An injection molding apparatus includes a first upstream mold having a first gate opening into which a first molding material flows, a second upstream mold having a second gate opening into which a second molding material flows, a first injection unit injecting the first material through the first gate opening, a second injection unit injecting the second material through the second gate opening, and a downstream mold clampable with each of the first and second upstream molds. The second material is injected by the second injection unit after the first material is injected by the first injection unit. The second gate opening is separated further from the downstream mold than the first gate opening, and a volume of a second cavity partitioned by the second upstream mold and the downstream mold is larger than that of a first cavity partitioned by the first upstream mold and the downstream mold.

A method for manufacturing a long-length resin molded body using a liquid crystal polyester is provided. The method includes injecting a resin composition containing the liquid crystal polyester via a gate into a cavity of a mold and filling the cavity with the resin composition. The mold cavity has a shape corresponding with the resin molded body and a gate is provided in a position where the distance from an end edge of the cavity in a long-length direction of the cavity is not more than 10% of the length of the long-length direction. The ratio of the length of the long-length direction relative to a length of a short-length direction of the cavity is two or greater. The length of the long-length direction is 200 mm or greater. A thickness of the cavity is at least 0.5 mm but not more than 3.0 mm.

An object of the present application is to allow a first cavity mold and a second cavity mold to become integrated with each other in a state in which the first cavity mold constituting an injection cavity mold is inserted into an insertion hole of the second cavity mold, with a cooling flow path for supplying a cooling medium formed between the first cavity mold and the second cavity mold.

A main body portion is disposed at a regular position by inserting a protrusion into an engaging portion formed in a leg portion of the main body portion in accordance with a forward movement of a sliding mold including the protrusion. Then, an injection molding mold is completely closed to cause at least a part of a mold surface of the sliding mold to come into contact with the main body portion.

A molding method for a synthetic resin molding reduces a disturbed flow of molten resin at a side edge of a molding body during injection molding, and allows the design surface of the molding body to have aesthetic appearance. The synthetic resin molding includes a bend arranged on a side edge of the molding body and bending toward its back surface, and a flange protruding laterally from the bend and including a notch. The molding method includes arranging a gate at a position corresponding to an end of one side of the flange in a longitudinal direction and performing injection molding using a colored resin material containing a luster agent kneaded in the material, and forming a thin portion of the bend in a longitudinal direction of the bend to form a groove on a back surface of the bend.

A plate-shaped molded body manufacturing method is provided. The manufacturing method involves a step of injection-molding a liquid crystal polymer resin composition using a mold that satisfies the following conditions (i) to (iii). (i) The mold includes a cavity and a gate that is connected to the cavity, the cavity has a shape that corresponds to the plate-shaped molded body, and the gate is provided across approximately an entire width of one side of the cavity. (ii) The mold includes a runner that is connected to the gate, and the runner extends along approximately an entire width of the gate. (iii) In a cross section perpendicular to an extension direction of the runner, a shape of an inside space of the runner has a wedge-shaped portion in which a width of the inside space gradually decreases toward the gate.

Provided is an injection molding device, including an injection port arranged on an upper mold base; an upper mold arranged in the upper mold base, wherein at least one ejection port, a gasket groove and a gasket are provided and the ejection portion is connected to the injection port; a lower mold base operatively aligned with or separated from the upper mold base and provided with at least one gas passage for the gas to enter or exit; and a lower mold disposed on the lower mold base. The lower mold base is aligned with or separated from the upper mold base, the lower mold is provided with a mold cavity and at least one shaped air path is provided to connect the mold cavity with the gas passage. The lower mold is a porous material and has a plurality of pores. Gas is pre-injected into the mold cavity through the gas passage and at least one air path to maintain a preset pressure inside the mold cavity. Gas is spewed out through the plurality of pores, thereby causing a finished product to exit the mold cavity. In addition, the present disclosure also provides an injection molding method.

An injection-molding process and an apparatus for making a multi-component hollow article, and the article made thereby. The process comprises molding, from a first plastic material, a hollow body having a wall with at least one vent therethrough and at least one flap molded in an area adjacent to the vent. The flap is molded in a first position in which the vent is open. The flap is hingedly movable from the first position to a second position in which the vent is closed by the flap. After the flap is folded into the second position, the hollow body, including the folded flap, is at least partially overmolded with a second plastic material, wherein the second material is essentially precluded from leaking into the hollow body through the vent. The apparatus comprises a first mold bar for molding a hollow body, a second mold bar for overmolding the hollow body with a second plastic material, and a closing tool for moving, and optionally retaining, the flap in the second position. The resulting article has no second material inside its hollow body.

A steering wheel damper for a vehicle, and a manufacturing method thereof, the method includes putting a plate which is directly fixed to a steering wheel and has a plurality of through holes and a mass member having a predetermined weight to reduce vibration and a central pin in a mold in order, injection-molding rubber, and molding a connection member for connecting the plate and the mass member and a cushion member for limiting movement of the mass member. Therefore, the steering wheel damper and the manufacturing method thereof can simplify the manufacturing process, improve productivity, and enhance durability and marketability since the plate, the mass member and the connection member are firmly coupled and movement of the mass member is limited so that the mass member does not collide with surrounding components while the vehicle is shaken.

A process for molding one or more bottle preforms, wherein molten plastic is injected into at least one molding cavity; and wherein air is drawn from the at least one molding cavity, through at least one channel for the air to pass from the at least one molding cavity towards the outside of the molding device, by means of suction means; and apparatus and device for performing such a process.