A method of partially insulating an interior space of a pre-formed fluted core panel is disclosed herein. The fluted core panel includes a first facesheet, a second facesheet spaced apart from the first facesheet, and webs between the first facesheet and second facesheet. The interior space is defined between the first facesheet, the second facesheet, and adjacent webs. The method includes positioning a spacer in a first portion of the interior space, positioning a membrane between the spacer and a second portion of the interior space, and positioning insulation in the second portion of the interior space. Additionally, the method includes pressing the membrane against the spacer, curing the membrane, and removing the spacer from the first portion of the interior space.

The present invention relates to a device for producing a reinforcing structure, which comprises a fiber-reinforced strip having a thermoplastic material, onto a molded body surface. The device is characterized in that emission direction vectors of at least two laser diodes of a laser diode array are aligned in a non-parallel manner to one another and are directed toward one another in the direction of a heating surface of the strip and/or the molded body surface.

Provided herein are polymer matrix composites, articles including the polymer matrix composites, and methods of forming the polymer matrix composites. The polymer matrix composite includes a stitched composite and a hybrid barrier layer incorporated within the stitched composite, the hybrid barrier layer including a thin ply and a nanographene dispersed resin. The article includes a high-pressure composite cryogenic tank including the polymer matrix composite. The method includes positioning a dry thin ply between composite plies, stitching the composite plies to form a stitched preform, dispersing nanographene into the resin, and infusing the stitched preform with the modified resin.

Provided is a method for producing a high-pressure tank that is capable of suppressing entry of a resin in a stiffener layer into the boundary between a liner body and a mouthpiece, and also offers excellent productivity. The method for producing a high-pressure tank includes disposing a resin sheet on a liner body having a mouthpiece, the resin sheet covering a gap between an outer circumferential portion of the mouthpiece and the liner body, and heating the resin sheet and welding the resin sheet to the mouthpiece and the liner body, to make a liner; and forming a fiber layer around the outer circumference of the liner, the fiber layer being impregnated with a resin, and curing the resin, wherein the softening point of a material constituting the resin sheet is higher than the maximum temperature that is reached by the liner due to heating of the resin.

A high-pressure tank comprises a liner, a strengthening layer including a first helical layer and a first hoop layer each including a carbon fiber, and a protective layer including a second helical layer and a second hoop layer each including a glass fiber, in this order. The high-pressure tank is provided with a stress-generating portion, a reinforcement layer includes a first area α overlapping the stress-generating portion in a stacking direction and a second area β that is an area except for the first area, and a one-round portion including a final crossing portion at an end of winding of the glass fiber constituting the second hoop layer overlaps the second area in the stacking direction.

The high pressure tank includes a liner, a hoop layer, and a helical layer. The liner includes a cylindrically-shaped trunk portion and dome portions disposed on both ends in an axial direction of the trunk portion. In the hoop layer, a fiber impregnated with a resin is wound in hoop winding and laminated to cover the trunk portion. In the helical layer, a fiber impregnated with a resin is wound in helical winding and laminated to cover at least the dome portions. An interface strength between the fiber and the resin on the hoop layer covering the trunk portion has a low fatigue strength and a high tensile strength compared with an interface strength between the fiber and the resin on the helical layer covering the dome portions.

The invention relates to a method for the manufacture of a leak-tight vessel comprising a cylindrical mantle and two dome-shaped ends for the storage of a gas and/or a liquid. The method comprises providing an inner barrier layer comprising a heat-sealable thermoplastic material and an outer shell layer comprising a fiber-reinforced heat-sealable thermoplastic material, as well as an end-fitting. Further, the method comprises providing an inner layer by winding a heat-sealable thermoplastic filament material and forming an outer layer in two steps: first providing around the mantle of the vessel a fabric of a fiber-reinforced heat-sealable material, whereby the width of the fabric diminishes with successive windings of the fabric around the mantle, followed by winding a fiber-reinforced heat-sealable plastic film over the fabric around the mantle and the dome-shaped endings.

A composite pressure vessel that includes a monolayer liner and a reinforcing structure arranged on top of the liner. The liner is made by injection moulding and includes at least two shells weldable together. Each shell is made of a polymer composition including at least 45% by weight of an aromatic polyamide relative to the total weight of the polymer composition, and at least 10% by weight of an aliphatic polyamide relative to the total weight of the polymer composition.

A filament winding apparatus winds, around a workpiece, a fiber bundle formed by bundling a plurality of fibers. The filament winding apparatus includes a widening roller that rotates while making contact with the fiber bundle that is being conveyed. The widening roller has, provided on the peripheral surface, a plurality of projecting ridges extending in the axial direction, the projecting ridges being arranged side by side in the circumferential direction. The projecting ridges make contact with the fiber bundle to thereby widen the fiber bundle.

A pressure vessel includes a liner including a cylinder part and side parts provided at both ends of the cylinder part, each side part having a dome shape, and a carbon fiber layer including a first hoop layer surrounding a part of an outer circumferential surface of the cylinder part and second hoop layers surrounding other parts of the outer circumferential surface of the cylinder part, each of the second hoop layers having a thickness different from a thickness of the first hoop layer.