Difference between revisions of "Neutralising"

From www.leather-dictionary.com - The Leather Dictionary
Jump to: navigation, search
m
Line 4: Line 4:
  
  
When neutralizing, the acid, which has penetrated into the leather during [[tanning leather|tanning]], is removed again. Alkaline sodium carbonate is used in a concentration of 1.2%. Neutralizing is necessary, to allow the later [[Oils & fats in the leather industry|fat-liquoring]]. A neutral [[pH value]] in the leather of 7 is not attempted, since this would dissolve the binding of the [[tannins]] to the skin-fibres and thus drastically reduce the [[leather quality|durability]] of the leather. In practice, a pH value of 4-6 is desired.
+
Acids which have penetrated into the leather during [[tanning leather|tanning]], is removed again during the Neutralising stage. Alkaline sodium carbonate is used in a concentration of 1.2%. Neutralising is necessary, to allow [[Oils & fats in the leather industry|fat-liquoring]]. No attempts to bring the [[pH value]] of leather to 7 are made during this stage, since this would dissolve the binding of the [[tannins]] to the skin-fibres and thus drastically reduce the [[leather quality|durability]] of the leather. In practice, a pH value of 4-6 is desired.
  
  

Revision as of 08:17, 12 February 2017

LEATHER-DICTIONARY.jpg


Acids which have penetrated into the leather during tanning, is removed again during the Neutralising stage. Alkaline sodium carbonate is used in a concentration of 1.2%. Neutralising is necessary, to allow fat-liquoring. No attempts to bring the pH value of leather to 7 are made during this stage, since this would dissolve the binding of the tannins to the skin-fibres and thus drastically reduce the durability of the leather. In practice, a pH value of 4-6 is desired.


Video about the leather production


The leather production in a modern tannery.



Process steps in the leather production
storage - soaking - liming - fleshing - splitting - pickling - tanning - neutralising - withering - sorting - shaving - dyeing (through colouring) and fatliquoring - drying - finish - softening - final check


Tanning methods
Chrome tanning - Vegetable-tanned leather - Synthetic tanning - Tanning with fats and oils


Colourlock-GB-03.jpg

WE UNDERSTAND LEATHER - WWW.COLOURLOCK.COM