Aramid paper laminate
OwnerDariusz Wlodzimierz Kawka, David Wayne Andersoninventors
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Abstract
A laminate of aramid nonwoven sheet and polyester resin having an overall thickness of 5 to 25 mils (0.13 to 6.4 mm) and having an elongation at break of at least 40% in both the cross and machine direction and an average tear load in excess of 1.5 pounds-force (6.7 newtons) in both the cross and machine directions.
Claims20
A laminate comprising aramid nonwoven sheet and polyester resin having an overall thickness in a range from of 5 to 25 mils (0.13 to 0.61 mm) and having an elongation at break of at least 40% in both cross and machine directions and an average tear load in excess of 1.5 pounds-force (6.7 newtons) in both the cross and machine directions.
A method of making a laminate useful in electrical insulation, comprising:
- a) providing two aramid nonwoven sheets to the nip between a pair of rolls,
- b) extruding a molten polyester polymer between the two aramid sheets prior to or into the nip between the pair of rolls,
- c) consolidating the aramid sheets and molten polymer between the rolls to form an unquenched laminate, and
- d) cooling the unquenched laminate.
A method of making a laminate useful in electrical insulation, comprising:
- a) providing two aramid sheets to the nip between a pair of rolls,
- b) extruding a molten polyester polymer between the two aramid sheets prior to or into the nip between the pair of rolls,
- c) consolidating and quenching the aramid webs and molten polymer between the rolls to form the laminate.
A transformer containing a dielectric insulation laminate comprising aramid nonwoven sheet and polyester resin having an overall thickness in a range of 5 to 25 mils (0.13 to 0.64 mm) and having an elongation at break of at least 40% in both cross and machine directions and an average tear load in excess of 1.5 pounds-force (6.7 newtons) in both cross and machine directions.
Dependencies are inferred from the claim text.