GB2227689A - Treatment of plastics insulated wire - Google Patents

Treatment of plastics insulated wire Download PDF

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Publication number
GB2227689A
GB2227689A GB8927836A GB8927836A GB2227689A GB 2227689 A GB2227689 A GB 2227689A GB 8927836 A GB8927836 A GB 8927836A GB 8927836 A GB8927836 A GB 8927836A GB 2227689 A GB2227689 A GB 2227689A
Authority
GB
United Kingdom
Prior art keywords
plastics
wire
coating
cross
receiver
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.)
Withdrawn
Application number
GB8927836A
Other versions
GB8927836D0 (en
Inventor
Richard John Murphy
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.)
VACTITE Ltd
Original Assignee
VACTITE 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 VACTITE Ltd filed Critical VACTITE Ltd
Publication of GB8927836D0 publication Critical patent/GB8927836D0/en
Publication of GB2227689A publication Critical patent/GB2227689A/en
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
    • G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
    • G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/06—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation
    • B05D3/068—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation using ionising radiations (gamma, X, electrons)
    • 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
    • H01B13/003—Apparatus or processes specially adapted for manufacturing conductors or cables using irradiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2256/00—Wires or fibres

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Toxicology (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Manufacturing & Machinery (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)

Abstract

Plastics-coated wire is passed through a beam of X-radiation which simultaneously cross-links the plastics material and produces in an X-ray receiver an image of the internal structure of the plastics coating, for the purpose of quality control.

Description

Treatment of Plastics Insulated Wire This invention relates to a method and apparatus for the production of wire with a plastics insulation coating, and is particularly useful in the manufacture of electric wire with a cross-linked polymeric insulator.
The invention provides a method of manufacture of plastics-coated wire, comprising coating the wire with un-cross-linked plastics material, irradiating the coated wire with X-radiation to cross-link the plastics coating, and simultaneously producing an image of the internal structure of the coating using the same X-radiation. This provides a simple means of exerting quality control on the production process. Where the wire is coated by an extrusion process, for example, the process parameters can be adjusted in response to the observed quality of the coating.
The irradiation and imaging steps are preferably achieved by passing the wire continuously between an X-ray generator and an X-ray imaging receiver.
According to a further aspect, the invention provides apparatus for manufacturing and quality-testing plastics-coated wire, comprising an X-ray generator and an X-ray imaging receiver and means for passing the un-cross-linked plastics-coated wire between X-ray generator and receiver whereby to cross-link the plastics coating and to image the internal structure of the plastics coating using the same X-radiation. The apparatus preferably further comprises extrusion apparatus for coating the wire with the un-cross-linked plastics material. Conveniently, the apparatus comprises means for displaying the image from the imaging receiver.
The image may be produced simultaneously, or may be stored for subsequent reproduction.
The invention is particularly useful in the production of electric wire with a plastics insulation coating, but is applicable to any filament or stranded cable, for example, with a plastics coating which requires cross-linking.
One way of performing the invention will now be described, by way of example only, with reference to the accompanying schematic drawing, which is a diagram of the apparatus used to manufacture plastics-coated wire in accordance with the invention.
The apparatus comprises a conventional extruder from which un-cross-linked plastics-coated wire is drawn continuously. At a subsequent station, the coated wire passes at a predetermined distance from X-ray generator which irradiates the wire in a perpendicular direction. The X-ray generator has a frequency control in order to tune the X-radiation to the particular polymer system used as the coating material.
The X-radiation causes the plastics coating to be cross-linked, partially or totally in accordance with the particular requirements of the insulating coating.
The internal structure of the plastics coating is imaged simultaneously using the same X-radiation transmitted through the wire, by means of an X-ray receiver positioned on the opposite side of the wire. The image produced by the receiver is displayed by means of a video display unit (VDU), either simultaneously or after storage in a storage medium (not shown). Faults in the internal structure, such as the presence of internal bubbles or specks of impurities, are apparent from the image, and are monitored in order to determine whether any changes need to be made to the operating parameters of the extrusion and/or the cross-linking process.
Although in this example only one generator and one receiver is shown, it will appreciated that superior results may be obtained with the use of multiple pairs of generators and receivers, using beams of X-radiation passing through the wire in the transverse plane at different angles.
The radiographic examination for voids in this manner is achieved best with the use of very high resolution X-ray equipment, employing a very small focal spot centered on the axis of the wire.
X-ray generators using tungsten targets are favoured.

Claims (8)

1. A method of manufacture of plastics-coated wire, comprising coating the wire with un-cross-linked plastics material, irradiating the coated wire with X-radiation to cross-link the plastics coating, and simultaneously producing an image of the internal structure of the coating using the same X-radiation.
2. A method according to Claim 1, in which the irradiation and imaging steps are achieved by passing the wire continuously between an X-ray generator and an X-ray receiver.
3. A method according to Claim 1 or 2, in which the wire is coated by means of an extrusion process.
4. Apparatus for manufacturing and quality-testing plastics-coated wire, comprising an X-ray generator and an X-ray imaging receiver, and means for passing the un-cross-linked plastics-coated wire between the X-ray generator and receiver whereby to cross-link the plastics coating and to image the internal structure of the plastics coating using the same X-radiation.
5. Apparatus according to Claim 4, comprising extrusion apparatus for coating the wire with the un-cross-linked plastics material.
6. Apparatus according to Claim 4 or 5, comprising means for displaying the image from the receiver.
7. A method of manufacture of plastics-coated wire, substantially as described herein with reference to the accompanying drawing.
8. Apparatus for manufacturing and quality-testing plastics-coated wire, substantially as described herein with reference to the accompanying drawing.
GB8927836A 1989-01-06 1989-12-08 Treatment of plastics insulated wire Withdrawn GB2227689A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB898900254A GB8900254D0 (en) 1989-01-06 1989-01-06 Treatment of plastics insulated wire

Publications (2)

Publication Number Publication Date
GB8927836D0 GB8927836D0 (en) 1990-02-14
GB2227689A true GB2227689A (en) 1990-08-08

Family

ID=10649674

Family Applications (2)

Application Number Title Priority Date Filing Date
GB898900254A Pending GB8900254D0 (en) 1989-01-06 1989-01-06 Treatment of plastics insulated wire
GB8927836A Withdrawn GB2227689A (en) 1989-01-06 1989-12-08 Treatment of plastics insulated wire

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB898900254A Pending GB8900254D0 (en) 1989-01-06 1989-01-06 Treatment of plastics insulated wire

Country Status (1)

Country Link
GB (2) GB8900254D0 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997032200A1 (en) * 1996-02-29 1997-09-04 Borealis A/S Process for monitoring a disperse system for non-dispersed impurities and device for carrying out said process

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997032200A1 (en) * 1996-02-29 1997-09-04 Borealis A/S Process for monitoring a disperse system for non-dispersed impurities and device for carrying out said process

Also Published As

Publication number Publication date
GB8927836D0 (en) 1990-02-14
GB8900254D0 (en) 1989-03-08

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)