US3635454A - Apparatus and process for the removal of insulation from wire - Google Patents

Apparatus and process for the removal of insulation from wire Download PDF

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Publication number
US3635454A
US3635454A US35359A US3635454DA US3635454A US 3635454 A US3635454 A US 3635454A US 35359 A US35359 A US 35359A US 3635454D A US3635454D A US 3635454DA US 3635454 A US3635454 A US 3635454A
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US
United States
Prior art keywords
gas
wire
insulation
insulation material
preselected
Prior art date
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Expired - Lifetime
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US35359A
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English (en)
Inventor
Raymond W Angelo
Howard G Houghtalen
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International Business Machines Corp
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International Business Machines Corp
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Publication date
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Publication of US3635454A publication Critical patent/US3635454A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
    • H02G1/12—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for removing insulation or armouring from cables, e.g. from the end thereof
    • H02G1/1275—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for removing insulation or armouring from cables, e.g. from the end thereof by applying heat
    • 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
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • 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
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49995—Shaping one-piece blank by removing material

Definitions

  • This invention relates to the apparatus and: process for removal of insulationmaterial from wire, and more particularly, to the removal of organic materials such as polytetrafluorethylene or fluorinated ethylene-propylene films which function as insulating covers for fine or superfine electrically conductive wire sometimes identified as microfine wire.
  • U.S. Pat. No. 2,73l,372 discloses apparatus to complete an imperfect stripping of the ends of wires by a supplemental operation involving the burning of the remnant insulation in a gas flame. ln U.S. Pat. No. 2,713,372 apparatus is disclosed which includes a provision for removing theinsulation from the ends of wire by charting the insulation through the-application of an acetylene flame. The charred insulation is then removed and the wire cleaned by the abrading action of a wire brush.
  • the apparatus and process of the instant invention provides a means for. removing the insulation from superfine or microwire with diameters of less than 20 mils.
  • the apparatus is particularly adapted to accommodate wire coatings with the newer Teflon-type insulation materials made of TFE or FEP polymers.
  • the apparatus comprises a supply of nitrogen gas, a device to regulate the flow of the gas, controllable gas-heating means, a quartz tube having a small orifice therein for directing the flow of heated gas, and means to feed insulated microwire past the orifice in the quartz tube.
  • the apparatus includes a circuit and test apparatus for testing the area of insulation removal to determine if the insulation has been satisfactorily removed from the selected portion of the microwire.
  • FIGURE is a diagrammatic showing of the insulation removal apparatus for fine or microwire according to the present invention.
  • Teflon TFE polytetrafluorethylene
  • Teflon F5? or fluorinated ethylenepropylene is also now used to coat electrical wires.
  • Teflon FEP polymer can be applied 'by extrusion techniques around the electrical conductor. Consequently, the Teflon FEP will possess the extended molecular chains of the high-temperature extrusion process held in place by normal temperature. At high temperature, these stresses are relieved and the coating shrinks by an elastic memory.
  • Teflon-TFE-type polymer With the Teflon-TFE-type polymer, a'different situation occurs.
  • the Teflon TFE must be applied by a dispersion process which does not leave the stresses of plastic memory. Consequently, it cannot be removed from microwires by the application of temperatures near the extrusion temperature.
  • Teflon is a particularly desirable insulation material. However, while its chemical inertness is desirable in use, it does eliminate the stripping function by chemical process. Further, Teflon is thermally one of the more resistant polymers. Experimentation has provided indication that the material does degrade almost completely at temperatures of approximately 500 C.
  • the drawing is a diagrammatic showing of the insulation removal apparatus comprising a supply of nitrogen gas 10 that is coupled to a filtering means 11.
  • the gas output from the filter 11 is coupled through a flow regulator 12 which functions to control the rate of nitrogen gas.
  • the gas flow from the regulator 12 passes through a serpentine heater that includes a tungsten-type heating element'l4.
  • a variac 15 functions to regulate the voltage applied to the heating element 14.
  • the serpentine'heater 13 includes a quartz tube which narrows down to a small diameter orifice at its lowermost portion.
  • the insulated microwire is positioned beneath the orifice in the quartz tube by threading through opposing glass or metal tubes 17.
  • the wire. 16 is fed from the feed spool 18 to the takeup spool 19. Lateral motion of the wire 16 is controlled by means of pressure pads 20 positioned between the tubes 17 and the feed spool 18, also between the tubes 17 and the takeup spool 19.
  • Electrical contacts are positioned immediately before the takeup spool 19 as a part of an electrically conductive path testing circuit which includes the buzzer 22 and the battery 23.
  • the test circuit is arranged so that the contacts 21 will activate the buzzer 22 if the circuit is completed via the portion of wire 16 which has the insulative coating removed from a predetermined portion.
  • the diagram shows a sliding platform 24 which slides as a mount for the wire support and spool apparatus.
  • the wire is moved under the stream of hot nitrogen gas emitted from the orifice in the quartz tube portion of the serpentine heater 13.
  • the temperature of the nitrogen gas stream is a function of the voltage at various controlled flow settings.
  • the effectiveness of the stripping operation is also a function of the distance between the wire 16 and the orifice opening in the quartz tube portion of the serpentine heater l3.
  • Teflon FEP it has been determined that for Teflon FEP, suitable stripping operations can be obtained when the temperature is in the range of 800 and 900 C. with this type of temperature control, a complete depolymerization of the polymer insulating coating can be achieved.
  • suitable and effective stripping operations can be controlled by the proper selection of parameters.
  • the system is devoid of knife edges to wear out, and damage the electrical conductor during the insulation stripping operation.
  • Apparatus for removing a preselected portion of insulation material from an electrical wire comprising:
  • a heater tube including an orifice for directing a stream of c. gas-conducting means coupling the supply of gas with the heater tube,
  • Apparatus for removing preselected portions of insulation material from an electrical wire comprising:
  • gas-conducting means including a gas flow regulator device
  • gas-heating means coupled with the gas-conducting means and including means for directing a steam of heated gas
  • Apparatus for removing a preselected portion of insulation material from an electrical wire comprising:
  • a gas flow regulator means coupled to the filtering means for regulating the flow of gas
  • a quartz tube including an orifice for directing a flow of gas and coupled to the gas flow regulator
  • the quartz tube being equipped with controllable heating means for heating the gas passing therethrough, and
  • f. means for passing an electrical wire that is insulated with polymer-type, material beneath the orifice in the quartz tube for the purpose of removing preselected portions of the insulation material by burning.
  • Apparatus for removing a preselected portion of insulation material from an electrical wire as defined in claim 4, further including a test circuit for checking the electrical continuity and determining if the insulation has been effectively removed from the preselected portion of the wire.
  • a process for removing the insulation material from a preselected portion of wire comprising the steps:

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  • Testing Relating To Insulation (AREA)
US35359A 1970-05-07 1970-05-07 Apparatus and process for the removal of insulation from wire Expired - Lifetime US3635454A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US3535970A 1970-05-07 1970-05-07

Publications (1)

Publication Number Publication Date
US3635454A true US3635454A (en) 1972-01-18

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US35359A Expired - Lifetime US3635454A (en) 1970-05-07 1970-05-07 Apparatus and process for the removal of insulation from wire

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US (1) US3635454A (en:Method)
FR (1) FR2088397B1 (en:Method)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3782889A (en) * 1971-09-09 1974-01-01 Xenon Corp Apparatus for rapid curing of resinous materials
JPS51108284A (en) * 1975-03-20 1976-09-25 Fujikura Ltd Purasuchitsukuhifukusenno hifukujokyohoho
US4769903A (en) * 1986-08-29 1988-09-13 Automated Systems & Devices, Inc. Cord filler remover and method
US4860441A (en) * 1987-08-07 1989-08-29 Automated Technology Systems, Inc. Electrical cord filler removal apparatus and method
WO1994014715A1 (en) * 1992-12-23 1994-07-07 Aeromover Systems Corporation Thermal jet glass cutter
DE4321006A1 (de) * 1993-06-24 1995-01-05 Kloeckner Moeller Gmbh Kabel, insbesondere für den Schaltschrank- und Steuerungsbau und Verfahren zu seiner Bearbeitung
WO1997039371A1 (en) * 1996-04-12 1997-10-23 Minnesota Mining And Manufacturing Company Process for preparation of optical fiber devices using optical fibers with thermally removable coatings
US20030062070A1 (en) * 2001-10-01 2003-04-03 Swain Robert F. Method and apparatus for removing polymeric coatings from optical fiber
US20030061837A1 (en) * 2001-10-01 2003-04-03 Swain Robert F. Method and apparatus for removing polymeric coatings from optical fiber in a non-oxidizing environment
US20050160552A1 (en) * 2003-06-02 2005-07-28 Takashi Yoshida Cleaning apparatus

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2207255B (en) * 1987-07-18 1991-03-20 Stc Plc Removing optical fibre encapsulation with a heated gas jet

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3351329A (en) * 1965-10-20 1967-11-07 Gen Electric Wire coating oven apparatus
US3367041A (en) * 1966-09-29 1968-02-06 Cluett Peabody & Co Inc Apparatus for abrasion resistance
US3402447A (en) * 1966-05-11 1968-09-24 Mettler Soehne Maschf Gas burner for singeing threads

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1835801A (en) * 1929-12-18 1931-12-08 Atwater Kent Mfg Co Method of and apparatus for forming leads
DE1289898B (de) * 1962-12-19 1969-02-27 Siemens Ag Verfahren und Vorrichtung zum Abisolieren isolierter elektrischer Leiterenden

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3351329A (en) * 1965-10-20 1967-11-07 Gen Electric Wire coating oven apparatus
US3402447A (en) * 1966-05-11 1968-09-24 Mettler Soehne Maschf Gas burner for singeing threads
US3367041A (en) * 1966-09-29 1968-02-06 Cluett Peabody & Co Inc Apparatus for abrasion resistance

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3782889A (en) * 1971-09-09 1974-01-01 Xenon Corp Apparatus for rapid curing of resinous materials
JPS51108284A (en) * 1975-03-20 1976-09-25 Fujikura Ltd Purasuchitsukuhifukusenno hifukujokyohoho
US4769903A (en) * 1986-08-29 1988-09-13 Automated Systems & Devices, Inc. Cord filler remover and method
US4860441A (en) * 1987-08-07 1989-08-29 Automated Technology Systems, Inc. Electrical cord filler removal apparatus and method
US5394505A (en) * 1992-12-23 1995-02-28 Aeromover Systems Corporation Thermal jet glass cutter
WO1994014715A1 (en) * 1992-12-23 1994-07-07 Aeromover Systems Corporation Thermal jet glass cutter
DE4321006A1 (de) * 1993-06-24 1995-01-05 Kloeckner Moeller Gmbh Kabel, insbesondere für den Schaltschrank- und Steuerungsbau und Verfahren zu seiner Bearbeitung
WO1997039371A1 (en) * 1996-04-12 1997-10-23 Minnesota Mining And Manufacturing Company Process for preparation of optical fiber devices using optical fibers with thermally removable coatings
US5939136A (en) * 1996-04-12 1999-08-17 Minnesota Mining And Manufacturing Company Process for preparation of optical fiber devices using optical fibers with thermally removable coatings
US20030062070A1 (en) * 2001-10-01 2003-04-03 Swain Robert F. Method and apparatus for removing polymeric coatings from optical fiber
US20030061837A1 (en) * 2001-10-01 2003-04-03 Swain Robert F. Method and apparatus for removing polymeric coatings from optical fiber in a non-oxidizing environment
US7003985B2 (en) 2001-10-01 2006-02-28 Swain Robert F Method and apparatus for removing polymeric coatings from optical fiber in a non-oxidizing environment
US20050160552A1 (en) * 2003-06-02 2005-07-28 Takashi Yoshida Cleaning apparatus
SG140459A1 (en) * 2003-06-02 2008-03-28 Fuji Elec Device Tech Co Ltd Cleaning apparatus

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Publication number Publication date
FR2088397A1 (en:Method) 1972-01-07
FR2088397B1 (en:Method) 1974-08-19

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