EP0575403A1 - Improvements in and relating to incandescent mantles. - Google Patents

Improvements in and relating to incandescent mantles.

Info

Publication number
EP0575403A1
EP0575403A1 EP92906280A EP92906280A EP0575403A1 EP 0575403 A1 EP0575403 A1 EP 0575403A1 EP 92906280 A EP92906280 A EP 92906280A EP 92906280 A EP92906280 A EP 92906280A EP 0575403 A1 EP0575403 A1 EP 0575403A1
Authority
EP
European Patent Office
Prior art keywords
mantle
tie cord
cord according
tie
binder
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.)
Granted
Application number
EP92906280A
Other languages
German (de)
French (fr)
Other versions
EP0575403B1 (en
Inventor
Brian Steven Kennedy
Peter Hayhurst
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.)
TBA Industrial Products Ltd
Original Assignee
TBA Industrial Products 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.)
Filing date
Publication date
Application filed by TBA Industrial Products Ltd filed Critical TBA Industrial Products Ltd
Publication of EP0575403A1 publication Critical patent/EP0575403A1/en
Application granted granted Critical
Publication of EP0575403B1 publication Critical patent/EP0575403B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21H—INCANDESCENT MANTLES; OTHER INCANDESCENT BODIES HEATED BY COMBUSTION
    • F21H1/00—Incandescent mantles; Selection of imbibition liquids therefor
    • F21H1/04—Suspension devices therefor

Definitions

  • a mantle for these purposes consists essentially of a bag which is secured over a gas supply jet, combustion taking place on the surface of the mantle, the structure of which is raised to white hot temperatures very rapidly.
  • Mantles are made from fibres which have good resistance to high temperatures, such as asbestos or glass. It will be noted that structural integrity is important, although it is normally accepted that after its first use, a mantle becomes extremely brittle and/or fragile. However, at the time of installation it is a loose, floppy bag and it is usual to provide a tie yarn in the form of a drawcord which can be used to secure the mantle in place.
  • the traditional material for the tie yarn was an asbestos based cord.
  • Substitutes for asbestos have included glass fibre yarns with an outer layer of cotton. However, these have poor knot strength and poor performance at elevated temperatures.
  • a continuous filament glass fibre yarn with organic fibres such as acrylic, viscose and aramid staple fibres bonded to it in a generally parallel arrangement has also been tried, the organic component burning off in service to leave the glass core.
  • knot strength is still a problem and aramid fibres are costly.
  • an incandescent mantle tie cord comprises a continuous filament core of a refractory fibre with a cellulose outer sheath of staple fibres and a continuous filament yarn.
  • Refractory fibre for present purposes means a fibre which will not ordinarily fuse together at the working temperature of a naturally aspirated liquified petroleum gas (LPG) flame. Working temperatures in the range of about 750°C to about 900 C are typical of such LPG flames.
  • a particularly preferred refractory fibre is silica.
  • the staple fibres and the continuous filament yarn are preferably of regenerated cellulose; they are applied to the refractory fibre yarn by winding and/or wrapping them onto the refractory fibre core, for example by use of the DREF spinning process.
  • the cord may be treated with a binder to reduce hairiness.
  • the binder may be an aqueous polyvinyl acetate ethylene oxide copolymer solution or dispersion. Starch or acrylic polymer dispersions may also be used. Viscose is a preferred regenerated cellulose material.
  • the tie cord of this invention can be coloured, for example by including a dyestuff in the binder, though it is also possible to dye the staple fibres. Colouring the tie cord facilitates its identification by a user.
  • tie cord of this invention has sufficient integrity to hold a mantle in place until its shape is effectively fixed by the heat developed in use, even though the regenerated cellulose carbonises to a very weak or even non-existent state after a fairly short time.
  • a continuous filament core of two-ply 68 tex silica yarn was wrapped with 68 tex staple viscose (38 mm 1.7 dtex fibres) and a 122 tex continuous filament viscose strand to form a sheath.
  • the wrapping was carried out on a DREF spinning machine.
  • a polyvinyl acetate binder containing a dye was applied to the finished cord, which had the following composition by weight.
  • the cord thus produced had good handling properties and could be knotted without significant damage to the silica.

Abstract

An incandescent mantle tie cord comprises a continuous filament core of a refractory fibre with a cellulosic outer sheath of staple fibres and a continuous filament yarn.

Description

Improvements in and relating to incandescent mantles
This invention relates to incandescent mantles for use in gas fired lanterns. A mantle for these purposes consists essentially of a bag which is secured over a gas supply jet, combustion taking place on the surface of the mantle, the structure of which is raised to white hot temperatures very rapidly.
Mantles are made from fibres which have good resistance to high temperatures, such as asbestos or glass. It will be noted that structural integrity is important, although it is normally accepted that after its first use, a mantle becomes extremely brittle and/or fragile. However, at the time of installation it is a loose, floppy bag and it is usual to provide a tie yarn in the form of a drawcord which can be used to secure the mantle in place.
The traditional material for the tie yarn was an asbestos based cord. Substitutes for asbestos have included glass fibre yarns with an outer layer of cotton. However, these have poor knot strength and poor performance at elevated temperatures.
A continuous filament glass fibre yarn with organic fibres such as acrylic, viscose and aramid staple fibres bonded to it in a generally parallel arrangement has also been tried, the organic component burning off in service to leave the glass core. However, knot strength is still a problem and aramid fibres are costly.
According to this invention an incandescent mantle tie cord comprises a continuous filament core of a refractory fibre with a cellulose outer sheath of staple fibres and a continuous filament yarn. Refractory fibre for present purposes means a fibre which will not ordinarily fuse together at the working temperature of a naturally aspirated liquified petroleum gas (LPG) flame. Working temperatures in the range of about 750°C to about 900 C are typical of such LPG flames. A particularly preferred refractory fibre is silica. The staple fibres and the continuous filament yarn are preferably of regenerated cellulose; they are applied to the refractory fibre yarn by winding and/or wrapping them onto the refractory fibre core, for example by use of the DREF spinning process. The cord may be treated with a binder to reduce hairiness. The binder may be an aqueous polyvinyl acetate ethylene oxide copolymer solution or dispersion. Starch or acrylic polymer dispersions may also be used. Viscose is a preferred regenerated cellulose material.
The tie cord of this invention can be coloured, for example by including a dyestuff in the binder, though it is also possible to dye the staple fibres. Colouring the tie cord facilitates its identification by a user.
It has been found that the tie cord of this invention has sufficient integrity to hold a mantle in place until its shape is effectively fixed by the heat developed in use, even though the regenerated cellulose carbonises to a very weak or even non-existent state after a fairly short time.
In order that the invention be better understood a preferred embodiment of it will now be described by way of example.
Example
A continuous filament core of two-ply 68 tex silica yarn was wrapped with 68 tex staple viscose (38 mm 1.7 dtex fibres) and a 122 tex continuous filament viscose strand to form a sheath. The wrapping was carried out on a DREF spinning machine. A polyvinyl acetate binder containing a dye was applied to the finished cord, which had the following composition by weight. Silica 40%
Continuous filament viscose 32%
Staple viscose fibres 18%
Polyvinyl acetate binder 9%
Dye 1%
The cord thus produced had good handling properties and could be knotted without significant damage to the silica.

Claims

CLA IMS
1. A mantle tie cord comprising a continuous multi-filament core of refractory fibre with a cellulosic outer sheath of staple fibres and a continuous filament yarn.
2. A mantle tie cord according to claim 1 wherein the refractory fibre is silica.
3. A mantle tie cord according to claim 1 or claim 2 wherein the sheath comprises regenerated cellulose fibres.
4. A mantle tie cord according to claim 3 wherein the regenerated cellulose is viscose.
5. A mantle tie cord according to any of claims 1-4 further comprising a binder composition.
6. A mantle tie cord according to claim 5 wherein the binder is a polyvinyl acetate composition, or starch, or acrylic polymer dispersions.
7. A mantle tie cord according to claim 5 or claim 6 wherein the binder further comprises a dye.
8. A mantle tie cord substantially as hereinbefore described with reference to and as illustrated by the example.
EP92906280A 1991-03-14 1992-03-11 Improvements in and relating to incandescent mantles Expired - Lifetime EP0575403B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB919105396A GB9105396D0 (en) 1991-03-14 1991-03-14 Improvements in and relating to incandescent mantles
GB9105396 1991-03-14
PCT/GB1992/000432 WO1992016788A1 (en) 1991-03-14 1992-03-11 Improvements in and relating to incandescent mantles

Publications (2)

Publication Number Publication Date
EP0575403A1 true EP0575403A1 (en) 1993-12-29
EP0575403B1 EP0575403B1 (en) 1995-11-15

Family

ID=10691560

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92906280A Expired - Lifetime EP0575403B1 (en) 1991-03-14 1992-03-11 Improvements in and relating to incandescent mantles

Country Status (6)

Country Link
EP (1) EP0575403B1 (en)
AT (1) ATE130422T1 (en)
DE (1) DE69206134T2 (en)
ES (1) ES2079859T3 (en)
GB (2) GB9105396D0 (en)
WO (1) WO1992016788A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE50203024D1 (en) 2001-08-24 2005-06-09 Georg Issakides BINDING GUN FOR LIGHT BODIES AND THEIR USE
DE10159530A1 (en) * 2001-12-05 2003-06-26 Georg Issakides Asbestos-free, silica binding thread for incandescent mantles of gas lamps, undergoes less than fifty percent diameter shrinkage when flamed
DE10140654A1 (en) * 2001-08-24 2003-03-06 Georg Issakides Asbestos-free, silica binding thread for incandescent mantles of gas lamps, undergoes less than fifty percent diameter shrinkage when flamed

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191318173A (en) * 1913-08-09 1914-01-08 Jacob Ignot Robin Improvements in or relating to Incandescent Gas Mantles.
FR906247A (en) * 1942-11-28 1945-12-27 Auergesellschaft Ag Tie wire for incandescent sleeves
FR2306957A1 (en) * 1975-04-09 1976-11-05 Frenzelit Asbestwerk Alumina silicate and asbestos fibres-contg. insulation - also contg. metal or graphite fibres
US4381639A (en) * 1980-06-19 1983-05-03 Record Industrial Company Sheath-core yarn for severe thermal protecting fabrics and method therefor
US4863799A (en) * 1986-05-22 1989-09-05 Hoechst Celanese Corp. Sheath core spun organosilicon preceramic fibers and processes for production

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9216788A1 *

Also Published As

Publication number Publication date
GB2253640A (en) 1992-09-16
GB9105396D0 (en) 1991-05-01
DE69206134T2 (en) 1996-05-09
GB2253640B (en) 1994-08-24
DE69206134D1 (en) 1995-12-21
GB9205214D0 (en) 1992-04-22
ES2079859T3 (en) 1996-01-16
ATE130422T1 (en) 1995-12-15
EP0575403B1 (en) 1995-11-15
WO1992016788A1 (en) 1992-10-01

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