Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:


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


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:

More articles from Ecology, The Environment and Conservation:

nachricht Invasive Insects Cost the World Billions Per Year
04.10.2016 | University of Adelaide

nachricht Malaysia's unique freshwater mussels in danger
27.09.2016 | The University of Nottingham Malaysia Campus

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: New 3-D wiring technique brings scalable quantum computers closer to reality

Researchers from the Institute for Quantum Computing (IQC) at the University of Waterloo led the development of a new extensible wiring technique capable of controlling superconducting quantum bits, representing a significant step towards to the realization of a scalable quantum computer.

"The quantum socket is a wiring method that uses three-dimensional wires based on spring-loaded pins to address individual qubits," said Jeremy Béjanin, a PhD...

Im Focus: Scientists develop a semiconductor nanocomposite material that moves in response to light

In a paper in Scientific Reports, a research team at Worcester Polytechnic Institute describes a novel light-activated phenomenon that could become the basis for applications as diverse as microscopic robotic grippers and more efficient solar cells.

A research team at Worcester Polytechnic Institute (WPI) has developed a revolutionary, light-activated semiconductor nanocomposite material that can be used...

Im Focus: Diamonds aren't forever: Sandia, Harvard team create first quantum computer bridge

By forcefully embedding two silicon atoms in a diamond matrix, Sandia researchers have demonstrated for the first time on a single chip all the components needed to create a quantum bridge to link quantum computers together.

"People have already built small quantum computers," says Sandia researcher Ryan Camacho. "Maybe the first useful one won't be a single giant quantum computer...

Im Focus: New Products - Highlights of COMPAMED 2016

COMPAMED has become the leading international marketplace for suppliers of medical manufacturing. The trade fair, which takes place every November and is co-located to MEDICA in Dusseldorf, has been steadily growing over the past years and shows that medical technology remains a rapidly growing market.

In 2016, the joint pavilion by the IVAM Microtechnology Network, the Product Market “High-tech for Medical Devices”, will be located in Hall 8a again and will...

Im Focus: Ultra-thin ferroelectric material for next-generation electronics

'Ferroelectric' materials can switch between different states of electrical polarization in response to an external electric field. This flexibility means they show promise for many applications, for example in electronic devices and computer memory. Current ferroelectric materials are highly valued for their thermal and chemical stability and rapid electro-mechanical responses, but creating a material that is scalable down to the tiny sizes needed for technologies like silicon-based semiconductors (Si-based CMOS) has proven challenging.

Now, Hiroshi Funakubo and co-workers at the Tokyo Institute of Technology, in collaboration with researchers across Japan, have conducted experiments to...

All Focus news of the innovation-report >>>



Event News

#IC2S2: When Social Science meets Computer Science - GESIS will host the IC2S2 conference 2017

14.10.2016 | Event News

Agricultural Trade Developments and Potentials in Central Asia and the South Caucasus

14.10.2016 | Event News

World Health Summit – Day Three: A Call to Action

12.10.2016 | Event News

Latest News

Resolving the mystery of preeclampsia

21.10.2016 | Health and Medicine

Stanford researchers create new special-purpose computer that may someday save us billions

21.10.2016 | Information Technology

From ancient fossils to future cars

21.10.2016 | Materials Sciences

More VideoLinks >>>