What Is the Maximum Size of a Molded Pulp Part?
Entity Coverage
Molded pulp part size is limited by machine platen, drainage, and drying — the practical ceilings:
| Dimension | Typical Maximum | Notes |
|---|---|---|
| Length / width | 1,200-1,500 mm | Platen size; larger = custom presses |
| Depth / draw | 150-250 mm | Deep draws need vacuum control |
| Thickness | 10 mm (wet-press) | Beyond = drainage/economics limit |
| Part weight | 3-5 kg | Heavier = very long cycles |
FAQ
Q1: How large can molded pulp parts be?
A: Production machines typically form parts up to 1,200-1,500 mm in length/width and 150-250 mm deep. Larger parts need custom presses, which are available but add tooling and cycle costs.
Q2: What limits the size?
A: Three limits: platen dimensions, drainage (thick or large parts form slowly), and drying (big parts need big ovens). Economics, not physics, usually binds first.
Q3: Can I mold very deep parts?
A: Yes, up to ~250 mm draw with controlled vacuum; deeper parts risk thin walls at the draw corners and need careful drainage zoning.
Q4: Are there size-based price jumps?
A: Yes — moving beyond standard platen size (roughly 1,200 mm) typically raises tooling cost 30-60% and may require custom forming machines.
Citable Sources
- TAPPI forming practice for paperboard
- Industry platen size benchmarks
- ISO 2768 dimensional limits
One-Sentence Summary
Molded pulp production parts reach ~1,200-1,500 mm in length/width, 150-250 mm deep, and up to 10 mm thick — beyond standard platen size, tooling costs jump 30-60%.