| 摘要 |
PURPOSE:To smoothly replace resin without generating a weld line by forming a passage shallower than a depth of a manifold and deeper than a dam lip in a resin passage between the lip and the manifold. CONSTITUTION:A core bar 16 is inserted into a die housing 12 to form a resin passage 18, and a resin inlet 22 is opened from an extruder side. Long and short manifolds branched from the inlet 22 to a land 30 of the bar 16 circumferentially, reduced in sectional area of the passage and bent in an extruding direction are formed. An end of the short manifold 24a2 is combined from the other resin inlet 22a on the midway of the long manifold 24a1, and a dam lip 28 for forming a shallow passage is formed along a circumferential direction of the bar 16 at the end of the manifold 24a31. A land 30 formed with a passage shallower than the depth of the manifold 24 and deeper than the lip 28 is formed at the entire passage 18 between the lip 24 and the manifold 24. |
