From the Sector

ACG Kinna Automatic and ACG Nyström – members of TMAS, the Swedish textile machinery association – have delivered the first microfactory for the production of fully finished filter bags to an international filtration industry customer, in cooperation with JUKI Central Europe.

The microfactory’s configuration is based on two separate interconnecting modules – the Smart Filter Line (SFL) and the Filtermaster 2.0. The SFL handles the fabric feeding from rolls and its folding prior to seam construction, which can either be by automatic sewing, welding or with sewing and taping, depending on specifications. Very rapid changeover of the modular seaming methods can be achieved during product changes. The specific size of the now fully-tubular fabric is then precisely cut to size for each individual unit and further folded ready to be fed into the Filtermaster 2.0. The Filtermaster 2.0 then automatically attaches the reinforcement, bottom and snap rings onto the filter tube with a second Juki sewing head on a robotic arm, to form the fully finished filter bag ready for packaging.

Filter bags are employed in a wide range of industrial processes and while they may be largely under the radar as products, they represent a pretty significant percentage of overall technical textiles production.
They are used in foundries, smelters, incinerators, asphalt plants and energy production plants. Other key manufacturing fields – often where dust is generated – include the production of timber, textiles, composites, waste handling and minerals, in addition to chemicals, food production, pharmaceuticals, electronics and agriculture.

As a further example of the scale of the industry and the high volumes of fabrics involved, one supplier has delivered a single order of 30,000 filter bags to be used for flue gas cleaning at a European power plant. The bags can also be anywhere up to twelve metres in length and frequently have to be replaced.

A new research project links some of Denmark's leading researchers in PFAS remediation with artificial intelligence. The goal is to develop and optimise a new form of wastewater and drinking water treatment technology using artificial intelligence for zero-pollution goals.

In a new research and development project, researchers from Aarhus University aim to develop a new technology that can collect and break down perpetual chemicals (PFAS) in one step in a purification process that can be connected directly to drinking water wells and treatment plants.

The project has received funding from the Villum Foundation of DKK 3 million, and it will combine newly developed treatment technology from some of Denmark's leading PFAS remediation researchers with artificial intelligence that can ensure optimal remediation.

"In the project, we will design, construct and test a new, automated degradation technology for continuous PFAS degradation. We’re also going to set up an open database to identify significant and limiting factors for degradation reactions with PFAS molecules in the reactor," says Associate Professor Xuping Zhang from the Department of Mechanical and Production Engineering at Aarhus University, who is co-heading the project in collaboration with Associate Professor Zongsu Wei from the Department of Biological and Chemical Engineering.

Ever since the 1940s, PFAS (per- and polyfluoroalkyl substances) have been used in a myriad of products, ranging from raincoats and building materials to furniture, fire extinguishers, solar panels, saucepans, packaging and paints.

However, PFAS have proven to have a number of harmful effects on humans and the environment, and unfortunately the substances are very difficult to break down in nature. As a result, the substances continuously accumulate in humans, animals, and elsewhere in nature.

In Denmark, PFAS have been found in drinking water wells, in surface foam on the sea, in the soil at sites for fire-fighting drills, and in many places elsewhere, for example in organic eggs. It is not possible to remove PFAS from everything, but work is underway to remove PFAS from the groundwater in drinking water wells that have been contaminated with the substances.

Currently, the most common method to filter drinking water for PFAS is via an active carbon filter, an ion-exchange filter, or by using a specially designed membrane. All of these possibilities filter PFAS from the water, but they do not destroy the PFAS. The filters are therefore all temporary, as they have to be sent for incineration to destroy the accumulated PFAS, or they end in landfills.

The project is called 'Machine Learning to Enhance PFAS Degradation in Flow Reactor', and it aims to design and develop an optimal and permanent solution for drinking water wells and treatment plants in Denmark that constantly captures and breaks down PFAS, while also monitoring itself.

"We need to be creative and think outside the box. I see many advantages in linking artificial intelligence with several different water treatment technologies, but integrating intelligence-based optimisation is no easy task. It requires strong synergy between machine learning and chemical engineering, but the perspectives are huge," says Associate Professor Zongsu Wei from the Department of Biological and Chemical Engineering at Aarhus University.

INDA, the Association of the Nonwoven Fabrics Industry, is partnering with the Waterloo Filtration Institute to deliver the FiltXPO™ technical program on October 10-11, 2023 in Chicago, Illinois. The Waterloo Filtration Institute was instrumental in recommending program topics and world-class presenters.

Engineers, scientists, and industry professionals will gain the latest insights into the filtration and separation topics affecting the industry today and into the future. The program features presentations include: filter media technologies, advancements and opportunities in filtration machinery and equipment, innovations in clean air for homes and urban areas, standards and testing, industry trends and new developments, and filtration challenges and opportunities.

The keynote for this year’s event is “IAQ Is the New Black” presented by Suzanne Shelton, President & CEO, Shelton Group. Shelton will share the latest data around consumer views on health, safety, people, and the planet. Participants will gain an understanding of the filtration opportunities and the challenges manufacturers face in communicating the value of their products.

A preview of the subject matter experts includes:

• AAF Flanders – “Air Filter Standards Activity and What It Means for Innovation”
• Ahlstrom – “Expanding Wetlaid Filtration Media Performance Through Innovation”
• Air Techniques International – “Application of Automated Filter Tester in Quality Control Testing: Importance of Consistent Aerosol Particle Size Distribution”
• American Truetzschler, Inc. – “How Really Good Filter Media Is Made”
• CEREX Advanced Fabrics – “The Antimicrobial Nylon Advantage”
• Elsner Engineering Works, Inc. – “When Does Automation Make Sense”
• Hollingsworth & Vose – “Accelerating Membrane Adoption with ROI”
• INDA – “Beyond Porter’s Five Forces – When Regulation Reshapes Markets”
• MANN+HUMMEL GmbH – “Filtration for Cleaner Urban Mobility – Introducing Horizon Europe Innovation Action Aersolfd”
• NatureWorks – “Optimizing Biopolymers to Improve Filter Performance – A Spectrum of Approaches and Opportunities”
• Palas GmbH – “Influence of Temperature and Humidity to Filter Efficiency and Dust Holding Capacity”
• Ptak Consulting – “Residential Filtration – Performance Against Infectious Aerosols”
• The University of Georgia – “Recent Advances in Melt Blown Nonwovens and Filter Media Research”

New this year to FiltXPO are Lightning Talks. Lightning Talks are an opportunity to connect with new trends, products, innovations, and ideas with speakers rotating every eight minutes. Presenting companies include Ahlstrom, Elsner Engineering Works, Inc., Gottlieb Binder GmbH, TSI, and the Waterloo Filtration Institute.

The FiltXPO exhibition takes place October 10-12 and will run concurrently with the technical program.

INDA, the Association of the Nonwoven Fabrics Industry, announced that it is partnering with the Waterloo Filtration Institute (WFI) to produce the 2-day FiltXPO™ conference program, October 10-11, Chicago, Illinois. WFI brings decades of filtration experience, resources, and a worldwide network to support the education and technical development of the global filtration industry.

Filtration and separation professionals from the global supply chain will connect at FiltXPO 2023 for advancements, innovations, and business development. The conference portion of the FiltXPO event will focus on advanced filtration technologies and science for products that create a cleaner, healthier, and safer world. More details about the conference will be released at a later date.

The Nonwovens Institute (NWI) is a valued partner to INDA in bringing educational offerings to the nonwoven and engineered material industry. Behnam Pourdeyhimi, Ph.D., Professor and Executive Director, The Nonwovens Institute, and his team will teach the 2-day Filter Media Course in conjunction with FiltXPO, October 9-10, at Navy Pier in Chicago.

Professor Pourdeyhimi and his team will share the latest insights in the development, testing, and application of nonwovens in air, aerosol, and liquid filtration. Participants will gain knowledge about the physics of filtration, how nonwoven filter media is designed and used in air, aerosol, and liquid applications, testing standards, unmet needs in filter media, and the latest market trends and intelligence.

ITMA 2023 was a successful platform for the flat knitting machine manufacturer STOLL to present its latest new developments. The business unit of the KARL MAYER GROUP will be following up this fair on 3 July with the launch of a further innovation package. With the solutions contained in this package, STOLL will be offering its customers additional added value when using their flat knitting machines - in line with the concept of bundling innovations.

The new features include an optimised central lubrication system that reduces both maintenance effort and oil consumption, this as standard from July 2023 for all models of the CMS and ADF series produced in Reutlingen.
Compared to the previous optional variant, it ensures more efficient and comprehensive lubrication. All needle bed elements, from the holding-down jack to the coupling part and intermediate slider to the selection jack, are now supplied with oil. The machine itself recognises whether lubrication is required. Independently of this, the lubrication intensity and oil distribution can be adapted to the individual machine conditions by setting various parameters, if required. To ensure that the required amount of lubricant is reliably supplied, a message is sent if the level is too low.

In addition, a new oil drain container as standard equipment for all CMS and ADF models catches used oil from the needle bed under the machine. This prevents soiling of floors or knitted fabrics. The emptying of the container can be efficiently managed by an adjustable reminder function. The neat and at the same time sustainable solution does not require cleaning agents or hoovers and offers the possibility to reuse the oil after cleaning through special filters, if necessary.

Users of CMS and ADF belt take-down machines can benefit from optimisations around the belt take-down. Thanks to the new STOLL innovation package, this can be turned forwards and backwards by means of a switch as standard in order to easily eliminate fabric wraps and thus reduce maintenance times. In addition, a mirror, which is also fitted as standard, ensures a simple visual check of the belt take-down.

Another solution of the STOLL innovation package from July 2023 includes new cams that enable split-stitch implementation without cam box modification. This reduces manual effort and thus conversion times and costs. The feature is standard on all fine gauges ADF and CMS machines.

For the W machines from STOLL, there is now a further inlay yarn carrier, the Qt, in addition to the previous Qw yarn carrier. The extension means that the number of inlay yarn carriers used in a system can be increased from the previous one to three. No additional system is required for the weft yarn, and the process steps weft yarn insertion and knitting take place in the same system.

INDA, the Association of the Nonwoven Fabrics Industry, announced that registration is open for FiltXPO™ 2023, Oct. 10-12, 2023, Navy Pier, Chicago, Illinois USA. More than 130 exhibitors from the filtration supply chain will showcase their solutions, technologies, and innovations to over 1,200 global professionals. FiltXPO will also feature a three-day technical program covering new technology, products, and research.

Exhibit stand reservations have been brisk, exceeding the prior two editions of FiltXPO. “We are pleased to see the strong interest in exhibiting at FiltXPO. It speaks to the strength of the industry and that filtration products continue to evolve for clean air and water, as well as safer food, beverages, and biopharmaceuticals,” said Joe Tessari, Associate Director of Exhibit Sales.

An important part of the FiltXPO event is the 1.5-day Filter Media Training Course. Participants will learn about the physics of filtration, how nonwoven media is designed and used in air and liquid filtration, the latest market trends, which applications have unmet needs, as well as testing standards.

Das 16. Symposium TEXTILE FILTER des Sächsischen Textilforschungsinstituts e.V. (STFI) fand am 14. und 15. März 2023 im Hotel Chemnitzer Hof, Chemnitz, statt. Mussten vor drei Jahren wegen coronabedingter Reisebeschränkungen noch einige Vorträge über Videokonferenz gehalten werden, konnten in diesem Jahr knapp 100 Teilnehmer in Präsenz vor Ort sein. Im Rahmen des Symposiums wurden insgesamt 18 Vorträge und vier Pitch-Vorträge gehalten. Parallel wurde das Symposium von einer Fachausstellung begleitet, in der zehn Aussteller ihre Produkte und Services zeigten.

Der erste Vortragskomplex widmete sich den Themen Nachhaltigkeit, Kreislaufwirtschaft und Life Cycle Analysis (LCA). Herausgestellt wurde dabei, dass zum Vergleich der Prozesse, Materialien und Produkte die nationale und internationale Normung und Standardisierung sowie für die wirtschaftliche Durchführung die Automatisierung der LCA grundlegende Voraussetzungen sind. Außerdem wurde klargestellt, dass ein ehrlicher Vergleich der existierenden Vor- und Nachteile der biobasierten gegenüber den erdölbasierten Rohstoffen erforderlich ist.

Während der Coronakrise kam es auch in der Textilindustrie zu einem Zusammenbruch der Lieferketten. Die Lieferketten erholen sich, dafür wird die Wirtschaft gegenwärtig durch eine Energiekrise gebeutelt. Alternative Energiequellen wie Wasserstoff sind leider noch nicht ausgereift und stehen für eine umfassende Nutzung nicht bereit. Ansätze, um Energie einzusparen, sind Minimalauftragsverfahren in der Ausrüstung, die Wärmerückgewinnung, das Recycling oder die Einsparung von Verpackungen für den Transport.

Ein weiter Themenkomplex des Symposiums widmete sich der Normung und Standardisierung der Filterprüfungen. Zu erwähnen sind hier die Prüfung von Luftfiltern in Kombination mit Brandschutz für Züge, die Prüfung von Luftfiltern für Haushalt, öffentliche Räume und Industrieanlagen oder die Entwicklung von Labortestverfahren zur beschleunigten Alterungsprüfung von mobilen Entstaubungsanlagen.

Mehrere Vorträge hatten die Modellierung und Simulation von Prozessen der Vliesstoffherstellung (z. B. die virtuelle Produktion, Beeinflussung der Wolkigkeit von Extrusionsvliesstoffen oder die Verteilung von Spinnfasern und -filamenten), den Aufbau und die Charakteristik von Filtervliesstoffen (z. B. Flächenstruktur, Druckverlustkurve, Partikeltransport und -adsorption) sowie die Aerosolverteilung bzw. die Filtereffektivität in Abhängigkeit der Platzierung der Luftfilter im Raum zum Inhalt.

Auf dem Symposium wurden zudem auch verschiedene neue Materialien und Produkte vorgestellt. Dabei sind besonders hervorzuheben:

• Flüssigkeitsgefüllte Hohlfasern für die Abwasserreinigung
• Neue Spezialpapiere für Luftwärmeüberträger, bei dem ein kräuselfähiges Mikro-/Nanofasermu-
• ltifilamentgarn mit Einzelfaserdurchmessern von < 1,0 μm Fasern nach dem Island-in-the-Sea Schmelzspinnverfahren hergestellt werden
• 3D-Absorbervliesstoffe mit integrierter Gassensorik (PAKs) für die Schutzbekleidung von Einsatzkräften im Bereich Feuerwehr
• Getuftete Filterstrukturen kombiniert mit leitfähigen Interdigitalstrukturen für die Luftfiltration
• Kompakte Luftfilterelemente und deren Optimierung
• Einsatz von Ionisatoren für die Aerosolabscheidung im Filter

Abschließend stellte das STFI in eigener Sache geplante bzw. bereits realisierte Investitionen vor, die die technisch/technologische Basis und die Prüfkompetenz des Institutes erweitern. In Kurzvorträgen wurde die Errichtung einer Nassvliesanlage mit 600 mm Arbeitsbreite vorgestellt, die besonders für den Filterbereich und das Forschungsfeld Textilrecycling neue Entwicklungen ermöglichen wird. Für den Bereich Nähwirktechnik wurde eine neue Maliwatt- Maschine mit optimierter Arbeitsstelle investiert. Die Errichtung eines Prüfstandes für FFP2-Masken, der auch für die Prüfung von Filtern eingesetzt werden kann, erweitert die Prüfkompetenz des Hauses erheblich. Sein variabler Aufbau ermöglicht auch die Prüfung von neuentwickelten Vliesstoffen, deren Konstruktion durch Simulation optimiert wurde.

The American company WPT Nonwovens invests in a new thermobonding line for filter media. Trützschler Nonwovens teamed up with Schott & Meissner to deliver a state-of-the-art, high-capacity line including the T-BLEND fiber preparation system, two TWF-NC roller cards and Schott&Meissner’s high-speed “Speedliner” belt oven.

Air conditioning systems are not only an integral part of many buildings all over the world. They are vital components in cars, trucks, planes and other. Home and Vehicle Air Conditioning (HVAC) systems often rely on thermo- or through-air bonded nonwovens for air filtering.

WPT Nonwovens is a specialist not only for filtration media but also for nonwovens used in the medical, hygiene and industrial sectors. The US-based company started its business in 2008 and quickly became a trusted supplier of spunbonded, needle-punched, wet-laid and carded nonwovens.

To enable further growth, WPT Nonwovens now decided to invest in a new through-air bonding line. The Trützschler machinery has been selected to ensure reliable fiber preparation and web forming processes for various special, technically demanding filtration media.

The start-up of the through-air bonding line is planned for the 3rd quarter 2023.

Over the past three years, a dedicated AI development team at BTMA member Shelton Vision has been developing tailored machine learning solutions for the textiles industry.

The aim has been to elevate the detection process and the accuracy of naming and grading subtle defects in textiles, in real time within production environments.

“Big Data ‘off-the-shelf’ systems such as those behind technolgies like facial recognition and Google Maps involve reading many thousands of single images each second and simply take too long to accumulate sufficient data for what’s required in this specific case,” says Shelton Vision CEO and Managing Director Mark Shelton. “A feature of the textile industry is that in many sectors, the product range changes several times within a year and it is not uncommon to have to inspect hundreds, if not thousands of different styles in a year based on precise settings.”

In terms of defect types, he adds, there may typically be over 100 that need to be accurately detected, classified (named) and graded in real time.

“Added to this is the need to ‘filter out’ the random occurrence of ‘non defects’, such as loose threads, lint and dust on the surface – the number of which can be higher than actual defects – and it is clear that a bespoke system is required.”
The development team has consequently established metadata for identifying defect properties, enabling the successful identification of faults from a much smaller number of images.

“The system employs a unique combination of machine learning for automated style training and novel algorithms for defect detection, to provide high quality images for the AI real time defect classification and grading software,” Shelton explains. “Due to the inherent variation in fabric features – raw materials, construction, texture, colour and finishes, as well as the differing product quality standards in value chains and the regional variations in what defects are called – our AI engine uses models built for each individual company or group of companies, or product value chain.”

The AI models are constructed so that the user operatives can populate them with their own data produced by the vision system or by obtaining defect images from another imaging source (eg a mobile phone camera).  

The occurrence of defects is sporadic and many defect types occur infrequently, although when they do, they can have severe consequences. These scenarios re-enforce the need for the AI engine to be quickly set up and able to operate accurately with limited data sets of typically between 30 and 50 good quality images per defect type.

A further feature is a tool enabling the user to periodically ‘clean up’ the AI data during the set up phase. This is used to resolve conflicting data and to correct mis-named images.

Generally, the highest cost component of fabric production is the raw material and in addition to finished product inspection, a cost effective use for vision systems is in process operation.

Generally, the highest cost component of fabric production is the raw material and in addition to finished product inspection, a cost effective use for vision systems is in process operation.

“There is a need for the real time detection of defects that are being created in separate processes, such as printing or coating and for real time automated systems that can accurately determine the defects and their severity and provide a reliable signal for an operative to rectify the issue, This can result in considerable savings.

Prior to Shelton introducing powerful customised machine vision and real time defect classification, the only systems available were those that required manual sifting through vast numbers of images, which included both real defects and ‘non defect’ images. The task was very often overwhelming and did not provide much benefit beyond manual fabric inspection.

Monforts will highlight its technologies for special technical textile applications at this year’s ITMA ASIA + CITME which takes place at the National Exhibition and Convention Center in Shanghai, China, from November 20-24.

One of Monforts' developments is the Montex 8500 XXL stenter system for the production of technical fabrics in widths of up to 6.8 metres. Among the products made on this system are treated nonwovens for the geotextiles and filter media markets, tarpaulins, advertising banners, black-out curtains, membranes and many more.

On Montex©Coat coating lines, meanwhile, the possibilities range from the single-sided application of finishing agents for outdoor clothing and adding functionality to home textiles, to the creation of materials for sophisticated lightweight construction and automotive and aerospace components.

“Many more applications are possible, such as the overdyeing of denim, the creation of double-face coated materials, fabrics awnings, tents and medical drapes and the pre-treatment of substrates for digital printing”, explains Gunnar Meyer, Monforts area sales manager for China. “A range of different doctor blades and their combinations can be supplied to meet individual requirements, including air knife, roller knife, foam, screen and magnetic roller coating. The latter option is recommended for lines with working widths of over 2.4 metres.”

In addition, Monforts can provide the necessary explosion-proof ranges for solvent-based coatings and high temperature processes up to 320°C, such as the PTFE coating of nonwoven filter material. These lines are equipped with special burners, stenter chains, and insulation.