US1440448A - Varnish film for insulating purposes - Google Patents

Varnish film for insulating purposes Download PDF

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Publication number
US1440448A
US1440448A US271546A US27154619A US1440448A US 1440448 A US1440448 A US 1440448A US 271546 A US271546 A US 271546A US 27154619 A US27154619 A US 27154619A US 1440448 A US1440448 A US 1440448A
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US
United States
Prior art keywords
varnish
foil
film
insulating material
insulating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US271546A
Inventor
Paul E Demmler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CBS Corp
Original Assignee
Westinghouse Electric and Manufacturing Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Westinghouse Electric and Manufacturing Co filed Critical Westinghouse Electric and Manufacturing Co
Priority to US271546A priority Critical patent/US1440448A/en
Application granted granted Critical
Publication of US1440448A publication Critical patent/US1440448A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D7/00—Producing flat articles, e.g. films or sheets
    • B29D7/01—Films or sheets
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913—Rod, strand, filament or fiber
    • Y10T428/2933—Coated or with bond, impregnation or core
    • Y10T428/294—Coated or with bond, impregnation or core including metal or compound thereof [excluding glass, ceramic and asbestos]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31678—Of metal
    • Y10T428/31714—Next to natural gum, natural oil, rosin, lac or wax

Definitions

  • My invention relates to electrical insulating material and it has, for its primary ob- ⁇ ject, -the provision Vof a method by which relatively thin sheets of such material having a high dielectric strength .may be formed.
  • One object of my invention is ⁇ to provid an insulating material in 4bthe form of a relatively -thinres'ilient sheet possessing great tensile strength, as well as high dielectric strength. .l
  • Another object of my invention is the provision of such 'insulating ma'telrial by amethod which shall promote rapid production thereof.
  • a still further object lf'my invention is the provisionof' relatively thin sheets which may be made any desired thickness and of i any length convenient to handle.
  • Fig. l is a sectional view parts being broken away, of a metal foil.
  • Fig. 2 is a sectional view, parts being broken away, of a lm di' insulating material
  • Fig. 3 is a plan view, parts being broken away,.of the film of insulating materia -A shownin Fig. 2.
  • I may 'provide insulating material by employing metal foil and subjecting it to treatment in a bath of insulating material sufiiciently adhesive tocoat the metal foil, after which the foil maybe drawn throughV a. drying tower to thoroughly dry the coating of insulating material. Afterl the foil has been coated and the lcoating dried, the insulating mate- -1 E. DEMMLER, a
  • the width and length of the foil and, consequently, the coating of varnish may beregulated as desired.
  • the film of varnish covering either or both vsides of the foil may be removed therefrom to pro ⁇ vide relatively thin, tough sheets of material possessing a high dielectric strength.
  • the lm may be removed more readily by subjecting the foil coated Withthe varnish to a bath in molten parafine containing 10% carnauba wax, and allowing it to remain for several hours therein. This has a tendency to toughen the film. 'and to reduce its adhesion to the foil to such an extent that it maybe more readily removed therefrom.
  • a method of making insulating material that comprises drawing a metal foil 'through a bath of baking varnish, drying the varnish on .the foil, disposing the foil in molten paraiine containing Y10% carnauba wax and removing the varnish by stripping a continuous film from each side of the foil.
  • Electrical insulating material comprising a self-sustaining lilm of baking varnish.
  • 6.1Electrical insulating material comprising a resilient self-sustaining sheet of baking varnish.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paints Or Removers (AREA)
  • Insulating Bodies (AREA)

Description

Jan. 2, 1923. 1,440,448
P. E. DEMMLER. VARNISH FILM FOR INSULATING PURPOSES.
FrLEDJAN. 16, 1919.
WITNESSES:
hantai Jan. 2, 1923.
UNITED sTATEs `vPATENT OFFICE.
yPAUL E. DEMMLER, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOB -TO WESTINGHOUSE ELECTRIC & MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.
VARNISH FILM FOB INSULATING PURPOSES.
Application led anuary 16, 1919. Serial No. 271,546.`
To all whom t may cofwern:
Be it known that I, PAUL citizen ofthe United States, and a resident of'Pittsbui-gh, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Varnish Films for Insulating Purposes, of which the following is. a specification.
My invention relates to electrical insulating material and it has, for its primary ob- `ject, -the provision Vof a method by which relatively thin sheets of such material having a high dielectric strength .may be formed.
One object of my invention is` to provid an insulating material in 4bthe form of a relatively -thinres'ilient sheet possessing great tensile strength, as well as high dielectric strength. .l
Another object of my invention is the provision of such 'insulating ma'telrial by amethod which shall promote rapid production thereof.
A still further object lf'my invention is the provisionof' relatively thin sheets which may be made any desired thickness and of i any length convenient to handle.
A With these'and other objects in view, my invention will be more fully described, illustrated in the drawings, in the several views of which correspon ing .numerals indicate' particularly pointed out like parts, and then in the' claims. f
In the drawings, Fig. l is a sectional view parts being broken away, of a metal foil.
having a coating of insulating material; Fig. 2 is a sectional view, parts being broken away, of a lm di' insulating material, and Fig. 3 is a plan view, parts being broken away,.of the film of insulating materia -A shownin Fig. 2.
In practising my invention, I may 'provide insulating material by employing metal foil and subjecting it to treatment in a bath of insulating material sufiiciently adhesive tocoat the metal foil, after which the foil maybe drawn throughV a. drying tower to thoroughly dry the coating of insulating material. Afterl the foil has been coated and the lcoating dried, the insulating mate- -1 E. DEMMLER, a
oughly, it may be subjected to heat at substantially 2000 to 210o C..so as to keep well 'below the possible softening point of the foil. The rate of movement of the film through a drying tower, where such heat is employed, will depend upon the length of the drying tower, care being takernto insure the varnish or coating on the foil being satisfactorily dried. I
Obviously, the width and length of the foil and, consequently, the coating of varnish may beregulated as desired. After the foil has beensubjected to thebath inthe varnish and the varnish has been dried, the film of varnish covering either or both vsides of the foil may be removed therefrom to pro` vide relatively thin, tough sheets of material possessing a high dielectric strength. In some instances, the lm may be removed more readily by subjecting the foil coated Withthe varnish to a bath in molten parafine containing 10% carnauba wax, and allowing it to remain for several hours therein. This has a tendency to toughen the film. 'and to reduce its adhesion to the foil to such an extent that it maybe more readily removed therefrom.
0n account of the -characteristics possessed by a film of insulating material pro` vided asabove described, a wide variety of uses may be found'therefor. Its inherent tensile strength, coupled with its-resiliency,
allows its application in many electrical devices. For example, itmay be utilized in any device where mica or similar insulating have described, Specifically, a' l through a bath of baking varnish, drying the varnish on the foil, disposing the foil in molten Wax and removing the varnish by strippinga continuous film from each sideA of the foil. I
3. A method of making insulating material that comprises drawing a metal foil 'through a bath of baking varnish, drying the varnish on .the foil, disposing the foil in molten paraiine containing Y10% carnauba wax and removing the varnish by stripping a continuous film from each side of the foil.
LA method of making insulating material'thatcomprises forming' a film of baking varnish upon a metal foil comprising substantially 85% lead and 15% tin and removing the film therefrom.
5. Electrical insulating material comprising a self-sustaining lilm of baking varnish.
6.1Electrical insulating material comprising a resilient self-sustaining sheet of baking varnish.
In testimony whereof, I' haveA hereunto subscribed my name this 31st day of Dec. 1918. 4
PAUL E. DEMMLER.
US271546A 1919-01-16 1919-01-16 Varnish film for insulating purposes Expired - Lifetime US1440448A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US271546A US1440448A (en) 1919-01-16 1919-01-16 Varnish film for insulating purposes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US271546A US1440448A (en) 1919-01-16 1919-01-16 Varnish film for insulating purposes

Publications (1)

Publication Number Publication Date
US1440448A true US1440448A (en) 1923-01-02

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