A process for manufacturing a composite structure includes: providing first mandrels, each first mandrel including a base and a plurality of projections arranged longitudinally along and projecting vertically out from the base; providing second mandrels; providing first ribbon plies, each first ribbon ply including a sheet of fibrous material; arranging each first ribbon ply with a respective first mandrel, the arranging of each first ribbon ply including substantially covering each surface of each of the projections of one of the first mandrels with a respective first ribbon ply; mating each second mandrel with a respective first mandrel such that each first ribbon ply is sandwiched between a respective first mandrel and a respective second mandrel; and curing resin disposed with the first ribbon plies to consolidate the first ribbon plies together and form a fiber-reinforced composite core structure of an acoustic panel.

A process for manufacturing a composite structure includes: providing first mandrels, each first mandrel including a base and a plurality of projections arranged longitudinally along and projecting vertically out from the base; providing second mandrels; providing first ribbon plies, each first ribbon ply including a sheet of fibrous material; arranging each first ribbon ply with a respective first mandrel, the arranging of each first ribbon ply including substantially covering each surface of each of the projections of one of the first mandrels with a respective first ribbon ply; mating each second mandrel with a respective first mandrel such that each first ribbon ply is sandwiched between a respective first mandrel and a respective second mandrel; and curing resin disposed with the first ribbon plies to consolidate the first ribbon plies together and form a fiber-reinforced composite core structure of an acoustic panel.

A corrugating roll unit conveyance apparatus includes a mounting base having a first accommodation part for accommodating a corrugating roll unit to be removed and a second accommodation part for accommodating a corrugating roll unit to be installed; and a movement device for moving the mounting base to a first replacement position at which the first accommodation part faces the existing corrugating roll unit, a second replacement position at which the second accommodation part faces a space from which the existing corrugating roll unit has been removed, and a retracted position separated from the first replacement position and the second replacement position.

A corrugating roll unit conveyance apparatus includes a mounting base having a first accommodation part for accommodating a corrugating roll unit to be removed and a second accommodation part for accommodating a corrugating roll unit to be installed; and a movement device for moving the mounting base to a first replacement position at which the first accommodation part faces the existing corrugating roll unit, a second replacement position at which the second accommodation part faces a space from which the existing corrugating roll unit has been removed, and a retracted position separated from the first replacement position and the second replacement position.

An object of the present invention is to provide a fiber-reinforced composite material achieving both lightweight properties and mechanical properties, a laminate thereof, and a prepreg capable of easily molding a sandwich structure thereof. The present invention is a prepreg comprising a reinforced fiber substrate (B) impregnated with a resin (A), wherein the reinforced fiber substrate (B) exists in a folded state having a plurality of folds with a fold angle of 0 or more and less than 90 in the prepreg.

An object of the present invention is to provide a fiber-reinforced composite material achieving both lightweight properties and mechanical properties, a laminate thereof, and a prepreg capable of easily molding a sandwich structure thereof. The present invention is a prepreg comprising a reinforced fiber substrate (B) impregnated with a resin (A), wherein the reinforced fiber substrate (B) exists in a folded state having a plurality of folds with a fold angle of 0 or more and less than 90 in the prepreg.

A panel having a base portion having at least one sidewall extending therefrom, the sidewall extending away from the base portion at a first predetermined angle, the first predetermined angle formed by a die having a second predetermined angle, the second predetermined angle being 1 to 12 degrees smaller as compared to the first predetermined angle so as to overbend the panel during the forming process, the panel relaxing to the first predetermined angle after the panel as entirely cooled after the forming process.

A panel having a base portion having at least one sidewall extending therefrom, the sidewall extending away from the base portion at a first predetermined angle, the first predetermined angle formed by a die having a second predetermined angle, the second predetermined angle being 1 to 12 degrees smaller as compared to the first predetermined angle so as to overbend the panel during the forming process, the panel relaxing to the first predetermined angle after the panel as entirely cooled after the forming process.

Thermoplastic bags with phased deformation patterns are described. In particular, one or more implementations comprise thermoplastic bags with ring rolling, SELFing, or other deformation patterns phased or aligned relative to the sides of the bags. The phased deformation patterns can allow for reducing or eliminating deformation patterns in areas of the thermoplastic bag in which side seals or other seals are formed. Additionally or alternatively, the phased deformation patterns can provide for zones that provide differing properties (e.g., functional or aesthetic). Such zones can vary aligned along a width of the thermoplastic bag and optionally also vary along a height of the thermoplastic bag. The differing zones can provide the thermoplastic bags with phased deformations that provide leak prevention, liquid containment, and other benefits.

Wheel arch liner for a vehicle comprising at least a structural porous fibrous layer extending longitudinal in a curved shape with a front end and a rear end wherein the porous fibrous layer is at least partly corrugated wherein the corrugations comprises alternating grooves and ridges and wherein at least the ridges are situated at the inner side of the curve shaped porous fibrous layer and wherein the grooves and ridges extend longitudinal transversal to the longitudinal curved shape.