480 



MARINE PRODUCTS OF COMMERCE 



eliminating odors is by scrubbing. The gases from the drier are passed into a 

 tower containing a number of water sprays. The fine spray absorbs objectionable 

 odors and carries them into the sewer. 



(.Courtesy P and L Welding and Machine Works) 



Fig. 22—8. A cut-away showing the internal construction of the air-lift 



drier. 



Packaging the Fish Meal. When the dried meal is discharged from the drier, 

 its temperature varies between 200 to 400° F (93 to 204° C). It contains from 

 6 to 10 per cent moisture and from 3 to 6 per cent oil, depending upon the effi- 

 ciency of the plant. Many plant operators spread the meal over the floor to cool 

 before weighing it into 100-pound bags. Sacking the hot meal frequently causes 

 excessive heating due to continued oxidation of the oil contained in the meal. 

 The greater the oil percentage the greater the heating of the sacked meal. Heating 

 results in an inferior grade of meal, which consequently brings a lower price. Har- 

 rison (1939) found that placing the hot meal in double-wall paper bags, with 



