18 



BULLETIN B67, V. S. DEPAKTMEUT OF AGRICULTURE. 



These cage or curb presses are made in various sizes, with capaci- 

 ties varying from 100 pounds of beans per hour to about 1 ton. The 

 curbs correspondingly vary in diameter from 10 to 19 inches and in 

 height from 2| to 9 feet. An actual installation of such equipment 

 consists of a heating kettle provided with a steam jacket and stirrer 

 immediately over the press, so that the heated contents of the kettle 

 can be discharged through an opening in the bottom directly into 

 the cage. These beans are heated to about 90° F. and pressed to 

 the desired degree. The resulting cakes contain only about 10 per 



Fig. 9. — A cage finishing press for the heavy pressure 

 necessary for the production of oil. 



Fig. 10.— A cage filling, finishing, and 

 discharging press, where all operation; 

 are performed in the same press. 



cent of oil. Four such presses operated by two men have capacities 

 of 500 pounds at each pressing, or an hourly total of 2 tons for the 

 four presses with two pressings; 3 tons with three pressings per hour. 



EXPELLING. 



The other method used in modern oilseed milling which has been 

 applied to castor-bean pressing is that of expelling the oil in Anderson 

 oil expellers. These machines are built around a horizontal cage or 

 barrel, about 6 inches inside diameter and 33 inches long, which 

 consists of bars about 0.025 inch apart at the feed end, 0.015 inch 



