CN114019639B - Bulletproof optical cable and preparation method thereof - Google Patents
Bulletproof optical cable and preparation method thereof Download PDFInfo
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- CN114019639B CN114019639B CN202210007601.XA CN202210007601A CN114019639B CN 114019639 B CN114019639 B CN 114019639B CN 202210007601 A CN202210007601 A CN 202210007601A CN 114019639 B CN114019639 B CN 114019639B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4479—Manufacturing methods of optical cables
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4429—Means specially adapted for strengthening or protecting the cables
- G02B6/443—Protective covering
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4429—Means specially adapted for strengthening or protecting the cables
- G02B6/44384—Means specially adapted for strengthening or protecting the cables the means comprising water blocking or hydrophobic materials
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- Ropes Or Cables (AREA)
Abstract
The invention discloses a bulletproof optical cable which comprises a water blocking tape, an optical cable subunit, a loose tube, water blocking yarns, an armor layer, a water blocking tape, an aramid tape and an outer sheath, wherein the optical cable subunit comprises a subunit jacket layer and an optical fiber bundle, the water blocking tape longitudinally wraps the subunit jacket layer, the loose tube is sleeved on the water blocking tape through extrusion molding, the water blocking yarns are attached to the outer wall of the loose tube, the armor layer adopts FRP strips, the FRP strips wrap the loose tube and wrap the water blocking yarns, the water blocking tape wraps the armor layer, the aramid tape wraps the water blocking tape, and the outer sheath is sleeved on the aramid tape through extrusion molding. The FRP strip is wound on the loose tube, so that a good rat-proof effect can be achieved. The aramid fiber belt is wrapped with the FRP strips, so that a good bulletproof effect can be achieved, and the production efficiency can be greatly improved by adopting the wrapped aramid fiber belt. The optical cable has the advantages of simple structure, light weight, small diameter, high optical fiber density and good tensile force performance.
Description
Technical Field
The invention belongs to the field of optical cables, and particularly relates to a bulletproof optical cable and a preparation method thereof.
Background
Often birds stand on the optical cable on the common aerial optical cable, people shoot the birds on the optical cable to damage the optical cable, the optical cable is generally broken by gunshot, communication interruption is directly caused, and great economic loss is caused, an efficient bulletproof optical cable comes into force, and CN107422435A discloses an ultra-soft temperature-resistant bulletproof optical cable and a production method thereof, wherein the optical cable comprises a cable core, a plastic foaming layer, a bulletproof armor layer and an outer sheath layer, the surface of the cable core is provided with the plastic foaming layer, the outer side of the plastic foaming layer is provided with the bulletproof armor layer, and the outer side of the bulletproof armor layer is provided with the outer sheath layer; the cable core includes that the optical fiber unit and the central reinforcement that adopt the SZ transposition mode to be in the same place, and the optical fiber unit is including covering optic fibre and loose tube, and the outside of covering optic fibre is being wrapped up in to the loose tube parcel, and the central reinforcement includes flexible reinforcement and wraps up in the outside PE restrictive coating of flexible reinforcement, and the oversheath layer is the bellows sheath. The bulletproof armor layer is made of woven aramid fiber, although the structure can prevent bullets, the production efficiency of the woven aramid fiber is low, the cable core is stranded by SZ, the diameter of the optical cable is large, the loose tube is made of factice to block water, the construction efficiency is affected, the environment is not protected, and meanwhile, when the optical cable is introduced into the ground, the rat-proof performance of the optical cable is poor.
Disclosure of Invention
Aiming at the defects or improvement requirements of the prior art, the invention provides a bulletproof optical cable and a preparation method thereof, wherein the bulletproof optical cable can prevent rats and bullets and is environment-friendly, and the optical cable has the advantages of small diameter, high optical fiber density, good tensile property, strong environmental viability, rat and bullet prevention, environment friendliness, high construction efficiency and the like.
In order to achieve the above object, according to one aspect of the present invention, there is provided a bulletproof optical cable, which includes an inner water blocking tape, an optical cable subunit, a loose tube, water blocking yarns, an armor layer, an outer water blocking tape, an aramid tape, and an outer jacket, where the optical cable subunit includes a subunit jacket layer and an optical fiber bundle disposed in the subunit jacket layer, the inner water blocking tape longitudinally wraps the subunit jacket layer, the loose tube is sleeved on the inner water blocking tape by extrusion molding, the water blocking yarns are attached to an outer wall of the loose tube, the armor layer is made of FRP strips, the FRP strips wrap the loose tube and also wrap the water blocking yarns, the outer water blocking tape wraps the armor layer, the aramid tape wraps the outer water blocking tape, and the outer jacket is sleeved on the aramid tape by extrusion molding.
Preferably, the internal water blocking tape comprises a water blocking non-woven fabric and a water blocking sponge layer attached to the water blocking non-woven fabric, the water blocking sponge layer comprises a sponge layer and a water blocking material adhered to the surface of the sponge layer, the water blocking sponge layer is in contact with the optical cable subunit, and the water blocking non-woven fabric is in contact with the loose tube.
Preferably, more than one water-blocking yarn is firstly placed on the outer wall of the loose tube in a straight mode and then wrapped by more than one water-blocking yarn in a winding mode.
Preferably, the optical fiber bundle comprises a plurality of colored optical fibers, wherein a portion of the colored optical fibers are coated with a water blocking coating.
Preferably, the subunit jacket layer is made of modified TPEE material.
Preferably, the optical cable subunit is in an SZ stranded state in the loose tube.
Preferably, the FRP strips are spirally wrapped around the loose tube at a set pitch.
Preferably, the outer sheath is made of HDPE or MDPE material.
Preferably, the loose tube is made of polypropylene material.
According to another aspect of the present invention, there is also provided a method for preparing a bulletproof optical cable, comprising the steps of:
1) and (3) coloring the optical fiber: coloring the optical fiber according to the national standard full chromatogram, and curing the colored optical fiber through a curing furnace to form a colored optical fiber;
2) coating a water-blocking paint on the colored optical fiber: the surfaces of some colored optical fibers are coated with a layer of water-blocking paint, and the water-blocking paint is natural in color;
3) producing an optical cable subunit: the modified TPEE material is extruded to form a subunit sheath layer which is sleeved on an optical fiber bundle consisting of a plurality of optical fibers, and the subunit sheath layer and the optical fiber bundle together form an optical cable subunit;
4) producing a loose tube: the optical cable subunits are paid off on an optical fiber pay-off rack, a plurality of optical cable subunits are twisted together on an SZ twisting table and then enter a longitudinal wrapping machine, an inner water blocking tape longitudinally wraps the optical cable subunits, the inner water blocking tape longitudinally wraps the optical cable subunits and then enters an extruding machine, polypropylene materials enter the extruding machine to be extruded and molded on the inner water blocking tape to form a loose tube, and the loose tube is subjected to vacuum negative pressure treatment through a vacuum sizing water tank to achieve the set ovality;
5) after the loose tube is cooled and shaped by the first cooling water tank, the loose tube is dragged by the crawler and then enters the second cooling water tank for further cooling, and the loose tube is dragged by the take-up dancing wheel and then taken up on the wire spool for storage;
6) loose tube wrapping FRP strip: the loose tube is discharged from the winding frame, the water blocking yarn is attached to the loose tube, an FRP strip is wound outside the loose tube, the FRP strip is twisted outside the loose tube at a set pitch to form an armor layer, and an outer water blocking tape is wound outside the armor layer;
7) wrapping an aramid tape: wrapping an aramid tape on the outer water-blocking tape;
8) forming an outer sheath: and extruding an outer sheath layer outside the aramid fiber strip by an extruding machine, and forming the bulletproof optical cable in such a way.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
1) the bulletproof optical cable is designed in a layered mode, is reasonable in layout, the innermost optical cable subunit is suitable for being connected in a terminating mode, and then the inner water blocking tape, the loose tube, the water blocking yarn, the armor layer, the outer water blocking tape, the aramid tape and the outer protective sleeve are sequentially applied from inside to outside, the inner water blocking tape and the outer water blocking tape can enable the optical cable to have a double-layer water blocking effect, the outer armor FRP strip of the loose tube forms the armor layer, and meanwhile, the bulletproof optical cable can play a good rat-proof effect. Around the aramid fiber area outside the armor, the aramid fiber area can play fine shellproof effect, is the aramid fiber area around the package moreover, and this scheme is compared the aramid fiber area of weaving and can be improved production efficiency greatly. The optical cable has the characteristics of simple structure, light weight, small diameter, high optical fiber density, good tensile property, high production efficiency and the like.
2) The invention adopts polypropylene material to make the loose tube, so that the loose tube has good bending property and is convenient for coiling and retaining in the connector box.
3) The inner water blocking belt in the loose sleeve is provided with the sponge layer, so that the optical cable can play a good buffering role when being impacted, and the optical cable can be ensured to be safely used for a long time.
4) The subunit sheath is made of modified TPEE material, has good bending property and small diameter, can directly strip out the optical fiber without the help of tools, and is very convenient to construct.
5) The optical cable subunit of the invention is in an SZ twisted state in the loose sleeve, and no yarn is tied outside the loose sleeve, thus facilitating stripping and branching of the optical cable and facilitating construction. Moreover, when the loose tube is bent, the optical cable subunit has the twisting surplus length, so that the optical fiber is hardly subjected to the pressure/tensile stress generated by the length difference of the inner edge fiber and the outer edge fiber of the loose tube, and even if the optical fiber is hollow in the small loose tube, the optical fiber is not subjected to the pressure of the tube wall, so that the optical fiber is hardly influenced by macrobending and microbending, and the attenuation of the optical fiber is ensured to meet the requirement; the hollow space in the loose tube can be made very small, and the diameter of the loose tube can be made very small, so that the density of the fiber core in the loose tube can be increased, and the propagation capacity of optical signals can be effectively improved.
Drawings
Fig. 1 is a schematic view of a ballistic resistant fiber optic cable of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Referring to fig. 1, the bulletproof optical cable comprises an inner water blocking tape 3, an optical cable subunit, a loose tube 4, water blocking yarns 5, an armor layer, an outer water blocking tape 7, an aramid tape 8 and an outer sheath 9, wherein the optical cable subunit is suitable for terminating the optical cable, the optical cable subunit comprises a subunit sheath layer 2 and an optical fiber bundle arranged in the subunit sheath layer 2, the optical fiber bundle comprises a plurality of colored optical fibers 1, and a part of the colored optical fibers 1 are coated with water blocking paint. The number of cable subunits may be selected as desired, three cable subunits being shown. To ensure the water-tight performance of the cable subunits, some of the colored optical fibers 1 of each cable subunit are coated with a water-blocking coating. The material of subunit jacket layer 2 is preferably modified TPEE, and each cable subunit typically has 12 colored optical fibers 1.
The inner water blocking tape 3 longitudinally wraps the subunit jacket layer 2, the loose tube 4 is sleeved on the inner water blocking tape 3 through extrusion molding, and the loose tube 4 is made of polypropylene materials, so that the loose tube 4 is good in bending performance, and the loose tube 4 is convenient to coil in the joint box. And, the optical cable subunit is the SZ transposition state in loose tube 4 for optical cable subunit can have great excess length, and optic fibre hardly receives the pressure/tensile stress that the difference of loose tube 4 inside/outside edge fibre length produced, guarantees that optic fibre subsides consume and satisfies the requirement, can make the fibre core density of optical cable obtain promoting moreover.
The water-blocking yarns 5 are attached to the outer wall of the loose tube 4, the armor layer is made of Fiber Reinforced Plastic (FRP) with a fan-shaped annular cross section, the thickness of the FRP strip 6 can be determined according to the actual use environment, the FRP strip 6 with the specification of 3 × 1.0mm (width 3mm, thickness 1mm) is preferred, and the FRP strip 6 with the specification of 3 × 1.4mm (width 3mm, thickness 1.4mm) can be used if squirrel prevention is needed; the FRP strips 6 are spirally wound on the loose tube 4 according to a set pitch, and the FRP strips 6 can play a role in rat prevention after being wound, so that the tensile property of the optical cable is improved, and the shock resistance of the optical cable is improved. The FRP strip 6 wraps the loose tube 4 and also wraps the water blocking yarn 5, and in order to prevent water seepage of the optical cable, an outer water blocking tape 7 is wrapped outside the FRP strip 6. The aramid fiber belt 8 wraps the outer water-blocking belt 7, the aramid fiber belt 8 can play a good bulletproof role, the wrapped aramid fiber belt 8 serves as a bulletproof layer, the aramid fiber belt 8 is made of high-modulus aramid fiber and thermal resin, and the novel high-performance composite belt is formed. It has high intensity, and aramid fiber area 8 is tightly outside the armor that winds the package at FRP strip 6 formation, and when the optical cable received the bullet and assaulted, aramid fiber armor can play and block the bullet and kick into, and sponge water blocking tape buffering in addition in the optical cable simultaneously can the kinetic energy of effective absorption bullet, avoids the optical cable to receive the injury. Different from the common aramid woven belts, the composite structure is formed by an outer covering aramid belt and an FRP strip with a sector ring section to serve as an armor layer. Different from aramid woven belts which may leak impact force, the aramid woven belts are uniform and compact in texture, a high-toughness layer is formed on the surface of the FRP strip with the sector ring section, and the risk that optical fibers are damaged due to the fact that bullet impact force penetrates through an optical cable is reduced. Simultaneously aramid fiber takes inboard compound FRP strip, can be under the bullet impact outside under the condition in aramid fiber area, maintain the whole shape of optical cable, be unlikely to under the strong impact of bullet, cause local buckling to lead to the optical fiber damage, especially outer by aramid fiber area with compound with FRP strip around the form of package, under the winding in aramid fiber area, the FRP strip that has fan-shaped cross section compresses tightly each other, form the armor structure more firm for the FRP strip of circular cross section commonly used. According to the invention, on one hand, the shape characteristics of the aramid fiber belt and the FRP strip and the wrapping structure are utilized to form a more stable armor in structure, on the other hand, the compactness and toughness of the aramid fiber belt at the outer side and the tensile and compressive properties of the FRP strip at the inner side are utilized to resist bullet impact, so that the optical fiber damage possibly caused by bullet impact is reduced to a great extent, further, the internal sponge is filled, the kinetic energy brought by bullet shooting is absorbed, and the probability of damage to the optical fiber caused by bullet impact is further reduced.
The outer sheath 9 is sleeved on the aramid fiber belt 8 through extrusion molding. The outer sheath 9 is made of HDPE or MDPE material, the thickness is about 1.5mm-2mm, the material of the outer sheath 9 has the performance of resisting ultraviolet rays and protecting the optical cable, and the optical cable can run efficiently for a long time.
Further, the internal water blocking tape 3 comprises a water blocking non-woven fabric and a water blocking sponge layer attached to the water blocking non-woven fabric, the thickness of the water blocking sponge layer is generally 1mm-1.5mm, the water blocking sponge layer comprises a sponge layer and a water blocking material adhered to the surface of the sponge layer, the water blocking sponge layer is in contact with the optical cable subunit, and the water blocking non-woven fabric is in contact with the loose tube 4. The inner water blocking tape 3 integrates the functions of mechanical buffering and water blocking, and can effectively improve the bulletproof capability of the optical cable and prolong the service life of the optical cable.
Further, more than one water-blocking yarn 5 is firstly directly placed on the outer wall of the loose tube 4, and then more than one water-blocking yarn 5 is wound. The fiber main body of the water-blocking yarn 5 can be rapidly expanded to form a large-volume gelatinous substance when meeting water, and the gelatinous substance has quite strong water-retaining capacity and can effectively prevent the growth of water trees, thereby preventing the water from continuously permeating and diffusing and achieving the purpose of water blocking.
Furthermore, the subunit sheath layer 2 is made of modified TPEE material, so that the bending performance is good, the diameter is small, the optical fiber can be directly stripped without tools, and the construction is very convenient.
The production steps of the bulletproof optical cable are as follows:
1) and (3) coloring the optical fiber: the optical fiber is required to be colored and distinguished for convenient connection, the color of the optical fiber is generally colored according to the national standard full color spectrum, and the colored optical fiber is cured through a curing oven to form the colored optical fiber 1, so that the colored optical fiber 1 is ensured not to fade.
2) Coating a water-blocking paint on the colored optical fiber: in order to ensure the water seepage-proof performance of the optical cable subunit, a layer of water-blocking paint (no water-blocking paint is needed to be coated on the surfaces of some colored optical fibers 1, and enough space is ensured) needs to be coated on the surfaces of some colored optical fibers 1, and the optical cable subunit with 12 cores generally adopts the water-blocking paint coated on the 4 colored optical fibers 1, wherein the water-blocking paint is natural in color and about 4-5 um in thickness.
3) Producing an optical cable subunit: the material of the subunit sheath layer 2 is modified TPEE, the pay-off tension of the optical fiber bundle is generally 0.8-1.0N during production, the diameter of the optical cable subunit is generally 1.3mm, and the thickness of the modified TPEE is generally controlled to be 0.1-0.15 mm. Color master batches are required to be added for distinguishing during production. The loose tube 4 produced by using the modified TPEE material is easy to construct, and the subunit sheath layer 2 can be stripped by pinching with fingers, so that the construction is very convenient.
4) Dry loose tube 4 production of polypropylene material: paying off an optical cable subunit qualified in test on an optical fiber pay-off rack, enabling the optical cable subunit to pass through an SZ twisting table, enabling the SZ twisting table to be close to a machine head of a plastic extruding machine, enabling the optical cable subunit to be paid out from the optical fiber pay-off rack, enabling the optical cable subunit to enter a longitudinal packing machine after being twisted through the SZ twisting table (the SZ twisting table is provided with proper parameters to ensure that the optical cable subunit has a set extra length), enabling an internal water resistance band 3 to longitudinally wrap the optical cable subunit, enabling the internal water resistance band 3 to enter the machine head of the plastic extruding machine after longitudinally wrapping the optical cable subunit, enabling a polypropylene material to enter a vacuum sizing die after entering the plastic extruding machine for extrusion molding, enabling a loose tube 4 to pass through a vacuum sizing water tank, and enabling the loose tube 4 to have good ovality through vacuum negative pressure;
5) the loose sleeve 4 of extrusion molding is through track traction after first cooling trough cooling design, and loose sleeve 4 gets into the further cooling of second cooling trough once more, and the main region of pulling that gets into behind the supplementary traction wheel of loose sleeve 4 rethread, and loose sleeve 4 receives the line on the wire reel after receiving the dancing wheel. The invention adjusts the excess length of the optical cable subunit by adjusting the auxiliary traction tension of the auxiliary traction wheel and the take-up tension of the main traction. The proper extra length ensures the tensile property of the optical cable and the optical property of the optical fiber.
6) The loose tube 4 is wrapped with FRP strips 6: the loose tube 4 after the test is qualified is discharged from the wire spool, a water blocking yarn 5 with the specification of ZS5.0 (the linear density is 5000) is respectively and directly placed and wound on the loose tube 4, then a 3 x 1.0mm FRP strip 6 is wound outside the loose tube 4, the FRP strip 6 is twisted outside the loose tube 4 at a certain pitch to form an armor layer, an outer water blocking tape 7 is wound outside the twisted FRP strip 6, and the outer water blocking tape 7 cannot be overlapped when being wound.
7) Wrapping aramid fiber tape 8: the loose tube 4 with the FRP strips 6 wrapped and armored by the aramid fiber belt 8 is adopted, the wrapping tension is as large as possible, meanwhile, the aramid fiber belt 8 has a certain lap joint, and the bulletproof effect can be well played, so that the cable core of the optical cable is manufactured;
8) forming the outer sheath 9: and an outer sheath 9 is formed outside the cable core by extrusion molding through an extruding machine, the material of the outer sheath 9 adopts HDPE or MDPE, and the thickness of the outer sheath 9 is generally controlled to be 1.5mm-2.0 mm.
The production of the bulletproof optical cable is completed through the steps, the process is simple during the production of the optical cable with the structure, the structure is stable, the process parameters are easy to control, and the stability and the consistency of the performance of products are ensured.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. A bulletproof optical cable is characterized by comprising an inner water-blocking tape (3), an optical cable subunit, a loose tube (4), water-blocking yarns (5), an armor layer, an outer water-blocking tape (7), an aramid tape (8) and an outer sheath (9), the optical cable subunit comprises a subunit jacket layer (2) and an optical fiber bundle arranged in the subunit jacket layer (2), the inner water-resistant band (3) longitudinally wraps the subunit jacket layer (2), the loose tube (4) is sleeved on the inner water-resistant band (3) through extrusion molding, the water-blocking yarn (5) is attached to the outer wall of the loose tube (4), the armor layer adopts a plurality of FRP strips (6), the FRP strip (6) is twisted on the outer side of the loose tube (4) and also wraps the water-blocking yarn (5), the armor layer is wrapped around the outer water-blocking tape (7), and the aramid fiber tape (8) is wrapped around the outer water-blocking tape (7);
under the winding of aramid fiber belt (8) made of high modulus aramid fiber and thermal resin and uniform and dense in texture, FRP strips with sector annular sections are mutually compacted (6) and can maintain the overall shape of the bulletproof optical cable under the impact of bullets under the condition of being covered by the aramid fiber belt (8) so as not to cause optical fiber damage due to local bending under the strong impact of the bullets, and the outer sheath (9) is sleeved on the aramid fiber belt (8) through extrusion molding;
the internal water blocking belt (3) comprises a water blocking non-woven fabric and a water blocking sponge layer attached to the water blocking non-woven fabric, the water blocking sponge layer comprises a sponge layer and a water blocking material adhered to the surface of the sponge layer, so that the bulletproof optical cable has a buffering effect when impacted, the water blocking sponge layer is in contact with the optical cable subunit, and the water blocking non-woven fabric is in contact with the loose tube (4).
2. A ballistic-resistant optical cable according to claim 1, characterized in that more than one water-blocking yarn (5) is placed directly on the outer wall of said loose tube (4) and then more than one water-blocking yarn (5) is wrapped.
3. A ballistic-resistant optical cable according to claim 1, characterized in that said bundle comprises a plurality of colored optical fibers (1), wherein a portion of said colored optical fibers (1) are coated with a water-blocking coating.
4. A ballistic resistant optical cable according to claim 1, characterized in that said subunit jacket layer (2) is of modified TPEE material.
5. Ballistic resistant optical cable according to claim 1, characterized in that the optical cable subunits are in an SZ stranded state inside the loose tube (4).
6. A ballistic-resistant optical cable according to claim 1, characterized in that said FRP strip (6) is spirally wrapped around said loose tube (4) at a set pitch.
7. A ballistic-resistant optical cable according to claim 1, characterized in that said outer sheath (9) is made of HDPE or MDPE material.
8. A ballistic-resistant optical cable according to claim 1, characterized in that said loose tube (4) is made of polypropylene material.
9. The process for preparing a ballistic resistant optical cable according to any one of claims 1 to 8, characterized in that it comprises the following steps:
1) and (3) coloring the optical fiber: coloring the optical fiber according to the national standard full chromatogram, and curing the colored optical fiber through a curing furnace to form a colored optical fiber;
2) coating a water-blocking paint on the colored optical fiber: the surfaces of some colored optical fibers (1) are coated with a layer of water-blocking paint, and the water-blocking paint is natural in color;
3) producing an optical cable subunit: the modified TPEE material is extruded to form a subunit sheath layer (2) which is sleeved on an optical fiber bundle consisting of a plurality of optical fibers, and the subunit sheath layer (2) and the optical fiber bundle together form an optical cable subunit;
4) producing the loose tube (4): the optical cable subunits are paid off on an optical fiber pay-off rack, a plurality of optical cable subunits are stranded together on an SZ stranding table and then enter a longitudinal packing machine, the optical cable subunits are longitudinally packed by the inner water blocking tape (3) and then enter an extruding machine, a polypropylene material is extruded and molded on the inner water blocking tape (3) through the extruding machine to form a loose tube (4), and the loose tube (4) is subjected to vacuum negative pressure treatment through a vacuum sizing water tank to enable the loose tube (4) to reach a set ellipticity;
5) after the loose tube (4) is cooled and shaped by the first cooling water tank, the loose tube is dragged by the crawler and then enters the second cooling water tank for further cooling, and the loose tube (4) is dragged by the take-up dancing wheel to be taken up on the wire spool for storage;
6) the loose tube (4) is wrapped with FRP strips (6): the loose tube (4) is discharged from the winding frame, the water blocking yarn (5) is attached to the loose tube (4), the FRP strip (6) is wrapped outside the loose tube (4), the FRP strip (6) is twisted outside the loose tube (4) at a set pitch to form an armor layer, and the outer water blocking tape (7) is wrapped outside the armor layer;
7) wrapping aramid tapes (8): wrapping an aramid tape (8) on the outer water-blocking tape (7);
8) shaped outer sheath (9): an outer sheath (9) is extruded outside the aramid tape (8) by means of an extruder, in such a way that a complete ballistic-resistant cable is formed.
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| CN112363286A (en) * | 2020-11-11 | 2021-02-12 | 江苏亨通光电股份有限公司 | Nonmetal armored three-sheath self-supporting rat-proof optical cable and preparation process thereof |
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