| 摘要 |
PURPOSE:To intercept the supply of resin quickly and smoothly by a method wherein a movable member, provided in a hot runner, is moved in case a multi- layer forming structure is formed by the co-injection of a plurality of resins. CONSTITUTION:A movable member 6, capable of moving into an axial direction, is arranged coaxially between an inner tubular member 2 and an outer tubular member 3. The movable member is a tubular member as a whole and the outer surface thereof is provided so as to be slidable on the inner surface of the outer tubular member 3 while a small clearance is provided between the inner surface of the movable member 6 and the outer surface of the inner tubular member 2 and a second resin path 7 for controlling an injection timing is formed between them. A truncated conical surface 8 is provided at the side end of the movable member 6 while the conical surface 9 is also provided on the inner tubular member 2. Accordingly, the conical bodies 8, 9 are engaged when the movable member 6 descends, whereby the resin path 7 is intercepted. |
