Polyester Oligomer Deposition Risk & Safe Drop Temperature

Both curves here are engineering approximations with the right shape rather than measured constants for a particular dye system: oligomer release is treated as first order with a doubling interval, and solubility as an exponential in temperature. The absolute masses should be read as indicative, but the comparison the tool is built for - deposit against drop temperature - depends on the shape of the solubility curve rather than on its calibration, and that comparison is robust. Dispersing agents and oligomer-specific auxiliaries raise the effective solubility substantially and are the usual chemical answer where a hot drop is not possible; their effect belongs in the 20 degree solubility figure, which is why it is an input rather than a constant. Reduction clearing removes oligomer already deposited but does nothing about the mechanism, and a machine that deposits every batch will foul its heat exchanger whatever the fabric is cleared with. Texturised and microfibre polyester expose far more surface and release more oligomer than the same weight of flat yarn, so the extractable content should rise with fineness. Nothing here models the oligomer that recrystallises inside the fibre rather than in the bath, which is a different fault presenting as a dull or hazy shade rather than as white specks.