prospekt britas englisch
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Screen changerTRANSCRIPT
R e c y c l i n g - A n l a g e nG m b H
Melt FiltersFor Recycled Material
Melt FiltersMelt Filters
Plastics have become an indispensable part of everyday life.
With their almost endless variety and excellent properties,
plastics have attained a firm position amongst available materials.
In view of the constant increase in world plastics consumption
and the resulting disposal problems as well as the growing scarcity
of raw material resources, recycling is continually gaining
in significance. In order to meet rising demands with regard to the quality
of recycled material and economical production, manufacturers of plastics
processing machines are called upon to provide innovative technology.
BritAS has set itself precisely that task. The success of our company
is based on practical experience, processing know-how and extensive
expertise in mechanical engineering.
Lucian Britchi
Environmentally friendly
recycling of plastics:
Pure recycled material
of premium quality,
obtained in a continuous
production process.
A Burning Issue: Plastics RecyclingPlasticsPlastics
In this context, filtration of the plastic melt obtained at the end
of a long recycling process is especially important.
The engineering department is the heart
of BritAS GmbH. This is where the
synthesis takes place between practical
experience and technical know-how
in state-of-the-art plastics processing.
� The result is high-quality automatic screen
changers for use in recycling which have stood
the test of time.
� Highly qualified staff with new ideas and
a sense of responsibility concentrating
on further development and product care.
They give our customers the certainty
of having found a reliable partner who
provides support on a long-term basis.
� Our customers’ wishes are put into
practice rapidly and flexibly – from
construction right up to after-sales service.
� ‘The success of a company depends
on the ability to see the world through
the customer’s eyes’ – this slogan is
characteristic in all aspects of BritAS
company philosophy and is rewarded
by long-term customer satisfaction.
Mechanical engineering in the best,
most uncompromising tradition: skilled
employees produce the high-quality
individual components and assemble the
screen changer. Our production
capacity and technical service staff
provide security and after-sales service
to the highest standards.
A flexible, modern
engineering department,
smooth communication,
rapid and precise
fulfilment of customers’
wishes – these are
the hallmarks of
a reliable partner.
The switch cabinet is equipped
with branded products of
proven quality as standard.
Our Concept: All-Round CompetenceCompetenceCompetence
The valve opens and lets
the melt into the filter zone.
The accumulator piston moves
upwards at an individually
adjustable speed, thereby dosing
the amount of material taken up
during screen changing.
Screen changing is completed
once the accumulator piston
has reached its uppermost
position.
In order to ensure economic and efficient
filtering of highly contaminated plastic
melt, screen changers from the BritAS
SK range work according to a special
technical principle:
� At each filter change, fresh screen cloth is
automatically introduced into the filter zone.
� This ensures that the extruder positioned
upstream can operate continuously at full
capacity.
� In extreme cases, complete screen
changing can be performed
every 2 minutes.
A Unique Successful PrinciplePrinciplePrinciple
~18 sec.
~120 sec.
The seals close – the screen belt
is fixed and sealed once again.
The melt coming from the extruder is
continuously fed through the screen.
Fully automatic screen changing is
initiated when the maximum pressure,
which can be individually adjusted,
is reached in front of the screen.
The valve closes, depressurising
the area in front of the screen.
The plastic melt moves the
accumulator piston upwards,
thus increasing the volume
of the unit.
At the same time, the seals open,
releasing the screen belt.
The screen belt is moved along
by the driven conveyor rolls
until clean screen cloth enters
the filter zone.
and are almost impossible to remove.
The SK range provides the full filter area
available after each screen change,
thus ensuring that the unit remains highly
automatic whilst efficiently removing
even high degrees of soiling. All this is done
without the heavy material losses usually
encountered in practice, since only the plastic
adhering to the screen band is evacuated
together with the contaminants.
� The rectangular shape of the filter area
(230 x 250 mm in the SK 230) means the
screen belt is put to optimum use.
The compact screen
changer can be fitted
onto all conventional
extruders and
granulators.
A Perfect Example: Automatic Screen Changers
Type SK 230 And SK 180Screen ChangersScreen Changers
SK 230 SK 180SK 230 SK 180
The BritAS screen changer is particularly
impressive when it comes to recycling
plastics. This is where economy and
constant product quality are most essential.
� The SK range is employed for plastic
melts with average to high levels of contami-
nation, for recycling secondary plastics. The
use of fresh screen cloth for each filter cycle
combines the advantages of a conventional
filter system with those of an automatic unit.
� Owing to the type of contamination
encountered during recycling, e.g. aluminium,
paper, fibres, wood, etc., the filter medium can
only be cleaned to a limited extent. Many of
the particles ‘bite’ into the cloth or the bore
individual adjustment of the parameters.
This means smooth and fully automatic
screen changing.
� With the optionally available computer,
all relevant data can be registered and
visualised.
Our technical service can log into the unit
online, via modem, and diagnose failures
‘in a flash’.
� The highest degree of precision and the
extremely wear-resistant materials ensure
the long life and leakage-free sealing of
the system.
� Band heaters and heated plates provide
rapid and homogenous heating of the
screen changer. The individual heating
sections are adjusted to maintain the unit
at operating temperature, with low energy
consumption according to the present
state-of-the-art system.
� High-quality components are used for
both the control and the hydraulic systems.
This is an important precondition for
trouble-free operation in permanent service.
Improved quality regranulate
Increased throughput
No melt losses
No operating staffrequired
Higher yield
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� The special substructure of the screen
means that it offers approx. 70 % more
filter area than traditional systems such
as punched-plate screens.
� The complete filter area can be renewed
within seconds. This possibility, together
with the extremely low drag of the system,
guarantee a constant high throughput,
even when highly contaminated batches
are processed.
� The unit operates quite independently,
without personnel. Manpower is only
required for about 10 minutes once a day
to replace the screen magazine, containing
approx. 50 metres of screen belt. There is
no need to interrupt the production flow
during replacement.
� The screen belt consists of inexpensive
roll material (single-layer braided wire cloth)
which is available in different mesh sizes.
� The stored program control offered
as standard is the interface between the
operator of the screen changer and the
complex plastic material. This control can
be programmed as desired, enabling
The melt filter
in practical use
R e c y c l i n g - A n l a g e n G m b H
Moselstr. 50
D-63452 Hanau
Phone: +49 (0 61 81) 91 87-0
Telefax: +49 (0 61 81) 91 87-22
E-Mail: [email protected]
Internet: http://www.britas.de