Apparatus and method for measuring the viscosity of plastic...

G - Physics – 01 – N

Patent

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G01N 11/08 (2006.01) G01N 33/44 (2006.01)

Patent

CA 2348629

The invention relates to a device to be used in a laboratory for measuring the viscosity of plastic materials, especially of molten polymers, according to the principle of determining the drop in pressure when the material is flowing through a capillary having a defined cross-section and a defined length. A device of this type can particularly be used for carrying out continuous measurements during operation, especially in integrated quality control. To this end, a volumetrically controllable molten material pump (13) which is provided for producing a defined flow of molten material is incorporated in a device that can be heated. In order to measure a large range of flow rates, n capillaries (37-39) of different dimensions are incorporated in the device in a fixed manner, whereby n = 2, 3, 4,... The flow of molten material from the pump (13) to each capillary is carried out by a mobile molten material distributor (30) so that two or more capillaries can be charged in succession with molten material by varying the position of the distributor (30), and a pressure measuring sensor (18) and temperature measuring sensor (19) which are matched to the pressure range are connected upstream from each capillary.

L'invention concerne un dispositif destiné à être utilisé en laboratoire pour mesurer la viscosité de matières plastiques, notamment de matières polymères fondues, selon le principe de la détermination de la chute de pression lorsque la matière s'écoule à travers un capillaire présentant une section et une longueur définies. Un tel dispositif peut également être utilisé en particulier pour effectuer des mesures en continu, en usine, notamment dans le cadre d'un contrôle de qualité intégré. Selon l'invention, une pompe à matière fondue (13), à régulation volumétrique, est incorporée dans un dispositif chauffant pour produire un flux de matière fondue défini. Pour mesurer une plus grande plage de vitesses d'écoulement, n capillaires (37-39) de différentes dimensions sont fixés dans le dispositif, n étant égal à 2, 3, 4 .. Le flux de matière fondue de la pompe (13) vers chacun des capillaires est provoqué par un répartiteur mobile de matière fondue (30), de sorte qu'en faisant varier la position de ce répartiteur (30), il est possible d'alimenter successivement au moins deux capillaires en matière fondue. Un capteur de pression (18) et un capteur de température (19) sont montés en amont de chaque capillaire.

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