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Firefighter Photo: 12019 at Pixabay
11.12.2023

Study tests firefighter turnout gear with, without PFAS


Transitioning away from per- and polyfluoroalkyl substances (PFAS), which offer water- and oil-repelling properties on the outer shells of firefighter turnout gear, could bring potential performance tradeoffs, according to a new study from North Carolina State University.

The study showed that turnout gear without PFAS outer shell coatings were not oil-repellent, posing a potential flammability hazard to firefighters if exposed to oil and flame, said Bryan Ormond, assistant professor of textile engineering, chemistry and science at NC State and corresponding author of a paper describing the research.

“All oil repellents can also repel water, but all water repellents don’t necessarily repel oil,” Ormond said. “Diesel fuel is really difficult to repel, as is hydraulic fluid; in our testing, PFAS-treated materials repel both. In our tests, turnout gear without PFAS repelled water but not oil or hydraulic fluid.


Transitioning away from per- and polyfluoroalkyl substances (PFAS), which offer water- and oil-repelling properties on the outer shells of firefighter turnout gear, could bring potential performance tradeoffs, according to a new study from North Carolina State University.

The study showed that turnout gear without PFAS outer shell coatings were not oil-repellent, posing a potential flammability hazard to firefighters if exposed to oil and flame, said Bryan Ormond, assistant professor of textile engineering, chemistry and science at NC State and corresponding author of a paper describing the research.

“All oil repellents can also repel water, but all water repellents don’t necessarily repel oil,” Ormond said. “Diesel fuel is really difficult to repel, as is hydraulic fluid; in our testing, PFAS-treated materials repel both. In our tests, turnout gear without PFAS repelled water but not oil or hydraulic fluid.

“Further, oils seem to spread out even more on the PFAS-free gear, potentially increasing the hazard.”

PFAS chemicals – known as forever chemicals because of their environmental persistence – are used in food packaging, cookware and cosmetics, among other uses, but have recently been implicated in higher risks of cancer, higher cholesterol levels and compromised immune systems in humans. In response, firefighters have sought alternative chemical compounds – like the hydrocarbon wax coating used in the study – on turnout gear to repel water and oils.

Besides testing the oil- and water-repelling properties of PFAS-treated and PFAS-free outer garments, the NC State researchers also compared how the outer shells aged in job-related exposures like weathering, high heat and repeated laundering, and whether the garments remained durable and withstood tears and rips.

The study showed that PFAS-treated and PFAS-free outer shells performed similarly after exposure to UV rays and various levels of heat and moisture, as well as passes through heating equipment – similar to a pizza oven – and through washing machines.

“Laundering the gear is actually very damaging to turnout gear because of the washing machine’s agitation and cleaning agents used,” Ormond said.

“We also performed chemical analyses to see what’s happening during the weathering process,” said Nur Mazumder, an NC State doctoral student in fiber and polymer science and lead author of the paper. “Are we losing the PFAS chemistries, the PFAS-free chemistries or both when we age the garments? It turns out that we lost significant amounts of both of these finishes after the aging tests.”

Both types of garments performed similarly when tested for strength against tearing the outer shell fabric. The researchers say the PFAS and PFAS-free coatings didn’t seem to affect this attribute.

Ormond said that future work will explore how much oil repellency is needed by firefighters out in the field.
“Even with PFAS treatment, you see a difference between a splash of fluid and soaked-in fluid,” Ormond said. “For all of its benefits, PFAS-treated gear, when soaked, is dangerous to firefighters. So we need to really ask ‘What do firefighters need?’ If you’re not experiencing this need for oil repellency, there’s no worry about switching to non-PFAS gear. But firefighters need to know the non-PFAS gear will absorb oil, regardless of what those oils are.”

Andrew Hall, another NC State doctoral student in fiber and polymer science and co-author on the paper, is also testing dermal absorption, or taking the aged outer shell materials and placing them on a skin surrogate for a day or two. Are outer shell chemicals absorbed in the skin surrogate after these admittedly extreme exposure durations?

“Firefighting as a job is classified as a carcinogen but it shouldn’t have to be,” Ormond said. “How do we make better gear for them? How do we come up with better finishes and strategies for them?

“These aren’t just fabrics,” Ormond said. “They are highly engineered pieces of material that aren’t easily replaced.”

The paper appears in the Journal of Industrial Textiles. Funding for the research came from the Federal Emergency Management Agency’s Assistance to Firefighters Grants Program.

Source:

North Carolina State University, Mick Kulikowski

photo: pixabay
20.04.2021

Biomolecules from renewable Raw Materials for the Textile Industry

Water-repellent and more: coating textiles sustainably with chitosan

Textiles can be coated with the biopolymer chitosan and thus made water-repellent by binding hydrophobic molecules. The good thing is that this can also replace toxic and petroleum-based substances that are currently used for textile finishing. In the last few years Fraunhofer IGB and partners in the HydroFichi project have researched how this can be done: A technology has been developed to provide fibers with the desired properties using biotechnological processes and chitosan.

Water-repellent and more: coating textiles sustainably with chitosan

Textiles can be coated with the biopolymer chitosan and thus made water-repellent by binding hydrophobic molecules. The good thing is that this can also replace toxic and petroleum-based substances that are currently used for textile finishing. In the last few years Fraunhofer IGB and partners in the HydroFichi project have researched how this can be done: A technology has been developed to provide fibers with the desired properties using biotechnological processes and chitosan.

The manufacture of textiles is, even nowadays, still largely characterized by the use of chemicals: biotechnological processes, enzymes and renewable raw materials have so far played a subordinate role. For example, at present chiefly perfluorinated chemicals are used when finishing textiles to obtain water- and oil-repellent properties. These are harmful to health and also only degradable to a small degree, which is why they remain in the environment for so long.

The Fraunhofer Institute for Interfacial Engineering and Biotechnology IGB has been researching sustainable biobased alternatives for some time. In the HydroFichi project – short for Hydrophobic Finishing with Chitosan – which was completed at the end of January 2021, researchers at the institute developed a way of producing chitosan from waste streams and using the biopolymer not only as a sizing agent in the processing of yarns, but also for the functionalization of textiles in the finishing process.

Chitosan from waste for environmental protection, medical purposes or textiles
Chitosan is a renewable raw material that is derived from chitin; after cellulose, it is the second most common naturally occurring biopolymer. Sources of the nitrogen-containing polysaccharide can be crab shells from fishing waste, insect skins and shells that result from the production of animal feed, or – as a vegan variant – the cell walls of mushrooms. The structure of the two molecules is very similar; the only difference is an acetyl group, which is removed when it is converted to chitosan. Chitin is insoluble in water and most organic solvents. Chitosan is also not readily soluble; however, the addition of mild acids makes the biopolymer water-soluble and it can therefore be used as a textile auxiliary.

In order to isolate chitosan from a particular waste stream, chitin must first be obtained from the starting materials by means of demineralization and deproteinization and then its derivative chitosan. The properties of chitosan can be individually adapted by choosing the appropriate conditions. The biomolecule produced in this way can be used directly in a wide variety of practical applications – for example as a flocculant in wastewater treatment or as a drug carrier in medicines.

There are also numerous conceivable uses for chitosan in the textile industry. In sizing, for example, the efficiency of the natural substance has proved convincing in pilot scale tests carried out by the German Institutes of Textile and Fiber Research Denkendorf. Here, the effectiveness was shown in the significantly lower roughness of the yarns after weaving textile fabrics. The values achieved with chitosan from insects were comparable to those from commercial crab shells. In the future, this fact will enable completely new possibilities of extraction in line with the bioeconomy.

As a renewable raw material, chitosan replaces fossil chemicals
“Our aim in the HydroFichi project was to provide the textile industry with a raw material for a wide variety of applications that can be obtained from renewable educts, at the same time avoiding chemicals that damage the environment and health,” explains project manager Dr. Achim Weber, deputy head of the innovation field Functional Surfaces and Materials at Fraunhofer IGB. “In addition to simple coating with chitosan, which protects the fibers, we were also able to use the substance as an anchor molecule to create cross-linking points for a wide variety of functional groups and thus to provide textiles with specific properties such as making them water-repellent. Chitosan can therefore function as a matrix material or template at the same time, and this can be done with a wide variety of fiber materials.”

The finishes were evaluated using standardized tests, but also with specially designed test stands and methods. For example, measurements on treated textiles showed contact angles of over 140°. This means that the fabrics are very water-repellent and confirms that the processing of the textiles has been successful. In a next step, the technology developed at the IGB is to be transferred from the laboratory scale to the much larger pilot scale in order to make the sustainable biomolecule ready for market use as quickly as possible, for example in the sports and outdoor sector.

For the first time biotechnological processes in textile finishing
In the project, the IGB scientists and four partners from the textile industry – the German Institutes of Textile and Fiber Research Denkendorf (DITF), J.G. Knopf's Sohn GmbH, Helmbrechts, and Textilchemie Dr. Petry, Reutlingen – were able for the first time to establish biotechnological processes in raw material extraction and finishing that have proven to be compatible with all textile processes. So far, this is a unique selling point in the finishing of textiles. “We have all recognized the great potential of chitosan for efficient hydrophobization and as a functional carrier. And, thanks to the good cooperation, we were able to successfully establish techniques for tailor-made functionalization of textiles,” adds Dr. Thomas Hahn, who conducts research in the innovation field of Industrial Biotechnology at the IGB. “In addition, other fields of application for the biopolymer are very promising. That is why we initiated the follow-up project ExpandChi immediately after HydroFichi, in which together with our partners techniques are to be developed to use biobased chitosan as a functional carrier to replace other synthetic polymers, for example for a special anti-wrinkle or flame-retardant coating. The textile industry is very interested in utilizing such a sustainable biomolecule as quickly as possible.“

The “HydroFichi” project was funded by the German Federal Ministry of Education and Research (BMBF) under promotional reference 031B0341A; the follow-up project “ExpandChi”, which began in February 2021, is funded under promotional reference 031B1047A.

Textildruckerei Heinrich Mayer GmbH, Michael Steidle (c) Textildruckerei Heinrich Mayer GmbH
21.07.2020

„COVID-19 - We could and should have appeared better as noble knights" Michael Steidle, Textildruckerei Heinrich Mayer GmbH

  • Interview with Michael Steidle, Managing Director Textildruckerei Heinrich Mayer GmbH

At least Europe seems to be able to breathe a sigh of relief after weeks of lockdown during the corona pandemic. The textile industry, an industry that has lived globalisation for so many years, is facing the challenge of maintaining its place in the new normal and building on its previous performance as quickly as possible.
Textination talked to three company representatives along the textile chain about personal and operational experiences.

  • Interview with Michael Steidle, Managing Director Textildruckerei Heinrich Mayer GmbH

At least Europe seems to be able to breathe a sigh of relief after weeks of lockdown during the corona pandemic. The textile industry, an industry that has lived globalisation for so many years, is facing the challenge of maintaining its place in the new normal and building on its previous performance as quickly as possible.
Textination talked to three company representatives along the textile chain about personal and operational experiences.

The Interview with Michael Steidle, managing director at the textile printing company Heinrich Mayer GmbH, marks the provisional end of our series that started with Wolfgang Müller, Head of Sales & Services at Mayer & Cie. GmbH & Co. KG and was continued by Andreas Merkel, managing director of Gebr. Otto Baumwollfeinzwirnerei GmbH & Co. KG. The textile printing company Mayer, a family business on the Swabian Alb, is a leader in textile printing, in screen, rouleaux, rotary, sublimation and flock printing and as well as in 3D coating. They are increasingly using these skills in the area of technical textiles.

How have you felt about the corona era to date - as a company and personally?
What would you on no account want to go through again and what might you even consider maintaining on a daily basis?

 The corona time hit us hard. At the beginning of April, sometimes it felt like the lights would go out within the next 24 hours. In numbers there is a drop in sales of 30 percent.
And that's not just the way we are, this crisis has incredibly broader implications. Involved in the word of the Chamber of Commerce I am concerned with many companies in the region. Sectors that would not come to mind spontaneously also feel the effects. This also includes recycling companies. After all, there is also less commercial waste when companies are on short-time work.
At a personal level you can deal with the crisis, hand hygiene, sneeze etiquette, you can learn all of this. But we miss people-to-people contacts. We have a teenage daughter; young people in particular lack the ability to be out and about with their peers.

 
What has the pandemic meant for your company so far?
As I said, the Corona period brought us a significant drop in sales. That means we think twice before spending money. At the beginning of the year we moved to our new, spacious company building. There are still a few small investments to be made. So far, we have put it off until the situation has calmed down again. And so do many. The economic network extremely got out of hand due to the lockdown.
We applied for short-time work, which has been running for three months now. However, you have to see how long that makes sense. Our customers also had a drop in sales, which they first of all have to recover.

 
What adjustments or innovations to your product portfolio have you felt obliged by the pandemic to undertake?
The mask production was a very strong topic in April and May, the phone almost rang continuously. This enabled us to compensate for many orders that were lost otherwise.
We reacted quickly, not only printing masks classically, but also developing coatings for medical face masks and protective clothing. The coatings that we offer are antibacterial and have the lotus effect. This results in the formation of droplets in the aerosols. We have had checked and certified these innovations in an urgent procedure.
We converted our machines ad hoc so that we could apply innovative coatings instead of paint. This was even possible for ready-made masks.
In general, I rate this ability to react quickly as one of our great strengths. We are a small company, so the path from idea to implementation is rather short. If we recognize a trend, an opportunity in our industry, we examine ourselves: Do we have resources that could be used or adapted to offer a solid, marketable solution in a very short time? This refers to know-how, ideas, machines and, for larger projects, also partners. Experience has shown that on the one hand we have the necessary imagination, but on the other hand we also have a fairly realistic view of ourselves. If we can answer the question with “yes”, then we get started without delay. We can evaluate a trial in the evening and continue working on it the next day. There is no need for a meeting with five persons beforehand.
 

What are your views on global supply chains in the future, and will you be drawing consequences for your procurement policy?
We cannot avoid global supply chains; and it will remain this way. In the short term, you may reflect on regional procurement, as far as that is still possible. Many things are simply no longer available and the development over the past 30 years cannot be turned back. Let's take pigment paint: it comes from India and China, otherwise it doesn't exist anymore. Nobody in Europe can keep the prices. And yes, that also means that the production of systemically relevant products can no longer be guaranteed.

          
How do you rate the importance of partnerships within the industry in the future? Does Covid-19 have the potential to promote the creation of new cooperation arrangements in the industry? Or have they already taken shape?
Existing partnerships are important. We must keep the ball rolling: Interrupted projects have to be continued with existing partners.
I think it is important to maintain partnerships at eye level. Sure, now everyone has to see how they can make ends meet. It will be shown, however, who works loyally in the long term and with respect to the business.
Personally, it is important for me to be true to my word. Only a few days ago I spoke to a student, whom we promised her internship and a corresponding payment in February. This young woman can start her internship with us; what paying is concerned, I had to tell her honestly that we have to talk about it again. Fortunately, that was not a problem. It is important to the student that she can complete the required internship at all. This is not so easy since most companies do not accept anyone right now. That is understandable too, but we will need the well-trained people again soon, that’s for sure!

 
What initiatives or approaches for your industry would you welcome for the near future?
I would be very interested in a positive and comprehensive description of what value added is still available in Germany. An initiative that illustrates that the textile industry is an important industry, with many companies that have been family-owned for generations, often with a young, dynamic management and high-quality products. Really nobody has that on his radar. Just today, two designers from a company nearby visited us. They were surprised which services we offer in the field of technical textiles - they were not even aware of it.
The textile industry has played itself down for a long time, that has to stop. Of course, we no longer have added value like the machine building industry. But now, in the corona crisis, it would have been the right time to take advantage of the situation and to initiate much-needed lobbying..


What would you like to see as part of the German textile industry? Do you feel that the status of the German textile industry has changed as a result of the pandemic, especially in respect of public procurement?
No, only at very short notice. Everything was taken during the crisis, the main thing was that the requested product, i.e. masks and protective clothing, was even available. Now the old cycle is back: I have a certain budget, where can I get the most for it? This is frustrating because the willingness to face this challenge was high on the part of the companies.
We also have driven the development and had our coatings for masks certified in an urgent process. Others have switched their entire production at a significant cost to meet demand. Nobody became a millionaire this way.
I think the textile industry could have sold better here. We could and should have appeared better as noble knights. Unfortunately, this was lost in the heat of the battle.

Until now the big issues have been globalisation, sustainability / climate change / environmental protection, digitisation, the labour market situation and so on. Where do they stand now and how must we rate them against the backdrop of the Covid-19 pandemic?
We take sustainability into account with our certifications, with GOTS and ISO 9001. Digitisation does not work quickly for us; it will take years before we can digitise processes. Sure, in administration we are now increasingly working with web meetings and video conferences, but personal contact is important to me. I regularly give lectures; my next one will be at the Zurich University of Applied Sciences and I very much hope that it can take place. I am just a guy for direct contact.
The labour market situation depends on the pandemic and how it develops. In any case, it remains difficult to get young people excited about textile professions. When I open a mobile phone store, I don't need a day to have my employees together. When we present ourselves at a training fair, we are happy to have a handful of good conversations.
Training is so valuable. Someone who has one will always have a different status than an unskilled person, even if - at some point - he works in a completely different branch. The dual training system is absolutely untouchable for me, because we live from this economic performance. We have nothing else but our knowledge. And we have to keep developing because only the high level gives the necessary output.
 

What lessons are to be learnt in respect of these targets for the post-corona era?
Innovation, innovation, innovation. You must not stand still. Nobody knows what to do next. But in three years from now I have to live from what I am developing today, just like I live from what I developed three years ago. Now, in times of Corona, it is much harder to remember, but it does not help: I can’t stand still, waiting for what is happening next, being like a deer caught in the headlights.

This interview was conducted by Ines Chucholowius, CEO Textination GmbH