Author: Site Editor Publish Time: 2025-12-01 Origin: Site
Last updated: October 15, 2026
Quartz IR lamps can be evaluated as part of an electrostatic powder-coating line when the production team needs better control of a defined heating stage. The starting point is the powder specification and the temperature history of real parts. Lamp power, oven air temperature and a glossy-looking surface do not, on their own, establish that a coating is fully cured.
This guide focuses on the engineering work behind a preheat, gel or cure trial: separating the process stages, locating cold and hot areas, and recording enough information to repeat an accepted recipe. For a broader introduction to the technology, read the advantages and limitations of infrared powder-coating lamps.
The word “drying” can describe different jobs around a powder line. Define the job before comparing emitters or changing the conveyor speed. This article concerns heat-curing thermoset powder coatings; other coating technologies require their own process instructions.
| Stage | Question to resolve | Evidence for the trial |
|---|---|---|
| Dry-off after pretreatment | Is the prepared component ready for the next specified operation? | Pretreatment instructions and an agreed dryness check, including water-retaining features. |
| Preheating | Where does the proposed heat input sit in the approved sequence? | Part temperature at coating application or at entry to the following heating stage. |
| Gelling after powder application | Has the powder reached the intended intermediate film condition? | Supplier-agreed gel assessment and the continuing temperature profile. |
| Final cure | Does the complete process satisfy the formulation's requirements? | Recorded part-temperature history and specified coating-quality checks. |
A successful intermediate stage still needs to be assessed as part of the whole coating process. In particular, a gelled surface is not the release criterion for a part that requires further curing.
Obtain the technical data sheet for the exact powder product and the supplier's interpretation of its cure window. Confirm which temperature is specified, how the associated time is assessed, and what limits apply to repeated heating or multiple coating layers.
For example, the Interpon D1036 Matt technical data sheet identifies its curing schedule as an object-temperature requirement. That illustrates why the oven-air display cannot be substituted for the coated workpiece temperature. The schedule for that particular powder must not be transferred to a different formulation.
Write the agreed acceptance conditions into the trial plan before selecting a nominal lamp setting. Include the coating's appearance and film-performance requirements alongside the thermal limits, so that a faster heating curve is judged against the same finished-product requirement.
Choose parts that expose the limits of the current process: a thick section, a thin edge, a recessed face and a heavily loaded rack position. Include the actual hanger arrangement. A convenient flat panel can help compare trials, but it cannot stand in for every production geometry.
Use securely attached, suitable temperature sensors and an appropriate recording method to follow the parts through the line. Agree sensor attachment and interpretation with the process specialist. Label each measurement location on a drawing or photograph; a temperature trace without its physical location is difficult to use during troubleshooting.
Record the air-temperature setting separately from each part trace. If non-contact temperature measurement will control production, validate its readings against the agreed reference method on the actual surface and installation before relying on it for release decisions.
Sketch the proposed lamp-to-part geometry, including brackets, flanges and neighbouring components. Surfaces hidden from the emitter need a separate assessment; adding power at the exposed face does not demonstrate adequate heating inside a recess. A different orientation, part movement or a combined IR and convection trial may be worth evaluating.
For an IR boost ahead of an existing oven, record the temperature entering the oven and the profile through the remaining zones. Keep the original validated process as the comparison. Shortening the following dwell time should be a separate controlled trial, with the same coating acceptance checks.
Record emitter arrangement, heated length, reflector orientation, working distance and zone settings. Include rack density, part orientation, powder product, film thickness and colour. Use these as trial variables rather than assigning a universal short-wave or medium-wave recipe to every powder.
Define the response to a stopped conveyor, an absent part, a sensor fault or lost ventilation with the equipment integrator. The normal production recipe and the fault response require separate review. The heating systems and controls category provides an entry point for identifying the components to discuss.
The following fields form a practical record for comparing candidate arrangements. They are information to collect, rather than proposed values or a completed customer case.
| Record | What to enter |
|---|---|
| Coating and substrate | Powder product, TDS revision, batch, colour, film thickness, material and section thickness. |
| Loading and heating | Rack layout, orientation, conveyor speed, zone arrangement, distance and power settings. |
| Temperature evidence | Sensor locations, complete traces and the comparison with supplier-approved cure conditions. |
| Quality evidence | Specified test method, acceptance criteria, result and the person releasing the trial. |
| Decision and limits | Accepted product family, operating range, exceptions and the changes that require revalidation. |
PPG's powder-coating technical FAQ explains that cure curves are formulation-specific and that production conditions need verification. It also distinguishes quick cure checks from the wider qualification and quality-assurance process. Select tests with the powder supplier and the customer's specification rather than treating one generic rub test as a universal pass.
Repeat the accepted arrangement across the representative part and rack conditions. Retain failed results as well as passes. They help define where a recipe stops being valid and prevent a later production change from silently exceeding the tested conditions.
Start with the stage being changed, the limiting part locations and the required thermal profile. Include available supply, installation space, mounting constraints, control interface and maintenance access. If replacing a lamp, add its drawing, electrical rating, heated length, terminal details and reflector orientation.
Review the infrared lamp range, then send the drawings, powder TDS and trial requirements for an application review. State which data are measured and which are still to be confirmed. A lamp quotation and an accepted coating process are separate project decisions.
The relevant evidence is the part's recorded temperature history assessed against the exact powder's requirements, together with the specified coating checks. Keep the air setpoint in the record as an operating condition.
Only after the complete revised sequence has been validated. Check the locations most likely to heat slowly and the locations most likely to overheat, including the following oven stages.
Group parts by demonstrated process behaviour. Geometry, loading, coating and section thickness belong in the recipe record; a catalogue setting alone does not establish their acceptable operating range.
