| 摘要 |
<p>A method of co-extruding a plurality of plastic material flowing streams into a mold cavity produces a molded product. A flow velocity profile (120) at the end of a nozzle (100) having a throttle pin (110) is provided, including a flow velocity profile (160) near the flow front (140) in an article (130) as the flow front (140) moves at an average velocity. The interior core material (170) is injected along a streamline having a flow velocity greater than an average velocity of the combined streams, but less than the maximum velocity at the zero gradient (150), and the interior stream does not flow along or across a zero-velocity-gradient streamline of the combined streams.</p> |
