GB1292227A - Process and apparatus for covering continous elongate core material with cross-linked synthetic thermoplastics - Google Patents

Process and apparatus for covering continous elongate core material with cross-linked synthetic thermoplastics

Info

Publication number
GB1292227A
GB1292227A GB03286/70A GB1328670A GB1292227A GB 1292227 A GB1292227 A GB 1292227A GB 03286/70 A GB03286/70 A GB 03286/70A GB 1328670 A GB1328670 A GB 1328670A GB 1292227 A GB1292227 A GB 1292227A
Authority
GB
United Kingdom
Prior art keywords
cross
die
passage
extrusion
linking
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
GB03286/70A
Inventor
Franz Heitzmann
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.)
SUDDEUTSCHE KABELWERKE ZWEIGNI
Original Assignee
SUDDEUTSCHE KABELWERKE ZWEIGNI
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 SUDDEUTSCHE KABELWERKE ZWEIGNI filed Critical SUDDEUTSCHE KABELWERKE ZWEIGNI
Publication of GB1292227A publication Critical patent/GB1292227A/en
Expired legal-status Critical Current

Links

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
    • H01B13/14—Insulating conductors or cables by extrusion
    • 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
    • B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
    • 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
    • B29C48/06—Rod-shaped
    • 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
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
    • B29C48/34—Cross-head annular extrusion nozzles, i.e. for simultaneously receiving moulding material and the preform to be coated
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2101/00—Use of unspecified macromolecular compounds as moulding material
    • B29K2101/10—Thermosetting resins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2301/00—Use of unspecified macromolecular compounds as reinforcement
    • B29K2301/10—Thermosetting resins

Abstract

1292227 Extrusion coating electrical conductors SUDDEUTSCHE KABELWERKE ZWEIGNIEDERLASSUNG DER VEREINIGTE DEUTSCHE METALLWERKE AG 19 March 1970 [28 March 1969] 13286/70 Heading B5A [Also in Division H1] An electrical conductor 31, e.g. stranded aluminium of round section, is covered with an insulating layer of cross-linked polyethylene by passage through a heated extrusion crosshead to which polyethylene 34 containing crosslinking agent, e.g. 0À8 part by weight dicumyl peroxide, is delivered through one or more ducts from one or more chambers 10 in which the cross-linking has been initiated by heating under high pressure, e.g. 10,000 atmospheres, the cross-linking being completed during passage through the elongated transversely adjustable and heated die 20<SP>1</SP> of the head, e.g. heated to 260‹ to 290‹ C. and of 250 mm. length, respectively, for conductors of 95 and 150 sq. mm. cross-section, respectively, coated with 1À3 mm. and 7À5 mm. polyethylene. It is stated that the high extrusion pressure eliminates the need to draw the conductor 31 through the die head, from the die whereof the covering is cooled by passage through an unpressurized cooling device and coiled under zero tension. In the Fig. 2 embodiment (not printed) the insulating layer is applied directly to the conductor, but in the Fig. 3 embodiment the insulating layer is applied over a cross-linkable semi-conducting smoothing layer 33, e.g. of ethylene polymer filled with carbon black, which is applied to the conductor 31 in the same head and simultaneously cross-linked during passage through the die 20<SP>1</SP>. In the Fig. 4 embodiment (not printed) the semi-conducting and insulating layers are applied by passage through consecutive heads, in either the former or the latter whereof the cross-linking of the semi-conducting layer is completed. The extrusion surfaces of the head are covered with an adhesion preventing covering. The pressure effect of the elongated die 201 may be enhanced by the passage thereof tapering towards the outlet. The cross-linking prior to extrusion from the die and the high pressure therein prevents the formation of voids or bubbles in the insulation.
GB03286/70A 1969-03-28 1970-03-19 Process and apparatus for covering continous elongate core material with cross-linked synthetic thermoplastics Expired GB1292227A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691915892 DE1915892A1 (en) 1969-03-28 1969-03-28 Method and device for wrapping strand-like goods with crosslinked thermoplastics

Publications (1)

Publication Number Publication Date
GB1292227A true GB1292227A (en) 1972-10-11

Family

ID=5729587

Family Applications (1)

Application Number Title Priority Date Filing Date
GB03286/70A Expired GB1292227A (en) 1969-03-28 1970-03-19 Process and apparatus for covering continous elongate core material with cross-linked synthetic thermoplastics

Country Status (4)

Country Link
CH (1) CH534577A (en)
DE (1) DE1915892A1 (en)
FR (1) FR2040974A5 (en)
GB (1) GB1292227A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0033587B1 (en) * 1980-01-18 1983-05-11 Wirsbo Bruks Aktiebolag Preparation of shaped crosslinked materials
CN114388192A (en) * 2020-10-22 2022-04-22 昆明电缆集团昆电工电缆有限公司 High-quality medium-voltage crosslinked cable insulation core and preparation method thereof

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2852001A1 (en) * 1978-12-01 1980-06-12 Metallgesellschaft Ag METHOD FOR SHEATHING ROTATION-SYMMETRICAL, METALLIC MOLDED BODIES

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0033587B1 (en) * 1980-01-18 1983-05-11 Wirsbo Bruks Aktiebolag Preparation of shaped crosslinked materials
CN114388192A (en) * 2020-10-22 2022-04-22 昆明电缆集团昆电工电缆有限公司 High-quality medium-voltage crosslinked cable insulation core and preparation method thereof
CN114388192B (en) * 2020-10-22 2023-12-15 昆明电缆集团昆电工电缆有限公司 High-quality medium-voltage crosslinked cable insulation wire core and preparation method thereof

Also Published As

Publication number Publication date
FR2040974A5 (en) 1971-01-22
CH534577A (en) 1973-03-15
DE1915892A1 (en) 1970-10-15

Similar Documents

Publication Publication Date Title
US3569610A (en) Ethylene-propylene rubber insulated cable with cross-linked polyethylene strand shielding
US3944459A (en) Method and apparatus for applying reinforced insulation to a conductor
KR930002947B1 (en) Strippable laminate
GB1408947A (en) Production of electrical conductors covered with crosslinked material
US3479446A (en) Strand shielded cable and method of making
GB1407433A (en) Method of manufacturing articles
US3229012A (en) Method and apparatus for extruding laminar wall
GB1228820A (en)
GB1502456A (en) Stranded electrical cable
US3849192A (en) Method of applying and cooling low density polyethylene cable insulation
US4091064A (en) Process for producing electric cable insulated with cured polyolefin
GB1292227A (en) Process and apparatus for covering continous elongate core material with cross-linked synthetic thermoplastics
GB1434775A (en) Insulating wires and cables with highly expanded polyolefin
US3942937A (en) Method of providing durable, slick sliding surfaces on extrusion forming apparatus, and the product thereof
US3406248A (en) Cable with extruded covering having fibrous interlayer
US3632720A (en) Method of fabricating cables
GB1237173A (en) Electric cables insulated with rubber or synthetic material and a process for their manufacture
GB1421109A (en) Process fro producting electric cable insulated with cured polymeric material
US3761332A (en) Watertight disc coaxial cable
GB1387933A (en) Polyethylene covered conductors
US3446883A (en) Method and apparatus for producing conductors surrounded by three or more extruded layers
GB1064622A (en) Improvements in or relating to electric cables
US2863171A (en) Apparatus for coating stranded conductors for electric cables
US1770969A (en) Method of and apparatus for sheathing cores
GB349105A (en) Improvements in or relating to submarine electric signalling cables

Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLNP Patent lapsed through nonpayment of renewal fees