We produce two types of Mimosa i.e Powder and Solid Form. In powder form, we have GS and OP (Ordinary Powder). Mimosa is used in Tannery Industries..
Wattle bark is best processed immediately after stripping to deliver a light coloured extract; the older the bark, the darker the colour. Harvesting and stripping is seasonal, and largely depends on rainfall patterns in the country where it is grown. The chopped bark is extracted, using a counter current principle, in autoclaves under pressure at temperatures above 100 degrees celsius.
The tanning action of polyphenols is dependent on the molecular mass and the number of phenolic – OH hydroxyl groups. Mimosa tannins are on average about 1250 units & generally have a good tanning action. Vegetable tannins are classified according to their chemical structure:Pyrogallol or hydrolysable tannins, such as Chestnut and Myrabolam extract. Catechol or condensed tannins, such as Mimosa (or Wattle) and Quebracho extract.
Mimosa extract has the following properties: A pH value of 4,6 – 4,8, A low concentration of salts and acids, A rapid rate of penetration through the pelt, A good stability to enzyme action, which arises from yeast or moulds, which occur in nature and could cause loss of tannin, particularly in pit tannages.
Mimosa extract is obtained from the bark of Black Wattle (Acacia Mearnsii) trees grown in plantations. It takes 7 to 10 years for the tree to grow large enough to be ready for harvesting and stripping of the bark, which is then chipped and extracted under controlled industrial conditions to extract the optimum amount of tannin with the lightest colour range. Mimosa or wattle bark contains about 30% tannin. The wood has other industrial uses.
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