Abstract: Apparatus for coinjecting a plurality of thermoplastic materials to mold an article having a layered wall structure using thermoplastic material having different optimum processing temperatures including the maintenance of the optimum temperatures in flow paths individual to each material from its source to a mold cavity.

Abstract: The apparatus of the present invention involves transferring plastic parisons from a receiving station to a finishing station on a plurality of pallets in a single row for forming said parisons into hollow plastic articles. The pallets with parisons thereon are transported through a temperature conditioning means for temperature conditioning said parisons to render same suitable for forming into said hollow plastic articles at the finishing station.

Abstract: Apparatus for coinjecting a plurality of thermoplastic materials to mold an article having a layered wall structure using thermoplastic material having different optimum processing temperatures including the maintenance of the optimum temperatures in flow paths individual to each material from its source to a mold cavity.

Abstract: The apparatus of the present invention involves transferring plastic parisons from a receiving station to a finishing station on a plurality of pallets in a single row for forming said parisons into hollow plastic articles. The pallets with parisons thereon are transported through a temperature conditioning means for temperature conditioning said parisons to render same suitable for forming into said hollow plastic articles at the finishing station.

Abstract: A telescoped assembly of sleeves for supporting, sealing and insulating a floating manifold between mold plates or other abutments in an injection molding machine.

Abstract: A highly maneuverable amphibious craft useful for transportation over rotten ice, slush, snow, swamps, mud, short spans of lowland, rough seas, ships wakes, growlers and the like.

Abstract: A mold core for ejecting a cup-shaped workpiece including a core base, a core cap fixedly engaged with said core base and a core sleeve seated on the core base and engageable with said core cap. A fluid ejection channel is formed at the interface of the core base and core sleeve for ejecting gaseous fluid to the peripheral surface of the mold core.

Abstract: Apparatus for continuously receiving and collecting molded articles from a continuously cycling injection molding machine where the articles are collected sequentially and continuously in a uniform physical position or orientation.

Abstract: A pressure molding machine of the type having a floating manifold including thermal expansion support elements for sealing and centering the nozzles relative to the floating manifold.

Abstract: A clamp mechanism for selectively locking and unlocking a first member in a first position relative to a second member comprises a linkage system connecting the first and second members and drive means for articulating the linkage system for moving the first member relative to the second member. A fluid link is provided for locking the first member in position relative to the second member wherein the fluid link is actuated upon sensing the first member approaching the first position.

Abstract: In an integrated system, plastic articles are produced in a pressure-molding machine and transferred therefrom to pallets at a receiving station. These pallets are entrained by a first branch of a conveyor which carries them through a temperature-conditioning station to an aftertreatment station in which a finishing operation such as blow-molding is performed upon the articles by a mold with which each pallet is temporarily consolidated. The pallets subsequently carry the finished articles to a discharge station and, upon their removal, are returned empty by a second conveyor branch to the receiving station.

Abstract: In injection-molding a plastic workpiece about a prefabricated permanent insert, a first quantity of plastic material is injected into one or more first-shot cavities through which a portion of the insert extends, thereby forming a corresponding number of annular spacers around that portion. After the spacer or spacers have solidified, the spacer-carrying insert is transferred to a second-shot cavity in which each spacer holds the insert separated from the walls of adjoining cavity sections. A second quantity of plastic material is then injected into the second-shot cavity to complete the workpiece by forming a sheath around the insert incorporating the spacer or spacers which are steadying same against lateral movement due to the pressure of the injected second-shot plastic.

Abstract: There is disclosed a method of operating an injection-molding machine to produce a composite item that includes a portion of soft material such as a set of bristles tending to cling to a mold cavity in which it is formed. At a first station, a relatively flexible plastic material is injected into a first cavity shaped to define the portion of soft material of the composite item, that portion including a backing layer. The portion of soft material is then allowed to cool, and at a subsequent station there is injected a relatively rigid plastic material into a second cavity bounded by the backing layer. The second cavity defines a harder portion of the composite item such as a brush handle. After the latter portion has also cooled, the portion of soft material is separated from the first cavity by pulling on the harder portion at a rate of speed slow enough to avoid rupture of the portion of soft material.

Abstract: There is provided a method for injection-molding an elongate hollow workpiece about a central core. A first quantity of plastic is injected into a first mold cavity through which part of the core extends, to form a spacer element around the core. After the spacer element has hardened, the core and spacer element are transferred to a second mold cavity in which the spacer element holds the core separated from the walls, thereby supporting it against lateral movement. Then, a second quantity of plastic is injected into the second mold cavity to complete the workpiece.

Abstract: A plasticizing screw of an injection-molding machine, axially movable in an extruder barrel, is driven by a tubular input shaft via a splined quill partly retractable into the shaft with which the quill is coupled through an internally and externally splined bushing. Another such bushing is removably seated, for possible replacement by a similar bushing of different inner diameter, in an internally splined cup-shaped head of the quill and engages the splined rear end of the screw. The quill head rests via a thrust bearing against the front end of a nonrotatable tubular piston coaxially surrounding the quill and entering by its rear end an annular cylinder which is hydraulically connected with a pressure accumulator including a gas cushion. The accumulator creates a back pressure by which molding material, plasticized by the screw during the preceding phase in which the screw was repressed into a rear position, is introduced via a check valve into a shooting pot alongside the extruder barrel.

Abstract: A nozzle for the introduction of liquefied plastic material into a mold has a channel terminating at one end in an injection orifice and adjoining at its other end a reduced bore serving for the guidance of a valve pin slidable with all-around clearance in that channel, the pin having a rear extremity projecting from its guide bore. A passage for the admission of liquefied molding material under pressure enters the channel at its junction with the reduced guide bore, rearwardly of a set of skew fins of the pin serving for additional guidance thereof in the channel and for imparting relative rotary motion to the flow and the pin. The orifice is blocked at the end of an injection operation by a pusher acting upon the projecting rear extremity; it is unblocked, upon withdrawal of the pusher, by the pressure of the molding material in the channel upon a forwardly facing annular shoulder of the pin.

Abstract: An injection gate of a mold cavity comprises an elongate valve rod which passes axially through a flow channel for molten plastic material and is guided in an extension of a thin-walled steel cylinder open at its opposite end toward an adjoining manifold plate. The rod extremity remote from the gate is secured to a tubular neck of a piston inside the cylinder whose stroke length is a fraction of the axial height of the cylinder's interior, a clearance around this neck providing space for drooling plastic while the length of the neck and of the peripheral cylinder wall serves for thermally insulating the manifold plate from the flow channel.

Abstract: A nozzle for the injection of liquefied plastic material into the gate of a mold cavity has a tubular metallic body forming a sprue, the outer surface of this body being in contact with an annular heater in the shape of a closed shell whose interior is filled with a matrix of compacted MgO powder having one or more resistance wires embedded therein. The heater is held in position by a nut, threaded onto a gate-side extremity of the body, against a shoulder or a tapering surface portion thereof and is separated by an air space from a surrounding supporting structure.

Abstract: Preforms or parisons to be blow-molded into bottles are produced in cavities of a lower mold half of a vertical injection-molding machine with the aid of respective cores depending into these cavities from an upper mold half when the mold is closed. As the two mold halves separate, the parisons adhere to the respective cores from which they are subsequently discharged into respective nests of a transfer box or respective cells of a blow-molding unit interposed between these mold halves. In the first instance, the parisons are cooled by a circulating air stream while the transfer box is laterally withdrawn before the start of a new injection-molding cycle, the rigidified parisons being then released from their nests to drop into pockets of an underlying conveyor transporting them to a blow-molding station. In the second instance, the cores are hollow and descend with their parisons into the blow-molding cells whose split walls are closed around the cores by fluidic or mechanical means.

Abstract: Preforms or parisons to be blow-molded into bottles are produced in cavities of a lower mold half of a vertical injection-molding machine with the aid of respective cores depending into these cavities from an upper mold half when the mold is closed. As the two mold halves separate, the parisons adhere to the respective cores from which they are subsequently discharged into respective nests of a transfer box or respective cells of a blow-molding unit interposed between these mold halves. In the first instance, the parisons are cooled by a circulating air stream while the transfer box is laterally withdrawn before the start of a new injection-molding cycle, the rigidified parisons being then released from their nests to drop into pockets of an underlying conveyor transporting them to a blow-molding station. In the second instance, the cores are hollow and descend with their parisons into the blow-molding cells whose split walls are closed around the cores by fluidic or mechanical means.