Polytrimethylene terephthalate (PTT)
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Ř PTT filament yarns at similar dtex per filament are softer than PET – they are as soft as PA
comparison (+2 best/ -2 worst):
Ř A PTT 3 dtex per filament is as soft as a PET with 2 dpf
Ř Fine filaments are less resilient, a compromise between stretch and softness is necessary.