A device for securing and/or releasing injection moulds for plastics injection moulding includes a slide retainer that is located in a receiving mould region, can be pushed into predefined, complementary regions of a corresponding sliding mould region and comprises a roller which is rotatably mounted in a housing and over which the sliding mould region can roll. A spring-loaded pressure piece comprises the housing and a slide retainer spring that presses against the housing, for engaging in an opening in the sliding mould region. The housing has a pre-loading projection in a peripheral region for pre-loading by means of the slide retainer spring. One or more fixing screws run through the housing and is/are screwed into a complementary opening in the receiving mould region. A central lead-through means is provided and each of the one or more fixing screws runs through one through-opening of the lead-through means.

A undercut processing mechanism includes: a sliding piece having a molding core for molding an undercut portion; a holder having a guide for guiding the sliding piece so that a molding core is detached from the undercut portion; and a retaining piece slidably accommodated in the holder and slidably engaged with the sliding piece. One of the holders and the retaining piece can advance/retract relative to the other thereof. The retaining piece has a first engagement element and a second engagement element to be engaged with the sliding piece. The sliding piece is guided via the first engagement element and the second engagement element so that the molding core is detached from the undercut portion and moves away from the molded product.

Two molded articles having a cylindrical two-piece split shape is formed by forming two primary cavities in a desired shape with molds assembled together and injecting a molten primary resin into the two primary cavities. An assist material is injected into a secondary cavity into which a molten secondary resin is injected in a state where the two molded articles are located opposed to each other via a space therebetween and internally fitted into one secondary cavity formed by the molds that are assembled together by shifting the positions. A flange portion having any desired shape is disposed on an outer circumferential surface of a resin pipe in a two-layer structure in which an inner surface layer formed of the cured secondary resin is integrated with an outer surface layer formed of the two molded articles. Thus, a portion having any desired shape is easily manufactured on the resin pipe.

Two molded articles having a cylindrical two-piece split shape is formed by forming two primary cavities in a desired shape with molds assembled together and injecting a molten primary resin into the two primary cavities. An assist material is injected into a secondary cavity into which a molten secondary resin is injected in a state where the two molded articles are located opposed to each other via a space therebetween and internally fitted into one secondary cavity formed by the molds that are assembled together by shifting the positions. A flange portion having any desired shape is disposed on an outer circumferential surface of a resin pipe in a two-layer structure in which an inner surface layer formed of the cured secondary resin is integrated with an outer surface layer formed of the two molded articles. Thus, a portion having any desired shape is easily manufactured on the resin pipe.

An apparatus for molding a rotating member includes a main mold including a column part space configured to mold a column part therein, a plurality of blade spaces configured to mold a plurality of blades therein, and a plurality of split bodies disposed along a circumferential direction of the column part and configured to move along a radial direction of the column part. Each of the plurality of split bodies comprises a column part molding surface defining the column part space, and a plurality of blade molding surfaces defining the blade space. Column part molding surfaces of the plurality of the split bodies define the column part space together, and a first blade molding surface provided at one of the plurality of split bodies defines, together with a second blade molding surface provided at another one of the plurality of split bodies, one of the plurality of blade spaces.

A resin molded article manufacturing method comprises forming a cavity having a shape corresponding to a resin molded article by bringing a plurality of resin molding dies into contact with each other, and forming the resin molded article by injecting a resin directly from a resin ejection port into a resin injection gate and filling the cavity with the resin. The forming of the resin molded article includes filling the cavity with the resin while changing a flow of the resin that is headed from the resin injection gate directly toward the cavity by a resin flow changing section that is provided opposite the resin injection gate.

A plastic molding system comprises: dispensing, pre-shaping and shaping cells and a transport subsystem. The dispensing cell has a station for dispensing a dose of plastic feedstock. The pre-shaping and shaping cells each comprise a plurality of stations for shaping the workpiece into a preform shape and into a final shape, respectively. The transport subsystem advances a workpiece along a selected one of a plurality of process paths to form a molded article. Each of the plurality of process paths is defined by a combination of stations of the dispensing cell, the pre-shaping cell and the shaping cell.

A plastic molding system comprises: dispensing, pre-shaping and shaping cells and a transport subsystem. The dispensing cell has a station for dispensing a dose of plastic feedstock. The pre-shaping and shaping cells each comprise a plurality of stations for shaping the workpiece into a preform shape and into a final shape, respectively. The transport subsystem advances a workpiece along a selected one of a plurality of process paths to form a molded article. Each of the plurality of process paths is defined by a combination of stations of the dispensing cell, the pre-shaping cell and the shaping cell.

A window molding apparatus includes an upper mold, a lower mold under the upper mold, and a side mold under the upper mold and adjacent to at least one side of the lower mold. The upper mold includes a first surface, the lower mold includes a second surface having a portion facing the first surface, and the side mold includes a third surface. The first surface includes a first flat surface and a first bent surface extending from the first flat surface, the second surface includes a second flat surface facing the first flat surface and a second bent surface extending from the second flat surface, and the third surface includes a third bent surface contacting one end of the first bent surface and facing the second bent surface.

A window molding apparatus includes an upper mold, a lower mold under the upper mold, and a side mold under the upper mold and adjacent to at least one side of the lower mold. The upper mold includes a first surface, the lower mold includes a second surface having a portion facing the first surface, and the side mold includes a third surface. The first surface includes a first flat surface and a first bent surface extending from the first flat surface, the second surface includes a second flat surface facing the first flat surface and a second bent surface extending from the second flat surface, and the third surface includes a third bent surface contacting one end of the first bent surface and facing the second bent surface.