Abstract: A mold assembly is provided for making a thermoplastic container having a bottom, side and unitary closure or top wall means with a parting line along a plane of symmetry in the bottom and sidewall means but with the parting line offset on the top wall means to define a generally flat, pierceable membrane on a major portion of the exterior surface of the top wall means. The mold assembly molds and seals the container from a tube of thermoplastic material, which assembly includes mold parts having lower sections adapted to open and close relative to a center parting plane to shape the bottom and sidewall means of the container and having a pair of upper sections adapted to shape the unitary closure. One of the upper sections has a removable protuberance for forming a major portion of the container top closure surface with the mold parting line thereon offset relative to the center parting plane of the mold assembly.

Abstract: Air conduits or ducts, including convoluted or bellows-type ducts, are prepared by molding a resinous mixture consisting essentially of a polypropylene and a polystyrene-polyolefin block copolymer. Inert fillers can be present in the mixture.

Abstract: Disclosed are new copolyesters of terephthalic acid, bis(4-.beta.-hydroxyethyoxyphenyl)sulfone, ethylene glycol and a very small amount of a trifunctional cross-linking agent, particularly useful as molding compounds, especially for the extrusion-blow molding process of making hollow articles, and a method of making hollow articles.

Abstract: A method for forming multi-directionally oriented plastic articles by shearing a thermoplastic material in a non-linear shear pattern while the material is at a temperature conducive to orientation and further processing the material by known plastic forming techniques to form an article in which the material remains oriented. More specifically, thermoplastic material is plasticized and accumulated in an amount at least sufficient to form the article, and the material is expressed under pressure from the accumulated body to and through an orifice. The material is non-linearly sheared prior to its issuance from the orifice to induce orientation stresses into the material, and, during shearing, the material is at a temperature which is conducive to orientation.

Abstract: An accumulator head is described as having an annular accumulation chamber, an annular ring-piston movable axially through the chamber, an inlet through which plasticized resinous material is forced into the chamber between opposing ends thereof, and a special feature built into the ring-piston which causes material, flowing into the chamber, to wipe the face or tip of the piston and keep it clean and free of any material. A discharge passageway leads from the accumulation chamber to a discharge orifice adjacent which a parison is formed by resinous material from the chamber. Another inlet is provided in the discharge passageways as a means of providing a final, outer layer or laminate of material to that flowing out the discharge passageway from the chamber.

Abstract: An accumulator head is described as having an annular accumulation chamber, an annular ring-piston movable axially in the chamber for forcing resinous material from the chamber through an annular discharge passageway leading from the chamber to an annular discharge orifice which, for example, is in communication with a blow mold. An annular inlet is provided in the discharge passageway between the chamber and orifice as a means whereby resinous material is moved into the discharge passageway to add an outer laminate to material flowing through the discharge passageway, or as a means of filling the accumulation chamber with a slug of material.

Abstract: Method for forming blow molded containers with integral handles for carrying and/or pouring. A preform with an integral handle having a ring and projection is formed, supported by the ring, and expanded below the ring to form a container. The projection can be maintained spaced from the expanded container portion or can be joined thereto during or after expansion.

Abstract: A squeeze toy of air-filled elastomer material including a whistle, and a method and apparatus for forming the same. A small cavity or depression is molded into the body of the toy to form the whistle site. A small cap, which may comprise a flat or slightly rounded disk, or a small hollow cylinder, closes the small cavity or depression forming the whistle site. A pair of small openings are formed in centered, aligned relation in the cap and in the bottom of the cavity, completing the whistle. The body of the toy is preferably formed by blow molding techniques, using the opening in the bottom of the cavity corresponding to the whistle hole to blow air in during the molding process, and to blow the finished part out of the mold. The whistle cap may either be made simultaneously with the body, by blow molding, or by separate injection molding techniques.

Abstract: A method for making a minor change in the bottom configuration of a blow molded container and bottle formed of a plastic material which compensates for shrinkage in the bottom structure due to improper cooling whereby the improper cooling may be advantageously utilized to provide for a marked decrease in the blow molding cycle time.

Abstract: A method of producing a form retaining container made of synthetic plastic material comprising feeding a plastic material in liquid state onto a male member to provide a layer on the male member constituting a blank for the container. The layer is cooled to prevent crystallization of the material. The thus cooled blank is placed into a mold cavity having an interior configuration corresponding to the desired outer shape of the container to be produced. The layer is inflated into conformity with the mold cavity. The configuration of the mold cavity is such that the blank undergoes biaxial stretching in a middle region of the container by at least 1.5 times while the mouth and part of the bottom of the container will be formed by biaxially stretching the blank less than 1.5 times. The inflated blank is then heated until curing is completed and then the blank is removed from the mold.

Abstract: A lower mold half is horizontally placed. The top surface of the lower mold half is provided with a first groove of any desired shape, one end of which is closed with the other end having a notch for allowing air to be blown in. An upper mold half has a bottom surface which matches with the top surface of the lower mold half and which is provided with a second groove corresponding to said first groove. Thus, when the upper and lower mold halves are in contact, there is formed a mold cavity defined by the first and second grooves. A nozzle for discharging a parison is disposed above the lower mold half. The relative positional relation between the nozzle and the lower mold half is changed in such a manner that the nozzle follows the first groove without changing the distance therefrom so that a parison can be properly placed in the first groove. If at least two lower mold halves are provided, it is possible to carry out molding operation continuously.

Abstract: A process is disclosed for modifying polyethylene terephthalate so that the polyethylene terephthalate may be processed into plastic containers using conventional extrusion blow molding equipment. The polyethylene terephthalate is modified by the incorporation into a polyethylene terephthalate prepolymer of a chain branching agent and a chain terminating agent. The prepolymer is subsequently solid-state polymerized to form a polyethylene terephthalate polymer having high zero shear rate melt viscosity and shear sensitivity. This modified polyethylene terephthalate polymer may be extrusion blow molded in intermittent and continuous processes.

Abstract: Hollow shaped articles are extruded, advantageously continuously extruded, from molten thermoplastics by controlled cooling of the molten charge prior to entry into an extrusion die.

Abstract: A method and apparatus are disclosed for blow molding a container with an angular neck from a parison of thermoplastic material at a single station at which extrusion of the parison, compression molding of the neck of the container and blowing of the parison occurs. In the method, the mold sections, which have a cavity that defines the container with the angular neck, are pivotally mounted so that the parison can be positioned between the open mold sections in the desired location, and after the mold sections are closed on the parison, the mold sections are pivoted so that the angular neck is aligned to receive a blow pin for performing the compression molding and blowing operations.

Abstract: A mixture of water and surfactant is introduced interiorly of a parison in the course of blow molding thereof. Lessening of die closure time and improved conformity of dimensions of molded articles to corresponding dimensions of forming dies are achieved.

Abstract: Disclosed are new copolyesters of terephthalic acid, bis(4-.beta.-hydroxyethoxyphenyl)sulfone, ethylene glycol and a very small amount of trimellitic acid, particularly useful as molding compounds, especially for the extrusion-blow molding process of making hollow articles, and method of making hollow articles.

Abstract: The present invention relates to mixtures comprising about 60% by weight to 5% by weight of aromatic polycarbonates which have a Mw between about 60,000 and 120,000 (component A) and about 40% by weight to 95% by weight of aromatic polycarbonates which have a Mw between about 28,000 and 40,000 (component B), as well as to processes for their preparation and their use for the production of shaped articles. The melt which can be prepared from the mixtures according to the invention has a high stability and the films obtainable therefrom have a high resistance towards stress cracking.

Abstract: A tray of thermoplastic material having means releasably latching a power tool in storage position thereon with the tool handle oriented to serve as the carry handle for the tool and attached tray, the tray providing storage for the power cord and accessories. An opening through a wall of the tray is defined by shearing the material during the blow mold cycle.

Abstract: A process and apparatus for blow-molding hollow bodies in a mold having half-molds which are closed along a mold joint during blow molding and are laterally displaced with respect to one another to open the mold for removal of the formed hollow body. The half-molds are shaped to form a concave bottom on the hollow body and when the half-molds are opened they impose a translation movement on the hollow body. A plug is formed at the bottom of the hollow body during molding which plug is seized by pincers prior to the opening of the mold such that the hollow body is supported by the pincers during mold opening. The pincers are displaced during mold opening, in translation parallel to the plane of the mold joint, over a distance at least equal to that imposed on the hollow body by the half-molds during opening of the mold.

Abstract: A hollow doll in which the doll's head is formed of elastomer material, and is blow molded to include a downwardly extended annular lip having a semicircular groove at the front of the neck. The lip is constructed to fold inwardly, and to engage a bead or flange on the neck portion of the body, thereby securing the head to the body. It is contemplated, in accordance with the present invention, that other appendages can be secured to a primary body in a similar manner.

Abstract: Tubular film-forming system in which a tubular extrudate is rapidly cooled and the cooled tube is withdrawn by engagement with a movable fluid-shedding surface which firmly grips the tube without damaging the surface thereof. The system is particularly suitable for gripping a tube the surface of which is moistened by liquid from an annular cooling bath.

Abstract: Blown film sheeting is manufactured using a tubular film blowhead fitted with internal and external air cooling devices, a collapsible frame for flattening the tubular film and a slitting device positioned above the frame for producing the film in sheet form just prior to removal of the film on dual takeoff rolls. The invention is particularly adaptable for thermoplastic polyethylene film.