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AssigneeValtion Teknillinen Tutkimuskeskus
InventorsJanusz Sadowski, Jyrki Salminen, Peter Huber, Camie Heffels, Marian Mours, Klaus Reindel, Jurgen Ettmuller
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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.
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, in which method the polymer in a liquid state flowing past an inspection point is monitored by forming an image, characterised in that at the inspection point, electromagnetic radiation in the form of UV light or polarised electromagnetic radiation is passed through the flow, 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 in the image formed.
Method as claimed in any of the preceding claims, characterised in that the electromagnetic radiation is passed through the flow as a pulse, which is recorded by a detector (8).
Method as claimed in any of the preceding claims, characterized in that the measurement and classification of inhomogeneities is 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 as claimed in any of the preceding claims, characterized in that the inspection point is at the exit end of a polymer melt flow channel, e.g. at a die with at least one of the side walls of the die made of material transparent to the electromagnetic radiation used.
Method as claimed in any of the preceding claims, characterized in that gel particles containing polymers with the same molecular composition as the matrix polymer are detected.
Dependencies are inferred from the claim text.