commonly cites about 50–100 mm. Exact SKUs follow the contract drawing.
Does the PU belt 35/50/75/100 list apply to the double-belt main quote?
No. Those tiers are documented on the belt hard-foam variant. The main double-belt English quote does not treat one core as the only truth.
What should I send in the RFQ?
- Target core thickness and panel length
- Core type (PU foam / rockwool / EPS)
- Whether mineral-wool handling is required on a PU line
Final thickness follows molds, recipe, and the signed equipment list. Price and lead time are out of scope.
References
- SANDWICH-PU FAQ Q8 (core); SANDWICH-RW FAQ Q5 (50–100 mm); SANDWICH-EPS FAQ Q8 (50–250 mm)
- Related encyclopedia: sandwich boundary; PU continuous; rockwool speed-power
- Industry thickness context: PU/PIR/rockwool continuous line thickness FAQ overview