In 1994, STG-FCB began design of a milling train using two crushing rolls in an effort
to reduce manufacturing, installation and operation costs of the factory extraction unit.
The first two-roll mill was installed at ORD River Sugar Factory and while verifying the
validity of the two-roll concept, failed to meet performance criteria. After analysing data
obtained from the Ord River milling train, intermediate feeders were incorporated in a
revised design to allow the transportation of fibre at lower compactions than observed at Ord River. This refined five-stand milling train was installed at Tay Ninh Sugar Factory
in Vietnam and commissioned in late 1997. Performance of this milling train exceeded
expectations and further design improvements were undertaken. The fixed centre
variable speed rolls used at both Ord River and Tay Ninh were replaced with floating
centre fixed speed rolls for the four stand milling trains installed at Quang Nam and
Kien Giang factories in Vietnam. Further performance gains were achieved with these
design changes with Pol extraction averaging greater than 96% over a 72 hour test
period. This paper examines the evolution of the STG-FCB milling train consisting of
two crushing rolls through to the next step.