NISSEI ASB MACHINE CO., LTD.

A temperature adjustment mold capable of performing local temperature adjustment in an axial direction from the inside of a preform while restricting shrinkage and deformation of the preform, for adjusting a temperature of an injection-molded bottomed resin-made preform includes a rod portion inserted into the preform and extending in the axial direction of the preform. The rod portion includes an annular projection portion that protrudes in a radial direction of the rod portion and contacts an inner peripheral surface of the preform. The rod portion contacts a bottom portion of the preform to restrict shrinkage in the axial direction of the preform. The projection portion restricts shrinkage in a radial direction of the preform, conducts heat between the rod portion and the preform, and adjusts a temperature at a predetermined part in an axial direction of the preform.

An operation abnormality detection method for detecting an operation abnormality in a molding device having a movable part includes: acquiring a prescribed measured value relating to operation of the movable part and calculating, as statistical information, an average value of prescribed information values based on the prescribed measured values: calculating a first threshold and a second threshold; acquiring a current measured value and comparing a current information value based on the current measured value with the greater of the first threshold and the second threshold; and issuing a warning if the current information value at least exceeds the greater of the first threshold and the second threshold.

A method of producing a resin container includes injection-molding a resin intermediate molded body of bottomed cylindrical shape as a first injection-molding, injection-molding a resin material outside the intermediate molded body as a second injection-molding, to produce a multilayer preform in which a resin layer is layered on an outer peripheral side of the intermediate molded body, and blow-molding the preform in a state of containing residual heat from injection-molding to produce a resin container having a bottom portion thicker in wall thickness than a body portion. A portion of the inner peripheral side of the intermediate molded body, the portion reaching a bottom portion of the intermediate molded body, has a tapered region in which the wall thickness increases toward the bottom portion.

A blow molding mold in which a holding mechanism is independently provided to a bottom mold and is configured to be capable of gripping a protruding portion provided to a bottom portion of a preform independently of a gate portion, and a rotation mechanism is configured to be capable of rotating the bottom mold, relative to a neck portion of the preform which is in a stationary state held by neck molds, in a state where the protruding portion is gripped by the holding mechanism.

A manufacturing method includes an injection molding process of injection-molding a preform having a two-layer structure including an outer layer preform and an inner layer preform, and a blow molding process of blow molding the preform to mold a delamination container made of resin. The injection molding process includes an outer layer molding process of filling an outer layer injection mold with PET (outer layer resin material) to mold the outer layer preform and molding a thin film portion in a part of the outer layer preform, and an inner layer molding process of injecting PP (inner layer resin material) toward the thin film portion to break the thin film portion and filling an inner layer injection mold with PP having a temperature lower than a melting point of PET via the broken thin film portion to mold the inner layer preform.

A cooling mold for cooling a resin preform that has a gate portion protruding outward from a center of a bottom portion, in which an accommodating space that accommodates the preform is formed in the cooling mold, a bottom region facing the bottom portion of the preform in the accommodating space has a shape following the bottom portion of the preform, and an air sucking hole for sucking air is formed in the bottom region at a position shifted from the center of the bottom portion of the preform. In the accommodating space, a region facing a body portion of the perform and a bottom region facing the bottom portion of the perform are formed as a single member.

There is provided a mold unit for cooling a preform that has been injection-molded, the preform having a bottomed shape and made of a resin, the mold unit including a core mold having an outer shape corresponding to an inner shape of the preform, and being insertable into the preform, in which a flow path for a temperature adjustment medium extending in an axial direction of the core mold is formed inside the core mold, the flow path is formed at a position displaced in a circumferential direction of the core mold, and a position of the flow path is adjustable in the circumferential direction.

A blow molding mold unit includes a pair of blow cavity split molds for forming a blow cavity, the blow cavity defining a shape of a side surface of a resin container, a bottom mold, and a jig configured to integrally support the pair of blow cavity split molds and the bottom mold. In a case where a direction extending from a shoulder portion or a body portion to a bottom portion of the resin container defined by the blow cavity is defined as a first direction, a direction in which the pair of blow cavity split molds are opened is defined as a second direction, and a direction orthogonal to the first direction and the second direction is defined as a third direction, the jig is provided at an end of the blow molding mold unit in the third direction.

A control method for a mold opening/closing device including a hydraulic cylinder that opens and closes a mold, a hydraulic drive device that drives the hydraulic cylinder by supplying a hydraulic oil, and a controller that controls the hydraulic drive device, wherein the controller changes speed change in a deceleration region, in which movement of the hydraulic cylinder is decelerated, between a first half portion and a second half portion of the deceleration region, and causes speed change rate per unit time in the second half portion to be smaller than in the first half portion.

A manufacturing method includes an injection molding process of injection-molding a preform having a two-layer structure including an outer layer preform and an inner layer preform, and a blow molding process of blow molding the preform to mold a delamination container made of resin. The injection molding process includes an outer layer molding process of filling an outer layer injection mold with PET (outer layer resin material) to mold the outer layer preform and molding a thin film portion in a part of the outer layer preform, and an inner layer molding process of injecting PP (inner layer resin material) toward the thin film portion to break the thin film portion and filling an inner layer injection mold with PP having a temperature lower than a melting point of PET via the broken thin film portion to mold the inner layer preform.