Material reflow preventing device and a molding apparatus with the same

A material reflow preventing device for melting a solid-state linear material into a fluid-state material and injecting the fluid-state material into a molding unit, said material reflow preventing device comprising:

• a material conduit extending along a longitudinal axis, and including an inlet port for entrance of the solid-state linear material, an outlet port opposite to said inlet port along the longitudinal axis for permitting flow of the fluid-state material out of said material conduit, an inner peripheral surface extending from said inlet port to said outlet port and surrounding the longitudinal axis to define a chamber therein, an outer peripheral surface radially opposite to said inner peripheral surface, a low-temperature conduit section adjacent to and downstream of said inlet port, a first heating conduit section interposed between said low temperature conduit section and said outlet port, a second heating conduit section interposed between said first heating conduit section and said outlet port, and a third heating conduit section interposed between said second heating conduit section and said outlet port, said inner peripheral surface having a spiral groove which extends from said inlet port to said outlet port and which surrounds the longitudinal axis;
• and
• a heating unit disposed outwardly of said material conduit and along the longitudinal axis to heat said material conduit such that a material in said third heating conduit section reaches a temperature larger than that of a material in said second heating conduit section, the temperature of the material in said second heating conduit section is larger than that of a material in said first heating conduit section, and the temperature of the material in said first heating conduit section is larger than that of a material in said low-temperature conduit section.