Sandwich component and method for the production thereof

摘要

The present invention relates to a sandwich component, which comprises a honeycomb core (1) having a plurality of webs (1′) and at least one cover layer (2, 3), wherein the honeycomb core (1) is made of a cellulose-based material, in particular paper. The cover layer (2, 3) is formed from a fiber-reinforced semifinished product having a thermoplastic material matrix, wherein the webs (1′) of the honeycomb core (1) are partially received into the thermoplastic material matrix of the cover layer (2, 3) at connection points (A) to the cover layer (2, 3) so that the sandwich component is bonded. The invention further relates to production methods for the sandwich component.

主权项

1. A method for the production of a sandwich component comprising a honeycomb core (1) with a plurality of webs (1′) and at least two cover layers (2, 3) the honeycomb core (1) consisting of paper, cardboard or other cellulose-based material wherein the cover layers (2, 3) are formed from a fiber-reinforced semi-finished material with a thermoplastic matrix, wherein the webs (1′) of the honeycomb core (1) are at least partially accommodated in the thermoplastic matrix of the cover layer (2, 3) at connecting points (A) to the cover layer (2, 3), thus providing a composite of the sandwich component, and wherein the sandwich component has an edge seal created by joining the cover layers (2, 3) by local melting of the thermoplastic matrix of the cover layers (2, 3), the sandwich component having a flat shape or a shape curved about a radius (R), the method comprising the steps of:
providing the honeycomb core (1) and at least two fiber-reinforced semi-finished materials with a thermoplastic matrix, placing the semi-finished materials above and/or below the honeycomb core, positioning the assembly in a pressing tool with an upper die (4′) and a lower die (4) which provide the preset flat or curved shape of the sandwich component, applying pressure and bonding the assembly consisting of the semi-finished materials and the honeycomb core (1), the thermoplastic matrix being subjected to a temperature between a glass transition temperature and a melting point of the plastic material,
wherein the bond is provided by at least partially melting the thermoplastic matrix and a partial accommodation of the webs (1′) of the honeycomb core (1) in the thermoplastic matrix at connecting points (A) of the webs (1′) to the cover layers (2, 3) represented by the fiber-reinforced semi-finished material with the thermoplastic matrix, wherein the semi-finished materials provided for forming the cover layers have dimensions which overlap a surface of the honeycomb core and its edge surfaces, and in that under the application of pressure the projecting edges of the semi-finished materials are bent around the edge of the honeycomb core, and in that the bonding of the cover layers and a sealing of the honeycomb core are provided by a local melting of the thermoplastic matrix to bond the cover layers (2, 3) to each other and to the edge of the honeycomb core.