Slotted-wall expander

Figures. Slotted-wall expander (Courtesy of Anderson International Corp., Cleveland, Ohio).

Field trials with canola (65) and other oilseeds (66) show that the slotted-wall expander could extrude full-fat oilseeds at high oil levels and produce collets at 20-30% oil. Such expanders are used on full-fat safflowers, sunflower, peanut, canola, and rapeseed. The oilseeds are prepared by drying, or by cooking and drying and flaking, similar to the way they are for screw-pressing. The slotted-wall... 

Figure 22. A typical slotted-wall expander in operation. Courtesy of Anderson International, Cleveland, Ohio. (This figure is available in full color at http //www.mrw.interscience.wiley.com/ biofp.)...

Hydraulic cone chokes can be mounted on closed-wall or slotted-wall extruders. Cake flowing across the cone to atmosphere expands with internal pores similar to collets from dies. The sheets of cake dropping from the cone break up in transit to the solvent extractor similar to the way collets break up. 

Fig. 4. Examples of expanded dow bins showing where funnel dow becomes mass dow (a) funnel dow cone modified with mass dow transition hopper, where BP = outlet width, DF = diameter, 0 = end-wall angle, and 0 = side-wall angle (b) long funnel dow slot modified with mass dow cones, where...

Now, as the weir wall brick grow and expand, the brick can release thermal stress by sliding outward on the Teflon film under them, and slide into the brick slots in the wall, compressing the foam. This curved design provides for both the thrust against the wall from upstream and the expansion of the brick in the weir wall. The designer should bear in mind that like other all-brick structures, this wall will not be liquid-tight and will weep into the downstream side. It will, however, act to trap any suspended material that settles out. 

---