Coming from the extruder the contaminated plastic melt flows via a circular distributor ring into the housing between two parallel configured laser-drilled screen discs.
The melt is pressed through the screen discs, flows through and leaves the filter in a clean state via the collection channel.
The contaminant particles collect on the screen as the melt flows through. A scraper disc with three scrapers on each side rotates between the screen discs. The pressed on scrapers lift the contaminants immediately from the smooth, hardened screen discs and forward them directly to the discharge system.
The Laserfilter lets the melt flow unhindered. This is the free flow concept in a nutshell. The key to success: short dwell times, static screens and a highprecision scraper which rotates only in the area of the melt which is still contaminated – while maintaining constant pressure.
As soon as the melt is freed from its contaminants and flows into the clean section, its flow is not disturbed by any moving or rotating parts. This functional principle avoids dead spaces with short dwell times and prevents „black spots“ from resulting.
One strong efficiency benefit of the Laserfilter is its high screen cleaning frequency. This is because three scrapers are available in every rotation to lift the contamination from the screen immediately and forward it to the coaxial discharge screw without delay. This ensures that the contaminant particles only spend an extremely short time on the screen. The screen holes are, therefore, quickly free again to filter new melt. Thanks to this continuous scraping, the filter achieves high throughput rates even when the melt is heavily contaminated
The Laserfilter screen is a clear and reliable line between contaminated and clean material. Because, thanks to the static design of the screen, it can be perfectly sealed, thus preventing any filtered contaminants from getting into the high-grade plastic melt. This is a significant benefit over many traditional filter systems in which the screen rotates and a seal represents a bigger challenge. In short: EREMA Laserfilter – top level, reliable filtration
The scraper and discharge screw speeds depend on the pressure and are controlled fully automatically („constant pressure operation“).
The optimised scraper technology ensures that the contaminants are discharged in a controlled manner and with only a minimum of melt – up to 50% thickening is possible.
The high-performance filter has the contaminants of a multitude of different plastics perfectly under control. The spectrum ranges from post-consumer and post-industrial applications with higher degrees of contamination to relatively clean PET material.
Post Consumer
The current trend which can be observed in the direction of „poorer“ input material will continue. Films are becoming thinner and thinner in order to reduce packaging weight. However, the relative share of contaminants such as paper labels, for example, which have to be removed in the course of processing increases as a result. High-performance filtration is thus becoming more and more a key function in plastics recycling systems. The Laserfilter is the ideal solution for this task.
Better for PET
The EREMA Laserfilter is also playing an increasing role in the PET sector. The reason for this is that the increased use of rPET in end products requires high process stability. This stability is also required if the degrees of contamination increase – which is currently the case. The benefits of the Laserfilter: it processes input material with a degree of contamination of over one per cent without any difficulty. The functional principle avoids dead spaces and makes for short dwell times, which in turn prevents „black spots“ with PET.
A system of this kind, which offers high melt and recyclate quality, has clear benefits especially in the case of food contact grade applications. Another argument which underpins the costeffectiveness of the Laserfilter: whereas the melt losses with piston filters are usually between one and two per cent, it has been possible to reduce them to clearly below one per cent with the Laserfilter thanks to the newly developed discharge unit.
Whether it is paper, wood, aluminium or copper – the EREMA Laserfilter removes undesired impurities from the plastic melt reliably for you. It is also the ideal solution for the efficient filtering of rubber, silicone and foreign polymers such as PET or PA (in polyolefin recycling). What‘s more: it is a high-performance filter which additionally stands out through remarkably strong throughput.
RUBBER & CO.: The Laserfilter is a real specialist when it comes to removing rubber-like, nonmelting contaminants like silicone or linked polymers. This is because, whereas these contaminants can slip through the screens of traditional systems due to pressure and a longer dwell time on the scraper, the Laserfilter has an effective means of dealing with this undesired effect. We call it continuous screen cleaning. In this process, rubber & co. are lifted off the screen immediately again by the scraper star and conveyed out reliably via the discharge screw.
Perfect design, high-precision manufacturing and a robust build.
Flat, straightforward design and 1.5 mm thick. The property spectrum of the filter screen made of hardened special steel is second to none. Because, thanks to its robust design and mechanical stiffness, the quality product even deals with stubborn contaminants with no trouble at all and stands out through a long service life. As a result, considerably fewer screen change processes are necessary, and the ones which are required are carried out in no time at all. Compared to screens with a cylindrical design, the flat design comes with another economic benefit: it can be manufactured relatively easily and thus, by comparison, more cost-effectively.
Flat screen, straightforward design
Robust: made of hardened special steel, wall thickness around 1.5 mm
Excellent mechanical stiffness
Thousands of ultrafine drilled holes, filtration fineness up to 70 μm
Thanks to the flat design the screen can be made easily and inexpensively compared to screens with a cylindrical design
The screen does not turn, instead it is used statically so there is a perfect seal between contaminated and clean melt
Notably fewer screen changes as a result
The screen discs are made at the EREMA Group subsidiary 3 S in Austria – a company known for its high manufacturing quality.
LASER TECHNOLOGY
The Laserfilter gets its name from the filter screen. Advanced laser technology cuts thousands of ultrafine holes into a hardened special steel disk. A self-cleaning effect is achieved through the conical shape of the holes. The filtration fineness reaches up to 70 μm.
Perfect design, high-precision manufacturing and a robust build – the scraper star and discharge system are a dynamic duo with precise interaction. Together they are responsible for continuous screen cleaning, high throughput even with heavily contaminated melt and top filtration reliability. Turn after turn. Thanks to the innovative scraper geometry and the directly connected discharge channels any contaminants are lifted from the screen immediately and forwarded to the coaxial discharge screw. The high quality of the parts is ensured by extremely wear-resistant materials and fabrication by the specialists 3 S – an EREMA Group subsidiary.
Rotating scraper disc for self-cleaning enables days and weeks of continuous filtration
Ensures better discharge capacity – lowest melt losses through increased thickening
Considerably longer screen service life through increased cleaning efficiency
Top-quality scraper elements made in highly wear-resistant material
The screen elements are made at the EREMA Group subsidiary 3 S in Austria – a company known for its high manufacturing quality
Through contact pressure of the scraper on the filter surface
As the screen is harder than the scrapers
Continuous screen cleaning
Not just one but three knives are located on each side of the continuously rotating scraper star. Every contaminant particle only comes into contact very briefly with the screen as it is picked up by one of three knives, lifted and conveyed immediately to the discharge system; this means that it is difficult for so-called „soft particles“ such as rubber or silicone contaminants to pass through the screen. Moreover, the rapid lifting of the particles prevents an undesired grinding effect of the contaminants.
CLEAN MELT. THE SMART WAY.
DischargePro. The new, particularly sophisticated control system of the EREMA Laserfilter gets more out of it for you. Continuously! Greater efficiency, more stable processes and increased operating convenience with reduced time and labour costs. Another plus: depending on the application and contamination, the new control system reduces melt loss during filtration by up to 50 %*)for more recycled pellets and efficiency.
CONSISTENT THICKENING, CONSTANT PROCESS.
The new discharge control system reacts to fluctuations in contamination in the input material by constantly adjusting the rotation speed of the filter scraper disc and discharge screw as required. This smart innovation ensures consistent thickening during melt filtration - an important parameter for a constant and economical process.
*) compared to the previous EREMA Laserfilter control system, depending on application, material, degree and type of contamination, etc.
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DischargePro Control.
Smart advantages:
QUALITY AT ITS BEST.
Already proven, now even larger. The area of the screen on the new EREMA 2/406 laserfilter is 50 % larger than on the 2/354 laserfilter. A strong advantage when melt quality and filtration fineness are at the top of the agenda. The increased screen area means that significantly more melt can be filtered per unit of time for applications where throughput is the key factor. Now you get even better results in quality-sensitive plastics applications.
BORN TO RUN.
LASERFILTER 2/356 & LASERFILTER 2/406.
The new Laserfilter 2/356 is the well thought-out optimisation of its predecessor model, the Laserfilter 2/354. In terms of ease of operation and safety, the 2/356 takes its cue from the larger 2/406 series – and makes no compromises when it comes to robustness, reliability and productivity. True to the Laserfilter credo „Born to run“.
EREMA Laserfilter 406.
More area, more advantages.
ALSO WITH HIGH LEVELS OF CONTAMINATION
WITH THE SAME THROUGHPUT
DUE TO LOWER PRESSURE AND TEMPERATURE AT THE SAME THROUGHPUT
With the shut-off slider option (available starting with the TWIN model) the machine continues to produce when one of the screens has to be changed. Thanks to the shut-off slider, the melt flow is stopped via the left filter. The screens on this filter can be changed while the right filter continues to produce.
Up to 9,000 kilograms of filtrated melt per hour. The brand new EREMA Laserfilter LF 406 QUATTRO is a real top performer and sets the standard in terms of throughput. But the series not only delivers remarkable, compelling performance at the top end of the scale. Because whether it is SINGLE, TWIN, TRIPLE or QUATTRO – every individual design ensures you have high-capacity melt filtration even with high degrees of contamination. Your specific requirements and desired throughput finally decide which solution is the best for you.
LF 2/406
Total filter area: 1950 cm²
Scraper disc speed: 1–10 rpm
Max. operating pressure: 320 bar
Throughput capacity: 300–3000 kg/h
Total filter area: 1295 cm²
Scraper disc speed: 1–10 rpm
Max. operating pressure: 320 bar
Throughput capacity: 200–2000 kg/h
LF 2/406 TWIN
Total filter area: 3900 cm²
Scraper disc speed: 1–10 rpm
Max. operating pressure: 320 bar
Throughput capacity: 1200–5200 kg/h
Total filter area: 2590 cm²
Scraper disc speed: 1–10 rpm
Max. operating pressure: 320 bar
Throughput capacity: 800–3500 kg/h
LF 2/406 TRIPLE
Total filter area: 5850 cm²
Scraper disc speed: 1–10 rpm
Max. operating pressure: 320 bar
Throughput capacity: 2700–6900 kg/h
Total filter area: 3885 cm²
Scraper disc speed: 1–10 rpm
Max. operating pressure: 320 bar
Throughput capacity: 1800–4600 kg/h
LF 2/406 QUATTRO
Total filter area: 7800 cm²
Scraper disc speed: 1–10 rpm
Max. operating pressure: 320 bar
Throughput capacity: 3700–9000 kg/h
Total filter area: 5180 cm²
Scraper disc speed: 1–10 rpm
Max. operating pressure: 320 bar
Throughput capacity : 2500–6000 kg/h
