Production method for reinforcing core materials for core...

B - Operations – Transporting – 29 – C

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B29C 70/24 (2006.01) B29C 70/08 (2006.01)

Patent

CA 2616655

The invention relates to a sandwich structure reinforcement by means of a reinforcement device. The sandwich structure covering layers can be mainly made of a composite (FKV) and a polymer rigid foam core material. The reinforcement is carried out by a gripper, which pierces the sandwich structure or the core material, only (see figure: first stage) at one side, thereby obtaining a hole penetrating through the polymer rigid foam (see figure: second stage). At the opposite side, said gripper catches the reinforcing structure ( for example a sewing thread, pultruded fibre-plastic composite rods) (see figure: second stage) and inserts the reinforcing structure into the sandwich structure during the back movement thereof (see figure: third stage). The through hole is additionally enlargeable by the reinforcing structure, thereby making it possible to obtain an important fibre volume part in the though hole of the core material. Contrary to conventional sewing processes, it makes it possible to influence the hole passing through the core material mainly with the reinforcing structure. After the reinforcing process, the sandwich structure is impregnated with a duromer or thermoplastic matrix material by a liquid composite moulding method. The impregnated sewing threads are embodied in the core material in the form of highly rigid and solid unidirectional FKV-elements which reinforce the core material and the entire sandwich structure.

L'invention concerne le renforcement de structures sandwichs à âmes à l'aide d'un dispositif d'armature. Les couches de recouvrement de la structure sandwich à âme peuvent être principalement constituées d'un composite fibres-matière plastique (FKV) et le matériau âme de mousse dure polymérique. L'armature s'effectue par une pince qui, d'un côté, perce la structure sandwich à âme ou seulement le matériau âme (voir figure : étape 1 ), ce qui permet d'obtenir un trou traversant dans la mousse dure polymérique (voir figure: étape 2). Au côté opposé, la pince saisit la structure de renforcement (p. ex. fil à coudre, bâtonnets composites fibres-matière plastique extrudés par étirage) (voir figure 1, étape 2) et insère la structure de renforcement dans la structure sandwich à âme lors de son déplacement de retour (voir figure 1, étape 3). Un élargissement supplémentaire du trou traversant peut être réalisé par la structure de renforcement, ce qui permet d'obtenir une fraction très importante du volume fibres dans le trou traversant du matériau âme. Contrairement aux technologies de couture classiques, cela permet d'agir sur le diamètre du trou traversant le matériau âme principalement par la structure de renforcement. Après le processus d'armature, la structure sandwich à âme est imprégnée d'une matière première matrice duromère ou thermoplastique dans un procédé de moulage d'un matériau composite liquide. Les fils à coudre imprégnés présentent dans le matériau âme des éléments FKV à haute rigidité, solides et unidirectionnels qui renforcent le matériau âme et toute la structure sandwich à âme.

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