Abstract: A method for injection and blow molding products which includes five operations, i.e., injection molding, a temperature control, stretching and blow molding, a secondary working, and releasing operations at respective operating stations. Neck molds of the same number as that of the operating stations intermittently sequentially advance the blow molded product to each station. At the secondary work station, there are provided a reciprocatable injection mold disposed to be movable up and down, a temperature control member, a blow mold and a mechanism for opening and closing the blow mold, and operating mechanisms similar to an injection mold opening and closing mechanism, a temperature control mechanism, a stretching and blow mechanism and a molded product releasing mechanism on the base plate.

Abstract: A clamping mechanism which includes a cylinder and a piston. The diameter of the piston is less than the internal diameter of a rear chamber of the cylinder such that fluid flows around the piston when the piston moves from an open position to an intermediate position. The diameter of the piston is equal to the internal diameter of a front chamber of the piston such that fluid cannot flow around the piston when the piston moves from the intermediate position to a closed position. To prevent cavitation within the cylinder, fluid is charged to the cylinder in accordance with the movement of the piston.

Abstract: This invention relates to a rotary type blow molding machine which forms a working space between an intermittently rotatable transfer plate (14) above a machine bed having lip molds (15) at three locations on the lower surface thereof and the machine bed, the three locations on the machine bed of the working space forming three working stages, i.e.

Abstract: This invention relates, in a clamping device in which two sets of clamping plates, each set of which comprises a pair, are provided between a pair of fixed plates on a base plate connected by tie bars passing through the tie bars, blow molds in the form of a split mold are mounted on each set of clamping plates and two sets of blow molds are arranged open- and closably between the fixed plates, and a plurality of external clamping cylinders are provided in position of both the fixed plates, a clamping device for blow molds wherein a small hydraulic cylinder whose ram stroke is very short is employed as a clamping cylinder, a plurality of such small hydraulic cylinders are disposed between blow molds arranged in two rows and between the blow molds and fixed plates, and an opening and closing cylinder is disposed between the clamping plates, whereby the opening and closing and clamping of each of the blow molds are carried out.

Abstract: An injection molding method operable in conjunction with an injection molding machine having an injection screw which rotates and moves backward while a preset dosage of molding material is injected into the molding machine. As the injection screw moves backward its arrival at a predetermined point relative to a discharge nozzle is detected by a sensor which initiates stoppage of feeding of material into the machine. Further backward movement of the injection screw resulting from internal pressure in the injection cylinder is arrested by an adjustably locatable stopper, disposed behind the injection screw. The stopper is designed to be located at a position that produces molded products of consistent quality. Further, in accordance with a preferred embodiment of the invention, the stop position of the injection screw is also used as a starting point for the injection screw in a subsequent injection step during which the dosage of material is injected into a molding cavity.

Abstract: A method for molding double-layered preforms in an injection, stretching and blow molding machine. Plastic material is injected into a cavity formed by a mated inner preform and core mold and into another cavity formed by a mated outer preform, neck mold and a core mold carrying an inner preform to form respectively inner and outer preforms. The inner core mold is lifted, while carrying an inner preform, and moved over the outer preform mold. The outer core mold is lifted and the neck mold strips the double-layer preform formed by the injection of the outer preform onto the inner preform. The neck mold carrying the double-layer preform is moved away from alignment with the outer preform mold and advances the preform to heating, stretching and blow molding stages. Another neck mold is moved into alignment with the outer preform mold prior to lowering the core mold carrying the inner preform into the outer preform mold.

Abstract: The present invention provides a new injection molding machine in which a space left between a mold clamping device and an injection device provided on the machine base is utilized for installation of an electric box, and the electric box may be mounted on the machine base without particularly increasing the upper area of the machine base whereby reducing the installation area required for the molding machine.

Abstract: A molder for molding double-layered preforms in an injection, stretching and blow molding machine wherein a plurality of neck molds which also serve as a member for holding preforms and molded articles are mounted at given intervals on the undersurface of a transferring platen provided above a machine base and which is intermittently rotated so that the neck molds can be opened and closed, and devices required from injection molding of preforms to stretching and blow molding are disposed at stopping positions of said neck molds.

Abstract: The present invention provides an injection and blow molding machine which comprises a machine bed having five operating sections, i.e., an injection molding section, a temperature control section, a stretching and blow section, a secondary working and releasing section and a releasing section, a base plate mounted in a peripheral portion above and parallel to said machine bed, a rotary disk rotatably mounted on the under-surface of said base plate and having neck molds of the same number as that of the operating sections, and a drive means fixedly mounted on the central portion of the base plate to intermittently turn the rotary disk with respect to the respective operating sections. It is of course that between the rotary disk and the machine bed, there are provided an injection mold disposed movably up and down, a temperature control member, a blow mold and a mechanism for opening and closing the blow mold, which are disclosed in U.S. Pat. No.

Abstract: A temperature control blow molding equipment which has a temperature control mold and a blow mold on one seat body and which is used in an injection stretch blow molding machine comprising a disk-like moving plate intermittently rotatably disposed above a base disk, a plurality of neck molds provided at regular intervals under the carrying plate, and operation zones disposed at stop positions of the neck molds, the operation zones being necessary for a series of treatments from an injection molding of a parison to a removal of a molded article.

Abstract: In the process to form a plastic flat bottle by blowing air into an injection molded parison having a bottom, the injection blow molding method of the invention is characterized in that the thicknesses of the portions of the parison to form the front and rear faces of the flat bottle are made larger than the thicknesses of the portions of the parison to form the side end faces of the flat bottle, thereby enlarging the heat capacity in the former portions of the parison to form the front and rear faces than that of the portions of the parison to form the side end faces of the flat bottle so as to make the former portions of the parison to be expanded more easily.

Abstract: This invention provides a new molding method in which in molding a preform injection molded into a holding mold into a container having a wide opening by blow or vacuum molding, the preform may be held and locked by a holding mold and a core member or a container molding mold, and products may be easily removed merely by opening the holding mold in a horizontal direction.

Abstract: Plural mold cavity defining mold block with particular arrangement of bored and plugged conduits for heat transfer fluid. The molds being particularly useful in blow-molding.

Abstract: This invention relates to a rotary type injection molding machine in which plural sets of molds are set on a turntable provided on a machine bed, and molding of articles by injection of synthetic resins and releasing of molded articles are carried out at different positions. The molding machine is designed so that even if the mold is provided with a runner passage, the injection apparatus can be opposed to the clamping direction to cast the resins without being affected by the runner passage, and even in molding articles having threads internally thereof, a releasing means need not be provided for each mold.

Abstract: In accordance with the present invention, there is provided an injection stretching blow molding machine comprising a base secured onto a machine bed, a top plate positioned above said base and connected to said base by means of a plurality of tie rods in the peripheral edge, a movable plate slidably inserted through said tie rod and disposed movably up and down between the base and the top plate, a clamping plate above the movable plate, a transfer plate at the undersurface of said movable plate and rotable at predetermined intervals by a drive device provided in the central portion above the movable plate, the required number of hold molds consisting of split molds mounted on the undersurface of the transfer plate, said hold molds being opened and closed in a radial direction, an injection cavity and a blow cavity on the base closed in connection with said hold molds, an injection core and a blow core mounted at the lower side of said clamping plate and closed in connection with the hold molds from openings

Abstract: The present invention provides a mold-thickness adjusting apparatus in a clamping mechanism for molding synthetic resins in which a clamping plate is inserted into and mounted on a plurality of tie bars provided over a pair of fixed plates on a machine bed, wherein despite the mold-thickness adjustment is effected by a connecting portion between a clamping ram and a clamping plate, a positional movement of the clamping plate resulting from rotation can be done smoothly, and even if mutual threads are temporarily brought into close contact with each other due to the concentration of the clamping force on the connecting portion, members can be rotated after the close contact has been relieved.

Abstract: The invention discloses a method for injection molding a composite parison comprising the following first and second steps:a first step wherein neck molds mounted on a transport plate and a mold for a parison neck or an outer layer of the neck are brought together at a first molding station and molten resin is injected into a cavity formed in the neck mold to mold the outer layer of the neck of the parison, anda second step wherein said outer layer of the neck together with the neck molds are transported to a second molding station, the neck molds, the mold for the main parison portion and core molds are brought together at said second molding station while holding the outer layer of the neck to form continuous cavities extending over the inside of the outer layer of the neck, and molten resin different from the first mentioned molten resin is injected into said cavity to mold the main parison and at the same time mold an inner layer of a neck which is integral with said main parison portion and deposited wit

Abstract: This disclosure relates to a pressure resisting plastic bottle having a neck portion, a body portion and a bottom portion integrally formed of polyethylene terephtalate and comprising a bottom wall portion biaxially molecular oriented together with a body wall portion, an inwardly inclined outer peripheral wall portion, an inner peripheral wall portion turned back from the lower end of said outer peripheral wall portion toward the inside and a bottom wall central portion in the form of a convex curved surface formed continuous to the upper portion of the inner peripheral wall portion, whereby an angle .beta., included between the vertical and said outer peripheral wall portion is greater than an angle .alpha.included between the vertical and said inner peripheral wall portion.

Abstract: A molding machine disclosed herein comprises a rotary disk having a required number of neck molds attached to the under-surface thereof, said rotary disk being located under the base plate, rotary disk capable of being intermittently rotated to thereby successively transport the neck molds to an injection molding stage, a temperature control state and a molded article releasing stage for continuous operation from the injection molding of parisons to the releasing of hollow molded articles. The present invention is characterized in that blow molds and mold opening and closing mechanisms therefor disposed movably up and down in the stretching and blow molding stage are moved up at the stretching and blow molding whereas moved down at the transporting the parisons and hollow molded articles.

Abstract: An injection blow molding machine which is compact but effective in operation. The machine comprises: a machine bed being provided with an injection molding stage having an injection mold and a mold closing mechanism, a heating stage having a heating cylinders, a stretching and blowing stage having a stretching and blowing mechanism and a releasing stage having a molded product releasing mechanism; a base plate which is attached to and above the machine bed leaving a certain space; a rotary disk which is rotatably attached to the under-surface of the base plate; a motor secured to the middle portion on the base plate and interlocked with the rotary disk by an arm and a connecting pin. The invention is characterized in that the space between the machine bed and the base plate carrying the rotary disk is fully utilized for holding mold and other necessary parts.The questions raised in reexamination request No. 90/000,455, filed Oct.