Lignocellulosic Biomass Processing - Food and Industrial Bioproducts and Bioprocessing - page 301

Bale opening

Stalk breaking

Fiber breaking
and separating

Fiber opening and
cleaning

Figure 12.6 Bast fiber decorticating line. (Courtesy of TEMAFA.)

The fiber opening unit is designed for shortening and refining the bast fiber to meet
different end-use requirements. The fiber bundles are fed onto a rotating cylinder for
opening and cleaning through a feeding table or a volumetric feeding chute. The cylinder
surface can be covered either by pins or by saw-tooth wires, depending on length and
fineness of the short staple fiber to be produced. Following this fiber opening procedure is
a step cleaner for further removing loose shives and short fiber encapsulated in the fiber
bundles. This cleaning unit is constructed with a set of beater rollers and filter grids. After
this cleaning process, staple fiber is produced and can be transported to a bale press for
packing. Shive content of the output fiber is within 5%. Length of the produced short staple
fiber is about 50-120 mm. Fiber fineness is between 4 and 10 dtex. A typical decorticating
line can have a stalk feeding speed of 3000 kg/h. Extracted fiber yield is in the range of 500
to 700 kg/h (Temafa GmbH, 2003).

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