3.1.3  Batch preparation operation

Batching is considered to be one of the most critical and essential operations in feed manufacturing. Lack of proper batching can lead to reduced diet uniformity,  affecting not only animal performance but regulatory compliance as well.

Fig. 3.3 Computerized batching

The  batch  section  of  the  plant  consists  of  mainly  pre-weighing  bins,  bin  dischargers, weigher, hopper below weigher, chain conveyor and elevator. Formulae containing various available ingredients stored in the RMG/ Silos based on least cost to produce a specific type balance concentrate feed are made available by the Nutrition Officer for production. All  such  ingredients  are  stored  in  various  pre  weighing  bins.  Plant  is  provided  with automatic  microprocessor  controlled  batching  system  for  accurate  batching  (Fig.  3.3). As  per  feed  formula,  desired  quantity  of  each ingredient  is  discharged from  the  pre- weighing bins (Fig. 3.4) into the batch weigher (through VFD operated bin discharger for more accurate batching) to make a complete batch of 1.0/ 1.5/ 2.0/ 2.5 MT (as per plant capacity) including  molasses. Batching operation  is  done  from  the  control  room.  Once the  batch  is  ready,  it  is transferred from the batch weigher  to  the  hopper below  batch weigher through a pneumatic flap and  the  batch  weigher starts  getting  the  next batch.   The   complete batch is then mechanically conveyed to hopper above hammer mill in grinding section through batch chain conveyor and elevator. The quality control officer must    periodically    check the   accuracy   reports   of the    computerized    batch preparation system to ensure that weighing of individual raw material is in accordance with the feed formula and that large deviation of set and achieved weights are not taking place. Periodically, he should also check the accuracy of the weigh scale and calibrate the same if necessary

Fig. 3.4 Pre-weighing bins