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Rongal A in Flash Ageing
Author(s) -
Küppers W.
Publication year - 1962
Publication title -
journal of the society of dyers and colourists
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 49
eISSN - 1478-4408
pISSN - 0037-9859
DOI - 10.1111/j.1478-4408.1962.tb02469.x
Subject(s) - steaming , padding , alkali metal , hydrogen peroxide , chemistry , sodium hydroxide , acetic acid , materials science , composite material , chemical engineering , organic chemistry , food science , engineering
The properties of Rongal A are described and compared with those of sodium hydrosulphite. These properties are then discussed in relation to the padding process, padding mangles of various types, bowl hardness, the path followed by the material, and the low liquor pick‐up. The steaming process is thon considered and the importance of avoiding working with wet steam is stressed. The use of contact heating is also mentioned. The main part of the paper deals with oxidation and removal of alkali from the material. Oxidation with hydrogen peroxide, possibly stabilised with acetic acid, not only leads to a high consumption of chemicals, but also very frequently gives rise to fluctuations in colour. With regard to aftertreatment in rope form, it is observed that satisfactory oxidation is obtained with water alone and that effective removal of alkali results from prolonged immersion in the winch beck. At the same time much of the thickening agent is removed. The chemical‐free oxidation and removal of alkali from fabrics in open‐width is also considered.