Ghee from Makhan (desi butter) is made in a small batch in Karahi. After the water is evaporated and ghee is ready, it is cooled and residue is separated. With the help of a stirrer called Khunti, scraping is done for better heat transfer. This method is not hygienic though common in villages.
i. Ghee Boiler
At an industrial scale of manufacturing Ghee, Kettle. It is a double walled, hemi-spherical or cylindrical shape jacketed vessel. It has provision for steam heating at a steam pressure of 3.5 kg/cm 2 and condensate outlet, safety valve pressure gauge, agitator cum scraper etc. Since there will be deposit formation on heating surface regular scraping at slow speed is required.
There is also a product outlet valve for unloading the finished product. The capacity of this kettle ranges from 50 kg to 1000 kg. There is also one dial type thermometer to indicate the temperature of the jacket. The temperature is varied during preparation of ghee. Same vat or a separate vat may be required for settling the residue and cooling the ghee. For this, agitator is stopped and the product is held overnight and the residue, which settles in, the bottom is filtered out. Ghee is then packed in the polyethylene or plastic pouches or tin-coated cans. Filling and sealing is done manually. For large production, this operation is also mechanized. Suitable filters and cappers are available.
Continuous ghee-making machine has been developed at National Dairy Research Institute, (NDRI), Karnal based on the principle of scraped surface heat exchanger to manufacture ghee from butter. It has capacity of 500 kg/hour and above.
i. Ghee Boiler
At an industrial scale of manufacturing Ghee, Kettle. It is a double walled, hemi-spherical or cylindrical shape jacketed vessel. It has provision for steam heating at a steam pressure of 3.5 kg/cm 2 and condensate outlet, safety valve pressure gauge, agitator cum scraper etc. Since there will be deposit formation on heating surface regular scraping at slow speed is required.
There is also a product outlet valve for unloading the finished product. The capacity of this kettle ranges from 50 kg to 1000 kg. There is also one dial type thermometer to indicate the temperature of the jacket. The temperature is varied during preparation of ghee. Same vat or a separate vat may be required for settling the residue and cooling the ghee. For this, agitator is stopped and the product is held overnight and the residue, which settles in, the bottom is filtered out. Ghee is then packed in the polyethylene or plastic pouches or tin-coated cans. Filling and sealing is done manually. For large production, this operation is also mechanized. Suitable filters and cappers are available.
Continuous ghee-making machine has been developed at National Dairy Research Institute, (NDRI), Karnal based on the principle of scraped surface heat exchanger to manufacture ghee from butter. It has capacity of 500 kg/hour and above.
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