A method produces an injection molded part. A plastic material is injected into a cavity for forming the injection molded part. The plastic material in a flow line region of the cavity, where the plastic material from two directions coincides during an injection molding process, is at least partially removed from the cavity via at least two overflow points and, in so doing, is locally swirled or mixed between the overflow points.

A core mold component defining a lower surface of the injection mold set corresponding to the lower surface of the annular component is heated to a base temperature. A cavity mold component defining the upper surface of the injection mold set corresponding to the Class A surface of the annular component is heated to a higher temperature than the base temperature. Faces of two streams of metallic resin, including the metallic resin flakes, injected into the mold set are caused to come together at the knit line. Metallic resin flakes are caused to flow into inboard and outboard overflow cavity through respective inboard and outboard gates positioned adjacent the knit line.

An injection molding mold 2 where a molten resin containing reinforcing fibers is injected from a gate 11 into a cavity 5 to join the molten resins containing the reinforcing fibers together in the cavity 5 to form a weld portion. The injection molding mold 2 includes a reinforcing fiber orientation change concave portion 20 formed at a position displaced from the weld portion. The reinforcing fiber orientation change concave portion 20 opens to the cavity 5. The reinforcing fiber orientation change concave portion 20 causes the molten resins containing the reinforcing fibers 25 in the cavity 5 to partially flow into the reinforcing fiber orientation change concave portion 20 to disturb directions of the reinforcing fibers at the weld portion. Consequently, the reinforcing fibers at the weld portion and near the weld portion in the cylindrical article 1 tangle, thus improving the strength at the weld portion in the cylindrical article 1.

A method produces an injection molded part. A plastic material is injected into a cavity for forming the injection molded part. The plastic material in a flow line region of the cavity, where the plastic material from two directions coincides during an injection molding process, is at least partially removed from the cavity via at least two overflow points and, in so doing, is locally swirled or mixed between the overflow points.