Core having a high shear strength and articles made from same
AssigneeE. I. Du Pont de Nemours and Company
InventorsMikhail R. Levit, Subhotosh Khan
Life of this patent
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Abstract
This invention relates to a honeycomb core having improved shear properties made from a p-aramid paper substrate. The paper comprises 50-85 parts by weight of p-aramid floc, 10-40 parts by weight of p-aramid pulp and 5-30 parts by weight of aramid fibrids. Prior to impregnation with resin, the paper has a Gurley air resistance of from 3 to 40 seconds per 100 milliliters.
Claims7
A honeycomb structure comprising a plurality of interconnected walls having surfaces that define a plurality of honeycomb cells, wherein said cell walls are formed from a paper comprising:
- a) 10 to 40 parts by weight of para-aramid pulp,
- b) 50 to 85 parts by weight of para-aramid floc, and
- c) 5 to 30 parts by weight of aramid fibrids
A structural sandwich panel comprising a resin impregnated honeycomb core having at least one facesheet attached to both exterior surfaces of said core wherein the cell walls of the core are formed from a paper comprising:
- a) 10 to 40 parts by weight of para-aramid pulp,
- b) 50 to 85 parts by weight of para-aramid floc, and
- c) 5 to 30 parts by weight of aramid fibrids
- A sandwich panel according to claim 6 wherein the cell wall of the honeycomb core has a paper to resin weight ratio in the range from about 7:3 to about 2:8.
Dependencies are inferred from the claim text.