Difference between revisions of "Neutralising"

From www.leather-dictionary.com - The Leather Dictionary
Jump to: navigation, search
m
Line 4: Line 4:
  
  
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.
+
Acids which have penetrated into the leather during [[tanning leather|tanning]] are removed 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]]. There are no attempts to bring the [[pH value]] of leather to 7 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.
  
  
 
== [[Leather videos|Video]] about the [[leather production]]==
 
== [[Leather videos|Video]] about the [[leather production]]==
 
<p align=center>
 
<p align=center>
<flashow>http://www.youtube.com/v/zbj1QicTdpI&fs=1&color1=0x660000&color2=0x550000&border=1|width=500|height=281,25</flashow><br></p>
+
<flashow>//www.youtube.com/v/zbj1QicTdpI&fs=1&color1=0x660000&color2=0x550000&border=1|width=500|height=281,25</flashow><br></p>
 
<p align=center>
 
<p align=center>
 
''The [[leather production]] in a modern [[tannery]].''
 
''The [[leather production]] in a modern [[tannery]].''
Line 22: Line 22:
 
! bgcolor=#eeeeee | [[Leather production|Process steps in the leather production]]
 
! bgcolor=#eeeeee | [[Leather production|Process steps in the leather production]]
 
|-
 
|-
| bgcolor=#ffffff align=center | [[storage of leather|storage]] - [[soaking]] - [[Liming - Leather Tanning|liming]] - [[Fleshing - Making of leather|fleshing]] - [[Split leather|splitting]] - [[pickling]] - [[Tanning leather|tanning]] - neutralising - [[Drying leather|withering]] - [[Leather production#Sorting|sorting]] - [[shaving]] - [[Leather production#Dyeing (through colouring) and fatliquoring|dyeing (through colouring) and fatliquoring]] - [[Drying leather|drying]] - [[finish]] - [[softening]] - [[Leather quality|final check]]
+
| bgcolor=#ffffff align=center | [[storage of leather|Storage]] - [[soaking]] - [[Liming - Leather Tanning|liming]] - [[Fleshing - Making of leather|fleshing]] - [[Split leather|splitting]] - [[pickling]] - [[Tanning leather|tanning]] - neutralising - [[Drying leather|withering]] - [[Leather production#Sorting|sorting]] - [[shaving]] - [[Leather production#Dyeing (through colouring) and fatliquoring|dyeing (through colouring) and fatliquoring]] - [[Drying leather|drying]] - [[finish]] - [[softening]] - [[Leather quality|final check]]
 
|}
 
|}
 
</center>
 
</center>

Revision as of 09:41, 19 April 2017

LEATHER-DICTIONARY.jpg


Acids which have penetrated into the leather during tanning are removed during the neutralising stage. Alkaline sodium carbonate is used in a concentration of 1.2%. Neutralising is necessary, to allow fat-liquoring. There are no attempts to bring the pH value of leather to 7 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