LUNDBERG FOAM CONTROL SYSTEM

Many years of operation have proven the capabilities of the Lundberg Foam Control
System. At the heart of the Lundberg System are the Foam Breaker and Soap
Concentrator, two mechanical Foam Breakers that can handle any kraft black liquor foam
problem from any wood species.

The Lundberg Foam Breaker is specially designed for operating on black liquor foam.
This unit is capable of collapsing light foam to a relatively high density for further soap
concentration while discharging the separated air to atmosphere.

The Lundberg Foam Control System was originally developed to contain the large
volumes of foam generated during oxidation of high resin content weak black liquor. The
Lundberg answer to this foam control problem was a system in which air and stable foam
were mechanically separated. Stable foam, which will not readily go back into solution,
results from the presence of foam causing agents (mainly soap). After some drainage,
the remaining foam is rich in those materials which are very difficult to redissolve in the
associated liquor.

Our design takes full advantage of this natural phenomenon and further concentrates and
removes this material from the process stream. The resulting product contains
approximately 4 to 6 pounds per gallon of soap collected. This approach led to the only
successful oxidation systems on weak Ponderosa Pine and Southern Pine liquors.

The Lundberg Foam Control Equipment is now operating in many pulp mills to control
foam from other problem areas including: Foam collection tanks, washer filtrate Systems
and soap skimming tanks. The Lundberg System can be used to separate soap from the
black liquor right at the source of the problem--economically. Each installation is always
custom designed for the particular mill conditions.

The Lundberg System offers you these advantages:

1.    Versatility to work on all foam control problems with the same basic equipment.

2.    Positive foam breaking with minimum back pressure on existing equipment.

3.    Separation and removal of the soap from the process stream.

Proper application of the Lundberg System can result in improved performance of all
associated equipment affected by soap and foam.

Consider the conventional Foam Breaker which discharges back to the washer filtrate
system. It recycles foam, fibers and sludge forming materials back into the filtrate tank
where they can build up to create high foam and fiber problems. This type of operation
has been accepted throughout the industry for many years due to a lack of equipment
which would remove this build-up.

A.H. Lundberg's solution to the problem is a rather simple and straightforward one:
separate and remove all available soap, foam and fiber.

After years of development and a number of modifications to the internals of the Foam
Breaker, a successful machine was developed for soap removal. The Soap Concentrator
was being developed at the same time. The Foam Breaker proved to be a viable
machine complemented by the Soap Concentrator to form a workable system for
separating and removing virtually all of the foam and soap being delivered to them. This
system is presently working in mills throughout the world.

Some of the benefits of this system include:

•    Reduction of defoamer usage.

•    Reduced cut-back on washers, due to high foam causing back pressure in the
filtrate system (this can run as high as 10 tons per day of production in a 100
ton per day mill).

•    Reduction of evaporator boil-out time due to reduced soap, fiber and sludge
flow to evaporators. Fiber and sludge are carried along with the soap to the
soap handling system.

No other foam control equipment is available that can equal the performance of the
Lundberg System.

We will be pleased to provide you with more information for your particular mill requirements.