Hot runner having reduced valve-stem drool

Details Hot runner having reduced valve-stem drool Hot runner having reduced valve-stem drool

B - Operations, Transporting

29

C

B29C 45/18 (2006.01) B29C 45/23 (2006.01) B29C 45/74 (2006.01)

Patent

CA 2698375

Hot-runner system (100; 200; 300; 400), including: actuator plate (120); valve stem (106) of valve actuator (108); back-up pad (110); manifold bushing (118); gap (116A) located between plate (120) and stem (106); gap (116B) located between pad (110) and stem (106); gap (116C) located between bushing (118) and stem (106); and cooling system (114) to freeze drool (109) made to enter, under pressure, into gap (116A), gap (116B) and gap (116C), so that drool (109) that becomes frozen substantially reduces flow of drool (109) along stem (106) and toward actuator (108) wherein pad (110) includes cold inner surface (126) located proximate to stem (106), surface (126) cooled by system (114), portion of drool (109) becomes frozen once drool (109) touches surface (126), pad (110) defines drool-capturing chamber (112) to receive and to capture drool (109), and once drool (109) is received in chamber (112) touches surface (126), drool (109) solidifies so that drool (109) is prevented from entering gap (116B).

L'invention concerne un système à canal chauffé à obturateur (100; 200; 300; 400), présentant (i) un agencement d'étanchéité de sécurité (117) qui comprend (i) une pluralité d'espaces radiaux (116A; 116B; 116C) associée à une tige de soupape (106) d'un actionneur de soupape (108), et (ii) un système de refroidissement (114) positionné relativement à la pluralité d'espaces radiaux (116A; 116B; 116C). Le système de refroidissement (114) est configuré de manière à geler une coulure (109) amenée à pénétrer, sous pression, dans la pluralité d'espaces radiaux (116A; 116B; 116C), de sorte que le gel de la coulure (109) permet de réduire sensiblement l'écoulement de la coulure (109) le long de la tige de soupape (106) et en direction de l'actionneur de soupape (108).

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