Abstract: A method and apparatus for combined injection moulding and blow forming of containers or objects of plastics material. A preform is formed on a mandrel by injection moulding. The mandrel with the preform is transferred from the injection mould to a blow forming mould and the preform is blow formed to the final product. It is characteristic of the invention that the preforms are formed in the injection mould and extracted from the injection mould at a higher rate than their forming in the blow forming mould, two or more preforms being simultaneously blow formed in two or more blow forming moulds. This arrangement has the advantage of providing complete independence of the two production cycles. The apparatus includes a conveyor for the mandrels carrying the preforms, this conveyor extending from an injection mould to a blow forming mould.

Abstract: In foundry core-making or mold-making apparatus employing a rotary mixer working in a chamber and mixing together a sand-resin mix and a sand-catalyst mix to produce a cold quick-setting mixture that is then quickly discharged through the bottom of the chamber into a core-blower or molding machine, the chamber is fixed and has two separately movable sliding shutters controlling openings in its floor (it may be one long opening), one shutter controlling discharge into the blower or molding machine and the other controlling discharge of any residue to a waste chute. Preferably the first shutter uncovers a peripheral portion of the floor first, the discharge area thus growing from the periphery in a radial inward direction.

Abstract: A shuttle is mounted in a passage connecting ducts from injection barrels. An outlet in the passage wall connects to a common sprue channel. The shuttle isolates one duct from the opening at each end of its travel but at no time blocks the opening. The shuttle is preferably a ball and is preferably located in the spigot of a shut-off tap.

Abstract: A molding system for producing articles of mottled appearance includes a plasticizing unit having an inner bore which communicates with a mold cavity. A feed screw is mounted within the bore and is connected to fluid-actuated motors for rotary and translational movement within the bore. A spreader device is positioned in a heated part of the bore ahead of the feed screw. The screw is rotated to feed and soften molding materials of diverse coloration and is subsequently translated to push the materials through the spreader device such that final plasticization occurs. A bridging conduit is provided between the rotary and translational motors to divert a controlled amount of fluid from the latter to the former during a pushing operation, to rotate the screw forwardly at a controlled rate or to hold pressure on the screw to prevent backward rotation or to limit the amount of backward rotation.

Abstract: Continuous production of a molded three-dimensional product employs an indexing rotatable drum having along its periphery a plurality of mold cavities into which molten thermoplastic material is introduced, and a web of material permeable to the molten thermoplastic material and which is guided along the drum periphery. In one embodiment the thermoplastic material enters the cavities through the web to which the thermoplastic is subsequently bonded. The thermoplastic material in the cavities is then shaped and cooled before it is removed from the cavities by dissociating the web from the drum periphery. In a second embodiment the molten thermoplastic material is introduced into the cavities before the web is associated onto the drum periphery. After cooling the thermoplastic to bond it to the web, the web is dissociated from the drum and removes the molded thermoplastic from the cavities.

Abstract: Apparatus for forming a refractory lining is disclosed which comprises a molding box for forming a refractory lining of an inner wall of a container for molten metal made up of an irregularly shaped mass of refractory material which has been vibrated and given thixotropic fluidity. The molding box is positioned within the container having at least one hole pierced in its bottom and means are provided for opening and closing the hole and vibrating the molding box, with the hole being connected with a vessel for vibrating the refractory material.

Abstract: Ingot casting splashcans are formed of a composition which melts during teeming of the ingot to form a molten casting flux.

Abstract: In the apparatus for preparing heat-shrinkable plastic tubing by radially expanding lengths of plastic tubing to a larger diameter within a rigid cylinder by heating the cylinder externally and pressurizing the interior of the extruded plastic tubing with gas to cause the tubing to radially expand against the interior walls of the rigid cylinder,The improvements which comprise:A. employing in place of the rigid cylinder a heat-resistant flexible sheet looped into a cylindrical shape to form a restraint,B. employing a pair of clamps extending longitudinally along the cylindrical shaped sheet along the portions of the sheet which meet and abut to form the cylinder, positioned such that the ends of said sheet are between the clamps, andC. employing means for heating the tubing comprising a device for injecting a hot gas into the interior of the extruded plastic tubing.

Abstract: Injection blow molding equipment for the production of hollow articles wherein cores are axially inserted in blow molds and blank molds is disclosed. Compact core assemblies and fluid supply systems integral with the platens allow the mold parts to be mounted on the surfaces of opposed, relatively movable platens. Partible neck rings associated with each core open divergently outwardly as the blow mold and core separate, to shorten machine cycle time. A manifold, supplied with cooling fluid from the periphery of a core mounting plate, distributes heat transfer fluid to the core assemblies for cooling the neck rings. In one embodiment, mating blow mold sections are mounted on contra-oscillatable mounting members and are opened and closed by arcuate movement of the mounting members.

Abstract: A three-part histologic tissue receptacle and embedding structure comprises an identification, open-ended, mold section, a pan section, and a perforated top section which can be slid over the mold and pan sections and retain all three sections in a closed relation. The mold, pan and top sections of the structure may be arranged for service, with the pan telescoped in the mold section, as a perforate, integral, shallow depth, receptacle for holding and transporting the tissue specimens through various liquids during processing, as a mold for embedding the specimen, as a holder for holding the embedded specimen in a microtome during slicing and after slicing, as a housing for holding and protecting the remaining unsliced embedded specimen during extended storage.

Abstract: An improved apparatus for forming blow molded articles of enhanced physical characteristics by orienting the material during the formation of the article. A two-stage blowing operation is provided wherein a pre-form blow mold effects a uniform and controllable transfer of heat from a freely extruded tube. The pre-form is conditioned, both thermally and dimensionally, within the pre-form for most effective orientation during a subsequent final blowing operation. Manipulatively, the disclosed method provides a completely overlapped pre-blowing and final blowing operation, and more than one set of pre-blow and final blow molds may be utilized at a single extruder orifice, if desired. Further, the direction and extent of movement of the molds adapts the apparatus to presently existing blow molding machines, while increasing the machine output. Successively utilized blow tubes form and reform the open or blowing end of the tube to a final configuration.

Abstract: This invention relates to a plastic closure or cap-type stopper of which the outer skirt has formed on its inner surface a plurality of ribs adapted to engage the top ring and the grooves of the neck of the container to be stopped, on either side of a partially tearable guaranty strip bounded by circular thinning grooves formed in the inner surface of the skirt.The mold for manufacturing this closure comprises underneath a fixed plate formed with holes for the passage of the ejection ring and ejection shaped sleeve of a sliding plate perforated like the fixed plate and actuated by a pusher, and above a sliding impression plate of which the perforation corresponding to the preceding ones bounds the injection chamber for the closure skirt on the core, said sliding impression plate being actuated by a pusher for releasing the closure from the mold impression at the end of its stroke.

Abstract: This invention reduces the time that a core rod must remain at an injection station of a plastic blow molding machine. The injection operation is usually performed by a plasticizer, and while the injection operation itself requires very little time, the plasticizer performs other roles that must be complete before the next injection. This invention uses two plasticizers alternately so that one can inject while the other recovers for its next injection operation. A plastic pump is used to relieve the plasticizers of some of the operations that they previously performed.

Abstract: A butt welded tube is provided having excellent properties by the steps of forming a skelp onto a round shape, butt welding the edges thereof with butt welding rolls, blowing oxygen or air into the weld zone, so that said zone is brought to a melted condition with oxidizing heat based on said blowing and some notches which are formed are blown off with said blowing, and then said tube is passed through a train of reducing rolls to obtain a smooth surface and the required dimension of said tube.

Abstract: This invention decreases the time required to cool a plastic article, in a blow molding cavity, by circulating a mist in the inside of the blown article. Globules of liquid in the mist contact with the inside surface of the blown article. Preferably this liquid evaporates and removes its latent heat evaporization from the plastic surface. This removes more heat per unit of time than is removed with a breeze of dry air flowing in the blown article. The article is cooled so that it is stiff enough to remove sooner from the blow mold. The mist can be followed by dry air to remove any lingering liquid from a blown container.

Abstract: There is disclosed herein a method for blow molding a bottle, for instance, from a tube of thermoplastic material. The method includes filling such a container, if desired, with a fluid prior to sealing of the bottle. The bottle has at least one orifice which may be sealed with an integral membrane and a further protective cap is integrally molded with the bottle. More particularly, apparatus is also disclosed for molding, filling and sealing such bottles in one operation from a tube of thermoplastic material which has relatively movable mold parts.

Abstract: In order to weld a cup-shaped member to a ring, claws are secured to the exterior surfaces of each part. In addition, a resilient member such as a ductile aluminum plate is placed between each pair of claws. The parts are spaced apart to form a gap in which a welding seam can be made. During cooling, the welding seam shrinks. This causes the aluminum plates between the claws to plastically deform. Thereafter, the claws and plates can be removed and the finished welding carried out.

Abstract: In inflating a parison via a hollow needle carried on a piston slidably reciprocable with respect to a blow mold cavity, the improvement comprising means accessible through the forward end of the needle for releasably securing the needle to the piston.

Abstract: In accordance with the teachings of the instant invention, there is disclosed an injection molding head for forming honeycombed structures of thermoplastic materials, which comprises a fixed mouthpiece having a plurality of strand channels extending longitudinally therethrough; a plurality of guide channels extending longitudinally therethrough and interposed between said strand channels; a strand deviation guide mechanism comprising a plurality of elongated members each slidably mounted in one of said guide channels; a frame arrangement attached to one end of each of a group of the elongated members for moving in a longitudinal direction one end of each of the elongated members beyond the exit end of the fixed mouthpiece for the provision of high thrust, lateral forces proximate to the output of said strand channels, and withdrawing the ends of the said elongated members from said extended position to within said fixed mouthpiece; and a drive apparatus coupled to the frame arrangement for moving the frame ar

Abstract: An injection mold is disclosed for making an article having a plurality of side walls defining an enclosure. The mold elements during opening and closing of the mold move in a coordinated manner via mechanical interlocks. A first mold section carries plural side wall members that slide between a closed position and an open position. A second mold section interlocks with the side wall members to carry them from their closed to their open position and the side wall members are themselves linked to a stripper ring that strips the article from the mold. Other features are disclosed.