Difference between revisions of "Crust leather"
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==Crust leather== | ==Crust leather== | ||
| − | + | Crust leather is the term applied to [[leather]], which is [[Preservation by drying, salting or freezing|dried]] after [[tanning]] but has not yet been [[leather colour|dyed]]. In the case of chrome-tanned leather, this is known as "chrome crust" and, for vegetable-tanned leather, as "vegetable crust". In some definitions of crust, the leather is described as having been [[Leather dye - Leather color - Leather colour#leather dye|dyed through]] but not [[Leather dye - Leather color - Leather colour#Finish - Surface binder-based pigmentation|finished]]. | |
| − | + | Crust leather is rarely processed as it is. Usually, the leather is [[Leather dye - Leather color - Leather colour#leather dye|dyed]] and [[Leather dye - Leather color - Leather colour#Finish - Surface binder-based pigmentation|finished]] before processing. | |
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| − | '' | + | ''[[Vegetable-tanned leather|Vegetable crust]] - [[Chrome tanned|Chrome crust]]''<br></p> |
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| + | ''[[Vegetable-tanned leather|Vegetable tanned]] crust leather processed.''<br></p> | ||
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| − | ''Unusual. | + | ''Unusual: Chrome crust processed. The colouration with chromium only is unattractive and therefore a cheap solution.''<br></p> |
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==Crusting== | ==Crusting== | ||
| − | Crusting is part of the [[Leather production| | + | Crusting is part of the [[Leather production|steps for leather production]]. The main stages in the [[Leather production|leather production process]] are called, preparatory stages, [[tanning]], crusting and [[finish|surface coating]]. |
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| − | + | Crusting is when the hide is [[Leather production#Shaving|thinned]], [[tanning leather#retanned|retanned]] and [[Oils & fats in the leather industry#Fatliquoring (regreasing)|regreased]]. Often a [[Leather dye - Leather color - Leather colour#Dyed leather|dye process]] is included in the crusting. Also, part of the crusting process involves [[Drying leather|drying]] and [[softening]]. | |
| − | < | + | <u>Crusting may include the following working steps depending on the [[types of leather|type of leather]]:</u> |
| + | * '''[[Split leather|Splitting]]''': The leather is split into one or more horizontal layers. | ||
| + | * '''[[Neutralising|neutralisation]]''': The pH of the leather is adjusted. | ||
| + | * '''[[tanning leather#retanned|Retanning]]''': Additional tanning imparts properties. | ||
| + | * '''[[Leather dye - Leather color - Leather colour#Dyed leather|Dying]]''': The leather is coloured in the drum. | ||
| + | * '''Fixation''': Unbound chemicals are chemically bonded or removed from the fibres. | ||
| + | * '''Whitening''': The colour of the leather is lightened. | ||
| + | * '''[[Oils & fats in the leather industry#Fatliquoring (regreasing)|Fatliquoring]] and [[Oils & fats in the leather industry#Fatliquoring (regreasing)|Stuffing]]''': Fats, oils and waxes are added between the fibres to soften the leather. | ||
| + | * '''[[Shaving]]''': The leather is thinned using a machine which cuts leather fibres from the [[flesh side]]. | ||
| + | * '''Wetting''' and '''Conditioning''': Leather has to be rehydrated depending on the following working steps. | ||
| + | * '''[[Drying leather|Sammying]]''': Water is squeezed out the leather. | ||
| + | * '''[[Drying leather|Drying]]''': The leather is dried to different moisture levels. | ||
| + | * '''Filling''': Dense chemicals are added to make the leather harder and heavier. | ||
| + | * '''Stripping''': Superficially fixed tannins are removed. | ||
| + | * '''[[Leather production#Softening|Softening]]''': Physical softening of the leather by [[Leather production#Softening|tumbling and stacking]]. | ||
| + | * '''[[Sanding leather|Buffing]]''': Abrasion of the surfaces of the leather to reduce nap or grain defects. | ||
Latest revision as of 16:30, 13 December 2022
Crust leather
Crust leather is the term applied to leather, which is dried after tanning but has not yet been dyed. In the case of chrome-tanned leather, this is known as "chrome crust" and, for vegetable-tanned leather, as "vegetable crust". In some definitions of crust, the leather is described as having been dyed through but not finished.
Crust leather is rarely processed as it is. Usually, the leather is dyed and finished before processing.
Vegetable crust - Chrome crust
Vegetable tanned crust leather processed.
Unusual: Chrome crust processed. The colouration with chromium only is unattractive and therefore a cheap solution.
Crusting
Crusting is part of the steps for leather production. The main stages in the leather production process are called, preparatory stages, tanning, crusting and surface coating.
Crusting is when the hide is thinned, retanned and regreased. Often a dye process is included in the crusting. Also, part of the crusting process involves drying and softening.
Crusting may include the following working steps depending on the type of leather:
- Splitting: The leather is split into one or more horizontal layers.
- neutralisation: The pH of the leather is adjusted.
- Retanning: Additional tanning imparts properties.
- Dying: The leather is coloured in the drum.
- Fixation: Unbound chemicals are chemically bonded or removed from the fibres.
- Whitening: The colour of the leather is lightened.
- Fatliquoring and Stuffing: Fats, oils and waxes are added between the fibres to soften the leather.
- Shaving: The leather is thinned using a machine which cuts leather fibres from the flesh side.
- Wetting and Conditioning: Leather has to be rehydrated depending on the following working steps.
- Sammying: Water is squeezed out the leather.
- Drying: The leather is dried to different moisture levels.
- Filling: Dense chemicals are added to make the leather harder and heavier.
- Stripping: Superficially fixed tannins are removed.
- Softening: Physical softening of the leather by tumbling and stacking.
- Buffing: Abrasion of the surfaces of the leather to reduce nap or grain defects.
Additional information
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