Mixing and blending


Berntsen, S.

European Dairy Magazine 11(3): 14-16

1999


An account is given of dairy equipment used for mixing and blending, with particular reference to emulsification, dissolution of dried milk products and mixing high-viscosity products.

News
Mixing
and
blending
Mixing
and
blending,
two
industrial
processes
that
are
notably
deficient
in
scientific
understanding,
are
the
subject
of
a
three-year,
S
250,000
research
pro-
gramma
being
proposed
by
IIT
Research
Institute.
IITRI
is
approaching
firms
which
are
users
or
manufacturers
of
mixing
and
blending
equipment,
proposing
that
the
program
be
supported
on
a
group
basis.
Among
the
industries
being
contacted
are
those
concerned
with
bulk
chemicals,
food,
minerals,
paint,
pharmaceuticals
and
other
com-
modities
requiring
mixing
and
blending.
The
purpose
of
the
program
is
to
achieve
basic
scientific
understanding
of
the
mixing
and
blending
of
powders,
liquids,
pastes
and
slurries,
permitting
optimization
of
current
practices,
improvements
in
machine
design,
improvements
in
methods
of
sampling
and
analysis,
and
ability
to
predict
the
most
suitable
mixer
for
a
given
purpose.
A
mixing
and
blending
performance
index
also
will
be
pre-
pared,
upon
which
cost
analyses
may
be
based.
The
study
will
be
designed
to
reveal
the
effect
of
chosen
parameters
on
such
mixing
and
blending
mechanisms
as
diffusion,
shear,
convection
and
segregation.
Parameters
to
be
taken
into
account
include
particle
size,
shape,
distribution,
and
sur-
face;
particle
density
and
strength;
particle
charge
and
moisture
content;
liquid
viscosity
and
density,
and
solids
concentration.
Machine
operating
variables
will
be
studied
to
determine
their
effect
on
mixing
and
blending
efficiency.
The
variables
will
include
mixer
geometry,
flow
pattern,
degree
of
fill,
method
of
filling
and
emptying,
rate
of
ration,
power
requirements,
and
size
and
shape
of
impellers.
A
comprehensive
manual
of
mixing
equipment
and
specifications
will
be
compiled
during
the
program.
All
pertinent
mixing
and
blending
research
and
development
literature
will
be
surveyed
and
a
bibliography
will
be
published.
The
program
will
be
conducted
by
the
Fine
Particles
Section
of
ITIRI's
Chemistry
division.
More
information
about
the
program
may
be
ob-
tained
by
writing
Mr.
Allan
J.
Gaynor,
Manager,
Industrial
Development,
IIT
Research
Institute,
10
West
35
Street,
Chicago,
Illinois
60616.
Ponder
Technology
Elsevier
Sequoia
S.A.,
Lausanne
Printed
in
the
Netherlands