Chrome Free Leather Processing Trials
- Experimentation Plan
- Details of the Processing Procedures of the Experimentations
- Application of Chemicals for Eco-Leather Production
- Testing Results of the Effluents Collected at Various Stages of the Experimentation Process
- Testing Results of Leathers Produced from Experimentation
- Shrinking test Result of Leathers Produced from Experimentation
Leather and leather products sometimes contain some hazardous substances like Cr6+. In order to eliminate or reduce the hazard of harmful chromium compounds in product and the waste after tanning, chrome free tanning technology such as vegetable tanning has been applied to different types of leather. Though chrome free type leather does not have characteristics comparable to chrome tanned leather such as resistance to high temperature, chrome free leather begins to be accepted by importers in developed countries. For instance, some infant shoes importers are demanding chrome-free leathers.
A series of trials for the development of chrome free processes including wet white pre-tanning and tanning, vegetable tanning, chrome free re-tanning were conducted by the project team. The experimentations started from beam house process, tanning, re-tanning and dyeing, and finishing. The raw materials selected for the experimentations include cow hide, goat skin and deer skin. During the trials, effluents from various stages of processing were collected for analysis of pollution load. While the leathers produced were evaluated in terms of strength and content of restricted substances.
Experimentation Plan
Three types of common raw materials, cow hide, goat skin and deer skin, are selected for the chrome free processing trials. The processing stages include beam house, pre-tanning, tanning, re-tanning and dyeing and finishing. Different processes after beam house have been conducted according to the end use of the leather produced.
Input and Output for Trail
* The cow split suede is obtained from the raw cow hide after beam house process.
Details of the Processing Procedures of the Experimentations
(For more charts on bovine hide, please refer to the menu.)
(For more charts on bovine hide, please refer to the menu.)
(For more charts on bovine hide, please refer to the menu.)
Application of Chemicals for Eco-Leather Production
Principle of Input Selection
- Banned products: never applied
- Materials with heavy pollution: to avoid or to reduce their use levels.
- To select alternatives with similar effects, taking costs and functions of the finished products into account.
- Natural or degradeable materials.
- Quality requirements of the finished products should not be affected after the application of the chemicals……
Testing Results of the Effluents Collected at Various Stages of the Experimentation Process
Testing Results of the Effluents Collected at Various Stages of the Experimentation Process
Testing Results of Leathers Produced from Experimentation
Testing Results of Leathers Produced from Experimentation
Shrinking Test Result of Leathers Produced from Experimentation
Shrinkage Test Result of Leathers Produced from Experimentation
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Gloves Made by Leather Specimen from Experiment
(Chrome Free Deer Skin) |
Shoes Made by Leather Specimen from Experiment
(Chrome Free Bovine Suede Splits) |
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