Abstract: A mold split insert for use in a molding stack assembly, and in particular a preform mold neck ring insert for use in an injection molding stack assembly for making bottle mold preforms. The split insert comprises a body with a molding surface configured thereon. The split insert also includes a coolant channel configured in the body with a partition arranged therein. The partition dividing a portion of the coolant channel into a first and a second branch. A transfer coolant channel is configured between the branches.

Abstract: Methods and assemblies related to a rotary automatic transfer rail for injection molding are disclosed. In one aspect, the invention includes a mold assembly. The mold assembly may include first, second, and third mold plates. The mold plates may be positioned generally parallel to one another. The mold assembly may include an automatic transfer rail assembly. The automatic transfer rail assembly may include a rail. The automatic transfer rail assembly may include a carrier. The carrier may have first and second members. The carrier may be translatable along the rail between a first closed position and an open position. The carrier may be rotatable about the rail. In some embodiments, molded articles need not be transferred from mold components to a robot and then back to different mold components.

Abstract: The present invention provides an apparatus for molding a material such as plastic. The apparatus includes a mold body, a first plurality of ribs, and a second plurality of ribs. The mold body includes a molding skin of substantially uniform thickness having a first surface and a second surface. The first surface is adapted to mold a part. The second surface is opposite the first surface. The first plurality of ribs extend from the second surface. A plurality of thermal conduction surfaces are defined on the second surface between the first plurality of ribs. The second plurality of ribs are interleaved with the first plurality of ribs. The second plurality of ribs include end surfaces displaced a substantially uniform distance from the plurality of thermal conduction surfaces to define a plurality of fluid flow conduits adapted to contain a coolant.

Abstract: Contact lens molds and methods of producing soft cast-molded contact lens products are provided. The methods include placing a soft hydrophilic contact lens-forming composition in a cavity formed between a first mold member and a second mold member, subjecting the composition in the cavity to conditions effective to form a contact lens product from the composition, and repeating the placing and subjecting steps a plurality of times, thereby producing a plurality of soft contact lens products. At least the first mold members, and advantageously all of the first and second mold members, are injection-molded with a nucleated thermoplastic polyolefin resin having a melt flow rate in a range of 10 g/10 min to about 40 g/10 min.

Abstract: Disclosed is: (i) a thermal management system of a molding system, (ii) a molding system having a thermal management system, and/or (iii) a method of a molding system having a thermal management system, amongst other things.

Abstract: A baffle for cooling passageways of injection mold tools and the like is made of a polymer material, and includes a divider having a H-shaped cross section with outer surface portions that fit closely against or adjacent cylindrical surfaces of cooling passageways to center the baffle in the passageway arid substantially prevent flow of fluid around the sides of the divider. The baffle may include a plurality of indicia on the divider indicating the length of the divider to permit the length of the baffle to be cut to size to fit a cooling passage of a particular mold tool being constructed.

Abstract: In an optical disc molding device, a heating medium from a low-temperature controller is made to flow in temperature controlling flow passages (passages 3a) formed at locations corresponding to boundary parts of two fixed molds 7 mounted parallel to each other on a fixed platen 3 and in temperature controlling flow passages (passages 6a) formed at locations corresponding to boundary parts of two movable molds 8 mounted parallel to each other on a movable platen 6 to supplement heat exchange.

Abstract: Disclosed is a preferred mold design for producing plastic, molded preforms, which may be blow-molded into a container of a final, desired shape. A preferred mold includes a temperature control system for maintaining the preform mold at a desired temperature. The temperature control system can pass fluid through channels within the preform mold to cool plastic that is injected into the preform mold. In some arrangements, a mold comprises a neck finish mold, the neck finish mold comprising high heat transfer material positioned to transfer heat away from melt within a mold cavity of the mold.

Abstract: A mold pair for molding a plastic container from a parison is provided. The mold pair has a first mold half and a second mold half. The first mold half has a cavity for forming the container, and a flash cooling system. The flash cooling system has a plurality of air distribution jets formed in the first mold half and for directing cooling air to a waste portion of the parison, and an air manifold formed in the first mold half and for directing the cooling air to the plurality of air distribution jets. The second mold half has a cavity for forming the container.

Abstract: An injection-moulding tool for the production of a mould in disc form, in particular in the form of information carriers such as CDs and/or DVDs, wherein the injection-moulding tool comprises a first and a second mirror block, wherein the first and second mirror blocks lie opposite each other and are movable in relation to each other for the opening and closing of the mould, and means for actively controlling the temperature of at least one of the first and second mirror blocks. A method for producing mouldings in disc form utilizing the injection-moulding tool is also disclosed.

Abstract: An object is to provide a disc-molding mold which can increase the degree of transfer of a pattern of a stamper to thereby improve quality of molded products, as well as a molded product and a molding machine. In the vicinity of the outer peripheral edges of first and second disc-shaped members, the cooling capacity of the medium flow passage of the stamper-side disc-shaped member is made lower than the cooling capacity of the medium flow passage of the non-stamper-side disc-shaped member. On the stamper side, the quantity of heat radiated from the outer peripheral edge of the stamper-side disc-shaped member to the outside of the disc-molding mold can be reduced, whereby over-cooling of the stamper-side disc-shaped member can be prevented.

Abstract: A mold apparatus having at least a pair of molds formed with a cavity, at least one pipe accommodator formed in the molds, at least one heat pipe mounted in the pipe accommodator, a heat-cool source part connected to the heat pipe the heat and cool the heat pipe, and a controller to control the heat-cool source part to selectively heat and cool the heat pipe. Thus a mold apparatus to reduce a molding cycle and improve the quality of a molded product's appearance is provided.

Abstract: This invention relates to methods and apparatus for making articles made of polyester, preferably polyethylene terephthalate (PET), having coated directly to at least one of the surfaces thereof one or more layers of thermoplastic material with good gas-barrier characteristics. In one preferred method and apparatus, preforms are injection molded, barrier-coated immediately thereafter, and remain on a mold portion for a time to speed cooling of the completed preform. Preferably the barrier-coated articles take the form of preforms coated by at least one layer of barrier material and the containers are blow-molded therefrom. Such barrier-coated containers are preferably of the type to hold beverages such as soft drinks, beer or juice. The preferred barrier materials have a lower permeability to oxygen and carbon dioxide than PET as well as key physical properties similar to PET.

Abstract: A metal workpiece is formed of a pre-manufactured lower part and an upper piece which is placed thereon using a metal powder sintering process, preferably laser sintering. The lower part is a partial workpiece which is made of a solid piece of metal shaped by machining, forming a ready-to-use workpiece in conjunction with the upper part.

Abstract: A cooling circuit for a neck ring of a preform is conformed to the surface of the neck ring by providing a neck ring in two parts. The first part supports the neck ring and provides strength and durability to the neck ring insert. The second part is formed of porous steel impregnated with highly thermally conductive metal and includes a cooling channel that provides substantially uniform cooling around the neck ring of the preform.

Abstract: An automatic docking system for an injection molding machine having a mold. The docking system includes a moldset with a core plate, a guide on each side of the core plate and moldset guides on a face of the mold. The moldset guides cooperate with the core plate guides to load the moldset into the machine. A water manifold is mounted in the mold and a plurality of water connections extend from the manifold toward a moldset to be mounted in the machine. An air channel is provided in each moldset guide. A core plate separation block is attached to a top end of each core plate guide. Air channels extend through the core plate and the core plate separation blocks. Each separation block includes an air opening for engaging an air opening on a moldset guide when the moldset is loaded into the machine.

Abstract: A method and apparatus for controlling the temperature of an injection mold passes pressurized air contained in an air supply tube through an orifice into an exhaust channel, wherein the pressure of the air in the exhaust channel is lower than the pressure of the air in the air supply tube. As the pressurized air is released through the orifice, cooling is produced that can be applied to a portion of an injection mold where cooling is desired, in order to control the temperature of that portion of the injection mold.

Abstract: A plug baffle device for installation in a coolant passage within a mold, the plug baffle device having its coolant-encountering blade mechanically attached to a base member, and methods for making such plug baffle device. Advantages include acceptance of greater torque and less susceptibility to damage from high torque. In certain highly preferred embodiments, the base member includes an extension portion facilitating mechanical engagement and providing other substantial advantages.

Abstract: An arrangement to assist in heat transfer through a mold for applications such as injection molding of plastics material including at least one closed chamber within the mold, the chamber being only partially filled with liquid and a remainder of the chamber being filled with substantially only vapor of the liquid within the chamber, at least a portion of the chamber being positioned to transmit heat from a targeted location of the mold into liquid within the chamber, and condensing means adapted by reason of heat exchange to effect condensation of vapor within the chamber, the mold being arranged in that the liquid such as water is arranged to be held in the chamber in such a way that the liquid will be distributed to reach or be held at different heights within the chamber. This is achieved in one case by the addition of a foaming agent in the liquid. In another case by having a flock attached to the inner surface of the chamber.

Abstract: A three level stack mold machine comprising a machine frame, a fixed platen mounted on the frame, guide rails mounted on the frame, a movable platen mounted on the guide rails and two carriages mounted on the guide rails between the fixed platen and the movable platen. A hot runner plate is mounted on the fixed platen and water manifolds are mounted on each carriage assembly. Each manifold has water connectors extending upwardly therefrom. A hot runner plate is mounted on each manifold and connected to a first group of the water connectors. A core plate is mounted on the movable platen and connected to water connectors extending upwardly from a water manifold attached to the movable platen. Core plates are mounted on the hot runner plates on the carriage assemblies. The core plates have water connectors on a bottom surface thereof connected to a second group of the water connectors. Cavity plates are mounted on the hot runner plates and connected to hot runner nozzles extending out of the hot runner plates.

Abstract: A mold portion of a molding tool for making plastic articles includes a base body defining a cavity surface and having formed therein at least one heating channel, and at least one cooling channel separated from the heating channel and having a cross section which is smaller than a cross section of the heating channel. The cooling channel is positioned hereby closer to the cavity surface than the heat channel and thus is in an area between the heat channel and the cavity surface, thereby defining a cavity-proximal cooling channel and a cavity-distal heat channel. Before the injection process, the cavity surface is heated by the heat channel to a higher temperature than the demolding temperature of the plastic article to be formed. At the end of the injection process, the cavity surface is cooled by the cooling system.

Abstract: A gate insert (10, 110) for a stack assembly in an injection molding machine having a gate (16, 116) through which a melt of thermoplastics material enters a mold cavity (14, 114). The gate insert has a cooling channel (18, 118) surrounding, and substantially uniformly spaced from, the gate (16, 116). The cooling channel has an inner surface with a profile substantially parallel to the gate. The cooling channel is further defined by either a structural insert in the form of a split ring (30) or by a recess (23) in a two-piece gate insert having interconnecting surfaces (111a, 111b).

Abstract: The present invention relates to an apparatus for producing solid active ingredient-containing forms from an active ingredient-containing formulation which comprises at least one polymeric binder. The apparatus according to the invention has at least one extruder 1 for continuous plastication of the formulation and at least two injection units 2 which are provided separate from one another, each of which is connected to the extruder 1, and through which the formulation can be injected into at least one mold 3.

Abstract: A molding assembly includes a mold body, an insert block, and a cooling channel. The mold body has first and second surfaces which are opposite to each other, and a peripheral surface interconnecting the first and second surfaces. The mold body further has a plurality of die cavities, a plurality of runners, and a recess opening at the first surface. The recess extends from the first surface toward the second surface, and ends at a recess bottom surface disposed away from the first surface. The insert block is fitted within the recess and has an inner surface confronting the recess bottom surface, an outer surface opposite to the inner surface, and a side wall interconnecting the inner and outer surfaces. The cooling channel is confined by the recess bottom surface of the recess and the inner surface of the insert block.

Abstract: The transfer plate is energized and heated uniformly in the state in which the transfer plate heated through the electric resistance heating is separated slightly from the specular surface of the specular plate, then, immediately before the die is closed, the transfer plate is pressed against the specular surface to adhere thereto and, at the same time, the resin material is supplied to the cavity quickly and, after that, at the same time as the molded product is shaped completely, the transfer plate is de-energized so that the resin material in the cavity is quenched at the controlled temperature of the specular plate that is set to be lower than the heating temperature of the transfer plate.

Abstract: A method and apparatus for thermostatically controlling mold temperatures. The molding apparatus includes at least two die sections and a thermostatic control valve. At least one of the die sections has a cooling channel extending through portions of the die section. The cooling channel has an inlet end connected to a source of cooling fluid and an outlet end connected to an exhaust line. The thermostatic control valve is interposed in the exhaust line and has closed and open conditions. In the closed condition, the flow rate of fluid through the cooling channel is restricted causing the temperature of the die section to increase. In the open condition, the flow rate of fluid through the cooling channel is increased causing the temperature of the die section to decrease. The thermostatic control valve automatically moves between the open and closed conditions responding to the temperature of fluid through the cooling channel.

Abstract: A heat exchange apparatus for a metal mold is provided, which includes a heat exchange passage provided for the metal mold, a first supply unit for supplying hot heat carrier to the heat exchange passage and a second supply unit for supplying cold heat carrier to the heat exchange passage. The heat exchange apparatus performs heat exchange for the metal mold by supplying the hot heat carrier and cold heat carrier to the heat exchange passage switching alternately. And the heat exchange apparatus has a feature that it includes an air supply unit for supplying air to the heat exchange passage so that the heat carriers are purged when the hot heat carrier and cold carrier are switched.

Abstract: A form, fill and seal packaging machine for forming, filling and sealing a carton, molds a closure directly onto the carton. The machine includes a carton erection station adapted to receive a carton in a generally flat form and to erect the flat form carton into a tubular form defining an internal carton region. A direct injection molding station has an internal mold tool and an external mold tool. The internal mold tool is configured for receipt within the internal carton region and the internal mold tool and the external mold tool are configured to receive and clamp the carton therebetween. The direct injection molding station further includes a polymer injection system for injecting polymer from a location external of the carton to the internal mold tool. The closure is directly molded in place on the carton. A mold tool set, a method for carrying out the molding and a closure molded thereby are also disclosed.

Abstract: There is provided an arrangement of a mold including a mold base (1), a cavity block (2) provided within the mold base (1), a heat insulating layer (5) provided between the mold base (1) and the cavity block (2), and a system of a flow passage (A) through which a heating medium and a cooling medium are alternately and repeatedly supplied, wherein a space is provided at a contact portion between the cavity block (2) and the mold base (1) based on anticipation of a thermal expansion of the cavity block (2). Further, the cavity block (2) may be arranged to have inlet and outlet slots communicating with the channel (A), and the inlet and outlet slots may be attached with conduits thermally insulated from the mold base (1).

Abstract: A form, fill and seal packaging machine for forming, filling and sealing a carton, molds a closure directly onto the carton. The machine includes a carton erection station adapted to receive a carton in a generally flat form and to erect the flat form carton into a tubular form defining an internal carton region. A direct injection molding station has an internal mold tool and an external mold tool. The internal mold tool is configured for receipt within the internal carton region and the internal mold tool and the external mold tool are configured to receive and clamp the carton therebetween. The direct injection molding station further includes a polymer injection system for injecting polymer from a location external of the carton to the internal mold tool. The closure is directly molded in place on the carton. A mold tool set, a method for carrying out the molding and a closure molded thereby are also disclosed.

Abstract: A mold cooling device includes an air feeding and discharging circuit 22 which effects the driving by air of a pump section 1 for feeding a cooling liquid to a fluid flaw passageway 65a fanned in a mold 64 and the feeding of air to the fluid flow passageway 65a. Letting (Dx) be the outer diameter-corresponding dimension of the holed convex portion 53x of a cast article 64x, (D1) be the outer diameter of the pin section 65 of the mold 64, (t1) be the outer peripheral thickness of the pin section 65, and (T1) be −5.103+(0.621×Dx)−(1.068×D1)+(3.61×t1), the time (T) for feeding cooling liquid to the fluid flow passageway 65a after completion of the pouring of molten metal into the mold 64 is set so that the relation T1-0.5 seconds ≦T≦T1×0.5 seconds is satisfied.

Abstract: An apparatus for protecting thermocouple circuits in an injection molding system includes a protection circuit for each thermocouple pair. The protection circuit includes a resettable fuse disposed in series with each thermocouple wire for preventing high leakage current from passing through, and a capacitor connected to the two wires of a thermocouple to filter out AC line noise. The protection circuits are integrated in a junction box used to connect a heater power cable and a thermocouple control cable to the hot-half of the molding machine.

Abstract: A cooling apparatus and method for the post mold cooling of injection molded articles where an exterior portion of the article is exposed to a cooling atmosphere separately from any other cooling of the article. More particularly, the external surface of a neck finish portion of a preform is cooled by way of a cooling fluid stream which is specifically directed at the external surface.

Abstract: A form, fill and seal packaging machine for forming, filling and sealing a carton, molds a closure directly onto the carton. The machine includes a carton erection station adapted to receive a carton in a generally flat form and to erect the flat form carton into a tubular form defining an internal carton region. A direct injection molding station has an internal mold tool and an external mold tool. The internal mold tool is configured for receipt within the internal carton region and the internal mold tool and the external mold tool are configured to receive and clamp the carton therebetween. The direct injection molding station further includes a polymer injection system for injecting polymer from a location external of the carton to the internal mold tool. The closure is directly molded in place on the carton. A mold tool set, a method for carrying out the molding and a closure molded thereby are also disclosed.

Abstract: A molding apparatus and molding method are provided for molding of small objects from a thermoplastic elastomer. The apparatus includes a heated transfer plate assembly, an insulation plate assembly adjacent the transfer plate assembly and a cooled cavity plate assembly. The transfer plate assembly is heated sufficiently to maintain a thermoplastic elastomer in a molten state. The cavity plate assembly is cooled sufficiently to solidify a thermoplastic elastomer injected into cavities of the cavity plate assembly.

Abstract: High quality articles which are large or of complex shapes are difficult to mold from low density expandable thermoplastic polymers, such as LDPP (Low Density PolyPropylene) because their low heat capacity density causes premature cooling and setting as they try to reach extremities and narrow regions of an injection mold cavity. To overcome these problems the invention provides cycling, during article production, of heating and cooling in the regions of the mold that are near these extremities and narrow regions. The resulting system offers production of low material cost polymer articles in lower cost, lower pressure injection molds and machine systems.

Abstract: In a mold device for injection molding of synthetic resin having a cavity surface alternately heated and cooled and a bottoming structure for producing a product having a bored portion like a window, a bottoming portion for the production of a product having a bored portion is provided on a parting surface of the mold and a vacant space is provided in the bottoming portion. Thus, the contact area of the bottoming portion is reduced and a contact pressure of the bottoming portion and thermal strain due to a temperature difference between the cavity side mold and core side mold are reduced, so that it is possible to prevent occurrence of crack in a portion located immediately outside the window of the product.

Abstract: An apparatus for molding an optical lens from a molten thermoplastic resin material using an injection molding machine, and including means for forming a mold cavity defined by a pair of opposed, spaced apart inserts shaped and configured to define opposite faces of said optical lens and having a plurality of overflow wells surrounding the mold cavity means for injecting a predetermined optimum volume of resin material into said mold cavity; means for controllably moving at least one insert relative to the other insert, wherein such relative insert motion is driven by a power cylinder capable of providing a variable compression stroke during molding and is initiated prior to completion of said injection; means for controlling the velocity and/or compressive force of the compression stroke of said power cylinder such that said compression is conducted at a first selected relatively high velocity, thus urging excess resin from said cavity into said overflow wells after which the compression force is varied to a

Abstract: A multiple cavity injection molding system having at least two single cavity injection molds for forming optical discs. The single cavity injection molds are physically and thermally separated from each other. Each single cavity injection mold has first and second mating portions which are movable between a closed position in which a mold cavity is formed and an open position in which the object is removed from the mold cavity. A resin delivery system is operatively coupled to the first mating portion of each of the single cavity injection molds for delivering resin into each of the two single cavity injection molds, and an ejector system is operatively coupled to the second mating portion of the single cavity injection mold for ejecting the molded disc from the mold cavity.

Abstract: The temperature of cooling air to a manifold for distribution to molds of a glass manufacturing machine is controlled by passing untreated air through an indirect heat exchanger in indirect heat exchange relationship with water flowing through a coil in the indirect heat exchanger before treated air from the indirect heat exchanger is passed through a blower for distribution to the manifold. Water for treating the air flowing through the indirect heat exchanger is pumped through the coil from a water cooling tower that is used in a glass manufacturing plant, either at a first temperature from a first outlet of the water cooling tower or at a second temperature from a second outlet of a water cooling tower, or a mixture of water from the first outlet and the second outlet. In a first embodiment, water from the first outlet and water from the second outlet pass through a temperature controlled three-way mixing valve before delivery to a pump for delivery to the indirect heat exchanger.

Abstract: A mold half-block possesses at least one mold recess defined transversely by the working face of a shell provided with heat-transfer parts that are intrinsic and both-way (both heating and cooling), the shell including a base that receives all of the heat-transfer parts and a removable insert fitted on the base and carrying the working face, the insert having no intrinsic heat-transfer parts and being thermally regulated solely by heat transfer with the base. The insert is in the form of a cap which fits over at least a head portion of the base, and the heat-transfer parts of the base are allocated to the head portion of the base having the insert fitted thereover.

Abstract: An injection-moulding tool (10) for the production of mouldings in disc form, in particular in the form of information carriers such as CDs and/or DVDs, which injection-moulding tool (10), to form an injection mould (25), includes a first and a second mirror block (11 and 12, respectively), which lie opposite each other and are movable in relation to each other for the opening and closing of the mould, and also a form ring (20), which concentrically encloses the first mirror block (11) and closes off the injection mould (25) towards the outer edge and is movable in relation to the first mirror block (11), better process stability, better quality of the mouldings and shorter waiting times during starting-up are achieved, inter alia, by facilities for active temperature control of the form ring (20) being provided.

Abstract: In a method for the internal cooling of a rotating object (4), liquid gas from at least one inlet channel (61) in a fixed object (5) is pressed into a ring-shaped groove (62) located between the fixed object (5) and the rotating object (4). From the ring-shaped groove (62) the liquid gas is pressed into at least one channel (63, 64.1, 64.2) in the rotating object (4) and brought to a part to be cooled (15). The liquid gas, upon contact with the part, evaporates and expands while absorbing heat, thereby cooling the part. The area surrounding the part to be cooled (15) may be designed as an expansion chamber (65). The method can be used to cool molded parts in injection molding machines with rotating molds (1), thereby achieving shorter cycle times.

Abstract: In an injection molding apparatus 62 on which a disk molding die is mounted, wherein the disk molding die is comprised of a stationary die 10 and a movable die 20, a plurality of principal parts of which are separately temperature controlled by media, a control device 50 of the injection molding apparatus 62 is provided with a temperature control mechanism for controlling temperatures of the media which are pumped by a plurality of temperature control devices 51a and 51b in order to control the temperatures of said principal parts.

Abstract: A mold and an assembly of a device for cooling a mold include an annular channel system that surrounds the mold. The channel system has a channel having at least one entrance for supplying a cooling medium to the interior of the channel. The channel has at least one mold-facing outlet aperture for the cooling medium. The channel is adapted for substantially one tangential flow direction of the cooling medium around the mold.

Abstract: Apparatus for handling and cooling preforms, comprising a collection and translation element (2) provided with a plurality of receptacles (10) arranged according to a definite geometrical distribution pattern and adapted to accommodate a corresponding plurality of preforms (30), as well as a cooling element (3). Said collection element is displaceable from a preform loading position to several distinct positions, arranged above said cooling element, which is provided with a plurality of cups collected into a plurality of distinct, but similar geometrical distribution patterns that are translated with respect to each other in such a manner as to prevent them from interfering with each other.

Abstract: An injection molding apparatus comprises a manifold having a manifold channel for receiving a melt stream of molten material under pressure and delivering the melt stream to a nozzle channel of a nozzle. A mold cavity receives the melt stream from the nozzle and the nozzle channel communicates with the mold cavity through a mold gate. A thermocouple is coupled to the mold core of the mold cavity in order to measure the temperature of the molten material in the mold cavity.

Abstract: A cooling probe is provided for use with a mold section having an elongate blind passage extending therein. The cooling probe is made up of an axial spool having an outer peripheral surface and an internal inlet and outlet passage. The inlet tube connects to the spool and extends into the mold blind passage. An outlet and an inlet swivel fitting telescopically sealingly cooperate with the spool outer periphery and provide outlet and inlet fluid connectors which can be freely rotated relative to the spool to facilitate easy installation and removal of the cooling probe from the mold section.

Abstract: A temperature control unit for dies and molds, particularly for pressure die-casting or injection-molding of aluminum and alloys thereof, plastic materials and the like, comprising a die or mold cooling circuit through which pressurized water flows. A water feed pump is connected to the circuit and is adjustable to a pressure which is higher than the evaporation pressure of water at a preheating temperature of the water, which can be detected by a first sensor for detecting the temperature of the water. The circuit includes a circulation pump, a water overflow valve which can be set to a lower pressure than the feed pump, and a heating unit which is controlled by the first temperature sensor. A die or mold temperature sensor is further provided which controls the feed pump.

Abstract: Injection molding hot runner apparatus having a cooled mold core with an elongated body portion with a front portion or head. A cooling tube extends centrally in body portion of the mold core. A cooling fluid circuit extends from the open front end of the cooling tube outwardly through a number of spaced radial bores. Each radial bore connects to an L-shaped duct leading back to a cylindrical space around the cooling tube.