THE MILLING OF RICE. V) 



rapidity of the feed. Four to six paddy machines are generally em- 

 ployed in a mill of GOO barrels daily capacity. The structure and ar- 

 rangement of two paddy machines are shown in figure 4. 



Table I shows the efficiency of the paddy machine in separating 

 the unhulled from the hulled rice. In studying this table, it must be 

 remembered that about 80 per cent of the rice passes out at the lower 

 or clean-rice side of the machine. 



Table I. — Average results of analyses of four samples of the Honduras type of 

 rice secured from the feed boxes of paddy machines and of corresponding 

 samples from the troughs at the clean-rice and rough-rice sides. 





Product. 



Rice (per cent) from — 





Feed box. 



Clean side. 



Rough side. 





81.85 



17.25 



.90 



98.98 

 1.02 



16.56 





77.68 



Hulls 



5.76 









The rice from the rough side of the paddy machines is returned 

 to a pair of small stones which are set close together, where the short 

 kernels are hulled and then combined with the rice from the first 

 stones. The rice from the clean side is now practically free from 

 hulls, but the grains retain the thin brown bran layer as well as the 

 eye, or germ, intact. 



Hullers. — The name " huller," given to the next machine in the 

 milling process, is very misleading, because in reality this machine is 

 used for removing the bran layer from the grain which has been 

 hulled by the stones and freed from rough rice by the paddy machine. 

 The word " huller " is universally understood in this connection in 

 the rice industry, and hereafter when the word appears in this bulle- 

 tin it will designate the machine which receives the rice from the 

 paddy machine and scours off the outer bran layers. The name was 

 probably inherited from the similar machine, the plantation huller 

 already described, which removed hulls as well as bran. The modern 

 huller is somewhat smaller but otherwise very similar to that already 

 described, and six or seven machines are necessary in a 600-barrel 

 mill. The grain from the clean-rice side of the paddy machine is 

 conducted to the feed hopper of the huller and thence passes into 

 the cavity of the machine. A part of the bran layer on the outside 

 of the grain and most of the germ are removed, largely by scouring 

 between the rough inside iron walls of the tapering cylinder and the 

 grooved surface of the rapidly revolving core. Figure 5 shows the 

 type of huller used in modern rice mills. In this machine the milling 

 quality of the rice is put to a severe test and the grain much whitened 

 10832°— Bull. 330—16 2 



