GB1339461A - Cables - Google Patents

Cables

Info

Publication number
GB1339461A
GB1339461A GB4438871A GB1339461DA GB1339461A GB 1339461 A GB1339461 A GB 1339461A GB 4438871 A GB4438871 A GB 4438871A GB 1339461D A GB1339461D A GB 1339461DA GB 1339461 A GB1339461 A GB 1339461A
Authority
GB
United Kingdom
Prior art keywords
plastics
die
conductor
cavitation
insulation
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
Application number
GB4438871A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB1339461A publication Critical patent/GB1339461A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/20—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of indefinite length
    • B29C44/32—Incorporating or moulding on preformed parts, e.g. linings, inserts or reinforcements
    • B29C44/322—Incorporating or moulding on preformed parts, e.g. linings, inserts or reinforcements the preformed parts being elongated inserts, e.g. cables
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/14—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the particular extruding conditions, e.g. in a modified atmosphere or by using vibration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/05—Filamentary, e.g. strands

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

1339461 Cellular plastics made by ultrasonic vibration STANDARD TELEPHONES & CABLES Ltd 23 Sept 1971 44388/71 Heading C3C [Also in Divisions B4-B5 and H1] An electrical conductor wire 1 is sheathed with cellular plastics insulation by passage through an extrusion die 4 from which the molten plastics is delivered as the conductor is ultrasonically vibrated to produce cavitation of the plastics which is prevented from collapse by cooling of the plastics. The conductor 1 passes through the die 4 between vibration dampers 7, 8 e.g. each consisting of a pair of diametrically opposed and spring loaded pulleys, and the vibrations are preferably applied between the upstream damper 7 and the die 4 by a device 9 e.g. a radio frequency generator 10, transducer 11, and velocity transformer 12. The frequency and intensity of the vibration may be varied to produce the cavitation within, or downstream of the die 4, and the cavitation may extend throughout the cross-section of the applied insulation or be restricted to the immediate vicinity of the conductor. The insulation may comprise polyethylene, polypropylene, polyvinyl chloride; or polystyrene.
GB4438871A 1971-09-23 1971-09-23 Cables Expired GB1339461A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4438871 1971-09-23

Publications (1)

Publication Number Publication Date
GB1339461A true GB1339461A (en) 1973-12-05

Family

ID=10433058

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4438871A Expired GB1339461A (en) 1971-09-23 1971-09-23 Cables

Country Status (2)

Country Link
AU (1) AU4603572A (en)
GB (1) GB1339461A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2341341A (en) * 1998-09-02 2000-03-15 Px Technologies Ltd Improvements in or relating to moulding

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2341341A (en) * 1998-09-02 2000-03-15 Px Technologies Ltd Improvements in or relating to moulding

Also Published As

Publication number Publication date
AU4603572A (en) 1974-03-07

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
435 Patent endorsed 'licences of right' on the date specified (sect. 35/1949)
PCNP Patent ceased through non-payment of renewal fee