Nozzle assembly for injection molding apparatus

Details Nozzle assembly for injection molding apparatus Nozzle assembly for injection molding apparatus

B - Operations, Transporting

29

C

B29C 45/20 (2006.01) B29C 45/27 (2006.01) B29C 45/74 (2006.01)

Patent

CA 2280837

A nozzle assembly (10) for use with injection molding apparatus includes an outer sleeve (12) having a relatively large bore extending from an open rearward end forwardly to a substantially closed forward end, and having an injection orifice (22) therein. An inner nozzle tip (14) is located within the sleeve (12), and has a radial flange and an internal bore extending from a rearward opened end to a forward tip having a plurality of flow orifices upstream of the injection orifice. A manifold insert (18) is located within the outer sleeve (12) and includes a through bore in axial alignment with the bore of the nozzle tip (14). The manifold insert (18) has a forward end which receives the nozzle tip (14) and abuts the radial flange. A coil heater (16) is located radially between the manifold and the outer sleeve, a forward end of the coil heater (16) is seated on the radial flange. The manifold insert (18), nozzle tip (14), and coil heater (16) form a subassembly which is easily removed and reinserted vis-a-vis the outer sleeve.

Un ensemble busette (10), destiné à un dispositif de moulage par injection, comprend un manchon externe (12) qui comporte un trou relativement large partant d'une extrémité postérieure ouverte et dirigé vers l'avant vers une extrémité antérieure sensiblement fermée, et un orifice d'injection (22). Un ajutage (14) de busette interne, localisé à l'intérieur du manchon (12), comporte un flasque radial et un trou interne partant d'une extrémité postérieure ouverte et dirigé vers un ajutage antérieur qui présente une pluralité d'orifices d'écoulement en amont de l'orifice d'injection. Une insertion (18) de collecteur, disposée à l'intérieur du manchon externe (12), comporte un trou traversant en alignement axial avec le trou de l'ajutage (14) de la busette. L'insertion (18) du collecteur comporte une extrémité antérieure qui reçoit l'ajutage (14) et bute contre le flasque radial. Un serpentin chauffant (16), disposé radialement entre le collecteur et le manchon externe, présente une extrémité avant reposant sur le flasque. L'insertion (18) du collecteur, l'ajutage (14) de la busette et le serpentin chauffant (16) forment un sous-ensemble qui est facile à enlever et à réinsérer par rapport au manchon externe.

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