Patent ID: 9073273
Filing Date: 2015-07-07
Classification: B29C,B29L,Y02E,Y10T

Abstract:
1. A method of manufacturing an oblong shell part comprising a fibre-reinforced polymer material by means of an infusion process, whereby fibre material is arranged in a mould cavity and subsequently impregnated with liquid polymer, whereby a plurality of fibre layers is stacked to form a fibre insertion, which in a finished shell part constitute a load carrying main laminate, extending in a longitudinal direction of the shell part to be manufactured, whereby at least one core element is arranged along at least part of the fibre insertion, the at least one core element having a tapered edge section and comprising flow channels for liquid polymer, whereby the plurality of fibre layers to form the fibre insertion is stacked so that the tapered edge section of the at least one core element is wedged in between the fibre layers and thereby into the fibre insertion, whereby liquid polymer is infused into the mould cavity so that it propagates through the stacked fibre layers and into the flow channels of the at least one core element, characterised by that the at least one core element is composed by a first core part and a second core part that are arranged along each other in the longitudinal direction of the shell part to be manufactured so that the first core part is arranged between the second core part and a centre line of the fibre insertion, by that the first core part forms at least part of the tapered edge section of the core element, and by that the surface of the first core part has a higher permeability to liquid polymer than that of the surface of the second core part so that, during infusion, liquid polymer penetrates the surface of the first core part more readily than it penetrates the surface of the second core part, and wherein, during infusion of liquid polymer, polymer flows in the direction from the fibre insertion to the second core part so that it passes the first core part on its way to the second core part.