A mold assembly (1) for injection molding of a plastic pipe fitting (2, 3). The pipe fitting comprises an elbow-shaped or a tee-shaped internal flow channel (4). At least one of the first core member (14) and the second core member (15) of the core package (12, 13) comprises a built-in cooling arrangement (20) for cooling of the core package (12, 13), the cooling arrangement (20) extending longitudinally inside said core member over a substantial length of said core member. The pipe fitting (2, 3) comprises an elbow-shaped or tee-shaped internal flow channel (4) comprising at least two channel parts (5, 6, 7) arranged at a first angle () in relation to each other, the channel parts (5, 6, 7) each having a circular cross-section and a smoothly radiused inner corner face (8) between each two channel parts being at said first angle in relation to each other, the at least one of the channel parts having an inner diameter D, a length L from central corner point to the end of the channel part, the inner corner face having a rounding radius R. The ratio (D/R) of the inner diameter D and the rounding radius R is in the range 2 to 5, and the ratio (L/D) of the length L and inner diameter D is in the range 8 to 3.

A method of fabricating a mold includes 3D printing a first shell using a first material, the first shell having a first interior surface and a first exterior surface, and 3D printing a second shell using a second material different from the first material, the second shell having a second interior surface and a second exterior surface wherein the second interior surface generally conforms to the first exterior surface. The first material may be thermally conductive and the second material may be thermally insulative, and the first and/or second shell may include at least one thermal regulation element formed therein.

A problem exists of prohibitively high costs associated with molds for small run, legacy, or prototype injection molded parts. Further, the lead time on molds is currently on the order of about two weeks. A mold is provided that is formed from three-dimensional printing. The mold includes a series of air and/or water cooling channels to limit thermal stresses to the mold. Additionally, a series of coatings is added to the surface of a 3D printed mold to extend the lifetime of the mold and increase the performance of the mold. The coatings perform a function other than to define a shape of an injection cavity, such as improving thermal conductivity, providing a thermal barrier between the injection material and the mold body, or improving the detachment of the final mold product from the mold body.

A device to thermoform a composite component and injection over-moulding a shape on one face of the composite component in a mould. The mould includes a paired shaping die and punch between them defining a closed cavity. The shaping die is mounted on a transfer device. The transfer device includes a loading/unloading station to load/unload a blank onto/from the shaping die, and an injection and mould-closure station to close the mould and to inject between the punch and the shaping die. The shaping die includes a network of inductors to heat its moulding surface and a cooling network to cool the moulding surface by a circulation of a fluid. The loading/unloading station includes a placement device to place a radiating element facing the moulding surface of the shaping die.

In some embodiments, an injection molding apparatus comprises: a first mold section comprising a first molding surface, wherein the first mold section is configured for attachment to a presser; a second mold section and disposed opposite the first mold section, a thermoelectric device disposed in one of the first and second mold sections and in thermal communication with at least one of the first and second mold surfaces; an electrical control system disposed in electrical communication with the thermoelectric device; the presser in mechanical communication with the first mold section and configured to move at least one of the first and second mold sections toward the other to define a molding space; and an injector for introducing a material to be molded into the molding space.

In some embodiments, an injection molding apparatus comprises: a first mold section comprising a first molding surface, wherein the first mold section is configured for attachment to a presser; a second mold section and disposed opposite the first mold section, a thermoelectric device disposed in one of the first and second mold sections and in thermal communication with at least one of the first and second mold surfaces; an electrical control system disposed in electrical communication with the thermoelectric device; the presser in mechanical communication with the first mold section and configured to move at least one of the first and second mold sections toward the other to define a molding space; and an injector for introducing a material to be molded into the molding space; wherein at least one of the first and second mold sections is formed from a ceramic material.

In the injection compression molding mold, cooling water passages are provided between a fixed-side surface formation portion and a heater, cooling water passages are provided between a movable-side surface formation portion and a heater, and a cavity is formed by the fixed-side surface formation portion, the movable-side surface formation portion, and a looped member. When the fixed-side surface formation portion and the movable-side surface formation portion are heated to predetermined temperature, resin is injected and filled into the cavity. Next, inside of the cavity is pressurized, and then heating is stopped and cooling water is supplied to the cooling water passages to perform cooling. Then, before the resin is completely solidified, the resin in the cavity is compressed while being cooled and solidified.

An improved injection mold for forming an injection molded component. The injection mold includes a main cavity block and a main core block that are moveable with respect to one another. The main cavity block has a cavity block mating face that includes a first mold surface and the main core block has a core block mating face that includes a second mold surface. A plurality of induction heating coils extend within the main cavity block and a plurality of gas inlet channels extend through the main core block. The second mold surface includes a plurality ridges that cooperatively form a continuous gas flow path that is disposed in fluid communication with the plurality of as inlet channels. The continuous gas flow path follows a serpentine shape to provide even and uninterrupted gas flow across the second mold surface.

A mold apparatus comprising: a core portion comprising a core surface, a first induction coil, and an inner core, and wherein the core portion has a core portion mass; a cavity portion comprising a second induction coil and a cavity surface, and wherein the cavity portion has a cavity portion mass; wherein the inner core comprises a non-magnetic material, the core surface comprises a magnetic material, and a density of the non-magnetic material is less than a density of the magnetic material; and wherein the core portion mass and the cavity portion mass differ by less than or equal to than 5%.

A mold, particularly for injection molding, includes a shell defining a cavity delimiting a molding surface, a heat accumulator and inductor heater, configured to heat the heat accumulator. A receiving surface, which is a part of a surface of the shell other than the molding surface, is either exposed to or shielded from the heat of heat accumulator, to bring the entire molding surface to a predetermined temperature to inject the material into the cavity.