ECMA B10.02.00.00 Four-double-wall tray, expansion piece

Length (A) Width (B) Height (H) Thickness

Nicks

12×24 mat — 9.63″ × 11.63″

Unglued selflocking tray with 4 double walls; locking flaps system with fold over ends with expansion piece. Every wall is a flat strip that folds back on itself twice, then hooks into its neighbour at each corner through a steep notch — not a diagonal web, a near-vertical dogleg the catalogue drafts at 15° and this build takes as a quarter of the wall height. A slit at each base corner frees the strip to make that turn without tearing where the base crease would otherwise hold it. Nothing locks; the wrap itself is the grip, which is what the catalogue calls the expansion piece. ECMA catalogue, p.36 ↗