Method for increasing thermal convection speed in a...

B - Operations – Transporting – 29 – B

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B29B 13/02 (2006.01) B29C 35/02 (2006.01) B29C 35/08 (2006.01)

Patent

CA 2341600

The invention concerns a method for increasing thermal convection speed in a thermofusible polymer, in particular a polyethylene terephthalate, enabling to increase the speed of heat transmission by thermal convection in said polymer, by exposing it simultaneously to at least a thermal radiation source and ultrasonic vibrations. The ultrasonic vibrations are preferably applied intermittently on a surface of the polymer by means of a sonotrode supplied by an ultrasound generator, either directly, or via a liquid in contact with the polymer. Thus the physical characteristics of the polymer can be improved and the heat transmission speed can be varied depending on its form, mass and type.

Le procédé pour augmenter la vitesse de convection thermique dans un polymère thermofusible, notamment un polyéthylène téréphtalate, permet d'augmenter la vitesse de transmission de la chaleur par convection thermique dans ce polymère, en l'exposant simultanément à au moins une source de rayonnement thermique et à des vibrations ultrasoniques. Les vibrations ultrasoniques sont appliquées de préférence par intermittence sur une surface du polymère au moyen d'une sonotrode alimentée par un générateur d'ultrasons, soit directement, soit par l'intermédiaire d'un liquide en contact avec le polymère. On peut ainsi améliorer les caractéristiques physiques du polymère et faire varier la vitesse de transmission de la chaleur en fonction de sa forme, de sa masse et de sa nature.

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