The present disclosure relates to a foldable honeycomb structure widely used as an industrial material, a landscape material, and a building material, and a manufacturing method therefor. More specifically, the present disclosure relates to a foldable honeycomb structure and a manufacturing method therefor, wherein a foldable honeycomb structure capable of being folded and unfolded is easily produced using a readily foldable film or sheet made of a plastic material, paper, a metal material, or a non-metal material, instead of prior art molding or extrusion methods.

An elongate hollow structure and method of constructing the hollow structure is described, whereby the hollow structure includes a radially inner portion and a radially outer portion adapted to be merged together to form a tubular wall structure. The method includes providing the radially inner portion, providing the radially outer portion about the radially inner portion, wherein a space exists between the radially inner and outer portions, the space containing a gas therein, and expanding the inner portion. The gas within the space between the inner and outer portions is arranged to be expelled as the inner portion is expanded.

A method of manufacturing an aircraft component, the component comprising a pair of covers joined by a pair of spars. The covers and spars form a closed box structure with four corners, each corner providing a transition between one of the covers and one of the spars. The method comprises: laying up a laminated sheet of fiber plies; and after the sheet has been laid up, folding the sheet to form the four corners and then joining the sheet to itself to provide the closed box structure.

The invention relates to a multilayer tube, comprising a tubular inner film made of modified polytetrafluoroethylene, and one or more layers of a planar textile fibrous material, which is saturated with a curable resin, and optionally an outer film. The outer film is preferably made of UV impermeable material. The multilayer tube can be used for repairing pipes, but it can also be used as a stand-alone pipe for transporting fluids such as liquids and gases.

An object of the invention is to provide a method of manufacturing a three-dimensional fluid cell having three-dimensional formability with a high degree of freedom. A method of manufacturing a three-dimensional fluid cell according to the invention is a method of manufacturing a three-dimensional fluid cell using a laminate which has at least two plastic substrates and a fluid layer and in which at least one plastic substrate is a heat-shrinkable film satisfying a heat shrinkage rate of 5% to 75%, including, in order: 1) an arrangement step of arranging one plastic substrate, the fluid layer, and the other plastic substrate in this lamination order; 2) a two-dimensional fluid cell producing step of producing a two-dimensional fluid cell by sealing the fluid layer; and 3) a three-dimensional processing step of three-dimensionally processing the two-dimensional fluid cell by heating.

A method for producing a tube skirt for a flexible tube, said tube skirt being manufactured from a flat strip 1 comprising a decorative film 15 superimposed on a primary film 16, said primary film 16 comprising a sealable inner layer 14 at the lower surface 20 of the strip 1 as well as two stabilizing layers 11, 13, said decorative film 15 comprising a sealable outer layer 7 at the upper surface 19 of the strip 1, and a decorative layer 8, 9.

This method comprises the following steps: winding the flat strip 1 into the form of a sleeve to shape the tube skirt; superimposing a first side border 2 of the strip 1 on a second side border 2 of the strip 1 to form an overlapping area 3, the sealable inner layer 14 of the primary film 16 of the first side border 2 overlapping the sealable outer layer 7 of the decorative film 15 of the second side border 2; applying a heating temperature T2 to the inside of the tube skirt at the inner face 22 of the overlapping area 3 to produce the side weld of the tube skirt; simultaneously with the application of the heating temperature T2, applying compression between the outer 21 and inner 22 faces of the overlapping area 3 so as to finalize the side weld of the tube skirt.

A device for manufacturing a tube skirt from a flexible strip, comprising a housing, a cylindrical elongated mandrel 30, means used to advance and guide this flexible strip to shape it in the form of a sleeve around the mandrel 30, one of the side borders of this strip overlapping the other side border to form an overlapping area to be welded, an inner heating means 32 located in the mandrel 30 to heat the inner face of the overlapping area, and inner cooling means 33 located in the mandrel 30 to cool the inner face of the overlapping area and downstream from the inner heating means 32.

The device is characterized in that said cooling means 33 is arranged across from the overlapping area and configured to be in direct contact with the overlapping area.

A clad duct comprising an outer sheet of thermoplastic material and an inner duct of rigid foam is disclosed. The outer sheet of thermoplastic material is bonded to the inner duct. The outer sheet has a first edge and a second edge and a seal is provided to seal the first edge and the second edge.

A unit configured to form a tube for producing sealed packages starting from a sheet of packaging material having opening devices pre-applied thereon, comprises at least one guiding assembly configured to interact with the sheet of packaging material to fold it gradually into a tube shape; the guiding assembly comprises a plurality of folding rollers delimiting a passage for the sheet of packaging material and each having a lateral wall configured to cooperate in contact with the sheet of packaging material to control the folding thereof; the folding rollers comprise at least one folding roller having at least one recess on the lateral wall thereof, the recess defining a slot configured to be engaged by the opening devices.

A clad duct comprising an outer sheet of thermoplastic material and an inner duct of rigid foam is disclosed. The outer sheet of thermoplastic material is bonded to the inner duct. The outer sheet has a first edge and a second edge and a seal is provided to seal the first edge and the second edge.