VEGETABLE AND ALUMINIUM COMBINATION TANNAGE: ABOON ALTERNATIVE TO CHROMIUM IN THE LEATHER INDUSTRY
Keywords:
Combination tannage, vegetable, aluminum sulphate, shrinkage temperature, collagenAbstract
Severe restrictions imposed by the pollution control authorities on chromium have forced tanners tolook for possible alternatives that are naturally abundant, easily obtainable, low priced, eco-friendlyand offer competitive tanned leather performances. In this study, the interactions of vegetable andaluminum, with collagens, have been investigated. This type of combination process helps to improvethe shrinkage temperature, percentage of elongation at break, tensile strength, tear strength at 125oC,65.5%, 38 N/mm2, and 98 N/mm, respectively. The combination offers full, soft leathers which have ashrinkage temperature comparable to conventional chrome tanned skins. Among the combinationsystems evaluated, a vegetable pretannage followed by aluminum retannage was better than thealuminum pre-tanning followed by vegetable retannage. Optimal results were obtained when 10%vegetable tannins and 2% aluminum sulphate were used.
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