UTILIZATION OF SHKIMP WASTE 



113 



turo content causes difliculty in <>rinclin<i:. If platform clryin*:^ of 

 shrimp Avaste in wide trays is used the trays can later be transferred 

 to the drying oven or tunnel. If reduction down to 20 per cent 

 only is desired and the stock is small, flat wooden boxes or trays 

 can be used and the turning of the stock accomplished by inverting 

 one tray over another. 



The type of drier that should prove most satisfactor}^ to the shrimp 

 handler is the shelf drier. (See fig. 2.) This can be constructed of 

 sheet iron to reduce the fire hazard and made with riveted cleats 

 upon Avhich to slide the drying trays. By making the drier long 

 enough to permit the staggering of the trays, a long tortuous path 

 for the heat is provided in 

 passing over the stock and 

 greater efficiency of drying 

 is accomplished than when 

 the trays are arranged 

 otherwise. The heating can 

 be accomplished by using 

 oil stoves, which permit 

 easy control of the flame. 

 The cost of drying stock 

 with kerosene is one-third 

 of a cent per pound of the 

 dry stock. Drying to crisp- 

 ness brings the moisture 

 content down to about 6 per 

 cent. The dried material is 

 now ready for grinding. 



Grinding. — The nature of 

 the dried waste requires a 

 disintegrator type of 

 grinder for the most effi- 

 cient reduction, although 

 other types of grinders will 

 give satisfactory service. 

 The feed or grain mill with 

 adjustable rotating disks 

 can be utilized to great ad- 

 vantage by making the 

 grinding operation in three 

 stages, viz : Coarse, medium, 

 and fine adjustment. After 

 the material is run through the grinder with the disks at coarse ad- 

 justrnent. the material is returned to the grinder, reduced with the 

 adjustment at medium grade, and finally reground to fine meal. A 

 series of three grinders set at the three grades, the second and third 

 grinders fed by the first and second, respectively, will eliminate 

 handling between stages of grinding. If the latter system is used, 

 the size of the grinders should be varied so that each succeeding 

 grinder adequately handles the meal delivered to it from the pre- 

 ceding grinder. Grinding the stock just after delivery from the 

 driers facilitates the pulverizing operation. This product when dried 

 below 7 per cent moisture is easy to grind into a very fine meal. 



FiGUHE -. — End view of wooden shelf drier usin^ 

 staggered trays and oil stove 



