Method of wrapping mica paper on an electrical conductor and mica paper tape suitable for same

Patent metadata

Field	Value
Publication number	US-11027520-B2
Application number	US-201815928420-A
Country	US
Kind code	B2
Filing date	Mar 22, 2018
Priority date	Jun 12, 2015
Publication date	Jun 8, 2021
Grant date	Jun 8, 2021

Abstract

A tape having a first face comprising a continuous surface of mica paper and a second face comprising a support layer, wherein the mica paper comprises 70 to 99 weight percent mica and 1 to 30 weight percent binder and the support layer comprises a film, a paper, a nonwoven fabric, or a woven fabric; wherein the initial elongation of the support layer is equal to or less than the initial elongation of the mica paper; and wherein the support layer is demountably attached to the mica paper such that when a delamination force of 10 N/10 mm or less is imposed on the support layer it can be separated from the mica paper.

First claim

What is claimed is:

1. A tape having a first face comprising a continuous surface of mica paper and a second face comprising a support layer,
wherein the mica paper consists of 70 to 99 weight percent mica and 1 to 30 weight percent of a binder of aramid fibrids, and optionally, additive fibers or floc;
and the support layer comprises a film, a paper, a nonwoven fabric, or a woven fabric;
wherein the initial elongation of the support layer is equal to or less than the initial elongation of the mica paper; and
wherein the support layer is demountably attached to the mica paper such that when a delamination force of 10 N/10 mm or less is imposed on the support layer it can be separated from the mica paper,
wherein the support layer can withstand a tensile force of at least 50 Newtons per 10 millimeters of width.

2. The tape of claim 1 wherein the additive fibers or floc includes aramid, cellulose, acetate, acrylic, polyolefin, polyamide, polyester, or mixtures thereof.

3. The tape of claim 2 , wherein the additive fibers or floc is aramid floc.

4. The tape of claim 3 , wherein the aramid fibrids and floc are made from poly(metaphenylene isophthalamide).

5. The tape of claim 1 wherein the additive fibers or floc includes glass fiber, rock wool, alumina polycrystal fiber, potassium titanate monocrystal fiber, or mixtures thereof.

Assignees

• Dupont Safety & Construction Inc

Inventors

• Kang Byoung Sam

Classifications

• H02K3/40

  for high voltage, e.g. affording protection against corona discharges · CPC title

• H02K3/30

  Windings characterised by the insulating material · CPC title

• H01B7/40

  with arrangements for facilitating mounting or securing · CPC title

• H01B3/485 Primary

  Other fibrous materials fabric · CPC title

• H01B3/421 Primary

  Polyesters · CPC title