| 摘要 |
<p>The invention refers to a valve pin bushing for use in an injection molding system. The valve pin bushing includes a body portion, a projecting portion that extends from the body portion and a bore extending through the body portion and the projecting portion to accommodate a valve pin. The projecting portion having an inlet opening in an upstream side thereof and an outlet opening in a downstream end thereof. In combination with the valve pin, the projecting portion defines an annular section of a melt flow channel. An upstream side of the projecting portion includes a flow restrictor disposed in the annular section of the flow channel, wherein the flow restrictor partially defines an outside boundary of the annular section.</p> |
