Process and device for recycling blown plastics

Details Process and device for recycling blown plastics Process and device for recycling blown plastics

B - Operations, Transporting

29

B

B29B 17/00 (2006.01) B29B 17/02 (2006.01) C08J 11/02 (2006.01)

Patent

CA 2134648

In a process for recycling blown plastics, the plastic is first ground, melted, and then is degassed and filtered. The degassed plastic is re-blown in the same plant before it has solidified, and, in order to make the degree of blowing uniform, the quantity of gas introduced into the plastic is controlled in relation to the quantity of plastic taken to the blowing plant per unit time, and the pressure of the plastic taken to the blowing plant is preferably kept as constant as possible. The device for implementing this process has an extruder to plasticize and degas the plastic, the outlet of which is connected via at least one line to a mixer to which a gas supply device is also connected. In the line there is a melt pump for the plastic, the flow rate of which is used as a guiding factor for the gas supply. The gas supply is provided via a device which is controlled by a control device in proportion to the running speed of the melt pump.

L'invention concerne un processus de recyclage du plastique soufflé. Premièrement, le plastique est moulu, fondu, puis dégazé et filtré. Le plastique dégazé est ensuite resoufflé dans la même installation avant qu'il ne se solidifie. Pour uniformiser le degré de soufflage, la quantité de gaz introduit dans le plastique est contrôlée selon la quantité de plastique acheminé à l'installation de soufflage par unité temps, et, de préférence, la pression de ce dernier est maintenue aussi constante que possible. Le dispositif de mise en oeuvre de ce processus comporte une extrudeuse de plastification et de dégazage du plastique dont la sortie est reliée, par le biais d'au moins une ligne, à un mélangeur auquel est également relié un dispositif d'alimentation en gaz. Le débit d'écoulement d'une pompe à fondre le plastique, placée dans la ligne, sert de facteur guide pour l'alimentation en gaz qui est obtenue au moyen d'un dispositif commandé par un appareil de commande en proportion avec le régime de fonctionnement de la pompe à fondre.

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