US2372878A - Insulating sheet or strip - Google Patents

Insulating sheet or strip Download PDF

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Publication number
US2372878A
US2372878A US465794A US46579442A US2372878A US 2372878 A US2372878 A US 2372878A US 465794 A US465794 A US 465794A US 46579442 A US46579442 A US 46579442A US 2372878 A US2372878 A US 2372878A
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US
United States
Prior art keywords
sheet
drum
strip
silk
insulating sheet
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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US465794A
Inventor
Binns Charles Edward
Palmer Stanley
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.)
VERSIL Ltd
Original Assignee
VERSIL Ltd
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Filing date
Publication date
Application filed by VERSIL Ltd filed Critical VERSIL Ltd
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Publication of US2372878A publication Critical patent/US2372878A/en
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
    • C04B26/02—Macromolecular compounds
    • C04B26/10—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C04B26/12—Condensation polymers of aldehydes or ketones
    • C04B26/122—Phenol-formaldehyde condensation polymers
    • 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
    • H01B3/088—Shaping of glass or deposition of glass

Definitions

  • This invention relates to insulating sheets or strips of the kind which are made from glass silk.
  • both sides of the sheet or strip are varnished.
  • the method consists of pre-varnishing the drum, applying a layer o-r layers of glass silk, re-varnishing the drum over the silk and finally baking and removing the silk sheet from the drum.
  • the sheet can be cut into strips before removing it from the drum, the silk being thus removed in the form of a tape.
  • Fig. 1 is a side elevation
  • Fig. 2 is a front view of the drum shown in Fig. 1 on which a sheet has been formed, part of the: said sheet being removed to show the layers of lubricant, varnish, and glass silk.
  • Fig. 3 shows a short length of tape made on the apparatus illustrated in Fig. 1. the layers of the tape being separated to show its construction.
  • a glass furnace 2 and associated spinning bar 3 are arranged above a drum 4 adapted to revolve about a horizontal axis and provided with means for driving it at the desired speed or speeds.
  • the drum is carried by a shaft 5 which is supported in bearings 6 mounted on the framework 1 and is driven by a motor 8, pulleys 9, l0 and a belt II.
  • the glass filaments I2 issuing from the furnace through the spinning bar are guided by a pair of pins l3.
  • the guide is carried by an endlessband it running on rollers or pulleys l5 across the width of thedrum so as to be traversed to and fro by the motor 16 through the gear box H.
  • An eye or other guiding or grouping device or a single inclined pin may be employed instead of the pins l5 if desired.
  • a wheel type cutter i8 is traversed across the face of the drum at the requisite speed by anyrof the usual forms of traversing gear.
  • a movable guide I3 is shown. However, if desired, the guide may be fixed and a movable furnace provided.
  • the drum surface 4 is first lubricated and the lubricant a is allowed to set.
  • the varnish b is then sprayed on to the drum surface 4 and a layer or layers of glass silk c is then wound on to the drum.
  • sufiicient silk c has been wound more varnish d is sprayed on and the whole sheet is baked. The silk is then cut off in sheet or tape form.
  • This method results in a material with a coat of varnish on each side of the glass fibres, having an apparent density of more than 20 lbs. per

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Reinforced Plastic Materials (AREA)
  • Insulating Bodies (AREA)

Description

April 3, 1945. c. E. BINNS ET AL 2,372,878
INSULATING SHEET OR STRIP Filed Nov. 16, 1942 Fatented Apr. 3, 39 35 STATE PATENT OFFEQE INSULATING SHEET OR STRIP Application November 16, 1942, Serial No. 4ii5,794 In-Great Britain September 23, 1942 1 Claim.
This invention relates to insulating sheets or strips of the kind which are made from glass silk.
Previously, such a sheet was formed by windlng layers of glass silk fibres onto a drum and subsequently applying varnish to one side of the glass silk sheet so formed. Any attempt to varnish this sheet in the normal way, that is to say by dipping and baking, caused the sheet to shrink in the weft direction.
According to this invention both sides of the sheet or strip are varnished. The method consists of pre-varnishing the drum, applying a layer o-r layers of glass silk, re-varnishing the drum over the silk and finally baking and removing the silk sheet from the drum. Alternatively, the sheet can be cut into strips before removing it from the drum, the silk being thus removed in the form of a tape.
One form of apparatus for carrying out the present invention is illustrated in the accom panying drawing, wherein:
Fig. 1 is a side elevation;
Fig. 2 is a front view of the drum shown in Fig. 1 on which a sheet has been formed, part of the: said sheet being removed to show the layers of lubricant, varnish, and glass silk.
Fig. 3 shows a short length of tape made on the apparatus illustrated in Fig. 1. the layers of the tape being separated to show its construction. v
Referring to the drawing:
A glass furnace 2 and associated spinning bar 3 are arranged above a drum 4 adapted to revolve about a horizontal axis and provided with means for driving it at the desired speed or speeds. As shown the drum is carried by a shaft 5 which is supported in bearings 6 mounted on the framework 1 and is driven by a motor 8, pulleys 9, l0 and a belt II. The glass filaments I2 issuing from the furnace through the spinning bar are guided by a pair of pins l3. The guide is carried by an endlessband it running on rollers or pulleys l5 across the width of thedrum so as to be traversed to and fro by the motor 16 through the gear box H. An eye or other guiding or grouping device or a single inclined pin may be employed instead of the pins l5 if desired.
For the cutting operation, a wheel type cutter i8 is traversed across the face of the drum at the requisite speed by anyrof the usual forms of traversing gear.
In the apparatus illustrated, a movable guide I3 is shown. However, if desired, the guide may be fixed and a movable furnace provided. The drum surface 4 is first lubricated and the lubricant a is allowed to set. The varnish b is then sprayed on to the drum surface 4 and a layer or layers of glass silk c is then wound on to the drum. When sufiicient silk c has been wound more varnish d is sprayed on and the whole sheet is baked. The silk is then cut off in sheet or tape form.
This method results in a material with a coat of varnish on each side of the glass fibres, having an apparent density of more than 20 lbs. per
cubic foot. The advantages of the material are 7 as follows:
1. It has a greater strength in the weft direction.
2. A higher di-electric strength.
3. A greater resistance to moisture, and
4. An improved surface appearance.
What we claim and desire to secure by Letters Patent is:
Method for making an insulating material CHARLES EDWARD BINNS.
STANLEY PALMER.
US465794A 1942-09-23 1942-11-16 Insulating sheet or strip Expired - Lifetime US2372878A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2372878X 1942-09-23

Publications (1)

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US2372878A true US2372878A (en) 1945-04-03

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3156950A (en) * 1962-05-09 1964-11-17 Rohm & Haas Spinnerets and methods of making them
US3211906A (en) * 1962-03-19 1965-10-12 Rotaflex Ltd Lampshades, diffusers and the like

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3211906A (en) * 1962-03-19 1965-10-12 Rotaflex Ltd Lampshades, diffusers and the like
US3156950A (en) * 1962-05-09 1964-11-17 Rohm & Haas Spinnerets and methods of making them

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