Abstract: An apparatus for the injection molding of plastic material, comprising a mold (7) into which molten plastic material is introduced, wherein there is provided a device for introducing liquid, in particular water, into the interior of the molten material, which includes a pump (3) driven by a motor (4), wherein the speed of rotation of the motor (4) and/or the stroke volume of the pump (3) is variable.

Abstract: An apparatus for slush molding a thin shell having an outer layer and an inner layer. The apparatus includes two tubs alternately movable to a cast position for dispensing their respective material contents into a mold cavity. According to another embodiment of the invention, the apparatus includes a diverter valve configured to alternately open a passage from each of two tubs to the mold cavity to selectively dispense charge materials from the respective tubs into the mold cavity. In addition, a method is provided for forming a thin shell having an outer layer and an inner layer. A first polymer material is cast and allowed to melt on a heated mold surface to form an outer layer. A second polymer material is then cast and allowed to melt and form an inner layer on the inner surface of the outer layer. The shell is then removed from the mold.

Abstract: An injection mold design system for correcting a profile of a product to be fabricated into a releasable profile from a mold to design an injection mold based on a corrected product shape, comprising storing information of product shape and mold profile, displaying the product shape or the mold profile on a screen based on the information read from the storing, inputting designation information necessary for correction of the product shape or the mold profile, and unloading information of lines or planes being obstructive to correction of the product shape and the mold profile into the storing in response to the designation information input removing the lines or the planes from the screen, and replotting the line or the planes on the screen in terms of the information of lines or planes unloaded into the storing after the correction operation of the product shape or the mold profile is completed.

Abstract: In a conventionally used injection molding apparatus, undried resin pellet is put in a drier of a predetermined temperature and water and gas in the undried resin pellet is completely removed, and the dried pellet deprived of water and gas is thrown into the injection molding apparatus. It is therefore necessary to carefully control quality of water and gas of pellet before pellet is thrown into the injection molding apparatus. In injection molding of undried resin pellet, evaluate injected resin, control operation conditions such as the feeding amount of pellet and the decompression degree, and determine the best operation conditions and the best accumulation amount wherein excellent articles are obtained. The accumulation amount of pellet fed in an injection molding chamber is detected, and feeding to the injection molding chamber is controlled upon the detection information.

Abstract: Components of a chemical processing system are disclosed. In particular, a chemical processing system is disclosed which includes a chemical mixing or reacting zone, an inlet to the zone, an outlet to the zone, and a vacuum or fluid flow source located downstream of the outlet. The chemical processing system further includes a device to control the amount of vacuum or fluid flow through the zone. Also disclosed is a continuous feeder system having a first loss-in-weight and a second loss-in-weight feeder and a device for measuring a lower limit of feed in each feeder. There is also a device to activate the second feeder when the lower limit is obtained in the first feeder and a device to deactivate the first feeder when the lower limit is detected in the first feeder. A sample port assembly is also disclosed for obtaining a sample of material flowing through a processing system.

Abstract: The process for forming ceramic tiles comprises depositing a layer of multi-coloured powdery material on a moving transport plane, in order to achieve a predetermined pattern, and subsequently transferring said layer internally of a moulding cavity, due to a movement of the transport plane and a contemporary displacement of the transport plane with respect to the cavity. The forming plant comprises a conveyor belt (2) able on command to perform displacements with respect to the forming cavity. A plurality of silk-screening devices (9) is predisposed to deposit a layer of powdery material bearing a predetermined design on the transport plane. The invention can be especially useful in the production of decorated vitrified stoneware tiles.

Abstract: A method for applying resin for forming a lens sheet comprises the steps (a) to (c). The step (a) is to apply ionizing radiation curing type resin in a form of liquid on an entirety of an upper surface of a forming die through a multiple nozzle to form a first uncured resin layer on the upper surface of the forming die. The step (b) is to apply the ionizing radiation curing type resin in the form of liquid on one side of the first uncured resin layer through a nozzle to form an uncured resin pool thereon. The step (c) is to spread the uncured resin pool from the one side of the first uncured resin layer toward the other side thereof to form a second uncured resin layer on the first uncured resin layer.

Abstract: An apparatus for manufacturing a lens sheet comprises an application device, a substrate supply device, a pressing device and an irradiation device. The application device applies ionizing radiation curing type resin in the form of liquid on the upper surface of a forming die for a lens sheet to form an uncured resin body on the upper surface of the forming die. The substrate supply device places a substrate on the uncured resin body. The pressing device presses the substrate against the uncured resin body to flatten the uncured resin body, so as to form a uncured resin layer, while spreading the uncured resin body to an outside periphery of the forming die. The irradiation device irradiates ionizing radiation on the uncured resin layer through the substrate to cure the uncured resin layer.

Abstract: A method for producing artificial marble having a stripe pattern comprising injecting liquid resins having different colors into a molding cell so that they are laminated to form two or more layers; then moving a comb-like tool through the laminated liquid resins while allowing the teeth to contact the bottom surface of the molding cell, then curing the liquid resins to form artificial marble, wherein, the comb-like tool is allowed to move through the liquid resins while the interval between teeth of the comb-like tool is allowed to vary. Artificial marble can be produced having a natural marble-like appearance in which the interval of stripe varies in a natural fashion or having a radial cut moire stripe pattern.

Abstract: An injection needle for use in a mold cavity of a gas-assisted injection molding machine. The injection needle includes a tubular member and a stem slidably disposed in the tubular member. The stem is positionable in a raised position and a retracted position. The injection needle further includes a central bore extending within the stem for supplying a gas and a slot. The slot is operable for relieving gas pressure within the mold cavity when the stem is in the retracted position.

Abstract: A multi-cavity coinjection mold and method for simultaneously producing a plurality of multi-layered articles comprising: a mold structure defining a plurality of mold cavities; a first supply source for supplying metered amounts of a first molding material; a second supply source for supplying metered amounts of a second molding material; a hot runner system in communication with the first and second supply sources for conveying the metered amounts of the first and the second materials separately to a region proximate each of the cavities; the region comprising having a pin controlled passage leading to proximate cavity by way of a gate having the same cross-section as the passage, the pin scavenging material from the passage and providing cavity packing.

Abstract: An apparatus for color blending an agglomerating flowable material from a differently colored individual batches, to mold a mottled heterogeneous product with material from at least two batches so that mottled products (i.e. with irregular arrangement of spots or confluent blotches of color) are produced from a relatively dry concrete mixture (zero slump concrete), which agglomerates into clumps that tumble randomly from individual hoppers containing individually colored concrete batches. By controlling positioning of a filling tray relative to a hopper outlet, the time sequencing and quantity of material released from each hopper outlet, it is possible to fill the filling tray in a large number of seemingly random mottled patterns where clumps of each of the individual colors remain visible in the molded product.

Abstract: A nozzle assembly branching each stream of at least two fluidized food materials of different colors into multiple streams, and guiding the multiple streams to predetermined locations in a mold, the nozzle assembly including: an upper nozzle plate, at least one lower nozzle plate positioned below and in contact with the upper nozzle plate, each of the upper and lower nozzle plates having at least two discrete passages, each of the passages in the upper nozzle plate guiding one of the food materials in a substantially horizontal direction, and having at least one communication port each in communication with corresponding one of the passages in the lower nozzle plate, each of the passages in the lower nozzle plate having at least one discharge port for discharging one of the food materials into one of the one or more unit cavities, at least one of the passages in the lower nozzle plate being a horizontal guide passage for guiding one of the food materials in a substantially horizontal direction.

Abstract: A tool for the injection molding of toothbrush bodies consisting of at least two different, consecutively injection molded plastic components, comprising a pair of mold parts that can be moved relative to each other and that together form groups of parallel mold cavities, wherein one of the mold parts for each group of mold cavities has a recess into which a mold insert can be filled, partial cavities are formed in the mold inserts, each corresponding to a head area of a toothbrush body, two of four groups of mold cavities form a first group pair in which the first plastic component is injection molded, two more of the four groups of the mold cavities form a second group pair in which the second plastic component is injection molded; the mold cavities in each group are parallel to each other and to those of the other group pair; one group of each pair of mold cavities is offset perpendicular to a lengthwise direction of the mold cavities with respect to the other group; the mold cavities of a group of each gr

Abstract: A method of making a new dental prosthetic from an existing dental prosthetic including the steps of providing an existing dental prosthetic; and providing a mold having a bottom half and a top half, the bottom half including a side wall, a closed bottom and an open top face for mating with the top half, the top half including a further side wall, an open bottom face for mating with the open top face of the bottom half, and a partially opened top. The bottom half is then partially filled with a first molding material, and a first portion of the existing denture of a first molded material. The top half of the mold is placed on the bottom half of the mold; and a portion of the first material and a further portion of the existing denture is covered with a second material. A mold for making a dental prosthetic includes a top half and a mating bottom half. The bottom half includes a side, an open top, and a substantially closed bottom.

Abstract: Molten resin material is continuously extruded from a first extruding hole extending in a width direction of a first extruding nozzle, and is passed through a second extruding nozzle which is arranged a front surface of the first extruding nozzle and has a second extruding hole at a position corresponding to the first extruding hole. The second extruding hole is a single extruding hole having a plurality of longitudinal rectangular openings arranged at the same pitch in the width direction, and a communicating section with which one end of the respective rectangular openings communicate, and the first extruding hole is a single extruding hole having coupling-element-molding openings arranged corresponding to the rectangular openings and a base-member-molding opening corresponding to the communicating section.

Abstract: A gas injection pin mechanism for introducing pressurized gas into a mold cavity or melt stream. A stationary pin member is positioned directly in a bore or opening in a mold member without a sleeve member. The pin member is an elongated body member with a first end facing a mold cavity and a first gas passageway through the pin member connected to a second passageway that is traverse to the first gas passageway. The second gas passageway has an opening on an exterior lateral surface of the pin member and gas through the second gas passageway is introduced into the cavity in annular space between the pin member and the mold opening.

Abstract: A printer forms three-dimensional objects from a powder by selectively applying a binder liquid to incremental layers of the powder. The binder binds layers of the powder into solid two-dimensional cross sections of the desired object provided from memory. The printer can use dithering and halftoning techniques to shade the object and can also print in color. A filtration system removes airborne powder and recirculates the clean air. The printer also includes additional features to manage excess and airborne powder.

Abstract: A molding system for use in producing a solidified article having a predetermined composite pattern formed of at least two kinds of viscous fluids distinct from each other in color, the system including: at least one discrete passage per each of the viscous fluids, and at least one discrete passage outlet per each of the viscous fluids separately guided through the at least one discrete passage, a method for producing the solidified article, an apparatus for producing the solidified article, and a method for producing the solidified articles.

Abstract: A gas injection moulding device with a mould cavity which communicates via a valve with spill chambers. The injection moulding process is controlled by a control unit so that the valve is first kept partially open during the injection of fluent plastic material for purging the mould cavity of air and for spilling a first small amount of plastic material to the spill chambers, whereas during the subsequent injection of gas, the valve is completely opened.

Abstract: In a die molding apparatus for molding resin articles having a plurality of molds for forming a cavity in communication with an injection gate and a gas charging nozzle capable of charging the inside of the cavity with a gas after the completion of resin injection to form a resin article having a hollow inside, an overflow portion for relieving an excess molten resin and a film gate for communication between the main cavity portion and the overflow portion are formed between a pair of molds forming the other end of the cavity, and the gap between both of molds is set to 1.

Abstract: An apparatus for injection molding two compatible polymeric materials, in which two substantially coaxial extrusion screws are used to plasticize the two materials into a common accumulation space. The charge comprising multiple layers of material is then injected into a closed mold by means of forward axial motion of the outer screw with respect to its enclosing barrel. Once inside the mold, the first material forms a skin layer totally or partially surrounding the other material. In this way a part having a plurality of material properties may be produced in a single operation.

Abstract: Trim panels for motorvehicles are manufactured by: injection molding a panel base portion having missing parts of predetermined area and shape, said molding involving the coinjection of a surface material and of an inner core material; separately producing a plurality of portions of panel having area and shape substantially corresponding to the missing parts and fastening said separately produced portions to said panels.

Abstract: A vent, system and method for controlling flow of fluid into and out of a mold cavity. The vent has a plurality of passages that each have narrow oblong slot-shaped openings in the mold cavity and which each expand in size in a direction leading away from its opening. The vent preferably is an insert that comprises a grate with at least a plurality of vent slots. The grate preferably is formed of two halves with fingers that interleave to form the slots when assembled. The grate preferably is discharge machined from disc-shaped blanks cut from elongate stock made a material that preferably is non-porous and smooth. The grate can be mounted in a pocket in the mold cavity or carried by a movable pin. A system uses valving and a source of fluid and, if needed, a source of vacuum to help facilitate venting by drawing atmosphere out of the cavity during molding. The system can also be used to introduce fluid through a vent such as for foaming moldable material in the cavity.

Abstract: An injection molding apparatus for injection molding a multi-layered article, which comprises; (a) a mold having a cavity block provided with a cavity and a hot runner block, (b) at least a first injection cylinder and a second injection cylinder, (c) a first resin-flow-passage for connecting an inside of the first injection cylinder and the cavity, and (d) a second resin-flow-passage for connecting an inside of the second injection cylinder and the cavity, the injection molding apparatus having a structure in which those portions of the first and second resin-flow-passages which are located within the mold are provided in the hot runner block, and the first resin-flow-passage and the second resin-flow-passage meet with each other in a junction portion upstream to a gate portion opened to the cavity, the injection molding apparatus being provided with back flow means for letting first molten resin in the first resin-flow-passage flow into the second resin-flow-passage after second molten resin is injected int

Abstract: A decorative food formed of a plurality of kinds of fluid food materials and manufactured by using a mold is provided. The decorative food has an outside shape thereof conforming to an interior surface of the mold inclusive of an opening of said mold. The decorative food has a colored pattern divided into multiple divisions extending up to a central portion of the decorative food, in a direction to extrude the food materials into the mold, the colored pattern being formed such that the multiple divisions are arranged with substantially the same ratio at any of a cross sectional area intersecting the direction to extrude the food materials, and wherein the decorative food contains therein a foodstuff. Also disclosed are an apparatus and method for manufacturing the decorative food.

Abstract: At least one mold is provided having a mold cavity and a mold gate communicating with the mold cavity, an injection nozzle for feeding molten plastic material to the injection mold having a nozzle outlet in line with the mold gate, and a thin movable valve gating arrangement positioned between the mold gate and nozzle outlet having an orifice therein permitting and shutting off flow of molten plastic from the nozzle to the mold.

Abstract: A nozzle having an internally threaded bore communicating through a mold body with a source of a pressurized gas, and an externally threaded pin received within and engaging the threaded bore. The pin has a machined longitudinal surface creating an air passage through the bore when the pin is in place. At the outlet end of the nozzle the pin carries one or more washers having air passages machined therein.

Abstract: Method and apparatus for manufacturing a synthetic resin-made hollow member incorporating an intermediate element are provided which enable operations of molding half bodies, abutting and joining the half bodies together, and molding an intermediate element in a series of steps, and which eliminate the necessity of such a manual work as may otherwise be required in incorporating the intermediate element into the half bodies. A pair of rotary injection molding dies are used which can be opened and closed relative to each other and are rotatable relative to each other over an angle of 60° for each turn, each die having a half body molding section including one male molding portion and two female molding portions in the direction of rotation for each rotational run over an angle of 120°, each die also having an intermediate element molding portion provided between specified half body molding portions in the direction of each rotational run over an angle of 120°.

Abstract: Method and apparatus for manufacturing a synthetic resin-made hollow member incorporating an intermediate element are provided which enable operations of molding half bodies, abutting and joining the half bodies together, and molding an intermediate element in a series of steps, and which eliminate the necessity of such a manual work as may otherwise be required in incorporating the intermediate element into the half bodies. A pair of rotary injection molding dies are used which can be opened and closed relative to each other and are rotatable relative to each other over an angle of 60° for each turn, each die having a half body molding section including one male molding portion and two female molding portions in the direction of rotation for each rotational run over an angle of 120°, each die also having an intermediate element molding portion provided between specified half body molding portions in the direction of each rotational run over an angle of 120°.

Abstract: Sprue gated injection molding apparatus for molding preforms or other products having two layers of a barrier material such as EVOH or nylon alternating between three layers of another thermal plastic material such as PET. The PET is injected by one injection cylinder into first and third melt passages which branch in a front melt distribution manifold to extend to a number of heated nozzles. The first melt passage extends through a central melt channel in each heated nozzle and the third melt passage extends through an outer annular melt channel surrounding the central melt passage to an aligned gate leading to a cavity. The barrier material is injected by another injection cylinder into a second melt passage which branches in a rear melt distribution manifold to extend to an inner annular melt channel extending between the central melt passage and the outer annular melt channel in each heated nozzle.

Abstract: A multi-layered article having a first portion constituted of laminated three resin layers and a second portion extending from the first portion, the first portion being constituted mainly of consecutively laminated resin layers composed of a first resin layer formed of a first resin, a second resin layer formed mainly of a second resin and a third resin layer formed of the first resin, the second portion being constituted of resin layers extending from the first resin layer and the third resin layer which constitute the first portion, the first resin layer constituting the outer surface layer of the multi-layered article, the third resin layer constituting the inner surface layer of the multi-layered article which inner surface layer is opposed to said outer surface layer, the second resin layer being encapsulated with the first resin layer and the third resin layer, the second resin layer having a thickness which decreases towards the second portion, and being discontinued, in a region of the first portion

Abstract: A method for producing artificial marble having a stripe pattern comprising injecting liquid resins having different colors into a molding cell so that they are laminated to form two or more layers, then moving a comb-like tool through the laminated liquid resins while allowing the teeth to contact the bottom surface of the molding cell, then curing the liquid resins to form artificial marble, wherein, the comb-like tool is allowed to move through the liquid resins while the interval between teeth of the comb-like tool is allowed to vary. Artificial marble can be produced having a natural marble-like appearance in which the interval of stripe varies in a natural fashion or having a radial cut moire stripe pattern.

Abstract: A method for manufacturing a keypad, where the key of the keypad has a key body and a three-dimensional character; the manufacturing method utilizes the female mold corresponding to the key and the male mold having three-dimensional character. The light-colored transparent material is made for key body with reserved space for three-dimensional character. The female mold having the key body is then combined with the another male mode. The dark-colored material is injected into the reserved space of the key body to form the three-dimensional character in the key body. Applying the color contrast between the textures of the key body and three-dimensional character, it enables to display the three-dimensional character shown in the key body.

Abstract: An injection nozzle device including multi-polymer injection nozzles comprising an assembly of shells, and having fixed, tapered passageways communicating with annular orifices close to a nozzle gate and to each other, and polymer flow balancing and directing means in the passageways in the form of concentric and eccentric chokes.

Abstract: An injection-molding apparatus comprises;

Abstract: A plastic part having a complex structure as a first layer and a simple structure as a second layer, is formed using a method for molding. Initially, a single mold is provided, the mold having an interior cavity and a runner reaching from an exterior of the mold to the cavity. The mold is kept closed while a quantity of a first plastic material is injected via the runner into the interior cavity to form a first layer of the plastic part. The mold is then partially opened, creating an increased interior cavity section, into which a quantity of a second plastic material is injected, via the runner, to form a second layer of the plastic part. The solidified plastic part can then be ejected from the mold.

Abstract: An apparatus having a single screw extruder and a twin screw extruder. The extruders are designed to operate intermittently in a batch-type process. The single screw extruder contains a plurality of barrel segments with an internal cavity, an inlet and a transfer die located at an outlet. The barrel segments provide processing flexibility in that the L/D ratio of the single screw extruder can be varied to accommodate various materials, fillers and material throughputs. The twin screw extruder includes a body having an internal cavity disposed therein. The body includes an inlet at a first end, an outlet at a second end and an inlet located along the length of the twin screw extruder to accept fiber material (fibers) from a side stuffer. A transfer valve is connected to the outlet of the twin screw extruder. The transfer valve controls the flow of melt from the twin screw extruder into an injection plunger.

Abstract: An injection molding apparatus for injection molding a multi-layered article is disclosed. The apparatus comprises; (a) a mold having a cavity block provided with a cavity and a hot runner block, (b) at least a first injection cylinder and a second injection cylinder, (c) a first resin-flow-passage for connecting an inside of the first injection cylinder and the cavity, and (d) a second resin-flow-passage for connecting an inside of the second injection cylinder and the cavity. The injection molding apparatus has a structure in which those portions of the first and second resin-flow-passages which are located within the mold are provided in the hot runner block, and the first resin-flow-passage and the second resin-flow-passage meet with each other in a junction portion upstream to a gate portion opened to the cavity.

Abstract: Disclosed is a gas injection mold structure for use in the field of gas auxiliary injection molding, comprising a male mold and a gas injection device. The gas injection device includes a head and a cylindrical body extending from the head. The male mold is formed with a cylindrical cell. The cylindrical body has an outer periphery and the cylindrical cell has an inner wall being formed with matching outer and internal threads, respectively, such that the gas injection device is removably threaded into and affixed to the cylindrical cell by means of the cylindrical body. The cylindrical body is formed with a plurality of vertical grooves along an entire length of sides thereof.

Abstract: A strip casting device (2) has a casting container (14) from which through a casting gap (15) two different masses (12, 13) of a material flowable with the addition of heat are poured out as a strip (3) onto a cooling device (4). The second mass (13) is at the same time ejected by way of injection nozzles (21, 22) into the region of the casting gap (15) into the casting flow of the first mass (12). The injection nozzles are preferably movable in various directions.

Abstract: A method and apparatus for gas assist compression molding of fiber reinforced plastic parts.

Abstract: A tool for injection molding of toothbrush bodies of two different plastics components comprises two mold parts which can be moved relative to each other and together constitute four groups of parallel mold cavities. One of the mold parts has a recess for each group of mold cavities. A mold insert fits into the recess. Partial cavities are formed in the mold inserts, which partial cavities each correspond to a head portion of a toothbrush body. A first plastics component is injected into a first pair of groups of the mold cavities and a second plastics component is injected into a second pair of groups of the mold cavities. The mold cavities of the first pair of groups are arranged on the one side and those of the second group are arranged on the other side of a rotatable carrier arm to which the mold inserts are fastened. The mold cavities are arranged in each group parallel to each other and so as to have the same orientation.

Abstract: An apparatus for forming a nonwoven fibrous web wherein the web contains at least one binder fiber and at least one support fiber. The apparatus comprises a mixer for creating a homogeneous mixture of the fibers, a conveyor for transporting the resulting fiber mixture to a shaker chute, an oscillating mechanism which acts on the fiber mixture, a depositing mechanism for depositing the fiber mixture onto a horizontal planar surface, a heater for heating the mixture to a temperature to fuse the binder and support fibers, and a cooling mechanism to cool the mixture after heating.

Abstract: A plastic article is formed in an injection mold by injecting molten plastic into the injection mold at an elevated temperature, cooling the plastic from the molten condition to a solid condition, and crystallizing a portion of the plastic by slowing down the cooling of said portion.

Abstract: A molding system for use in producing a solidified article having a predetermined composite pattern formed of at least two kinds of viscous fluids distinct from each other in color, the system including: at least one discrete passage per each of the viscous fluids, and at least one discrete passage outlet per each of the viscous fluids separately guided through the at least one discrete passage, a method for producing the solidified article, an apparatus for producing the solidified article, and a method for producing the solidified articles.

Abstract: A plastic article is formed in an injection mold by injecting molten plastic into the injection mold at an elevated temperature, cooling the plastic from the molten condition to a solid condition, and crystallizing a portion of the plastic by slowing down the cooling of said portion.

Abstract: Valve gated multi-cavity injection molding apparatus for five layer molding having actuating mechanisms for reciprocating elongated valve members between four different positions. Each actuating mechanism has a front and a rear aligned cylinders, a first piston connected to the head of one of the valve members in the front cylinder and second and third pistons in the rear cylinder. The third piston has a stem portion which extends forwardly through the second piston into the front cylinder. Hydraulic pressure from four hydraulic lines connected to each actuating mechanism reciprocates each elongated valve member between the different positions. In the first closed position, the front end of the valve member is seated in the gate. In the second position, the front end of the valve member is retracted sufficiently to allow an initial amount of PET to flow from an outer annular melt channel through the gate.

Abstract: Multi-cavity injection molding apparatus for three layer molding having elongated pins for fixed pin gating or valve gating. Each elongated pin has a central melt bore extending rearwardly from its front end to a number of laterally extending bores. A low viscosity barrier material such as EVOH or nylon flows through these bores to the gate leading to the cavity. This allows coinjection with fixed pins and sprue gating in one embodiment and by valve gating in another embodiment.

Abstract: A method and apparatus for molding plastic articles in two colors, particularly, the bodies of magnetic tape cassettes, in which a strong bonding force is provided between the two portions without having to form a recess and projection on the joining edges of the two portions. A slide core, which is moved in and out of a primary mold cavity between the mold of the two portions of the article, is provided with a tubular passage having an opening within the primary mold cavity along edge portions of the slide core. The slide core is fully inserted into the primary mold cavity to mold the first portion, then partially withdrawn to form a seconary mold cavity in which the second portion is subsequently molded. After molding the first portion, an adhesive is injected through the tubular passage along the edges of the first portion which will join corresponding edges of the second portion to thereby firmly join the two portions.