The device for demoulding negatives in thermoplastic injection moulds comprises an ejector (1) provided on one of the ends thereof with a figure insert (2) with a profile complementary to the part that is to be moulded, wherein said ejector (1) comprises an outer tube (11) housing an inner cooling tube (12), which cools said figure insert (2). It allows for a device to be provided for demoulding negatives in thermoplastic injection moulds which enables the part to be obtained to be cooled, the cooling circuit reaching the figure area of the mould.

A control device for an injection molding machine includes: a pressure acquiring unit for acquiring resin pressure; an injection control unit for injecting resin into a mold; an ejector control unit for protruding an ejector pin before the resin pressure reaches a predetermined target pressure; and an insertion control unit for causing a supporting member and an attachment plate to support an ejector plate by inserting the supporting member into a gap before the resin pressure reached the predetermined target pressure.

A tool for the injection molding of plastic molded parts has two tool halves movable in relation to each other, one of which has a mold plate carrying at least one mold insert with a multiplicity of mold cavities, or a mold plate with a mold insert support platen, which carries at least one mold insert with a multiplicity of mold cavities. The mold cavities are designed to form molded parts in conjunction with complementary cavities present on the second of the tool halves. The mold insert of each mold cavity is assigned a slide, which is arranged movably over or in a cavity-side surface of the mold insert. The slide has at least one guide element in engagement with a counterpart guide element in the mold insert. A connection bolt extends from the slide in the direction of the mold plate or of the mold insert support platen and is guided in a guide groove of a rotary ring. A plurality of connection bolts of a plurality of slides are arranged circumferentially along the circumference of the rotary ring, distributed in a corresponding number of guide grooves, and the rotary ring is connected to a drive ring arranged on the mold plate or the mold insert support platen.

An injection molding apparatus includes: a mold including a fixed mold and a movable mold facing the fixed mold, and that has a cavity defined by the fixed and movable molds and a runner communicating with the cavity; a mold clamping unit moves the movable mold with respect to the fixed mold; an injection unit injects a molding material into the cavity through the runner; a cutting mechanism at the mold includes a cutter projecting to the runner; a drive unit provided on the mold that drives the cutting mechanism; and a control unit controlling the injection unit, the mold clamping unit, and the drive unit. The control unit controls the injection unit to inject the molding material into the cavity, and then controls the drive unit to cause the cutter to project to the runner, thereby cutting the molding material hardened in the runner.

An injection molding system includes a first unit that has a first injection molding machine configured to inject a first molding material into a first cavity partitioned by a first fixed mold and a movable mold, a second unit that includes a second injection molding machine configured to inject a second molding material into a second cavity partitioned by a second fixed mold and the movable mold, and a movement mechanism configured to, after the first molding material is injected into the first cavity, move the movable mold filled with the first molding material from the first injection molding machine to the second injection molding machine.

An ejector for a molding machine includes an ejector plate and an ejector rod. The ejector plate has an opening and a distance block attached to the ejector plate. The ejector rod includes a first and a second end portion. The first end portion is in the opening of the ejector plate. The ejector rod has a first initial position relative to the ejector plate. The first end portion of the ejector rod is pushed in the direction of the ejector plate by a first force applied to the second end portion of the ejector rod. The ejector also includes a spring around the first end portion of the ejector rod and coupled to the ejector plate. The spring is configured to provide a second force to the ejector plate upon application of the first force to the second end portion of the ejector rod. There is always a gap between the first end portion of the ejector rod and the ejector plate.

Provided is a method of manufacturing a resin retainer having two annular sections. A fixed-side cavity forming mold has a first axial mold surface that is in contact with an axial end surface of a first annular section of the annular sections of a resin retainer having two annular sections, and a first protruding portion protruding from the first axial mold surface. A movable-side cavity forming mold has a second axial mold surface that is in contact with an axial end surface of a second annular section of the annular sections of the resin retainer, and a second protruding portion protruding from the second axial mold surface. A slide core sliding step is performed in which slide cores are slid toward an outer diameter and pocket-forming protruding portions of the slide cores are extracted from a pocket of the retainer, and then a mold opening step is performed in which the movable-side cavity forming mold is opened relative to the fixed-side cavity forming mold.

A manufacturing method of a plastic lens formed by using a metal mold having a fixed mold and a movable mold. The plastic lens comprises a flange part surrounding a lens face, and an image side face of the flange part comprises a black coating part and an outer peripheral part. The manufacturing method may include a molding process in which the plastic lens is molded by using the fixed mold for molding an object side lens face and the movable mold for molding an image side lens face and the flange part, a mold opening process in which the metal mold is opened by moving the movable mold, and a pushing-out process in which the outer peripheral part is pushed out by an ejector pin disposed in the movable mold when the mold opening process is performed or, after the mold opening process has been performed.

At a temperature at the time of molding, an end surface of an ejector pin in a sliding direction is as high as or higher than an upper surface of an upper surface portion of a mold body, the upper surface being adjacent to a cavity on the ejector pin side.

A cassette type mold apparatus includes a sub-runner formed on a parting surface of a fixed side matrix or a movable side matrix, a gate provided in a fixed side cassette mold or a movable side cassette mold and configured to inject a molten resin into a cavity space from the sub-runner, and a hot runner provided on the fixed side matrix so that a tip end thereof is aligned with the sub-runner to be perpendicular to the sub-runner and is in parallel with a mold opening and closing direction. In the cassette type mold apparatus, the movable side cassette mold can be stacked on the fixed side cassette mold in a state in which a cavity and a core are aligned and can be integrally loaded in a direction of a side surface of the entire mold.