![]() ![]() ![]() Vegetable tanning is the oldest tanning method. We can divide leather tanning chemicals in four groups: It is however not yet ready to be used for the production of a leather items, such as a shoe, a bag or a leather chair. Once a hide or pelt has been tanned, it is considered leather. It is now a durable material and protected against chemicals, moisture and microorganisms. The network of elastin fibers, which are insoluble in the highly alkaline conditions of liming, should now be evenly relaxed and flattened through the extended action of suitable enzyme preparations.Īcids are added to slacken the pelt and enhance penetration of the tanning agent.īy using a tanning agent the collagen structure of a pelt is being altered and converted into a leather intermediate. Additional care must be taken to adequately buffer the de-liming bath and avoid the precipitation of soluble proteins through a rapid drop in float pH. This is done most effectively using proprietary organic acids and acid-salts which form highly soluble lime complexes. The pelt requires an efficient and complete removal of lime and the neutralization of residual alkalinity, after fleshing and/or splitting. #Tanning hides skinFrom this stage the skin is often referred to as a pelt. This enables the lime to penetrate and diffuse evenly through the pelts, for optimal fibre splitting and separation. Here, lime is typically added before alkaline swelling occurs from subsequent additions of sodium sulphide and sodium hydrosulphide. Hair saving or semi-hair saving systems yield particularly good results. The goal of liming is to split the fibre bundles and to remove any unwanted hair from the hide through the introduction of alkali. All non-leather making components should be removed from the hide to prepare for the production a clean and flat pelts. Soaking is done to remove any excess salt or dirt. Depending on the type of hide and intent of usage, these are the steps of leather tanning: ![]() Leather tanning turns a hide into leather. How does the leather tanning process work? ![]()
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