Device for ejecting pet preforms

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 45/43 (2006.01) B29C 45/33 (2006.01)

Patent

CA 2577977

An ejector is used for ejecting PET preforms (6) from an injection moulding tool. The tool comprises a clamping plate (1) to which a mould core (2) is secured. A movable stripping plate (7) is used to move a stripper strip (9), to which are secured threaded slides (10), in the ejection direction A. A yoke support (8) opens the stripper strip (9) by means of a slanted drawing finger (4). Pressurised air L is blown through air channels (11) arranged in the stripper strip (9), into the space between the mould core (2) and the preform (6) to be ejected. For that purpose, the air channels (11) are inclined to a predetermined extent relative to the ejection direction A. This ensures that even particularly large preforms (6) can be securely ejected from the tool.

L'invention concerne un dispositif éjecteur servant à éjecter des ébauches en PET (6) d'un moule à injection. Ce moule présente un plateau de fixation (1) sur lequel est fixé un coeur de moule (2). Une plaque de dévêtissage mobile (7) sert à déplacer, dans le sens d'éjection A, une barre à coulisse (9) à laquelle sont fixés des coulisseaux filetés (10). Un support de châssis (8) ouvre la barre à coulisse (9) à l'aide d'un doigt de traction oblique (4). De l'air comprimé L est soufflé entre le coeur de moule (2) et l'ébauche à éjecter (6) par des conduits d'air (11) situés dans la barre à coulisse (9). A cet effet, les conduits d'air (11) présentent une inclinaison prédéfinie en direction du sens d'éjection A. Cela permet de garantir que même des ébauches particulièrement longues (6) seront éjectées de manière fiable du moule.

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