Systems and methods for purging process lines of additives...

B - Operations – Transporting – 29 – C

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B29C 31/10 (2006.01) B05B 12/14 (2006.01) B08B 9/02 (2006.01) B29C 47/08 (2006.01)

Patent

CA 2230249

Systems and methods are provided whereby additive for thermoplastic materials may be recovered in a primary additive supply system simultaneously with the supply of an additive from a secondary additive supply system to a molten thermoplastic stream. Each of the primary and secondary additive supply systems is provided with respective recirculation lines so as to prevent sedimentation of the additive. According to the present invention, therefore, a protocol is employed whereby substantially all of the additive in the additive supply system, including that quantity of additive in the recirculation lines, may be recovered so that a fresh supply of additive (which oftentimes is different from the previous additive) may be connected for injection into the molten thermoplastic stream at the appropriate time.

L'invention a trait à des systèmes et à des méthodes grâce auxquels les additifs ajoutés à des matières thermoplastiques peuvent être récupérés dans un système primaire servant à alimenter en additifs un bain de matières thermoplastiques en fusion. La méthode permet de récupérer en même temps les additifs utilisés dans un système secondaire. Chaque système, primaire et secondaire, d'alimentation en additifs est doté de conduits respectifs de recirculation afin d'empêcher la sédimentation des additifs. Par conséquent, l'invention comprend un protocole selon lequel essentiellement tous les additifs se trouvant dans le système d'alimentation en additifs, y compris le volume d'additifs dans les conduits de recirculation, peuvent être récupérés de sorte qu'un approvisionnement frais d'additifs (qui diffère souvent du volume précédent d'additifs) peut être introduit dans le système pour être injecté dans le bain de matières thermoplastiques en fusion à un moment propice.

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