2017 International Forest Industries Magazines May 2017 SHOW Special | Page 59

In a challenging waste wood
market climate, the targeted
and effective processing of used
wood is more important than ever,
according to leading equipment
supplier Komptech. For the past
few years Komptech has devoted
its efforts to developing machines
for this purpose, and so can offer
economically efficient solutions.
There’s no getting around it
for over a year the German waste
wood market has been suffering
from a drastic oversupply of
material, more than processors
can quite cope with. Mild winters,
longer power station down times,
and greatly increased quantities
of material from collection and
construction waste are some of the
factors that have brought about
this situation.
For these reasons, effective,
targeted processing is more
important than ever in order to deal
with the volumes while achieving
the necessary product quality
at acceptable cost, for recycling
or fuel use. For some time now
Komptech has devoted its attention
and resources to the development
of waste wood processing
machinery.
Whether for recycling or fuel
use, quality comes first, according
to the supplier.
“There are some things that
need to be considered when
processing used wood, because
the material can vary widely.
This starts with the amount of
hazardous material contamination,
which is classified in waste wood
categories AI to AIV and the special
PCB category,” Komptech said.
“The origin of the wood is
just as important for the various
processing steps. Whether
from bulk waste, packaging or
demolition, the wood is typically
delivered unsorted and more or
less heavily contaminated with
foreign objects and contraries.
These include metallic contraries,
as well as plastic and many other
materials.
“Material reclamation, i.e.
recycling, takes pride of place
over thermal reclamation, i.e.
use as fuel. Particle board
manufacture is a typical application
where reclaimed waste wood is
increasingly replacing new wood.
“But regardless of the intended
use, the quality of the reclaimed
material is always the first priority.
It must have minimal contaminants
and fines, and be as homogeneous
as possible with a defined
composition.”
The new Multistar One makes treatment of waste wood and biomass even
more efficient. It sends overlengths back to the shredder while screening
out the useful fraction
Low-speed advantages
Komptech has examined
different processing methods
very thoroughly with regard to
product yield and operating costs.
Testing of high and low-speed
shredders measured throughput,
energy consumption and granular
size composition, the latter by
screening.
To evaluate operating costs,
tests compared single-stage
processing with high and low-
speed shredders, and two-stage
processing with low-speed
shredder and screener to return
overlengths for reshredding.
Testing was performed on
three different system scales.
For systems running up to 15,000
t annually, single or two-stage
processing had the same operating
costs, while at up to 30,000 t or
50,000 t annual throughput the
two-stage configuration with
screener for overlength return was
the more economical solution.
Naturally, in this context the
A low-speed shredder like the Crambo not only delivers the best
performance for waste wood processing, it is also least sensitive to
contraries
insensitivity of low-speed machines
like the Crambo and Terminator
to metallic contraries is very
important, especially in contrast to
high-speed chippers like the Axtor,
which despite its free-swinging
blades is still liable to more wear or
damage over long term.
The most economical variant:
Crambo and Multistar One
Waste wood processing is most
effective with the new Multistar
One star screen downstream of a
Crambo or Terminator shredder.
The Multistar One separates out
a defined useful fraction while
returning overlengths to the
shredder.
With a feed hopper for
precise material transfer to the
generously dimensioned screen
deck, a discharge conveyor
with 4 m discharge height and
a return conveyor that can pivot
through 220°, the One provides a
throughput of up to 200 m3/h.
The current for the electric
motors can come either directly
from the grid or from a combination
of additional hydraulic pump
on the shredder and hydraulic
generator on the Multistar One.
With its compact crane lift frame
and variable conveyors for flexible
setup plus electric drive, this new
Komptech star screen is a very
economical machine.
SHREDDING AND
CHIPPING MADE EASY.
Axtor 6010
Universal
wood shredder
- 2 IN 1: SHREDDER AND CHIPPER
- CONTRARY-RESISTANT
- HIGH THROUGHPUT
- MAINTENANCE-FRIENDLY
www.komptech.com
International Forest Industries | APRIL / MAY 2017 53