Method for the production of a composite product by moulding
AssigneeVetrotex France
InventorsMichel Gonthier, Anne Avena, Jean-Marc Bain
Life of this patent
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Abstract
A method of moulding, notably injection or compression moulding, of a composite product from an impregnation paste based upon thermosetting resin or resins and a reinforcement of glass threads, by supplying the moulds with an impregnation paste and reinforcement in the form of coated chopped direct rovings incorporated into the paste, the coating material of which includes an adhesive agent based upon polyurethane or polyurethanes.
Claims15
In the method of moulding a composite product in a mould from a prepreg comprised of an impregnation paste based upon at least one thermosetting resin and a reinforcement of glass threads incorporated into said paste, wherein the improvement comprises the steps of:
- a) forming a plurality of individual and separate glass filaments, each of which has a diameter of from about 14-20 micrometers;
- b) coating said filaments with an adhesive agent based upon at least one polyurethane, said coating being applied in a proportion to the glass filament of between about 0.4 and 1.21% by weight;
- c) feeding said filaments longitudinally of their length into contact with each other to form a strand of direct roving;
- d) chopping the direct roving transversely of its length to form a plurality of chopped direct rovings having lengths between about 10 and 25 mm;
- e) supplying said mould with a prepreg which is comprised of said impregnation paste and said chopped direct rovings;
- and
- f) forming said composite product from the prepreg of the previous step.
Dependencies are inferred from the claim text.