Back to results
US 2003/0192663 A1Published application
High temperature paper
AssigneeFiberMark, Inc.
InventorTyrone Cornbower
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeFiberMark, Inc.
InventorTyrone Cornbower
Estimating the term…
Provided is a paper structure comprised of two outside layers and at least one inside layer. The two outside layers are comprised of substantially cellulosic pulp fiber, and the inside layer is comprised of a high temperature fiber and a polymeric binder, and preferably cellulosic pulp fiber. In a preferred embodiment, the structure comprises at least three inside layers, all comprised of cellulosic pulp fiber, high temperature fiber and a polymeric binder. The resulting paper structure finds particular use as a high temperature transformer paper in the manufacture of transformers.
A paper structure comprised of two outside layers and at least one inside layer, with the two outside layers being comprised of substantially cellulosic pulp fiber, and the inside layer being comprised of cellulosic pulp fiber, a high temperature fiber and a polymeric binder.
A paper structure comprised of two outside layers and at least one inside layer, with the two outside layers being comprised substantially of cellulosic pulp fiber, and the inside layer being comprised of a high temperature fiber and a polymeric binder.
Dependencies are inferred from the claim text.
Drawings are temporarily unavailable. Open the PDF at USPTO
From the US filing history. Foreign family members aren’t listed.
Backward citations are indexed for grants only.
Multi-ply: at least one of the sheets having a fibrous composition differing from that of other sheets
From macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds: polyamides; Polyimides
Obtained by reactions only involving carbon-to-carbon unsaturated bonds: polyalkenyalcohols; Polyalkenylethers; Polyalkenylesters
Next to cellulosic: paper or wood
Term end not estimated
1. Field of the Invention
Provided is a high temperature paper structure comprised of two outside layers and at least one inside layer. The two outside layers are generally comprised of substantially cellulosic pulp fiber, and the inside layer is comprised of cellulosic pulp fiber, a high temperature fiber and a polymeric binder. The paper structure can be used as a high temperature E-board for application in transformers, and offers enhanced thermal resistance.
2. Description of Related Art
A three ply paper structure in accordance with the present invention was prepared. The cylinder machine was used where separate stocks were employed for the outside layers and the inside layer.
The outside layers were fed a furnish comprised of cellulosic pulp. The furnish for the inside layer comprised 70% by weight of a cellulosic pulp, 20% by weight of a polymeric binder, i.e., polyvinyl alcohol, and 10% by weight of a polyaramide fiber. The polymeric binder was comprised of Celvol 165 SF polyvinyl alcohol, and the high temperature fiber was NOMEX® fiber, one-quarter inch in length and 2.0 denier.
Once the furnish for the outside layers and the inside layer had been provided to each of the respective cylinders, a three ply paper structure was prepared. The outer layers were comprised of solely cellulosic pulp, and the inside layer was comprised of the cellulosic pulp in combination with the high temperature fiber and the polymeric binder. The resulting paper structure was then pressed, dried and calendared in conventional fashion. The drying was conducted at a temperature sufficient to activate the polyvinyl alcohol polymeric binder.