EP 2177651 B1 20111214 - Method for making PTT fibres with improved curling
Title (en)
Method for making PTT fibres with improved curling
Title (de)
Verfahren zur Herstellung von PTT-Fasern mit verbesserter Einkräuselung
Title (fr)
Procédé pour la manufacture de fibres PTT dotée d'un frisage amélioré
Publication
Application
Priority
DE 102008051738 A 20081015
Abstract (en)
[origin: EP2177651A1] The PTT fiber is spun conventionally. In the new process it is stretched at up to 70[deg] C. Following stretching and before entry into the crimping chamber it receives no heat treatment. It is preferably held to a temperature no greater than 85[deg] C. When in the crimping chamber it is heated, reaching a temperature up to 100[deg] C. During crimping it is fixed whilst still in the crimping chamber. The temperature during stretching is up to 60[deg] C and after stretching up to 70[deg] C. The temperature before entry into the crimping chamber is up to 70[deg] C, preferably up to 60[deg] C and most especially between room temperature and 40[deg] C. In the crimping chamber the temperature is up to 95[deg] C, preferably being held in the range 85-90?C. It is then fixed by introducing superheated steam. Before entering the crimping chamber the fibers are preheated to a temperature at least 20[deg] C greater than that after stretching, but to no more than 85[deg] C; further alternative temperature conditions are cited. Steam is used for heating in the crimping chamber. The individual filament titer of the PTT fiber filaments is preferably about 2.4 dtex. 3.9-8.9 crimps/cm are produced, preferably 5.5 crimps/cm. The crimping ratio (delta l/L) is preferably at least 17%. Following fixing, the PTT fibers are cut and used as staple fibers. An independent claim IS INCLUDED FOR the PTT fibers so produced.
IPC 8 full level
D01F 6/62 (2006.01); D01D 5/084 (2006.01); D01F 6/84 (2006.01)
CPC (source: EP)
D01D 5/084 (2013.01); D01D 10/00 (2013.01); D01F 6/62 (2013.01); D01F 6/84 (2013.01); D02G 1/12 (2013.01)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR
DOCDB simple family (publication)
EP 2177651 A1 20100421; EP 2177651 B1 20111214; AT E537282 T1 20111215; DE 102008051738 A1 20100422
DOCDB simple family (application)
EP 09012733 A 20091008; AT 09012733 T 20091008; DE 102008051738 A 20081015