Coinjection molding of preforms for multi-layer containers

Details Coinjection molding of preforms for multi-layer containers Coinjection molding of preforms for multi-layer containers

B - Operations, Transporting

29

C

B29C 45/16 (2006.01)

Patent

CA 2080915

A multi-cavity injection mold (1), for simultaneously injection molding a plurality of multi-layer articles having a single hot runner manifold system (19) for the sequential supply of first and second molten molding materials to the cavities (3) of the mold with each of the materials being supplied simultaneously to all cavities in equal quantities. The invention also provides a core rod (5) for each cavity in which a concavity is provided, adjacent the entry point of the materials into the cavity, to prevent the first injected material in an injection cycle from being washed from the end of the core rod by the second injection material, a buffer of the first injected material in the neck region of the preform to compensate for variations in temperature of the cavities and material being distributed to different parts of the mold and the use of the first part of the metered quantity of the first to be injected material from the next injection cycle to seal the preform at the end of the injection cycle.

Moule à injection à empreintes multiples (1) utilisé pour le moulage par injection simultanée de plusieurs articles multicouches. Le canal chauffé comprend un seul système collecteur (19) aux fins de la distribution séquentielle des premier et deuxième matériaux en fusion vers les empreintes (3) du moule, chacun des matériaux étant distribué en quantités égales. Chacune des empreintes concaves du moule présente une armature (5), adjacente au point d'entrée des matériaux injectés dans l'empreinte, de manière à éviter, que lors d'un cycle d'injection, le premier matériau injecté ne soit éliminé de l'extrémité de l'armature par le deuxième matériau injecté. Un matériau tampon associé au premier matériau injecté dans le goulot de l'ébauche compense les variations de température des empreintes et du matériau distribué vers différentes zones du moule. La première portion du premier matériau, injecté en quantité mesurée lors du cycle d'injection suivant, scelle l'ébauche à la fin du cycle d'injection.

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