A method of and device for cooling blown film during the...

B - Operations – Transporting – 29 – C

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B29C 49/64 (2006.01)

Patent

CA 2629990

A method of cooling blown film 14 consisting, of thermoplastic plastics during the production of blown film by means of a blown film extruder 10 with a film blowing head 11 which comprises an annular nozzle 12 from which the blown film 14 emerges and is guided away in an extraction direction, wherein at least two cooling gas flows are made to approach the blown film 14 from the outside in at least two blowing-out planes located at a distance from the annular nozzle, wherein at least one cooling gas flow K G is blown out in the direction opposed to the extraction direction of the blown film (14) and wherein at least one cooling gas flow K A is blown out in the extraction direction of the blown film 14, and wherein, at least one of the cooling gas flows K G, K A can be controlled around their circumference in sectors, at least in respect of its volume flow or temperature.

Méthode de refroidissement de feuilles soufflées (14) consistant en thermoplastiques pendant la production de la feuille soufflée au moyen d'une machine d'extrusion (10) munie d'une tête de soufflage de feuille (11) qui comprend une buse annulaire (12) de laquelle émerge la feuille soufflée (14) qui est extraite de la machine dans une direction, où au moins deux flux de gaz de refroidissement sont constitués pour approcher la feuille soufflée (14) de l'extérieur sur au moins deux plans de soufflage situés à une certaine distance de la buse annulaire; au moins un flux de gaz de refroidissement est soufflé dans la direction opposée à la direction d'extraction de la feuille soufflée (14), et où au moins un flux de gaz de refroidissement (K) est soufflé dans la direction d'extraction de la feuille (14), et où au moins un des flux de gaz de refroidissement (K, G) peut être contrôlé par secteur autour de leur circonférence, du moins par rapport à son débit volumétrique ou à sa température.

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