The edge people
touch firstThe formed and sealed pack is punched to its final contour — clean, burr-free and radiused — on matched cutting tools we make and maintain ourselves.

Die cutting is the finishing operation of thermoformed packaging: after forming and sealing, the pack is still attached to the surrounding film — the die cut shears it free to its final outer contour. In a matched punch-and-die setup, a hardened punch drives the pack through a die opening cut to the same contour; the material shears in the narrow clearance between the two edges. One stroke, one finished pack — and because the contour is machined into steel, every pack in the batch has exactly the same outline.

There are two common ways to cut a formed pack. Steel-rule dies — a sharpened band bent to the contour — are cheap and fine for simple shapes and short runs, but the edge quality depends on a knife pressing against a flat plate, and it degrades with wear. A matched punch and die shears the material between two hardened edges with a defined clearance — the method we use for production packs, because it holds a clean, burr-free edge over long runs and lets the cut sit tight against the formed geometry. The precision lives in the clearance: matched to the material and gauge, typically a small fraction of the film thickness.

The classic die cutting defects are burrs — a raised, sharp lip along the cut — and angel hair, fine plastic threads that contaminate the pack and the line. Both are clearance and sharpness problems: too much clearance and the material tears instead of shearing; a dull edge smears it. The remedies are unglamorous and decisive — correct clearance for the material, edges kept sharp, tooling aligned. We make and maintain the cutting tools in-house, so edge quality is inspected and restored on a schedule instead of drifting until someone complains.

Every material cuts differently, and the tool must respect it. PET and PETG are stiff and shear cleanly, but they're notch-sensitive — a rough edge becomes a crack starter, which is why radiused contours matter most here. PP is tougher and more ductile; it resists tearing but demands sharper edges and tighter clearance to avoid stringing. Laminated structures — a sealed pack is always at least two materials — add another dimension: the cut must shear tray and lidding in one stroke without delaminating the joint. Clearance, edge geometry and stroke are therefore set per material system, not per machine — one more reason the cutting tool is built by the people who chose the film.

The cut line is a design feature, not an afterthought. Corners are radiused — our precut film standard is R4 — because sharp cut corners on plastic are a handling hazard and a starting point for cracks. The contour must land at a controlled distance from the seal band, so the pack presents a clean sealed rim. And the pack must register precisely in the cutting station: guide features formed into the part index it to the tool, so the cut lands identically shot after shot. Contour, radii and registration are all decided in packaging design and machined into the tool.

Every die cut produces a skeleton — the film left after the packs are cut free. Handled well, it's a resource: collected clean and sorted by material, thermoforming skeletons are recyclable, and mono-material pack design (a PET tray with PET lidding, a PP tray with PP lidding) keeps the scrap stream clean enough to recycle at value. This is one of the quiet arguments for designing the material system and the cut layout together — which happens naturally when the same house does both.

On our line the cutting station is the last stop of a single flow: the pack is formed, filled, sealed and die-cut on one machine, with the cutting tool part of the same recipe as the forming and sealing tools. Combined tooling builds all three operations into one coordinated set — the same datum, the same registration, no accumulation of tolerance between machines. The result is a finished, labelled, traceable pack coming off one compact line — see combined tooling and the Nova 360.

The die cut does more than free the pack — it's where several retail and handling features are born. Euro hang holes for pegboard display are punched in the same stroke. Easy-open features — a peel corner where the lidding is left unsealed and the cut shapes a grip tab — are a coordination between the seal pattern and the cut line. Rounded card corners, tear notches and stacking cut-outs all live in the cutting tool. Because these features sit at the intersection of forming, sealing and cutting geometry, they're decided in packaging design and built into the matched tool set — not improvised afterwards.

A cutting tool starts as a line in the pack's CAD model — the same model that drives the forming and sealing tools, so all three share one datum. The punch and die are CNC-machined from that contour, hardened, and fitted to their clearance; guide elements are added so the tool registers to the formed pack, not to hope. First-article cuts are inspected for edge quality and dimension before the tool is released, and the tool's maintenance history — sharpenings, shims, shot counts — follows it for life. It's the same discipline as our forming tools: the tool is not an accessory to the machine, it's where the product quality actually lives.

A die cut is only as good as its registration — where the cut lands relative to the formed cavity and the seal band. If the pack shifts even slightly in the cutting station, the contour crops the flange on one side and leaves a wide margin on the other; on a printed lidding, the day-marking drifts out of register. Control comes from datum features formed into the part that index it positively to the tool, and from a punch-and-die alignment that doesn't wander with wear. We hold the cut dimensions against the drawing and inspect first-article parts before release, then monitor edge and position through the run. For packs that feed automated cartoning or robotic handling downstream, that dimensional consistency is not cosmetic — it is what keeps the line from stopping.