There is provided a fuel tank including: a tank main body that stores fuel at an interior and has a pair of wall portions that face one another; and a supporting pillar that spans between the pair of wall portions, wherein the supporting pillar includes a shaft portion that is disposed with an axial direction thereof being a direction in which the pair of wall portions face one another, a pair of flange portions that extend-out toward a radial direction outer side of the shaft portion from axial direction both end portions of the shaft portion, and that are joined to the pair of wall portions, and plural ribs that are formed at a periphery of the shaft portion, and that span between the shaft portion and the pair of flange portions, and that have weak portions that are weakened locally.

A method for manufacturing a plastic fuel tank including: a) inserting a plastic parison including two distinct parts into an open two-cavity mold; b) inserting a core, bearing at least part of a reinforcing element configured to create a link between the two parison parts, inside the parison; c) pressing the parison firmly against the mold cavities, for example by blowing through the core and/or creating suction behind the cavities; d) fixing the part of the reinforcing element to at least one of the parison parts using the core; e) withdrawing the core; f) closing the mold, bringing its two cavities together to grip the two parison parts around their periphery to weld them together; g) injecting a pressurized fluid into the mold and/or creating a vacuum behind the mold cavities to press the parison firmly against the mold cavities; and h) opening the mold and extracting the tank.

Provided is a fuel tank which allows effective suppression of the deformation of a fuel tank body and has excellent durability. This fuel tank is equipped with: a fuel tank body; connecting members which partially connect the opposed inner wall surfaces of the fuel tank body to each other, and/or abutment portions where the opposed inner wall surfaces of the fuel tank body partially abut on each other; and reinforcing members which are provided integrally with the outer wall surfaces of the fuel tank body and reinforce the outer wall surfaces. The fuel tank is configured such that the reinforcing members are equipped with: base portions which are disposed at positions corresponding to the connecting members and/or the abutment portions; and extension portions which extend along the outer wall surfaces from the base portions.

A fuel tank has a built-in component with a head portion, a neck portion, and a shoulder portion, and has the built-in component anchored to a tank body with a parison wrapped around the neck portion during molding. The fuel tank includes a deformation prevention structure configured to prevent a wrapping parison portion wrapped around the neck portion from being deformed due to pressure acting on the tank body. The deformation prevention structure is configured to include one of a stepped portion provided in the shoulder portion, a convex portion, and a recess.

A hollow container producing device for producing a hollow container using a pair of parison sheets is provided. The hollow container producing device includes a pair of molds; an intermediate frame to be clamped to the pair of molds; and a transport unit that carries the intermediate frame and a pair of parison sheets to a position between the pair of molds, with the pair of parison sheets being respectively held on opposite sides of the intermediate frame.

Operating fluid container made of thermoplastic for a motor vehicle, with the following features: the operating fluid container has two openings in opposite container walls of the operating fluid container, and a stiffening element extending through both openings; and two stiffening element ends engage behind the container walls from the outside, such that the stiffening element counteracts a deformation caused by internal pressure of the operating fluid container, wherein the operating fluid container is characterized by the following features: a stabilizing element is arranged between at least one stiffening element end and a container wall; the stabilizing element has a through-opening through which the stiffening element extends; the stabilizing element has a first and a second thermoplastic; and the stabilizing element is welded to a container wall.

A fuel tank structure including: a fuel tank that is made of resin, and that is structured to include an upper wall portion and a lower wall portion; a supporting pillar portion that is made of resin, that is provided at an inner side of the fuel tank, that has one end portion welded to the upper wall portion and another end portion welded to the lower wall portion, and that connects the upper wall portion and the lower wall portion in a vehicle vertical direction; a sub-cup that is disposed at the inner side of the fuel tank; an urging portion that urges the sub-cup toward the lower wall portion; and a restricting portion that is provided at the supporting pillar portion, and that restricts relative displacement of the sub-cup with respect to the fuel tank in directions orthogonal to the vehicle vertical direction.

A resin panel according to an embodiment includes a core material, a reinforcing material, a skin material covering the core material and the reinforcing material, and a fastened member. A reinforcing material has a first plate provided on a front surface of the core material, a second plate provided on a back surface of the core material, and a connecting plate connecting the first plate and the second plate. The fastened member is attached to the skin material by a fastening member penetrating the skin material and the first plate or the second plate of the reinforcing material.

Moving servo motors of molds in synchronization with the operations of platens which enables fine patterns or shapes to be formed even on a large molded article. A mold clamping device forms patterns or the like on a molded article by detecting a mold position of a second platen among first, second, third platens with digital mold opening/closing position detector, and driving servo motors for molds of the molds in synchronization with a digital mold opening/closing position signal from the digital mold opening/closing position detector.

A resin panel of which contact surfaces of a rear wall to be in contact with another member are made unlikely to deform while reducing the weight of the resin panel. The panel includes a rear wall having a plurality of contact surfaces to be in contact with another member, and a front wall opposing the rear wall with an interval therebetween, the resin panel including a plurality of ribs obtained by indenting parts of the rear wall toward the front wall and welding the parts to an inner surface of the front wall, wherein a wall thickness of the front wall is generally equal to or smaller than a wall thickness of the rear wall.