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.

An injection molding method that includes: (a) fitting an injection molding machine with an injection mold defining one or more molding cavities, with at least one mold plate provided with one or more channels for circulation of a tempering medium, (b) providing a feed of plastic material, (c) heating the molding cavities by circulating through the channels a first tempering medium, (d) injecting plastic material into the closed heated mold to fill the molding cavities, (e) cooling the molding cavities of the filled closed injection mold until at least partly solidifying the molded plastic parts by circulating through the channels a second tempering medium, (f) opening the injection mold by parting the injector plate from the ejector plate, (g) ejecting the at least partly solidified molded plastic parts by actuation of ejector pins of the ejector plate, and (h) repeating the cycle of steps (c)-(g).

A molding system for directly gas-cooling a molding object includes a cold air provider, two molding parts, a plurality of outlets, at least one air-providing molding part, at least one air passage, and a controller. The two molding parts are closed detachably to co-define a forming cavity therebetween. The outlets are arranged on the air-providing molding part. The air passage is connected to the cold air provider and the outlets. The controller drives the cold air provider to provide cold air to a molding object in the forming cavity directly when the two molding parts are separating.

The invention relates to a mold for small-sized parts, comprising a casing configured to be assembled on a press platen (101, 102) the casing comprising a housing receiving an insert; the insert comprising a housing for a die comprising a molding surface (121, 122); a device for heating the die, the device comprising a rod (131, 132) made of a material susceptible to induction heating mounted in the insert (350) and having one end in contact with the die, a coil (141, 142) surrounding the rod and connected to a high-frequency current generator (151, 152) such that when the coil is electrically powered, it generates an induced current in the rod (131, 132), heating the rod by induction, the rod transmitting heat to the die, wherein an outer diameter of the rod is greater than or equal to an outer diameter of a perimeter delimiting the molding surface (121, 122).

Methods of molding a barrel, such as a syringe barrel having very low draft, are disclosed. Thermoplastic syringes having very low interior draft angels are also disclosed.

The invention relates to a method for producing a plastic part, especially a plastic part for an automobile, by an injection molding method comprising the steps: Using an injection molding device, plastic in a flowable state is injected into the mold cavity of an injection mold, gas under pressure is injected through a gas inlet opening in the injection mold into the mold cavity of the injection mold by means of a gas injection device so that a gas bubble forms within the still flowable plastic, the plastic is heated and kept flowable, at least in a region neighboring the gas inlet opening while the plastic is hardening in the mold cavity, wherein pressure is exerted on the plastic being kept flowable so that an opening in the plastic in the region of the gas inlet opening is sealed, and the plastic part is removed from the injection mold after reaching a sufficient dimensional stability. In addition, the invention relates to a corresponding device.

A process for producing a plastic part for vehicles in an injection molding process, characterized by the following steps: a first plastic charge is injected in the plasticized state into the mold cavity of an injection mold, subsequently, a second plastic charge is injected together with a blowing agent into the mold cavity, the blowing agent leading to the expansion of the second plastic charge injected into the mold cavity, as a result of which the still fluid first plastic charge is pressed from the inside against the walls which delimit the mold cavity of the injection mold, wherein, after the first plastic charge has been injected, a coolant is conducted through the walls which delimit the mold cavity of the injection mold, as a result of which the walls which delimit the mold cavity of the injection mold are actively cooled.

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%.

Methods of molding a barrel, such as a syringe barrel having very low draft, are disclosed. Thermoplastic syringes having very low interior draft angels are also disclosed.