Custom LED Profile Manufacturing Process

Stage 1 – Drawing review

Engineering receives the cross-section drawing, the material requirement, the application and the annual quantity. The review checks extrudability: wall uniformity, enclosed voids, achievable tolerances, snap-fit deflection, and whether any feature needs a secondary operation. Feedback at this stage is free; after tooling starts it is not.

If there is no drawing, a physical sample is enough to reverse-engineer the section. See custom lighting extrusion.

Stage 2 – Profile engineering

The customer’s geometry is converted into a manufacturing geometry. Die swell compensation, draw-down ratio and flow balancing are applied, corner radii are adjusted to what the melt will actually fill, and non-critical dimensions are set to what the process can hold. You receive the adjusted drawing for approval – this is the last point at which changes cost nothing.

Stage 3 – Material selection

Base polymer and grade are locked: PC or PMMA, UV-stabilised or not, flame-retardant class, diffuser masterbatch and haze level, colour standard. Where the fixture has a compliance requirement – UL94, IK impact, UV exposure – it is confirmed here against a grade that actually holds it.

Stage 4 – Tooling design

The die is designed in CAD: manifold geometry, flow balancing across the section, land length by local wall thickness, and any micro-structured optical surface machined into the land. For co-extruded profiles the second melt channel is designed at the same time. The vacuum calibrator is designed in parallel – its cavity is the negative of the finished profile, and its cooling capacity sets the achievable line speed.

Stage 5 – Mold (die) manufacturing

The die is machined from tool steel, assembled, and polished where the profile surface is optical. Optical dies get the most attention here: the land surface finish is transferred directly to every metre of profile. See custom lighting extrusion tooling for how dies are built, trialled and adjusted.

Stage 6 – Prototype and trial

First extrusion runs the new die. Trial material is measured for dimensions, wall thickness, straightness, colour and – for optical profiles – transmission and haze. The die is adjusted and re-tried until the section is right. Samples are sent to the customer for fit and optical approval. This is the gate that prevents expensive rework.

Stage 7 – Production extrusion

Once approved, the profile goes to a production line: dried resin, controlled melt temperature, die, vacuum calibration, symmetric cooling, puller, and cut to length. Line parameters are recorded so repeat runs match the approved sample – particularly important for colour and transmission consistency across orders.

Stage 8 – Cutting and secondary operations

Cut to the specified length and tolerance. Any secondary work – drilling, punching, notching, end machining, printing – happens here. Short cuts and individual sleeving add cost, so it is worth specifying only the length tolerance the assembly actually needs.

Stage 9 – Inspection

Dimensional verification against the approved drawing, visual inspection for die lines, bubbles, sink marks and inconsistent colour, and functional checks where the profile is optical. First article and in-process checks are documented; full dimensional reports are available for production orders.

Stage 10 – Packaging

Profiles are sleeved, boxed and palletised so straight lengths cannot bend in transit. Long or flexible sections are coiled. Packaging is specified with the order because it materially affects damage rates on long profiles.

What you need to supply at each gate

Typical timing

Drawing review and profile engineering take days, not weeks. Tooling design and die manufacture typically run three to five weeks for a standard lighting section, longer for complex co-extruded or optical dies. Standard production lead time once a tool is approved is around 15 days. Minimum order quantity is typically around 200 kg per profile.

Start with the drawing: request a quote, or read how we handle joint development on the OEM / ODM page.