A cooling plate assembly includes (a) a cooling plate having a plate front surface; (b) an air channel extending within a thickness of the cooling plate; (c) a plate bore extending into the cooling plate from the plate front surface for providing fluid communication between the air channel and a cavity of a cooling tube mountable to the cooling plate; and (d) a valve within the plate bore. The valve is movable between a first position in which a first air flow passage extending within the plate bore is open for conducting air from the cavity to the air channel, and a second position in which the first air flow passage is obstructed to reduce air flow between the cavity and the air channel, and in which a second air flow passage extending within the plate bore is open for conducting air from the air channel to the cavity.

A cooling plate assembly includes (a) a cooling plate having a plate front surface; (b) an air channel extending within a thickness of the cooling plate; (c) a plate bore extending into the cooling plate from the plate front surface for providing fluid communication between the air channel and a cavity of a cooling tube mountable to the cooling plate; and (d) a valve within the plate bore. The valve is movable between a first position in which a first air flow passage extending within the plate bore is open for conducting air from the cavity to the air channel, and a second position in which the first air flow passage is obstructed to reduce air flow between the cavity and the air channel, and in which a second air flow passage extending within the plate bore is open for conducting air from the air channel to the cavity.

An injection-molding method for manufacturing a sleeve (1) comprising a cylindroconical body comprising at least one deformable bellows portion (2) arranged in line with a base (3), by means of tooling comprising a mold (8) formed of at least two portions (81, 82) defining a mold cavity and a core that can be inserted into the mold cavity, and comprising a first cylindroconical portion (11) provided externally with a helical thread that is complementary to a helical thread of the mold (8) and a second portion (15) that is complementary to a recessed portion of the mold (8), said method comprises a step of filling the mold spaces left free between the core and the inside of the mold cavity (9), a step of opening the mold (8) during which, or at the end of which, the second portion (15) of the core is moved axially in a direction parallel to the winding axis (XX) of the threads of the helical thread going away from the first portion (11) of the core, and a step of driving relative turning movement of the sleeve (1) and of the first part (11) of the core.

The method for attaching a thin cylindrical element to a mold core is a method for attaching a film-like thin cylindrical element, which is formed in a cylindrical shape having a constant cross-sectional shape, to an outer surface of a mold core in a manner so as to cover the mold core. The method includes pressing the thin cylindrical element onto a tip portion of the mold core; guiding the thin cylindrical element to the base end side of the mold core while ejecting gas into between the mold core and the thin cylindrical element; and attaching the thin cylindrical element to the outer surface of the mold core in a manner so as to cover the mold core.

The method for attaching a thin cylindrical element to a mold core is a method for attaching a film-like thin cylindrical element, which is formed in a cylindrical shape having a constant cross-sectional shape, to an outer surface of a mold core in a manner so as to cover the mold core. The method includes pressing the thin cylindrical element onto a tip portion of the mold core; guiding the thin cylindrical element to the base end side of the mold core while ejecting gas into between the mold core and the thin cylindrical element; and attaching the thin cylindrical element to the outer surface of the mold core in a manner so as to cover the mold core.

An air ejector of a resin molding device includes air passages, air outlets through which air is injected, movable valves biased by bias members to close the air outlets, accommodation spaces in which the movable valves are movably contained, an air supply path through which air is supplied from an air supply source, and a pressure sensor to detect air pressure. After completing the mold removal, the air is supplied via the air supply path to the air passages at an air pressure smaller than the bias force of the bias members, and the air pressure is detected by the pressure sensor.

An air ejector of a resin molding device includes air passages, air outlets through which air is injected, movable valves biased by bias members to close the air outlets, accommodation spaces in which the movable valves are movably contained, an air supply path through which air is supplied from an air supply source, and a pressure sensor to detect air pressure. After completing the mold removal, the air is supplied via the air supply path to the air passages at an air pressure smaller than the bias force of the bias members, and the air pressure is detected by the pressure sensor.

The present invention provides a die assembly for molding a resin-made insert having a sleeve that is inserted into an intake port of an internal combustion engine. Each sleeve has one inlet and two outlets. The die assembly includes an inner die and an outer die. The inner die includes an inlet side part and an outlet side part. The inlet side part and the outlet side part mold an inner peripheral surface of the sleeve in an assembled state, and are removed in mutually opposite directions. By means of this assembly, a sleeve having a complicated structure and shape can be molded easily.

The invention relates to a dart head for a toy dart, comprising a body having a hollow stem portion integrally formed with and longitudinally extending from an enlarged, hollow head portion; the head portion and the stem portion being fluidly connected, with the head portion defining at least one first transverse internal head dimension, and the stem portion defining at least one first transverse internal stem dimension; wherein the at least one first transverse internal head dimension is larger than the at least one first transverse internal stem dimension. The invention also relates to a toy dart comprising a dart body connectable with the dart head as described, and a method of manufacturing the dart head as described.

[Problems] The objective of present invention is to provide the mold, injection molding system and method capable of limiting the outflow of pressurized fluid injected into a mold cavity.

[Solution] A mold device and a molding device comprising: a shaft body 27 provided at least on one mold among a first mold 205 and a second mold 206 that form a molding space 200, the shaft body being used for pushing out a molded article formed from a resin injected into the molding space 200; a ring-shaped elastic member for supporting the shaft body 27 in which an opening formed along the circumferential direction is oriented toward the said molding space; and an injection portion provided on at least one mold among the first mold 205 and the second mold 206, the injection portion being used for injecting a pressurized fluid into the molding space 200.