EREMA Filter Systems for Thermoplastics - Extrusionauxiliary.com

EREMA Filter Systemsfor ThermoplasticsQUALITYQM-SYSTEM NACH DIN ENSYSTEMCERTFIEDISO 9001ISOTO9001www.erema.atHIGH TECH RECYCLING

The CompanyAs the worldwide leader in manufacturingof plastics recycling equipment Erema hasa wealth of experience in filtering polymermelts.Over the years polymer filtration has becomeone of Erema's key areas of expertise, dueto its quality-defining aspects.There are currently more than 2000 Eremapolymer filters being used all over the worldfor numerous different applications to thesatisfaction of Erema's customers.As your reliable partner for filtrationsolutions we offer a wide productionprogram of advanced filter systems,comprehensive advice, prompt service andworldwide support.The Technical Centre at our headquartersin Linz/Austria gives you the opportunityto conduct filtration tests under realisticproduction conditions.Different melt filter systems for almost any specific requirementCriteria such as throughput capacity range and type of application, besides individual processrequirements, are critical factors in choosing the most cost-efficient melt filter solution. Our widerange of filters and the various sizes available mean that you will nearly always find a custom Eremafilter system to meet your specific needs.Erema melt filters meet the very highest quality standards and are characterised by their heavy-dutyconstruction, high degree of automation and high-performance availability.Our products range from simple, manual lever-operated pivot disc safety filters to one-, two- orfour-piston partial area backflush screen changers as well as the high end laser filter for heavilycontaminatedpolymers.EREMA partial area backflushmelt filter SW 2/134 RTFEREMA partial area backflushmelt filter SW 4/104 RTFEREMA partial area backflushmelt filter SW 8/250 RTFEREMA Laser filterLF 2/350

The ProductsErema pivot disc safety filterManual discontinuous Erema filter for filtration of cleanpolymer melts ("safety filtration")Available sizes:CL 104: Active filter area 85cm 2CL 120: Active filter area 113cm 2Erema Partial Area Backflush ScreenChanger (RTF-Series)(Basic Layout)Erema RTF piston screen changers are different from widelyavailableconventional systems due to their completelyautomatic partial area backflushing system. Thanks to theirunique design (pressure balanced double screen design perpiston) Erema partial area backflush systems function extremelywell with a wide range of filtering requirements.The characteristics of Erema partial area backflush systemscan be summarised as follows:● Minimise influence on downstream processes thanksto lowest pressure fluctuations during backflushing andscreen changing (RTF 4 and RTF 8).● Efficient, reliable backflushing mechanism (optionallyin VC-configuration) with very short backflush channels.This dramatically increases screen service life and keepsbackflushing material losses to a minimum.● Back purging is triggered completely automatically,reducing operator requirement.Partial surface backflushing technology involves flushing acomparatively small area of the screen surface in relation tothe total active screen area by passing a central stream ofclean melt through from the back of the screen. High velocityis possible at the screen due to the small surface area ofscreen to be flushed (in particular with VC-configuration) ata time, resulting in optimum cleaning efficiency. It is alsopossible to adjust the backflushing stream, using a replaceablethrottle nozzle on the clean side of the filter (preventing riskof clogging with contamination!), adapting the system toindividual requirements. The large total screen area thatremains active even during backflushing and screen changingand the correct match of throttle nozzle enable this systemto be implemented even with sensitive downstream processes.Erema Laser filterProductionScreen cleaning(backflushing) during operationEREMA RTF-2:Semi-continuous partial area backflush filter with2 screens for lightly-contaminated polymers(basic layout)ProductionScreen cleaning(backflushing) during operationEREMA RTF-4:Fully-continuous partial area backflush filter with4 screens for medium contaminated polymers andlow pressure differences (basic layout)ProductionScreen cleaning(backflushing) during operationEREMA RTF-8:Fully-continuous partial area backflush filter with8 screens for heavily-contaminated polymers and/orultra-low pressure differences (basic layout)Constant pressure, self-cleaning, high-capacity filter forextremely heavily contaminated polymer melts (see separatebrochure).Screen discsScraperScraper discMelt inlet(basic layout)Liquid coolingImpurity dischargeImpurity dischargeDischarge screwsClean melt outletScraper movement

Applications for Erema filter systems● Discontinuous filtrationDiscontinuous melt filters which interrupt the melt stream during screen changes are mainly used for applicationswith a low level of contamination. These systems are suitable for extruders that are easy to start up after each screenchange, or where regular short interruptions to production are necessary anyway (e.g. for pellitiser knife changes)and long screen changing intervals are normal.● Continuous filtration with partial area backflushing technologyContinuous Erema filter systems with fully automatic partial area backflushing are recommended for applications withhigher levels of contamination or complicated start-up procedures. The fully-automatic cleaning mechanism greatlyreduces operator involvement and prevents downtime and time consuming start-ups. They also boost cost-effectivenessby allowing higher proportions of recycled material to be processed without compromising the quality of the finalproduct. An additional advantage is the comparatively large active area of the Erema RTF-type filters which can evenprevent peaks in contamination from interrupting the process. Due to the gentle filtration with low viscosities andconsequently low shearing of the melt at the screens, resulting from the large total active screen area of the EremaRTF-filters, also gels (depending on application), besides solid contamination, can be held back.Which filter system for which application?ensured(pressure constant)Continuousribbon filterScreen discScreen discwithbackflushLaserfilterSeparatorheads100%Pressure constant productionnot ensured(considerable pressure fluctuations)lowPivot discsingle pistonscreenchangerslide platescreenchangerdual pistonscreenchangerdual pistonscreenchanger withbackflushRTF-2...RTF-4 ...Degree of contamination of filtrated meltRTF-8 ...Discontinuousribbon filterhigh50%(Virgin)(Post consumer)The diagram shows schematically applications for different conventional filter systems being available on themarket with reference to the two main parameters process constancy (system ability to maintain pressureconstant filtration) and filtration capacity of system (capability to deal with contamination in the melt).HIGH TECH RECYCLING

Optionaltechnologies ...... for optimising thecost-effectiveness ofErema backflush screenchanger systemsErema backflush filter with "VC"(Valve Controlled) technology.The new Erema technology for adrastic reduction of melt lossesduring back-flushing.Available as an option, the latestdevelopments to proven Erema RTFsystems feature a modification thatdramatically reduces melt lossesduring backflushing. This has beenmade possible by an extremeshortening of the backflushing ways(channels and cavities) plus usingnew technologies to clean only afraction of a screen at a time, whenapplying backflushing. This results ina previously unattainable levelof screen cleaning and extraordinarysmall, economical usage of meltneeded to backflush a screen. Detailsavailable on request.These new technologies areespecially useful in the filtration ofheavily contaminated melts, allowingup to tens of thousands of euros inreduced melt losses to be savedevery year.Erema support platesThe optional 4 mm thin supportplates are extremely robust and, bysupplying a larger open screen area,enable better utilisation of the activescreen surface. Especially whenfiltering low viscosity melts (e.g. PETand PA), they reduce the filter backpressure by an average of 10% andincrease the service life of the screenset. These can easily be retrofitted toErema RTF screen changers, incombination with modified supportbreaker plates, to optimise existingfilter systems.Active total filter screen surface EremaRTF backflush screen changer-seriesScreen diameter (mm) 82 mm 104 mm 134 mm 170 mm 250 mmFilter system with .../ total active screen area in cm 21 carrier piston (2 screens)170 cm 2 282 cm 2SW 2/104 RTFSW 2/134 RTFSW 2/170 RTF454 cm 2SW 2/250 RTF982 cm 22 carrier pistons (4 screens)SW 4/82 RTF211 cm 2SW 4/104 RTF340 cm 2SW 4/134 RTFSW 4/170 RTF564 cm 2907 cm 2SW 4/250 RTF4 carrier pistons (8 screens)1963 cm 2SW 8/104 RTFSW 8/134 RTFSW 8/170 RTFSW 8/250 RTFLaser filter type LF 2/350Total filter surface (cm 2 ) 1470No. of heating zones 5Heating rating (kW) 18Motor rating (kW) 3,0Scraper disk speed (rpm) 1-8Max. operating pressure (bar) 350Throughput capacity (kg/h) 250-1200(see separate brochure)680 cm 21128 cm 2Technical data Erema Laser filter1814 cm 23926 cm 2Erema-„Support-Plates”HIGH TECH RECYCLING

Your advantagesFields of application for andindividual advantages resultingfrom the use of the Erema partialarea backflush filter system:Recycling● Increases screen service life, reducing screen costs and backflushmelt loss costs with new intelligent, optimised partial area backflushingsystems● Enables processing of higher levels of contaminants due tolarge active screen surface● Manages peaks in contamination● Provides higher level of automation due to automaticbackflushing function, reducing labour cost.● Improves homogenisation of the melt● Eliminates fine particles and strand breaks● Very high contamination filtering capacity available with laserfilters (see separate brochure)Fibre production● Ultra-fine filtration capability at moderate pressure levels● Effective filtering of gels (depending on application)● Dramatic increase in service life for spin pack units (candle filters)● Enables processing of higher levels of regenerateBlown film and flat film production● Effective filtering of gel-type particles thanks to low velocitiesand low shearing at screens.● Lowest possible pressure fluctuations due to partial areabackflushing and adjustable backflush stream● Enables higher levels of repellets to be processed to increasecost-effectiveness● Fully automatic filtration and filter cleaning without interruptingproductionPipe production● Reduces costs by allowing higher levels of recycling materialto be used● Maintains tight tolerances for final product even duringbackflushing● Does not interrupt production thanks to fully automatic filtrationRepellet / Masterbatch production● Hot die face pelletising: high grain uniformity even duringbackflushing (cleaning) of screens.● Strand pelletising: strands do not break off during backflushing● Uniform, steady process thanks to consistent pressure and fullyautomaticbackflushing● Improved homogenising and mixing of the processed meltmaterialEREMA - Engineering Recycling EREMA EREMA JAPAN CORP. EREMA Shanghai OfficeMaschinen und Anlagen Ges.m.b.H. NORTH AMERICA INC. R.No. 202, 1-12-1, Hiranuma, Room 1304, Tomson Financial Building,Freindorf, Unterfeldstraße 3, P.O.B. 38 23 Old Right Road - Unit#2 Nishi-Ku, Yokohama, 220-0023 710 Dong Fang Road, PudongA-4052 Ansfelden/Linz, Austria Ipswich, MA 01938 / USA JAPAN Shanghai China (200122)Phone +43/732/3190 - 0 Phone +1/978/356-3771 Phone +81/45-317-2801 Phone +86/21/6876 6201, 6876 6204Fax +43/732/3190 - 23 Fax +1/978/356-9003 Fax: +81/45-317-2803 Fax +86/21/6876 6203erema@erema.at erema@erema.net erema@erema-japan.com erema@erema.com.cnwww.erema.at www.erema.net www.erema.at www.erema.atHIGH TECH RECYCLING Subject to technical modifications. Printed 10/2004