Difference between revisions of "Leather defects"
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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 colour fixation, for example by excessively concentrated dyes or | + | * '''[[Dye transfer from leather]]''' is a result of insufficient colour fixation, for example it can be caused by excessively concentrated dyes or not enough washing after the dyeing stage. If the colour concentration is too high, '''[[Bronzing leather|bronzing]]''' can also occur. |
| − | * In the [[Liming - Leather Tanning|liming process]], | + | * In the [[Liming - Leather Tanning|liming process]], excessive contact with fresh air air can cause '''liming stains''' on the [[Leather grain - Grain side|grain side]] of the leather. |
| − | * | + | * Irregular '''blood stains''' are caused by lack of drainage of the salt liquor after the [[Preservation by drying, salting or freezing|preservation of the hides by salting]]. |
* '''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 | + | * '''[[Fatty spew - 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]. | ||
Revision as of 20:46, 28 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 it can be caused by excessively concentrated dyes or not enough washing after the dyeing stage. If the colour concentration is too high, bronzing can also occur.
- In the liming process, excessive contact with fresh air air can cause liming stains on the grain side of the leather.
- Irregular 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 spew - 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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