Validated Reference A temperature and dwell known to give the required set

Reference Temperature deg C

Reference Dwell s

Activation Energy kJ/mol

Polyester setting is typically 90-130

Proposed Condition & Machine The temperature being considered

Proposed Temperature deg C

Heated Chamber Length m

Fabric Width cm

Fabric Weight g/m2

Sublimation Onset of the Shade deg C

Line Speed at the Proposed Temperature

— m/min

Same degree of set, shorter dwell

Rate Ratio, Dwell & What It Buys

Speed Gain over the Reference: — %
Setting Rate Ratio: — x
Equivalent Dwell: — s
Reference Line Speed: — m/min
Margin to Sublimation Onset: — deg C
Degrees per 10% Speed Change: — deg C
Production at the Proposed Speed: — kg/h
Production Gained: — kg/h

The equivalence assumes a single rate-limiting mechanism across the temperature interval, which holds over a modest range around a validated reference and fails if extrapolated far. It says nothing about whether the proposed temperature is safe for the shade, the fibre blend or any finish already on the cloth - the sublimation margin is reported as a check but is entered by the user, not derived. Dwell is taken as chamber transit time and therefore overstates the time actually spent at temperature, by more on heavy or wet fabric; a reference calibrated on the same machine and article absorbs the difference. Activation energy should be fitted from two measured iso-setting points on the plant own data rather than taken from the default. Heat transfer, air velocity and the moisture the fabric carries in are all outside the model.

Heat-Setting Time-Temperature Equivalence & Line Speed Trade — free, with the formula and a worked example, at Textile School.