Abstract: A hollow body molding device having molten resin injected into a main cavity, fluid is pressure-injected through a pressure port after the injection of molten resin, a floating core moves to the outlet side, the molten resin is extruded from the outlet simultaneously with the movement of the floating core, and a hollow molded body is molded, the hollow body molding device having a floating core storage portion connected to the main cavity and stores the floating core moved by the pressurized fluid, an auxiliary cavity stores molten resin discharged from the main cavity and the floating core storage portion, communication passages and which communicate the floating core storage portion and the auxiliary cavity with each other; and an opening and closing means that opens and closes the communication passages by sliding movement. In the hollow body molding device, each inlet cross-sectional area B of the communication passages is specified.

Abstract: The present invention provides a hollow body molding device which allows easy confirmation of passage of a floating core through a molded body and facilitates quality control at the site.

Abstract: A resin molded body can give a heat-insulating or radiation function of providing extremely good heat transfer, has high reliability, and is manufactured with a simple process at low cost. The resin molded body is formed by integrally injection molding of a pipe portion (1), which has at least a curved portion (3) and passes a fluid therethrough, and a flat plate portion (4).

Abstract: In a resin heat exchanger unit, a resin pipe having straight portions and curved portions and a plurality of resin fins are integrally molded and there can be realized high reliability, high heat exchange efficiency, and a simple manufacturing process. The resin heat exchanger unit includes a resin pipe (1), which has straight portions (2) and curved portions (3) provided alternatively and continuously, and a plurality of resin fins (4) connected to the pipe (1), the pipe (1) and the fins (4) being integrally injection-molded.

Abstract: In an electro-photographic photosensor wherein amorphous silicon as a photoconductive layer is formed on the surface of an aluminum base which has been processed to be alumite layer consisting of a porous layer and barrier layer, amorphous silicon is formed directly on the surface of the porous layer in which porosities is remained by the elimination of the process of sealing porosities. Further, when aluminum is processed by electrolyzation to be alumite, thickness of the barrier layer and the porous layer are appropriately set to provide good adhesive strength of amorphous silicon to the aluminum base and good electrostatic characteristics by adjusting respectively a voltage and duration of the electrolyzation.