A gearwheel pair for a gear unit, comprising a first gear and a second gear, which can be meshed with one another, wherein the first gear consists entirely or partially of metal or plastic and the second spur gear comprises an outer part having a gear rim made of a first plastic and having a number of injection-molded portions, an inlay part made of metal, and a connecting part, which is arranged between the inlay part and the outer part and is made of a second plastic for the interlocked and/or materially-bonded connection of the inlay part and the outer part and further relates to the second spur gear per se, a gear unit having such a gearwheel pair, and a method for producing a second gear, which is used for such a gear unit.

An Injection molding apparatus injection molding apparatus (10a) comprising: one or more first downstream channels (166, 166a, 166b) and associated first gates (34, 34a, 34b) that deliver injection fluid (18) to a first cavity (300a) of a mold system (302, 303) and to one or more second downstream channels (168, 168a, 168b) and associated second gates (32, 32a, 32b) that deliver injection fluid to a second cavity (300b) of the mold system (302, 303), the mold system being clamped together under a selected force, the apparatus including a first upstream valve (118) that enables and disables flow of the injection fluid to the first gates (34, 34a, 34b) and a second upstream valve (108) that enables and disables flow of the injection fluid to the one or more second gates (32, 32a, 32b), the apparatus including a control system (20) adapted to open or enable flow of the injection fluid (18) to the one or more first gates (34, 34a, 34b) at a first selected time and to further instruct the second upstream valve (108) to open or enable flow of the injection fluid (18) to the one or more second gates (32, 32a, 32b) at a second selected time that is delayed relative to the first selected time during the course of an injection cycle.

Improved injection molding methods and molds, for forming TPU layers, especially thin TPU covers, into golf ball constructions, and having improved number, shape and placement of both the injection gates and the cold slugs within the mold in order to minimize/eliminate damage to dimples strategically positioned close to the parting line of a mold in order to maximize aerodynamic properties of the resulting golf ball.

The present invention is directed to a golf ball having a non-planar parting line on its spherical surface.

The resin injection gate is disposed at the pillar part. When the bearing cage is divided into first and second regions by an imaginary line connecting the resin injection gate and a weld to be formed at a position radially facing the resin injection gate, a resin reservoir that can store therein the melted resin is formed at the pillar part in only one of the regions. A circumferential distance between the resin reservoir and the weld is smaller than a circumferential distance between the resin reservoir and the resin injection gate. A cross-sectional area of a communicating part of the resin reservoir, which is configured to communicate with the pillar part, is equal to or less than a quarter of a cross-sectional area of the resin injection gate.

A system and process for injection molding polymer articles is described. The system and process are designed to reduce gate blush. In one embodiment, an injection molding device injects a molten polymer composition into a mold cavity adjacent to an interior curved surface on the mold. The flow of the polymer material is parallel to a line that is tangent to the curved surface.

An injection molding device and related method includes a mold plate with at least one pocket having at least one discharge opening to discharge melted plastic from the pocket into at least one mold cavity interconnected to the pocket and a nozzle including a housing, which during operation is interconnected to the pocket. Per discharge opening a needle is arranged displaceable in an axial direction in the housing between a closed position and an open position. In the closed position the needle closes the thereto related discharge opening and is thereby preventing melted plastic from flowing from the pocket into the at least one mold cavity. In the open position, the needle releases the discharge opening such that melted plastic flows from the pocket into the at least one mold cavity. Furthermore, a melt channel is discharging into the pocket to supply melted plastic into the pocket.

An injection molding device includes a stationary mold provided with a first gate opening, and a second gate opening, a movable mold configured to be mold-clamped against the stationary mold, a first hot runner configured to inject a first molding material in a cavity compartmented by the stationary mold and the movable mold, via the first gate opening, a second hot runner configured to inject a second molding material in the cavity via the second gate opening, and a cooler configured to cool the stationary mold. An end surface of the stationary mold opposed to the movable mold has a first region located between the first gate opening and the second gate opening, and a second region different from the first region. The cooler is configured so that a cooling performance with respect to the first region becomes higher than a cooling performance with respect to the second region.

An angle gating injection molding apparatus is disclosed. The apparatus includes a gate axis misaligned with a cone axis of a nozzle tip.

An apparatus and method for eliminating mold lines when molding a part having ferromagnetic pigments is provided. A mold assembly having a mold with a cavity and valve gates is formed. Pucks are fitted at the gates to collect residual cold plastic. The calculation of a specific sequence and timing of the opening of the valve gates is determined based on a calculation of the total number of valve gates needed to fill a part while maintaining acceptable injection molding pressure. Once calculated, the gates are positioned around the mold cavity to balance flow length ratio. A primary gate is chosen for initial injection. The time for the material to flow from the first to the second gate is established. The second gate is opened after the flow front reaches the second gate. This pattern continues until all valve gates are opened.