Raw material: Take wet salted cow hide (good selection).
Trimming: By hand knife. Take salted weight (All % based on this salted weight)
Now see the chart of the operations step by step of the tanning with chemical used, time required and analytical test.
Tannery |
Operation | % of chemical use | Time | Analytical test |
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Pre-soaking | 300% water 0.2% soda ash 0.2% LD 600 | Run 60 minutes Drain | |
Main soaking | 300% water 0.4% soda ash 0.3% LD 600 0.2% preservative | Run 30 minutes Leave overnight, next day drain wash well | |
Liming | 300% water 4% lime 3.5% sodium sulphite 1% liming auxiliary 0.2% LD 600 | Run 30 minutes Leave the bath for 2-3 days Then scudding by hand | |
Chemical wash | 200% water 0.25% meta bi-sulphate | Run 20 minutes Drain | |
Deliming | 100% water 1.5% ammonium chloride 1.5% ammonium sulphate 0.5% meta bi-sulphate | Run 45 minutes | Check with phenolphthalein |
Bating | 100% water 1% batting agent 0.5% wetting agent | Scudding, wash well Run 60 minutes Drain | Check: Thumb and Bubble test |
Pickling | 80% water 8% salt 0.2% impropel CO 0.5% formic acid 1.2% sulphuric acid 0.5% hypo | Leave ovewnight Run 15 minutes Run 30 minutes Run 2 hours Run 30 minutes Drain half pickle bath | Check pH |
Chrome tanning | 4% Basic chromium powder+ 4% basic chromium powder 1% sodium formate 0.5% OCS 50% water | Run 30 minutes Run 60 minutes | Check: Penetration 100% |
Basification | 1.2% sodium bi-carbonate 0.2% preservative | Run 90 minutes Run 60 minutes | Check final temperature 28 - 40 degree celcius pH = 3.7 - 3.8 |
After completing the above operations, assess the wet blue.
Assessment:
1. Boil test
2. Shrinkage temperature
3. Chromic oxide estimation
4. Grading and selection
5. pH check
Assessment:
1. Boil test
2. Shrinkage temperature
3. Chromic oxide estimation
4. Grading and selection
5. pH check
Goat hides: The process of manufacturing technology if standard wet blue from salted goat hides is same as Cow hides except that there is an additional operation in goat hide called Painting.
Paiting chemicals that required are as follows -
Painting | 8% lime 2% sodium sulphite 0.2% LD600 | water requires to make as paste. 4-6 hours or overnight |
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