Fantastic fibres

​Pulpwood is the most important raw material for cellulose, a highly adaptable natural polymer, which may well play a crucial part in building a sustainable future.

TEXT: TIMO NYKÄNEN, PHOTO: JUSSI SÄRKILAHTI

"Cellulose is by far the most abundant organic raw material on earth, and has the potential to become a super-material of the future", says Professor Herbert Sixta, Head of the Department of Forest Products Technology and leader of the Biorefineries Research Group at Aalto University in Espoo, Finland.
Sixta stresses how our oil-based economy and its products must gradually be replaced with the bioeconomy and renewable raw materials in order for us to survive. This fact is the driving force behind Aalto University's ongoing research efforts to optimize and develop processes for separating value-added products such as cellulose, hemicellulose and lignin from biomass. Cellulose is well suited for modification and multiple uses for the good of mankind, even though Sixta admits that the material has certain challenging characteristics.

"The difficult thing with cellulose compared to synthetic polymers is that it is extremely difficult to process. It is a multifunctional polymer with good basic properties, but with limited solubility. Because of this fact, it is quite understandable that so far we only have pulp and paper as larger volume products. We already have textile fibres, and a few other cellulose derivatives such as acetates, but compared to the overall volume of paper they have only niche functions," Sixta says.

He sees the textile industry as a highly potential and significant business for adopting cellulose fibres as replacements for synthetics.

"Textiles have a high market volume of around 100 billion tonnes per year, which is in a similar order of magnitude to paper. At the same time the use of cotton cannot be further increased due to the fact that it competes with arable land needed for the cultivation of food. These conditions are in favor of, for instance, wood-based cellulose products," Sixta explains.


 


 

Pioneering pulp expertise

A Professor at Aalto University since 2007, Sixta also holds an additional post in his native country Austria as a Professor in the field of chemical pulping at the University of Technology in Graz. He started out at the University of Innsbruck in Austria studying chemistry, and obtained a PhD in 1982. However, most of his early career was spent at Lenzing AG, a company specialized in the production of regenerated cellulose fibres. At Lenzing he established a research department mostly focused on pulp chemistry and technology.

"My academic career re-started in the 90's when I became Associate Professor in Graz. As a scientist and researcher I have mainly been involved in the areas of dissolving pulp, cellulose chemistry and regenerated cellulose products. But I expanded this scope to lignin chemistry and also worked on hemicellulose valorization," Sixta says.

These days his research group consists of 21 PhD students working on a varied range of expert subjects related to bio-based material research.

"Our focus as a department is still on improving pulping processes and the properties of pulp, which continue to be key issues around the world. We have, for instance, recently worked on a joint project on traditional kraft pulping with the Metsä Group where we managed to substantially increase the yield of pulp."

Sixta says he is one of the last few researchers with a similar background to many of the previous experts at Aalto University back in the day when there was no distinction made between the fields of pulping and regenerated cellulose fibres.

"Finland certainly belongs to the pioneering countries in pulping and has made many important inventions, especially in engineering. Aalto University used to also be very well known for the chemical recovery in kraft pulping, but unfortunately this expertise has more or less been lost," Sixta says.

Huge potential in textiles

According to Sixta, one of the milestones in processing cellulose for value-added applications is the discovery of so-called ionic liquids as powerful cellulose solvents. By using ionic liquids it is possible to separate certain fractions of molecules from pulp. Hemicellulose can thus be isolated to produce dissolving pulp from paper-grade pulp. Dissolving pulp can then be spun into textile fibres such as viscose or lyocell, or utilized in non-woven technical or chemical applications.


Market volyme of textile industry: 100 billion tonnes per year


Taking a step further, Aalto University took part in the FuBio Cellulose research programme led by the Finnish Bioeconomy Cluster FIBIC Oy, together with a group of other universities and companies, including Metsä Fibre. In a joint effort with a group from the University of Helsinki, the project resulted in a major breakthrough in the summer of 2013, with the discovery of a new type of ionic liquid. The solvent revealed highly stable spinning conditions, which led to excellent quality fibres.

When a sample scarf was knitted from the fibres produced by the novel Ioncell process and after the Finnish design company Marimekko showed interest in the material, a concrete result was displayed in the form of a dress made from birch fibre, launched in March 2014 at Marimekko's fashion show.

Now that the dissolving and regeneration process has been proven to be stable and simple, the next step is to find a way to recycle the solvent.

"We started later with this part of the process, and while there are certain obstacles, I believe we can tackle them. Basically, we have to be able to recycle close to 100 percent of the solvent. Only then can we seriously consider this process as a candidate to be up scaled. It will take a while, but step by step we are approaching the level where we could be considered an interesting partner for the pulp industry," Sixta says.


 

Research ready for the next level

In many ways the pulp industry is ideally positioned to contribute significantly to the bioeconomy. Although the existing pulp technology has its roots in the 19th century, the industry has excellent potential to continue to make innovative use of its renewable raw material.


In many ways the pulp industry is ideally positioned to contribute significantly to the bioeconomy


According to Sixta, in the case of taking cellulose fibres to the next level in textile production, it all depends on the available resources. Refining bio-based materials is a very resource intensive business.

"We would of course be able to do the academic research, but lack the resources for scaling it up. We would need to produce certain amounts of final products, which would then have to be tested by selected clients for feedback. Also, marketing efforts would need to be launched at the same time."

If it was up to Sixta's group, he believes they could deliver the necessary databases for a pre-study, which could then provide the basis for a managerial board to decide whether to invest in the next level. This would be a pilot plant producing around 1 to 5 tonnes of fibres per day, amounting to a value of roughly 20-30 million euros.

Despite the positive buzz around the bioeconomy and its elevated status as one of the Finnish Government's key projects, the situation regarding the project's funding is currently uncertain.

"We, of course, appreciate the support of forest companies and public funding agencies, but there is a gap in taking things to the next level. This is partly due to the fact that Finnish companies don't have their own strong R&D departments in this field anymore, where our knowledge could be built upon and scaled up."

FIBRES PRODUCED BY THE NOVEL IONCELL PROCESS ARE STRONGER THAN COTTON OR VISCOSE. ​

Multifunctional fibres

Textiles would in any case be Sixta's choice as the top application for cellulose fibres in the future, for several reasons.

"The industry is massive, and market demand is predictable. Also, producing textile fibres simply extends upon the existing process concept, since pulp is already produced, so this would be an additional valorization of the original product."

Sixta says that cellulose fibres could also enter other businesses such as the production of a new type of cellophane, which is more or less fading out because of the environmental problems related to its raw material viscose.

If transferred into a successful business, textile fibres would also open up possibilities for further research.

"The financial backup would also give us the freedom to explore the valorization of hemicellulose and lignin, and develop even further uses for this versatile material," Sixta enthuses.


 

Making effective use of by-products


The goal of the bioeconomy is a low-carbon, energy-efficient society based on the use of renewable natural resources and recyclable materials. Metsä Fibre's new bioproduct mill in Äänekoski in Central Finland, scheduled to be completed during the third quarter of 2017, is a practical implementation of these targets.

The bioproduct mill is a prime example of making the most of the valuable wood raw material. In addition to high-quality pulp, it will produce a broad range of bio-products, such as tall oil, turpentine, product gas, bio-electricity and wood fuel. Potential new products created from production side streams include lignin-derived products, sulphuric acid, novel textile fibres, biocomposites, fertilizers and biogas.

The mill is designed to allow for a broad, diverse range of products manufactured by a unique bioeconomy ecosystem of companies. So far, three companies have been named as Metsä Fibre's potential partners in developing novel bioproduct concepts.

The new bioproduct mill in Äänekoski is a prime example of making the most of the valuable wood raw material

Together with its part-owner Itochu, Metsä Fibre will continue work on developing a new process for manufacturing textile fibres from wood pulp. With FA Forest, Metsä Fibre will study potential uses for ash created in pulp manufacturing as a fertilizer and earth construction material. Metsä Fibre has also explored the development path of using pulp in the production of various composite materials in partnership with Elastopoli.


The bioproduct mill will help Finland achieve its goals in terms of renewable energy by producing 2.4 times as much electricity as it needs. When operational, it will increase the share of renewable energy in Finland by more than two percentage points.


 

Related articles

  • Metsä Fibre Mill Managers presented, Rauma mill

    / Solutions

    A strong quartet

    ​We asked all of Metsä Fibre’s Mill Managers to describe the areas of expertise of their units and their own personal strengths.

    Read More
  • Kaskinen mill's rebranded BCTMP pulp portfolio launched

    / Solutions

    Two new BCTMP brands with improved properties

    ​Metsä Board’s rebranded High Yield Pulp portfolio was officially launched at the start of 2018 through Metsä Fibre’s global sales network. The project was based on extensive customer discussions and the chance to simplify the pulp offering into two well-distinguished products. Botnia High Yield BULK offers high bulk and brightness to mainly printing and writing paper grades. Botnia High Yield TENSILE provides excellent tensile strength and brightness for tissue and speciality papers.

    Read More
  • Sustainable wood supply as cornerstone of circular economy

    / Sustainability

    An efficient circular economy needs a sustainable supply chain

    ​Delivering an increasingly sustainable supply chain represents a fundamental cornerstone of Metsä Group’s forestry operations. Enhancing efficiencies, as well as implementing stricter environmental and ecological measures in sustainable forest management, have a considerable impact on how the group adds to the circular economy.

    Read More
  • Kate Stone

    / Solutions

    Making paper magical

    ​Any printed item can be given a digital soul by adding touch, connectivity and data, says Dr Kate Stone.

    Read More
  • FibreOnline

    Issue 1/2018/ Solutions

    Building 24/7 customer service – together

    ​Based on customer feedback and a user research project, Metsä Fibre has completely revamped their online services. Today, these services have become a holistic tool where customers can find everything they need and even download certifications to pass on to their customers. It’s all in one place – online – easily accessed 24/7 at the push of a button.  

    Read More
  • Paptic

    Issue 1/2018/ Partners

    Replacing plastics

    ​Paptic is a biobased, recyclable and renewable next generation packaging material made of sustainable wood fibre. Developed by a Finnish start-up company of the same name, Paptic is suitable for uses where plastic films have previously been the only alternative.

    Read More
  • Kemi mill

    Issue 1/2018/

    Prefeasibility study launched on renewal of Kemi pulp mill

    ​Metsä Fibre has launched a prefeasibility study on the renewal of its pulp mill in Kemi, with the option of either replacing the current mill or extending its life cycle.

    Read More
  • mill

    Issue 1/2018/ Solutions

    RFID pulp delivery tracking

    ​RFID (Radio Frequency Identification) is an identification technology that enables efficient and reliable real time tracking of pulp deliveries. Every pulp unit leaving a Metsä Fibre mill automatically includes RFID tags that help to ensure deliveries and minimise consignment errors.

    Read More
  • employee

    Issue 1/2018/

    Appointments at Metsä Fibre's mills

    ​New appointments at Metsä Fibre's mills announced.

    Read More
  • Äänekoski

    Issue 1/2018/

    Metsä Spring plans textile fibre production

    ​Metsä Group has established a new innovation company, Metsä Spring Ltd.

    Read More
  • Ismo Nousiainen

    Issue 1/2018/ Voice

    Pursuing excellence

    ​The business environment continually changes, and company operations must accordingly evolve to keep pace. There is always room to improve, and always an imperative to do so. Regeneration and continual improvement are no longer a choice, but a necessity and a condition for surviving in the modern era. 

    Read More
  • Kate Stone

    Issue 1/2018/ Voice

    Print is dead, long live print

    ​Print is the most pervasive human interface: we write on it, read it, wear it, sit on it and even eat from it!

    Read More
  • campfire

    Issue 1/2018/ Sustainability

    On a journey of sustainability

    Common sustainability goals bring industry operators together for a memorable event.

    Read More
  • Song

    Issue 1/2018/ Markets

    Eastern horizons

    ​Introducing Wangqiu Song – Metsä Group’s recently recruited SVP, Asia and China – and his unique perspectives on both the Finnish and Asian pulp businesses. 

    Read More
  • Li Na

    Issue 1/2018/ Partners

    Shared values strengthen cooperation

    ​Li Na, Vice Chairman of the Chinese Sun Paper company, says that Metsä Fibre’s strong brand reputation, core values and product quality form the basis of a solid partnership.

    Read More
  • Äänekoski

    / Sustainability

    Key Customer Event showcases sustainable forest management

    ​Running through May 23-25, Metsä Fibre organised a Key Customer Event in and around Äänekoski, the site of its new bioproduct mill, inviting international clients to Central Finland.

    Read More
  • technology

    Issue 1/2018/ Voice

    A digital revolution

    ​Technological trends arising from digitalisation, such as IoT, artificial intelligence and data analytics, are having a major impact on society, the world of work and the business operations of Metsä Fibre.

    Read More
  • Issue 1/2018/ Sustainability

    New combination certificate covers all Metsä Fibre operations

    ​Metsä Fibre’s aim of continuously improving its operations is supported by certified control and management systems, related to quality, the environment, energy efficiency and safety. The systems enable, for example, tracking the origin of the wood raw material and following the logistics chain.

    Read More
  • old Äänekoski mill

    Issue 2/2017/ Sustainability

    Recycling the old Äänekoski mill

    ​The start of operations at the new Metsä Fibre bioproduct mill in Äänekoski has meant shutting down the old pulp mill, and its demolition is currently under way. This work began in June by dismantling the old wastewater treatment plant.

    Read More
  • Woman using a tablet

    Issue 2/2017/

    Customer satisfaction high at Metsä Fibre

    The annual Metsä Fibre customer satisfaction survey was completed again this summer with interviews of pulp customers in various market areas. The overall customer satisfaction rating remained almost unchanged at 8.61 on a scale from 4 to 10.

    Read More
  • Bioproduct mill

    Issue 2/2017/ Sustainability

    World-class bioproduct mill

    ​Metsä Fibre’s next-generation bioproduct mill in Äänekoski, Finland, is the largest wood processing plant in the Northern Hemisphere, which brings prosperity to the whole of Finland. The new mill is called a bioproduct mill since it increases the product portfolio with new bioproducts, generates excess bioenergy, and operates without any fossil fuels. The pulp production capacity of the mill is 1.3 million tonnes of pulp a year.

    Read More
  • Inauguration

    Issue 2/2017/

    Bioproduct mill inaugurated

    ​Metsä Fibre’s next-generation bioproduct mill in Äänekoski, Finland, was inaugurated by the President of Finland Sauli Niinistö on 18 October 2017. Hosted by President and CEO of Metsä Group Kari Jordan, guests at the event included national policy-makers, representatives from the City of Äänekoski and various partners in cooperation related to the bioproduct mill project.

    Read More
  • SkinCare 2.0

    Issue 2/2017/ Partners

    Innovative products from cellulose fibre: GreenDoer

    ​Based in China, Metsä Fibre’s partner company GreenDoer is a leading supplier of next-generation sustainable packaging solutions to the consumer industry. With over 20 years of experience in the industry, the company has developed innovative 3D shaping technology for producing molded fibre products.

    Read More
  • Forest

    Issue 2/2017/ Markets

    Europe's forest nation

    ​Charting the past, present and future of Finland’s uniquely productive relationship with the forest. From Metsä Fibre's perspective, the sustainable and well-organised forest management in Finland and the growing demand from Asia make the future look bright.

    Read More

Most popular

  • Markku Nikkilä

    Issue 2/2017/ Voice

    Sustainable growth from biocomposites

    The abundant annually regenerating forests of Finland place the country in pole position for promoting a bioeconomy based on the sustainable use of renewable natural resources. One example of a solution that reduces the need for fossil oil and polymers is an innovative biocomposite material developed by the Finnish companies Aqvacomp Oy and Elastopoli Ltd.

    Read More
  • confectionary packaging

    Issue 2/2017/ Partners

    Perspectives on product safety

    ​Experts on product safety from throughout Metsä Group – as well as customer organisation CP Kelco – share their views on this crucial area.

    Read More
  • Ahlstrom Munksjo

    Issue 2/2017/ Partners

    The joy of segmentation

    What’s at the heart of a hundred-year success story? Two successful companies, Metsä Group and Ahlstrom-Munksjö, with deep roots and an intense passion for customer satisfaction.

    Read More
  • Winter forest

    Issue 2/2017/ Sustainability

    Boosting the bioeconomy

    CEPI Director General Sylvain Lhôte says that the forest industry has an unbeatable sustainability story to tell, but should be better in communicating its strengths.

    Read More
  • SkinCare 2.0

    Issue 2/2017/ Partners

    Innovative products from cellulose fibre: GreenDoer

    ​Based in China, Metsä Fibre’s partner company GreenDoer is a leading supplier of next-generation sustainable packaging solutions to the consumer industry. With over 20 years of experience in the industry, the company has developed innovative 3D shaping technology for producing molded fibre products.

    Read More
  • Christmas star

    /

    Something old, something new

    ​From 1996, it has been a tradition to have a Christmas star shining over our Äänekoski mill. Set up on top of the digester, the star used to be a landmark of the old mill, wishing Merry Christmas while bringing light to the mill area.

    Read More
  • Forest

    Issue 2/2017/ Markets

    Europe's forest nation

    ​Charting the past, present and future of Finland’s uniquely productive relationship with the forest. From Metsä Fibre's perspective, the sustainable and well-organised forest management in Finland and the growing demand from Asia make the future look bright.

    Read More
  • Inauguration

    Issue 2/2017/

    Bioproduct mill inaugurated

    ​Metsä Fibre’s next-generation bioproduct mill in Äänekoski, Finland, was inaugurated by the President of Finland Sauli Niinistö on 18 October 2017. Hosted by President and CEO of Metsä Group Kari Jordan, guests at the event included national policy-makers, representatives from the City of Äänekoski and various partners in cooperation related to the bioproduct mill project.

    Read More
  • Bioproduct mill

    Issue 2/2017/ Sustainability

    World-class bioproduct mill

    ​Metsä Fibre’s next-generation bioproduct mill in Äänekoski, Finland, is the largest wood processing plant in the Northern Hemisphere, which brings prosperity to the whole of Finland. The new mill is called a bioproduct mill since it increases the product portfolio with new bioproducts, generates excess bioenergy, and operates without any fossil fuels. The pulp production capacity of the mill is 1.3 million tonnes of pulp a year.

    Read More
  • old Äänekoski mill

    Issue 2/2017/ Sustainability

    Recycling the old Äänekoski mill

    ​The start of operations at the new Metsä Fibre bioproduct mill in Äänekoski has meant shutting down the old pulp mill, and its demolition is currently under way. This work began in June by dismantling the old wastewater treatment plant.

    Read More
  • Woman using a tablet

    Issue 2/2017/

    Customer satisfaction high at Metsä Fibre

    The annual Metsä Fibre customer satisfaction survey was completed again this summer with interviews of pulp customers in various market areas. The overall customer satisfaction rating remained almost unchanged at 8.61 on a scale from 4 to 10.

    Read More
  • Issue 1/2018/ Sustainability

    New combination certificate covers all Metsä Fibre operations

    ​Metsä Fibre’s aim of continuously improving its operations is supported by certified control and management systems, related to quality, the environment, energy efficiency and safety. The systems enable, for example, tracking the origin of the wood raw material and following the logistics chain.

    Read More
  • Paptic

    Issue 1/2018/ Partners

    Replacing plastics

    ​Paptic is a biobased, recyclable and renewable next generation packaging material made of sustainable wood fibre. Developed by a Finnish start-up company of the same name, Paptic is suitable for uses where plastic films have previously been the only alternative.

    Read More
  • FibreOnline

    Issue 1/2018/ Solutions

    Building 24/7 customer service – together

    ​Based on customer feedback and a user research project, Metsä Fibre has completely revamped their online services. Today, these services have become a holistic tool where customers can find everything they need and even download certifications to pass on to their customers. It’s all in one place – online – easily accessed 24/7 at the push of a button.  

    Read More
  • Song

    Issue 1/2018/ Markets

    Eastern horizons

    ​Introducing Wangqiu Song – Metsä Group’s recently recruited SVP, Asia and China – and his unique perspectives on both the Finnish and Asian pulp businesses. 

    Read More
  • Ismo Nousiainen

    Issue 1/2018/ Voice

    Pursuing excellence

    ​The business environment continually changes, and company operations must accordingly evolve to keep pace. There is always room to improve, and always an imperative to do so. Regeneration and continual improvement are no longer a choice, but a necessity and a condition for surviving in the modern era. 

    Read More
  • mill

    Issue 1/2018/ Solutions

    RFID pulp delivery tracking

    ​RFID (Radio Frequency Identification) is an identification technology that enables efficient and reliable real time tracking of pulp deliveries. Every pulp unit leaving a Metsä Fibre mill automatically includes RFID tags that help to ensure deliveries and minimise consignment errors.

    Read More
  • technology

    Issue 1/2018/ Voice

    A digital revolution

    ​Technological trends arising from digitalisation, such as IoT, artificial intelligence and data analytics, are having a major impact on society, the world of work and the business operations of Metsä Fibre.

    Read More
  • campfire

    Issue 1/2018/ Sustainability

    On a journey of sustainability

    Common sustainability goals bring industry operators together for a memorable event.

    Read More
  • Äänekoski

    / Sustainability

    Key Customer Event showcases sustainable forest management

    ​Running through May 23-25, Metsä Fibre organised a Key Customer Event in and around Äänekoski, the site of its new bioproduct mill, inviting international clients to Central Finland.

    Read More
  • Kate Stone

    Issue 1/2018/ Voice

    Print is dead, long live print

    ​Print is the most pervasive human interface: we write on it, read it, wear it, sit on it and even eat from it!

    Read More
  • Li Na

    Issue 1/2018/ Partners

    Shared values strengthen cooperation

    ​Li Na, Vice Chairman of the Chinese Sun Paper company, says that Metsä Fibre’s strong brand reputation, core values and product quality form the basis of a solid partnership.

    Read More
  • Äänekoski

    Issue 1/2018/

    Metsä Spring plans textile fibre production

    ​Metsä Group has established a new innovation company, Metsä Spring Ltd.

    Read More
  • employee

    Issue 1/2018/

    Appointments at Metsä Fibre's mills

    ​New appointments at Metsä Fibre's mills announced.

    Read More
  • Kemi mill

    Issue 1/2018/

    Prefeasibility study launched on renewal of Kemi pulp mill

    ​Metsä Fibre has launched a prefeasibility study on the renewal of its pulp mill in Kemi, with the option of either replacing the current mill or extending its life cycle.

    Read More
  • Kate Stone

    / Solutions

    Making paper magical

    ​Any printed item can be given a digital soul by adding touch, connectivity and data, says Dr Kate Stone.

    Read More
  • Sustainable wood supply as cornerstone of circular economy

    / Sustainability

    An efficient circular economy needs a sustainable supply chain

    ​Delivering an increasingly sustainable supply chain represents a fundamental cornerstone of Metsä Group’s forestry operations. Enhancing efficiencies, as well as implementing stricter environmental and ecological measures in sustainable forest management, have a considerable impact on how the group adds to the circular economy.

    Read More
  • Kaskinen mill's rebranded BCTMP pulp portfolio launched

    / Solutions

    Two new BCTMP brands with improved properties

    ​Metsä Board’s rebranded High Yield Pulp portfolio was officially launched at the start of 2018 through Metsä Fibre’s global sales network. The project was based on extensive customer discussions and the chance to simplify the pulp offering into two well-distinguished products. Botnia High Yield BULK offers high bulk and brightness to mainly printing and writing paper grades. Botnia High Yield TENSILE provides excellent tensile strength and brightness for tissue and speciality papers.

    Read More
  • Metsä Fibre Mill Managers presented, Rauma mill

    / Solutions

    A strong quartet

    ​We asked all of Metsä Fibre’s Mill Managers to describe the areas of expertise of their units and their own personal strengths.

    Read More