Honeycomb core having a high compression strength
AssigneeE. I. Du Pont de Nemours and Company
InventorsMIKHAIL R. LEVIT, DARIUSZ WLODZIMIERZ KAWKA
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Abstract
This invention pertains to a method of making a fiber-reinforced composite structure comprising the steps of (i) forming a paper sheet having a Gurley air resistance at least 200 seconds per 100 milliliters, the sheet comprising from 30 to 70 weight percent p-aramid fiber, (ii) depositing on both surfaces of the paper sheet a compression enhancing layer in a quantity up to 5 weight percent based on the weight of the paper, (iii) forming a honeycomb from the sheet of step (ii), and (iv) applying a matrix resin coating to the honeycomb of step (iii).
Claims9
A method of making a fiber-reinforced composite structure comprising the steps of:
- (i) forming a paper sheet having a Gurley air resistance at least 200 seconds per 100 milliliters, the sheet comprising from 30 to 70 weight percent p-aramid fiber,
- (ii) depositing on both surfaces of the paper sheet a compression enhancing layer in a quantity up to 5 weight percent based on the weight of the paper,
- (iii) forming a honeycomb from the sheet of step (ii), and
- (iv) applying a matrix resin coating to the honeycomb of step (iii).
A honeycomb comprising in order
- (i) a paper sheet , the sheet comprising meta-aramid fibrids, para-aramid fibrids or a combination thereof,
- (ii) a compression enhancing layer deposited onto at both outer surfaces of the paper sheet in a quantity up to 5 weight percent based on the weight of the paper, and
- (iii) a matrix resin coating resin coated onto the surface of the compression enhancing layer, wherein the matrix coating resin is phenolic, polyimide, polyetherimide, epoxy or combinations thereof.
Dependencies are inferred from the claim text.