Abstract: A method of manufacturing hollow resin products which are curved two-dimensionally or three-dimensionally. The method includes extruding a tubular parison from an extruder at a constant speed and cutting the parison at a specified length; receiving the parison extruded from the extruder into a conveyer having a feeder which is driven at the same speed as the extruding speed of the parison; maintaining the parison in the conveyer by stopping the feeder temporarily; feeding a leading portion of the parison to a trailing portion thereof successively through an outlet of the conveyer into a cavity of a lower mold of a blow molding machine by driving the feeder, the cavity being curved two-dimensionally or three-dimensionally; and closing the lower mold with an upper mold of the blow molding machine and blowing compressed gas into the parison in the blow molding machine.

Abstract: The present invention relates to a method and a mould for forming an expansion, such as a socket, in a plastic pipe, and a plastic pipe. According to the method, the heated end of the pipe is placed in an external mould (2) and pressed against the mould surface (6) to form a socket. Two grooves (8, 9) can be formed in the socket by a simple method, using a mould ring (12) which is separate from the other parts (3, 4) of the mould and by means of which the grooves of the socket are formed. The ring is simultaneously locked into the socket (7), thereby functioning as a reinforcement ring.

Abstract: The invention relates to a method for fabricating hollow plastic objects of thermoplastic material, comprising the following steps: 1) injecting melt into the tool cavity (1,2); b) Simultaneously and/or subsequently introducing a pressurized fluid into the melt, so that the melt which has been introduced into the molding tool (1, 2) is distributed in the cavity and is pressed against the walls of the molding tool (1, 2), the pressurized fluid being conducted from a pressurized container (5) into the melt, and the pressurized container (5) being supplied with fluid by a compressor (7) which contains a drive element (6); c) allowing the molded part (8) to cool; and d) relieving the cavity of the pressure of the pressurized fluid. According to the invention, the drive element (6) of the compressor (7) is maintained at a temporally constant power level (P) at least over the production of a large number of plastic objects.

Abstract: Method of making a refillable polyester container having a low orientation base with improved resistance to caustic wash cracking. The method includes providing a preform with an upper base-forming thickened portion which resists axial elongation (thereby increasing the orientation of the body) and a lower base-forming tapered portion which decreases in thickness so as to gradually reduce the wall thickness of a central dome in the container base. The bottom of the preform base includes a central thickened region which is maintained in a recess during blowing to insure centering and prevent the formation of stress concentrations.

Abstract: An apparatus and method forms multiple resin layered parisons that are cooled or blown into bottles. The individual resin layers are injection molded in sequence and the formed parisons are transferred to each cooling and molding station by an axially and laterally indexing platen.

Abstract: A method of removing a flash portion from a container molded from an elastomer in which the flash portion is held stationary and the container is either inflated or deflated to increase or decrease the size of the container by moving the container walls whereby the stationary flash portions are torn or at least partially torn from the container walls.

Abstract: A non-coextrusion process for making multi-layer angioplasty balloons involves pre-forming separate parisons and then concentrically disposing the plural parisons to form a composite parison which is then subjected to a blow-molding process. The resulting balloon can have its properties tailored by appropriate selection of the particular plastics to be used for the multiple parisons.

Abstract: A biaxially-stretch-blow-molded container and a method of producing the same. Redraw ratio at the bottom portion is small in the secondary blow molding without employing a complex heating system but in which a secondary article obtained by subjecting a preform article to the primary blow molding is preferentially shrunk at its bottom portion, and a tertiary article or a quaternally article before being subjected to the secondary blow molding is obtained having a bottom of a flat shape or in which the central portion is recessed inwardly of the container and the periphery thereof is flattened. The bottle obtained by this method has a thickness and crystallinity in the bottom portion which are nearly the same as those of the center of the barrel and are highly oriented. The heat-resistant bottle exhibits excellent strength in the bottom portion and symmetrical panel-sinking stability in the vacuum pressure.

Abstract: In order to improve the productivity of pressure-resisting bottles by reducing the blow time from 4-5 seconds in a conventional bottle molding method to not more than 3 seconds, and mold pressure resisting bottles free from the occurrence of crazing and bottom-breakage, a biaxially stretched blow molded bottle (1) of a synthetic resin having a big foot type petaloid bottom is produced in a blow time of not more than 3 seconds, and after the product has been released from the mold, the bottom portion (3) has become not higher than 70.degree. C., whereby the shortage of the capability of the metal mold of cooling the bottom portion (3) is supplemented. This allows both the prevention of the irregular deformation of the central part (6) of the bottom portion, and the molding of the bottom portion (3) of high pressure resisting strength and mechanical strength with a sufficient height H of the central part (6) of the bottom portion ensured.

Abstract: The procedure is designed for the pneumatic operation of a device in which at least one structural element is pneumatically actuated. The actuation is done by primary working air, which is fed to the pneumatic structural element from a primary working-air supply. In addition to the primary working-air supply at least one secondary working-air supply is used, which is provided with a lower pressure level than that of the primary working-air supply. After the execution of a working operation by a pneumatic structural element by means of a compressed-air supply from the primary working-air supply, during a transition phase a venting into the secondary working-air supply is carried out. After the transition phase a venting of the first pneumatic structural element vis-a-vis an ambient pressure is carried out. A second pneumatic working operation is powered by air from the secondary working-air supply.

Abstract: A parison injection blow molding apparatus and method injection molds parisons, transfers them to cooling stations then to orient-stretch blow stations and thereafter ejection stations. While at the injection molding station, cooling stations and during transfer therebetween prior to being placed at the blow stations, the parisons are continuously cooled. The parisons are transferred to each station by an axially and laterally indexing platen.

Abstract: A parison injection molding apparatus and method injection molds parsons, transfers them to cooling stations and then ejection stations. While at the injection molding station, cooling stations and during transfer therebetween up to the time they are ejected, the parisons are continuously cooled.

Abstract: A method of attaching a clip to a tubular blow molded article and the clip, the method comprising the steps of: preparing a clip including a clip body and a clip base which is provided at a base portion of the clip body and has a hollow and a number of through-holes communicating with the hollow; inserting the clip body of the clip into a cavity formed on a molding surface of the mold such that the clip base projects from the molding surface; setting softened synthetic resin to the mold; and bringing the synthetic resin into close contact with the molding surface of the mold at a blow pressure so as to deliver the synthetic resin to the hollow and the through-holes of the clip base such that the synthetic resin is filled into the hollow and the through-holes of the clip base, whereby the synthetic resin is molded to the blow molded article having the clip projecting from its outer peripheral surface.

Abstract: A process for producing a formed article by heating a thermoplastic resin sheet and then thermoforming a part to be formed involves heating the part to be formed by placing in contact with a heating plate while at least a part of a non-formed part of the thermoplastic resin sheet is not heated by placing in contact with the heating plate, and then heating the part to be formed and at least a part of the non-formed part by placing them in a non-contact state with a heating means is disclosed.

Abstract: The invention relates to a blow moulding machine for manufacturing blow moulded large-volume vessels with upset flange rings from thermoplastic synthetic material. By changing exchangeable ring inserts, it is possible for two generically completely different vessel types--a plugged vessel and a removable-cover vessel body--to be manufacturable in one and the same blowing mould.

Abstract: A very thin inner layer composed of a polymer chosen for its barrier and/or inertness properties is fabricated within a container preform constructed mainly from another polymer, or a structure of polymers. The inner layer on the preform is produced either by a controlled coating method involving coating of the injection mold core rod prior to injection molding or by a coating applied directly to the preform after injection molding. This enables both inner and main layers to be brought together at a time when the interface between them is molten. A tie layer can be employed, when desirable, to enable the layers to be combined without melting the layer interface.

Abstract: In a process for the production of a hollow body such as a fuel tank from thermoplastic material, the wall thereof is subjected to a two-step treatment to influence the permeation properties of the material. In the first treatment step the wall is subjected to the action of a gas mixture containing fluorine and oxygen while in the second treatment step the wall is subjected to the action of a gas mixture which contains fluorine but is oxygen-free.

Abstract: Apertured plastic films comprise a stretchable thermoplastic polymeric material having a plurality of micro-holes defined by a network of fiber-like elements. The films are produced by directing fluids, especially water, against the upper surface of a starting film in the form of columnar streams in a contact zone, while the film is supported on a backing element. The films of the invention are useful as covering materials for absorbent products such as diapers, wound dressings and sanitary napkins.

Abstract: In a multilayer bottle having at least two layers including an outer layer and an inner layer according to the present invention, the inner layer and the outer layer adjacent thereto are separable from each other at a body of the bottle while the inner layer and the outer layer are adhered to each other at least a part thereof in order to prevent the deformation of the bottle due to the reduction of a pressure in the bottle. When the pressure in the bottle reduces due to the volatilization of a content in the bottle or due to the discharge of the content by a pump and the like, the inner layer is separated from the outer layer and is crushed in the form of a bag, so that the outer layer is not deformed at all.

Abstract: In a blow molding process, a fused thermoplastic polymer parison is interposed between a pair of split molds. The split molds are closed around the parison to seal the ends. A small diameter hollow needle is inserted through one of the split molds and fluid is blown into the parison forming a balloon. After the balloon begins to form, a large diameter hollow needle is inserted while internal pressure is applied to the parison via the small diameter hollow needle, and a large amount of fluid is blown in. This process is highly productive and reduces the conventional blow molding cycle by 60 percent due to the rapid cooling of the hollow article.