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AssigneeValtion Teknillinen Tutkimuskeskus
InventorsJanusz Sadowski, Jyrki Salminen, Peter Huber, Camie Heffels, Marian Mours, Klaus Reindel, Jürgen Ettmüller
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In a method for monitoring of polymer in a liquid state, such as a polymer melt or resin, to detect inhomogeneities therein, such as the presence of other phase objects, especially gels in a matrix formed of the liquid state, the polymer in a liquid state flowing past an inspection point is monitored. At the inspection point, electromagnetic radiation in the form of UV light or polarised electromagnetic radiation is passed through the flow chamber (1) and received by a detector (8), and the absorption of the UV light or the changes in the state of polarisation of the electromagnetic radiation caused by the inhomogeneities are used to observe them.
A method for monitoring of polymer in a liquid state to detect inhomogeneities therein, in which method the polymer in a liquid state flowing past an inspection point is monitored by forming an image, wherein at the inspection point, electromagnetic radiation in the form of UV light or polarized electromagnetic radiation is passed through the flow, and the absorption of the UV light or the changes in the state of polarization of the electromagnetic radiation caused by the inhomogeneities are used to observe them in the image formed, the measurement and classification of inhomogeneities being improved by selecting those objects that travel at a predetermined velocity in the flow, avoiding the measurement of unsharp objects due to small focal depth.
A method for monitoring of polymer in a liquid state to detect inhomogeneities therein, in which method the polymer in a liquid state flowing past an inspection point is monitored by forming an image, wherein at the inspection point, electromagnetic radiation in the form of UV light or polarized electromagnetic radiation is passed through the flow, and the absorption of the UV light or the changes in the state of polarization of the electromagnetic radiation caused by the inhomogeneities are used to observe them in the image formed, the flow of the polymer in a liquid state being monitored inside a single-screw or multiple-screw extruder or a continuous kneader, in the transition region between the screw(s) and a die, or inside a die of an extruder or continuous kneader.
A method for monitoring of polymer in a liquid state to detect inhomogeneities therein, in which method a matrix polymer in a liquid state flowing past an inspection point is monitored by forming an image, wherein at the inspection point, electromagnetic radiation in the form of UV light or polarized electromagnetic radiation is passed through the flow, and the absorption of the UV light or the changes in the state of polarization of the electromagnetic radiation caused by the inhomogeneities are used to observe them in the image formed, gel particles containing polymers with the same molecular composition as the matrix polymer being detected in the method.
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