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.
Pia Qvintus-Leino | alfa
How does the loss of species alter ecosystems?
18.05.2017 | Deutsches Zentrum für integrative Biodiversitätsforschung (iDiv) Halle-Jena-Leipzig
Excess diesel emissions bring global health & environmental impacts
16.05.2017 | International Institute for Applied Systems Analysis (IIASA)
An international team of physicists has monitored the scattering behaviour of electrons in a non-conducting material in real-time. Their insights could be beneficial for radiotherapy.
We can refer to electrons in non-conducting materials as ‘sluggish’. Typically, they remain fixed in a location, deep inside an atomic composite. It is hence...
Two-dimensional magnetic structures are regarded as a promising material for new types of data storage, since the magnetic properties of individual molecular building blocks can be investigated and modified. For the first time, researchers have now produced a wafer-thin ferrimagnet, in which molecules with different magnetic centers arrange themselves on a gold surface to form a checkerboard pattern. Scientists at the Swiss Nanoscience Institute at the University of Basel and the Paul Scherrer Institute published their findings in the journal Nature Communications.
Ferrimagnets are composed of two centers which are magnetized at different strengths and point in opposing directions. Two-dimensional, quasi-flat ferrimagnets...
An Australian-Chinese research team has created the world's thinnest hologram, paving the way towards the integration of 3D holography into everyday...
In the race to produce a quantum computer, a number of projects are seeking a way to create quantum bits -- or qubits -- that are stable, meaning they are not much affected by changes in their environment. This normally needs highly nonlinear non-dissipative elements capable of functioning at very low temperatures.
In pursuit of this goal, researchers at EPFL's Laboratory of Photonics and Quantum Measurements LPQM (STI/SB), have investigated a nonlinear graphene-based...
Dental plaque and the viscous brown slime in drainpipes are two familiar examples of bacterial biofilms. Removing such bacterial depositions from surfaces is...
23.05.2017 | Event News
22.05.2017 | Event News
17.05.2017 | Event News
23.05.2017 | Physics and Astronomy
23.05.2017 | Life Sciences
23.05.2017 | Medical Engineering