Molding nozzle gate valve

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 45/23 (2006.01) B29C 45/28 (2006.01) B29C 45/27 (2006.01)

Patent

CA 2460729

A molding nozzle (10) controls the flow of material from a source of plastic melt to an outlet that communicates with a gate (30) to a mold cavity (12). The nozzle (10) contains a valve pin (38) that includes a guide section (40) and a valve end (42), and is movable toward and away from the gate (30) to open and close the gate (30) selectively. The valve pin (38) is guided for movement by guide surfaces (64) on inwardly-extending vanes (62) within the nozzle (10), such that the guide surfaces (64) engage the guide section (40) of the valve pin (38). The valve end (42) of the valve pin (38) has a smaller diameter than that of the guide section (40), so that the valve section (42) is free-floating to allow annular flow in the guide surface region to minimize the likelihood of formation of flow lines in the molded part.

L'invention concerne une buse de moulage (10) qui commande le flux de matière provenant d'une source de plastique fondu vers une sortie qui communique avec une attaque de coulée (30) d'une empreinte du moule (12). La buse (10) comporte une tige de soupape (38) qui comprend une section de guidage (40) et une extrémité de soupape (42), cette tige de soupape pouvant avancer et se séparer de la porte (30) afin d'ouvrir et de fermer l'attaque (30) de manière sélective. La tige de soupape (38) est guidée par des surfaces de guidage (64) situées sur des soupapes s'étendant vers l'intérieur (62) dans la buse (10), de sorte que les surfaces de guidage (64) viennent en contact avec la section de guidage (40) de la tige de soupape (38). L'extrémité de la soupape (42) de la tige de soupape (38) présente un diamètre plus petit que celui de la section de guidage (40), de sorte que la section de soupape (42) à oscillation libre permet l'écoulement annulaire dans la zone de surface de guidage pour minimiser la probabilité de formation de lignes d'écoulement dans la partie moulue.

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