System for the injection moulding of plastic material,...

B - Operations – Transporting – 29 – C

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B29C 45/03 (2006.01) B29C 45/27 (2006.01)

Patent

CA 2721041

An injection moulding system (10; 110; 210) of plastic material, comprising: a press (11; 1 11; 211 ) having a first (11 a) and a second (11 b) pressure plate, suitable for closing between them a mould (13; 113; 213), by applying on it a closing force (F), and a distribution and injection assembly (12; 112; 212), suitable for distributing and injecting a fluid plastic material (MP) into the mould (13; 113; 213) and in turn comprising an intermediate hot distribution plate (23; 123), inter-posed between a bottom plate (21 ) and a nozzle-bearing plate (22), provided for cooperating into contact and in relationship of sliding, along a respective sliding and contact surface (23a), with the end (17a) of one or more injection nozzles (17; 117), fixed on the nozzle-bearing plate (22), in order to distribute the fluid plastic material (MP) to be injected into the mould (13), wherein the distribution and injection assembly (12; 112; 212) is arranged adjacently to and along a side (13c: 113c; 213c), of the mould (13; 113; 213), not associated with the first and the second pressure plate (11 a, 1 1 b), so as not to be subject to the closing force (F) applied by the press (11 ) on the mould, and moreover wherein it (12; 112; 212) is sized (21 a; 121 a) in such way to ensure a perfect sealing against any outflow or leakage toward the outside of the fluid plastic material (MP) which flows, through such sliding and contact surface (23a), from the intermediate hot plate (23) to the injection nozzles (17) for being injected into the mould, despite the distribution and injection assembly (12; 112; 212) is not subject to the action of the closing force (F), applied by the pressure plates (11 a, 1 1 b) of the press (11; 111; 211 ) on the mould (13; 113; 213) during the step of moulding of a piece (P).

L'invention porte sur un système de moulage par injection (10, 110, 210) de matière plastique. Le système comporte une presse (11, 111, 211) munie dune première (11a) et dune seconde (11b) plaques de pression aptes à fermer un moule (13, 113, 213) placé entre elles par application sur lesdites plaques d'une force de fermeture (F). Le système comporte également un ensemble de distribution et d'injection (12, 112, 212) apte à distribuer et à injecter une matière plastique fluide (MP) dans le moule (13, 113, 213). Lensemble de distribution et dinjection (12, 112,212) comporte une plaque de distribution chaude intermédiaire (23, 123) interposée entre une plaque inférieure (21) et une plaque de support de buses (22) pour coopérer en contact et en relation de coulissement, le long d'une surface coulissante et de contact respective (23a), avec l'extrémité (17a) d'une ou de plusieurs buses d'injection (17, 117) fixées sur la plaque de support de buses (22) afin de distribuer la matière plastique fluide (MP) à injecter dans le moule (13). L'ensemble de distribution et d'injection (12, 112, 212) est agencé de façon adjacente et le long d'un côté (13c, 113c, 213c) du moule (13, 113, 213) non associé aux première et seconde plaques de pression (11a, 11b), de façon à ne pas être soumis à la force de fermeture (F) appliquée par la presse (11) sur le moule. Bien que l'ensemble de distribution et d'injection (12, 112, 212) ne soit pas soumis à l'action de la force de fermeture (F) appliquée par les plaques de pression (11a, 11b) de la presse (11, 111, 211) sur le moule (13, 113, 213) durant l'étape de moulage d'une pièce (P), lensemble (12, 112, 212) est dimensionné (21a ; 121a) pour assurer un scellement parfait et prévenir tout débordement ou toute fuite de la matière plastique fluide (MP) qui circule à travers la surface coulissante et de contact (23a) de la plaque chaude intermédiaire (23) aux buses d'injection (17) pour être injectée dans le moule.

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