Method for spraying of three-layer sprayed articles

Details Method for spraying of three-layer sprayed articles Method for spraying of three-layer sprayed articles

B - Operations, Transporting

29

C

B29C 45/16 (2006.01) B29C 45/27 (2006.01) B29C 45/28 (2006.01) B29C 45/34 (2006.01)

Patent

CA 2192611

A method of injection molding three-layer moldings, especially bottle blanks with an inner and an outer layer of polyethylene terephthalate and a middle layer of recycled polyethylene terephthalate, employing a mold with several cavities. The material (component A) for the inner and outer layers is supplied through one molten-component conveying channel and the material (component B) for the middle layer through another molten-component conveying channel. The channels are separately heated and their temperatures independently regulated. The melt for component A flows the same distance as the melt for component B. The melts flow into the injection-molding dies such as to ensure a uniform front.

Méthode de moulage par injection de moules à trois couches, surtout des ébauches de bouteille avec une couche interne et externe en téréphtalate de polyéthylène et une couche intermédiaire de téréphtalate de polyéthylène recyclé, à l'aide d'un moule à plusieurs cavités. La matière (composant A) pour les couches interne et externe est fournie par un canal d'alimentation de composant fondu et la matière (composant B) pour la couche intermédiaire par un autre canal d'alimentation de composant fondu. Les canaux sont chauffés séparément et leur température est régulée indépendamment. Le composant A fondu franchit la même distance que le composant B fondu. Les composants fondus s'écoulent dans la filière de moulage par injection de manière à assurer un front uniforme.

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