Injection head for a corrugator for the production of...

B - Operations – Transporting – 29 – C

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Details

B29C 47/12 (2006.01) B29C 49/00 (2006.01)

Patent

CA 2660471

An injection head (10) is described for a corrugator which is intended for the production of plastics pipes. The injection head (10) has a main head (12), a nozzle body (14) and a die ring device (16) with at least one die ring (32, 36). The main head (12) has been designed with first channels (50, 52) and the nozzle body (14) has been designed with second channels (58, 60), these having flow connection to the first channels (50, 52). The/each die ring (32, 36) has a central body (74, 76) and, surrounding this, a sleeve body (78, 80). The central body (74, 76) has been designed, on its lateral surface (82, 84) facing towards the sleeve body (78, 80), with wound plastics distributor grooves (86, 88) connected by means of connecting sections (114, 120) to a concentric annular groove (112, 116) which has been designed on the reverse surface (90, 92) of the central body (74, 76), and to which the two channels (58, 60) of the nozzle body (14) lead.

L'invention concerne une tête d'injection (10) pour une machine à onduler qui est prévue pour la fabrication de tubes en matière plastique. La tête d'injection (10) présente une tête de base (12), un corps de filière (14) et un ensemble d'embout (16) avec au moins un embout (32, 36). La tête de base (12) est réalisée avec des premiers canaux (50, 52) et le corps de filière (14) avec des deuxièmes canaux (58, 60) qui sont fluidiquement reliés aux premiers canaux (50, 52). L'embout ou chaque embout (32, 36) présente un corps central (74, 76) et un corps de manchon (78, 80) entourant le corps central. Le corps central (74, 76) est réalisé, sur sa surface extérieure (82, 84) tournée vers le corps de manchon (78, 80), avec des rainures distributrices spiralées (86, 88) en matière plastique qui, par des parties de liaison (114, 120), sont fluidiquement reliées à une rainure annulaire concentrique (112, 116) formée sur la surface de dos (90, 92) du corps central (74, 76), rainure dans laquelle débouchent les deuxièmes canaux (58, 60) du corps de filière (14).

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