A cylinder that kneads an injection material, a heat insulating cover that covers a side surface of the cylinder, the heat insulating cover including a first end portion and a second end portion, a heater arranged between the heat insulating cover and the cylinder, the heater heating a first region of the cylinder, and a first heat pipe that thermally connects the first region and a second region to each other, the second region being different from the first region, are provided. The heat insulating cover includes the first end portion and the second end portion through which the injection material passes, and the first region is closer to a midpoint between the first end portion and the second end portion than the second region.

An injection unit comprises an injection cylinder, heaters that are attached to side surfaces of the injection cylinder along an axial direction of the injection cylinder, and heat-retaining components that cover at least a part of outer circumference surfaces of the heaters in the axial direction. The injection cylinder comprises supply sections to which an injection molding material is supplied, a compression section that compresses the injection molding material, and measurement sections that measure the amount of a compressed injection molding material. Heat retention for the heaters in the compression section is lower than heat retention for the heaters in the supply sections and heat retention for the heaters in the measurement sections.

An injection molding system includes a molding device, an inspection device configured to inspect a molded product and a control device that includes a storage unit, and a reception unit configured to receive a change content of a parameter included in a standard molding condition. The control device executes a first control of forming the molded product under a second molding condition in which the parameter is changed based on the change content, a second control of forming the molded product under a third molding condition in which the same parameter is changed, a third control of associating the second molding condition with an inspection result of the molded product formed under the second molding condition and storing the association, and a fourth control of associating the third molding condition with the inspection result of the molded product formed under the third molding condition and storing the association.

An injection molding machine heats an injection nozzle using, as a target temperature, a detected temperature of a synchronization zone, when a detected temperature of the injection nozzle is lower than a nozzle reference temperature. The injection molding machine heats the injection nozzle using a nozzle set temperature as a target temperature, when a detected temperature of the injection nozzle is higher than the nozzle reference temperature.

An injection molding machine includes a heating cylinder provided with a gas inlet, a screw, a gas cylinder, a pressure reducing valve configured to reduce a primary pressure of a gas from the gas cylinder to a secondary pressure, a gas supply portion configured to supply the gas at the secondary pressure to the gas inlet, a secondary pressure detection device configured to detect the secondary pressure, and a controller. The controller is configured to detect an abnormality by comparing a set pressure set in advance in the injection molding machine with the secondary pressure.