| 摘要 |
<p>This invention relates to an improved valve pin bushing (42) for a multi-cavity injection molding system. The valve pin bushing has a central bore through which the valve pin (60) extends. The melt duct (120) extends through the bushing (42) to join an enlarged portion (66) of the central bore around the valve pin (60). In the bushing according to the invention, the melt duct (120) branches into two arms (128, 130) with smoothly curved bends which lead to opposite sides of the valve pin (60). This avoids the problem of streaking and slow melt flow on the opposite side of the valve pin.</p> |
