Difference between revisions of "Leather defects"
From www.leather-dictionary.com - The Leather Dictionary
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Leather defects are defects in the finished [[leather]], which are caused by damaged [[Natural markings on leather|raw skin]], or have arisen due to wrong [[Storage of leather|storage]] or are caused by improper processing during the [[Leather production|manufacturing process]]. | Leather defects are defects in the finished [[leather]], which are caused by damaged [[Natural markings on leather|raw skin]], or have arisen due to wrong [[Storage of leather|storage]] or are caused by improper processing during the [[Leather production|manufacturing process]]. | ||
| − | * '''[[Dye transfer from leather]]''' is a result of insufficient | + | * '''[[Dye transfer from leather]]''' is a result of insufficient colour fixation, for example by excessively concentrated dyes or too little washing out after dyeing. If the colour concentration is too high, '''[[Bronzing leather|bronzing]]''' can occur. |
* In the [[Liming - Leather Tanning|liming process]], too long remaining in fresh air can cause '''liming stains''' on the [[Leather grain - Grain side|grain side]] of the leather. | * In the [[Liming - Leather Tanning|liming process]], too long remaining in fresh air can cause '''liming stains''' on the [[Leather grain - Grain side|grain side]] of the leather. | ||
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* '''Colour defects''' can occur if the applied [[leather colour|colouration]] does not cover uniformly, especially on already damaged areas. | * '''Colour defects''' can occur if the applied [[leather colour|colouration]] does not cover uniformly, especially on already damaged areas. | ||
| − | * '''[[Fatty spue - Fat marks on leather]]''' occurs with leathers containing a high level of fat such | + | * '''[[Fatty spue - Fat marks on leather]]''' occurs with leathers containing a high level of fat such as [[sheep leather]]. |
* '''Tannin stains''' is caused by uneven concentration of the [[Tannins|tanning agent]] in the [[leather production]. | * '''Tannin stains''' is caused by uneven concentration of the [[Tannins|tanning agent]] in the [[leather production]. | ||
| − | * [[Looseness]] is caused by missing leather | + | * [[Looseness]] is caused by missing leather fibre substance under the grain surface. The surface then tends to form small wrinkles. This is a skin defect of the living animal. Such skins should not even find their way into the [[leather production]]. |
Revision as of 20:46, 21 January 2017
Leather defects are defects in the finished leather, which are caused by damaged raw skin, or have arisen due to wrong storage or are caused by improper processing during the manufacturing process.
- Dye transfer from leather is a result of insufficient colour fixation, for example by excessively concentrated dyes or too little washing out after dyeing. If the colour concentration is too high, bronzing can occur.
- In the liming process, too long remaining in fresh air can cause liming stains on the grain side of the leather.
- Irregularly blood stains are caused by lack of drainage of the salt liquor after the preservation of the hides by salting.
- Colour defects can occur if the applied colouration does not cover uniformly, especially on already damaged areas.
- Fatty spue - Fat marks on leather occurs with leathers containing a high level of fat such as sheep leather.
- Tannin stains is caused by uneven concentration of the tanning agent in the [[leather production].
- Looseness is caused by missing leather fibre substance under the grain surface. The surface then tends to form small wrinkles. This is a skin defect of the living animal. Such skins should not even find their way into the leather production.
Bronzing leather and dye transfer from leather.
Additional information
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