Heat, form,
repeat — preciselyPrecut film heated and formed down with air pressure and plug assist — on tooling we design and cut ourselves. The process behind every blister, tray and sealed pack we make.

Thermoforming is the manufacturing process behind most rigid plastic packaging: a thermoplastic film is heated to its forming temperature — soft, but far below melting — and pressed into a mould cavity with air pressure or vacuum. When the film cools against the tool it keeps the cavity's exact geometry. Compared to injection moulding, thermoforming uses far cheaper tooling and thinner material, which is why it dominates blister packaging, trays and lidded food packs. The trade-off is that only one side of the part is tool-defined — which is exactly why tooling quality decides packaging quality.

When film stretches into a cavity, it thins — and it thins most wherever it stretches last, typically deep corners. Plug-assist thermoforming solves this: before the forming pressure is applied, a shaped plug pushes the hot film part-way into the cavity, pre-distributing material toward the areas that will need it. The plug's geometry, stroke and timing are design parameters we engineer per pack. The result is a more even wall — strength in the corners and stiffness in the base — from the same starting gauge, which often means a thinner, cheaper film can do the same job.

Almost any thermoplastic film can be thermoformed, but a handful dominate packaging. PETG is the workhorse: glass-clear, tough, easy to form and seal — the default for retail and medical blisters. APET and rPET add recyclability and recycled content for food trays. PP brings heat resistance, living hinges and mono-material recyclability. CPET is crystallised for oven-ready food trays. Each material has its own forming window, shrinkage and seal behaviour, so the parameter recipe — temperature, time, pressure, plug — is set per material and per tool, and loaded automatically on our line.

Good thermoforming design follows a handful of rules that cost nothing when respected and everything when ignored. Walls need draft — a few degrees off vertical — so the part releases from the tool and stacks without jamming. Inside radii should be generous, at least twice the film gauge, because tight corners are where material thins and stress concentrates. Undercuts are possible but deliberate: they grip a product or click a lid, and the tool must be built for them. The flange — the flat rim around the cavity — must stay flat and wide enough for the seal band. And if trays will be stacked, denesting features are designed in from the start. These rules are baked into our packaging design phase, so the geometry that reaches tooling is already production-ready.

Industrial thermoforming lines usually run roll-fed film — fast, but heavy on setup, web control and floor space. We form stocked precut film sheets with R4 corner radius, located between guide pins in the tool. For the compact format sizes and batch volumes we specialise in, this is faster to change over, safer to handle and produces no web-edge waste. It's also what lets a 3D-printed prototype tool and a production aluminium tool run the same film, on the same machine, with the same recipe structure.

A good thermoformed pack has even wall distribution, sharp but radiused detail, a flat flange for sealing, and dimensions that repeat shot after shot. That comes from four controlled variables: film temperature (the forming window), forming pressure (detail without stress), tool temperature (dimensional stability as the part cools) and the plug (material where it's needed). We verify all four on prototype samples — including wall-thickness measurement on the actual draw — before any production tooling is cut.

Our thermoforming projects start on 3D-printed tooling: the cavity geometry is printed in days, formed on the same machine as production, and the samples are real — same film, same process, same edge. You validate fit and presentation on parts you can hold, not renderings. When the geometry is approved, we CNC-machine the identical CAD in aluminium for production volumes. One geometry, two tools, no translation loss — and because everything happens under one roof in Denmark, an iteration is a conversation, not a shipping loop.

Thermoformed packaging is everywhere once you look: the blister around a toothbrush, the tray under fresh salmon, the insert that holds electronics in place, the sterile tray a surgical instrument arrives in. The process scales across industries because the same cycle — heat, form, cool — adapts through tooling and material rather than through new machinery. In our factory that means retail and medical blisters, food and workpiece trays, sealed MAP packs and ISO 11607 sterile barrier systems all running on the same line — with the compliance level, material and documentation matched to the market each pack serves.

Thermoforming economics are decided by three clocks: the cycle (seconds per shot, set by heating and cooling), the changeover (minutes between products, set by tool swap and recipe load) and the tooling lead time (days or weeks before the first shot exists). Large roll-fed lines win the first clock and lose the other two \u2014 which is why they need huge batches to pay off. Our setup optimises for the second and third: tools swap quickly, auto tool detection loads the right parameters, and 3D-printed tooling puts the first shot days after the CAD is approved. For the batch sizes most products actually live in \u2014 tens of thousands, not tens of millions \u2014 that's the arithmetic that wins.

A thermoformed pack is a precision part, not a rough shell. Cavity dimensions, flange flatness and overall pack height all carry tolerances — and they matter, because a tray that a robot will fill, or a blister that must register in a cartoning machine, has to be the same every time. Repeatability comes from controlling the four forming variables shot after shot and from a rigid, temperature-stabilised tool that doesn't drift as the line warms up. We hold dimensions against the drawing and verify them on production samples, so the pack that passed the first-article check is the pack that keeps arriving. That predictability is what lets downstream automation run without jams — and it is the difference between a sample that looks right and a format that performs in a real filling line.