US1992678A - Manufacture of flexible tubes of artificial substances - Google Patents

Manufacture of flexible tubes of artificial substances Download PDF

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Publication number
US1992678A
US1992678A US738140A US73814034A US1992678A US 1992678 A US1992678 A US 1992678A US 738140 A US738140 A US 738140A US 73814034 A US73814034 A US 73814034A US 1992678 A US1992678 A US 1992678A
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United States
Prior art keywords
conductors
manufacture
flexible tubes
mouthpiece
artificial substances
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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 - Lifetime
Application number
US738140A
Inventor
Studt Ernst
Meyer Ulfilas
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.)
Norddeutsche Seekabelwerke GmbH
Original Assignee
Norddeutsche Seekabelwerke GmbH
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 US693213A external-priority patent/US2074285A/en
Application filed by Norddeutsche Seekabelwerke GmbH filed Critical Norddeutsche Seekabelwerke GmbH
Priority to US738140A priority Critical patent/US1992678A/en
Application granted granted Critical
Publication of US1992678A publication Critical patent/US1992678A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels

Definitions

  • Polystyrol itself and substances similar to it are generally hard and brittle and, therefore, it is not possible to produce from such substances, by ordinary extrusion, insulating coverings which will withstand the bending stresses to which an electric cable is exposed.
  • it is possible to produce a sufllciently flexible tubular covering by exerting a pull on the tube of insulating material which is pressed out of the mouthpiece. The force of this pull mustbe so great that the speed of the tube which is drawn out is greater than the outlet speed of the heated mass leaving the extrusion mouthpiece.
  • the copper wire 1) runs from the reel a through the member 0 of a pressing device d, over a drawing-off disc e to the reel f.
  • the polystyrol g which is placed in the pressing device (1 and passes through the mouthpiece h places itself around the conductor 1) at i.
  • the speed of the drawing-oil disc e is adjusted, by means of the motor is and a change-speed gear m, in such a manner that the tube of polystyrol coming out of the mouthpiece h is subjected both to stretching and to a reduction in the diameter, being thereby drawn over the conductor at i.
  • a cooling device n may be provided between the mouthpiece h and the drawing-oil disc e.
  • the method according to the invention is of special importance for the manufacture of air space insulated conductors for signalling cables.
  • the insulation of the air space insulated conductors according to the invention shows substantially better electric values.
  • the average dielectric constant is 1.3-4.4 and the tangent of the angle of loss 0.2.1() (as compared with 1.6 and 3.10- in the case. of paper and air space insulated conductors).
  • a further method for this purpose consists in covering all or a portion of the group of conductors, each with a tubular covering of polystyrol, preferably without using an intermediate layer which would prevent the adhesion.
  • a method of manufacturing flexible tubes or hoses of polystyrol and other polymerization products of aryl olefines which tube or hose forms the covering of a metallic conductor, consisting in drawing the said material heated at a high temperature through a mouthpiece of annular shape under pressure in such a manner that the drawing speed is greater than the outlet speed of the mouthpiece, the metallic conductor being passed through a bore provided in the central part of the mouthpiece.
  • a method of manufacturing air space insulated conductors consisting in first providing a metallic conductor with a cord or thread winding of polystyrol or like insulating substance, and then covering it with a tube or hose manufactured by the method claimed in claim 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Insulated Conductors (AREA)

Description

Feb. 26, 1935. E, STUDT HA 1,992,678
MANUFACTURE OF FLEXIBLE TUBES OF ARTIFICIAL SUBSTANCES Original Filed Oct. 11, 19355 5 ADAM/(L Patented Feb. 26, 1935 UNITED STATES PATENT OFFICE MANUFACTURE OF FLEXIBLE TUBES OF ARTIFICIAL SUBSTANCES Ernst Studt, Nordenllam, and Uliilas Meyer,
Cologne-Mulbeim,
Germany, deutschen Seekabelwerke A.
(Oldenburg), Germany assignors to Nord- G., Nordenham Original application October 11, 1933, Serial No.
vember 21, 1932 Claims.
5 application, Serial No. 693,213, filed 11th October,
Polystyrol itself and substances similar to it are generally hard and brittle and, therefore, it is not possible to produce from such substances, by ordinary extrusion, insulating coverings which will withstand the bending stresses to which an electric cable is exposed. According to the invention, it is possible to produce a sufllciently flexible tubular covering by exerting a pull on the tube of insulating material which is pressed out of the mouthpiece. The force of this pull mustbe so great that the speed of the tube which is drawn out is greater than the outlet speed of the heated mass leaving the extrusion mouthpiece.
The accompanying drawing illustrates, by way of example, in plan view, partly in section, a general arrangement for carrying the method according to the invention into effect.
The copper wire 1) runs from the reel a through the member 0 of a pressing device d, over a drawing-off disc e to the reel f. The polystyrol g which is placed in the pressing device (1 and passes through the mouthpiece h places itself around the conductor 1) at i. The speed of the drawing-oil disc e is adjusted, by means of the motor is and a change-speed gear m, in such a manner that the tube of polystyrol coming out of the mouthpiece h is subjected both to stretching and to a reduction in the diameter, being thereby drawn over the conductor at i. A cooling device n may be provided between the mouthpiece h and the drawing-oil disc e. By using a number of presses one behind the other, or by suitably constructing the mouthpiece, the conductor may be surrounded with a number of coverings in one operation.
It is an advantage to provide thin layers of fat or the like between the copper conductor and the first insulating layer, as well as between the individual insulating layers, which layers of fat prevent the individual coverings from firmly adhering to one another and to the metal. Besides fat, use may be made of any other material having a high dielectric value, which would prevent the adhesion and which does not attack either the insulating material or the metal.
The method according to the invention is of special importance for the manufacture of air space insulated conductors for signalling cables. By means of the device described with reference Divided and this application August 2, 1934, Serial No. 738,140.
In Germany Noto the drawing, it is possible to manufacture air space insulated conductors in a single operation by providing between the reel a and the member 0 a known device for the formation of a thread or cord winding. It is, however, also possible to provide the thread or cord winding beforehand in a separate operation. The thread may also consist of polystyrol; however, it may be made of any other suitable insulating material, for instance paper. The copper conductor thus wound with a thread and prepared beforehand in the manner just referred to is then covered with a tubular covering of polystyrol, immediately behind the pressing device.
As compared with the known conductors provided with paper and air space insulation, the insulation of the air space insulated conductors according to the invention shows substantially better electric values. The average dielectric constant is 1.3-4.4 and the tangent of the angle of loss 0.2.1() (as compared with 1.6 and 3.10- in the case. of paper and air space insulated conductors).
If it is desired to strand together a number of air space insulated conductors according to the invention, it is an advantage first of all to heat the conductors to about 50-70. After the cooling, the conductors retain exactly the position which they have assumed in the heated state. The capacity values of such a group of conductors remain to a very large extent constant, also under unfavourable conditions, for instance during the laying of submarine cables.
In order to fix the position of the individual conductors relatively to one another and thereby also the capacities of the telephone circuits, a further method for this purpose consists in covering all or a portion of the group of conductors, each with a tubular covering of polystyrol, preferably without using an intermediate layer which would prevent the adhesion.
What we claim is:
1. A method of manufacturing flexible tubes or hoses of polystyrol and other polymerization products of aryl olefines, which tube or hose forms the covering of a metallic conductor, consisting in drawing the said material heated at a high temperature through a mouthpiece of annular shape under pressure in such a manner that the drawing speed is greater than the outlet speed of the mouthpiece, the metallic conductor being passed through a bore provided in the central part of the mouthpiece.
2. A method of providing a metallic conductor with any desired number of flexible tubes or hoses manufactured as claimed in claim 1, comprising the step that layers of fat or of other substances capable of preventing sticking are provided between the metallic conductor and the first flexible tube and between the flexible tubes.
3. A method of manufacturing air space insulated conductors consisting in first providing a metallic conductor with a cord or thread winding of polystyrol or like insulating substance, and then covering it with a tube or hose manufactured by the method claimed in claim 1.
4. A method of manufacturing groups of conductors from individual conductors covered by a flexible tube manufactured according to the method claimed in claim 1, comprising the step that before the conductors are stranded into groups they are heated to about 50-70 C,
5. A method of manufacturing groups of conductors from individual conductors covered by a flexible tube manufactured according to the method claimed in claim 1, comprising the step that before the conductors are stranded into groups they are heated to about 50'I0 C., and
the further step that a similar flexible tube is pro- 10 vided on the group of conductors.
ERNST STUDT. ULFILAS MEYER.
US738140A 1933-10-11 1934-08-02 Manufacture of flexible tubes of artificial substances Expired - Lifetime US1992678A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US738140A US1992678A (en) 1933-10-11 1934-08-02 Manufacture of flexible tubes of artificial substances

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US693213A US2074285A (en) 1932-10-24 1933-10-11 Manufacture of flexible bands, threads, foils, and tubes of artificial substances
US738140A US1992678A (en) 1933-10-11 1934-08-02 Manufacture of flexible tubes of artificial substances

Publications (1)

Publication Number Publication Date
US1992678A true US1992678A (en) 1935-02-26

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2467642A (en) * 1945-04-12 1949-04-19 Moore & Co Samuel Method for coating articles with plastic material
US2471752A (en) * 1945-12-22 1949-05-31 Whitney Blake Co Process of covering wire conductors
US2523313A (en) * 1941-07-08 1950-09-26 Int Standard Electric Corp Joint and termination for electric power cables
US2608722A (en) * 1950-09-06 1952-09-02 Otmar M Stuetzer Process for making microspacers
US2669754A (en) * 1947-11-26 1954-02-23 Danielson Mfg Company Manufacture of composite wire and rope
US2739212A (en) * 1953-08-11 1956-03-20 Gates Rubber Co High range strain gage
DE972059C (en) * 1952-06-04 1959-05-14 Osnabruecker Kupfer Und Drahtw Corrugated pipes, armored lines and cables as well as cables with corrugated sheaths and processes for the production of protective covers therefor
US2896250A (en) * 1954-12-01 1959-07-28 Burnie J Craig Apparatus for making ball point pens
US2993236A (en) * 1956-09-07 1961-07-25 Ici Ltd Method of producing cord-like product
US3015133A (en) * 1959-02-05 1962-01-02 Anaconda American Brass Co Method of making jacketed strip-wound metal hose
DE975586C (en) * 1943-01-29 1962-02-01 Hackethal Draht Und Kabel Werk Process for the production of electrical conductors with flexible insulation made of thermoplastic plastics

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2523313A (en) * 1941-07-08 1950-09-26 Int Standard Electric Corp Joint and termination for electric power cables
DE975586C (en) * 1943-01-29 1962-02-01 Hackethal Draht Und Kabel Werk Process for the production of electrical conductors with flexible insulation made of thermoplastic plastics
US2467642A (en) * 1945-04-12 1949-04-19 Moore & Co Samuel Method for coating articles with plastic material
US2471752A (en) * 1945-12-22 1949-05-31 Whitney Blake Co Process of covering wire conductors
US2669754A (en) * 1947-11-26 1954-02-23 Danielson Mfg Company Manufacture of composite wire and rope
US2608722A (en) * 1950-09-06 1952-09-02 Otmar M Stuetzer Process for making microspacers
DE972059C (en) * 1952-06-04 1959-05-14 Osnabruecker Kupfer Und Drahtw Corrugated pipes, armored lines and cables as well as cables with corrugated sheaths and processes for the production of protective covers therefor
US2739212A (en) * 1953-08-11 1956-03-20 Gates Rubber Co High range strain gage
US2896250A (en) * 1954-12-01 1959-07-28 Burnie J Craig Apparatus for making ball point pens
US2993236A (en) * 1956-09-07 1961-07-25 Ici Ltd Method of producing cord-like product
US3015133A (en) * 1959-02-05 1962-01-02 Anaconda American Brass Co Method of making jacketed strip-wound metal hose

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