CN1192568A - Conductive fiber core flexible cable and process for producing same - Google Patents

Abstract

A kind of conducting fiber core soft cable is made as follows. A bundle of 150-500 polyacrylonitrile long fibers is made into conducting fiber bundle by the chemical copper plating processing, which and/or the other metallic material and fiber material are compounded to form into the conducting core boasic member of cable. The basic members can becombined in the several modes so as to form the cable conducting core and shielding layer, and can also be woven into conducting fabric. The advantages of said soft cable are reliable performance, economical, practical, fatigue bending resistance and suitable for using as signal cable, control cable and power cable.

Description

Conductive fiber core flexible cable and technology thereof

The invention belongs to field of cables, relate to a kind of on insulation stent, the have several wire of conductive layer or conductive film or the flexible flexible cable of analog or braid formation.

People often find in daily life and work: drag electric wire on a lot of electric products, in frequent bending, move, the fault of the disconnected core of wiring conductive core takes place in the workplace of distortion, vibration easily.Thin more electric wire is because crooked process radius is little, and the probability that breaks down is just bigger.This is that material has rigidity because electric wire generally adopts the manufacturing of metal copper wire, and easily useless labor fractures under the situation of frequent bending, distortion.The copper wire spirality is wrapped on synthetic fibers, constitute the winding conductor wire core, can increase substantially the anti-useless labor bending performance of core, but also because of its conductive resistance and material consumption all will general copper core Senior Three doubly more than, only can on limited several little current signal core, use.According to Chinese invention patent CN89108702 in 1989, its authorization number is authorized the day for announcing 92,11,18 for CN 1019160B, name is called " New Type of Conductive Fibre Cable and Its (core) and technology thereof " and US 4634805 United States Patent (USP)s " conductor wire core (fiber) or conductive fabric " in 1985, and (" CONDUCTIVE CABLE OF FABRIC " date of patent 87,01,06 has adopted the acrylic filaments and the polyamide long fibre chemical plating metal formation conductive fiber of 1000-3000 root respectively.The anti-useless labor bending performance of this conductor wire core is fabulous.But the electric conductivity of above-mentioned two parts of described conductive fibers of patent is lower.Calculate according to the data that last two parts of patents provide.The dc resistance of conductive fiber and metal copper wire are by same length, and same cross section is calculated and increased about 10 times and 15 times respectively.

Adopt the technology of chemical plating metal, the part that high-molecular organic material is processed carries out the surface metalation processing, is method commonly used at present.Becoming it is to having the part plating of complex surface shape, and the uniformity of its coating is more satisfactory.To keep hundred-percent dynamic the contact between the surface of part and the plating bath of stirring.But to a branch of synthetic fibers plating, difficulty is than higher, because a bundle fiber is to be made of numerous long filaments, and bunchy flocks together, be positioned at the middle long filament of fibre bundle, directly the contact plating bath is just difficult more on its surface, and most of filament surfaces can only rely on the very big plating bath of a small amount of chemical composition graded that permeates to carry out, and coating is difficult to evenly.U.S. US 4634805 patents and Chinese CN 89108702 patents have all adopted streamline to make the production technology of conductive fiber, because it is very long to make the conductive fiber streamline, the radical of the intrafascicular long filament of synthetic fibers can not be very few, otherwise cross conference because of tractive effort fibre bundle broken.Under the effect of tractive effort and tension force, each threads of fibre bundle must be in marshalling, tensioning state parallel to each other, and the infiltration of chemical plating fluid is just difficult more, and the inhomogeneities of the coat of metal is also just more serious.Another problem of synthetic fiber bundle chemical plating metal is that meeting produces the hydrogen that cements out in a large number in the chemical plating process, all can be difficult in time get rid of totally attached to the inside or the outside of fibre bundle, makes the middle hole that produces of coated metal, causes coating loose.Address this problem and normally adopt machinery or pneumatic method to stir plating bath, get rid of the gas on plating piece surface.This method is unsatisfactory to the synthetic fibers plating piece effect of intensive bunchy.Same reason, the long filament radical of a bundle fiber is many more, and the problem that the inhomogeneities of the coat of metal and coating are loose is just serious more.The problem that directly reflects on the performance is exactly that the conductive fiber resistance value is high and unstable.

The object of the present invention is to provide a kind of conductive fiber core flexible cable and technology thereof, specifically, a kind of fully thin conductive fiber bundle at first is provided, be combined into multiple basic building block and the conductive fabric that the cable core of characteristics is respectively arranged as main body, and then the flexible cable of various different purposes and the copper-plating technique of conductive fiber thereof are provided.

The object of the present invention is achieved like this: the conductive fiber flexible cable comprises insulation oversheath, conductor wire core and the screen that optionally is provided with and interior insulation material layer; Its conductor wire core be based on the conductive fiber bundle or with the multiple conductive member of the compound composition of wire synthetic fibres through stranded, or braiding, or together wrapped and constitute; Its screen is made of the conductive fiber fabric that above-mentioned conductive member braiding forms; Said conductive fiber bundle is by 150 to the 500 root polypropylene nitrile long fibre Shu Zuchengs of line fineness less than 1 danier (denier), its every root polypropylene nitrile long fibre coating surface has the conductive metal layer copper of one deck even compact, and the copper-plating technique of its conductive fiber is that fibre bundle is in loose and is subjected to being interrupted and carries out disposable plating chemistry system under the squeezed state and finish in newly-designed coating bath.

For setting forth conveniently, earlier patent figures is described as follows:

Fig. 1 is a this patent electroless copper schematic diagram.

Fig. 2 is the structural representation of the copper-plated polyacrylonitrile fibre 7 of a section surface.

Fig. 3 is the schematic diagram of a branch of conductive fiber bundle 8.

Fig. 4 is a conductive fiber 9 schematic diagrames of twisting thread.

Fig. 5 is a conductive fiber 11 structural representations that wind the line.

Fig. 6 be one with the twist thread structural representation of the sth. made by twisting winding wire 13 that is core of conductive fiber.

Fig. 7 is the structural representation around winding wire 14 of core with the conductive fiber coiling for another root.

Fig. 8 is the conductive fiber of the center reinforcement structural representation of twisting thread.

Fig. 9 is the conductive fiber of a reinforcement arranged side by side structural representation of twisting thread.

The serve as reasons structural representation of cable of many conductive fiber bundles and the stranded formation of reinforcing fiber bundle of Figure 10.

Figure 11 is the structural representation of a conductive fiber coiling for the cable of core formation.

Figure 12 is for twisting with the fingers the structural representation that winding wire is the cable that constitutes of core by one.

Figure 13 is for being the structural representation of the cable that constitutes of core by one around winding wire.

The serve as reasons structural representation of the stranded cable that constitutes for core of many conductive fiber bundles of Figure 14.

Figure 15 for by one around the twist thread structural representation of the stranded cable that constitutes for core of winding wire and Duo Gen conductive fiber.

The structural representation of the cable that the screen that Figure 16 is woven into for employing conductive fiber bundle constitutes.

Figure 17 is the structural representation of the cable of the wrapped screen formation of employing conductive fiber bundle.

Figure 18 is for being woven the structural representation of the conductive fabric that constitutes by the conductive fiber bundle.

Below in conjunction with accompanying drawing this patent is elaborated.

The conductive fiber bundle is that (denier, polyacrylonitrile long fibre ldenier=1g/9000m) take the self-catalysis electroless copper to obtain less than 1 danier to a branch of 150～500 line fineness.

To at first giving processing before the polyacrylonitrile long fibre electroless copper.Give processing and mainly comprise three process: 1, oil removing: fibre bundle is immersed in the alkali unboiled water solution 2 minutes, removes the oil stain on fiber top layer, use the warm water rinsing clean again; 2, sensitization: the long fibre through the oil removing operation is handled, be dipped into stannous chloride again, in the aqueous hydrochloric acid solution 3 minutes, rinsing was clean gently for water again; 3, activation: the fibre bundle of handling through above-mentioned two procedures is immersed in palladium bichloride, boric acid, the aqueous hydrochloric acid solution 5 minutes again, and is clean with water rinse again.The tin that surface coverage one deck of the every threads of fibre bundle this moment is even, a small amount of, adhesion is strong and the ion cluster of palladium.

Just can carry out electroless copper through the long fibre bundle that gives processing handles.

See also Fig. 1, the equipment of electroless copper is by roll 1, coating bath 2, and baffle plate 4, plating bath 5 constitutes.Plating bath 5 is the aqueous solution by copper sulphate, NaOH, sodium potassium tartrate tetrahydrate, formaldehyde preparation.

The process of electroless copper is undertaken by following program: at first long fibre bundle 3 is evenly paved in the middle of two rolls 1 that are in coating bath 2 upper spaces, fibre bundle 3 bottoms are blocked with being immersed in the baffle plate 4 that is positioned at the nearly bottom of coating bath in the plating bath, fibre bundle 3 major parts are immersed in the plating bath 5, start roll 1, fibre bundle 3 is in loose in the electroless copper process and is subjected to being interrupted under the squeezed state and carries out, copperizing continuously 30 to 6 minutes is once finished copper-plating technique.Take off long fibre bundle 3, wash, dry through washing, alcohol again.

Evenly pave at roll 1 middle long fibre bundle 3 through giving processing, being in the major part that hangs shape is to be immersed in the plating bath 5, and the long fibre bundle 3 in running status also is subjected to the effect of three power except that being subjected to the little tractive effort of roll: 1, self forms downward gravity; 2,5 pairs of long fibre bundles of plating bath form a buoyancy that makes progress; 3, because long fibre bundle 3 is immersed in the plating bath 5 chemical reaction takes place, produce hydrogen, produced a buoyancy that makes progress again.Two buoyancy additions that make progress are greater than gravity, so what the long fibre bundle was subjected to making progress makes a concerted effort, can be floating, but being subjected to baffle plate 4 stops, still can be immersed in the plating bath 5, so the long fibre bundle 3 that is immersed in the plating bath 5 can only be in relaxed state, this just makes and forms discrete relatively shape in the long fibre bundle 3 between every threads, the long filament radical of every bundle is few more, and discrete shape is also unreasonable to be thought.Again because long fibre bundle 3 is subjected to roll 1 traction masterpiece circular motion, stirred plating bath, the circumferential surface that has so just guaranteed each threads of long fibre bundle can carry out fully effectively dynamically contacting with plating bath 5, thereby has guaranteed the unanimity of chemical reaction and the uniformity of fiber coating.During chemical reaction, each threads surface in the wire harness can produce the hydrogen that cements out to long fibre bundle 3 in plating bath 5, and the hydrogen of getting rid of on the long fibre bundle is finished by roll 1.Roll 1 has two effects: the one, and the tractive effort fibre bundle forms reciprocal circular motion; Two is the extruding forces that can form stronger (can adjust size) between two rolls, and the gas that adopts direct compression method to force chemical reaction process to produce is all in time got rid of totally from the long fibre bundle.The circulation that chemical reaction and this process of interruption extruding are not stopped carries out just forming at filament surface the copper layer of even compact.Because two runners of roll 1 are rightabout run-in synchronism, only produce traction and relative friction and shearing can not take place with the long fibre bundle, so bring any mechanical damage can not for superfine little fiber filament.Because the speed of service and the electroless plating reaction speed of roll are mated, also just can reduce the time of chemical reaction again.

Adopt a branch of 150～500, the line fineness is less than the polyacrylonitrile long fibered raw material of 1 dawn Buddhist nun happy (denier), place loose and take to be interrupted and carry out electroless copper under the extrusion process condition, adopt 1000 rhizoids with prior art, be in marshalling, carry out the conductive fiber that electroless copper is made under the process conditions parallel to each other, the technical performance that can reach has tangible difference.The conductive fiber 7 of this explained hereafter compares with aforesaid method: conductive direct current resistance reduces more than 50% on year-on-year basis; Tensile strength improves 20% on year-on-year basis.Because coat of metal quality height, plating speed is fast, the simple chemical plating conducting metal of technology no longer needs repeated multiple times to carry out, and only once just can finish.Filament surface also only is made of layer of metal copper coating 6.

The conductive fiber bundle 8 that adopts chemical plating process technology provided by the invention manufacturing is electric conductors of a kind of junior unit, selects different radical twisteds to get up to constitute line and directly twists thread for the conductive fiber of 0.20-0.4mm.

According to the test method of IEC 227 regulations, the anti-useless labor bending performance of this patent conductive fiber is better than 140,000 times, has surpassed 30,000 indications of IEC 227 regulations, has also exceeded the actual needed performance of most of cord cables.Though adopting conductive fiber electric conductivity provided by the invention and mechanical tensile strength all to have on the other hand increases substantially, but because the cross section of conductive fiber about 70% is the composite fibre materials of insulation, polyacrylonitrile self tensile strength also only is 2.5-3.0/denier, and only using conductive fiber separately is to be difficult to satisfy the performance requirement of most of soft type electric wire conductor wire cores to conduction and tensile strength as conductor wire core.

The present invention is with conductive fiber bundle and other metal material, the compound formation of nonmetallic materials, the conductor wire core basic building block of performance advantage complementation is again by the conductor wire core that constitutes to basic building block, to adapt to the requirement of different cultivars, specification soft type electric wire.

Below be multiple typical conductor wire core basic building block:

One of basic building block: conductive fiber bundle 8.Consult Fig. 2 and Fig. 3, it is by every root polypropylene nitrile filament 3 coating surface layer of metal copper 6, the conductive fiber filament 7 of formation, and many conductive fiber filaments 7 gather formation conductive fiber bundle 8.

Two of basic building block: conductive fiber twists thread 9.Consult Fig. 4, it is to be made of 8 twisting of conductive fiber bundle.

Three of basic building block: conductive fiber coiling 11.Referring to Fig. 5, it is to constitute on a thin copper wire or thin signal bronze silk 10 by a branch of conductive fiber bundle 8 spiralitys are wrapped.

Four of basic building block: twist with the fingers winding wire 13 and around winding wire 14.Consult Fig. 6 and Fig. 7, it is also can be the thin copper wire of single or many draw downs by single or many thin copper wires, thin signal bronze silks, wires 12 such as thin signal bronze silk, and wrapped the twisting thread at a conductive fiber of spirality 9 constitutes and twists with the fingers winding wires 13.Or in a conductive fiber coiling 11, constitute above-mentioned wire 12 is wrapped around winding wire 14.

At above-mentioned typical four kinds of basic building block centers or arranged side by side with basic building block, add the synthetic fiber bundle of high strength, low elastic force, can constitute the basic building block that one group of machinery tension strengthens again.Also can reach same reinforcement purpose as basic building block combination with reinforcement synthetic fiber bundle and conduction.Consult Fig. 8 and Fig. 9, twist thread 9 and be clipped in the center of twisting thread or constitute reinforcement conductive fiber line with the reinforcing fiber bundle 15 of twisting thread arranged side by side by conductive fiber.Equally, this reinforcement also can conduct electricity the basic building block combination with other.

Below multiple typical conductor wire core basic building block is done necessary explanation.

It 9 is to be made of the copper facing fine fibre silk that many diameters are about 0.01mm that conductive fiber bundle 8 and conductive fiber are twisted thread, and the general cord of anti-useless labor bending performance has improved more than 100 times.But because the conductive fiber filament, about 70% cross section is non-metallic fiber material, and relatively D.C. resistance is high about 5 times with the metal solid copper wire.So single conductive fiber bundle 8 can only be applicable to the screen of processing soft type electric wire; Single conductive fiber is twisted thread and 9 also only can be applicable to the screen of processing soft type electric wire and the conductor wire core of the little current signal cable of soft type.

Conductive fiber coiling 11.Owing to added a thin copper wire or thin signal bronze silk in the core, conductive fiber coiling D.C. resistance is twisted thread 2 times that reduce than conductive fiber.Though in the conductive fiber coiling, the anti-useless labor bending performance of fine wire can not show a candle to conductive fiber, in use frangibility still plays the conducting effect owing to conductive fiber is difficult to fracture; Mainly concentrate on indivedual positions of line segment again owing to the useless labor stress of most of electric wires in the use, as the root of wire connector, so fractureing of the indivedual positions of wire is also little to the general impacts of lead D.C. resistance.According to test: on the long line segment of 1m, each breakpoint of wire only is 0.05-0.1% to the influence of whole section lead D.C. resistance.Adopt signal bronze silk electric conductivity to reduce, but pliability improve than copper wire than copper wire.The conductive fiber coiling is applicable to the screen of soft type electric wire, also is applicable to the conductor wire core of soft type signal cable and control cable.Also can be suitable for minitype motivation cable conduction core.

General copper wire winding wire is to constitute on the carrier of a branch of synthetic fibers by one or more thin copper wire spirality is wrapped.Because synthetic fibers insulate, so the resistance value of the length that its dc resistance is a thin copper wire to launch, D.C. resistance and material consumption all improve more than three times than the straight line copper wire.Sth. made by twisting winding wire 13 of the present invention or be that conductive fiber twists thread 9 or conductive fiber coiling 11 around the carrier of winding wire 14, the gap between the winding spiral is constituted less straight line D.C. resistance by the conductive carrier conducting.So twisting thread than conductive fiber, electric conductivity improves 2.5-4.2 doubly.Best its line of combination of conductance is through only big on year-on-year basis by about 5% than entity copper wire.Wherein adopt draw down type wire, pliability is better than circular wire, adopt signal bronze silk pliability also to be better than copper wire, but electric conductivity is poor slightly than copper wire.Copper wire winding wire of the present invention also can be applied on the signal cable core applicable to the conductor wire core of control cable and power cable.

For proving absolutely characteristic feature of an invention, also be necessary the overall technical performance of conductor wire core basic building block is made comparisons.The D.C. resistance performance: the copper wire lead of different basic building blocks and entity is high relatively respectively 20% to 50%, resistivity between the basic building block differs four times, provides necessary make things convenient for condition from several milliamperes (holding wires) to the interior application of ampere (power line) such scopes up to a hundred for satisfying ampacity.The performance of the anti-useless labor bending of basic building block: also differ between the different members and reach about 10 times, but improve 10-100 more respectively doubly with general entity copper wire conductor wire core, advantage is still significantly.Owing to bigger control cable and the power cable of ampacity, the line footpath is all relatively thicker on the other hand, and the anti-useless labor bending performance of electric wire itself increases to geometric progression with the electric wire crooked process radius and improves.So in actual the use, control cable and power cable do not need to be equal to the design of the anti-useless labor bending performance of conductor wire core and tiny holding wire.Exactly because can be complementary on the designed conductor wire core basic building block performance, adopt the mode of component composition to be used for extensive fields so just might possess, simultaneously also can adopt most economical art designs scheme targetedly according to the actual operating position of different soft type electric wires.

Below be further elaborated adopting conductor wire core basic building block Combination Design to constitute typical soft serial cable.

Figure 10 is that same method also is applicable to the combination of other conduction basic building block reinforcement by many conductive fibers 9 cables that constitute with the stranded back of the fibre bundle 15 of reinforcement wrap insulate outer jackets 16 of twisting thread.

Referring to Figure 11, it is the cord that is made of a conductive fiber coiling 11 and insulation outer jacket 16.

Referring to Figure 12 and Figure 13, be the cord of twisting with the fingers winding wire 13 or constituting with insulation outer jacket 16 respectively by copper wire around winding wire 14.

Figure 11 to Figure 13 is made of the structural design scheme of conductor wire core a conductive fiber basic building block.Change the radical (at 500 with interior scope) of conductive fiber, change the thickness (generally between 0.05-0.15mm) of copper wire, change wire material (copper wire or signal bronze silk) and change cross sectional shape wiry (circle or flat), can design the cable of the soft type conductor wire core of one group of different size.The scope of main design parameters is: wire core diameter: 0.10-0.70mm; D.C. resistance: 0.1-6 Ω/m; Anti-useless labor buckling strength: 1-14 ten thousand times.

Referring to Figure 14, it is by the many conductive fibers 9 stranded conductor wire cores that constitute of twisting thread, and the cable that constitutes with insulation outer jacket 16.

Figure 14 adopts a plurality ofly to constitute soft type conductor wire core structural design scheme with a kind of basic building block.This compound mode equally also is suitable for conductive fiber coiling 11 and copper wire winding wire 13 and 14.By can design the cable of the soft type conductor wire core of one group of different size again to the adjustment of basic building block element.The scope of this group conductor wire core main design parameters the present known all specifications of general cord can be included, and the performance of anti-bending can be distinguished the corresponding 10-100 of raising doubly.

Referring to Figure 15, it be by conductive fiber twist thread 9 be stranded in constitute on the copper wire winding wire 14 conductor wire core and with the cable that constitutes of insulation outer jacket 16.

Figure 15 is the soft type conductor wire core structural design scheme that is constituted by multiple basic building block.This compound mode equally also can comprise conductive fiber coiling 11.The characteristics of this design are, participate in harder a kind of should being positioned in the middle of the conductor wire core in the basic building block of combination, and the core that is in this position probability that fractures will be lower than the core of circumferential surface.

Figure 16 is the construction of cable schematic diagram that contains the screen of useful conductive fiber bundle braiding.It is the insulation sheath 18 by the parcel conductor wire core, the screen 17 of conductive fiber bundle braiding, and the cable of cable jacket 16 formations.

Referring to Figure 17, it is the wrapped screen 17 of insulation sheath 18 usefulness conductive fiber bundles 8 by conductor wire core and parcel conductor wire core, the cable that cable jacket 16 constitutes.

Referring to Figure 16 and Figure 17, the mode of its processing cable screen also is suitable for conductive fiber and twists thread 9 and conductive fiber coiling 11.Adopt the conductive fiber bundle to make the screen of cable, topped area can reach and be bordering on 100%, in the lower range applications of frequency, have better shield effectiveness, and the employing conductive fiber is twisted thread and the screen of conductive fiber coiling manufacturing cable has less D.C. resistance.This can select for use according to the actual requirement of cable.Adopting two kinds of different basic building blocks to weave to the screen of cable also is feasible, complementary effect is also arranged on performance.The screen that adopts this patent to provide, soft performance also are significantly, are the difficult labor bending of giving up too.

Figure 18 be by conductive fiber twist thread 9 the braiding conductive fabrics.The fabric of conduction also can adopt conductive fiber coiling 11 braidings to constitute.

This patent has following useful effect:

1, the conductive fiber core flexible cable dependable performance that provides of this patent, economical and practical, anti-useless labor bending can Be applicable to respectively as the signal cable control cables and power cable.

2, the polyacrylonitrile conductive fiber bundle that provides of this patent compared with the prior art, its direct current resistance reduces on year-on-year basis 50%, tensile strength improves 20% on year-on-year basis.

3, the conductor wire core basic building block that is combined into by conductive fiber bundle and metal material, composite fibre materials that provides of this patent, adopt stranded, braiding, way combination such as wrapped to make to be suitable for different require and the soft anti-useless labor of occasion, anti-bending, ampacity at the milliampere quality cables of up to a hundred amperes of scopes extremely.Its use is wide.Application is big.

Claims (8)

1, a kind of conductive fiber core flexible cable, comprise insulation outer jacket (16), conductor wire core and the screen (17) and the inner insulating layer that optionally are provided with, it is characterized in that: its conductor wire core is based on conductive fiber bundle (8) or the stranded or braiding or wrappedly constitute with the multiple conductive member of the compound composition of wire synthetic fibres; Its screen is made of the conductive fabric that above-mentioned conductive member braiding forms; Its conductive fiber bundle (8) is made up of less than the polyacrylonitrile long fibre of 1 danier (denier) 150 to 500 fineness, and its every root polypropylene long fibre (3) coating surface has the conductive metal layer copper (6) of one deck even compact.

2, conductive fiber core flexible cable as claimed in claim 1 is characterized in that said a kind of conductive member is to gather conductive fiber that twisting constitutes twist thread (9) with multi beam conductive fiber bundle (8).

3, conductive fiber core flexible cable as claimed in claim 1 is characterized in that said a kind of conductive member is to go up and the conductive fiber coiling (11) of formation at a thin copper wire or signal bronze silk (10) so that one group of conductive fiber bundle (8) helical form is wrapped.

4, conductive fiber core flexible cable as claimed in claim 2, it is characterized in that said a kind of conductive member be with conductive fiber twist thread (9) be the center, its periphery and sth. made by twisting winding wire (13) of constituting wrapped by single or many one metal wires (12) spirality.

5, conductive fiber core flexible cable as claimed in claim 3 is characterized in that said a kind of conductive member is be the center with conductive fiber coiling (11), its periphery by single or many fine wires (12) spirality is wrapped and formation around winding wire (14).

6, conductive fiber core flexible cable as claimed in claim 2 is characterized in that said a kind of conductive member is to twist thread (9) and be clipped in the center of twisting thread or reinforcing fiber bundle (15) arranged side by side and the reinforcement conductive fiber line that constitutes with conductive fiber.

7, as claim 4 or 5 described conductive fiber core flexible cables, it is characterized in that said fine wire (12) is the thin copper wire of thin copper wire or draw down, or the thin signal bronze silk of thin signal bronze silk or draw down.

8, a kind of copper-plating technique of conductive fiber of conductive fiber core flexible cable, at first be that the polyacrylonitrile long fibre is carried out soaking oil removing respectively in alkaline solution, at stannous chloride, sensitization and at palladium bichloride in the aqueous hydrochloric acid solution, boric acid, activation is given and being handled and washing in the aqueous hydrochloric acid solution, enter again by copper sulphate, NaOH, sodium potassium tartrate tetrahydrate, copper facing in the electroless plating tank of the plating bath that the aqueous solution of formaldehyde preparation is formed, wash then, alcohol is washed with drying and is formed, it is characterized in that: polyacrylonitrile long fibre bundle (3) evenly paves middle at two rolls (1) that are in coating bath (2) upper space, fibre bundle (3) bottom is blocked with being immersed in the baffle plate (4) that is positioned at the nearly bottom of coating bath in the plating bath, and fibre bundle (3) major part is immersed in the plating bath (5); Start roll (1) fibre bundle (3) and be in loose in the electroless copper process and be subjected to being interrupted under the squeezed state and carry out, copperizing continuously 30 to 60 minutes is once finished copper-plating technique.

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