Abstract: A method of molding a preform in an injection stretch blow molding, wherein a gas is entered into the boundary between the preform and an injection core so that the gas pressure causes the preform in an injection mold to be insulated from the injection core, thereby allowing a high-temperature releasing of the preform.

Abstract: A composite molding device is provided at the same site for preforming a closed-end parison or controlling the temperature of the closed-end parison as well as stretch blow molding the preform or temperature-controlled parison to a final product, such as a bottle. The composite molding device applied for stretch blow molding includes a clamping device, a pair of first mold halves, and a pair of second mold halves. The pair of second mold halves are removably placed between the pair of first mold halves in the clamping device so as to use the clamping device as a common clamping device.

Abstract: A method enabling stretch blow molding in a temperature range preferable for polyethylene and capable of releasing at a surface temperature suited to both releasing of a preform and subsequent stretch blow molding, by disconnecting the core die and the preform in advance by the use of pressure of gas. The injection molding of a predetermined preform involves filling an injection mold with molten polyethylene, releasing the preform from the cavity die and core die of the injection mold while a mouth portion of the preform is held by the lip die, and transferring the preform into a blow die to stretch blow mold into a hollow molded thin wall product. Gas forcibly enters into the boundary of the core die and the preform, before releasing the preform from the injection mold to isolate the inside wall of the preform from the core die.

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.

Abstract: A rotary type injection orientation blow molding machine. A horizontal plate is vertically movably provided on a machine bed with portions of a peripheral edge thereof inserted into tie bars standing upright on the machine bed. A transfer plate is rotatably mounted on the underside of the base plate and has hold molds at these locations on the lower surface thereof. A drive device located in the central portion in the upper portion of the base plate intermittently rotates the transfer plate by a predetermined angle. A vertical clamping device and an injection mold with stop positons of the hold molds serve as an injection molding portion, an orientation blow molding portion and a releasing portion, respectively, a blow mold and orientation blow device, and a releasing device.