Stiffness-taper tubing and the manufacturing method, and manufacturing apparatus for such tubing

摘要

A stiffness-taper tubing and a manufacturing method and apparatus for such, in which the bonding strength in a transition section between resins having different stiffness is increased, where the length of the transition section is shortened and operability is improved, and where the volume of residual resin when switching resins is reduced as well as the degradation of the quality of residual resin due to heating is suppressed. An apparatus for manufacturing stiffness-taper tubing may include a mandrel having a mixing portion, which is tapered and has projections formed thereon.