DE1917267A1 - Method and device for the production of multi-conductor cables - Google Patents

Description

British, insulated Callender's Cables Limited, 21 Bloomsbury Street, London W. C. 1, England

For this application, priority is derived from British patent application 1fr. 16462/68 of April 5, 1968 claimed.

Method and device for the production of multi-conductor cables

The invention relates to telecommunications cables of those Type in which these insulate a plurality of plastic Have ladders that are enclosed by a waterproof jacket. If these are laid in the ground or in channels Cables are damaged locally in such a way that water can enter the cable through the damaged sheath, then migrates ("creeps") the water into the spaces between each other insulated conductors or between the conductors and the jacket and thus exerts a "harmful influence on the electrical Properties of the ü-eijaüitkabel, where for example Short circuits occur via rftif holes in the wire insulation.

009838/1260

So that water that has already penetrated through a damaged area of the jacket or a connection housing does not exist either Wandering a short distance along the cable has been suggested to isolate the spaces between the Cable ladders and between them and the cable sheath over the entire length of the cable with water-impermeable filling material to be filled out.

There is a continuous barrier against penetration along the cable To build water, it is desirable to use a waterproof, impermeable material, which is not under the influence of gravity or hydrostatic pressure migrates in the event of damage to the cable jacket or the Connection housing can occur, which material, however, a relative sliding movement of the plastic-insulated conductors or groups of conductors allows the bending of the cable 'during manufacture or the relocation occurs. Examples of such materials are:

a) microcrystalline petroleum waxes,

b) Mixtures of microcrystalline petroleum waxes and oils, for example natural petroleum jelly,

c) low molecular weight, high melting point polyethylene or polypropylene of a semi-solid or fat-like type,

d) Mixtures of natural petroleum jelly> microcrystalline waxes, polyethylene, polyisobutylene and aluminum te ar at,

e) a mixture of two or more filling materials according to a) to d).

The choice of filler material is, to some extent, determined by the method of filling that filler material into the cable core and limited by the nature of the dielectric of the conductors forming the core.

In the manufacture of plastic-insulated, multi-core conductors that are completely filled with water-impermeable filler material

009838/1260

are filled out, it has been considered necessary to transport such material from a storage container to the To accomplish the cable and the introduction into the cable under positive pressure eu generated by a pump. However, it is difficult to pump such material in the solid state? '»Downright haggle inevitably cavitation occurs in the reservoir and so on there is an interruption in the Mach delivery after the pump. If it is also possible, under these favorable conditions to be pumped safely, e.g. through a line with a cross-section

2
of a nominal square or 6.5 em, with a required flow rate of e.g. 100 feet per minute or 30.7 m / min and a flow rate of 4 gallons per minute or 18.2 liters per minute, crystal bonds are destroyed in the material, whereby the material quality is deteriorated by lowering the viscosity, so that it is less suitable to form a barrier against pressurized water.

in the main application P 16 15 763.4 it has been determined that the deterioration of the material caused by the Purap process is reduced when the pumping process is at a temperature of the material takes place just above the temperature lies at which di-s crystallization begins, and the The main application includes a method for making a Cable core having a barrier made of sealing material, in which method the sealing material is somewhat thermostatic regulated storage container is pumped after a cable conveyor station at a temperature that is cerade above the temperature at which the crystallization begins and the process by which the material is transported from the cable conveyor station is cooled to the cable core for the purpose of crystallization. It has now been found that it is not necessary is to cool the sealing material during transport from the cable conveying station to the cable core, rather a

009838/1260

Core with a sufficient barrier of the sealing material can be made if the sealing material is at a Temperature is conveyed to the cable core, which is just above the temperature at which the crystallization begins, and that the cooling, to generate the crystallization by the discharge of heat takes place via the insulated conductors which constitute the core.

Accordingly, the present invention includes an improvement or further embodiment of that described in the parent application and claimed method and consists in a method of manufacturing a multi-core cable core which is a barrier comprising sealing material, in which method the sealing material from a thermostatically controlled storage container is pumped to a cable conveyor station at a temperature above the crystallization temperature, characterized in that the sealing material from the cable conveyor station to the cable core still has a temperature above the crystallization temperature lying temperature and the material is cooled for the purpose of crystallization by the heat above the insulated conductor forming the core is peeled off so that a sufficient amount of sealing material solidifies and one effective barrier to moisture migration along the core is formed.

The speed of conveyance of the sealing material to the cable core can be related to the linear pull-through speed of the core can be regulated, but the conveying speed of the sealing material is preferably such that for any Through speed of the cable core the cable core is supplied with sufficient material to provide an effective barrier form when the material solidifies.

Below a temperature just above that temperature

009838/1260

at which crystallization begins, a temperature is to be understood at which the sealing material is still in a sufficiently liquid state to allow the material to be pumped without deterioration of the material. If the sealing material is a mixture of microcrystalline petroleum waxes and oils, for example petroleum jelly, which mixtures are preferred, the temperature at which crystallization begins is about 70 ⁰ G and the temperature just above the temperature at which the Material that can be pumped without significant deterioration is approximately 76 ^° C

The invention also comprises an apparatus for carrying out the method and is characterized in that it comprises a thermostatically controlled storage tank for storing the having sealing material at a temperature just above the temperature at which the crystallization begins that the storage container is connected to one or more cable conveyor stations, which facilities for feeding the sealing material to the cable core, and that connected between the storage container and the application devices / applicator means / or stranding devices of the or each cable conveying station, devices for pulling off sealing material from the storage container and for controlling the conveying speed of the material to the feeder * are provided.

It is preferred to have a conveying station at each cable head or stranding head and sealing material at or to be provided shortly before the closing die of the cable head in which If the number of working conveyor stations is the same as the number around the center conductor (which also works as a pair or quadruples may be present) layers of

009838/1260

Ladders, conductor pairs or conductor quads However _, where the branch layer is laid around a group of two or more conductors, conductor pairs or conductor quads, it may be advantageous to provide a conveyor station at the point where two or more conductors, conductor pairs or Ladder quads are brought together to form a cable core. Another conveying station may be placed at the outlet end of the last closing mattress, but this has generally not been found to be necessary.

Preferably, the sealing material is supplied to the cable core via a Anlegematrise / applicator, the / or supplied Verseilmatriae, which is a separate part of the Schließmatriz® or forms which in the Sum m enhang with a strand or twisting / stranding head / stands and in this case the sealing material is applied to the surface of the last layer of conductors, conductor pairs or conductor quads formed, furthermore to the surface of each conductor of the layer of conductors, conductor pairs or conductor quads which are applied to the last layer formed by the closing die. and finally on the surface of the layers of conductors, conductor pairs or conductor quads- _? which are formed in the closing die, the result being that the interstices between the cables are completely filled with sealing material. Each Fördex'station can have its own source of supply and excess material (i.e. material that does not pass through the strand head) can be returned either in the liquid or semi-solid state to the storage container in order to bring it to the required temperature there or on the way to the storage container or the excess material can be collected by the feeder for reuse.

In an alternative embodiment, a common supply source for some or all of the conveyor stations can be a Machine or for some or all of the conveyor stations of a number of machines «

00 9838/1260

In such a case, the sealing material is kept at a temperature in a thermostatically controlled storage container which is just above the temperature at which crystallization begins and the material becomes over a circulation line circulates, which is thermally insulated and can be heated by means of heating coils to the circulating To keep material at the required temperature. Sealing material with such a material is required from this circulation line Subtracted temperature at points distant from one another and fed to the conveyor stations. Promoting the sealing Material to the cable core is preferably controlled by a valve at each conveying station, but it is too control by a measuring pump is possible. Excess material coming from the conveyor stations can in this case not be introduced into the circulation line before it has been brought to the temperature of the material being circulated. It is generally advantageous either to pump this material back into the common storage tank or to pump it back for one retry to collect. The sealing material is in the circulation line at a higher speed than the unit speed, in which it is withdrawn for the purpose of transmission to the cable core, promoted, for example, at a speed which is 5 to 10 times as large as the aggregate speed is. Such a circulation is preferably effected by means of a pump, the suction line of which is connected to one of the return line remote point of the reservoir is attached.

The invention will now be described in detail with reference to it, for example as shown in the drawing, showing:

1 shows a diagrammatic representation of a device for producing a multi-core cable core with a barrier made of sealing material, which

009838/1260

-8- 191726

extends along the entire length of the cable core, while the cable core is manufactured in a conventional stranding machine j

FIG. 2 shows a side view of a positioning die of the device according to FIG. 1;

FIG. 3 shows a section along the line HI-III in FIG

FIG. 4 shows a diagrammatic representation of a second embodiment of the device for producing a? continuous barrier made of sealing material in a multi-core & abelkem ·

As is evident bus Fig. 1, the apparatus © Ines. Torratskessel 1 for the sealing material and -ein Umlaufsa or a circulation line 2 on. The ATb & idxtsiaterial is thermostatically regulated as is known. The üalaiifisesiHslrolai? 2 is connected to the »lower part of the boiler 1 WQ '£ himä @ n waä w © lst © In Abführunger © in? 5 _S in which sla © I ³ uap® 5 aagsorfiaot ± st _p iiafi a Rüokführungleitung 4 on _o an ^ © fe- ^ sal of the distant vlwI along the Längo «iss? Ruekfiiig Terteilttn Stellsa ^ are eiagsfssioiijaet of which ποτ äsQi gen Kai3sli <jmo: "8tati02ieii 11, and it will sort from circulation collecting ring 2 Abdiolitisaterial" at eiasi TsüaperatuE · ;, DL® gsrads above 592 = SespG2 ature is ₅ at?? d ©]? dis Erist ginntj and äalier In eiaea liquidGa ^ ustaacl is, borrowed eatiioaMea nad su dsm Eabellrera g © fösä © rt _o JedG ICalbelford = station 11 has ice Yentil 12 zws StoueE'iaiig ä®r letgesehwiadig = »keit des to the system 2 removed AbdiciitaatsrialiB uafi eis © injection molding film 15 for the supply of the material i'a doa ICabslkarn «, The Spritsgufifons 15 is detachably attached to the Singaagseade for Söfelleßfora © ines Kabelkopfes or Vereilkopfes

009838/1260

The storage boiler 1 and all lines of the return line 2 are sheathed and the lines are provided with steam heating. In the lower part of the storage tank 1 are Steam heating windings 7 made of stainless steel, which are operated when the sealing material in the boiler is permitted has become fixed, for example, before the start of the circulation of the sealing material in preparation for feeding to the cable core. During the circulation of the sealing material and the supply to the cable core is the sealing material in the thermostatically controlled storage tank 1 by a suitable Method kept in the liquid state.

At each conveying station 11, sealing material, which is circulated in the return line 2 in the liquid state, is continuously removed and brought into the application matrix 15 / applicator in the liquid state. The speed of delivery of the sealing material in the liquid state to the cable core via the application matrix 15 is controlled by the associated valve 12. The sealing material is cooled for crystallization purposes by removing heat from the insulated conductors forming the core so that sufficient sealing material is converted into the solid state and thus an effective barrier is formed against the transmission of moisture along the core. The circulation speed of the sealing material in the return line 2 is generally 5 to 10 times as great as the aggregate speed, ie the discharge speed in the conveying stations 11.

Superfluous that oozes out of the contact matrices 15 Material is collected in respective collecting containers 16, the loss of heat through passage heating of the vessel can be compensated. "The Samnie vessels 16 will do that

009838/1260

Excess material in each case with a suction pump 18 through a filter 17 back into the. upper part of the storage vessel 1 pumped, from where, after it has been brought back to the temperature of the material being circulated, it is returned to the circuit of the Return line 2 can be introduced. A line 19 is provided at each conveyor station 11 to, if necessary, To guide sealing material directly from the circulation line 2 into the collecting container 16, for example on occasion dec start of the sealing work.

As shown in FIGS. 2 and 3, each of the Matrices 15 through which the sealing material is supplied in the liquid state to the cable core during its manufacture is, a body 21 which has a gradually tapered bore 22 which is bell-shaped at its insertion end is designed and which at its exit end corresponds to the cross section of the cable core passing through or slightly larger is. The outer surface of the wall of the body 21 is stepped along its length at three points and forms three cylindrical parts 23, 24 and 25. The part 23 at the outlet end the die is provided with an external thread, in part 24 the die wall three passages 26 are provided for the sealing material, which are evenly around the circumference of the die are distributed and are inclined to the axis of the die in such a way that the liquefied material is given a component of movement which lies in the same axial direction as the conveying direction of the cable core passing through the die. A sleeve 27 has the outer diameter of the cylindrical Part 25 corresponding inner diameter and at the other end an inwardly directed flange 28 with a G-winch is provided. The sleeve 27 is screwed onto the outer part 23 of the body 21 until it is on the cylindrical / Part 25 and sealing to the collar adjoining this

003038/1260

191726

is present. A bore 29 in the wall of the sleeve 27 is delimited by an upright Jiingwandung 31 ″ and offers the sealing material present in the liquid state access to a hanging chamber 30 »which is located between the inner surface of the sleeve 27 and the cylindrical 'feil lies. The annular wall 31 carries an internal screw connection for connection to a line, which sealing material from the Conveyor station 11 brings up. Sealing material present in the liquid state is transferred from the hanging canoe 30 to the cable core the passages 26 promoted. V / ie already mentioned is the Die 15 at the feed end of the sciilieomatdze of the stranding head releasably attached.

The FlieSgeschv-indigkeit of Abdieiitmateriöls in each die 15 is at least as high üaß ^{-sin: t} ¥ orrat "to Katerial the glockenförmi gen bath in the liquid state in the Hingkak-IÖR 30 and the Matrisse is held, it öiir ^ excess material is available, fecmx this fall into the Jewsi'ltgj isaiiL.iel ^ efäB 16, from v / o it wilier necked and suriick Ln u'SL ·. YorrataDe ^ wie oereitc "^ eschrleben _s ^ epusip"-; vfircU

Am vi'Slü-i ^ hjei? Cable core, \ -: elc-s -.- y ^ "iLC Aä'iu-.r-.are i ^

lla es werac: ä the lL · ¥ srblü ^ ai :; :. <i

~ ": S; ' * i6S 31- "" S3. L .- «. 'ΪίΞ

an ^ Givendei;., Das Ύ · \ =: 3ΐ1ϊΐο v / ird is iluss. ^ gs; i ^ Uü'cana bei eiiisr A'empsratur from u: i ^ - :. iäiir 76 "* 'G äs3 L ^ bell ~ G: ^. At jeaer aer SQGiis investor tribes :: - ίΐ a 3v sciuiliAx ^^ ei.- of un- .sränr 2 gallons per minute or 9 _a 1 liter / minute to ^ ts, ~ ie linear Uurchtx ^ ittsessch Speed des Kabelicernes amounts to about 2Z5 Fi ^ 'l-ünute or 69 e: per I-.iuute.

009838/1260

Although the above description relates to the continuous filling of a multi-core cable core during its manufacture refers, it is pointed out that the UmwäTzleitung can serve two or more neighboring cable manufacturing machines.

In a second embodiment shown in Fig. 4- Device according to the invention, each strand machine has at its inlet end a lay-on die 451 which the according to FIGS. 2 and 3 are the same and the sealing material for the cable core, which is present in the liquid state, is individually thermostatic regulated tank 41 is supplied. The sealing material is in the tank 41 by any suitable method in kept liquid state, e.g. by means of heating coils, 47. The sealing material present in the liquid state becomes the Anchor legs 45 over a conduit 42 which connects the cable conveying station represents, and filter 43 promoted by means of a measuring pump 44. Excess that emerges from the application matrices 45 Iiaterlal falls back into the tank 41, where it is again on; is heated and pumped back to the application matrix. Before the Anlegem-trize 45, a line 46 is provided so that in the Line 42 conveyed sealing material can be fed back directly into the tank 41 if necessary, for example before starting work.

Yes with the procedure in which the first embodiment of the device is used, sufficient sealing material is set by dissipating heat via the insulated conductors a v.'ii-KUij ^ svclle riperre against the forwarding of moisture formed along the cable core.

009838/1260

ORIGINAL

The procedure for fully pulling a multi-core cable in accordance with the present invention the advantage that essentially any mechanical Durehknetung the sealing material - generally petroleum jelly or Vaseline - is avoided so that the deposition of 01 from the wax is avoided. Such a separation occurs 'Otherwise under the action of shear forces when pumping such material were produced in the solid state.

The invention also relates to modifications of the embodiment outlined in the accompanying patent claim 1 and refers above all to all features of the invention, which are mentioned individually - or in combination - in the entire description and drawing.

Claims

009838/1260

SAO ORIGINAL

Claims (2)

DIPL-ING. ERICH SCHUBERT w * ». »Mn.» Talagram addr. Patidwb. Siafm 4L * KSIn 101 »JI, EiMn XIIi Lower k more often! Deuted » tank AO., AW .: Patent Attorney Diei.-I. *. SCHMHT, 9 »Sta« a> i, ΕΙμγμτ Strata 127 Filial · «Si * f * n υ ObtrhauMfl (MiM) 69 053 ZwA. April 2nd 1969 Patent claim (1.! Process for the production of a multi-core cable core, the eWe barrier made of sealing material, in which Process the sealing material from a thermostatically; itically regulated Reservoir is pumped to a cable conveyor station at a temperature just above the temperature nScnTätent r patent application P 16 15 763.4) in which die'Kristallisierung begins, characterized by the fact that the sealing material from the cable conveying station to the cable core is still conveyed at a temperature above the crystallization temperature and the material is cooled for the purpose of crystallization by the heat insulated over the core forming the core Ladders is stripped so that a sufficient amount of sealing material solidifies and an effective barrier to the migration of moisture along the core is formed. 2. The method according to claim 1, characterized in that the sealing material is continuously pumped out of the reservoir by keeping it at a temperature, which is just above the temperature at which the crystallization occurs begins, and that the sealing material at this temperature in a circulation line to one or more Cable conveyor stations is promoted, which are arranged along the circulation line. 3. The method according to claim 2, characterized in that in liquid or semi-dry form from the application matrix emerging excess material is returned to each cable conveyor station ium storage container and to the he 009838/1260 ~ 19172137 Required temperature in or on the way to the storage container is brought 4. The method according to claim 2 or 3 »characterized in that that the sealing material is pumped in the circulation line at a speed which is the speed of the aggregate of the material flow from the cable conveying stations to the cable core. 5. The method according to claim 4, characterized in that the sealing material in the recirculation line at a speed is pumped, which is five to ten times the aggregate speed.; - speed of the material flow from the cable conveying station to the cable core 6. The method according to claim 1, characterized in that the sealing material from a separate supply source to each cable requirement of a plurality of cable conveying stations is promoted. 7. The method according to claim 6, characterized in that excess sealing material, which in liquid or semi-liquid state emerges from a lay-on die at each cable station to which that storage container is returned, which is assigned to the latrize, and that this excess sealing material is brought to the required temperature in the boiler. 8. The method according to any one of claims 2 to 7, characterized in, that the sealing material of the core in the closing mold or at a short distance in front of this of each Litsenkopfes a stranding machine is fed, which is used for Production of the cable core is used in a manner known per se. 9. The method according to claim 8, in which the first conductor layer, Pairs or bundles of four of the cable core is disarmed by a group of two or more conductors, with two or more conductors Bundle of four the iuitte ^ dBa JCegnes J} ikien, characterized that the sealing material is at a temperature which is just is above the temperature at which the crystallization begins, is delivered through a lay-on matrix to the point, where the two conductors, conductor pairs or conductor quads are joined together to form the center of the core. 10. Device for the production of a multi-core cable core, which has a barrier made of sealing material, for implementation of the method according to claim 1, characterized in that the device comprises a thermostatically controlled storage container (1, 41) to store the sealing. Materials at one temperature to v / eist, which is just above the temperature at which crystallization begins, that the storage container (1, 41) is connected to one or more cable conveyor stations (11, 42), which devices (15, 45) for feeding the have sealing material to the l ^ abelkern, and that connected between the storage container and the application devices of the or each cable conveyor station, devices for pulling off of sealing laaterial from the storage container and for controlling the conveying speed of the material to the feeders are provided. 11 ο device according to claim 10, for performing the Method according to one of Claims 2 to 5, characterized in that the thermostatically controlled storage container (1) is connected to a circulation line (2) of the sealing material, in which circulation line a device (5) for continuous Removal of sealing material from the storage container in order to convey this material into the circulation line and back to the storage container and a cable conveyor station (11) are provided, namely at one or more points distributed along the circulation line. 12. Apparatus according to claim 10 or 11, characterized in that the or each device (12) for control the speed of conveyance of the material to the mooring devices is a valve. 009838/1260 BAD Ö & IGINAL 13. The apparatus according to claim 11 or 12, characterized in that a heated tank (16) is connected to each feed device (15) for the purpose of collecting excess material which emerges from the feed devices that a line from the collecting tank to the storage container ( 1) and that a suction pump (18) is provided for conveying the excess material from the collecting tank back into the storage container _e 14 «Device according to claim 10, for performing the Method according to claims 6 or 7, characterized in that that a plurality of thermostatically controlled storage containers (41) are connected to a separate cable conveyor station (4-2) are. 15o device according to claim 14, characterized in that that each means (44) for stripping off sealing material from the storage tank and to control the conveying speed to the application devices (45) is a metering pump. I6e device according to claim 14 or 15, characterized in that indicates that each storage container is so arranged in relation to the feeding devices of the associated cable conveyor station is that excess material and material escaping from the feeder devices is collected. 17. Device according to one of claims 10 to 16, characterized in that the or each application device (14, 45) comprises a die which is a separate part of a closing form of a stranded head of a stranding machine or educates. 18. The device according to claim 17 »characterized in that that the application die has a gradually tapering bore (22) which at its exit end corresponds to the cross section one through her. cable core passing through, corresponds to or slightly exceeds this diameter, and that "the wall of the bore has a number of passage openings 009838/1260 (26) for the entry of sealing material. 19 «Device according to claim 17, characterized in that that the openings of the application die between the bore and an annular chamber (30) extend through a Part of the outer surface of the die wall and an outer sleeve (28) which is screwed onto the die and in its wall a bore (29) for the entry of sealing material J.n the Rin; -; chamber. 20. Device according to claims 18 or 19, characterized in that that the passages of the lay-on die are evenly distributed around the circumference of the die and so inclined to the axis of this die are that the sealing material entering the die has a component of movement in the same axial direction which corresponds to the direction of pull of the cable core. 21. Device according to one of claims 10 to 20, characterized in that the or each storage container is jacketed and contains heating coils. 609838/1280 Blank page