Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

New pro-environmental technologies for the de-inking of wastepaper

25.08.2004


VTT Technical Research Centre of Finland has developed new technologies for further use of wastepaper in an optimal and environmentally acceptable way. The particular problem in this process was the mixing of digitally printed paper and normal household wastepaper in the collection phase, which deteriorates the de-inking result. The new technologies improve the recyclability of fibres and decrease the amount of unexploitable fibre. These alternative technologies can make the conventional de-inking processes more efficient and even replace them.



The new technologies, high-power ultrasound processing and magnetic separation, enable printing ink to be separated from fibres with lower amounts of chemicals in comparison to current technologies. This environmentally friendly process saves fibres, improves the recyclability of them and decreases the amount of unexploitable fibres, the so-called zero fibres.

Conventional methods, generally flotation and/or washing, are well-suited to the processing of household wastepaper for the time being. However, increased amounts of digitally printed paper in household wastepaper will significantly change the situation in terms of both ink composition and adhesion. In de-inking it is essential that the size of printing ink particles, or the non-uniformity of ink, is correct when de-inking is performed by flotating.


Digitally printed ink detaches in large particles, but high-power ultrasound can be used for splitting ink particles into a size suitable for the process and promoting the detachment of ink from the fibres. On the other hand, several printing ink qualities of office wastepaper contain ferromagnetic, or iron-bearing, components and these are thus easily separated from the de-inked pulp through magnetic separation and lower amounts of chemicals.

Two patent applications have been filed for the technologies developed in the project. The development of pilot-scale equipment is now being continued as part of the factory process, and the objective of this work is a low chemical and energy saving de-inking process for office wastepaper, applying the magnetic separation and ultrasound treatment technology. The analysis methods developed in the project are also well-suited to the quality control of the de-inking process and de-inked pulp.

The high-power ultrasound equipment and magnetic separator will bring distinct quality improvements, particularly in the manufacture of soft tissues. Thanks to these new technologies, it will be possible for equipment manufacturers to launch new products on the market and de-inking plants will be able to improve their de-inking process according to changing raw materials.

VTT’s co-operation partners in this project have been , TEKES, Metso Paper, Raisio Chemicals (currently CIBA Speciality Chemicals), UPM, MetsaeTissue, Paperinkeraeys, SICPA, PQ Finland, Norem Magnets, Finnsonic, and other players in the forest cluster.

VTT co-ordinates Finnish participation in the EU’s COST E46 project called "Improvements in the Understanding and Use of De-Inking Technology".

Pia Qvintus-Leino | alfa
Further information:
http://www.vtt.fi

More articles from Ecology, The Environment and Conservation:

nachricht A new indicator for marine ecosystem changes: the diatom/dinoflagellate index
21.08.2017 | Leibniz-Institut für Ostseeforschung Warnemünde

nachricht Value from wastewater
16.08.2017 | Hochschule Landshut

All articles from Ecology, The Environment and Conservation >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Fizzy soda water could be key to clean manufacture of flat wonder material: Graphene

Whether you call it effervescent, fizzy, or sparkling, carbonated water is making a comeback as a beverage. Aside from quenching thirst, researchers at the University of Illinois at Urbana-Champaign have discovered a new use for these "bubbly" concoctions that will have major impact on the manufacturer of the world's thinnest, flattest, and one most useful materials -- graphene.

As graphene's popularity grows as an advanced "wonder" material, the speed and quality at which it can be manufactured will be paramount. With that in mind,...

Im Focus: Exotic quantum states made from light: Physicists create optical “wells” for a super-photon

Physicists at the University of Bonn have managed to create optical hollows and more complex patterns into which the light of a Bose-Einstein condensate flows. The creation of such highly low-loss structures for light is a prerequisite for complex light circuits, such as for quantum information processing for a new generation of computers. The researchers are now presenting their results in the journal Nature Photonics.

Light particles (photons) occur as tiny, indivisible portions. Many thousands of these light portions can be merged to form a single super-photon if they are...

Im Focus: Circular RNA linked to brain function

For the first time, scientists have shown that circular RNA is linked to brain function. When a RNA molecule called Cdr1as was deleted from the genome of mice, the animals had problems filtering out unnecessary information – like patients suffering from neuropsychiatric disorders.

While hundreds of circular RNAs (circRNAs) are abundant in mammalian brains, one big question has remained unanswered: What are they actually good for? In the...

Im Focus: RAVAN CubeSat measures Earth's outgoing energy

An experimental small satellite has successfully collected and delivered data on a key measurement for predicting changes in Earth's climate.

The Radiometer Assessment using Vertically Aligned Nanotubes (RAVAN) CubeSat was launched into low-Earth orbit on Nov. 11, 2016, in order to test new...

Im Focus: Scientists shine new light on the “other high temperature superconductor”

A study led by scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg presents evidence of the coexistence of superconductivity and “charge-density-waves” in compounds of the poorly-studied family of bismuthates. This observation opens up new perspectives for a deeper understanding of the phenomenon of high-temperature superconductivity, a topic which is at the core of condensed matter research since more than 30 years. The paper by Nicoletti et al has been published in the PNAS.

Since the beginning of the 20th century, superconductivity had been observed in some metals at temperatures only a few degrees above the absolute zero (minus...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Call for Papers – ICNFT 2018, 5th International Conference on New Forming Technology

16.08.2017 | Event News

Sustainability is the business model of tomorrow

04.08.2017 | Event News

Clash of Realities 2017: Registration now open. International Conference at TH Köln

26.07.2017 | Event News

 
Latest News

Cholesterol-lowering drugs may fight infectious disease

22.08.2017 | Health and Medicine

Meter-sized single-crystal graphene growth becomes possible

22.08.2017 | Materials Sciences

Repairing damaged hearts with self-healing heart cells

22.08.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>