Textile reinforcements for composite materials and method of manufacturing thereof
AssigneeBrochier S.A.
InventorsPierre Allagnat, Jean-Paul Charles, Michel Delehaye
Life of this patent
Estimating the term…
Abstract
From 3 to 25 g/m.sup.2, in particular from 5 to 10 g/m.sup.2 of a pulverulent reactive hot-melt composition including a prepolymer and a hardener for the latter are applied onto one or two faces of textile reinforcement. The hardener becomes active only at a temperature above that at which the powder softens to become tacky. This powder on one or two faces makes it possible in particular to preform the reinforcement before it is employed for the manufacture of an article made of composite material.
Claims14
A textile reinforcement for use in forming a composite material, said textile reinforcement comprising:
- a sheet of reinforcement material having opposite surfaces, and a pulverulent hog-melt composition distributed over at least one of the surfaces of said sheet of reinforcement material as points of powder in an amount of 3 to 25 g/m.sup.2, said composition comprising a prepolymer and a hardener for the prepolymer, said hardener becoming active only at a temperature above that at which said hot-melt composition softens and becomes tacky.
The method for treating a sheet of textile reinforcing material for use in forming a composite material, said method comprising:
- providing a reactive hot-melt pulverulent composition of a prepolymer and a hardener for the prepolymer, the hardener becoming active only at a temperature above that at which the composition softens and becomes tacky;
- and applying said composition as points of powder to at least one of the surfaces of the sheet of textile material at a rate of 3 to 25 g/m.sup.2.
An assembly of textile reinforcements for use in forming a composite material, each of said textile reinforcements in the stack comprising a sheet of reinforcement material having opposite surfaces, and a pulverulent hot-melt composition distributed over at least one of the surfaces of said sheet of reinforcement material as points of powder in an amount of 3 to 25 g/m.sup.2, said composition comprising a prepolymer and a hardener for the prepolymer, said hardener becoming active only at a temperature above that at which said hot-melt composition softens and becomes tacky.
An assembly of textile reinforcements for use in forming a composite material, at least one of said textile reinforcements comprising a sheet of reinforcement material having opposite surfaces, and a pulverulent hot-melt composition distributed over at least one of the surfaces of said sheet of reinforcement material as points of powder in an amount of 3 to 25 g/m.sup.2, said composition comprising a prepolymer and a hardener for the prepolymer, said hardener becoming active only at a temperature above that at which said hot-melt composition softens and becomes tacky.
Dependencies are inferred from the claim text.