§ The Line

From stucco silo to bundler.

A continuous board line is a coupled chain of nine processes. The additive chemistry decisions you make at three of them — mixer, foam generator and forming station — determine what happens at the other six. Hover any stage to see what we recommend.

Forming station — extruder, edge dams, paper rolls and slurry meniscus
Plate I · Forming station
Industrial pin mixer — slurry inlet, pin rotor, foam port, outlet boot
Plate II · Pin mixer
Continuous multi-deck gypsum board drying kiln — flash, main and equalization zones
Plate III · Board kiln · three thermal zones
Gypsum Board Production Line · additive injection points
→ board travelStucco SiloCaSO₄·½H₂O01NG-R/APin Mixer9–14 m/s tip02NG-DDispersant Dose0.08–0.35% bwoc03NG-FFoam Generator40–90 g/L04NG-SForming Stationedge dam · meniscus05Setting Belt~60 s06Knifeclean cut07Board Kilnflash · main · equal.08BundlerQC · shipment09
FOAM · Foam Generator

Surfactant + air to deliver controlled bimodal foam. Half-life and bubble size set the board density.

Open NG-F
Stage-by-stage notes
01 · Stucco silo

Calcined hemihydrate, sometimes blended with anhydrite. Two-week age can shift downstream dosage by 10–15%. Date your silos.

02 · Pin mixer

Wets stucco, incorporates foam. Pin pattern, rotor speed and clearance silently degrade with time — see our maintenance protocol.

03 · Dispersant dosing

PCE or BNS metered into the mixing water. The single largest energy lever on a board line.

04 · Foam generator

Air + surfactant + stabiliser. Bimodal distributions for ultralight cores; narrow stable foam for standard density.

05 · Forming station

Edge dam + meniscus + paper bond. The rheology window is narrower than most plants realize.

06 · Setting belt

60-second hydration journey from extruder to knife. Initial set must land before the cut, final set after.

07 · Knife

Crumb, sticking and edge crack are upstream chemistry problems — not knife problems.

08 · Board kiln

Three zones (flash · main · equalization). Additive changes ripple through all three.

09 · Bundler

Final QC: paper bond, weight, edge profile, moisture. The result of every decision made upstream.

Catalog mapped to the line
Patent Intelligence
See the patent architecture behind each stage of the line →

UltraLight foam, PMHS hydrophobization, PCE comb chemistry, Type X fiber-vermiculite cores — diagrammed.

Plant Toolkit
Run the calculators that sit behind every stage →

Retarder dose, foam draw, BHP and PCE — empirical estimators with the constants we trust.