A method of manufacturing a plate with an insulating frame by using a metal mold. The plate includes an outer edge portion having a concavo-concave shape, and the metal mold includes a plurality of gate portions for injecting a molding material that forms the frame. The gate portions of the metal mold are at locations that correspond to the concave portions of the metal plate such that when the molding material is injected into the metal mold, an injection pressure of the molding material that can deform the metal plate will not deform the metal plate to an extent that deteriorates insulation resistance that is provided by the frame.

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.

A resin gear includes a web with a side surface on which a first annular rib and a second annular rib are formed to be concentric with a boss. The web has an inner web portion coupling the first annular rib to the second annular rib, and an outer web portion coupling the second annular rib to a rim. The inner web portion is formed to have a thickness gradually reduced from one intersection point toward another intersection point, the intersection points being intersection points of a virtual radial direction line passing through a center of the boss with the second annular rib. The first annular rib has a side surface on which only one gate mark of an injection molding is formed at a position on a radially outer side with respect to a first tooth portion and a position biased to the other intersection point on the virtual radial direction line.

A distal end cover for an endoscope molded by injecting resin into a mold for molding, attached to a distal end member of an insertion portion in the endoscope, a raising base being provided in the distal end member , covering at least a part of the distal end member, and having an opening portion configured to expose a space in which the raising base is housed to an outside, includes a thin portion having one end connected to a periphery portion of the opening portion and extending linearly and two resin injection gate marks disposed in such a manner that the thin portion is located between the two resin injection gate marks, in which the two resin injection gate marks are disposed at positions where the resin injected into a cavity through a gate of the mold forms a weld line along the thin portion.

An injection molded lens, to which the hot runner according to an embodiment of the present invention includes: a primary sprue; a primary runner which has a central portion connected to the primary sprue and an extension portion extending radially from the central portion; a secondary sprue of which one end is connected to the extension portion of the primary runner; a secondary runner which has a top thereof connected to the other end of the secondary sprue, has an annular shape and a thin plate shape, and has a plurality of protrusions formed on an outer circumference thereof; a plurality of gates which are connected to ends of the plurality of protrusions of the secondary runner; and a plurality of cavities connected to the plurality of gates.

An injection molded lens, to which the hot runner according to another embodiment of the present invention includes: a primary sprue; a primary runner which has a central portion connected to the primary sprue and an extension portion extending radially from the central portion; a secondary sprue of which one end is connected to the extension portion of the primary runner; a secondary runner which has a top thereof connected to the other end of the secondary sprue, has a polygonal shape and a thin plate shape, and has a plurality of protrusions formed on an outer circumference thereof; a plurality of gates which are connected to ends of the plurality of protrusions of the secondary runner; and a plurality of cavities connected to the plurality of gates.

A resin gear includes a web with a side surface on which a first annular rib and a second annular rib are formed to be concentric with a boss. The web has an inner web portion coupling the first annular rib to the second annular rib, and an outer web portion coupling the second annular rib to a rim. The inner web portion is formed to have a thickness gradually reduced from one intersection point toward another intersection point, the intersection points being intersection points of a virtual radial direction line passing through a center of the boss with the second annular rib. The first annular rib has a side surface on which only one gate mark of an injection molding is formed at a position on a radially outer side with respect to a first tooth portion and a position biased to the other intersection point on the virtual radial direction line.

A one-step injection molding mold of a tubular product. The mold divides a product into two parts for one-step injection molding, and includes a mounting retainer plate, runner stripper plate, front and rear mold plates, ejector retainer plate, ejector baseplate and a mounting baseplate, which are stacked, wherein the ejector retainer plate and baseplate are fixed together, two side edges thereof having square blocks, a first and a second hydraulic cylinder are arranged at the top of the mold, a third hydraulic cylinder is arranged on the external side surface of the mounting baseplate, and a fourth hydraulic cylinder is arranged on one side surface of the front mold plate adjacent to the rear mold plate. Further, a one-step injection molding method of a tubular product, including steps 1-6. The mold and the molding method thereof may increase the product yield and ensure a safe production process.

A mold for manufacturing a reel component member, the mold comprises a hub formation portion configured to form a circular tube shaped hub; a flange formation portion configured to form a flange integrally provided at one end portion of the hub; a bottom plate formation portion configured to form a bottom plate that is provided with a ring shaped reel gear at the one end portion or another end portion of the hub and that includes a plurality of hole portions provided at equal intervals on the reel gear; a gate that is disposed further to a radial direction inside than a wall face of the hub formation portion that is configured to form an inner peripheral face of the hub; and an anticorrosion coating that is applied to a wall face of the hub formation portion that is configured to form an outer peripheral face of the hub.

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.

A method of injection molding a building product includes providing an injection mold with a plurality of gates located adjacent a perimeter of the injection mold. The method further includes commingling a first material and a second material into a flow, the second material comprising a color that contrasts with a color of the first material and injecting the commingled flow into the plurality of gates to form a building product. Thereafter, the method includes removing the building product from the injection mold. The second material extends through an interior of the building product and appears as contrasting streaks on an exterior of the building product to form a variegated grain appearance. The method also includes notching a portion of the building product, such that the building product has a substantially linear grain in an exposed portion thereof.