US4983453A
Expired / Lapsed
US
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Hybrid pultruded products and method for their manufacture
Assignee: Plastics Engineering Co
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Filing: 1990-01-02
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Granted: 1991-01-08
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Expires: 2010-01-02
Abstract
Abstract The present invention is a composite pultruded product and the method for its manufacture. The product is made with a plurality of longitudinal glass roving strands. In addition, a cellulosic mat is used in association with the roving. The mat serves as a filler, or reinforcing filler, to ensure uniform resin distribution within the product even when the glass content is significantly reduced. The method can be carried out on convention pultrusion equipment with little or no modification. The cellulose fiber mats may be either air laid or wet laid and should have an ultimate moisture of 3% or less before being incorporated into the pultruded product.
Inventors
- 👤 Frank C. Beall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 01:40
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/04; B29C70/28; B29C70/40; B29C70/50; B29C70/52; B29C70/525; B29C70/06; B29C70/08; B29C70/083; B29K; B29K2105/00; B29K2105/06; B29K2105/08; B29K2105/0854; B29K2105/10; B29K2105/101; B29K2309/00; B29K2309/08; B29K2711/00; B29K2711/12; B29K2711/126; Y; Y10; Y10T; Y10T442/00; Y10T442/60; Y10T442/697; Y10T442/698
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
81 words
A composite pultruded product consisting essentially of a plurality of longitudinally oriented essentially parallel glass roving strands; and a parallel oriented cellulosic mat interlayered between the roving strands, both the roving strands said cellulosic mat having a moisture content of 3% or less, and cellulosic mat being completely saturated with and enclosed within a resin matrix, wherein the glass roving strands comprise from 10-45%, the cellulosic mat from 4-40%, and the resin 40-70 % of the product, all measured by volume.
Claim 2
Dependent Claim
81 words
A composite pultruded product consisting essentially of a plurality of longitudinally oriented essentially parallel glass roving strands; and a parallel oriented cellulosic mat interlayered between the roving strands, both the roving strands said cellulosic mat having a moisture content of 3% or less, and cellulosic mat being completely saturated with and enclosed within a resin matrix, wherein the glass roving strands comprise from 10-45%, the cellulosic mat from 4-40%, and the resin 40-70 % of the product, all measured by volume.
Claim 3
Dependent Claim
19 words
The product of claim 1 in which the cellulosic mat is air laid prior to incorporation into the product.
Claim 4
Dependent Claim
21 words
The product of claim 1 in which the cellulosic mat is wet formed and dried prior to incorporation into the product.
Claim 5
Dependent Claim
22 words
The product of claim 1 in which the cellulosic mat is selected from defibered wood, thermomechanical pulps, chemical pulps, and mixtures thereof.
Claim 6
Dependent Claim
21 words
The product of claim 1 in which the cellulosic mat is combined with up to 20% by weight of noncellulosic fibers.
Claim 7
Dependent Claim
20 words
The product of claim 5 in which the noncellulosic fibers are selected from polyolefin fibers, glass fibers, and mixtures thereof.
Claim 8
Dependent Claim
14 words
The product of claim 1 in which the resin matrix is a thermosetting resin.
Claim 9
Dependent Claim
19 words
The product of claim 7 in which the resin matrix is selected from polyester, epoxy, methylacrylate, and phenolic resins.
Claim 10
Dependent Claim
14 words
The product of claim 1 in which the resin matrix is a thermoplastic resin.
Claim 11
Dependent Claim
29 words
The product of claim 9 in which the resin matrix is selected from the group consisting of polyethylene, polypropylene, acrylonitrile-butadiene-styrene, acetal, polyamide, polyimide, and polyester resins, and mixtures thereof.
Claim 12
Dependent Claim
18 words
The product of claim 1 in which the resin matrix is a mixture of thermosetting and thermoplastic resins.
Claim 13
Dependent Claim
18 words
The product of claim 1 which further contains up to 25% by volume of a glass fiber mat.
Claim 14
Independent Claim
135 words
A method of making a composite pultruded product which comprises: providing a heated pultrusion die; supplying a plurality of essentially parallel continuous glass roving reinforcing strands to the die; further supplying in parallel a cellulosic mat to the die, said mat having a density no greater than about 0.45 g/cc and a basis weight in the range of about 100-600 g/m 2 ; drying said cellulosic mat to a moisture content of 3% or less; impregnating the roving and dried cellulosic mat with a thermosetting resin; supporting said cellulosic mat on and enclosing said cellulosic mat within said roving strands; and drawing the impregnated materials through the heated die to form a pultruded product whereby the cellulosic mat reduces the density of the product while serving to maintain uniform resin distribution throughout the pultruded product.
Claim 15
Independent Claim
135 words
A method of making a composite pultruded product which comprises: providing a heated pultrusion die; supplying a plurality of essentially parallel continuous glass roving reinforcing strands to the die; further supplying in parallel a cellulosic mat to the die, said mat having a density no greater than about 0.45 g/cc and a basis weight in the range of about 100-600 g/m 2 ; drying said cellulosic mat to a moisture content of 3% or less; impregnating the roving and dried cellulosic mat with a thermosetting resin; supporting said cellulosic mat on and enclosing said cellulosic mat within said roving strands; and drawing the impregnated materials through the heated die to form a pultruded product whereby the cellulosic mat reduces the density of the product while serving to maintain uniform resin distribution throughout the pultruded product.
Claim 16
Dependent Claim
20 words
The method of claim 13 wherein the resin is a thermosetting type which is essentially fully cured in the die.
Claim 17
Dependent Claim
31 words
The method of claim 13 wherein the resin is a thermosetting type which is only partially curd, within the pultrusion die and further curing the pultruded product in a second die.
Claim 18
Dependent Claim
12 words
The method of claim 13 wherein the resin is a thermoplastic type.
Claim 19
Dependent Claim
17 words
The method of claim 16 in which the pultruded product is post formed in a second die.
Claim 20
Dependent Claim
21 words
The method of claim 13 which includes preimpregnating the cellulosic mat with resin prior to incorporation with the glass roving strands.
Claim 21
Dependent Claim
19 words
The method of claim 13 which includes impregnating the roving and cellulosic mat with resin in the pultrusion die.
Claim 22
Dependent Claim
24 words
The method of claim 13 which includes impregnating the roving and cellulosic mat with resin in an open bath prior to the pultrusion die.
Claim 23
Dependent Claim
25 words
The method of claim 13 which further includes supporting the cellulosic mat on a glass fiber mat as it is supplied to the pultrusion die.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-01-07 | 1994-07-09 | 1995-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-07 | 1998-07-09 | 1999-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-07 | 2002-07-09 | 2003-01-08 | $7700.00 | Window Closed / Lapsed |