A golf ball comprises two generally hemispherical portions joined together at a parting line and comprising dimples on respective outer surfaces thereof. The parting line comprises a repeating pattern of curved segments alternating with straight segments. The parting line crosses a geometric equator of the golf ball, and wherein the parting line intersects at least one dimple bordering the equator. A mold for producing a golf ball is also described.

A spacer (1) is injection molded by using an injection molding die having resin flow channels that are designed such that a plurality of gates (6) are arranged along the longitudinal direction at a position corresponding to the outer peripheral surface of a side wall part (4) in which a plurality of arc-like peripheral surface parts (2) are connected through a waist part (3). After opening the mold and ejecting the spacer, the spacer is cooled with a runner (7) being connected to the gate (6), and thereafter, the runner (7) is cut off. As a result, when producing a water jacket spacer that is assembled to the inside of the water jacket and controls the flow of cooling water by injection molding, while producing with a high productivity without being affected by design constraints caused by draft angle, deformation in the post-molding cooling step is prevented.

The present invention is directed to a golf ball having a non-planar parting line on its spherical surface. The non-planar parting line includes a plurality of arcuate segments, including at least one elliptical arc segment.

In order to simplify the manufacture of an insert part, which has two web structures, each of which forms a plurality of webs, it is proposed that the insert part is manufactured by a molding process in such a way that the two web structures touch each other in respective contact surfaces, but nevertheless remain separated from each other by a mold parting plane. This has the technical advantage that the respective outer contour of the webs of the respective web structure can be defined exclusively with a respective mold part without an offset of the respective other mold part having a negative effect on the shaping of the webs.

An aerator mixing rod includes a body having a first and second opposite ends and an outer surface extending between the ends. The body defines a longitudinal axis extending through the ends. The aerator mixing rod also includes teeth extending radially outward from the outer surface, with a first row of teeth and a second row of teeth spaced from the first row along the longitudinal axis. A first passageway is formed between adjacent teeth of the first row, and a second passageway is formed between adjacent teeth of the second row. The first passageway is at least partially misaligned with the second passageway in a direction parallel to the longitudinal axis such that the first passageway and the second passageway form a tortuous path for fluid flowing along the outer surface of the body. The aerator mixing rod is formed from an injection-moldable material by an injection molding process.

The present disclosure is directed to a golf ball having a non-planar parting line on its spherical surface. The non-planar parting line is comprised of a plurality of arcuate segments, and at least one of the plurality of arcuate segments is a sinusoidal arcuate segment.

A component of a mold for molding preforms made of thermoplastic material, comprising at least a first part (10) and at least a second part (20) adapted to mold part of the outer surface of a preform, wherein, when the first part (10) and the second part (20) are assembled to each other, at least a first surface (11) of the first part (10) and at least a second surface (21) of the second part (20) face each other and are spaced apart from each other, thus delimiting a passageway for gases or vapors to leave the mold; and wherein at least one of said first surface (11) and said second surface (21) comprises laser-induced periodic surface structures (LIPSSs).

An object of the present invention is to provide a method for manufacturing an injection-molded product of a resin composition containing a P3HA-based resin, capable of performing stable continuous production without generating flash. To achieve the object, provided is a method for manufacturing an injection-molded product by using a mold apparatus for a resin composition containing a P3HA-based resin, the P3HA-based resin being a copolymer containing at least one kind of copolymer of a 3HB unit and another hydroxyalkanoate unit, a parting line that is in contact with a cavity inside a mold included in the mold apparatus having a maximum width of not more than 30 m, a vent portion being provided at a specific position inside the mold, the vent portion having an opening portion with a maximum width of 1 m to 50 m.

This invention has an object to provide a method for manufacturing an injection-molded product of a resin composition containing a P3HA-based resin, the method enabling stable continuous production without generating flash. This object is attained by the method for manufacturing, with use of a mold apparatus, the injection-molded product of the resin composition containing the P3HA-based resin, the method including the step of: before filling a mold with the resin composition by injection, carrying out pressure reduction by reducing a gage pressure inside a cavity of the mold so as to be not more than 0.02 MPa, the mold apparatus including the mold which has a parting line being in contact with the cavity in the mold and having a maximum width which is not more than 50 m when the mold is closed.

Golf ball methods and molds for quickly and efficiently eliminating air/gas from within a mold while better centering a subassembly in the mold during golf ball manufacture and the improved golf balls resulting therefrom.