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: info@britas.de

Internet: http://www.britas.de