Abstract: The present invention is a method that enables continuous injection molding of a thermosetting resin composition and reuse of an unnecessary part produced during the molding. The method includes injecting a thermosetting resin composition into a mold while a curing reaction of the resin composition is incomplete. The thermosetting resin composition is then cooled in the mold until becoming semi-cured and removed as a semi-cured product from the mold. The semi-cured product is separated from the unnecessary part and separately heated to progress a thermosetting reaction of the thermosetting resin composition. The unnecessary part may be used as a reworked raw material by regrinding the unnecessary part and mixing it with a fresh thermosetting resin composition. Then, a resultant mixture is used to perform a new injection molding.

Abstract: Systems and methods are disclosed herein that generally involve CED devices with various features for reducing or preventing backflow. In some embodiments, CED devices include a tissue-receiving space disposed proximal to a distal fluid outlet. Tissue can be compressed into or pinched/pinned by the tissue-receiving space as the device is inserted into a target region of a patient, thereby forming a seal that reduces or prevents proximal backflow of fluid ejected from the outlet beyond the tissue-receiving space. In some embodiments, CED devices include a bullet-shaped nose proximal to a distal fluid outlet. The bullet-shaped nose forms a good seal with surrounding tissue and helps reduce or prevent backflow of infused fluid.

Abstract: Device and method for the production of a mold having a fiber-reinforced support and connected therewith at least one add-on piece featuring synthetic material, with the device having at least one first tool component (10) and a second tool component (20), at least one of which is movable relative to the other; in this way, the device can be opened to insert a fiber-reinforced mat (30) between the respective pressing surfaces (11, 21) of the two tool components (10, 20), and closed for pressurizing and molding the mat (30), which produces the fiber-reinforced support, and with the second tool component (20) having at least one nozzle (22) to supply a liquefied synthetic material, and the first tool component (10) having at least one cavity (12) away from the nozzle to form the add-on piece, characterized in that the second tool component (20) has at least one cavity (24) at the nozzle so that the add-on piece can be produced and integrated by introducing synthetic material through the nozzle (22) and through

Abstract: The present invention concerns an adaptor plate for connecting a cover plate to a plurality of piston housings of an injection molding machine, wherein the adaptor plate has a first fluid passage and a second fluid passage for feeding a first and a second control fluid into the piston housings, wherein the first fluid passage has at least one first fluid passage inlet for receiving the first control fluid and a plurality of first fluid passage outlets for discharge of the first control fluid to the piston housings and the second fluid passage has at least one second fluid passage inlet for receiving the second control fluid and a plurality of second fluid passage outlets for discharge of the second control fluid to the piston housings.

Abstract: A controlled-volume spray deposition system has a fluid feed system including a pair of bi-directional, counter-rotating rollers to dispense fluid as a first surface, the rollers operable to rotate in a first direction to dispense the fluid, a second surface positioned to receive the fluid when the rollers rotate in the first direction, and the rollers operable to rotate in a second direction to retract the fluid to cause the fluid to stretch and form a filament until it breaks to form a spray. A method of generating a controlled-volume spray includes feeding fluid between two counter-rotating rollers as a first surface as they rotate in a first direction until the fluid contacts a second surface, reversing the counter-rotating rollers such that they pull the fluid to form a fluid filament, and causing the filament to break into a spray.

Abstract: An edge-gated injection molding apparatus is disclosed having an injection manifold assembly for distributing a melt stream of moldable material to a plurality of mold cavities aligned on opposing sides of the injection manifold assembly. The injection manifold assembly includes a plurality of melt outlets with each melt outlet being in fluid communication with a respective mold cavity, and a plurality of biasing components disposed along a centerline of the injection manifold assembly. A nozzle seal is disposed between each injection manifold assembly melt outlet and its corresponding mold cavity, with an upstream end of the nozzle seal being slidably disposed against its respective melt outlet. Each biasing component is disposed between a pair of melt outlets and corresponding nozzle seals for biasing the melt outlets and nozzle seals outward from the centerline of the injection manifold assembly toward their respective mold cavities and applying a preload thereto.

Abstract: A locating ring has a metal body with a ring shape and having a perimeter surface facing radially outward, a center axis defined by the body, a mounting face, and a locating face spaced from and facing opposite the mounting face along the axis. The locating ring has a guard connected to the body and made of a material that is softer than the metal body. The guard is sized to be radially within the perimeter wall and to project axially beyond the locating face.

Abstract: Systems and methods may include a gas source, a gas delivery circuit, and a nasal interface allowing breathing ambient air through the nasal interface. A gas flow path through the nasal interface may have a distal gas flow path opening. A nozzle may be associated with a proximal end of the nasal interface a distance from the distal end gas flow path opening. At least a portion of an entrainment port may be between the nozzle and the distal end gas flow opening. The nozzle may deliver gas into the nasal interface to create a negative pressure area in the gas flow path at the entrainment port. The nasal interface and the nozzle may create a positive pressure area between the entrainment port and the distal end gas flow path opening. Gas from the gas delivery source and air entrained through the entrainment port may increase airway pressure or lung pressure or provide ventilatory support.

Abstract: A plurality of connecting rods are attached to an injection device located opposite a stationary platen on a base structure of an injection molding machine. The stationary platen is provided with a magnetism generating unit formed of a permanent magnet, and the connecting rods are provided with a magnetic body. As the magnetism generating unit and the magnetic body are attracted to each other by magnetism, a nozzle of an injection unit is brought into contact with a mold. By this structure, the stationary platen can be prevented from inclining during nozzle touch operation.

Abstract: An injection interface device comprising a wedge having a first surface mountable over the joint between the mold and the terminal element and a second surface being inclined with respect to the first surface. A fixation element is mountable against the second surface and an attachment element. The device is configured so that it avoids or prevents the movement of the wedge in a direction parallel to the mold and the movement of the fixation element in a direction perpendicular to the mold so that a displacement of the fixation element parallel to the mold makes a displacement of the wedge in a direction perpendicular to the mold so that the wedge presses against the terminal element to seal it.

Abstract: A nozzle-locating insulator (300), comprising: a body assembly (302), having: a spring-facing surface (304) including: spring-contact sections (306); and spring-noncontact sections (308) interposed between the spring-contact sections (306).

Abstract: An injection interface device comprising a wedge having a first surface mountable over the joint between the mold and the terminal element and a second surface being inclined with respect to the first surface. A fixation element is mountable against the second surface and an attachment element. The device is configured so that it avoids or prevents the movement of the wedge in a direction parallel to the mold and the movement of the fixation element in a direction perpendicular to the mold so that a displacement of the fixation element parallel to the mold makes a displacement of the wedge in a direction perpendicular to the mold so that the wedge presses against the terminal element to seal it.

Abstract: An edge-gated injection molding apparatus is disclosed having an injection manifold assembly for distributing a melt stream of moldable material to a plurality of mold cavities aligned on opposing sides of the injection manifold assembly. The injection manifold assembly includes a plurality of melt outlets with each melt outlet being in fluid communication with a respective mold cavity, and a plurality of biasing components disposed along a centerline of the injection manifold assembly. A nozzle seal is disposed between each injection manifold assembly melt outlet and its corresponding mold cavity, with an upstream end of the nozzle seal being slidably disposed against its respective melt outlet. Each biasing component is disposed between a pair of melt outlets and corresponding nozzle seals for biasing the melt outlets and nozzle seals outward from the centerline of the injection manifold assembly toward their respective mold cavities and applying a preload thereto.

Abstract: The invention disclosed herein is a device to prevent damage from molten plastic to electrical wiring, heater bands and insulation of an injection molding machine. Specifically, the device consists of a flat metal disc with an aperture in the center which attaches to the distal end of the nozzle housing of an injection molding machine. When the nozzle of the injection molding machine extends through the aperture of the flat metal disc to inject molten plastic into a mold, the flat metal disc prevents molten plastic from entering the nozzle housing and damaging the electrical wiring, heater bands and insulation of the injection molding machine.

Abstract: An injection molding shutoff assembly includes a chamber containing a movable body that is biased to a rear position in the chamber by a magnet in the movable body. In the rear position, the movable body provides a seal and prevents flow of molten plastic through the assembly. When the movable body is in a forward position, one or more passages permit flow of the molten plastic around the movable body and to an exit in the chamber, leading to one or more molds. An injection molding machine nozzle tip has a beveled front end which, when in an engaged position, seals with an exterior seat of the assembly block defining the chamber and protrudes into the chamber to prop the movable body to the forward position. A portion of the assembly block proximate the opening for the nozzle tip is made of ferromagnetic material, while the rest is not.

Abstract: A locking apparatus for a machine having multiple stems which axially reciprocate with respect to a stationary unit by linkage with a reciprocating common plate. The locking apparatus includes: (a) a first locking assembly capable of alternatively locking and unlocking one of the stems to the common plate; and (b) a second locking assembly capable of alternatively locking and unlocking one of the stems to the stationary unit. The second locking mechanism is configured so that, when the first locking assembly locks a stem to the common plate, the second locking mechanism automatically unlocks that stem from the stationary unit, and when the first locking assembly is unlocked from the common plate, the second locking mechanism automatically locks that stem to the stationary unit.

Abstract: A hip spacer mold forming a spacer with a spacer stem connected to a spacer head has a stem portion for forming a spacer stem. The hip spacer mold also has a plurality of interchangeable head modules configured for alternatively forming spacer heads of a plurality of different predetermined sizes. The head modules are configured to be disposed adjacent the stem portion.

Abstract: To improve the flow symmetry and the molding quality, it is presented a valve pin bushing for the hot runner of an injection mold, including two input channels, each having a geometric axis and through which the material to be injected can enter through an outlet into, and an output channel, which extends along a longitudinal axis up to an output from which the material can exit the valve pin bushing. The portions of the geometric axes, which extend at the outlet are arranged so that on any imaginary plane passing through the longitudinal axis there lies at most one portion.

Abstract: A plastic material injection molding system includes a feeding nozzle, a forming mold having a cave therein, and a material-passing mold having a runner therein. The runner communicates both the feeding nozzle and the cave, and has two curved parts therein for slowing down the plastic material injected from the feeding nozzle in order.

Abstract: An injection system, in an apparatus for injection-moulding plastics, comprises a manifold plate (2) having an injection nozzle (3) closed by a valve stem (7) commanded by a dual-effect pneumatic linear actuator (8, 9) wherein a piston cylinder (8) is compressed between a back plate (10) and a hot runner manifold (5). The piston cylinder bounds an annular gap into which the compressed air that drives the actuator can flow.

Abstract: An apparatus for molding a thermoplastic package part(s) to an end portion of a container body includes inner and outer mold elements between which a mold cavity per package part is formed. At least one of these mold elements is at least partly freely suspended. When one package part is molded with the mold elements, plastic melt is injected in a first number ?1 of points in the cavity, an island of plastic melt for each point is formed inside the cavity, and the distribution of the points causes a force center to pass through a surface defined by a parallel projection of each first number of islands on a plane orthogonal to a direction of the compression force, and when the first number >1, a second number of imaginary straight lines interconnecting a third number of parallel projections such that the surface is at its maximum.

Abstract: A prosthetic mold for forming a prosthesis is disclosed. The prosthesis can include a bone mating surface, an articulating surface, and an intermedullary post. The prosthetic mold can include a first portion, a second portion engageable with the first portion, and an injection portion. The first portion can be configured to form the articulating surface. The second portion can be configured to form the bone mating surface and define an intermedullary post cavity. Engagement between the first and second portions can define a mold cavity. The injection port can be axially aligned, and in communication, with the intermedullary post cavity. The injection port can engage an injection assembly. In one embodiment, the prosthetic mold is configured to form a tibial prosthesis. In another embodiment, the prosthetic mold is configured to form a femoral prosthesis.

Abstract: A mold-tool system (100) of a runner system (150), the mold-tool system (100) comprising: a manifold extension (102) being configured to couple with a manifold assembly (152) of the runner system (150); and a biasing assembly (106) extending from the manifold extension (102), the biasing assembly (106) being configured to arrange, in use, sealing contact between the manifold extension (102) and a nozzle assembly (156).

Abstract: The optical scattering-based smoke detector comprises a scattering zone accessible to the smoke, a printed circuit forming a supporting member and a first and second light reflectors mounted on a common supporting member. An electronic smoke detection unit, a light emitter and a light receiver are mounted on the printed circuit. The receiver is sensitive to at least some of the wavelengths of the light rays emitted by the emitter. The first light reflector facing the emitter to direct the emitted light into a detection zone in the scattering zone. The second light reflector facing the receiver to direct, in the presence of smoke in the scattering zone, the scattered light from the detection zone onto the receiver. A single mechanical part comprises the first and second light reflectors and a link resistant to the passage of the light from the first light reflector to the second light reflector.

Abstract: The particle size distribution of a first fly ash is compared to an ideal particle size distribution that was empirically developed to provide a resin melt with a lower viscosity as more fly ash is added. A second fly ash material is similarly compared to the ideal curve and then is blended or optimized to provide an optimum filler for use with a suitable resin or similar material. Additional fly ash materials may be similarly compared and blended. Additional additives may be added for, among other things, foaming and coloration.

Abstract: A nozzle-tip insulator (100), comprising: a nozzle-contact surface (102); a mold-gate contact surface (104) being offset from the nozzle-contact surface (102); and a body (106) connecting the nozzle-contact surface (102) with the mold-gate contact surface (104), the body (106) being resiliently compressible, the body (106) defining a void formation (108), and the body (106) and the void formation (108) being coaxially concentrically positioned relative to each other.

Abstract: A lens array includes: at least one lens including a first lens surface and a second lens surface. The first lens surface is formed to tilt at a predetermined tilt angle with respect to the second lens surface. The first lens surface is formed to be eccentric by an eccentric distance in such a direction that the optical axis of the second lens surface and an optical axis of the first lens surface intersect on a side of the first lens surface.

Abstract: A sprue device for an injection mold includes a first part and a second part. The sprue device is sealed and water-cooled so as to reduce overall molding time. The connecting section defines spiral grooves. The second part includes a chassis and an extension from the chassis. The chassis is defined with a through hole, and two gates communicated with the through hole respectively. The spiral grooves mate with the wall of the mounting hole to form a spiral runner. The gates, the through hole, and the spiral runner communicate with each other. An injection mold using the sprue device is also described.

Abstract: An auxiliary injection unit is disclosed that has an extruder barrel and extruder screw integrated within an injection molding system. The extruder barrel and extruder screw are contained within a mold plate of the injection molding system with a drive mechanism of the auxiliary injection unit being external thereof. A melt stream emanating from the extruder barrel of the auxiliary injection unit is in selective fluid communication with either a melt channel of a manifold providing melt thereto during an injection cycle or with a discharge channel of a melt discharge tube for purging melt. A melt diverter component receives the melt stream from the extruder barrel and includes a shuttle valve slidably positioned therein that is operated to selectively divert the melt stream produced by the auxiliary injection unit to either the melt channel of the manifold or the discharge channel of the discharge tube.

Abstract: A hot-runner system (100), including (but not limited to): a mold insert (132) defining a mold gate (134); and a diamond-based component connected with the mold insert (132), the diamond-based component connected surrounding the mold gate (134).

Abstract: A color changing apparatus of an injection molding hot runner die which is simple in construction and easily capable of changing colors for molding products without removing and replacing a hot runner. In the apparatus, a passage for supplying a melted resin to a molding die, a divided type hot runner block is provided with hot runners each for exclusive use of each of molding colors, sprues and nozzles being in communication with the hot runners. A moving device is provided for moving the molding die, which is united with the divided type hot runner block, along with the divided type hot runner block. A positioning device is adapted to place the molding die in position in a state where either of the sprues of the divided type hot runner block is moved by the moving device to a position opposed to an injection nozzle for injecting the melted resin.

Abstract: Embodiments of the invention relate to injection mold components, assemblies, and molding system that include superhard materials. Such injection mold components, assemblies, and systems may decrease wear of certain injection mold components, which may result in improved productivity of the injection mold and molding systems that utilize such components.

Abstract: Representative embodiments provide for corresponding fluid atomizer bodies, each generally defining a fluidicly communicative interior cavity. The interior cavity is typically defined by an entry passageway portion, a chamber portion, a plurality of feeder passageways that are tangentially disposed to and fluidly coupled with the chamber portion, and an exit passageway portion fluidly coupled to the chamber portion. In one embodiment, an upper body portion and a lower body portion are bonded together to define a complete fluid atomizer body. Another embodiment provides for producing one or more fluid atomizer bodies by a way of injection molding.

Abstract: The invention relates to an interface device (1) between an injection tube (2) and a mold (3) provided with an injection hole (4), characterized in that the interface device (1) comprises a terminal element for an injection tube, comprising an end piece (5a, 5b) inserted into one end of the tube (2) and a sealing ring (6) that slides onto the tube, and a means (7, 8) for holding and clamping the terminal element. Said means (7, 8), which is to be screwed into a mounting (9) that is rigidly connected to the mold and is arranged around the injection hole (4), forms a seal between an injection end of the end piece and a sealing surface (10, 11) of the mold at the injection hole. The dismantlable assembly comprises a screw-on socket (7) that has a supporting surface (7a) for the sealing ring (6).

Abstract: A tensile stress is applied to solidified resin. The tensile stress is so small that the solidified resin formed in the sprue by solidification of molding material does not break and is so large that the solidified resin formed in the sprue is separated from the inner surface of the sprue due to a reduction in the diameter of the cross sectional area thereof. For the application of such a tensile stress, the runner stripper plate holding the solidified resin is moved away from the nozzle and sprue bushing. This state is maintained for a predetermined time to separate the solidified resin from the inner surface of the sprue.

Abstract: An improved sucker pin bushing for an injection mold is disclosed. In various preferred embodiments, the improved sucker pin bushing maintains much of the configuration of a conventional sucker pin bushing, namely a body portion and a head portion having a larger diameter than the body portion. A shoulder is formed where the body portion meets the head portion. However, the need for a jam screw or other retaining means is eliminated by the present invention by the inclusion of threads on the head portion of the bushing.

Abstract: An injection molding machine 1 includes mode selection means 8 that can selectively switch between a first control mode M1 and a second control mode M2. In the first control mode M1, control is performed by a first control system Cf in which a screw speed is controlled by feedback with a speed detection value Vd that is detected by screw speed detection means 5 and a speed target value Vfc, and an injection pressure is controlled by feedback with a pressure detection value Pid that is detected by injection pressure detection means 6 and a pressure target value Pic, whereas, in the second control mode M2, control is performed by a second control system Cs in which the screw speed is open-loop controlled with a speed target value Vsc, and a pump pressure is controlled by feedback with a pressure detection value Ppd that is detected by pump pressure detection means 7 and that is related to the pump pressure of the hydraulic pump 4 and a pressure target value Ppc.

Abstract: An injection-molding die including: a fixed die; a movable die; a cavity defined by the fixed die and the movable die; and a gate for injecting a melt resin into the cavity. The cavity includes: a flow-dividing structure that divides a flow of the melt resin injected into the cavity into a plurality of resin flows; and a flow-advancing area in which the resin flows generated by the flow-dividing structure are merged together. The flow-advancing area is formed thicker than a flow-hesitating area of the flow-advancing area in the cavity.

Abstract: A molding apparatus is configured with article molding regions that receive a direct flow of a molding material feed such that external flow channels are not needed. The article molding regions are formed into front sides of opposed “A” and “B” surface mold tools that, when moved into a mating relationship with one another, form closed molding cavities within which molded articles are generated from molding material feed. The article molding regions each generally have a body bounded by a perimeter that establishes an outer edge for an article molded in the one of the closed molding cavities. With at least the “A” surface mold tool, a port is coupled with the body of each article molding region to establish a direct pathway is through which the molding material feed flows to enter the article molding regions, and thus the closed molding cavity, without having to flow along the tool front sides outside of the article molding regions.

Abstract: Injection moulding tool for the manufacture of a plastic element sheathed with a sheet-metal shell (8), where the gate (12) which is designed as an integral part of the lower mould half (9) for correct positioning and supply of the plastic melt projects beyond the inner surface of the mould half (9) into the sheet-metal shell having a positioning opening (14), such that the plastic melt is discharged inside the sheet-metal shell and does not flow past it.

Abstract: A sprue bushing includes a head, and a main body. The main body is connected to an end of the head. The main body defines at least one lateral channel. The at least one lateral channel extends through a sidewall of the main body. The sprue bushing defines a sprue and at least two longitudinal channels. The sprue extends through the head and the main body along a center axis of the sprue bushing. The at least two longitudinal channels extend through the head into the main body. One of the at least one lateral channel communicates with two of the at least two longitudinal channels.

Abstract: Provided is an injection nozzle and a molding apparatus which ensure injection pressure by suppressing resin leakage even when a resin material having a low viscosity is used. In injection molding, it is especially important that the injection nozzle and a fixed die are excellently kept in contact with each other and that the resin is not leaked. Resin leakage from between the injection nozzle and the fixed die lowers molding pressure, increases molding shrinkage of the resin, and directly affects the qualities of a molded product resulting in generation of a sink, transfer failure and the like. Since an O-ring in a circumferential groove of the nozzle closely comes in contact with a concave spherical surface while elastically transforming on the entire circumference, leakage is effectively suppressed even the resin is a heat-curable resin having a low viscosity.

Abstract: Methods for forming a keyboard case are provided. A mold cavity configured to provide a keyboard case having a plurality of apertures disposed therethrough can be at least partially filled with a molten material. At least one runner can traverse at least a portion of the apertures forming the plurality of apertures. The molten material can be at least partially solidified within the mold cavity to provide the keyboard case. The keyboard case can be removed from the mold cavity and the at least one runner can be removed from at least a portion of the apertures forming the plurality of apertures.

Abstract: A purpose is to provide an optical component molding apparatus for producing a small-size and high-precision optical component and achieving good transferability and stability of a molded product. A multi-cavity molding machine 100 has a gate 51, a runner 52, and a sprue 53 each having the shape determined to meet conditions (1) to (5): (1) “Miminum gate thickness”/“Maximum runner thickness” is in a range of more than 0.2 to less than 1.0; (2) “Gate length”/“Maximum runner thickness” is in a range of more than 0.4 to less than 4.0; (3) “Outlet diameter of sprue” is in a range of more than 1.0 mm to less than 5.5 mm; (4) “Sprue length” is in a range of more than 10 mm to less than 40 mm; and (5) “Outlet diameter of sprue”/“Inlet diameter of sprue” is in a range of more than 1 to less than 8.

Abstract: A die and mold for manufacturing a mold product is provided. The die and mold includes a body having a cavity that has a shape corresponding to the mold product. The body includes an upper body plate, and a lower body plate facing the upper body plate and combined with the upper body plate. The die and mold also includes a gate. The gate includes an upper gate plate, a plurality of recesses formed on a lower surface of the upper gate plate, and a lower gate plate facing the upper gate plate. A plurality of protrusions is formed on an upper surface of the lower gate plate in a location corresponding to a location in which the plurality of recesses is formed. The gate also includes a resin injection portion through which a resin is injected into the cavity.

Abstract: The present invention concerns a transfer element (1, 9) for an injection molding system comprising a flow lumen for a plasticised plastic material. To provide a transfer element for an injection molding system, which makes it possible to further increase the material throughput of the injection molding system without having to tolerate increased wear of seals and other system components, it is proposed in accordance with the invention that it has a device for degassing of the flow lumen.

Abstract: A provisional rib portion is formed in a connected manner at a predetermined portion of a cavity to correspond to a provisional rib which is formed to project from a portion, of an injection-molded product, not serving as a design surface, and resin is injected for molding to the provisional rib portion via a gate. An end portion of the design surface of the injection-molded product is set on a parting line, and the provisional rib portion is formed in a connected manner, on a cavity surface along the parting line, by being sided to an inner side from the design surface, and a part or all on the design surface side of a connecting portion at which the provisional rib portion and the cavity are connected is formed in a curved shape.

Abstract: An injection molding machine includes a clamping unit constructed for support of at least two molding tools to provide at least two different cavities. A first plasticizing unit is provided for charging one of the cavities in one of the molding tools, and a second plasticizing unit is provided for charging the other one of the cavities in the other one of the molding tools. The second plasticizing unit is hereby attached to a mounting in a substantially vertical orientation. The mounting may be mounted on one of the platens of the injection molding machine or on a frame which extends above the clamping unit.

Abstract: The invention is directed to an injection unit, in particular for an injection molding machine, comprising a screw which is guided in a plastication cylinder in a rotatable and axially movable manner and via which plastic material undergoes plastication and can be injected into a tool cavity. The screw is driven via an electric drive including an electric motor and is operatively connected to a support cylinder having a pressure chamber to which dynamic and/or support pressure can be applied during plastication and injection. The electric motor is coupled to a hydrostatic machine which during plastication is driven by the pressure medium displaced from the pressure chamber and which during injection conveys pressure medium into the pressure chamber so as to build up support pressure.

Abstract: An injection molding device for thermosetting molding materials includes a male mold portion, and a female mold portion. The male mold portion includes an injection aperture and a sprue communicated with the injection aperture. The female mold portion is mated with the male mold portion to define a parting face therebetween and includes a cold slug well and a main runner. The cold slug well is disposed at an opposite end of the sprue relative to the injection aperture and has at least two inner sidewalls perpendicular to each other. The main runner is defined in the parting face and commutating with the sprue. The refractive index of the products molded using the injection molding device may be obtained via directly measuring that of the cold slug after molding. Therefore, the time spent to measure the refractive index of the products is less than the conventional method.