Method of making a molded plastic container

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 49/08 (2006.01) B29C 49/46 (2006.01) B29C 49/48 (2006.01) B29C 49/64 (2006.01) B29C 49/66 (2006.01) B29C 49/06 (2006.01) B29C 49/12 (2006.01) B29C 49/58 (2006.01)

Patent

CA 2191093

A polyethylene terephthalate (PET) preform (11) having a capped cylindrical body (13), a threaded top and collared neck (19) is preheated to soften the PET.The preform (11) is placed in a split mold (26) whose walls are heated to a temperature between 150°C and 177°C. A stretch rod (35), inserted through the top of the preform (11), stretches the preform (11) axially until the preform is the length of the final product (49). The preform (11) is expanded using compressed ambient air, and is molded against the walls (27, 29) of the mold (26). The air is vented, and dry nitrogen at a temperature below -50°C is injected into the molded preform (47) to purge and cool the molded preform (47) while maintaining pressure of at least 520 kPag. The molded preform (47) is held against the mold (36) to anneal the inner and outer surfaces of the molded preform (47). The nitrogen supply is shut off and the final product (49) is released from the mold (26).

On préchauffe une ébauche (11) en polyéthylène terephthalate (PET) possédant un corps cylindrique coiffé (13), une partie supérieure filetée et une collerette (19) afin de ramollir le PET. On place l'ébauche (11) dans un moule fendu (26) dont les parois sont chauffées pour atteindre une température située entre 150 ~C et 177 ~C. Une tige d'étirage (35), introduite à travers la partie supérieure de l'ébauche (11), étire cette dernière (11) axialement jusqu'à ce qu'elle atteigne la longueur du produit final (49). L'ébauche (11) est dilatée au moyen d'air ambiant comprimé et moulée contre les parois (27, 29) du moule (26). On évacue l'air et on injecte de l'azote sec à une température inférieure à -50 ~C dans l'ébauche moulée (47) afin de la purger et de la refroidir, tout en maintenant une pression d'au moins 520 kPag. On maintient l'ébauche moulée (47) contre le moule (36) afin d'effectuer le recuit des surfaces intérieure et extérieure de ladite ébauche moulée (47). On interrompt l'apport d'azote et on ôte du moule (26) le produit fini (49).

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