US3434872A - Glass fabric reinforced mica tape and process for production thereof - Google Patents

Glass fabric reinforced mica tape and process for production thereof Download PDF

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Publication number
US3434872A
US3434872A US3434872DA US3434872A US 3434872 A US3434872 A US 3434872A US 3434872D A US3434872D A US 3434872DA US 3434872 A US3434872 A US 3434872A
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US
United States
Prior art keywords
tape
mica
suspension
anode
glass fabric
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
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English (en)
Inventor
Raymond Sidney Ashpole
Thomas William Davidson
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English Electric Co Ltd
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English Electric Co Ltd
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.)
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Publication date
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Publication of US3434872A publication Critical patent/US3434872A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/48—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances fibrous materials
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/82—After-treatment
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D1/00—Electroforming
    • C25D1/12—Electroforming by electrophoresis
    • C25D1/14—Electroforming by electrophoresis of inorganic material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/06—Insulating conductors or cables
    • H01B13/16—Insulating conductors or cables by passing through or dipping in a liquid bath; by spraying
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/002—Inhomogeneous material in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
    • H01B3/04—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances mica
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
    • H01B3/08—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances quartz; glass; glass wool; slag wool; vitreous enamels
    • H01B3/084—Glass or glass wool in binder
    • 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
    • Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
    • Y10T428/251—Mica
    • 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
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/10—Scrim [e.g., open net or mesh, gauze, loose or open weave or knit, etc.]
    • Y10T442/102—Woven scrim
    • Y10T442/172—Coated or impregnated
    • Y10T442/174—Including particulate material other than fiber in coating or impregnation

Definitions

  • This invention relates to insulating materials and to processes for production thereof.
  • a process for the production of an insulating material in tape or sheet form includes the steps of forming a suspension of flakes and/ or fibres of the insulating material in a liquid, passing a porous backing material through said suspension between an anode and a cathode, in close proximity to or in contact with the anode and spaced away from said cathode, and applying a D.C. electrical potential between said anode and said cathode so as to cause flakes or fibres to be deposited on said backing material.
  • an insulating material in tape or sheet form include an openweave reinforcing material and the interstices of the weave contain flakes or fibres of an insulating material.
  • the interstices Preferably contain mica flakes.
  • FIG. 2. shows a modification of FIG. 1.
  • FIG. 3 illustrates a modified process in accordance with the invention.
  • FIG. 4 shows the product resulting from the process of FIG. 3.
  • FIG. 5 shows a further modified process in accordance with the invention.
  • FIG. 6 shows the product resulting from the process of FIG. 5.
  • FIG. 1 there is shown a bath 11 containing a suspension of mica flakes in a mixture of water and acetone, An anode 12 and a cathode 13 are partially immersed in the bath and are spaced apart. Means (not shown) is provided for applying a DC. potential between the anode and the cathode. Glass fabric tape 14 passes from a takeoff reel 15 over suitable rollers 16 through the suspension and over the anode 12. The tape 14 makes contact with the anode 12 over the greater part of the depth of the bath and for some distance above the surface of the suspension.
  • the tape 14 passes over a pulley 17, which is preferably partially evacuated internally, for reasons which will become apparent, and the tape then passes to a drier 18 and take-up spool (not shown).
  • the cathode 13 is fixed at an appropriate distance from the anode, and the glass fabric tape 14 is between the two electrodes.
  • the application of the DC. voltage between the electrodes causes the mica flakes in the suspension to drift towands the anode and therefore to collect on the surface of the tape. The quantity of the flakes collected depends on the time for which the tape remains in the bath.
  • the process has been found to operate successfully over a wide range of electric field intensities; the preferred field intensity between the anode and the cathode is between 0.05 volt per mil and 0.8 volt per mil.
  • the resistivity of the liquid in the bath is preferably greater than 20K ohm cm.
  • the suspension is circulated through the bath 11 from a reservoir 19 containing the bulk of the suspension, the suspension being delivered from the reservoir 19 to the bath 11 through a pipe 20 by means of a circulating pump 21 and being returned from the bath 11 through a pipe 22 to the reservoir.
  • This circulation prevents the settling of the flakes in the suspension and also facilitates the addition of mica flake at intervals to the liquid. in the reservoir, enabling the mica content of the suspension to be maintained.
  • An alternative method of preventing settling is to arrange for the suspension in the bath to be stirred.
  • composition of the suspension was as follows:
  • Ben-a-gel is a propietary suspending agent consisting of highly purified magnesium montmorillonite and is obtainable -from F. W. Berk & Co. Ltd, Berk House, 8 Baker Street, London W. 1.
  • iIn the example glass fabric tape 1 inch wide and 0.005 inch thick was passed through the bath at a speed of up to 8 feet per minute.
  • the depth of the suspension in the bath was approximately 6 inches and the separation between the electrodes was 1 inch.
  • a current of 0.5 amp was passed between the electrodes at volts DC. It was found that mica was deposited on the glass fabric tape to a thickness of 0.002. inch.
  • the use of a partially-evacuated pulley having a porous or mesh surface has been found to help in drying the coated tape.
  • the tape may be passed over a stationary vacuum box.
  • the coated tape can be allowed to dry in air or may be dried by any convenient means.
  • the dried tapes can be sprayed with a suitably diluted resin solution to assist in bonding the mica flakes and the tape, or a resin may be included in the suspension, provided that it does not interfere with the electro-deposition of the flakes.
  • an anode 32 in the form of an endless belt passing over pulleys 33.
  • FIG. 3 there is shown a process for producing a mica tape reinforced by open weave glass tape, instead of the use of the glass fabric backing tape.
  • the use of an open weave tape reduces the ratio of glass to mica in the final product, it is also found that the mica flakes adhere better to the open weave glass tape.
  • the processes of the invention were developed for the preparation of mica tape from mica flake reconstituted from scrap mica.
  • Various methods of reconstituting mica are kn own. It has been found that a particular property of such mica flakes is their ability to bond together due to natural cohesive forces, without the addition of bonding agents. It is this self-bonding effect of the reconstituted mica flakes which enables the reinforcing open weave glass tape to remain in place within the body of the mica tape.
  • the open weave tape 34 is fed through the coating bath 11 at the same time as the glass fabric tape 14, from a take-off roller 3-5, and passed through the suspension a-djacent to the glass fabric tape 14 and between the glass fabric tape and the cathode 1.3.
  • the open Weave tape 34 becomes embedded, since some of the mica flakes penetrate the open weave and fill in the interstices of the Wave.
  • the glass fabric backing tape 14 is removed, leaving the mica tape reinforced by the open weave glass fabric.
  • the glass fabric backing tape can be in the form of an endless belt, as it does not form part of the final product.
  • the product is illustrated in FIG. 4, showing the removal of the backing tape.
  • the open weave fabric can be embedded to a greater depth in the mica flakes by the further modification shown.
  • the open weave tape 44 is taken from the take-off reel 45 and passes round a pulley 46 in the coating bath 11 so arranged that the open weave tape 44 is separated from the backing tape 14 at the lower end of the anode 12, and the build-up of mica flakes on the backing tape 14 reaches the open weave fabric at an intermediate point along the anode and further build-up of mica flakes then takes place in the interstices of the open weave fabric and on the side of the fabric toward the cathode.
  • FIG. 6 which also shows the removal of the glass fabric backing tape 14.
  • a bonding resin may be used if desired in each of the modifications described. Ordinary mica splittings produced by the breaking up of block mica do not have such a marked self-bonding action as reconstituted mica flakes, and thus where this type of material is used a bonding agent will probably be found necessary.
  • a process for making mica tape reinforced with glass fibre wherein a glass fibre fabric reinforcing strip is passed through a suspension of mica pulp, in liquid, there being an anode immersed in said suspension and arranged adjacent and parallel to the reinforcing strip, and a DO electric current being applied between the anode and a cathode which is immersed in the suspension with the reinforcing strip between cathode and anode, so that mica is deposited electrophoretically on the reinforcing strip.
  • said reinforcing strip is of open-weave glass fibre fabric so that mica can lodge between the threads thereof, a backing strip impervious to the mica being passed between the anode and the reinforcing strip.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Inorganic Chemistry (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Physics & Mathematics (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Molecular Biology (AREA)
  • Electrochemistry (AREA)
  • Insulating Bodies (AREA)
  • Paper (AREA)
  • Laminated Bodies (AREA)
  • Reinforced Plastic Materials (AREA)
US3434872D 1964-08-17 1965-08-02 Glass fabric reinforced mica tape and process for production thereof Expired - Lifetime US3434872A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3350164A GB1119441A (en) 1964-08-17 1964-08-17 Improvements in or relating to processes for the production of electrically insulating materials

Publications (1)

Publication Number Publication Date
US3434872A true US3434872A (en) 1969-03-25

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US3434872D Expired - Lifetime US3434872A (en) 1964-08-17 1965-08-02 Glass fabric reinforced mica tape and process for production thereof

Country Status (5)

Country Link
US (1) US3434872A (fr)
BE (1) BE667960A (fr)
CH (2) CH446461A (fr)
DE (1) DE1279155B (fr)
GB (1) GB1119441A (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4089765A (en) * 1973-12-14 1978-05-16 Canada Wire And Cable Limited Electroimpregnation of paper and non-woven fabrics
EP0044160A1 (fr) * 1980-07-11 1982-01-20 Imperial Chemical Industries Plc Matériaux composites fibreux et leur fabrication et utilisation
USRE34020E (en) * 1980-07-11 1992-08-04 Imperial Chemical Industries Plc Fibrous composite materials and the production and use thereof
CN112420242A (zh) * 2020-10-14 2021-02-26 扬州市金华铜业有限公司 一种复合增强自粘云母带及其制备方法
WO2022166019A1 (fr) * 2021-02-04 2022-08-11 湖北平安电工科技股份公司 Procédé de préparation de ruban couché et ignifugé de mica

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2308478A1 (fr) * 1975-04-25 1976-11-19 Chronberg Sten Procede et machine pour la preparation d'un materiau en plaque constitue de particules agglomerees et produits notamment ceramiques obtenus

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1641322A (en) * 1921-10-15 1927-09-06 Czapek Emil Process for the production of filmlike bands from cellulose solutions and similar initial materials
US2393068A (en) * 1939-08-12 1946-01-15 Ruben Samuel Electrodeposition of insulating materials
DE1081091B (de) * 1955-06-09 1960-05-05 Lokomotivbau Elektrotech Verfahren zur Herstellung von Schicht-Isolierstoffbahnen aus Glimmerpulpe
US3001571A (en) * 1957-08-05 1961-09-26 Minnesota Mining & Mfg Synthetic mica flakes and structures
DE1137372B (de) * 1953-07-20 1962-09-27 Siemens Ag Verfahren zur Herstellung eines glimmerhaltigen papier- oder pappen-foermigen Isolationsmaterials

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE888539C (de) * 1945-02-06 1953-09-03 Lorenz C Ag Elektrophoretisches Bad
DE1007593B (de) * 1954-11-04 1957-05-02 Siemens Ag Glimmerpuelpe und Verfahren zur elektrophoretischen Herstellung von Glimmerschichten
DE1011695B (de) * 1955-09-22 1957-07-04 Siemens Ag Verfahren zur Verbesserung der Haftfestigkeit von elektrophoretisch aus einer Puelpe kalzinierten Glimmers niedergeschlagenen Glimmerschichten
DE1011696B (de) * 1955-11-12 1957-07-04 Siemens Ag Verfahren zur elektrophoretischen, kontinuierlichen Herstellung von zusammenhaengenden Bahnen aus einer Puelpe kalzinierten Glimmers
GB991477A (en) * 1962-03-27 1965-05-12 Heinrich Sommermeyer Improvements in or relating to through flow filters

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1641322A (en) * 1921-10-15 1927-09-06 Czapek Emil Process for the production of filmlike bands from cellulose solutions and similar initial materials
US2393068A (en) * 1939-08-12 1946-01-15 Ruben Samuel Electrodeposition of insulating materials
DE1137372B (de) * 1953-07-20 1962-09-27 Siemens Ag Verfahren zur Herstellung eines glimmerhaltigen papier- oder pappen-foermigen Isolationsmaterials
DE1081091B (de) * 1955-06-09 1960-05-05 Lokomotivbau Elektrotech Verfahren zur Herstellung von Schicht-Isolierstoffbahnen aus Glimmerpulpe
US3001571A (en) * 1957-08-05 1961-09-26 Minnesota Mining & Mfg Synthetic mica flakes and structures

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4089765A (en) * 1973-12-14 1978-05-16 Canada Wire And Cable Limited Electroimpregnation of paper and non-woven fabrics
EP0044160A1 (fr) * 1980-07-11 1982-01-20 Imperial Chemical Industries Plc Matériaux composites fibreux et leur fabrication et utilisation
USRE34020E (en) * 1980-07-11 1992-08-04 Imperial Chemical Industries Plc Fibrous composite materials and the production and use thereof
CN112420242A (zh) * 2020-10-14 2021-02-26 扬州市金华铜业有限公司 一种复合增强自粘云母带及其制备方法
WO2022166019A1 (fr) * 2021-02-04 2022-08-11 湖北平安电工科技股份公司 Procédé de préparation de ruban couché et ignifugé de mica

Also Published As

Publication number Publication date
GB1119441A (en) 1968-07-10
CH463588A (fr) 1968-10-15
BE667960A (fr) 1966-02-07
CH446461A (fr) 1967-11-15
DE1279155B (de) 1968-10-03

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