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Environmental news and technical  innovation in the nonwovens sector
Filtration Group highlighted its far-reaching capabilities following a sustained series of acquisitions in recent years.

Filtech 2018 demonstrated the current buoyancy of the filtration industry and the key role nonwovens play within it. Adrian Wilson reports.

In her keynote address at the Filtech 2018 conference and exhibition, held in Cologne, Germany, in March, Dr Christine Sun, chair of the American Filtration Society (AFS), said that the global filtration industry now has an annual value of over US$80 billion.

Of the various filter media materials employed by the industry, nonwovens now account for around 37% by volume, according to AFS projections.

“Sustainable development is behind all filter media R&D activity and the introduction of new products,” Sun said, citing recent innovations such as the products based on glass-free substrates and multi-layered PET materials launched in response to the demands of new fuels and biodiesels as examples.

She added that membranes, employed for finer filtration that cannot be achieved by conventional fabrics, also account for 23% of the filter media market.
 However, given that nonwovens are generally used as separation layers and reinforcements for membranes, nonwovens can be considered to be employed in media for the entire spectrum of filtration performance requirements.

The use of nanofibres is also closing the gap between membranes and nonwovens, with a leader in the field, South Korea’s Finetex, for example, now producing pure synthetic nanofibre media to E12 levels of performance (99.5% particle capture) and making them suitable for HEPA (high efficiency particle air) filtration applications.

Expansion

Finetex has significantly expanded its global capacity from its original base in South Korea, and now has additional major plants in the Philippines and Canada, both of which are in the process of being further expanded. It has also formed a joint venture in Wuxi in China, which became operational at the end of 2017 and is now also being expanded.

As such, the company reported a sales increase of 41.6% in 2017 compared to 2016, to Won 63.5 billion, with year-on-year operating profit up a total of 237% at Won 1.8 billion, as the company’s new commercial capacities have started up both in Asia and North America.

Finetex director of sales and marketing in Europe, Karl Luukkonen, said the company’s products fell into two major categories, low weight coatings of between 0.05gsm and 0.3gsm and heavier materials of around 7gsm.

“We have 650 patents covering nanofibre production, in addition to many related to end-use applications and our technology is capable of the industrial-scale production allowing us to achieve the price points the markets are willing to pay,” he said.

In addition to their higher levels of filtration, the benefits nanofibres can bring to industrial markets include overcoming the restrictions of electrostatically-charged filter media and reducing the use of glass fibres.

The company has conducted tests at seven coal power plants to prove the benefits of its nanofibre filters, while the new plant in Wuxi has an initial focus on automotive filters, which it expects to add revenues of between $10-25 million annually once fully utilized.

“In general we are anticipating very good business expansion in industrial filters globally, given the new focus on air quality and fine dust becoming a social issue,” said Finetex CEO Jongchul Park. “With the implementation of the new ISO16890 standard we are seeing increased demand for our products from existing customers, in addition to securing significant new business.”

$1 billion business

AAF Flanders also employs nanofibres in its air filters and is part of a global business currently being established which will have annual sales of around $1 billion, following two recent acquisitions by parent company Daikin Industries.

Daikin is a Japanese multi-national air conditioning manufacturing company headquartered in Osaka and had sales in 2017 of $18.5 billion. It is basing its filtration business on American Air Filter Company (AAF), headquartered in Louisville, Kentucky, acquired by Daikin in 2007 and Nippon Muki, headquartered in Tokyo and acquired in 2009.

Through AAF, Daikin acquired air filter manufacturer Flanders Holdings, of Washington, North Carolina, for $430 million in April 2016 and the two companies have now merged to become AAF Flanders, offering comprehensive air filtration solutions.

In December 2016 Daikin subsequently acquired Swedish air filter manufacturer Dinair AB, with operations in Sweden, Finland and Latvia, to expand its reach into northern Europe.

Future synergies with the air conditioning business are anticipated as the filter business is being transformed into a core Daikin business as a third pillar behind air conditioning and chemicals.

Offshore energy

Filtration Group is another company which has emerged as an industry leader via a series of acquisitions – no less than 16 of them since 2009 – and at this year’s Filtech drew attention to a range of its innovations, including the use of Filtrair Dropsafe M6 pocket filters in offshore oil and gas turbines.

One big customer is Norway’s Wide Industrier, which supplies its GE LM2500 gas turbines for compressor drives and electrical power on offshore platforms to companies such as Statoil – Europe’s second biggest gas supplier and its largest operator of oil and gas facilities.

On oil and gas offshore platforms, Statoil has operated three-stage high performance air intake systems which are gradually being retrofitted with the two-stage AS Wide Infidry units containing Filtrair Dropsafe M6 pocket filters to both extend the operational life of the filters and the efficiency of the air intake system.

 Such a retrofit significantly increases compressor efficiency while reducing salt contamination and corrosion.

Filtrair Dropsafe M6 pocket filters combine a particle filter, a coalescing filter and water and salt removal in a single device and the self-supporting, leakage-free welded pockets retain their shape even if there is an increasing loss of pressure, or in the presence of moisture or contamination.

The filter media is based on a copyright-protected hydrophobic material which is elastic in water and the pleat design which gathers water inside the pockets and empties it into a container installed upstream of the filter is also patented.

Flexline

As a sure sign that Filtech continues to build momentum, of the total of 380 exhibitors, no less than 150 were not present at the last Filtech show in 2016, including some very big industry players such as BWF, Pall Corporation and Porvair.

Also not at Filtech 2016 was Mann+Hummel, which with annual sales of around €3.5 billion, employs over 20,600 people at 80 locations in 28 countries, and is a leader in filtration for the automotive industry.

At Filtech 2018 the company introduced its new Flexline range of air filters for engine compartments where installation space is becoming extremely limited as a result of new performance components such as turbochargers and diesel particle filters.

“Better utilisation of the design space allocated by the OEMs is required to fulfil their increasing demands on engine air filter systems,” said vice-president of corporate communications Harald Kettenbach. “Designers and engineers now have to haggle over millimetress of space.”

Compact

Flexline is a series of compact, performance-enhanced filters with variable designs made possible by laser cutting, as well as the relocation of clamping elements such as clips or screws to the inside of the air cleaner system, in order to reduce the external contours and avoid blocking other elements in the confined spaces.

Panel air filters based on rectangular, trapezoidal and polygonal forms with straight lateral edges are currently the dominant filter designs, but Flexline filters have curved external contours with larger flow surfaces. This provides new scope for development to achieve targeted improvements in the filtration characteristics or pressure loss.

Flexline elements are also flatter than conventional products for either a flatter housing or an increased pleat height.

A further advantage in terms of optimisation of the intake system is that acoustic performance is improved due to the increased compactness of the air filter housings.

Streetscooter

Mann+Hummel also displayed one of the first special Streetscooter delivery vehicles which are currently being trialed in selected German cities by Deutsche Post DHL Group, the world’s largest postal service.

These vehicles are equipped with the company’s fine dust particulate filter – representing an entirely new use for nonwoven filter media and a new filter class in the automotive industry.

“We are embracing all new forms of transportation currently being developed because there will be many new opportunities for us to develop solutions with electric cars, autonomous vehicles and beyond,” said Harald Kettenbach at the show. “Electric vehicles are not as yet free of emissions because they release particulates into the atmosphere due to tire, brake and road abrasion. These contribute significantly to pollution in cities.

Frequent braking

“This new filter prevents emissions directly at the source of fine dust to the ambient air, in particular in city traffic, which is characterized by frequent braking processes. As such, it represents a major opportunity for cost-effectively reducing pollution.”

Streetscooter’s vehicles were developed at Aachen University and the spin-off company has subsequently become a dedicated subsidiary of DHL.

“With these new fine dust particle filters we can further improve the environmental performance of our vehicles and we are pleased to be pioneering what we believe will become a major trend,” said Streetscooter CEO Achim Kampker.

Reemay

As the world’s leading nonwovens manufacturer, Berry Global is also well-known in the filtration industry for its Reemay fabric – a unique spunbond polyester based on trilobal fibres that provides 67% more surface area than media based on round fibers and increases the interaction between particles and the fiber surface. Reemay fabric also eliminates the need to point-bond and the creation of points that can restrict airflow.

At Filtech 2018, the company also promoted its patented Meltex meltblown technology. Meltex is an ultra-uniform meltblown and the media of choice for critical applications in highly-regulated markets where filtration accuracy is most important. It is available in a wide range of basis weights from 12 to 200gsm and is able to meet requirements in life science filtration through a range of polypropylene and PBT grades.”

In addition Berry highlighted a specific product range for the filtration of cooking oil, with the ability to maintain a minimum 40% wet tensile strength after 60 minutes at 180ºC immersed in oil. The materials in this range include INT viscose chemically-bonded media which have a parallel web structure, Reemay 2014 PET spunbond and FC 100, a crosslaid, chemically-bonded viscose nonwovens.

Nanowave LT

Hollingsworth & Vose, headquartered in East Walpole, Massachusetts, demonstrated the efficiency of its extended-surface Nanowave LT for achieving low pressure drop across all ISO 16890 air filtration levels.

At the new ePM1 filter level, NanoWave outperforms standard synthetics, premium meltblown and glass mat nonwovens in terms of energy usage, with comparable performance to glass at ePM2.5.

The company also points out that  NanoWave filters last longer than conventional glass media, and the high-loft media offers twice the dust-holding capabilities of traditional synthetic media, resulting in a more efficient and economic filter.

Additionally, NanoWave’s high stiffness and updated design allow proper filter bag opening, and the material retains its shape in variable HVAC systems, reducing set-up times and increasing productivity.

Nylon 6.6

Cerex, based in Cantonment, Florida, is a manufacturer of specialised spunbond nonwoven media based on nylon 6.6.

Among other applications, the company’s fabrics can prevent catastrophic filter media failure caused by ethylene glycol contamination in engine lubrication oils.

“Coolant contamination is a real issue,” said the company’s sales manager John Hancock, “and the majority of lubricant professionals say glycol contamination has caused serious problems for their company’s equipment. At typical engine temperatures, polyester spunbond fabrics immediately begin to deteriorate, but nylon doesn’t, which can help filters achieve considerably longer filter intervals.

“All of our fabrics exhibit excellent uniformity, plus high tensile and tear strength, even at low fabric weights. The thermal stability of our nylon fabrics is outstanding, having high melt points (500°F) and resisting attack by many solvents, alkalis, and dilute acids used in manufacturing processes. Our fabrics have provided product design flexibility to engineers worldwide in many areas including burst strength improvements, lowered delta p performance, reduced media and contaminant migration, and greater fiber integrity under higher temperature environments.”

Uniform PET

Multitexx based in Herdecke, Germany, promoted its uniformly-calendared spunbond of polyester (PET) spunbonded nonwovens  whose properties can be tailored to fit many applications and specific requirements in weights of between 15-150gsm.

The outstanding characteristic of these spunbonds is their particularly uniform structure even at low weights.

Colback

Low & Bonar, meanwhile showcased its Colback nonwovens and Enka 3D mats for filter reinforcement and spacer products. Colback is made of bicomponent, mechanically-drawn endless filaments with a unique sheath/core composition.

Its polyester core gives it an unmatched strength and dimensional stability while sheath options include PA6, polypropylene or polyester, each with specific benefits in filtration applications.

Colback fabrics are through-air bonded, with no glue or chemical binders involved, ensuring maximum air permeability and dimensional stability – two important parameters for filter makers and users.

Additionally, in comparison to spunbonds, the production process allows flexibility in manufacturing widths and enables small batch sizes.

The open structure, uniformity and high stiffness of Colback is a winning combination. The open structure ensures a decreased pressure drop and energy cost-saving opportunities. The material’s stiffness meanwhile ensures sharp and stable pleats.

The material works particularly well as a support carrier. Enka 3D multi-dimensional entangled filament products are made from polyamide, polyolefins or polyester and sustain a wide range of profiles, combinations, weights and thicknesses.

In industrial liquid mist separators, air and waste water treatment systems, a high contact surface area is the key to scrubbing contamiants from waste air or water streams. Due to its 95% open spacing, Enkamat allows for optimal flow, as well as providing and excellent surface area for high efficiency removal systems.

Debutees

Among other nonwovens companies appearing at Filtech for the first time this year were:

·       Abalioglu Teknoloji (Turkey)

·       Autotech Nonwovens (Germany)

·       BWF Envirotec (Germany)

·       Clean & Science (South Korea)

·       Enkev (Netherlands)

·       Fibertex Nonwovens (Denmark)

·       Filtech Nederland (Netherlands)

·       Great Wall Industrial (China)

·       Knowlton Technologies (USA)

·       Lantor (Germany)

·       Mila (Poland)

·       Multitexx (Germany)

·       Nanowetlaids (Germany)

·       Nax Nano (Germany)

·       Noam Urim (Israel)

·       NXT Nano (USA)

·       ORV (Italy)

·       SWM (USA)

·       Thrace (Greece)

 Filtech 2019 will be held 22-24 October in Cologne, Germany. 

www.filtech.de

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