Abstract: A resin molding is made by integrally joining a first resin molded part configured with a concave portion and a second resin molded part configured with a convex portion so that the concave portion and the convex portion are mated together. The resin molding includes a cavity that is in communication with the convex portion and the concave portion when the convex and concave portions are mated into each other, and a joining resin filled into the cavity. The first and second molded parts and the joining resin are composed of the same resin or similar resins.

Abstract: A method of manufacturing a resin molding according to the present invention is made by joining first and second resin molded parts. The method includes molding a concave portion when molding the first part, molding a convex portion which has a through-hole in a central portion thereof when molding the second part, mating the concave portion with the convex portion so that a cavity being in communication with one end of the through-hole is configured between the concave and convex portions, holding, with a jig, the first and second parts which the cavity is configured therebetween, connecting a tip of an injection nozzle for injecting a molten resin into the cavity with the other end of the through-hole, and filling the molten resin into the through-hole and the cavity from the injection nozzle so that the concave and convex portions are integrally joined by the resin.

Abstract: A resin injecting apparatus includes a resin injecting nozzle for injecting a molten resin into a cavity configured between a first resin molded part and a second resin molded part connected to the first molded part, from a through-hole configured in the second molded part, and an ejection plunger for ejecting a predetermined amount of molten resin from the resin injecting nozzle. In addition, a thermal insulating bush is attached to the resin injecting nozzle, a coolant passage is formed in the thermal insulating bush and through which a coolant is passed, and a coolant supplying unit supplies the coolant to the coolant passage.

Abstract: A resin molding is made by integrally joining a first resin molded part configured a concave portion and a second resin molded part configured a convex portion so that the concave portion and the convex portion are mated together. The resin molding includes a cavity that is in communication with the convex portion and the concave portion when the convex and concave portions are mated into each other, and a joining resin filled into the cavity. The first and second molded parts and the joining resin are composed of the same resin or similar resins.

Abstract: A method of manufacturing a resin molding according to the present invention is made by joining first and second resin molded parts. The method includes molding a concave portion when molding the first part, molding a convex portion which has a through-hole in a central portion thereof when molding the second part, mating the concave portion with the convex portion so that a cavity in communication with one end of the through-hole is configured between the concave and convex portions, and holding, with a jig, the first and second parts which the cavity is configured therebetween. Additional steps include connecting a tip of an injection nozzle for injecting a molten resin into the cavity with the other end of the through-hole, and filling the molten resin into the through-hole and the cavity from the injection nozzle so that the concave and convex portions are integrally joined by the resin.

Abstract: A method of manufacturing a resin molding according to the present invention is made by joining first and second resin molded parts. The method includes molding a concave portion when molding the first part, molding a convex portion which has a through-hole in a central portion thereof when molding the second part, mating the concave portion with the convex portion so that a cavity being in communication with one end of the through-hole is configured between the concave and convex portions, holding, with a jig, the first and second parts which the cavity is configured therebetween, connecting a tip of an injection nozzle for injecting a molten resin into the cavity with the other end of the through-hole, and filling the molten resin into the through-hole and the cavity from the injection nozzle so that the concave and convex portions are integrally joined by the resin.

Abstract: The object of the invention is, in integrating two or more types of resin materials having different compositions or tones in a mold, thus molding a multi-color, multi-material molded article, to increase the strength of the bonding surfaces of the resins. To achieve this object, this invention provides an injection molding method of injecting two or more types of resin materials having different compositions or tones into a mold, thus producing a molded article in which the two or more types of resin materials are bonded. Convexo-concave shapes are formed on the bonding portions of the two or more types of resin materials.

Abstract: This invention has as its object to provide a composite molded product in which the second and subsequent members can be easily separated from the first member. In order to achieve this object, in the composite molded product made of a plurality of types of resin materials, materials that are not miscible with each other are used as the plurality of types of resin materials. Portions (1, 3) made of different resin materials can be separated from each other.