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 resin reservoir capable of storing the melted resin is provided in the pillar radially facing the pillar provided with the resin injection gate having a cross-sectional area larger than those of the other resin injection gates among a plurality of the pillars not provided with the resin injection gate or the pillar in the vicinity of the pillar facing the pillar provided with the resin injection gate having a cross-sectional area larger than those of the other resin injection gates among the plurality of the pillars not provided with the resin injection gate. A cross-sectional area of a communicating portion of the resin reservoir which communicates with the pillar is smaller than the smallest of cross-sectional areas of a plurality of the resin injection gates.

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.

An extruder has a barrel extending from a feed inlet end to an extruder outlet end. The barrel has an inner surface, an outer surface, and a wall thickness between the inner and outer surfaces. The extruder also has at least one heating member positioned provided on the barrel; a screw drive motor drivingly connected to a rotatably mounted screw positioned within the barrel, whereby the screw is rotatable at various revolutions per minute (RPM); and a controller is operably connected to the screw drive motor to adjust the RPM of the screw based upon a temperature of material passing through and/or being extruded from the barrel. Methods for operating an extruder filling a mold are also provided.

A method for producing a cable with a resin mold including a cable section comprising an electric wire and a sheath comprising a synthetic resin covering the electric wire, and a resin mold section into which a portion of the sheath is molded by a resin is provided. A portion of the cable section is received in a receiving space in a die formed with a molten resin inlet, an inflow passage, and a resin reservoir therein. A molten resin is injected from the inlet into the receiving space. A portion of the injected molten resin flows through the inflow passage and is retained in the resin reservoir. The portion of the sheath is molten by heat of the molten resin. The molten resin is solidified to thereby form a molded resin product. Its unnecessary portion solidified in the resin reservoir is removed from the molded resin product.

Provided is a method of polymer molding of cables and connections, such as undersea cables and connections using additive manufacturing. Design requirements for cables/connections, including form, fit, and function data is provided. The requirements are used to produce a three-dimensional model of a mold, which is converted into a file format that allows for three-dimensional printing and computer-aided manufacturing. A mold is printed utilizing a UV cured resin on a high resolution three-dimensional printer. The mold is then checked to ensure it meets form, fit, and function data. Finally, an cable/connection is molded by mixing polyurethane, injecting it into the mold, and baking. The disclosed method provides significant time and cost savings when compared to prior art steel and aluminum mold manufacturing.

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 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 runner that extends from an injection point to a gate. The gate is positioned adjacent to an opening leading into a mold cavity. In accordance with the present disclosure, the system includes one or more overflow passages that divert flow of the polymer composition so as to temporarily reduce the flow rate and pressure of the polymer composition entering the mold.

This invention relates generally to an apparatus for casting a portion of a tire or other article of manufacture, and, more specifically, to an apparatus that has a gate design that has a circular runner and concentric channel or waste reservoir for separating off-ratio material before it enters the cavity that forms a portion of the fire or oilier article of manufacture. The design may further include a passage that connects the runner to the waste reservoir as well as an air vent that allows trapped gas or air to exit the waste reservoir as it fills with waste material, a valve that Is operative!) associated with the passage for closing and opening the passage at appropriate times, and a nozzle for initially introducing material into the waste reservoir and subsequently into runner.

A resin filling method that includes the steps of filling in a filling step the filling clearance with the molten resin pressurized by the pressurizing unit, through the first flow path and the second flow path, with the laminated core being held between the flow path plate in contact with the upper mold and the lower mold; moving the upper mold and the pressurizing unit up with respect to the flow path plate to create a space between the upper mold and the flow path plate; removing residual resin in a resin removing step remaining in the second flow path in the flow path plate, with the flow path plate being located on the laminated core; and moving in a core removing step the flow path plate up from the laminated core and then removing the laminated core from the lower mold.