Difference between revisions of "Neutralising"
From www.leather-dictionary.com - The Leather Dictionary
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| − | + | 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. | |
| − | == [[ | + | == [[Leather videos|Video]] about the [[leather production]]== |
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| − | <flashow>//www.youtube.com/v/ | + | <flashow>//www.youtube.com/v/zbj1QicTdpI&fs=1&color1=0x660000&color2=0x550000&border=1|width=500|height=281,25</flashow><br></p> |
| − | </p> | + | |
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| − | ''[[ | + | ''The [[leather production]] in a modern [[tannery]].'' |
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{| {{Prettytable}} | {| {{Prettytable}} | ||
| − | ! bgcolor=#eeeeee | | + | ! bgcolor=#eeeeee | [[Leather production|Process steps in the leather production]] |
|- | |- | ||
| − | | bgcolor=#ffffff align=center | [[ | + | | bgcolor=#ffffff align=center | [[storage of leather|storage]] - [[soaking]] - [[Liming - Leather Tanning|liming]] - [[fleshing]] - [[Split leather|splitting]] - [[pickling]] - [[Tanning leather|tanning]] - neutralising - [[Drying leather|withering]] - [[Leather production#Sorting|sorting]] - [[shaving]] - [[Leather production#Dyeing (through colouring) and fatliquoring|yeing (through colouring) and fatliquoring]] - [[Drying leather|drying]] - [[finish]] - [[softening]] - [[Leather quality|final check]] |
|} | |} | ||
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{| {{Prettytable}} | {| {{Prettytable}} | ||
| − | ! bgcolor=#eeeeee | | + | ! bgcolor=#eeeeee | [[Tanning leather|Tanning]] methods |
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| − | | bgcolor=#ffffff align=center | [[ | + | | bgcolor=#ffffff align=center | [[Chrome tanned|Chrome tanning]] - [[Vegetable-tanned leather]] - [[Synthetic tanned|Synthetic tanning]] - [[Tanning with fats and oils]] |
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Revision as of 11:05, 5 February 2017
When neutralizing, the acid, which has penetrated into the leather during tanning, is removed again. Alkaline sodium carbonate is used in a concentration of 1.2%. Neutralizing is necessary, to allow the later 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 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 - yeing (through colouring) and fatliquoring - drying - finish - softening - final check |
| Tanning methods |
|---|
| Chrome tanning - Vegetable-tanned leather - Synthetic tanning - Tanning with fats and oils |
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