Claims
- 1. A process for preimpregnating reinforcing elements including fibers, fabrics or braids with a liquid substance, said reinforcing elements being usable to make a composite material, characterized by having the following series of stages:
- said reinforcing elements are placed in an enclosure,
- a vacuum of sufficient intensity and duration is produced in said enclosure to eliminate at least the majority of water and gas present in the reinforcing elements, and
- a sufficient quantity of said substance is introduced into said enclosure so that said substance will cover said elements once the elements have been impregnated; said liquid substance being a solvent-free thermosetting resin in state A.
- 2. A process according to claim 1 characterized by degassing said substance under vacuum before introducing the substance into said enclosure.
- 3. A process according to claim 1 characterized by using said substance when hot.
- 4. A process according to claim 1 characterized by maintaining said enclosure in a vacuum after introducing the sufficient quantity of said substance.
- 5. A process according to claim 4 characterized by, after producing the vacuum in the enclosure and introducing said substance into said enclosure in a sufficient quantity for said substance to cover said elements once they have been impregnated, said enclosure is pressurized.
- 6. A process according to claim 5 characterized by when the enclosure has been pressurized, introduction of material into the substance impregnating said reinforcing elements is prevented.
- 7. A process according to claim 1 characterized by said reinforcing elements being fibers wound onto a mandrel and by the turns of consecutive layers crossing at an angle of at least 30.degree..
- 8. A process according to claim 7 wherein said reinforcing elements are fibers wound onto a mandrel, characterized by the mandrel being perforated.
Priority Claims (1)
Number |
Date |
Country |
Kind |
88 05492 |
Apr 1988 |
FRX |
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Parent Case Info
This application is a continuation of application Ser. No. 460,323, filed as PCT/FR89/00186, Apr. 20, 1989, now abandoned.
US Referenced Citations (7)
Continuations (1)
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Number |
Date |
Country |
Parent |
460323 |
Feb 1990 |
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