Production of composite structure involves forming local reinforcement zone in core structure provided with fold valleys, prior to the application of cover layer on the core structure to produce composite sandwich structure

摘要

Composite structure (34) is produced by providing a core structure having a folded configuration with fold valleys forming open channels; and before applying any cover layer (35) on the core structure to produce a composite sandwich structure, forming a local reinforcement zone (36) in the core structure. Independent claims are also included for: (1) core structure for producing a composite sandwich structure comprising the core having a folded configuration with fold valleys forming open channels, and a local reinforcement zone in or on the core in which the core structure does not have the cover layers on two opposite sides of the core structure; and (2) composite sandwich structure comprising the core structure. The first and second cover layers are applied on the opposite first and second sides of the core structure. Marking(s) on the cover layer(s) indicates a location of the local reinforcement zone.