Adjustable, leak-free sealing device for polymer dies

Details Adjustable, leak-free sealing device for polymer dies Adjustable, leak-free sealing device for polymer dies

B - Operations, Transporting

29

C

B29C 47/16 (2006.01) B29C 47/08 (2006.01)

Patent

CA 2330159

The present invention provides an adjustable, leak-free sealing device (20) for sealing the die orifice (14) of a molten polymer die (10). The sealing device (20) includes a sealing bar (40) seated against and blocking a portion of the die orifice (14), a deckle holder (21) slideably connected to one side of the die (10) and extending under the die orifice (14), and a plurality of springs (45) seated on the deckle holder (21) and biasing the sealing bar (40) against a portion of the die orifice (14). The springs (45) have a combined spring force equal to or greater than the die orifice outlet pressure such that the sealing bar (40) provides a leak-free seal along a portion of the die orifice (14).

L'invention concerne un dispositif (20) de scellement réglable et sans fuites permettant de sceller l'orifice (14) d'une matrice (10) polymère en fusion. Le dispositif (20) de scellement comprend un fer soudeur (40) plaqué contre et bloquant une partie de l'orifice (14) de la matrice, un organe de support (21) d'un système de réglage de la largeur connecté de manière coulissante à un côté de la matrice (10) et s'étendant sous l'orifice (14) de la matrice et une pluralité de ressorts (45) reposant sur l'organe de support (21) du système de réglage de la largeur et sollicitant le fer soudeur (40) contre une partie de l'orifice (14) de la matrice. Les ressorts (45) présentent une force de ressort combinée égale ou supérieure à la pression de sortie de l'orifice de manière que le fer soudeur (40) assure un scellement sans fuites le long de la partie de l'orifice (14).

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