Abstract: An injection molding apparatus is provided in which the rate of material flow during the injection cycle is controlled. According to one preferred embodiment, a method is provided for use in an injection molding apparatus including a hot runner assembly comprising a manifold and at least first and second injection nozzles, the hot runner assembly to direct material injected into said manifold through said at least first and second injection nozzles through a corresponding at least first and second gates to one or more mold cavities. The method includes the steps of injecting material into the manifold, controlling, in the hot runner away from the first gate, a first rate at which material is injected through the first gate, and controlling, in the hot runner away from the second gate, a second rate at which material is injected through the second gate, independently from the first rate.

Abstract: A shooting pot actuator for an injection molding machine having two plates carrying pusher rods for pushing against injection plungers within the shooting pots. The plates are mounted outside the mold and the clamp unit, and the pushers extend through bores in the stationary platen of the clamp unit to reach the injection plungers. The actuator reduces the cost and complication of mold design and production, and permits simplified adjustment of the injection plunger stroke.

Abstract: The present invention relates to a method and an apparatus for producing a toothbrush comprising a handle and a brush head provided with a plurality of bristle bundles. A basic body of a brush head is produced preferably from a hard component in an injection-moulding means, the bristle bundles being embedded at their ends in bristle-bundle holding sections which are connected by bridge portions. These bridge portions are cut through and the basic body of the brush head is encompassed preferably with a soft component by injection moulding.

Abstract: A method and apparatus for producing a contact lens material having two opposite lens-forming surfaces is disclosed. A first resin mold having a molding surface providing one of the opposite lens-forming surfaces of the contact lens material is injection-molded by closing a first and a second die to define at least one mold cavity and injecting a resin material into the mold cavity. A second resin mold having a molding surface is injection-molded by closing a third and a fourth die to define at least one mold cavity and injecting a resin material into the second mold cavity. The dies are separate away from each other and molding material is introduced into one of the resin molds which are held on one of the respective dies. The dies holding the first and second resin molds are moved relative to each other to assemble the first and second resin molds to define a mold cavity for the contact lens material.

Abstract: Multilayer products, such as vehicle trim panels, provided with an external skin layer and an internal core layer are co-injection molded by injecting external material (P) through a first plurality of points of injection (3a-3c) and injecting the core material (C) through a second plurality of points of injection (4a-4g), the points and nozzles of injection of one material being physically distinct from those of the other material.

Abstract: A process for formation of a plastic composite includes providing a two part mold system wherein one of the parts is moveable and includes cavities and the other of the parts is stationary and includes cores each having less mass and sequentially moving the moveable mold part with respect to the stationary mold part to form an injection volume between each of said mold cavities of variable capacity.

Abstract: A runner system and runner component particularly adapted for use in multiple cavity injection molding systems is disclosed. The runner system and runner component utilize particular structural features and geometrical configurations that have been found to result in superior molding practices and molded components in multiple cavity injection molding systems. A corresponding multiple cavity injection molding system utilizing the noted runner system is described. And, a related method for promoting uniform filling of multiple mold cavities is also disclosed.

Abstract: An injection molding apparatus and method are provided in which the rate of material flow during an injection cycle is controlled. According to one preferred embodiment, an injection molding apparatus is provided that includes a manifold, at least one injection nozzle coupled to the manifold, an actuator, and a valve pin adapted to reciprocate through the manifold and the injection nozzle. The valve pin has a first end coupled to the actuator, a second end that closes the gate in a forward position, and a control surface intermediate said first and second ends for adjusting the rate of material flow during an injection cycle. Retracting the valve pin tends to decrease the rate of material flow during the injection cycle and displacing the valve pin toward the gate tends to increase the rate of material flow during the injection cycle.

Abstract: A melt transfer system is provided for a stack mold. The melt transfer system includes first and second transfer bushings arranged in opposing platens of the mold. Each transfer bushing defines a portion of a runner passage communicating at shear gates disposed in a shearing surface that is parallel to the direction of opening and closing movement for said platens in order to shear the melt when the platens are moving from a closed position to an open position. In another aspect, the shearing surfaces are normal to the direction of movement of the platens and at least one of the transfer bushings is rotatable relative to the platen for shearing the melt. In another aspect, a transfer bushing is provided having a core formed of an insulative material and a shell formed of a conductive material. The core defines a channel for conducting melt between a shear gate at one end of the channel and an aperture at another end of the channel.

Abstract: The inventive axis or roller body on the basis of at least one first thermoplastic material which is processable in an injection molding process, which incorporates the respective desired qualities, whereby this axis or this roller body

Abstract: A process produces a resin intake member by injection moling. The intake member has a hollow generally cylindrical main section and a subsidiary section integrally connected to an outer periphery of the hollow main section. The process includes a primary molding step which forms the hollow main section in a primary molding die and a secondary molding step which subsequently inserts the formed hollow main section into a secondary molding die to integrally form the subsidiary section with the hollow main section in the secondary molding die.

Abstract: The subject of the present application is an auxiliary injection unit (1) for fitting to a first mould (9) for injection moulding a first component of plastics material articles, having at least one connection (3) in one side for the injection of a second component.

Abstract: A runner system and runner component particularly adapted for use in multiple cavity injection molding systems is disclosed. The runner system and runner component utilize particular structural features and geometrical configurations that have been found to result in superior molding practices and molded components in multiple cavity injection molding systems. A corresponding multiple cavity injection molding system utilizing the noted runner system is described. And, a related method for promoting uniform filling of multiple mold cavities is also disclosed.

Abstract: A method for fabricating a seal-integrated separator for a fuel cell is presented, with which seals can be accurately positioned and the assembling time for the fuel cell units may be greatly reduced.

Abstract: An apparatus and method for injection molding includes a first melt passage for the flow of a first material, and a second melt passage in communication with the first melt passage for the flow of a second material. The apparatus and method for injection molding also includes a valve pin that passes through the second melt passage. The valve pin has a first portion allowing the flow of the second material, but not the first material, through the second melt passage, and a second portion restricting the flow of the first material and the second material through the second melt passage. The valve pin may also be used to restrict material flow from a melt channel into a cavity. In addition, a back-flow control valve may be combined with a melt passage of the apparatus and method for injection molding. The back-flow control valve has a first portion for permitting flow of material through the melt passage, and a second portion for restricting flow of material through the melt passage.

Abstract: Disclosed are novel molding methods for injection molding thermoplastic lens elements and particularly adapted for the manufacture of steeply curved and/or thin-centered lenses.

Abstract: A golf club head has a weight compartment within a hollow interior, and a weight member that is injected into the weight compartment subsequent to formation of the body of the golf club head. The preferred weight member is bismuth. The golf club head has a body that has a volume between 140 cubic centimeters and 350 cubic centimeters. The body of the golf club head weighs between 140 grams and 215 grams.

Abstract: An injection molding apparatus is provided in which the rate of material flow during the injection cycle is controlled. According to one preferred embodiment, a method is provided for use in an injection molding apparatus including a hot runner assembly comprising a manifold and at least first and second injection nozzles, the hot runner assembly to direct material injected into said manifold through said at least first and second injection nozzles through a corresponding at least first and second gates to one or more mold cavities. The method includes the steps of injecting material into the manifold, controlling, in the hot runner away from the first gate, a first rate at which material is injected through the first gate, and controlling, in the hot runner away from the second gate, a second rate at which material is injected through the second gate, independently from the first rate.

Abstract: The present invention comprises a method for delivering a medium such as a gas, vapor or liquid into a melted plastic in a mold via an elongated screw shaft rotatably supported in a housing, the method including the steps of providing the screw shaft with a bore longitudinally therethrough from a proximal end to a distal tip end thereof, rotating the screw shaft in the housing to move plastic therethrough, and into the mold, introducing a gas, vapor or liquid into the bore, to permit the gas, vapor or liquid to be delivered through the bore, and into the molten plastic in the mold through the distal tip end of the screw shaft.

Abstract: The present disclosure describes a process and an apparatus for delivery of plastic at a viscosity and in the required quantity suitable for compression molding of large, and often odd shaped three-dimensional products, such as large automotive body parts and large appliance parts, etc. These products may consist of plastic only, or may require additional layers of other plastics or even other materials such as woven cloth, inserted into the cavity before molding. The purpose of this invention is to provide a process and apparatus for use with a compression molding machine to supply plastic to a mold cavity, at a number of suitable locations, and in appropriate quantity at each location as required by product shape and thickness. The apparatus and process includes a delivery head which is mounted on rails attached to the machine clamp or the mold cavity, and a connection between the injection unit of the molding machine.

Abstract: Method and apparatus for making multilayer injection molded plastic articles. In one embodiment, a relatively thin inner sleeve layer is molded in a first mold cavity on a core, the first mold cavity being heated to maintain an outer surface of the inner sleeve layer at an elevated temperature, and the core and sleeve layer are transferred to a second mold cavity to mold a relatively thick outer layer over the sleeve layer while the outer surface is at the elevated temperature, where the elevated temperature is selected to provide melt adhesion between the inner sleeve and the outer layer during the second molding step. In another embodiment, a method of injection molding is provided in which a first thermoplastic material is used to form a first preform portion having an average percent crystallinity of at least about 30%, and a second thermoplastic material is injection molded to form a second preform portion which remains substantially amorphous.

Abstract: The invention relates to a process for manufacturing injection moulded objects of thermoplastic material by injecting molten thermoplastic material into a mould from at least two distinct injection points whereas the flows of molten material from each injection point each fill part of the mould and flow together to fill the entire mould while still in molten state, wherein objects having a size of more than 80 cm along each of its three dimensional axes are produced by providing at least two distinct injection points at opposite sides of the mould. The invention also relates to injection moulding equipment for the manufacture of moulded objects of thermoplastic material, comprising at least two distinct injection points provided at opposite sides of a single mould assembly. The invention further also relates to three dimensional moulded objects of thermoplastic material having a size of more than 80 cm along each of its three dimensional axes.

Abstract: A method of producing an injection molded part in which an insert is disposed within a mold cavity and extrusion coated with a plastic material fed via injection cylinder by layering at least one hard component and at least one soft component of a plastic material within the injection cylinder and then successively feeding the hard component followed by the soft component out of the injection cylinder into the mold cavity to extrusion coat the insert.

Abstract: A container (10) for housing a waste receptacle (81, 82) includes a base member (11) formed by joining two identical base halves (20, 21). Two interchangeable side walls (12, 13) are attached to the base member (11) and include extensions (16, 17) which form the top (18) of the container (10). Interchangeable front and back walls (14, 15) are provided, the front wall (14) acting as a door and being hingedly attached to one of the side walls (12), and the back wall (15) being attached between the side walls (12, 13). If the waste receptacle is in the form of a plastic bag (82), it may be carried by frame (83) which is moveably mounted on tracks (41) carried by the side walls (12, 13). The container (10) may be manufactured simply by molding the identical parts and connecting them as described.

Abstract: A method and apparatus for controlling injection in an injection molding machine meters and controls injection shot. Injection shot is metered into a heating cylinder of the injection molding machine, and the injection shot is then injected into a mold by advancing an injection screw in an injection direction within the heating cylinder. The injection screw is then retracted within the heating cylinder.

Abstract: A method of producing a partially covered panel comprising a series of manufacturing steps. A covering is formed to have a perimeter portion. The covering is generally formed using a thermoforming operation. The perimeter portion is formed into a flange-shape. A mold movable between open and closed position is moved to an open position. The mold includes a first and second surface. The covering is placed juxtaposed the first surface. A retainer is extended to retain the covering in position prior to and during the molding operation. The retainer engages the perimeter flange portion of the covering. The mold is moved to the closed position. The retainer, covering and first surface define a first cavity section. A first quantity of molten plastic is injected under pressure into this first cavity section. The molten plastic pushes the flange portion against the retainer and the retainer prevents the seepage of plastic between the first surface and the covering.

Abstract: A method and an apparatus for injection-molding plastic material articles, in particular articles consisting of a plurality of components, are disclosed. An injection molding machine has a mold, e.g. a stack mold. The mold is adapted to be temperature-controlled differently in different areas of the mold. A center platen of the stack mold on a first side thereof cooperates with a first mold portion via a first separation plane and, on a second side thereof cooperates with a second mold portion via a second separation plane. The stack mold is provided with a plurality of first, smaller cavities as well as with a plurality of second, larger cavities. Means are provided for injection-molding the first components of the plastic material article in first cavities located in the first separation plane and injection-molding the second components on the first components within the second cavities.

Abstract: Oxygen scavenging barrier polyamide compositions exhibiting high oxygen scavenging capability as well as good coinjection stretch blow moldability characteristics suitable for making multilayer PET bottles with good clarity and delamination resistance are claimed in this invention. The polyamide compositions of this invention comprise a slow crystallizing polyamide blend comprising (i) an amorphous, semiaromatic polyamide homopolymer, copolymer or mixture thereof and (ii) a semicrystalline, aliphatic polyamide homopolymer, copolymer or mixture thereof wherein in the weight ratio of (i):(ii) ranges from about 99:1 to about 30:70; at least one polyamide-compatible, oxidizable polydiene; and at least one oxidation promoting metal salt catalyst. The multilayer PET bottles, made with the polyamide compositions of this invention as the barrier layer, are suitable for extended shelf-life packaging of oxygen-sensitive food and beverage products such as beer and juices.

Abstract: The present invention relates to a sprue bar assembly for use with a number of different injection molding machines. The sprue bar assembly comprises a fixed sprue bar section having a first channel through which molten material, such as a plastic resin, flows. The first channel communicates with the outlet of a source of the molten material. The sprue bar assembly further comprises an adjustable sprue bar section having a second channel through which molten material flows and a powered unit for holding the adjustable sprue bar section in contact with the fixed sprue bar section so that molten material can flow from the first channel to the second channel without leaking and for changing the length of the sprue bar assembly as needed to accommodate molds of different shutheights.

Abstract: An assembly is provided comprising a container and a break-off closure made of plastic. The container comprises a surface with a passage opening, which opening is sealed by the break-off closure An attachment area is provided between the break-off closure and the surface of the container, which area is situated around and at a distance from the circumference of the passage opening. The attachment being obtained by heating the attachment surface of one of the container and break-off closure to such a temperature that a breakable attachment is formed between them.

Abstract: A hoop metal lead frame (1) having, solid electrolytic capacitor elements (5) on its terminal sections (2) is provided with a crosspiece (3) bridging both sides in terms of the width direction disposed along the length direction in a region between the capacitor elements (5), one crosspiece for two capacitor elements (5). The metal lead frame (1) is placed on a molding die so that the region without having the crosspiece is locating at the sub runner (8), which has branched out from the main runner (7). The capacitor elements (5) are encapsulated with a molding resin injected through the sub runner (8). Since the molding resin is not covering the crosspiece (3), the main runner portion (7) and the sub runner portion (8) can be severed from the metal lead frame (1) without effecting unwanted stress on the solid electrolytic capacitors (10). The solid electrolytic capacitors (10) thus manufactured have a superior property in the tight hermetic sealing.

Abstract: A method of injection molding material around the surface of an object. The method involves positioning the object within the cavity of a first mold and holding the object through the use of a plurality of clamping mechanisms. Material is injection molded about the surface of the object such that the material encompasses the object's surface except for points of contact between the clamping mechanisms and the object. A plurality of protrusions, formed of injection molded material and extending outwardly from the surface of the object, are formed during the injection molding process. Thereafter the object is removed from the first mold cavity and positioned within the cavity of a second mold. The object is secured within the second mold cavity through engagement of the outwardly extending protrusions with the second mold.

Abstract: The present invention relates to a method and an apparatus for producing a toothbrush comprising a handle and a brush head provided with a plurality of bristle bundles. A basic body of a brush head is produced preferably from a hard component in an injection-moulding means, the bristle bundles being embedded at their ends in bristle-bundle holding sections which are connected by bridge portions. These bridge portions are cut through and the basic body of the brush head is encompassed preferably with a soft component by injection moulding.

Abstract: A template is placed over a mold cavity, with the template including a series of orifices which extend over substantially the entire surface of the mold cavity. Molten plastic is passed through the orifices in a pattern corresponding to the shape of the article to be molded, and the molten plastic is formed into a molded article having the shape of the mold cavity.

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: A multi-color injection molding process for producing an ink-jet printer member having a plastic substrate and an elastic material layer that are integrally composited, by melt-injecting into a mold in turn, a material for a plastic substrate and an elastic material composed of a thermoplastic elastomer. The above process is well suited for the production of the ink-jet printer member such as an ink tank valve for supplying a recording head with an ink to be filled in an ink chamber, also of a sealing member which is installed at an ink supply port or on the main body of an ink-jet printer and prevents an ink from leaking through the ink supply port or through the recording head.

Abstract: A connector and tubing assembly including a multi-lumen molded connector having at least three flexible tubes also molded into the connector. The connector may be “Y” shaped and include three flexible tubes. A process of making the connector and tubing assembly involves forming a first part of the connector with two tubes molded therein and then removing an internal mold member prior to molding the final connector portion and third tube in place.

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: An injection molding apparatus for molding a plastic article by fitting an upper mold and a lower mold by pressing and injecting a molten resin through a pin point gate employs a net groove formed at the upper mold and/or the lower mold, said net groove comprising fine grooves extending in a vertical and/or horizontal directions. A passage groove formed on the net groove of the upper and/or lower molds has a large diameter or width to facilitate the entrance of the molten resin. At least one pin point gate is formed on the passage groove to inject the molten resin into the mold. A frame groove surrounds the net groove in the upper and/or lower molds.

Abstract: A method of manufacturing traverse ribbed troughs of thermoplastic resin material comprises the following steps. A length of trough is injection molded in a mold cavity between male and female molds, the mold cavity being configured to form integral raised traversing ribs on the outer surface of the trough and a plurality of spaced extensions at an end. The injection molding is cooled to initiate setting of the resin/composition, the male and female molds are disengaged and a partially set resin/composition trough length is ejected. The male and female molds are re-engaged, with extension containing end of the formed trough participating in closing an open end of the mold cavity. Further resin/composition is injected into the cavity which forms a homogeneous continuum with the partially set extension containing end of the trough end which participated in closing, forming a continuing trough length, steps being repeated until the desired length of trough is formed.

Abstract: A method for making an oral brush body using an injection molding apparatus includes injecting polymer into a mold cavity at a pressure no greater than about 250 psi and in an amount sufficient to fill the cavity. The injection molding apparatus includes a mold that includes a cavity defining at least a portion of an oral brush body, and an injection unit in communication with the cavity and capable of injecting a polymer into the mold cavity at a pressure no greater than about 250 psi and in an amount sufficient to fill the cavity.

Abstract: A technique for fabricating an improved electronic enclosure. The electronic enclosure is made of graphite fibers dispersed directionally (non-homogeneous) in an absolac/polycarbonate (ABS/PC) resin mix, which the composition is molded to form the plastic enclosure. The graphite concentration is highest along the interior surface of the enclosure to provide improved heat transfer, as well as adequate EMI/RFI shielding. However, the graphite concentration decrease along the thickness, wherein at the outer surface, the graphite concentration level is zero. The directional variation in the graphite loading allows high graphite loading at the interior surface of the enclosure, but retains lower loading at other regions along the thickness so that rigidity and impact resistance are retained for the enclosure.

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: An injection molding apparatus is provided for controlling the rate of material flow into a mold cavity or plurality of mold cavities during an injection cycle. The apparatus is, for example, a hot runner system for injecting plastic melt. A valve pin is provided for controlling the flow of material away from the gate. A gap is formed between the surface of the valve pin and the surface of the material flow bore away from the gate. Control of material flow is achieved by displacing the valve pin and thereby adjusting the size of the gap. A control system is provided that compares a sensed condition indicative of the rate of material flow into the mold cavity to a target profile of the sensed condition, and adjusts the valve pin during the injection cycle to mirror the target profile.

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: 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 drool control apparatus having a piston disposed in a melt passage of a mold. The piston is moveable between a bypass position, where pressurised melt is permitted to flow past the piston to at least one nozzle, and a compression position, where the melt downstream of the piston is decompressed to inhibit drool at the nozzle.

Abstract: A method of making a water shield for a motor vehicle. The method comprises providing a mold having a cavity with the general shape of the water shield and also having a movable core. A first plastic is injected into the cavity to form a substrate of the water shield. The core is withdrawn, and a second plastic is injected into the mold in proximate the first plastic to form a gasket of the water shield. The plastics are cooled to form the substrate having a first durometer and to form the gasket having a second durometer softer than the first durometer.

Abstract: This invention relates to a mold design, injection molding machine and a method for forming a multi-layer plastic article by over molding where the second layer of the article includes a portion having a different geometrical profile than the first one. The novel injection mold and injection molding machine for producing over-molded articles comprises an array of one or more cores which engage arrays of one or more first cavity and arrays of one or more composite cavities. Each composite cavity is formed from the combination of a second cavity and a cavity extension which carries at least a portion of the different geometrical profile, such as a thread. In one embodiment, the cavity extension comprises a pair of cavity portions which are mounted adjacent the core to laterally moveable slides on a movable plate, that can be a stripper plate.

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