External thickness control and method

G - Physics – 01 – B

Patent

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G01B 21/08 (2006.01) B29C 47/88 (2006.01) B29C 47/92 (2006.01)

Patent

CA 2440638

A plastic resin extrusion line for the production of blown film includes an external thickness control device that provides a controllable amount of air from an inlet side through an annular region to one or two sets of lips. Barriers that can be manually or automatically controlled are provided in the annular region for localized control of air flow and thus for localized thickness control. The pressure drop across the barriers is significant relative to that in the lips.

L'invention concerne une ligne d'extrusion de résine plastique permettant de produire un film soufflé. Cette ligne comporte un appareil de contrôle de l'épaisseur externe qui fournit une quantité d'air contrôlable provenant d'un côté d'arrivée par une zone annulaire vers un ou deux jeu(x) de lèvres. Des barrières pouvant être commandées manuellement ou automatiquement se trouvent dans la zone annulaire afin de contrôler localement le flux d'air et de contrôler, en conséquence, l'épaisseur localisée. La baisse de pression au niveau des barrières est importante par rapport à celle constatée au niveau des lèvres.

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