Injection nozzle for a mould

An injection molding arrangement, comprising:

• a) a mold having a frusto-conical mold hole symmetrical about a longitudinal axis;
• b) an injection nozzle including a body, a sprue extending along the longitudinal axis through the body for conveying a moldable, flowable material from a feedpoint on the body to a sprue gate, said sprue gate being positioned upstream of the mold and the mold hole, and an elongated passage extending through the body along an inclined axis that forms an acute angle of inclination with the longitudinal axis;
• and
• c) valve means including a rod mounted in the passage for movement along the inclined axis, a valve head at a leading end of the rod and having a frusto-conical shape of complementary contour to the mold hole and being symmetrical about a head axis, and drive means for moving the head between an open position remote from the mold hole to permit the material to flow from the sprue gate into the mold hole, and a closed position in which the head projects downstream along the longitudinal axis away from the sprue gate and is seated in, and fully closes, the mold hole to resist material flow into the mold hole, said head axis being generally parallel to the longitudinal axis in the open position and being co-linear with the longitudinal axis in the closed position.