An automatic machine for providing corrugated sheet-like elements having a component for the continuous corrugation of a ribbon in motion in a longitudinal direction. The corrugation component includes an upper conveyor and a lower conveyor. The upper conveyor includes a plurality of upper abutment elements that are extended substantially transversely to the longitudinal direction of motion of the ribbon. The lower conveyor includes a plurality of lower abutment elements that are extended substantially transversely to the longitudinal direction of motion of the ribbon. The upper abutment elements are intercalated between the lower abutment elements in a work area. The upper abutment elements each comprise include a flap, which has, in the end adapted to make contact with the ribbon, at least one portion that has a grip component.

A thermoplastic bag may include a sidewall that may have a plurality of first and second ribs formed therein. The first ribs may be longer in length but shorter in height than the second ribs. The second ribs may be arranged in discrete networks that appear superimposed over the first ribs. The second ribs may normally remain in a bent-over configuration. When a force is applied, the second ribs may expand the area of the sidewall so that the bag may easily accommodate large objects. To produce the bag, a thermoplastic web may be directed between opposing first and second rollers. One of the rollers may include ridges that may have first and second segments of differing heights that correspond to the differing heights of the first and second ribs. The formation of the first ribs may increase the width of the web.

A method produces a hollow electrical insulator. The method includes: winding first wound layers of a first fiber element onto a core; and winding second wound layers of a second fiber element onto an end region of the core. The first wound layers have turns of the first fiber element which enclose a first winding angle with a main direction of extension of the core. The second wound layers have turns of the second fiber element which enclose a second winding angle with the main direction of extension of the core which is larger than the first winding angle. An inner region of the core remains free of second wound layers.

A manufacturing device of a membrane-electrode assembly for fuel cell includes a membrane unwinder unwinding and supplying a polymer electrolyte membrane of a roll shape; a film unwinder unwinding and supplying a release film of a roll shape respectively coated with an anode catalyst electrode layer and a cathode catalyst electrode layer with a predetermined interval in an upper and lower sides of the polymer electrolyte membrane; upper and lower bonding rolls respectively disposed at the upper and lower sides of a progressing path of the polymer electrolyte membrane and the release film and pressed to an upper surface and a lower surface of the polymer electrolyte membrane; and a protection film unwinder unwinding and supplying a protection film between adhered surfaces of the release film and the upper and lower bonding rolls.

A manufacturing device of a membrane-electrode assembly for fuel cell includes a membrane unwinder unwinding and supplying a polymer electrolyte membrane of a roll shape; a film unwinder unwinding and supplying a release film of a roll shape respectively coated with an anode catalyst electrode layer and a cathode catalyst electrode layer with a predetermined interval in an upper and lower sides of the polymer electrolyte membrane; upper and lower bonding rolls respectively disposed at the upper and lower sides of a progressing path of the polymer electrolyte membrane and the release film and pressed to an upper surface and a lower surface of the polymer electrolyte membrane; and a protection film unwinder unwinding and supplying a protection film between adhered surfaces of the release film and the upper and lower bonding rolls.

A system and method of constructing a 4D-printed ceramic object includes extruding inks including particles and polymeric ceramic precursors through a nozzle to deposit the inks on a heating plate, whereby a 3D-printed elastomeric object is formed on the heating plate, folding the 3D-printed elastomeric object into a complex structure to form a 4D-printed pre-strained elastomeric object, and converting the 4D-printed elastomeric object into the 4D-printed ceramic object.

A fibrous preform for manufacturing an annular housing made of composite material for a turbine engine includes at least one layer that has a fibrous texture, has a three-dimensional or multilayer weave, and extends about a longitudinal axis. At least one mat includes a thermoplastic material filled with carbon nanotubes and extending about the axis. At least one multiaxial fibrous sheet extends about the axis. The at least one mat is inserted between the fibrous sheet and the at least one layer having a fibrous texture.

In one aspect, a method for manufacturing a composite material for structural applications may include steps of sawing and arranging bamboo woods into bamboo bundles; heating the bamboo bundles; dipping the bamboo bundles in phenolic resin; drying the bamboo bundles; arranging the bamboo bundles with the green surface facing outside and the yellow surface facing inside; and forming bamboo beams with a hot-pressing process.

In one aspect, a method for manufacturing a composite material for structural applications may include steps of sawing and arranging bamboo woods into bamboo bundles; heating the bamboo bundles; dipping the bamboo bundles in phenolic resin; drying the bamboo bundles; arranging the bamboo bundles with the green surface facing outside and the yellow surface facing inside; and forming bamboo beams with a hot-pressing process.

It is possible to achieve reduction in the occurrence of tension decrease at fiber bundles in a sheet. A method of manufacturing a tank includes: a feed step of feeding a sheet including aligned fiber bundles while applying tension to the sheet in the longitudinal directions of the fiber bundles; a detection step of detecting a decreased tension part subjected to tension decrease in the sheet being fed; a tension recovery step of compensating for the tension decrease at the decreased tension part by spraying an organic solvent if the decreased tension part is detected in the detection step; and a winding step of winding the sheet having been fed on a liner.