Sweetie barrel

Fig. 244. A dragfe apparatus ( sweetie barrel ) for polishing fine-grained nitrocellulose powder [7].

Then each batch is rotated in a conventional sweetie barrel until a uniform black glaze and the desired moist content are obtained(which takes ca 2hrs)... 

Figure 71. Sweetie Barrel. (Courtesy Western Cartridge Company.) The moist and mixed ingredients of bulk powder, tumbled in this apparatus, take on the form of grains. Similar equipment is used for sugar-coating pills and for applying a deterrent coating or a graphite glaze to grains of colloided smokeless powder.

Still another mixing device can be used in explosives industry- It is the tumbling mixer which, accdg to Perry (Ref 7, pi212), exists in three varieties a) " tumbling barrel or ball mill (Ref 7, Fig 32) b) "double-cone mixer (Fig 33) and c) mushroom mixer (Fig 34), which is reproduced here as Fig 3- This mixer is called sweetie barrel by Davis (Ref 5, p290 and is shown as Fig 71 on p291)... 

---