Material composition for the production of a stiffening member for lightweight construction, method for producing a stiffening member for lightweight construction and stiffening member for lightweight construction

A stiffening member for lightweight construction, comprising:

• a. a cellulose-based core made of a wavy paper web or having a honeycomb structure,
• b. a kraftliner, which is mechanically connected to the wavy paper web or the honeycomb structure and includes a planar paper web,
• wherein
• c. the planar paper web is mechanically connected to the core by means of a thermally cured, thermosetting adhesive layer.

A method for producing a stiffening member for lightweight construction, including the following method steps:

• a. providing a material composite having:
• i. a cellulose-based core made of a wavy paper web or having a honeycomb structure,
• ii. a kraftliner, which is mechanically connected to the wavy paper web or the honeycomb structure and which comprises a planar paper web,
• iii. a thermally curable adhesive layer, which is thermosetting in the cured state and which is disposed between the core and the paper web of the kraftliner,
• b. inserting the material composite into the cavity of a heated molding tool,
• c. thermoforming the material composite while thermally curing the adhesive layer, in such a way that the latter mechanically connects the core and the kraftliner with each other.