| 摘要 |
<p>The injection molding of an elongated thin-walled tubular product such as a medical catheter is accomplished through the mounting of an elongated core pin (22) on the interior of an elongated mold cavity (26) wherein tension is continuously applied to the core pin for the purpose of maintaining it in a predetermined, substantially centered relation to the mold cavity and further maintaining a straight line configuration of the core pin along its length. The plastic material from which the product is formed is introduced into the mold cavity while at the same time overcoming any imbalance in the low of the plastic melt into the mold cavity and as it travels in surrounding relation to the core pin and along its length by adjusting the position of the core pin relative to the inner surface of the mold cavity.</p> |
