US5137768A
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High shear modulus aramid honeycomb
Assignee: EIDP Inc
•
Filing: 1990-07-16
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Granted: 1992-08-11
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Expires: 2010-07-16
Abstract
Abstract A light weight honeycomb structure is disclosed made from aramid fibers and exhibiting extremely high shear modulus.
Inventors
- 👤 Pui-Yan Lin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:07
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/52; D21H13/00; D21H13/10; D21H13/20; D21H13/26; D21H17/47; D21H17/48; Y; Y10; Y10S; Y10S428/00; Y10S428/902; Y10S493/00; Y10S493/966; Y10T; Y10T428/00; Y10T428/24; Y10T428/24149; Y10T428/24165
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
113 words
A honeycomb structure comprising a core impregnated by a solid matrix resin wherein the core comprises: a) a nonwoven paper including a uniform mixture of 0 to 50, weight, percent polymeric binder material and 50 to 100, weight, percent para-aramid fibers and b) a solid matrix resin uniformly distributed throughout the paper such that the para-aramid fibers represent 20 to 80 percent of the total volume of the impregnated core material and wherein the core exhibits a density of 0.015 to 0.24 g/cc and a shear modulus of greater than 1000 kg/cm 2 , and wherein the paper, in the absence of matrix resin, has a density corresponding to the following relationship: ##EQU3##
Claim 2
Dependent Claim
113 words
A honeycomb structure comprising a core impregnated by a solid matrix resin wherein the core comprises: a) a nonwoven paper including a uniform mixture of 0 to 50, weight, percent polymeric binder material and 50 to 100, weight, percent para-aramid fibers and b) a solid matrix resin uniformly distributed throughout the paper such that the para-aramid fibers represent 20 to 80 percent of the total volume of the impregnated core material and wherein the core exhibits a density of 0.015 to 0.24 g/cc and a shear modulus of greater than 1000 kg/cm 2 , and wherein the paper, in the absence of matrix resin, has a density corresponding to the following relationship: ##EQU3##
Claim 3
Dependent Claim
24 words
The honeycomb core of claim 1 wherein the matrix resin is selected from the group consisting of an epoxy resin and a phenolic resin.
Claim 4
Dependent Claim
20 words
The honeycomb core of claim 2 wherein the shear modulus of the core is greater than 1000 kg/cm 2 .
Claim 5
Dependent Claim
109 words
The honeycomb structure comprising a core impregnated by a solid matrix resin wherein the core comprises: a) a nonwoven paper including a uniform mixture of 0 to 50, weight, percent polymeric binder material and 50 to 100, weight, percent para-aramid fibers and b) a solid matrix resin uniformly distributed throughout the paper such that the para-aramid fibers represent 20 to 80 percent of the total volume of the impregnated core material and wherein the core exhibits a shear modulus in accordance with the following relationship: Shear Modulus (kg/cm.sup.2)>7000×core density (g/cm.sup.3), and wherein the paper, in the absence of matrix resin, has a density corresponding to the following relationship: ##EQU4##
Claim 6
Dependent Claim
109 words
The honeycomb structure comprising a core impregnated by a solid matrix resin wherein the core comprises: a) a nonwoven paper including a uniform mixture of 0 to 50, weight, percent polymeric binder material and 50 to 100, weight, percent para-aramid fibers and b) a solid matrix resin uniformly distributed throughout the paper such that the para-aramid fibers represent 20 to 80 percent of the total volume of the impregnated core material and wherein the core exhibits a shear modulus in accordance with the following relationship: Shear Modulus (kg/cm.sup.2)>7000×core density (g/cm.sup.3), and wherein the paper, in the absence of matrix resin, has a density corresponding to the following relationship: ##EQU4##
Claim 7
Dependent Claim
24 words
The honeycomb core of claim 4 wherein the matrix resin is selected from the group consisting of an epoxy resin and a phenolic resin.
Claim 8
Dependent Claim
20 words
The honeycomb core of claim 5 wherein the shear modulus of the core is greater than 1000 kg/cm 2 .
Claim 9
Dependent Claim
112 words
A honeycomb structure comprising a core with hexagonal cells impregnated by a solid matrix resin wherein the core comprises: a) a nonwoven paper including a uniform mixture of 0 to 50, weight, percent polymeric binder material and 50 to 100, weight, percent para-aramid fibers and b) a solid matrix resin uniformly distributed throughout the paper such that the para-aramid fibers represent 20 to 80 percent of the total volume of the impregnated core material and wherein the core exhibits a shear modulus in accordance with the following relationship: Shear Modulus (kg/cm.sup.2)>7000×core density (g/cm.sup.3), and wherein the paper, in the absence of matrix resin, has a density corresponding to the following relationship: ##EQU5##
Claim 10
Dependent Claim
112 words
A honeycomb structure comprising a core with hexagonal cells impregnated by a solid matrix resin wherein the core comprises: a) a nonwoven paper including a uniform mixture of 0 to 50, weight, percent polymeric binder material and 50 to 100, weight, percent para-aramid fibers and b) a solid matrix resin uniformly distributed throughout the paper such that the para-aramid fibers represent 20 to 80 percent of the total volume of the impregnated core material and wherein the core exhibits a shear modulus in accordance with the following relationship: Shear Modulus (kg/cm.sup.2)>7000×core density (g/cm.sup.3), and wherein the paper, in the absence of matrix resin, has a density corresponding to the following relationship: ##EQU5##
Claim 11
Dependent Claim
24 words
The honeycomb core of claim 7 wherein the matrix resin is selected from the group consisting of an epoxy resin and a phenolic resin.
Claim 12
Dependent Claim
20 words
The honeycomb core of claim 8 wherein the shear modulus of the core is greater than 1000 kg/cm 2 .
Claim 13
Dependent Claim
113 words
A honeycomb structure comprising a core impregnated by a solid matrix resin wherein the core comprises: a) a nonwoven paper including a uniform mixture of 0 to 50, weight, percent polymeric binder material and 50 to 100, weight, percent para-aramid fibers and b) a solid matrix resin uniformly distributed throughout the paper such that the para-aramid fibers represent 20 to 80 percent of the total volume of the impregnated core material and wherein the core exhibits a density of 0.015 to 0.24 g/cc and a shear modulus of greater than 1000 kg/cm 2 , and wherein the paper, in the absence of matrix resin, has a density corresponding to the following relationship: ##EQU6##
Claim 14
Dependent Claim
113 words
A honeycomb structure comprising a core impregnated by a solid matrix resin wherein the core comprises: a) a nonwoven paper including a uniform mixture of 0 to 50, weight, percent polymeric binder material and 50 to 100, weight, percent para-aramid fibers and b) a solid matrix resin uniformly distributed throughout the paper such that the para-aramid fibers represent 20 to 80 percent of the total volume of the impregnated core material and wherein the core exhibits a density of 0.015 to 0.24 g/cc and a shear modulus of greater than 1000 kg/cm 2 , and wherein the paper, in the absence of matrix resin, has a density corresponding to the following relationship: ##EQU6##
Claim 15
Dependent Claim
112 words
A honeycomb structure comprising a core impregnated by a solid matrix resin wherein the core comprises: a) a nonwoven paper including a uniform mixture of 0 to 50, weight, percent MPD-I fibrids and 50 to 100, weight, percent PPD-T fibers and b) a solid matrix resin uniformly distributed throughout the paper such that the para-aramid fibers represent 20 to 80 percent of the total volume of the impregnated core material and wherein the core exhibits a density of 0.015 to 0.24 g/cc and a shear modulus of greater than 1000 kg/cm 2 , and wherein the paper, in the absence of matrix resin, has a density corresponding to the following relationship: ##EQU7##
Claim 16
Dependent Claim
112 words
A honeycomb structure comprising a core impregnated by a solid matrix resin wherein the core comprises: a) a nonwoven paper including a uniform mixture of 0 to 50, weight, percent MPD-I fibrids and 50 to 100, weight, percent PPD-T fibers and b) a solid matrix resin uniformly distributed throughout the paper such that the para-aramid fibers represent 20 to 80 percent of the total volume of the impregnated core material and wherein the core exhibits a density of 0.015 to 0.24 g/cc and a shear modulus of greater than 1000 kg/cm 2 , and wherein the paper, in the absence of matrix resin, has a density corresponding to the following relationship: ##EQU7##
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1995-08-11 | 1996-02-10 | 1996-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-11 | 2000-02-10 | 2000-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-11 | 2004-02-10 | 2004-08-11 | $7700.00 | Window Closed / Lapsed |