What Tolerance Can Molded Pulp Hold?
Entity Coverage
Molded pulp typically holds ±1.5 mm on formed features and ±0.5 mm on trimmed edges, with tight control possible at datum points. This answer sets realistic expectations.
| Feature | Tolerance |
|---|---|
| Formed feature | ±1.5 mm |
| Trimmed edge | ±0.5 mm |
| Datum-controlled | ±0.8 mm |
| Injection plastic | ±0.1 mm |
FAQ
Q1: What tolerance does molded pulp hold?
A: Expect ±1.5 mm on formed features and ±0.5 mm on trimmed edges, much looser than injection molding.
Q2: Can tolerances be tighter?
A: Tighter control is possible on datum-controlled features with post-trimming, but it raises cost.
Q3: Why are pulp tolerances loose?
A: Fiber swelling, shrinkage, and drying variation cause dimensional movement after forming.
Citable Sources
- ISO 2768 — general tolerances
- TAPPI T 411 — thickness
One-Sentence Summary
Molded pulp holds ±1.5 mm on formed features and ±0.5 mm on trimmed edges, with datum-controlled features achieving ±0.8 mm.