UTILIZATION OF WASTE SEED FROM THE TOMATO. 



if 



Table V. — Expeller tests of various lots of tomato seed dried in rotary and 



tray driers. 



Kind of seed. 



Weight of product (pounds). 



Net results (per 

 cent). 



Seed 

 pressed. 



Oil ob- 

 tained. 



Foots. 



Oil. 



Oil and 

 foots. 



Rotary drier: 



67.5 

 £0 



73.25 

 20 



63.75 

 81.25 



10.25 



8 

 10.25 



2.75 



12.0 

 15 



Trace. 



1.75 



Trace. 



Trace. 



Little. 

 1.75 



15.1 



16 



14 



15. 1 





19.5 





14 





13.7 



Tray drier: 





18.8 





18.4 



20.6 







The yield of oil ob- 

 tained from the several 

 lots of seed varies con- 

 siderably, but it is noted 

 that neither fermenta- 

 tion nor heating of the 

 seed previous to drying 

 had any material effect 

 in decreasing the yield 

 of oil. Neither can it 

 be concluded from the 

 results obtained that the 

 seed dried in the tray 

 drier produced a higher yield of oil than that dried in the rotary 

 drier. The apparently higher yields are explained by the fact that 

 before the tray-dried seed was run through, the expeller had been 

 operated for several hours, thus causing a higher temperature, due 

 to the heating of the barrel. Furthermore, the adjustments neces- 

 sary for the efficient operation of the expeller with this particular 

 material had been perfected when the tray-dried seeds were passed 

 through. A yield of about 17 per cent of oil can therefore be ex- 

 pected from tomato seed by means of a perfectly adjusted expeller 

 operating at its greatest efficiency. 



Fig. 10. — A commercial oil expeller. 



