The causticization process resulted reduction in fabric whiteness, similar fabric absorbency and increased fabric stiffness comparing to the untreated fabric.
Keywords: causticization, regenerated cellulose lyocell, fibrillation, reactive dyes
Fibrils on the surface of lyocell fibres are stripped in causticization process, thus fibre smoothens and swells; reducing pilling and improving colour strength [9, 10].
This paper presents results of an investigation on the the characterization of sodium hydroxide (NaOH) in causticization processes, and its influence on the reactive dyeing of lyocell fabric by exhaust, pad-dry-cure and pad-batch methods.
Pad-batch Causticization: Lyocell fabric was padded with sodium hydroxide (5oBe, 8oBe and 11oBe) at 70% pick-up.
Analysis of Untreated and Causticized Samples: In order to comprehend the effectiveness of causticization process on lyocell fabric, causticized samples by pad-batch method were examined by scanning electron microscopy.
It was demonstrated that during causticization; cross-section of lyocell fibre became spherical and swollen at 8oBe NaOH concentration [Fig.
TJNAMES "OUTSTANDING RESEARCH PAPER." TAPPI JOURNAL has awarded its 2005 Outstanding Research Paper Award to "Presentation of a dry black liquor gasification process with direct causticization
," by Erik Dahlquist of Malardalens Technical University in Vasteras, Sweden, and Andrew Jones of International Paper in Loveland, OH.