FEFCO 0202
Overlap slotted box: blank size formula and dieline
Like a regular slotted box, but the outer flaps are long enough to overlap in the middle. The overlap gives a stiffer top and bottom and a seam that can be stapled or glued through two layers. In the generator the overlap is a setting, 25 mm by default.
Blank size calculator
The formula
| Blank length | 2L + 2W + 4t + g |
|---|---|
| Blank height | H + W + 2t + o |
Holds while o ≤ W + t − 2s (beyond that the flaps are full length and it is a 0203).
- L, W, H
- internal length, width and height
- t
- board caliper (3 mm for B-flute)
- g
- glue flap width: 35 mm on corrugated, 15 mm on carton by default
- s
- gap between the flaps where they meet: 3 mm on corrugated, 1 mm on carton by default
- o
- flap overlap: 25 mm by default
Around the box it is the same as a 0201: 2(L + t) + 2(W + t) + g.
Each flap is half the width plus half the overlap: (W + t)/2 + o/2. Two of them and the wall H + t give H + W + 2t + o.
The formula holds while the overlap is less than the width (o ≤ W + t − 2s). Past that the flaps cover the whole top and the box is a 0203.
Example. 300 × 200 × 150 mm inside on B-flute corrugated (t = 3, g = 35, s = 3, o = 25): blank 1047 × 381 mm.
Per board
The same 300 × 200 × 150 mm inside on each board. Thicker board means a bigger blank for the same inside size.
| Board | t (mm) | g (mm) | s (mm) | Blank (mm) |
|---|---|---|---|---|
| F-flute | 0.8 | 35 | 3 | 1038.2 × 376.6 |
| E-flute | 1.5 | 35 | 3 | 1041 × 378 |
| B-flute | 3 | 35 | 3 | 1047 × 381 |
| C-flute | 4 | 35 | 3 | 1051 × 383 |
| EB double wall | 4.5 | 35 | 3 | 1053 × 384 |
| BC double wall | 7 | 35 | 3 | 1063 × 389 |
In the generator
Not to be confused with
- FEFCO 0200
- Half slotted box: flaps on the bottom only, open top.
- FEFCO 0201
- Regular slotted box: the outer flaps meet in the middle.
- FEFCO 0203
- Full overlap box: the outer flaps overlap over the full width.
Questions
- How much should the flaps of an overlap slotted box overlap?
- Common practice is at least 25 mm, about an inch. The generator uses 25 mm and lets you set anything up to the full width.
- When is an OSC better than an RSC?
- When the box is long and narrow, so the flaps of an RSC would only just meet, or when the seam has to be stapled or glued rather than taped.