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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Grönroos, Antti
VTT Technical Research Centre of Finland
in Cooperation with on an Cooperation-Score of 37%
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Publications (7/7 displayed)
- 2022Pilot-scale modification of polyethersulfone membrane with a size and charge selective nanocellulose layercitations
- 2021Membrane-based conceptual design of reuse water production from candy factory wastewatercitations
- 2010Ultrasonically Enhanced Disintegration. Polymers, Sludge, and Contaminated Soil
- 2009New processing technique for viscous amorphous materials and characterisation of their stickiness and deformabilitycitations
- 2004Ultrasonic depolymerization of aqueous carboxymethylcellulosecitations
- 2001Research for efficient separation
- 2001Ultrasonic depolymerization of aqueous polyvinyl alcoholcitations
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article
New processing technique for viscous amorphous materials and characterisation of their stickiness and deformability
Abstract
This paper reports on a technique using ultrasound-assisted equipment tocharacterise and handle stickiness of viscous amorphous blends ofcitric acid and paracetamol after melt mixing and during processing.Deformability and stickiness were studied using a specially designedsample measurement compartment. An ultrasound-assisted nozzle and knifefor pharmaceutical applications were studied. The application ofultrasound was found to increase the mass flow through a nozzleconnected to a pressurized tank. This effect was found to be separatefrom the increased mass transport resulting from the reduced viscosityas the temperature was increased. Ultrasound was also found to have afavourable influence on cutting through melt extrudates. The stickinessand resistance to deformation of samples were observed to be dependenton the amount of paracetamol in the blend and temperature that was inagreement with the glass transition temperature and viscosity. Otherinfluencing factors, such as time-dependent wetting and surfaceenergetics, are discussed. We conclude that it is possible tocharacterise stickiness and resistance to deformation of viscousamorphous materials with a specially designed probe test, and thestickiness of amorphous material can be handled during processing withultrasound-assisted equipment.