A blow-molded unitary structure includes a panel having first and second panel walls and a generally hollow interior between the first and second panel walls. The structure also includes one or more different types of strengthening elements monolithically formed with the panel and across a substantial portion of the panel to enhance the strength of the structure. A strengthening element can be a depression recessing from the second panel wall toward an interior of the panel, a protrusion protruding from the second panel wall toward an exterior of the panel, a rib protruding outwardly toward the exterior of the panel and a trench formed by side walls of adjacent protrusions.

An Arrangement for transporting media, comprising a base body formed as a blow-molded part and at least one functional element, wherein the functional element is positively fixed to the base body, wherein the positive fit is formed by shaping the base body during blow molding, and a method for producing an arrangement.

A method for manufacturing an arrangement for the transport of media includes a base body formed as a blow-molded part and at least one functional element, in which a preform consisting of polymeric material and at least one functional element are provided and arranged in a blow mold, wherein the base body is formed from the preform, wherein the preform bears against the functional element during forming, wherein the blow mold has a first mold element and a second mold element, wherein the base body is formed from the preform between the first mold element and the second mold element, wherein the first mold element and the second mold element bear against the functional element in such a way that excess material produced from the preform in the area of the functional element during blow molding can be removed.

A method for manufacturing an arrangement for the transport of media includes a base body formed as a blow-molded part and at least one functional element, in which a preform consisting of polymeric material and at least one functional element are provided and arranged in a blow mold, wherein the base body is formed from the preform, wherein the preform bears against the functional element during forming, wherein the blow mold has a first mold element and a second mold element, wherein the base body is formed from the preform between the first mold element and the second mold element, wherein the first mold element and the second mold element bear against the functional element in such a way that excess material produced from the preform in the area of the functional element during blow molding can be removed.

The present invention provides an eco-friendly underwater buoy and a manufacturing method therefor, the underwater buoy comprising: a liner main body of which the inside is hollow; a winding member which is melt welded on the outer surface of the liner main body by winding, and which absorbs external shock; and buoy couplers embedded in both ends of the liner main body so as to couple adjacent underwater buoys to each other. The present invention winds, through filament winding, a wire, in which a glass fiber, a resin and the like are mixed, around the outside of a liner structure so as to manufacture an underwater buoy, and thus, since the underwater buoy is made of a composite material, the appearance of the buoy structure can be stably maintained for a long time without damage caused by various underwater shocks, so that underwater environmental pollution caused by buoy structure damage can be minimized, thereby maximizing the eco-friendliness of the underwater buoy.

A fuel tank manufacturing apparatus for a fuel tank, the fuel tank having therein a built-in component with a head portion, a neck portion, and a shoulder portion, and having the built-in component anchored to a tank body with a part of a parison wrapped around the neck portion during molding the tank body, includes: a pair of molding dies to have the parison transferred to the built-in component by blow molding; and shaping devices respectively provided in the pair of molding dies, wherein the shaping devices each include: an end surface to contact the parison; a recess provided in the end surface to receive the head portion and the neck portion and covered by the shoulder portion during molding; and an air hole provided in an area of a bottom surface of the recess corresponding to the head portion through which air pressure is applied toward the head portion.

A fuel tank manufacturing apparatus for a fuel tank, the fuel tank having therein a built-in component with a head portion, a neck portion, and a shoulder portion, and having the built-in component anchored to a tank body with a part of a parison wrapped around the neck portion during molding the tank body, includes: a pair of molding dies to have the parison transferred to the built-in component by blow molding; and shaping devices respectively provided in the pair of molding dies, wherein the shaping devices each include: an end surface to contact the parison; a recess provided in the end surface to receive the head portion and the neck portion and covered by the shoulder portion during molding; and an air hole provided in an area of a bottom surface of the recess corresponding to the head portion through which air pressure is applied toward the head portion.

An object of the present invention is to produce a double-sided carpet type skin-equipped hollow molded article so as to prevent degradation of aesthetic appearance of the hollow molded article. The double-sided carpet type skin-equipped hollow molded article includes: a hollow molded article main body made of a thermoplastic and having a front surface wall and a back surface wall; and skins integrally bonded to the respective front and back surface walls. A first skin bonded to the front surface wall is a napped-type skin. A second skin bonded to the back surface wall is a skin having a thickness smaller than a thickness of the first skin. A wall surface to which the first skin is bonded protrudes outward more than a wall surface to which the second skin is bonded in a parting line of the hollow molded article main body. The first skin has a large thickness and is a napped-type skin. Therefore, obtained is an effect that a nap raised after deburring and cutting masks a cut portion.

An object of the present invention is to produce a double-sided carpet type skin-equipped hollow molded article so as to prevent degradation of aesthetic appearance of the hollow molded article. The double-sided carpet type skin-equipped hollow molded article includes: a hollow molded article main body made of a thermoplastic and having a front surface wall and a back surface wall; and skins integrally bonded to the respective front and back surface walls. A first skin bonded to the front surface wall is a napped-type skin. A second skin bonded to the back surface wall is a skin having a thickness smaller than a thickness of the first skin. A wall surface to which the first skin is bonded protrudes outward more than a wall surface to which the second skin is bonded in a parting line of the hollow molded article main body. The first skin has a large thickness and is a napped-type skin. Therefore, obtained is an effect that a nap raised after deburring and cutting masks a cut portion.

A segment for a Scruton helix includes: a segment body, a coupling device on the segment body for coupling the segment to a further segment for the Scruton helix, a push-on device on the segment body for coupling the segment to a rope. Also disclosed are a system for a Scruton helix, a Scruton helix, a tower for a wind turbine, and a method for mounting a Scruton helix.