Heating defect
Scorching & burn marks in thermoforming
Also called: Overheating, discolouration
Scorching is heat damage — yellowing, brown marks, glossiness or surface degradation — where the sheet was overheated, held too long, or sat too close to a heater element.
Why it happens
- Oven temperature or dwell time too high
- Sheet too close to heater elements
- A stalled cycle leaving the sheet in the heat
- Localised heater hot spots
How to fix & prevent it
- Dial temperature and dwell to the material window
- Set correct sheet-to-heater distance
- Guard against cycle stalls; add sensing
- Balance heaters to remove hot spots
How Indu prevents it: Zoned heaters with temperature sensing and controlled cycles keep each grade inside its heat window, avoiding scorch and colour shift.
Troubleshooting help
Fighting scorching & burn marks on a part?
Send your drawing, sample or a photo of the issue — our engineers will diagnose the cause and reply with the tooling, material and process fix, usually within 24 hours.
ISO 9001:2015 certified · Most quotes back within 24 hours