ELECTRICAL INSULATING PAPER

The present invention pertains to an electrical insulating paper comprising 40-80 wt.% of aramid fibrid, 10-50 wt.% of aramid pulp, and 10-50 wt.% of aramid short-cut, the aramid pulp being para-aramid pulp with a length of 0.5-6 mm and a Schopper Riegler of 15-85. Preferably, the fibrid is para-ara...

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Bibliographic Details
Main Authors ROLINK, Ben, DIEDERING, Frank, VISSER, Richard
Format Patent
LanguageEnglish
French
German
Published 22.01.2020
Subjects
BASIC ELECTRIC ELEMENTS
CABLES
CONDUCTORS
ELECTRICITY
IMPREGNATING OR COATING OF PAPER
INSULATORS
PAPER NOT OTHERWISE PROVIDED FOR
PAPER-MAKING
PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D
PRODUCTION OF CELLULOSE
PULP COMPOSITIONS
SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING ORDIELECTRIC PROPERTIES
TEXTILES
TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G
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Summary:The present invention pertains to an electrical insulating paper comprising 40-80 wt.% of aramid fibrid, 10-50 wt.% of aramid pulp, and 10-50 wt.% of aramid short-cut, the aramid pulp being para-aramid pulp with a length of 0.5-6 mm and a Schopper Riegler of 15-85. Preferably, the fibrid is para-aramid fibrid and/or the shortcut is para-aramid shortcut. More preferably, the fibrid is para-aramid fibrid, and the shortcut is para-aramid shortcut. It has been found that a paper meeting the above requirements shows an increased value for the product of the dielectric strength (expressed in kV/mm) and the tensile index (expressed in Nm/g), as compared to systems comprising only two of the cited components, or less than 40 wt.% of aramid fibrid. The paper is relatively easy to manufacture, and has good tear strength. The paper is particularly suitable for use in insulated conductors.
Bibliography:Application Number: EP20180163015