Process of mini dal mill

Process of de-husking is doing in two major steps. In the first step the cleaned and size graded grain are scarify followed by oil addition and sun/mechanical drying. In the second step, the removal of husk and splitting into two cotyledons is doing by passing the material through versatile pulse de-husker. This de-husker gives 2-4% higher yield of good quality Dal, than the traditional Dal mill. This method developed by Jas Enterprises is less laborious, requires less time and reduces losses during de-husking. One of these methods developed and ready for commercialization is 'MINI DAL MILL'. The technical up gradation & cost economics of the 'MINI DAL MILL combined with facilities of Grader cum Cleaner can prove to be a boon to the farmers. This unit installed near the farm itself. Process on Dal mill Cleaning and grading: This unit consists of a vibratory inclined sieve, hopper, grain collector, waste collector and motor. The vibratory sieves are providing with different size holes to match the requirements of the type of Dal being process. The vibrations are inducing by a cam-operated link, which is mounts on a motor driven shaft.

Pitting Process For Mini Dal Mill : -

An emery roller machine is use to obtain cracking and scratching of clean pulses ( Dal ) passing through it. For loosening, the husk to facilitate the subsequent oil penetration this is required. Gradually the clearance between the emery roller and cage (housing) is narrow from inlet to outlet. Cracking and scratching of husk takes place mainly by friction between pulses ( Dal ) and emery as the material is passing through the narrowing clearance. During the operation, some of the pulses ( Dal ) are de-husk and split which are separate by sieving.

Pretreatment with Oil & Water :-

A screw conveyor allows passing the scratched or pitted material through it and mixing of some edible oil like linseed oil is complete. The linseed oil is use at the rate of 1.5 to 2.5 kg/tones of pulses ( Dal ). These are keeping on floors for about 12 hours to diffuse the oil.

Conditioning : -

Pulses ( Dal ) are condition by alternate wetting and drying. Moisture (3.5%) is adding to the pulses ( Dal ) after sun drying for a certain period and tempering is doing for about eight hours. The grain is dry in the sun again. By allowing water to drop from an overhead tank on the pulses ( Dal ), which are passing through the screw conveyor addition of moisture to the pulses ( Dal ), are achieving. Until all pulses ( Dal ) are sufficiently conditioned the whole process of alternate wetting and drying is continued for two to four days. Pulses ( Dal ) are finally dry to about 10 to 12% moisture content.

De-Husking and splitting:

For De-husking of conditioned pulses ( Dal ) emery rollers called as Gota machine are used. In one pass or single operation, about 50% of pulses ( Dal ) are de-husked. De-husked pulses ( Dal ) are splitting into two parts. De-husked split pulses ( Dal ) are separate by sieving and the husk is aspirate off. Un-split de-husked pulses ( Dal ) and tail pulses ( Dal ) are again de-husk and milled in a similar way. Until the running pulses ( Dal ) are de-husked and split of the whole process is repeated two or three times.

Pre Milling of Pulses ( Dal ):

To obtain best results during de-husking and splitting of pulses ( Dal ) in the pulse de husking machine in Jas brand mini Dal mills, latest model improved version, pre milling including grading of pulses ( Dal ) size wise is very essential. The raw pulses ( Dal ) are first clean of dust, chaff, stones and other extraneous materials. Sieves grade cleaned pulses ( Dal ) or pulses ( Dal ) graded and soaked in water in cement�s tanks having 6" depth. Height of pulses ( Dal ) soaked be 5" and the water level should be 1" above the pulses ( Dal ). Soak pulses ( Dal ) are taken out of the water after specific time and put on the sieve. Swollen pulses ( Dal ) which do not pass through sieve (from which un-swollen pulses ( Dal ) earlier passed through the same) are ready for heaping in shade whereas the pulses ( Dal ) which pass through the same sieves. Then these pulses ( Dal ) are ready for heaping in shade. Degree of happing of swollen pulses ( Dal ) in shade should be 30 to 40. This process should be continuing until the pulses ( Dal ) are swill to the desired extent. There after the pulses ( Dal ) are in thin layers in the open sun drying. Duration of sun drying of pulses ( Dal ) vary according to weather condition prevailing at the time of processing. After sun drying, the pulses ( Dal ) are again heap in shade so moisture contents in the pulses ( Dal ) may become uniform as need in them for de-husking. Then the pulse are graded again fed in to the pulse de husking machine in Jas Mini Dal Mill in graded lots to achieve he best results with minimum brokenness. For the guidance of the entrepreneurs, the process of details of pre-milling of pulses ( Dal ) after proper cleaning is show here after in a tabulated chart.

Note: -

• Period of soaking in water will vary according to weather condition and quality of pulses ( Dal ).
• Duration of sun drying will vary according to weather condition.
• Pulses ( Dal ) should not be warm at the time of De-husking/splitting.
• Pulses ( Dal ) should be de-husk and split in graded lots only.
• Pulses ( Dal ) shown at one & two must be dry within 3 days to get better results. Their processing in any season should be avoiding.
• The de-husked pulses ( Dal ) mixed with the un-husked pulses ( Dal ) and the husks are again de-husked in the Jas brand mini Dal mill as usual. In second pass all, the pulses ( Dal ) are de-husked.

Further process details of pulses ( Dal ) at sr.nos.5a, 5b, 6a & 6b Moong (Green Grams) & Urid (Black Grams)