CN102866475A - Secondary optical fiber and optical fiber ribbon coating composite production equipment and method using equipment - Google Patents
Secondary optical fiber and optical fiber ribbon coating composite production equipment and method using equipment Download PDFInfo
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- CN102866475A CN102866475A CN2012103705359A CN201210370535A CN102866475A CN 102866475 A CN102866475 A CN 102866475A CN 2012103705359 A CN2012103705359 A CN 2012103705359A CN 201210370535 A CN201210370535 A CN 201210370535A CN 102866475 A CN102866475 A CN 102866475A
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Abstract
The invention discloses secondary optical fiber and optical fiber ribbon coating composite production equipment which comprises an electric control system for supplying various types of control signals to controlled equipment and receiving state parameters of the controlled equipment, wherein the controlled equipment comprises an optical fiber ribbon pay-off twisting body, an optical fiber pay-off device, a degassing and filling device, an SZ twisting device, an extrusion machine, a residual length dragging machine, a hot water tank, a track dragging machine, a cold water tank, a main dragging wheel and a take-up device; the mounting sequence of the controlled equipment is as follows: the optical fiber ribbon pay-off twisting body, the optical fiber pay-off device, the SZ twisting device, the degassing and filling device, the extrusion machine, the hot water tank, the residual length dragging machine, the track dragging machine, the cold water tank, the main dragging wheel and the take-up device; and an optical fiber and an optical fiber ribbon are sequentially processed along an input direction and an output direction of each set of controlled equipment. According to a technical requirement, a product coated with the optical fiber and the optical fiber ribbon can be produced on the same equipment. The invention also discloses a corresponding production method.
Description
Technical field
The present invention relates to a kind of production equipment, particularly relate to a kind of production equipment for optical fiber, fibre ribbon manufacturing.
Background technology
Optical cable mainly is made of optical fiber and optical cable band, by bare fibre make that optical fiber and optical cable band need to be filled through optical fiber or the permanent tension force output of fibre ribbon, ointment, loose casing pipe sleeve is moulded, the procedure of processings such as crystallization, cooling contraction, traction and upper dish, need to utilize corresponding manufacturing and processing equipment.
In the technological process of producing the fibre ribbon beam tube, mainly need the equipment such as optical fibre belt paying out winder, optical fiber wire releasing device, extruder, bubble removing filling device, hot water storgae, caterpillar-tractor, cold rinse bank, main traction wheel, three-wheel tensioner, take-up.
In the technological process of producing optical fiber bundle tubes, mainly need the equipment such as optical fiber wire releasing device, SZ stranding device, extruder, degasification filling device, hot water storgae, remaining long traction engine, cold rinse bank, main traction wheel, take-up.
As shown in Figure 1, loose sleeve pipe has two kinds of versions, the aggregate that they all are comprised of several optical fiber or fibre ribbon overcoat one deck coated tube.
As shown in Figure 2, the assembly of elements of optical fiber wire releasing device adopts the cabinet type structure, is convenient to the combination of optical fiber pay-off unit, compact conformation; The active release wire system of oscillating rod type tension force control, the optical fiber laying tension is stable; A plurality of optical fiber guide wheel group make things convenient for optic fibre wire; The drum quick clamping mechanism is increased work efficiency.
As shown in Figure 3, the SZ stranding device is used for the stranded of multifiber, is comprised of a box twisting part and a rail plate, and whole casing can be free to slide at rail plate, is used for satisfying user's different demands.Fixedly distributor plate and a rotary distributor plate form the twisting head by one.A twisting maximum twist angle is ± 340 °, and adjustable continuously.
As shown in Figure 4, optical fibre belt paying out winder is used for large core and counts the fibre ribbon unwrapping wire, adopt multiple twin cage Synchronous Radio line type structure, the prime cage is 12 dish cages, and the rear class cage is 6 dishes or 12 dish cages, realizes the synchronous unwrapping wire of each light pricker band in two cages by main motor synchronous rotary.Cage is whole closed-in construction, and multipotency fills the standard fiber band pay-off unit of 24 (road) φ 410 * φ 50.8 * 391mm.Fibre ribbon is the active release band, and the speed of optical fiber tep reel and fibre ribbon tension force are to control by a flexible force cell system.This closed-loop system adopts import Lenze alternating current generator+import Lenze transducer drive.Adopt the PLC control system, every road tension force can touch screen display, and adjustable online.After fibre ribbon is emitted, be directed to branch means through guide wheel group, after ointment is pre-filled, introduce and the band mould, and then be inducted into extrusion dies after making fibre ribbon in an orderly manner, closely loosely not being overlapped into one.
As shown in Figure 5, the degasification filling device is transported to ointment the centrifugal pan of this device from the ointment bucket for the glue gear-type pump, by driven by motor centrifugal pan High Rotation Speed, makes the ointment of bubbles carry out gas-oil separation, and by vacuum pump bubble is extracted out.Bubble-free ointment is stored in the glue bucket of sealing after being thrown out of centrifugal pan, and then by being extracted out by the supply gear pump, the volume pump that a part is driven by panasonic AC servo motor is transported to the cross head and fills, and another part is transmitted back to centrifugal pan circulation degasification.
Extruder is used for melting plastics, and extruder adopts the Z4 DC servo-motor to drive, and adopts PBT material bolt special to add the heating of thermal recovery Multi sectional, to guarantee that plastics can fully melt.Extruder also comprises the adjustable offset head, may cause the concentricity of core rod and die sleeve that certain error is arranged during owing to Mould Machining, when producing the Large Diameter Pipeline sleeve pipe, can be comparatively obvious on the impact that sleeve pipe external diameter circularity causes, and the adjustable offset head is used for revising this class error.Extruder also comprises drying unit, and drying unit is contained on the extruder barrel, and bake out temperature can be set according to extruded material, is used for guaranteeing to enter the plastics drying of extruder, thereby guarantees to extrude the quality of product.
Hot water storgae adopts the lateral soaking formula to move tank, and hot water V-arrangement bucket lower side from mobile tank enters, and the V-arrangement bucket is under water, because current are comparatively steadily very little to the sleeve pipe impact, the evenness of wall thickness of extruding sleeve pipe is better.Avoided being subjected to water currents large because fibre ribbon pine sleeve pipe external diameter is larger when under molten condition, entering in the water, the problems such as casing wall thickness is inconsistent when using common fountain tank cooling, can occur.
Be two kinds of wheeled remaining long traction engines as shown in Figure 6 and Figure 7, for the production of small casing.This device adopts case structure, and the whole stainless steel material that adopts is made, and is furnished with aluminium alloy rolling-gate, can prevent that water spills casing in the production run.Main traction wheel adopts stainless steel to be welded, and some of branching wheels have the line guide rod of dialling and can adapt to different cables footpath separated time on the main traction wheel.Adopt the single-wheel traction among Fig. 6, when High Rotation Speed, have skidding to produce, when adopting the branching wheel structure of Fig. 7, can increase the cornerite of beam tube on traction wheel and increase friction, reduce skidding.
As shown in Figure 8, caterpillar-tractor is mainly used in optical fiber production with well.This device is comprised of a box-type shell, running part and Pneumatic pressure tape cell.Up and down the fixed head of pressure zone by cylinder control can be up and down the flexible mobile cable of pressing, but by regulating the force value of reduction valve control cylinder, thereby the control traction belt is to the force value of beam tube.
Cold rinse bank is used for making fully crystallisation by cooling of Large Diameter Pipeline sleeve pipe, and bosh adopts 20m length to widen tank, has been equipped with simultaneously high-power refrigeration unit.Adopt the retaining bucket to connect between every water-saving groove and guarantee that every water-saving groove has enough chilled waters.
The blowing dryer device is fixed on last lower bucket of cold rinse bank, can guarantee that like this water that blows out all flows in the lower bucket.The source of the gas central gas supply that dries up.Blowing dryer forms by 2 half, opens very flexibly, and profile is small and exquisite.
Wire diameter and bulge detector are used for detecting the degree of accuracy of beam tube external diameter, and this device control accuracy is high, can reach ± 0.001mm.
As shown in Figure 9, the three-wheel tensioner is the control device of large and small beam tube compatibility, adopts three wheels versions.The Da Song sleeve pipe adopts the form of three wheels tension pick-ups control tension force, and tension force can be adjusted online.The Xiao Song sleeve pipe adopts the dancing device form.Sensor signal FEEDBACK CONTROL haulage speed.Tension value is in main monitoring screen display, setting.
As shown in figure 10, main traction wheel provides necessary tractive force to whole production line during for the production of large sleeve pipe, the stretching of convenient large sleeve pipe, and it has determined the speed of production of production line.This device is again to produce one of remaining long critical piece, and the remaining long necessary pulling force that produces is provided; The generation of the remaining length of fibre ribbon is relevant with the size of tractive force, elastic deformation occurs in large sleeve pipe under the effect of tractive force, in case lose tractive force, sleeve pipe returns to the original length, and the fibre ribbon of inside pipe casing still keeps existing length, and therefore excess fiber length produces.Comprising driving wheel and branching wheel.
This device is comprised of framework, fairlead, pressure cable device, branching wheel, driving wheel and drive part.Fairlead is installed in respectively inlet wire and line outlet, guarantees that the position of cable is not offset; Branching wheel adjustable tilt angle is guaranteed good separated time effect; Driving wheel is driven through worm reducer by the AC servo motor of 4kw, and is furnished with the pressure cable device at periphery, and the belt snap-in force of belt pressing device is controlled by cylinder, and cylinder pressure can be regulated.
As shown in figure 11, Pneumatic swing rod-type dancing device, formed by support, a pressure cable wheel and a cantilever dancing wheel, the dancing wheel is by a cylinder supports, can come adjusting cylinders pressure to set the tension force of dancing wheel by adjusting precise pressure regulating valve, the cantilever other end be equipped with an angular transducer, the speed of regulating take-up by the signal of this sensor, make loose tube fiber overhead keep a constant distance, namely keep a constant tension force.
As shown in figure 12, take-up, the whole case structure that adopts of the full-automatic winding and arranging device of double plate, mainly promote clamping unit, winding displacement unit, switch travel mechanism, catch line cut-off machine structure and system framework by take-up unit, drum, be applicable to PN800 and PN630 specification drum, compact conformation, the occupation of land space is little.
Optical fiber and fibre ribbon pine casing pipe sleeve are moulded as optical fiber provides the mechanical protection of further resistance to compression, tension and are produced excess fiber length.The generation of excess fiber length is so that optical cable has superior machinery, physical property.Simultaneously owing to filled thixotropic ointment in the loose sleeve pipe, when having wall pressure to act on the loose sleeve pipe, the distortion that loose sleeve pipe produces can direct effect to optical fiber, for optical fiber provides effective mechanical protection.
Optical fiber and fibre ribbon are secondary coated to be the operation of most critical during communications optical cable is made.The technique of most critical is that control optical fiber or fibre ribbon form certain remaining length in beam tube in this operation.In the existing secondary coated production equipment, optical fiber secondary cocoon production equipment and the secondary coated equipment of fibre ribbon are two kinds of different production equipments, the optical fiber secondary cocoon production equipment generally stretches to realize that by the heat of beam tube raw material PBT optical fiber forms certain remaining length in beam tube, and the secondary coated production equipment of fibre ribbon generally method flexible by heat or elastic telescopic realizes that fibre ribbon forms certain remaining length in beam tube.Because the characteristic of PBT material self, its heat is flexible certain scope, thereby causes remaining long scope to suffer restraints.And during the method by elastic shrinkage, to carry out elastic stretching after forming certain tension force by main traction wheel halved tie pipe, the rear beam tube of tension force disappearance shrinks and causes optical fiber to form remaining length, and it is wide that the method forms remaining long scope, the also easier accurate control of hotter flexible method of while.
Because domestic fiber optic cable makers need to be bought two kinds of production equipments that structure is different simultaneously when producing optical fiber bundle tubes and fibre ribbon beam tube, cause the existing equipment cost of investment high, the utilization rate of equipment is low, can't realize a tractor serves several purposes.Therefore be badly in need of the high efficiency production optical fiber bundle tubes of a kind of energy and fibre ribbon beam tube, can realize the compound production equipment of incogruent long control mode simultaneously, meet the demand of current fiber optic cable makers.
Summary of the invention
The purpose of this invention is to provide the secondary coated composite production device of a kind of optical fiber and fibre ribbon, solve the technical matters of optical fiber and the secondary coated inefficiency of fibre ribbon, equipment configuration repetition.
Another object of the present invention provides the method for utilizing foregoing invention, solves the low technical matters of the secondary coated remaining long control accuracy of optical fiber and fibre ribbon.
The secondary coated composite production device of optical fiber of the present invention and fibre ribbon, be included as the electric-control system that controlled plant provides all kinds of control signals and receives the controlled plant state parameter, wherein: described controlled plant comprises optical fibre belt paying out winder (1), optical fiber wire releasing device (2), SZ stranding device (4), degasification filling device (3), extruder (5), hot water storgae (7), remaining long traction engine (6), caterpillar-tractor (8), cold rinse bank (9), main traction wheel (10) and the take-up (12) that sets gradually.
Described controlled plant also comprises the three-wheel tensioner, is installed between cold rinse bank and the main traction wheel, is used for measuring on-line tension by tension pick-up.
Described optical fibre belt paying out winder contains 24 road light pricker band pay-off unit.
Described optical fiber wire releasing device contains 12 road light pricker pay-off unit.
Described main traction wheel adopts press belt type master traction wheel.
Described hot water storgae length is made as 8m to 10m, and totally two joints are distributed in both sides, remaining long traction engine front and back, form the I and II hot water storgae.
Described cold rinse bank length setting is 16m to 20m.
The method of producing according to described optical fiber and the secondary coated composite production device of fibre ribbon, when producing the fibre ribbon beam tube, the multi-channel optical fibre band forms a fibre ribbon matrix that stacks in order and have certain screw pitch after emitting by the permanent tension synchronous of optical fibre belt paying out winder; The fibre ribbon matrix enters in the filling rifle in the head that is installed on the extruder, carrying out ointment by the degasification filling device fills, fibre ribbon enters in the PBT beam tube that head extrudes with ointment, the beam tube of melting is carrying fibre ribbon and is entering in the first order hot water storgae, and in the hot water of specified temp crystalline forming, beam tube after the moulding is drawn by caterpillar-tractor, then beam tube enters further cooling and generation contraction in the cold rinse bank, then enter main traction wheel, three-wheel tensioner between caterpillar-tractor and main traction wheel, make the PBT beam tube be subject to a constant tension force, it is just remaining long to obtain fibre ribbon after tension force discharges, last beam tube is by coiling on the take-up, and whole production run finishes.
The method of producing according to described optical fiber and the secondary coated composite production device of fibre ribbon, when producing optical fiber bundle tubes, after optical fiber is emitted by the permanent tension force of optical fiber wire releasing device, enter after stranded by the SZ stranding device in the filling rifle in the head that is installed on the extruder, carrying out ointment by the degasification filling device fills, optical fiber enters in the PBT beam tube that head extrudes with ointment, the beam tube of melting is carrying optical fiber and is entering in the first order hot water storgae, and in the hot water of specified temp crystalline forming, beam tube after the moulding is wrapped on the remaining long traction engine, traction engine locks optical fiber, enters in the cold rinse bank further cooling and produces when shrinking at beam tube, and optical fiber is locked can not to bounce back, in beam tube, form certain just remaining length, then enter main traction wheel, last beam tube is by coiling on the take-up, and whole production run finishes.
Utilize the secondary coated composite production device of optical fiber of the present invention and fibre ribbon, can finish the production of the product of optical fiber and two kinds of different structures of fibre ribbon coating at same equipment by technological requirement, improve the utilization rate of equipment, greatly reduce the device fabrication cost.The present invention adopts 24 road fibre ribbon pay-off unit can realize the production of maximum 576 core beam tubes, and speed of production significantly improves.
Utilize the present invention accurately to control the remaining progress row of different product by incogruent long control technique.
Below in conjunction with accompanying drawing embodiments of the invention are described further.
Description of drawings
Fig. 1 is two kinds of version synoptic diagram of loose sleeve pipe;
Fig. 2 is optical fiber wire releasing device primary structure synoptic diagram in the prior art;
Fig. 3 is SZ stranding device primary structure synoptic diagram in the prior art;
Fig. 4 is optical fibre belt paying out winder primary structure synoptic diagram in the prior art;
Fig. 5 is degasification filling device primary structure synoptic diagram in the prior art;
Fig. 6 is a kind of remaining long traction engine primary structure synoptic diagram in the prior art;
Fig. 7 is a kind of remaining long traction engine primary structure synoptic diagram in the prior art;
Fig. 8 is caterpillar-tractor primary structure synoptic diagram in the prior art;
Fig. 9 is three-wheel tensioner primary structure synoptic diagram in the prior art;
Figure 10 is main traction wheel primary structure synoptic diagram in the prior art;
Figure 11 is Pneumatic swing rod-type dancing device primary structure synoptic diagram in the prior art;
Take-up primary structure synoptic diagram in Figure 12 prior art;
Figure 13 is the structural representation of optical fiber of the present invention and the secondary coated composite production device of fibre ribbon.
Embodiment
As shown in figure 13, the secondary coated composite production device of optical fiber of the present invention and fibre ribbon, be included as the electric-control system 13 that controlled plant provides all kinds of control signals and receives the controlled plant state parameter, controlled plant comprises optical fibre belt paying out winder 1, optical fiber wire releasing device 2, degasification filling device 3, SZ stranding device 4, extruder 5, remaining long traction engine 6, hot water storgae 7, caterpillar-tractor 8, cold rinse bank 9, main traction wheel 10, take-up 12;
The erection sequence of controlled plant is: optical fibre belt paying out winder 1, optical fiber wire releasing device 2, SZ stranding device 4, degasification filling device 3, extruder 5, hot water storgae 7, remaining long traction engine 6, caterpillar-tractor 8, cold rinse bank 9, main traction wheel 10 and take-up 12;
Optical fiber and fibre ribbon order are sequentially finished corresponding procedure of processing along each controlled plant input direction, outbound course.
The secondary coated composite production device of optical fiber of the present invention and fibre ribbon, controlled plant also comprises three-wheel tensioner 11, is installed between cold rinse bank 9 and the main traction wheel 10, is used for measuring on-line tension by tension pick-up.
Optical fibre belt paying out winder 1 contains 24 road light pricker band pay-off unit.
Optical fiber wire releasing device 2 contains 12 road light pricker pay-off unit.
Remaining long traction engine 6 adopts the dicycly structure, and the driving wheel diameter is 800mm, and branching wheel divides three, and diameter is 300mm;
Cold rinse bank 9 length settings are 16m to 20m;
Caterpillar-tractor 8 places between remaining long traction engine 6 rear side hot water storgaes 7 and the cold rinse bank 9.
The method of utilizing the secondary coated composite production device of optical fiber of the present invention and fibre ribbon to produce, specific implementation process is as follows:
When producing the fibre ribbon beam tube, the multi-channel optical fibre band forms a fibre ribbon matrix that stacks in order and have certain screw pitch after emitting by optical fibre belt paying out winder 1 permanent tension synchronous.This fibre ribbon matrix enters in the filling rifle in the head that is installed on the extruder 5, carrying out ointment by degasification filling device 3 fills, fibre ribbon enters in the PBT beam tube that head extrudes with ointment, the beam tube of melting is carrying fibre ribbon and is entering in the first order hot water storgae 7, and in the hot water of specified temp crystalline forming, next the beam tube after the moulding is drawn by caterpillar-tractor 8, it be responsible for to give the PBT beam tube one of extruding from head stable haulage speed, then beam tube enters further cooling and generation contraction in the cold rinse bank 9, then enter main traction wheel 10, between caterpillar-tractor 8 and main traction wheel 10, three-wheel tensioner 11 is arranged, it makes the PBT beam tube be subject to a constant tension force, it is just remaining long to obtain fibre ribbon after tension force discharges, and last beam tube is by dish on the take-up 12, and whole production run finishes.
When producing optical fiber bundle tubes, after optical fiber is emitted by optical fiber wire releasing device 2 permanent tension force, enter after stranded by SZ stranding device 4 in the filling rifle in the head that is installed on the extruder 5, carrying out ointment by degasification filling device 3 fills, optical fiber enters in the PBT beam tube that head extrudes with ointment, the beam tube of melting is carrying optical fiber and is entering in the first order hot water storgae 7, and in the hot water of specified temp crystalline forming, next the beam tube after the moulding is wrapped on the remaining long traction engine 6, traction engine locks optical fiber, enter in the cold rinse bank 9 further cooling and produce when shrinking at beam tube, optical fiber is locked can not to bounce back, and forms certain just remaining length in beam tube, then enters main traction wheel 10, last beam tube is by dish on the take-up 12, and whole production run finishes.
When adopting the secondary coated composite production device of optical fiber of the present invention and fibre ribbon to produce, optical fiber secondary cocoon product core number is 12 cores, and speed of production can reach 260～300m/min; The secondary coated product core of fibre ribbon is counted maximum and can be reached 576 cores, and speed of production can reach 30～70m/min.
Above-described embodiment is described preferred implementation of the present invention; be not that scope of the present invention is limited; design under the prerequisite of spirit not breaking away from the present invention; various distortion and improvement that those of ordinary skills make technical scheme of the present invention all should fall in the definite protection domain of claims of the present invention.
Claims (9)
1. an optical fiber and the secondary coated composite production device of fibre ribbon, be included as the electric-control system (13) that controlled plant provides all kinds of control signals and receives the controlled plant state parameter, it is characterized in that: described controlled plant comprises optical fibre belt paying out winder (1), optical fiber wire releasing device (2), SZ stranding device (4), degasification filling device (3), extruder (5), hot water storgae (7), remaining long traction engine (6), caterpillar-tractor (8), cold rinse bank (9), main traction wheel (10) and the take-up (12) that sets gradually.
2. the secondary coated composite production device of optical fiber according to claim 1 and fibre ribbon, it is characterized in that: described controlled plant also comprises three-wheel tensioner (11), be installed between cold rinse bank (9) and the main traction wheel (10), be used for measuring on-line tension by tension pick-up.
3. the secondary coated composite production device of optical fiber according to claim 2 and fibre ribbon, it is characterized in that: described optical fibre belt paying out winder (1) contains 24 road light pricker band pay-off unit.
4. the secondary coated composite production device of optical fiber according to claim 3 and fibre ribbon, it is characterized in that: described optical fiber wire releasing device (2) contains 12 road light pricker pay-off unit.
5. the secondary coated composite production device of optical fiber according to claim 4 and fibre ribbon is characterized in that: described main traction wheel (10) employing press belt type master traction wheel.
6. the secondary coated composite production device of optical fiber according to claim 4 and fibre ribbon, it is characterized in that: described hot water storgae (7) length is made as 8m to 10m, and totally two joints are distributed in both sides, remaining long traction engine (6) front and back.
7. the secondary coated composite production device of optical fiber according to claim 4 and fibre ribbon, it is characterized in that: described cold rinse bank (9) length setting is 16m to 20m.
8. the method for producing to 7 arbitrary described optical fiber and the secondary coated composite production device of fibre ribbon according to claim 1, it is characterized in that: when producing the fibre ribbon beam tube, the multi-channel optical fibre band forms a fibre ribbon matrix that stacks in order and have certain screw pitch after emitting by the permanent tension synchronous of optical fibre belt paying out winder (1); The fibre ribbon matrix enters in the filling rifle in the head that is installed on the extruder (5), carrying out ointment by degasification filling device (3) fills, fibre ribbon enters in the PBT beam tube that head extrudes with ointment, the beam tube of melting is carrying fibre ribbon and is entering in the first order hot water storgae (7), and in the hot water of specified temp crystalline forming, beam tube after the moulding is drawn by caterpillar-tractor (8), then beam tube enters further cooling and generation contraction in the cold rinse bank (9), then enter main traction wheel (10), three-wheel tensioner (11) between caterpillar-tractor (8) and main traction wheel (10), make the PBT beam tube be subject to a constant tension force, it is just remaining long to obtain fibre ribbon after tension force discharges, last beam tube is by the upper dish of take-up (12), and whole production run finishes.
9. the method for producing to 7 arbitrary described optical fiber and the secondary coated composite production device of fibre ribbon according to claim 1, it is characterized in that: when producing optical fiber bundle tubes, after optical fiber is emitted by the permanent tension force of optical fiber wire releasing device (2), enter after stranded by SZ stranding device (4) in the filling rifle in the head that is installed on the extruder (5), carrying out ointment by degasification filling device (3) fills, optical fiber enters in the PBT beam tube that head extrudes with ointment, the beam tube of melting is carrying optical fiber and is entering in the first order hot water storgae (7), and in the hot water of specified temp crystalline forming, beam tube after the moulding is wrapped on the remaining long traction engine (6), traction engine locks optical fiber, enter in the cold rinse bank (9) further cooling and produce when shrinking at beam tube, optical fiber is locked can not to bounce back, in beam tube, form certain just remaining length, then enter main traction wheel (10), last beam tube is by the upper dish of take-up (12), and whole production run finishes.
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