Coffee Roaster Drum & Chaff Screen is used for forming the perforated drum and chaff collector of coffee roasters so hot air passes the beans while chaff is carried away. ANSI 4 equipment is the reference cited for it on drawings, datasheets and purchase orders.
What ANSI 4 equipment Means for Coffee Roaster Drum & Chaff Screen
The dimensions in the table below are supplied to suit ANSI 4 equipment. Where the standard sets requirements for the finished appliance, device or system, compliance testing of that assembly stays with its manufacturer; we supply the metal mesh part to the drawing and can provide material certificates and dimensional reports with the shipment.
Coffee Roaster Drum & Chaff Screen Dimensions
| Size | Hole diameter (mm) | Pitch (mm) | Thickness (mm) | Open area (%) | Use |
|---|---|---|---|---|---|
| u00d82.0 / P3.5 | 2.0 | 3.5 | 1.0 | 29.6 | Drum shell, 250 g u2013 1 kg |
| u00d82.5 / P4.0 | 2.5 | 4.0 | 1.2 | 35.4 | Drum shell, 1 u2013 5 kg |
| u00d81.5 / P2.5 | 1.5 | 2.5 | 0.8 | 32.6 | Chaff collector |
| u00d83.0 / P5.0 | 3.0 | 5.0 | 1.5 | 32.6 | Cooling tray floor |
Specifying Coffee Roaster Drum & Chaff Screen Beyond the Standard
- Hole size: Below the smallest bean (about 4 mm); 2–2.5 mm is typical.
- Thickness: 1.0–1.5 mm for thermal stability and stiffness.
- Open area: 30–35 % balances airflow and drum strength.
When Coffee Roaster Drum & Chaff Screen Is Not the Right Choice
Not for direct-flame roasting without a solid drum section where uniform conduction is wanted.
