To cut hundreds or thousands of boxes, nobody trims each sheet with a craft knife. Instead, a tool is built: the cutting die, which cuts and creases every box on the sheet in a single press stroke.
What is a cutting die made of?
- A base board of thick plywood, laser-cut with slots that follow the lines of the dieline exactly.
- Cutting rules: steel blades bent to shape and inserted into the cutting slots.
- Creasing rules: round-edged rules, slightly lower, that press the board without cutting it.
- Perforating rules: notched blades for tear-off sections.
- Ejection rubber, glued along the blades: it pushes the board off after cutting so it doesn’t stay stuck.
On the opposite side, on the press’s counter plate, a creasing matrix provides a small channel under each creasing rule. Its width depends on the board thickness, and it’s what gives you a clean fold without cracking.
Nicks (tie points)
If every box were cut completely free, the sheet would fall apart inside the machine. So the die maker leaves tiny nicks (small notches ground into the blades) that hold the boxes in the sheet. They are broken during stripping. Their position is chosen so they don’t show on an important panel.
Flatbed, rotary or digital cutting table
| Process | Tool | Best for |
|---|---|---|
| Flatbed die cutter | Flat die (plywood and rules) | The most common setup: short and long runs of folding cartons and boxes. |
| Rotary die cutting | Cylindrical die | Very long runs, mostly in corrugated board. |
| Digital cutting table | No tool: a blade and a creasing wheel follow the file | Prototypes, samples, short runs. |
Why the dieline must be right from the start
A die is built for one dieline, at one size, for one board thickness. Changing a dimension by a single millimeter often means a new die. That’s why it pays to validate the dimensions on a mockup (or on a sample cut on a digital table) before you order the tool.
The die maker works from the dieline alone: a DXF or PDF file at 1:1 scale, with no artwork and with clean lines clearly separated by type. A well-made die can be stored and reused for every repeat order of the same box.