Abstract: An improved apparatus for cutting and shaping a spherical material, including an assembly consisting of a number of rotary polygonal members for forming and closing an opening at their center to pass the material through the opening and cut and shape it. Each of the members has curved sides that abut each other when the members close the opening. The first side has a convex surface, and the second side has a concave surface. Each member is associated with each other such that the tip of each member tracks the convex surface of an adjacent member and when the members close the opening, the convex surface engages the concave surface so that substantially spherical products bearing no uneven flower patterns on their outer cover can be produced without any interruption of the operation of the apparatus caused by powder burning and sticking to the polygonal members.

Abstract: A barrier screw having a feed zone, a compression zone and a metering zone, the screw including a shaft, a main flight provided on the shaft and a subflight provided on the shaft. The subflight is developed on the compression zone and then joins with a rear surface of the main flight prededing the subflight by one pitch at an end portion of the metering zone. The subflight defines a melt channel whsoe depth is substantially constant, so that the mixing function of the screw is improved.

Abstract: An apparatus for high frequency molding plastic material using a mold made of a conventional material for applying this technique, e.g. a silicone elastomer or like material. The mold is kept locked shut while the shaped plastic material is cooling by the effect of a pressure reduction set up inside the mold after the high frequency electric field has been applied.

Abstract: An injection mold for producing a two-piece golf ball includes first and second cavities having mating hemispherical inner surfaces with retractable pins for supporting a solid core within the cavities spaced from the inner hemispherical surface. A runner system is provided in the mold for distributing flowable plastic material. A plurality of tunnel gates substantially equally spaced about the perimeter in one of the sections interconnect the inner hemispherical surfaces to the runner system with the tunnel gates being vertically offset from the parting line surface of the two sections. The pins support the solid core in its premolding condition such that the center of the core is slightly offset from the centerline of the mold in the direction of the inner hemispherical surface of the cavity containing the tunnel gates.