Airex Ag

Alcan Technology & Management Ltd.

Lonza Ag

3a Technology & Management Ag

Dietmar Rakutt

Martin Gaul

Lukas Berger

Ulrich Daum

Roman Gätzi

Franz Burkard

The invention relates to a contoured structural element () for use as a core layer in a curved sandwich composite element, the contoured structural element () being formed from a thermoplastic foam, in particular PET, the contoured structural element () being subdivided, except for a connecting layer (), into a plurality of body elements (), and the body elements () and the connecting layer () being aligned parallel to a base area () of the contoured structural element () which is in a planar state. According to the invention, at least one surface layer () of the connecting layer () and the adjoining surface layer () of the body elements () at least partly have a thermally densified layer (); the body elements (), the connecting layer () and the thermally densified layer () being made of the same material.

Contoured structural element and production of the contoured structural element

A method for producing a hard-foam film, for use as a core layer in sandwich composite elements, having an increased compressive strength along a thickness extension extending perpendicularly to its surface extension, from a foam block () of a thermoplastic, extruded, in particular partially crystalline and/or closed-cell, plastic rigid foam material, PET.

Method and device for producing a hard-foam film

A structural element for use as a core layer in a sandwich composite element, wherein the structural element () is formed from a plurality of mutually welded body segments () made from an extrusion foamed thermoplastic, and wherein the structural element () has a first face side () for bonding to a cover layer, wherein a surface of the first face side () that can be loaded with a resin () has open pores (), wherein the surface of the first face side () is created by hot-element cutting, in such a manner that the surface is thermally sealed to some extent, wherein a gloss value of the surface of the first face side (), measured at 60&#xb0; in accordance with DIN 67530-1982 is between 2 and 10 gloss units.

Structural element and method for the production thereof

An unmixed plastic sheet, which is made of a thermoplastic material and which is composed of a number of body segments that are adjacent to one another in a plane, interconnected and made of a closed-cell foam material. The body segments are thermoplastically welded to one another at their abutting lateral faces while forming flat weld seams. The flat weld seams form a plastic intermediate layer, which has few pores, and which is provided in the form of a web structure that, when viewed from above, is reticular and reinforces the plastic sheet. The inventive plastic sheet is preferably used as a core layer in sandwich composites.

Foamed plastic sheet

Vane or rotor blade

Microcellular rigid foams with a matrix consisting of cross-linked duromers, especially of polytriazine resins, and with an apparent density of 20 to 95 percent of the density of the compact matrix material. The rigid foams are highly stable and highly temperature resistant and are suitable for use, e.g., as material for aircraft lining.

Growing community of inventors

Cham, Switzerland

Dietmar Rakutt