These views of a Kelly Duplex Model 4808
mixing ribbon assembly illustrate the heavy-duty stainless steel triple
ribbon construction designed for rapid mixing of batched compounds. The
assembly is 8 feet long and 4 feet in diameter with a center discharge
pattern. It is constructed from 6-5/8" heavy wall tubing, 1-3/4"
diameter arms and a 4" diameter T2205 high strength alloy stainless
steel drive shaft. The double helix outer ribbon is fabricated from
5/8" thick T304 stainless steel plate. The single inner ribbon is of
1/2" stainless construction. The high strength stainless arms are
installed to pass through the core tubing for added strength and life, and
are massively reinforced at the ends. All welding is continuous and ground
smooth, and all surfaces are finished and blasted. Nominal batching
capacity of the Model 4808 Ribbon Mixer is 60 to 90 cubic feet of various
Full and oblique views illustrate construction detail of
triple-ribbon heavy-duty design.
Detail views illustrate ribbon reinforcing at critical
load points and intricate ribbon mixing pattern.
The inner ribbon is designed to move material from the
center of the batch to the outer ends of the mixing vessel. The double
outer ribbon, in turn, moves material from the ends of the mixer to the
center and provides for discharge and cleanout.
Outer ribbon end detail illustrates reinforced close
clearance of outer ribbon to mixing vessel endplate.
Inner ribbon detail shows the reinforced inner ribbon
overlapping the center of the mixing vessel to pick up material and carry
it to the outside ends.