WO1990011605A1 - Cable electrique presentant une meilleure resistance a la flamme - Google Patents

Cable electrique presentant une meilleure resistance a la flamme Download PDF

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Publication number
WO1990011605A1
WO1990011605A1 PCT/US1990/001652 US9001652W WO9011605A1 WO 1990011605 A1 WO1990011605 A1 WO 1990011605A1 US 9001652 W US9001652 W US 9001652W WO 9011605 A1 WO9011605 A1 WO 9011605A1
Authority
WO
WIPO (PCT)
Prior art keywords
recited
coating
compound
silicone
yarn
Prior art date
Application number
PCT/US1990/001652
Other languages
English (en)
Inventor
Donald Mudgett
Original Assignee
Lestox, Inc.
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
Priority claimed from US07/330,008 external-priority patent/US4906308A/en
Priority claimed from US07/329,927 external-priority patent/US4910361A/en
Priority claimed from US07/365,748 external-priority patent/US4966638A/en
Priority claimed from US07/478,600 external-priority patent/US5008495A/en
Application filed by Lestox, Inc. filed Critical Lestox, Inc.
Publication of WO1990011605A1 publication Critical patent/WO1990011605A1/fr

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Classifications

    • 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
    • H01B13/08—Insulating conductors or cables by winding
    • H01B13/0891—After-treatment
    • 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
    • H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
    • H01B13/26—Sheathing; Armouring; Screening; Applying other protective layers by winding, braiding or longitudinal lapping
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
    • H01B7/182—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring comprising synthetic filaments
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/29—Protection against damage caused by extremes of temperature or by flame
    • H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame

Definitions

  • This invention in general relates to an improved electric cable that has better burn resistant characteristics than existing electric cable.
  • the present invention discloses an improved electric cable, and a method for making same, that will produce far less toxic fumes when burned and has better survivability when exposed to fire.
  • a cable according to the present invention is formed by wrapping a glass fiber yarn, such as FiberglasTM yarn around the outer periphery of an electrical conductor.
  • the electrical conductor is sent to a wrapping section where it is wrapped with the yarn and then travels to an impregnating section.
  • the glass fiber yarn is impregnated with a first silicone compound at this impregnating section.
  • the impregnation is controlled so that it does not extend to the inner periphery of the glass fiber yarn, but will saturate the outer periphery of the yarn wrap.
  • the wrapped wire goes into a drying section where the compound is dried within the yarn.
  • the wire then travels to a second coating section where an additional silicone compound is coated upon the outer periphery of the yarn.
  • the wire then enters a second drying section and is then coiled upon a reel for distribution.
  • the electric conductor that is wrapped with the yarn may be a bare electric wire, or it may be an individually insulated group of wires; that is, it may be wrapped around a plurality of individual electric wires to form a multi-strand cable.
  • each individual wire may constitute a wire made according to the process of this invention.
  • the glass fiber yarn is a no-resin or low-resin type glass fiber yarn which has no or little synthetic resin in combination with glass fibers, but instead uses a starch/oil binder. It is believed that the percentage of the binder in the most preferred yarn is also low compared to other similar yarns. Synthetic resins which may be used to make glass fiber yarn could create a smoke more harmful than a smoke from the silicone mixtures which are used as impregnating mixtures in this invention. In a sense, the impregnating first silicone mixture is substituted for a percentage of the synthetic resin that would otherwise be in the glass fiber yarn. The resulting cable will produce a far less toxic smoke than ordinary electric cable in which a glass fiber yarn may have a high synthetic resin content.
  • the silicone mixtures utilized as coatings in this invention include various silicone rubbers that are mixed with both clay and alumina trihydrate.
  • the clay is a refractory clay that has good heat resistant characteristics. These types of clays have typically be utilized in brick making.
  • the resulting silicone mixtures include both alumnia trihydrate and the clay, and have a number of applications in forming various articles, including floor tile. Thus, the mixtures themselves are important features of this invention.
  • Figure 1 is a cross-section through a single strand cable as disclosed by the present invention.
  • Figure 2 is a cross-section through a multi-strand cable as disclosed by the present invention.
  • FIG. 3 is a flowchart showing the process used to create the improved electric cable of the present invention.
  • Figure k illustrates an embodiment of machinery that may be used to create the improved cable of the present invention.
  • Figure 5 is an enlarged section of a portion of the machine illustrated in Figure h.
  • Figure 6 is a cross-section taken along line 6-6 of Figure 5.
  • Figure 7 is an enlarged portion of the machine illustrated in Figure 4 showing the coating section.
  • Figure 8 is an alternative embodiment for the coating section of the machine illustrated in Figure 4.
  • Figure 9 is an alternative embodiment for the wrapping section of the machine illustrated in Figure k .
  • Figure 10 is a cross-section of the alternative embodiment of the wrapping section illustrated in Figure 9.
  • Figure 11 is an alternative embodiment of the electric cable illustrated in Figure 2.
  • Figure 12 is a flowchart of the process that will be utilized to create the alternative embodiment of electric cable illustrated in Figure 11.
  • Figure 13 illustrates an alternative embodiment of the coating section illustrated in Figure 7.
  • FIG. 1 illustrates a cross-section through an electric cable according to the present invention that insulates a single electric conductor.
  • the improved single strand electric cable 20 has a central bare electric wire conductor 22 that is surrounded by glass fiber yarn wraps 24. It is to be understood that the wrap is illustrated in a simplified way. The actual wrap may be of a different configuration and may have several layers. A portion 26 of these wraps that is in contact with electric conductor 22 remains unimpregnated, while an outer portion 28 of wrap 24 is impregnated by a first silicone compound. An outer coating 30 of a second silicone compound is disposed around the glass fiber yarn wrap 24. Fiberglas yarn may be utilized as the glass fiber yarn for the wrap.
  • FIG 2 illustrates the improved multi-strand electric cable 32 according to the present invention.
  • Multi-strand cable is also known as wire-for-plennum.
  • a plurality of insulated single wires 34 are disposed at a central portion of the improved multi-strand cable 32 and may each individually be single strand cables according to the improved electric cable illustrated at 20 in Figure 1. That is, this improved multi-strand cable 32 may be wrapped around single electric wires such as illustrated at 20, or it may be wrapped around ordinary prior art insulated wires.
  • the improved multi-strand cable 32 comprises wraps 24 wrapped around the outer periphery of the multiple single insulated wires 34.
  • the wrap 24 has nonimpregnated section 26 and impregnated section 28 and outer coating 30 similar to the single strand embodiment 20.
  • the electric cables illustrated in Figures 1 and 2 combines the best characteristics of a glass fiber yarn wrap that is resilient and tough and the silicone coating that will provide some flexibility and some unity to the cable. Without the coating compound the glass fiber wrap may fray and may not be adequate for use in an electric cable application. Without a wrap, the silicone compound would not be tough and resistant to abrasion.
  • the overall combination of the glass fiber yarn and silicone*.compound results in an insulation for an electric cable that will create a much less toxic smoke if burned. Also, if the insulation is exposed to fire, it has a much higher burning point than the standard electric cable commonly available today.
  • FIG 3 shows a flowchart of a process for creating an electric cable as illustrated in Figures 1 or 2.
  • Flowchart 36 illustrates a roll of wire 38 that may be a single electric conductor 22 or may have a group of electric conductors such as illustrated in Figure 2 as numeral 34. That is, the roll 38 may dispense a single bare electric conductor 22, or may dispense a group of plural insulated electric conductors 34. Alternatively, a series of rolls 38 may each dispense a single insulated electric conductor 34 and the entire series may result in the plural cables 34 for the multi-strand electric cable as illustrated in Figure 2. From the roll 38, the conductors go into a wrapping section 40 where a glass fiber wrap is disposed around their outer periphery.
  • An impregnating section 42 has a motor that pulls the wire through the wrapping section.
  • a first silicone compound is impregnated into the yarn that has been previously wrapped about the electric conductor. It may be preferable in some instances to have a pulling section pulling the wire intermediate the wrapping and impregnating sections rather than having the impregnating section solely doing the pulling.
  • the wire then travels into a drying section 44 where the silicone compound that has been impregnated into the wrap 24 is dried. As the wire leaves the drying section 44 it enters a coating section 46 where a second silicone compound is coated about the outer periphery of the impregnated wrap.
  • the wire leaves this coating section 46 and then enters a second drying section 48 where the silicone coating is again dried. From drying section 48 the wire enters a coiling section 50 where it is placed back on coils for distribution.
  • a control 52 controls the various motors and pumps that will be necessary to move the wire and insert the silicone compounds to the various sections.
  • wire roll 38 is a standard roll rotatably mounted upon a fixed body or support.
  • a motor 54 is shown as driving the motors associated with the wrapping section 40 and the impregnating section 42.
  • Motor 54 drives a belt 56 that drives a driven element 58.
  • Motor 54 also drives a second belt 60 that drives a second driven element 62 that in turn drives a flexible transmission 64 to drive a driven disc 66 in the impregnating section 42.
  • Wire 68 with a single wrap of yarn is illustrated at 70 and this continues on through the wrapping section 40 to a second yarn wrapping station. Twice wrapped wire is illustrated at 72.
  • a fixed stand or support 84 mounts the wire roll 38, the motor 52 and the driven element 58.
  • a carriage 86, that is part of wrapping section 40 is rotatably mounted upon stand 84.
  • Carriage 86 comprises three plates, a first end plate 88, a central plate 90 and a second end plate 92.
  • Bars 94 connect end plate 88 and central plate 90 and central plate 90 and second end plate 92.
  • Guide elements 96 are mounted on both faces of central plate 90, one facing each of the end plates 88, 92.
  • a first group of spools of glass fiber yarn that are wound along a first direction are illustrated at 98 and a second group of spools of glass fiber yarn that are wrapped in the opposed direction are illustrated at 100.
  • Eyelets 102 extend from guide elements 96 and are each associated with an individual spool of yam 98, 100.
  • yarn leaves spool 98 at a mid-point thereof and is guided through eyelet 102.
  • the yarn is illustrated at 103 as being wrapped upon wire 70 in a first orientation.
  • Spool 100 has yarn wrapped upon it in an opposed direction and this yarn is shown as leaving spool 100 and being guided through eyelet 102.
  • the yarn is illustrated at 104 as being wrapped around wire 72.
  • the opposed orientation of spool elements 98 and 100 result in a first wrapping of yarn that surrounds the wire 70 in a first orientation and a second wrap of yarn around this first wrap in a second orientation.
  • the first orientation may be for instance, clockwise while the second orientation may be counter clockwise.
  • the wire is pulled through the wrapping section 40 by the impregnating section 42.
  • the wrapping section carriage 86 is driven by driven element 58.
  • plates 88, 90, 92, bars 94, spools 98 and 100, guide elements 96 and eyelets 102 all rotate as a unit.
  • the relative speed of rotation of carriage 86 and the pulling speed of the wire is selected to ensure an adequate wrap of glass fiber yarn about the wire.
  • Driven element 58 and plates 88, 90 and 92 each have a central bore that allows the wire 68, 70, 72 to pass therethrough.
  • the bore in central plate 90 is illustrated at 105 in Figure 5.
  • the wire is not rotated with the carriage 86 but is pulled along through the wrapping section 40 by impregnating section 42.
  • the carriage 86 is driven by driven element 58 and yarn is wrapped around wire 70 in a first orientation at 103 and then downstream in a second orientation at 104.
  • the wire thus leaves the wrapping section at 74 with a yarn wrap about its outer periphery.
  • the strands may be initially tied together to begin the wrapping of the strands.
  • the glass fiber yarn is glued to the wire to begin the wrapping process.
  • central plate 90 has bars 94 extending from it towards the second end plate 92 and a guide element 96 fixed to a central portion thereof.
  • Spools 100 can be seen as being mounted at four circumferentially spaced positions on central plate 90 and eyelets 102 can be seen as being associated with each of spools 100 and being fixed to guide element 96.
  • the wire 74 extends through core 105 and is wrapped at 104 with the four strands of glass fiber yarn.
  • the impregnating section 104 consists of a first driven disc 66 that is driven by motor 54.
  • Second disc 106 and third disc 108 are idler discs and are mounted parallel to driven disc 66 on each side thereof.
  • Discs 66, 106 and 108 are each formed with an outer rim 109 that has a groove at its outer periphery to receive the wrapped wire 74.
  • a tank 110 is mounted below the discs 66, 106, 108 and contains a bath 112 of a first silicone compound. The level of silicone compound 112 is preferably kept below the lower most extent of the discs 66, 106, 108.
  • Pump 114 is mounted below tank 110 and is connected to silicone bath 112 by an inlet 116.
  • Pump outlet 118 leads from pump 114 to an injector 120 that may be a small needle, such as a hyperdermic needle.
  • pump 114 sends silicone compound from bath 112 through outlet 118 to injector 120 and the silicone compound is injected onto the glass fiber yarn. It is preferred that only enough compound is injected onto the yarn so as to impregnate a portion of the outer periphery thereof. The compound is prevented from entering the inner periphery of the yarn since this would create an insulation that would be difficult to strip away from the electric conductor.
  • Wire 74 with a wrap that has been impregnated by silicone compound at its outer periphery is then squeezed between discs 66 and 106 in grooves 109. Wire 74 then travels about the lower outer periphery of driven disc 66 and is squeezed between disc 66 and 108 again in grooves 109.
  • drying section 44 has an outer housing 122 and opposed silicone rollers 124. It is preferred that silicone compounds are used to create rollers 124 since the drying section 44 will be at a high temperature and silicone has resistance to these high temperatures.
  • drying section 44 Within drying section 44 are two conventional heat lamps 126 and 128. Other types of drying elements may be utilized.
  • the wrapped, impregnated, dried cable then leaves drying section 44 at 78 and enters a second coating section 46.
  • the second coating section 46 has outer housing 130 and receives a second silicone compound through a first port 132.
  • This second silicone compound is preferably inserted into the housing 130 at a pressure of approximately 40 psi.
  • the compound enters into a chamber 136 where it is allowed to circulate about the electric cable 78 and then leaves through a second port 134. It is important to maintain the circulation of the silicone compound to prevent set-up of the compound.
  • Electric cable 78 is still at a raised temperature since it was recently in drying section 44 and the heated cable attracts the silicone compound to ensure a good outer coating. In an example, the wire was maintained at 450-500° F. and the silicone compound at 0° F.
  • FIG. 7 illustrates a coating section that is preferably used when making multi-strand cable 32.
  • Coating housing 130 consists of a main portion 138 that receives a plug member 139. The use of a plug, such as member 139 allows easy access into housing 130 for cleaning or the like.
  • the wrapped, impregnated, dried, coated wire leaves second coating section 46 at 80 and enters a second drying section 48 that is identical to first drying section 44.
  • the wire leaves this second drying section 48 at 82 and is wound on coil 50.
  • the second embodiment of the second coating section 46 is illustrated in Figure 8. This embodiment is preferably used when making single strand cable 20.
  • This coating section 140 has a coating inlet 142 and a coating outlet 144.
  • a line 146 leads to a vacuum pump.
  • Coating section 140 is preferably mounted extending vertically upwardly. That is, when using coating section 140 it is preferable that the wire leaving drying section 44 is turned directly vertically upwardly into coating section 140.
  • coating section 140 has coating outlet 144 at a lower most vertical position, coating inlet 142 at an intermediate vertical position and a line to vacuum 146 at an uppermost vertical position.
  • Wire 78 can be seen to be entering modified coating section 140 at 78 and leaves modified coating section 140 at 80.
  • the rest of the flow chart 36 and apparatus is identical to that shown in Figures 3 and 4. It is envisioned that a third silicone compound may be preferably used when using coating section 140.
  • Coating section 140 is especially preferred for use in coating a single strand of electric wires such as illustrated in Figure 1.
  • a coating enters 142 into chamber 148 where it contacts the electric cable 78. Electric cable 78 is coated and the coating leaves through port 144. While the coating operation is in effect, vacuum line 146 is closed. When coating is interrupted, vacuum 146 is initiated and inlet 142 and outlet 144 are closed. The opening and closing of the lines is controlled by control valves (not shown) that are mounted in lines 142, 144, and 146. This combination prevents the coating from being exposed to any particular portion of wire for an overly long period of time.
  • Alternative wrapping section 150 has a central plate 152 upon which are mounted spools 154. Cable 68 leaves wire roll 38 similar to wrapping section 40. Guide elements 96 are mounted on central plate 156 and eyelets 156 extend from guide elements 96. Yarn at 158 can be seen to leave the axial end of spool 154 and extend through a S-shaped tube 160. S-shaped tube 160 causes the yarn 158 to go through a tortious series of turns that ensures adequate tension. Yarn at 162 leaves S-shaped tube 160 and is wrapped upon wire 68 similar to wrapping section 44. S-shaped tube 160 may be a clear plastic tube or the like.
  • Figure 10 illustrates first end plate 164 of alternative wrap section 150.
  • Spools 154 illustrated in alternative wrap section 150.
  • Spools 154 may be arranged at the same radial extent, as illustrated in Figure 10, or they may be staggered at various radial positions.
  • alternative wrap section 150 as illustrated in Figures 9 and 10, only a single wrap of glass fiber yarn is applied to cable 68.
  • a second opposed wrap may also be utilized with alternative wrap section 150, similar to the arrangement used in wrap section 40.
  • a no, or low synthetic resin glass fiber yarn is most preferably utilized in the above-described cables.
  • the glass fibers When such a glass fiber yarn is utilized, the glass fibers will be able to "absorb" a greater amount of the silicone mixture.
  • the impregnating silicone mixture will produce a much less harmful smoke when burned then some of the prior art synthetic resin compounds that may have been utilized. For this reason, it is an important object of this invention that a no, or low synthetic resin glass fiber yarn be utilized.
  • a third type of electric cable 166 is illustrated in Figure 11.
  • Cable 166 consists of a series of electric conductors 168 similar to that illustrated in Figure 2, however, rather than using a glass fiber yarn wrap a silicone tape 170 is wrapped about conductors 168.
  • This silicone tape is formed from a silicone compound such as is associated with the various impregnating or coating sections and is made by commonly known processes.
  • An outer coating 172 is placed about silicone tape 170 similar to the coating 46 utilized with the other types of wire.
  • Wire roll 176 contains wire similar to wire roll 38 in the first embodiment.
  • a tape wrapping section 178 contains a tape wrapping machine that wraps the silicone tape around the several electric conductors. Tape wrapping machines are well known for wrapping tape about electric conductors, however, they have not been used with silicone tape.
  • the coated cable then enters drying section 182, again similar to previously described drying sections. From drying section 182 the cable goes to coiling section 184 similar to the previously described coiling section. Control 186 controls the various sections of this process.
  • Coating section 188 is preferably used with a multi-strand cable such as illustrated in Figure 2.
  • Coating section 188 consists of a first coating portion 190, an intermediate cooling portion 192 and a second coating portion 194.
  • First coating portion 190 consists of chamber 196 that surrounds the electric cable and an inlet 198 that receives pressurized silicone compound into chamber 196. The compound is circulated within chamber 196 to prevent it from setting up, and eventually exits through exit 200.
  • the intermediate cooling section 192 consists of a chamber 202 that surrounds the cable and an inlet 204 that supplies cooling fluid to chamber 202.
  • this cooling fluid may consist of water with an additive that has good thermal transfer characteristics, as an example ordinary anti-freeze may be utilized.
  • the cooling fluid circulates through chamber 202 and exits through port 206.
  • Second coating portion 194 has chamber 208 again surrounding the cable and port 210 supplies the silicone compound to the chamber 208.
  • the fluid circulates within chamber 208 and exits through port 212.
  • the wire at 78 enters coating portion 188 through port 213 and is coated within chamber 196. As the wire leaves chamber 196 it goes through guide port 214 separating first coating portion 190 from cooling portion 192.
  • the size of the orifice at guide opening 214 is chosen to be slightly larger than the orifice at opening 213 to accommodate the extra diameter of the wire due to the coating. As an example, it may be .015 inches larger in diameter.
  • Wire leaves cooling chamber 202 through guide opening 216 and enters second coating portion 194. The cable is coated in second coating portion 194 and exits through guide opening 218 at 80.
  • Guide opening 218 is chosen to be slightly larger in diameter than opening 214 or 216, again to accommodate the extra diameter that the wire will now have due to the coating that has been applied in second coating portion 194.
  • the cable at 80 is pulled through the coating section 188 by a force of approximately 150 foot pounds of tension. It is necessary to apply such a large force to pull the wire through coating section 188 since the guide openings 213, 214, 216 and 218 must be approximately the same diameter as the wire to ensure good sealing between chamber 190, 192 and 194.
  • the rollers 124 in drying section 48 will provide the tension to pull the cable through the coating section 188. Lines 198, 200, 204, 206, 210 and 212 may all be provided with control valves.
  • a first compound is envisioned for use with the impregnating section and consists of a silicone compound diluted with a thinner.
  • a silicone compound any type of high voltage insulator coating that is silicone based may be utilized.
  • a vulcanizing silicone rubber is utilized.
  • an amine or oxime cure room temperature vulcanizing silicone rubber with at least 50%, and up to a maximum of 58%, of aluminum trihydrate for fire retardancy.
  • Sylgard available from Dow Corning, Midland, Michigan, may be utilized.
  • an industrial solvent such as inhibited 1,1,1, trichloroethylene is desirable.
  • An example of this compound was produced by mixing 80 percent by volume of the silicone compound high voltage insulator coating and 20 percent by volume of the thinner, the trichloroethylene.
  • a second compound that is envisioned for use with the coating sections, in particular, the first and third embodiment of the coating section, consists of a silicone compound that is mixed with clay and alumina trihydrate. These two additives add flexibility and resiliency to the silicone compound.
  • the silicone compound utilized with this second compound may be any type of silicone compound that has good characteristics as an electric insulator.
  • a liquid Preferably, a liquid
  • TH silicone rubber is utilized.
  • An example may be Silastic , available from Dow Chemical Corning.
  • This product consists of two compounds that are combined to initiate the setting up or curing of the product. The product is described in U.S. Patent No. 3,445,420 entitled "Acetylenic Inhibited Platinum Catalyzed Organopolysiloxane Composition" issued to Kookootsedes, et al. The clay is dried, pulverized and sifted until very fine.
  • a particular clay that was utilized to make the below disclosed examples of this compound consisted of 20 to 30 percent of illite, 10 to 15 percent of vermiculite, 10 to 15 percent of kaolimite, 10 to 15 percent of quartz, less than 5 percent of feltspars, 5 to 10 percent of calcite and 10 to 15 percent of dolomite. These are volume percentages from the dried material and not the original moist clay.
  • the above-described clay is a refractory clay which has good heat resistant characteristics. This type of clay has been utilized in the past in forming bricks which are to be exposed to fire or other sources of high heat. In addition, the following densities of materials were used for the below disclosed examples. The clay weighted
  • TH compounds that make up the Silastic compound were mixed and stored in a container that was maintained at 0° F. for at least twenty-four hours. A vacuum was applied to the container to remove air bubbles. The compound was then ready for use.
  • a third compound is envisioned for use with the coating, in particular for the alternative coating illustrated at Figure 8.
  • This third coating consists of a silicone compound, clay and alumina trihydrate. It is envisioned that the same silicone coating utilized with the first compound may be utilized with this third compound. The clay and alumina trihydrate are similar to that used with the second compound.
  • the clay and alumina trihydrate were initially prepared.
  • Sylgard compound was then stirred into the mixture.
  • the compound may be exposed to some means for maintaining circulation while it is stored but preventing it from set ling-up.
  • the tape and dryer rollers are preferably formed
  • This third compound was produced by mixing 80 percent by volume of the silicone compound, 15 percent by volume of the dry sifted clay and 5 percent by volume of the alumina trihydrate.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Organic Insulating Materials (AREA)

Abstract

L'invention concerne un câble électrique amélioré ainsi que son procédé de fabrication, ayant pour résultat un câble électrique (20, 32) présentant des caractéristiques de résistance à la flamme améliorée. Le procédé amélioré comprend une première partie d'enroulement de fil (40), une partie d'imprégnation (42), une partie de séchage (44), une partie d'enduction (46), une seconde partie de séchage (48), ainsi qu'une partie de bobinage de renvidage du fil. Le procédé consiste à entourer un fil (24) de fibres de verre autour d'un câble électrique (22), puis à imprégner ce fil d'un composé de silicone. Ledit fil imprégné est séché et envoyé à une seconde chambre d'enduction, où un composé de silicone additionnel est enduit autour de la périphérie extérieure dudit fil. Le câble passe dans une seconde partie de séchage, puis dans la partie de bobinage. Selon un second mode de réalisation de cette invention, on utilise une bande de silicone (170), comme enveloppe enroulée autour dudit câble électrique, au lieu du fil en fibres de verre.
PCT/US1990/001652 1989-03-29 1990-03-28 Cable electrique presentant une meilleure resistance a la flamme WO1990011605A1 (fr)

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
US329,927 1989-03-29
US07/330,008 US4906308A (en) 1989-03-29 1989-03-29 Method of making electric cable with improved burn resistance feature
US330,008 1989-03-29
US07/329,927 US4910361A (en) 1989-03-29 1989-03-29 Electric cable with burn resistant features
US07/365,748 US4966638A (en) 1989-06-13 1989-06-13 Silicone mixture and method of using it
US365,748 1989-06-13
US478,600 1990-02-12
US07/478,600 US5008495A (en) 1989-03-29 1990-02-12 Electric cable with burn resistant characteristics and method of manufacture

Publications (1)

Publication Number Publication Date
WO1990011605A1 true WO1990011605A1 (fr) 1990-10-04

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PCT/US1990/001652 WO1990011605A1 (fr) 1989-03-29 1990-03-28 Cable electrique presentant une meilleure resistance a la flamme

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997043968A1 (fr) * 1996-05-22 1997-11-27 Meditec S.R.L. Poignee pour bistouri electrique
EP0906630A1 (fr) * 1996-04-26 1999-04-07 Owens Corning Cable electrique fabrique avec un isolant dielectrique non lineaire en verre et procede de fabrication
WO2002029831A2 (fr) * 2000-10-05 2002-04-11 Electrovations Structure de cable haute temperature
CN112117060A (zh) * 2019-06-20 2020-12-22 耐克森公司 制造耐火和/或阻燃缆线的方法

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EP0906630A1 (fr) * 1996-04-26 1999-04-07 Owens Corning Cable electrique fabrique avec un isolant dielectrique non lineaire en verre et procede de fabrication
EP0906630A4 (fr) * 1996-04-26 2000-11-15 Owens Corning Fiberglass Corp Cable electrique fabrique avec un isolant dielectrique non lineaire en verre et procede de fabrication
WO1997043968A1 (fr) * 1996-05-22 1997-11-27 Meditec S.R.L. Poignee pour bistouri electrique
US6629361B1 (en) 1999-07-30 2003-10-07 Electrovations Method of producing a high temperature electrical conductor
WO2002029831A2 (fr) * 2000-10-05 2002-04-11 Electrovations Structure de cable haute temperature
WO2002029831A3 (fr) * 2000-10-05 2002-07-11 Electrovations Structure de cable haute temperature
CN112117060A (zh) * 2019-06-20 2020-12-22 耐克森公司 制造耐火和/或阻燃缆线的方法
EP3754671A1 (fr) * 2019-06-20 2020-12-23 Nexans Procédé de fabrication d'un câble résistant et/ou retardant au feu
FR3097679A1 (fr) * 2019-06-20 2020-12-25 Nexans Procédé de fabrication d’un câble résistant et/ou retardant au feu
US11837381B2 (en) 2019-06-20 2023-12-05 Nexans Method of manufacturing a fire-resistant and/or fire-retardant cable

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