Abstract: The present invention provides a method of manufacturing resinous containers comprising: a preparing process in which segmental molding dies are prepared, the segmental molding dies comprising a first cavity for molding hollow bodies and a second cavity for molding auxiliary parts and a third cavity for holding the auxiliary part which communicates with the first cavity; a pre-molding process in which a resin parison is supplied between the segmental molding dies, the segmental molding dies are clamped, a compressed gas is blown into the resin parison to expand the resin parison within the first cavity and to fit the resin parison to the surface which forms an outline of the first cavity, of the segmental molding dies, the compressed gas is discharged from the resin parison, and the segmental molding dies are opened to take out a formed hollow body and a formed auxiliary part; and a main molding process in which the same process as the pre-molding process is implemented except that the formed auxiliary part i

Abstract: A flat and nearly mechanically isotropic polymer film or sheet, or a tube, can be formed by laminating two or more films, preferably by coextrusion of a liquid crystal polymer film and a thermoplastic polymer film. A liquid crystal polymer layer may be combined with one or more thermoplastic polymer layer in various arrangements. The liquid crystal, and possibly the thermoplastic as well, may have a controlled molecular orientation. The film may be formed by passing a polymer through a set of two or three tubular rotors which are concentric and have facing surfaces which define inner and outer annular polymer flow channels.

Abstract: A laminating blow molding method for making a hollow article includes steps of: laminating a resin sheet on an outer surface of a parison extruded from a path between a die head and a core; sandwiching the parison with the resin sheet between a pair of mold pieces constituting a mold while heating the mold to a temperature exceeding softening temperatures of the resin sheet and the parison, one of the mold pieces having shifting members at side portions thereof; closing the mold so that the parison with the resin sheet is held inside the mold, and moving the shifting members to the other of the mold pieces so that overhangs at both ends of the parison and resin sheet are pressed rearwardly to shift rearwardly burrs which are pressed out from the mold; and blowing the parison to perform blow molding. Thereafter, the mold is cooled and the molded article is taken out. In the method, a front side of the molded article is formed smoothly.

Abstract: A flat blow molding machine adapted to extrude flat hollow parison from clearance between a flat core and a flat die surrounding the core, characterized in that both ends of the die are slidable in a width direction with respect to a center, the core is replaceable in accordance with expansion and contraction of the die in the width direction. According to this construction, it is possible to change the width of the flat hollow parison extruded from the clearance between the core and the die by sliding the both ends of the die in the width direction and replacing the core upon expansion and contraction of the core in the width direction. Further, if the flat core is constructed from a planar replaceable portion and curved (three dimensional) non-replaceable portions and only the planar replaceable portion is exchanged upon replacement, preparing a plurality of inexpensive-to-manufacture planar replaceable portions having different lengths is enough and the cost is reduced.

Abstract: A process and a device for producing a thin-walled prophylactic, which is manufactured in a plurality of immersion stages, is disclosed. The device includes an endless conveyer belt on which an elongated cylindrical immersion tool is mounted. The process substantially consists of three immersion stages and three different immersion tubs, whereby the depths of immersion of the immersion tools substantially deviate from each other. After each immersion stage, a predetermined heat treatment of the elastic material applied to the immersion tool is carried out.

Abstract: A mandrel assembly for use in shaping and injection molds, the assembly includes a support having compressed air channels, and a mandrel extending upwardly from the support and having spaced-apart ramps extending radially outwardly therefrom. A cap slidingly fits over the mandrel and has a free end positioned over the compressed air channels of the support. The cap also has an inner groove loosely receiving the ramps of the mandrel such that the cap is secured to the mandrel yet is able to slide up and down on the mandrel such that the free end of the cap will cover and uncover the channels. According to another embodiment of the present invention, the mandrel has an outer groove, and a plurality of balls are received in the outer groove. The cap has an inner groove corresponding to the outer groove that loosely receives the balls such that the cap is secured to the mandrel yet is able to slide up and down on the mandrel such that the free end of the cap will cover and uncover the channels.

Abstract: An extruded tubular molding is clamped at upper and lower portions thereof to form an air-tight space therebetween and thereafter compressed within two corresponding halves of a molding die and molded into the configuration of a final product. The lower portion of the molding is first clamped and lowered to stretch the molding downwardly prior to clamping the upper portion and compressing the molding in the molding die.

Abstract: A method of producing an injection molded article, such as a pallet made of a polymeric material. The pallet having an integral rim. Said rim is manufactured by means of a gas injection procedure involving a mold and means for injecting a pressurized gas into a molten polymeric material in the mold. The injection of the pressurized gas results in at least one substantially closed circumambient hollow internal channel in the rim, wherein the mold is provided with one or more mold cavity portions with an enlarged or expandable cross-section providing the outer shape of at least parts of the rim. The mold is further provided with at least one gate for injection of a molten polymeric material, and at least one gas duct for injection of the pressurized gas into the core of the molten polymeric material. Each gas duct is connected to a reservoir cavity, which reservoir cavities collectively form a part of the mold cavity portions.

Abstract: A method is provided for gas-assisted injection molding for forming a hollow product. The mold cavity is prepressurized with fluid prior to injecting the molten material into the mold cavity, and the molten material is injected into the mold cavity against the pressurized fluid to establish a resultant internal counterpressure within the molten material. A pressurized assist-gas is injected into the molten material to form a gas bubble within the molten material. The injection of molten material into the cavity is then controlled in a manner to maintain the internal counterpressure at desired levels to overcome stress forces and to control formation and movement of the bubble within the melt.

Abstract: In an injection stretch blow molding method, at least one injection molded preform is transferred from a preform molding section to a blow molding section by way of a transfer section and the at least one preform is blow molded into at least one container in the blow molding section. In the preform molding section the at least one preform is injection molded in an upright state with an open neck section thereof facing upward. In the transfer section, the at least one upright preform is turned upside-down and transferred to the blow molding section in an inverted state. Then, the blow molding section blow molds at least one container from the at least one inverted preform.

Abstract: Proposed is a process for injection molding of products (1) made of thermoplastic material, whose walls (2) enclose a hollow space (3), wherein the molten plastic is injected in a predetermined amount into the cavity or molding nest (6) of a mold (5), during and/or upon which a fluid pressure medium (gas) is applied so that with the formation of the hollow space the molten plastic is distributed along and set against the walls of the cavity or molding nest. The pressure medium (gas) is fed into the cavity or molding nest (6) and into the molten plastic at first essentially only in the direction of flow of the molten plastic and in a quantity and/or at a pressure that causes a void (8) to form within the molten plastic, terminating at a distance from the end of the flow path.

Abstract: An improved seal or boot for inhibiting contaminants from interfering with operation of a mechanism having two flexibly interconnected components which axially extend from opposite ends of the seal. The seal is formed as a one-piece hollow and elongated body defining an enclosed cavity wherein the pivotal connection of the mechanism is arranged and having first and second annular mounting ends. The first and second annular mounting ends are configured to allow the components of the mechanism protected by the seal to axially extend therefrom. To permit flexural movement of the seal and the interconnected components of the mechanism protected by the seal, a plurality of bellow-like configurations are disposed along a major length of the seal between the first and second mounting ends. Each bellow-like configuration on the seal has predetermined root and crest diameters with wall sections of a predetermined material thickness extending therebetween.

Abstract: Complex-shaped articles formed by gas-pressure-molding composite preforms of liquid crystal polymer and porous polytetrafluoroethylene material are described. Processes for making the composite material preforms and parisons needed for gas-pressure-molding methods, such as vacuum-molding and blow-molding, are also described.

Abstract: An injection mold system and corresponding method that equalizes pressure of flowable plastic dispensed into an injection mold cavity. A gate in communication with the mold cavity introduces a quantity of flowable plastic into the cavity at a predetermined pressure. A gas inlet in communication with the mold cavity at a mold cavity location remote from the gate introduces a gas into the mold cavity to pack the flowable plastic in the mold cavity at a pressure corresponding generally to the predetermined pressure, to thereby minimize the formation of sink marks and warpage on an injection molded part formed therein. The present invention insures formation of the part with a highly finished appearance surface and eliminates the need for painting or otherwise additional finishing of the part.

Abstract: A method is described for injection-moulding a product by means of the so-called gas-injection method. A special feature of the method is that in addition to the injection of gas into the product cavity (10) via a first gas inlet (51), gas is injected into a spill cavity (20) via a second gas inlet (52). The amount of material (1) flowing from and toward the spill cavity (20) can be controlled by the location of the second gas inlet (52). Moreover, a variant of the method prevents the formation of so-called dead ends. By means of another variant of the method in accordance with the invention it is possible to prevent the occurrence of so-called flow lines.

Abstract: An injection compression molding method is characterized in that a resin is injected from a resin gate provided near a recess portion of a mold corresponding to a thick rib portion, gas is injected from the thick rib portion before the mold is closed and compressed, and thereafter the resin is made to flow back from the resin gate to an injection nozzle while the mold is closed and compressed.

Abstract: A heat-resistant container molding apparatus and method which are compact and inexpensive and can reliably increase the crystallinity, reduce the residual stress in a container filled with a hot content such as thermally sterilized fruit juice, and prevent a thermal deformation with improved container stability at a raised temperature. The apparatus has a receiving and removing unit for receiving primary moldings obtained by blow-molding preforms and for removing final products, a heat treatment section for heating the primary moldings by bringing the primary moldings into contact with the inner wall of a heat treatment mold while pressurizing the interior of the primary moldings within the heat treatment mold, a final molding section for blow molding intermittent moldings into final products within a final blow mold, and a rotary plate, neck support fixing plate and neck support member for conveying the moldings through the receiving and removing unit, heat treatment section and final molding section.

Abstract: The present invention is a process for making a nanochannel glass (NCG) rica, having the steps of: coating a face of an etched NCG with a replica material (with or without an intervening buffer layer), where the etched NCG face has a plurality of channels arranged in a desired pattern, to form a replica coating on the NCG conforming to the pattern; and removing the replica coating from the etched NCG. The present invention is also the replica made by this process.

Abstract: The invention relates to a preform for a polyester bottle, having applied to its surface a coating of a material that lowers the coefficient of friction of the polyester and to a method of producing a preform for a polyester bottle, provided with a coating of a material that lowers the coefficient of friction of the polyester used, comprising producing a preform by means of extrusion or injection moulding, followed by applying said coating to the preform.

Abstract: Disclosed is a method for the injection molding of a resin to produce a shaped resin article having a thick portion biasedly, wherein an excess filling of the cavity of a mold is effected to form a molten resin mass having opposite, first and second surfaces respectively facing opposite, first and second inner walls of the mold cavity, the mold having a specific structure in which a gas-release passage is formed in association with the mold cavity and with a mating surface of the mold, which gas-release passage has an inner opening in an inner wall surface of the mold cavity and communicates with the outside of the mold, and a pressurized gas is introduced into the mold cavity on a side of the first surface of the molten resin mass, thereby forming a closed space which is filled with the pressurized gas and separated from the gas-release passage through the molten resin mass, so that the pressurized gas filled in the closed space urges the second surface of the molten resin mass to be pressed against the seco