Injection molding machine

An injection molding machine for injection molding a material, said injection molding machine comprising:

• a machine body;
• an injection chamber unit mounted on said machine body;
• a screw barrel mounted on said machine body and extending partially and movably into said injection chamber unit for reciprocating movement therein;
• and
• an extruding screw mounted inside said screw barrel, wherein said injection chamber unit has a horizontal channel for reciprocation of said screw barrel, a vertical channel having an injection nozzle, and a transitioning passage interconnecting said horizontal channel and said vertical channel, said transitioning passage having an innermost turning side and an opposite outermost turning side longer than said innermost turning side, said transitioning passage including at least two. turning corners of obtuse angle at said outermost turning side, one of said turning corners being disposed at the juncture of said horizontal channel and said transitioning passage, the other one of said turning corners being disposed at the juncture of said transitioning passage and said vertical channel, said transitioning passage further including an asymmetric tapered passage section which tapers toward said vertical channel and which has a wall part that partially confines said tapered passage section at said outermost turning side, said wall part having a shape conforming to a segment of a truncated cone-shaped face which complements a wall part of said asymmetric tapered passage section to form said asymmetric tapered passage section.