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US 2017/0321378 A1Published application
Pressboard
AssigneeABB Schweiz AG
InventorsClaire Pitois, Elson Montibon, Fredrik Sahlen, Lars Schimdt, Orlando Girlanda, Torbjorn Brattberg, Lars Wagberg
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Abstract
A cellulose based pressboard for insulation in an electrical power transformer, the pressboard includes polyvinylamine (PVAm), and polyacrylamide (PAM), in a combined amount of between 0.01% and 20% by weight of the pressboard.
Claims19
A cellulose based pressboard for insulation in an electrical apparatus, the pressboard comprising:
- Polyvinylamine (PVAm);
- and
- Polyacrylamide (PAM);
- in a combined amount of between 0.01% and 20% by weight of the pressboard, wherein the pressboard is in the form of a solid insulator for the electrical apparatus.
1 more element
An electrical apparatus comprising a solid insulation material made from a pressboard comprising:
- polyvinylamine (PVAm);
- and
- polyacrylamide (PAM);
- in a combined amount of between 0.01% and 20% by weight of the pressboard.
1 more element
A method for producing a cellulose based pressboard, the method comprising:
- providing a cellulose pulp;
- mixing an amount of cationic PVAm into the pulp;
- mixing an amount of anionic PAM into the pulp;
- and
- applying pressure to the PVAm and PAM containing pulp to form a pressboard;
- and
- forming the pressboard into a form of a solid insulator for an electrical apparatus;
- wherein the combined amount of PVAm and PAM in the pressboard is between 0.01% and 20% by weight of the pressboard.
5 more elements
Dependencies are inferred from the claim text.