Abstract: In the hot parison method of stretch blow molding, the temperature distribution of the body wall of the injection molded preform is changed to a gentle gradient slope shape from a mountain shape not by the external application of heat, but by the preform itself, to prepare a bottle with an improved top load value. After the injection-molded preform is released from the mold, cooling of the inner side of the preform is continued by the injection core. Inner side cooling is terminated by release from the injection core. The preform is left in a hollow state for a time, the temperature-averaging time, until the outer surface temperature drops to the stretch blow molding temperature, after passing a peak temperature. While in the molding temperature region, stretch blow molding of the thin-wall hollow molded article is conducted.

Abstract: A preform of injection-molded PET has a body wall thickness of 3.0-4.5 mm. The preform is high-temperature mold-released from an injection cavity mold and an injection core. Pre-blowing of the preform is restricted at 5±0.5 seconds after the mold release, at a temperature of 112-117° C. of the pre-blow mold, and for a pre-blowing time of 0.5-1.0 second. Air blowing is applied to expand only the body of the preform. Stretch blow molding is performed restrictively at 3-4 seconds after the mold release from the pre-blow mold, at a temperature of 103-107° C. of the blow mold, and for an air blowing time of 6-9 seconds, thereby stretch blow molding the preform into a bottle and simultaneously heat setting to impart heat resistance to the bottle.

Abstract: To realize direct and intermittent rotation of a transfer member by directly coupling the rotary part of a servo motor with a rotary shaft. A supporting board is arranged side by side with working space 3 made vacant above a machine base. The center part of a transfer member arranged on the undersurface of a supporting board 4 is coupled with a rotary shaft 7 of a relatively large diameter inserted through the center of the supporting board and mounted on a bearing. The servo motor 8 provided with the fixing part 8b inside of the rotary part 8a of the large diameter in the center of the supporting board 4 is attached to a supporting base 15 erected on the supporting board 4 via a joint 18 on the side of the fixing part 8b. The rotary part 8a is mounted on the top of the rotary shaft 7, and thereby the transfer member 6 is constructed so as to be directly rotated with the rotary shaft 7 by the servo motor 8.

Abstract: A biaxial stretching bottle in which a pair of carrying handles are provided oppositely constituted on both sides of a neck portion in such a manner as to be bent freely, and the biaxial stretching bottle having the carrying handle with a structure which can improve durability strength of a base portion and a connection structurally. A pair of U-shaped carrying handles, which a handle grip portion and an arm portion of both sides are formed integrally, are connected to and formed on both ends of the base portion constituted by overhang pieces formed on the symmetrical positions of both sides of the neck portion. Brackets are constituted unitarily across the lower surface of the vicinity of both ends of the base portion and a side surface of the neck portion and stoppers are projected and arranged on the upper surface of the base portion.

Abstract: A mold clamping apparatus in which hydraulic oil that is forcibly discharged into hydraulic lines from one of two kinds of cylinders, that is, a differential mold clamping cylinder and a mold clamping oil chamber of a mold opening/closing cylinder, is, in an alternating manner, provided to the other cylinder as its operating oil. This feature enables the simultaneous operation of the two kinds of cylinders as well as reduction in operating time in which the mold is opened or closed. The mold clamping apparatus includes a stationary mold, a movable mold which closes with respect to the stationary mold, a core movable through the movable mold into and out of the stationary mold. The movement of the core into and out of the stationary mold is effected by a differential mold clamping cylinder which is separate from a mold opening/closing cylinder for the movable mold and is fitted with a booster ram.

Abstract: A biaxially oriented bottle having a carrying handle is provided. A carrying handle, which is provided at a side surface of a neck portion, and which is injection molded together with the neck portion of a preform, is used without further modification as the carrying handle of a biaxial stretching blow molded, thinly formed bottle. The carrying handle is integrally formed in a U-shaped configuration from a grip portion and arm portions on both ends of the grip portion. The arm portions are integrally formed with base portions comprising projected pieces formed at symmetrical positions on both sides of the neck portion. The arm portions, moreover, extend out to the sides with a length greater than the height of the neck portion. The boundary of the base portion and arm portion is thinly molded by being constricted and forms a connecting portion which can be freely bent in a vertical direction.

Abstract: A heat-resistant packaging container made of a polyester resin, formed by stretch-blow molding is provided. A top portion of a bottom face is formed to have a large wall thickness to impart a resistance to heat deformation. A peripheral wall of the bottom face is formed to have a wall thickness that is gradually reduced from the top portion toward an arc grounding edge around the bottom face. An outer peripheral wall of the bottom portion is stretch molded from inside of the grounding edge so as to have a wall thickness as same as that of the body portion to attain a heat resistance. The inside of the grounding edge connecting to the peripheral wall of the bottom face is formed into a tilt surface which is oriented upwardly in consideration of an amount of expanding deformation &agr; of the grounding edge due to heating and loading.

Abstract: A biaxially stretched bottle made of a thermoplastic resin having a carrying handle formed by integrally injection molding on the side of a lower neck portion of a preform at the same time when the preform is molded and applied as-formed as a carrying handle of a thin-wall bottle formed by stretch blow molding, wherein the carrying handle is formed with its arm portions extending across the both sides of the neck portion, enabled to rotate up and down with respective joining portions of base portions and the arm portion which are formed in symmetrical positions on both sides of the neck portion as its axis. This enables the change in the position of a gripping portion, which has been difficult in conventional integral forming, even in a bottle made of a material resin like PET resin which lacks in flexibility.

Abstract: A bottle with a hanging tool detachably provided. The hanging tool comprises a flat and long connection portion extending sideways from the neck portion and having a length shorter than an outer diameter of the bottom of the bottle, and a separately molded wide annular handle portion. The connection portion is provided at its intermediate portion with a narrow portion crossing the connection portion transversely to reduce a thickness thereof, thereby making the connection portion vertically bendable at the narrow portion, a free end of the connection portion and the handle portion are formed at their predetermined locations with joint portions comprising a pair of engagement means, and the handle portion is detachable attached to the connection portion. Thereby an injection mold for molding a preform can be simple in structure and is suppressed from being enlarged.

Abstract: A wide mouthed container of synthetic resins for a paint, wax and the like, formed thinly in the body portion thereof by injection stretch blow molding is provided. A mouth portion of the wide mouthed container is of large diameter and comprises an internal wall integral with a body portion having a bottom, a belt shaped external wall integrally formed on the outside of the internal wall via a joint portion of required width to be in H-shape, and an upper and lower annular grooves between both the walls sectioned by the joint portion. The body portion is stretch blow molded thinly from the underside of the internal wall to a position where the lower edge of the external wall touches the body portion to form the side surface of the body portion on the same level as said external wall and to form the lower annular groove into a hollow in the lower part of the mouth portion.

Abstract: A hermetic seal for sealing a mouth of a wide-mouthed bottle having a body portion thinly formed by stretch blow molding, and a wide-mouthed bottle a mouth of which is sealed by the hermetic seal. A synthetic resin laminated sheet comprising an aluminum sheet or an aluminum foil as a base is punched into the same shape as a mouth of the wide-mouthed bottle to form the hermetic seal. The sheet is formed into a flat peripheral portion and a bellows inside the flat portion to have alternate multiple mountain and valley portions by press molding concurrently with the punching.

Abstract: There is provided a handle comprising a grip portion 2 which is longitudinally long enough to extend from an upper edge to a lower edge of a recess 21 in a side portion of the bottle 20, an upper contact plate 4 which projects inward and obliquely downward from the bottom of a holding portion 3 provided on an upper end of the grip portion and has an engagement piece 6 projecting upward and facing the holding portion 3, and a lower contact plate 5 which is formed from a lower end of the grip portion, bent inward and obliquely upward and has an engagement piece 7 projecting downward at its distal end. A connection step portion 10 is formed in an upper end portion of the lower contact plate 5 and a fixing plate 9 having such a length that its distal end reaches the inside of the connection step portion 10 extends obliquely toward the grip portion by bending its connection portion with the upper contact plate 4.

Abstract: A method for injection molding polyethylene terephthalate by employing a vent type injection unit as means for omitting preliminary drying the resin, wherein the unit does not develop a poor screw biting, and even when the molding material is an undried uncrystallized or crystallized PET, can feed a certain amount of the material at all times to injection mold a desired transparent molded form such as a preform, and use the preform to produce a thin-wall container at a low cost.

Abstract: A molding method for continuously carrying out the steps from injection molding of a synthetic resin preform to orientation blow molding thereof into a thin-wall-hollow molded article, characterized in that releasing of the preform from the injection mold is carried out during the state where the shape thereof can be maintained by a skin layer produced at the surface by quick cooling and the state where internal cooling is not yet finished and the temperature is high, and orientation blow molding of the preform is carried out within a time till a surface temperature of the preform which rises by its own internal temperature reaches a peak temperature.

Abstract: A bottle with an ear obtained by orientation blow molding, in which a mounting portion positioned at a predetermined height has a large diameter and upper portion composed of an outer wall in the form of an injection molded flange and an inner wall oriented internally thereof and placed in close contact therewith. The mounting portion having a predetermined width in an outer periphery thereof, is formed below a mouth portion of the bottle by injection orientation blow molding. An upper edge of the mounting groove is formed to have an edge having a plurality of notches at equal intervals. A mounting ring is internally provided with a plurality of projecting surfaces positioned at the mounting groove through the notches and is formed integral with a bended end of an ear. The projecting surfaces of the mounting ring and the upper edge of the mounting groove are fitted with each other whereby the ear and the bottle are integrally connected.