| Résumé : |
The requirements on the quality of drum dyed leather has increased steadily in recent years.This trend is due to the increasing demand for straight aniline, or only slightly finished leathers.This development is confronted with the increasingly poorer quality of the available rawstock.Efforts should therefore be made to hide grain faults to a large extent already during drum dyeing.The parameters promoting the accentuation of grain faults during the tanning, retanning and dyeing processes were therefore investigated.Comparative trials were carried out to determine the effect of tanning,retanning and dyeing on the coloring of grain faults.Furthermore, the influence of the chemical structure of retanning agents,dyeing auxiliaries and dyes on the quality of the resulting dyeings was investigated.Another part of this paper deals with the application of pigment preparations during drum dyeing.The results of the study show that it is possible to hide grain faults to a certain extent by the use of appropriate retanning and dyeing processes,specific dyeing auxiliaries,selected dyes, and aniline dyes in conjunction with special pigments. |
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Ways and means of hiding grain defects in drum dyeing - Technical note in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXVIII, N° 6 (06/1993)
