Reverse tuck, rounded flaps
Reverse tuck with radiused tuck flaps, written as arcs in the SVG, DXF and PDF.
- Example size
- 90 × 45 × 160 mm internal
- Blank
- 290 × 311 mm
- Pieces
- 1 blank
- Board choices
- 12 boards, 0.45 to 7 mm
Free to design and to check in 3D. €2.50 for the PDF, €3.50 for the DXF or SVG.
What this box is, in other words
The same cartons as a reverse tuck: cosmetics, tea, small retail goods. The rounded flap slides in without catching a corner, which helps when the carton is opened and closed often.
How it closes. Dust flaps in, closing panel over them, tuck flap down behind the front or back wall. The two free corners of each tuck flap are radiused instead of cut at an angle.
Worth knowing. The radius is as large as the flap allows, just under half the flap length, and is not set by hand. For a corner you size yourself, switch back to angled corners and set the taper.
Also called
rounded tuck flap radius tuck curved tuck flap round corner tuck reverse tuck end folding carton rounded radius curved cosmetics retail
Same construction, different trade. If you came looking for one of those, this is it.
How this one is built
- Reverse tuck (ECMA A20.20.03.01): the top closes from the back, the bottom from the front. Nests more economically on the sheet.
- The tuck flap is 1.90 mm narrower on each side than the closing panel - a full caliper plus clearance - so it slides past the side walls and the glue seam.
- Closing order: dust flaps in, closing panel over them, tuck flap behind the wall.
Board options
The drawing changes when you change the board: thickness compensation is built into every fold, so a 4 mm C-flute blank is not the same shape as a 0.45 mm carton blank.
- F-flute corrugated (0.8 mm)
- E-flute corrugated (1.5 mm)
- B-flute corrugated (3.0 mm)
- C-flute corrugated (4.0 mm)
- EB double wall (4.5 mm)
- BC double wall (7.0 mm)
- SBS / GC1 board 350 gsm (0.45 mm)
- FBB / GC2 board 400 gsm (0.55 mm)
- Kraft / GD2 board 400 gsm (0.50 mm)
- Greyboard 1.0 mm (rigid)
- Prototype board 1.0 mm
- Prototype board 2.0 mm
Questions about this box
- Is a rounded tuck flap a different ECMA code?
- No. ECMA codes the construction, and the corners of the tuck flap do not change it: a reverse tuck with rounded flaps is still A20.20.03.01.
- Do the curves survive in my CAD or cutting software?
- Yes. The DXF is R12 and stores each arc as a bulge on the polyline vertex, the standard R12 way of writing an arc inside a polyline. The SVG uses arc commands and the PDF Bezier curves, so no format turns the curve into short straight pieces.
- Is this dieline free?
- Designing it and folding it in 3D are free and need no account. Downloading it is paid: €2.50 for the PDF to print and measure on paper, and €3.50 for a production file - DXF or SVG - because those are the ones that go to a cutting table.
- What is a dieline?
- The flat drawing a box is cut from. It shows where the knife cuts, where the board is creased to fold, and where it is perforated. A die maker turns it into a steel rule die; a plotter or laser cuts it directly. It is also written as "die line" or "die cut template".
- What file format does a die maker need?
- DXF, almost always. Ours is R12 DXF at 1:1 in millimetres with cut, crease, reverse crease and perforation each on their own layer, which is what a cutting table expects. The SVG is the same geometry for Illustrator, Affinity, Inkscape and laser software.
- Can I use it commercially?
- Yes. The files are yours: modify them, print them, make any number of boxes from them. No attribution and no licence fee, ever.
What you can change
12 parameters on the first screen, 8 more behind advanced settings.
- Dimension mode
- Length (L)
- Width (W)
- Height (H)
- Board caliper (t)
- Top
- Gable rise — Height of the roof above the walls. The height (H) is the wall height.
- Handle panel height
- Hand hole
- Bottom
- Tuck direction
- Tuck flap corners