B-R03
Four-flap folders — Reference record
A four-flap folder encloses a flat item through an ordered sequence of folds. The overlap arrangement determines access and closure.
| Reference record | Working notes |
|---|---|
| Overview | Four-flap folders |
| Practical example | Number the lower, side and upper flaps on the reference diagram. |
| Limits and interpretation | A closure sketch does not establish the suitability of a board or adhesive. |
| Document control | Reference edition 2026.11 |
Measurements and examples are descriptive, not acceptance criteria.