Die Cutting
Die cutting presses a shaped steel rule or rotary die through sheet stock, cutting flat outlines in paper, board, foam, film and textile.
- Part
- Cutting
- Revised
- 2026-08-11
At a glance
- Family
- Mechanical
- Typical tolerances
- ±0.010–0.030 in (±0.25–0.75 mm) for steel rule dies; ±0.005–0.015 in (±0.13–0.4 mm) for rotary and hardened punch-and-die tooling; print-to-cut registration typically ±1/32 in (±0.8 mm)
- Typical volumes
- Digital knife 1–500; steel rule 500–500,000; rotary dies 100,000+
- Lead time
- Steel rule dies in 2–5 business days; rotary dies 2–4 weeks; digital knife cutting same day
- Materials
- Plastic, Composite, Wood
What it is
Die cutting presses a shaped blade through sheet stock to cut a flat outline, and covers three tooling families that behave quite differently. Steel rule dies — hardened rule bent to shape and set into a plywood board — cut paper, board, corrugated, foam, rubber, gasket material, film and textile on a flatbed or clamshell press. Rotary dies, either flexible plates or solid engraved cylinders, do the same work continuously from a web at high speed. Digital knife cutting does it with a drag or oscillating blade and no tooling at all.
Standard 2-point steel rule is 0.028 in (0.7 mm) thick, which sets the cut width, and US die height is conventionally 0.918 in. Tolerance runs ±0.010–0.030 in (±0.25–0.75 mm) for steel rule and tighter for rotary and hardened tooling.
Tooling is cheap and arrives in days rather than weeks, which is why die cutting owns packaging, gaskets and converted materials.
How it works
- Die construction. A die board, typically 3/4 in (18 mm) plywood, is laser-cut with a narrow kerf following the part outline. Steel rule is bent to shape and driven into that kerf, and ejection rubber is bonded alongside every rule to push the material back off the blade after the cut.
- Cutting rule versus creasing rule. Cutting rule has a sharpened edge and severs the material. Creasing rule is blunt and rounded, and works against a matrix channel on the opposite platen to compress a fold line into board without cutting it — the reason a folding carton bends where it is supposed to.
- Press selection. Flatbed platen presses suit short runs, heavy board and thick gasket stock; rotary presses run continuously from a web at high speed for labels, cartons and adhesive-backed parts.
- Makeready. Packing is built up under the die until every rule cuts to the same depth across the whole sheet. This is the operator skill in the process and the reason a first-off sheet is not the same as the hundredth.
- The stroke. The rule penetrates against a hardened cutting plate, or against the anvil roll in a rotary press. Rule that cuts too deep destroys the cutting plate; too shallow and parts do not separate.
- Nicks and bridges. Small gaps left in the rule leave the part attached to the surrounding sheet so it can travel through the press without falling out, then break free at stripping.
- Stripping and blanking. Waste is pushed out of the sheet and parts are separated, either in-line on a production press or by hand on short runs.
Design guidelines
Plan nicks where they will not show
Every nick leaves a small witness on the part edge. Place them on non-visible edges, away from sealing surfaces and away from corners, and tell the die maker where they are acceptable rather than leaving it to chance.
Minimum feature size
Steel rule dies cut holes and internal features down to about 0.125 in (3 mm), and rule-to-rule spacing should also stay at or above 0.125 in (3 mm) so the die board retains strength between kerfs. Smaller holes need a punch inserted into the die rather than bent rule.
Design creases with the grain
Paperboard folds cleanly parallel to the grain direction and cracks when folded across it. Lay out cartons so the primary folds run with the grain, and expect the crease geometry — matrix channel width and depth — to be selected from the board caliper and rule thickness by the die maker.
Allow for registration on printed work
Print-to-cut registration is typically around ±1/32 in (±0.8 mm). Add bleed to any printed area that runs to a cut edge, and keep critical graphics away from the trim.
Match the tooling family to the volume
Digital knife cutting has no tooling at all and suits samples and short runs. A steel rule die pays for itself over a few hundred to a few thousand pieces. A rotary die is a larger investment justified by continuous web production in the hundreds of thousands.
Respect material thickness limits
Steel rule handles most converted materials up to roughly 0.125 in (3 mm); thicker foam and rubber need taller rule and more press tonnage, and compressible materials cut with a slight edge crush that has to be acceptable.
| Material | Die cutting suitability | Notes |
|---|---|---|
| Paperboard, folding carton | Excellent | Cut and crease in one stroke; mind grain direction |
| Corrugated board | Excellent | Rotary dies for volume, flatbed for heavy flute |
| Foam (PE, PU, EVA) | Excellent | Compressible edge; taller rule for thick stock |
| Rubber and gasket sheet | Excellent | Cork, neoprene, silicone; a core gasket process |
| Adhesive-backed film and label stock | Excellent | Kiss-cutting through the face only, leaving the liner intact |
| Thin plastic film and sheet | Good | Brittle films crack; warmer stock cuts better |
| Textiles, felt, leather | Good | Fraying is the design constraint, not the cut |
| Sheet metal | Not applicable | Use punching and blanking |
| Feature | Recommended | Limit | Why |
|---|---|---|---|
| Material thickness | ≤ 0.125 in (3 mm) | Taller rule for thick foam | Rule height and press tonnage |
| Minimum hole | 0.25 in (6 mm) | 0.125 in (3 mm) | Bent rule cannot hold a smaller shape |
| Rule-to-rule spacing | ≥ 0.25 in (6 mm) | 0.125 in (3 mm) | Die board strength between kerfs |
| Cut width (kerf) | 0.028 in (0.7 mm) | Rule thickness | 2-point rule is standard |
| Print-to-cut registration | ±1/32 in (±0.8 mm) | — | Add bleed on printed edges |
| Corner radius | ≥ 0.06 in (1.5 mm) | Sharp | Rule cannot bend to a sharp point cleanly |
Cost drivers
Die cutting is priced as cheap tooling plus fast press time, so the questions are how many tooling families you need and how well the part nests.
Tooling family. A steel rule die is inexpensive and delivered in days. A rotary die costs considerably more and takes weeks, but runs continuously. Digital knife cutting eliminates tooling entirely at a much lower throughput.
Sheet yield. Cost per part tracks how many parts fit on a sheet or across a web width. A part sized to fit the standard sheet or web with minimal trim can be dramatically cheaper than one that wastes a strip on every pass.
Makeready. Setting the die and building packing so every rule cuts evenly is a fixed cost per run, which is why short runs carry a high per-part price and long runs do not.
Material. On packaging and gasket work, the substrate is frequently the largest single line item, so board caliper and grade choice matters more than the cutting.
Secondary operations. Stripping waste, blanking, gluing and folding are separate steps priced separately.
Four ways to take cost out:
- Size the part to the standard sheet or web width before finalizing dimensions.
- Use digital knife cutting for prototypes and design changes; commit to a die once the geometry is frozen.
- Combine multiple part numbers onto one die where they share material and caliper.
- Keep internal features at 0.125 in (3 mm) and above so bent rule can make them without inserted punches.
Questions
6 questionsWhat is the difference between a steel rule die and a rotary die?
A steel rule die is hardened rule bent to shape and set into a plywood board, used flat in a platen press; it costs little and arrives in days. A rotary die is a cylinder — flexible plate or solid engraved steel — that cuts continuously from a moving web at much higher speed, costs considerably more and takes weeks to make. Volume decides which one is right.
What tolerance can die cutting hold?
±0.010–0.030 in (±0.25–0.75 mm) for steel rule dies, tightening to ±0.005–0.015 in (±0.13–0.4 mm) for rotary and hardened punch-and-die tooling. Print-to-cut registration on printed work is typically around ±1/32 in (±0.8 mm), which is why printed areas running to a cut edge need bleed.
What is the smallest hole a steel rule die can cut?
About 0.125 in (3 mm), and rule-to-rule spacing should stay at or above the same figure so the die board keeps its strength between kerfs. Smaller holes require a hardened punch inserted into the die rather than bent rule, which adds cost but is entirely routine.
What is the difference between cutting rule and creasing rule?
Cutting rule has a sharpened edge and severs the material. Creasing rule is blunt and rounded and works against a matrix channel on the opposite platen, compressing a fold line into the board without cutting through it. A folding carton die carries both, which is how the blank is cut and its fold lines formed in a single stroke.
Why does grain direction matter in die cutting board?
Paperboard folds cleanly parallel to the grain and cracks along the crease when folded across it. Carton layouts should therefore orient primary folds with the grain. It is a layout decision made before tooling, and it cannot be corrected in the press.
What are nicks and why are they in my part?
Nicks, or bridges, are small gaps deliberately left in the cutting rule so the part stays attached to the surrounding sheet as it travels through the press, then breaks free at stripping. Each leaves a small witness on the edge, so specify where they are acceptable — on non-visible edges, away from sealing surfaces and away from corners.