Process for pre-tanning and tanning skins with organic tanning agent

A rawhide and pre-tanning technology, applied in the field of tanning, can solve the problems of lengthening the overall tanning process and environmental impact, and achieve the effects of avoiding mechanical strength and excessive relaxation.

Active Publication Date: 2011-04-13
RHODIA OPERATIONS SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] These pickling treatments not only lengthen the overall tanning process, but also have an environmental impact as they result in tannery effluents, often with high salt concentrations, that must be disposed of
These pickling treatments also place a burden on the tannery in terms of acid and salt required

Method used

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  • Process for pre-tanning and tanning skins with organic tanning agent
  • Process for pre-tanning and tanning skins with organic tanning agent
  • Process for pre-tanning and tanning skins with organic tanning agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0121] Pre-tanning of wet white lamb skins at low temperatures using aqueous degreasing

[0122] method

[0123]

[0124] result

[0125] Independent analysis of the wet white lamb skins obtained gave the following results (determined by using the BS 1309 test method):

[0126] 3.9% oil (target is <5%)

[0127] • 0.62% free fatty acids (target is <1%).

[0128] in conclusion

[0129] The inventive method, which does not require an acid leaching stage and performs aqueous degreasing at low temperatures, gives good results both in terms of grease levels and free fatty acid levels, both of which are significantly below the target values.

Embodiment 2

[0131] Pre-tanning of wet white lamb skins at high pH (directly after deliming - no pH adjustment)

[0132] method

[0133]

[0134]

[0135] result

[0136] Analysis of the wet white lamb skins obtained gave the following results (determined by using the BS 1309 test method):

[0137] - 0.43% residual free fatty acid (target is <1%).

[0138] in conclusion

[0139] The process of the invention without the pickling stage and with pretanning at high pH (i.e. avoiding the need for pH adjustment steps before and after pretanning and the associated use of acids and bases) gave good results in terms of free fatty acid levels, significantly lower than the target value.

Embodiment 3

[0141] Tanning of cowhide

[0142] method

[0143]

[0144]

[0145] result

[0146] THPx successfully tans hides and hides directly from deliming and softening without the need for a pickling step.

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PUM

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Abstract

The invention relates to a process for pre-tanning skins comprising the steps of liming and washing the skins; deliming, bating and washing the skins; adjusting the pH, if required; pre-tanning the skins; and adjusting the pH, if required; wherein the step d) of pre-tanning the skins involves treating the skins with one or more organic tanning agent; and one or more stabilising agent, wherein the skins are treated with the stabilising agent after being treated with the tanning agent; application of the process to to methods of tanning, in particular methods of pre-tanning and tanning that do not require a pickling step.

Description

technical field [0001] The present invention relates to tanning methods, especially pretanning and tanning methods which do not require a pickling step. Background technique [0002] Tanning is a method of preserving skins, the collagen-containing outer hides of vertebrates, including mammals (such as cows, pigs, deer, goats, sheep, seals, antelope, mink, white ferrets and camels), fish (such as sharks), reptiles (such as snakes, lizards, and crocodiles), and birds (such as ostriches). Rawhide includes a layer of collagen, and tanning means reacting the collagen with a cross-linking agent or tanning agent to cross-link the active sites within the collagen molecule. The cross-linked product is leather, which is much less susceptible to bacterial degradation than raw hides. [0003] As a result of crosslinking, the minimum temperature at which wet leather tends to shrink is increased. This shrinkage temperature is often used as a measure of the degree of tanning. [0004] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C3/18C14C3/28
CPCC14C3/18C14C3/28
Inventor G·科林斯C·琼斯K·普里查德
Owner RHODIA OPERATIONS SAS
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