CN110764207A - Novel water-blocking full-dry optical cable structure and preparation method thereof - Google Patents

Abstract

The invention provides a novel water-blocking full-dry optical cable structure and a preparation method thereof, relating to the technical field of communication optical cables and comprising a loose tube and optical fibers arranged in the loose tube; the outer surface of the optical fiber is coated with a water-blocking coating, the water-blocking coating expands with water to form a filler, the filler is filled in the loose tube, and the filler is used for preventing the optical fiber from contacting with water; the water-blocking coating can expand in water to form a filler, and the filler can prevent water vapor from further permeating into the loose tube; on the one hand, the water blocking function is realized, the optical fiber is prevented from being corroded by water vapor, on the other hand, the space occupied by the water blocking coating is small compared with the water blocking material filled in the traditional mode, the diameter of the loose tube can be further compressed, the volume of the optical cable can be further reduced, and the miniaturization requirement of the optical cable is met.

Description

Novel water-blocking full-dry optical cable structure and preparation method thereof

Technical Field

The invention relates to the technical field of communication optical cables, in particular to a full-dry optical cable structure with a novel water blocking mode and a preparation method thereof.

Background

With the development of communication technology, higher requirements are also put forward on the performance, the volume and the like of the optical cable; at present, a miniature optical cable with smaller volume and higher density gradually becomes a key research object, and meanwhile, the optical cable also needs to ensure that the performances such as water resistance and the like cannot be reduced.

The existing full-dry optical cable is mainly used for blocking water by filling a loose tube with a water blocking substance, such as a plurality of water blocking yarns or water blocking powder, so as to prevent water vapor from permeating into the loose tube.

However, the space occupied by the water-blocking material filled in the loose tube of the existing optical cable is large, which limits the diameter of the loose tube to be smaller, so that the diameter of the existing optical cable is larger, which is not beneficial to the miniaturization of the optical cable.

The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art that is known to a person skilled in the art.

Disclosure of Invention

The invention aims to provide a novel water-blocking full-dry optical cable structure and a preparation method thereof, so as to solve the technical problems that a water-blocking substance filled in a loose tube of the existing optical cable occupies a large space and is not beneficial to the miniaturization of the optical cable.

In order to solve the technical problems, the technical scheme provided by the invention is as follows:

the invention provides a novel water-blocking full-dry optical cable structure, which comprises a loose tube and an optical fiber arranged in the loose tube;

the outer surface of the optical fiber is coated with a water-blocking coating, the water-blocking coating expands with water to form a filler, the filler is filled in the loose tube, and the filler is used for preventing the optical fiber from contacting with water.

Further, the anti-skid device further comprises a first outer sheath and a tensile element layer;

the first outer sheath is sleeved outside the loose tube, and the tensile element layer is sleeved between the first outer sheath and the loose tube.

Furthermore, a reinforcing single body is embedded in the first outer sheath, and the reinforcing single body extends along the length direction of the first outer sheath.

Further, the cable also comprises a second outer sheath, a first central reinforcing piece and a first water blocking yarn;

the first central reinforcing piece and the first water blocking yarn are both arranged in the second outer sheath, and both the first central reinforcing piece and the first water blocking yarn extend along the length direction of the second outer sheath;

the loose tube is arranged in the second outer sheath, and the loose tubes are sequentially arranged around the first central reinforcing piece.

Further, the waterproof layer and the glass fiber layer are also included;

the waterproof layer and the glass fiber layer are arranged between the loose tube and the second outer sheath, and the waterproof layer and the glass fiber layer are sequentially arranged from inside to outside.

Further, the packaging bag also comprises a filling rope and a first tearing rope;

the first tearing rope is embedded in the second outer sheath and extends along the length direction of the second outer sheath;

the filler cord is disposed within the second outer jacket and is positioned on one side of the first central stiffener.

Further, the outer sheath comprises a third outer sheath, a second central reinforcing piece and a cushion layer;

the second central reinforcing piece and the extruded cushion layer are both arranged in the third outer sheath, and the extruded cushion layer is coated outside the second central reinforcing piece;

the loose tubes are arranged between the third outer sheath and the extrusion cushion layer, and the loose tubes are sequentially arranged around the extrusion cushion layer.

Further, the device also comprises a second tearing rope and a second water-blocking yarn;

the second tearing rope and the second water-blocking yarn are arranged in the third outer sheath, and the second tearing rope and the second water-blocking yarn extend along the length direction of the third outer sheath.

Further, the water-blocking coating is made of a composite material, and the composite material comprises acrylic acid, sodium acrylate and dipropylene glycol diacrylate.

Further, the invention provides a preparation method of a full-dry optical cable structure with a novel water blocking mode, which comprises the following steps:

coloring the optical fiber, namely coating the ink on the surface of the optical fiber by a coloring machine;

coating a water-blocking paint, and coating the water-blocking paint on the surface layer of the colored optical fiber by a coloring machine;

curing the water-blocking coating, namely introducing nitrogen into a curing furnace to form an oxygen-free environment, so that the optical fiber coated with the water-blocking coating passes through the curing furnace along the length direction of the optical fiber, and curing the water-blocking coating by a curing lamp in the curing furnace;

plastic sheathing, namely, extruding and molding the extrusion molding raw material outside the optical fiber subjected to the solidification of the water-blocking coating through an extrusion molding die of an extruding machine to form a loose tube, and meanwhile, introducing dry gas between the loose tube and the optical fiber;

forming the cable core, placing the loose tube and the filling rope around the central reinforcement, and covering the waterproof layer outside the loose tube and the filling rope to form the cable core;

and (4) outer sheath forming, wherein the extrusion molding material is extruded and formed outside the cable core through an extruding machine to form the outer sheath.

By combining the technical scheme, the invention has the beneficial effects that:

the invention provides a novel water-blocking full-dry optical cable structure, which comprises a loose tube and an optical fiber arranged in the loose tube; the outer surface of the optical fiber is coated with a water-blocking coating, the water-blocking coating expands with water to form a filler, the filler is filled in the loose tube, and the filler is used for preventing the optical fiber from contacting with water.

The water-blocking coating can expand in water to form a filler, and the filler can prevent water vapor from further permeating into the loose tube; on the one hand, the water blocking function is realized, the optical fiber is prevented from being corroded by water vapor, on the other hand, the space occupied by the water blocking coating is small compared with the water blocking material filled in the traditional mode, the diameter of the loose tube can be further compressed, the volume of the optical cable can be further reduced, and the miniaturization requirement of the optical cable is met.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic structural diagram of a full-dry optical cable structure with a novel water blocking mode according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a full-dry optical cable structure in a novel water blocking manner according to an embodiment of the present invention in other embodiments;

fig. 3 is a schematic structural diagram of a full-dry optical cable structure in a novel water blocking manner according to an embodiment of the present invention in another embodiment;

fig. 4 is a process flow diagram of a method for manufacturing a full-dry optical cable structure with a novel water blocking mode according to an embodiment of the present invention.

Icon: 100-loose tubes; 200-an optical fiber; 300-a first outer sheath; 301-a second outer sheath; 302-a third outer sheath; 310-a tensile element layer; 320-a reinforcing monomer; 400-a first central stiffener; 401-a second central stiffener; 410-a first water-blocking yarn; 411-a second water-blocking yarn; 420-a water resistant layer; 430-a glass fiber layer; 440-a filler rope; 450-a first rip cord; 451-a second rip cord; 500-cushion layer extrusion.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that, as the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, their indicated orientations or positional relationships are based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" as appearing herein are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" should be interpreted broadly, e.g., as a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1, the present embodiment provides a novel water-blocking full-dry optical cable structure, which includes aloose tube 100 and anoptical fiber 200 disposed in theloose tube 100; the outer surface of theoptical fiber 200 is coated with a water blocking coating which swells with water to form a filler filled in theloose tube 100, the filler serving to prevent theoptical fiber 200 from contacting water.

Specifically, theloose tube 100 can be formed by extrusion molding of materials such as polybutylene terephthalate, polypropylene or polycarbonate, theloose tube 100 is sleeved outside theoptical fibers 200, theoptical fibers 200 are arranged in a plurality of pieces, and theoptical fibers 200 are arranged in parallel; the outer surface of eachoptical fiber 200 is coated with a water-blocking coating, the water-blocking coating is made of water-soluble substances, the water-blocking coating can rapidly expand when meeting water to form hydrogel fillers, and the hydrogel fillers prevent water vapor from further penetrating into the surface of theoptical fibers 200.

Theloose tube 100 does not need to be filled with water-blocking yarns or water-blocking powder, so that on one hand, the space occupied by the water-blocking coating is small, and the diameter of theloose tube 100 can be small; on the other hand, the problem that the outer diameter of the conventional dryloose tube 100 is fluctuated due to the fact that water-blocking yarns jump or water-blocking powder is accumulated to cause blockage of an extrusion molding die in the processing process of the conventional dryloose tube 100 can be effectively solved, and production waste caused by breakage of the water-blocking yarns in the production process can be avoided. The design of arranging a plurality ofoptical fibers 200 with water-blocking coatings on the surface layers in theloose tube 100 has the advantages that compared with theloose tube 100 containing water-blocking yarns or water-blocking powder, the plastic-sleeving processing performance of theloose tube 100 is better, and the structural design of theloose tube 100 with smaller size can be met, so that the overall size of the optical cable can be further reduced, and the density of theoptical fibers 200 is improved.

In the fully dry optical cable structure with the novel water blocking mode provided by this embodiment, the water blocking coating can expand in the presence of water to form a filler, and the filler can prevent water vapor from further permeating into theloose tube 100; on one hand, the water blocking of theoptical fiber 200 is realized, on the other hand, the space occupied by the water blocking coating is small compared with the traditional filled water blocking substance, the diameter of theloose tube 100 can be further compressed, the volume of the optical cable can be further reduced, and the miniaturization requirement of the optical cable is met.

On the basis of the above embodiments, as shown in fig. 1, the structure of the novel water-blocking fully-dry optical cable further includes a first outer sheath 300 and a tensile element layer 310; the first outer sheath 300 is sleeved outside theloose tube 100, and the tensile element layer 310 is sleeved between the first outer sheath and theloose tube 100.

Specifically, the first outer sheath 300 may be a sleeve formed by extrusion molding of polyethylene or nylon, the tensile element layer 310 may be an aramid layer or a glass fiber layer, preferably, the tensile element layer 310 is an aramid layer, and the tensile element layer 310 is used to improve the tensile strength of the optical cable; the tensile element layer 310 is sleeved outside theloose tube 100, and the outer sheath is sleeved outside the tensile element layer 310.

Further, a reinforcing single body 320 is embedded in the first outer sheath 300, and the reinforcing single body 320 extends along the length direction of the first outer sheath 300.

Specifically, the reinforcing single bodies 320 may be configured as reinforcing ropes or composite material fillers, preferably, the reinforcing single bodies 320 are configured as reinforcing cores formed by extrusion molding of fiber reinforced composite materials, the reinforcing single bodies 320 may be configured in multiple numbers, the multiple reinforcing single bodies 320 are all embedded into the first outer sheath 300, axes of the multiple reinforcing single bodies 320 are all parallel to an axis of the first outer sheath 300, and the reinforcing single bodies 320 and the first outer sheath 300 are configured in equal length.

In the structure of the novel water-blocking fully-dry optical cable provided by this embodiment, theloose tube 100, the tensile element layer 310 and the first outer sheath 300 are sequentially arranged from inside to outside to form the fully-dry optical cable with a central tube structure according to this embodiment, and the reinforcing unit 320 embedded in the first outer sheath 300 further improves the tensile strength of the optical cable; the whole structure is simple, the volume is small, and the density of theoptical fiber 200 is high.

On the basis of the above embodiment, as shown in fig. 2, the fully dry optical cable structure with the novel water blocking mode provided in this embodiment further includes a secondouter sheath 301, a firstcentral strength member 400, and a firstwater blocking yarn 410; the firstcentral reinforcing member 400 and the firstwater blocking yarns 410 are both arranged in the secondouter sheath 301, and the first central reinforcingmember 400 and the firstwater blocking yarns 410 both extend along the length direction of the secondouter sheath 301; theloose tubes 100 are disposed in the secondouter sheath 301, and a plurality ofloose tubes 100 are sequentially disposed around the first central reinforcingmember 400.

Specifically, the secondouter sheath 301 in this embodiment and the first outer sheath 300 in the above embodiments are all configured to have the same material and structure, and the secondouter sheath 301 is sleeved outside theloose tube 100, the first central reinforcingmember 400 and the firstwater blocking yarn 410; the firstcentral reinforcement 400 is disposed at a central axis position of the secondouter sheath 301, the firstcentral reinforcement 400 and the secondouter sheath 301 are disposed in parallel, the firstcentral reinforcement 400 is disposed as a reinforcing structure made of a fiber reinforced composite material, and the firstcentral reinforcement 400 and the secondouter sheath 301 are disposed as equal lengths; theloose tube 100 may be provided in plurality, the plurality ofloose tubes 100 being disposed between the first central reinforcingmember 400 and the secondouter sheath 301, the plurality ofloose tubes 100 being sequentially disposed around the first central reinforcingmember 400; the first water-blockingyarn 410 is disposed on one side of the first central reinforcingmember 400, and preferably, the first water-blockingyarn 410 is disposed adjacent to the first central reinforcingmember 400, and the first water-blockingyarn 410 may be disposed as one or more yarns.

Further, thewaterproof layer 420 and theglass fiber layer 430 are also included; the water-resistant layer 420 and theglass fiber layer 430 are both arranged between theloose tube 100 and the secondouter sheath 301, and the water-resistant layer 420 and theglass fiber layer 430 are arranged in sequence from inside to outside.

Specifically, thewater blocking layer 420 may be set as a water blocking tape, the water blocking tape covers the firstcentral reinforcement 400, theloose tube 100 and the firstwater blocking yarn 410, theglass fiber layer 430 is sleeved outside thewater blocking layer 420, and the secondouter sheath 301 is sleeved outside theglass fiber layer 430; the water-blocking layer 420 can further improve the water-blocking effect of the optical cable, theglass fiber layer 430 is used for bearing force and has good heat insulation and heat preservation performance, the tensile strength of the optical cable is improved, the optical cable can be normally used in extremely cold or extremely hot environments, when the optical cable is bitten by animals, glass residues can damage the oral cavity of the animals, and the optical cable can be prevented from being damaged by the animals such as rats.

Further, a fillingrope 440 and afirst tearing rope 450 are also included; thefirst tear string 450 is embedded in the secondouter sheath 301 and extends along the length direction of the secondouter sheath 301; thefiller rope 440 is disposed within the secondouter sheath 301 and on one side of the firstcentral strength member 400.

Specifically, the fillingrope 440 plays a role of filling and supplementing a position, and on the other hand, the tensile strength of the optical cable can be improved, the fillingrope 440 can be a rope-shaped element made of polyethylene terephthalate, the diameter of the fillingrope 440 is preferably set to be equal to that of theloose tube 100, and the fillingrope 440 and theloose tube 100 form an annular structure and are arranged around the first central reinforcingmember 400; the first tearingrope 450 is arranged to be nylon or nylon rope, the first tearingrope 450 is embedded into the secondouter sheath 301, the first tearingrope 450 and the secondouter sheath 301 are arranged in parallel, the first tearingrope 450 and the secondouter sheath 301 are arranged to be equal in length, on one hand, the tensile strength of the secondouter sheath 301 is enhanced by the first tearingrope 450, on the other hand, a tearing opening is formed in the secondouter sheath 301 by tearing the first tearingrope 450, and stripping of the secondouter sheath 301 is facilitated.

The novel full-dry optical cable structure adopting the water blocking mode provided by the embodiment is sequentially arranged from outside to inside through the secondouter sheath 301, theglass fiber layer 430 and thewater blocking layer 420, and thewater blocking layer 420 is internally coated with theloose tube 100, the fillingrope 440, the firstwater blocking yarn 410 and the first central reinforcingmember 400, so that the full-dry optical cable with the layer-stranding structure is formed.

On the basis of the above embodiments, as shown in fig. 3, the structure of the novel water-blocking fully-dry optical cable further includes a thirdouter sheath 302, a secondcentral strength member 401, and amat layer 500; the secondcentral stiffener 401 and thebedding layer 500 are both disposed within the thirdouter jacket 302, and thebedding layer 500 is wrapped outside the secondcentral stiffener 401; theloose tube 100 is disposed between the thirdouter sheath 302 and thecushion layer 500, and theloose tubes 100 are sequentially disposed around thecushion layer 500.

Specifically, the thirdouter jacket 302 in the present embodiment is the same as the first outer jacket 300 and the secondouter jacket 301 in the above embodiments, and the second central reinforcingmember 401 in the present embodiment is the same as the first central reinforcingmember 400 in the above embodiments; theextrusion cushion layer 500 is preferably made of polyethylene materials, theextrusion cushion layer 500 is sleeved outside the second central reinforcingpart 401, theextrusion cushion layer 500 has good buffering and pressure reducing effects on theloose tube 100, and the stability of the overall structure of the cable core is guaranteed.

Further, asecond tearing rope 451 and a second water-blockingyarn 411 are also included; thesecond tearing rope 451 and the secondwater blocking yarn 411 are both arranged in the thirdouter sheath 302, and both thesecond tearing rope 451 and the secondwater blocking yarn 411 extend along the length direction of the thirdouter sheath 302.

Specifically, thesecond tearing rope 451 in the present embodiment and the first tearingrope 450 in the above embodiment are configured to be the same, the secondwater blocking yarn 411 in the present embodiment and the firstwater blocking yarn 410 in the above embodiment are configured to be the same, both thesecond tearing rope 451 and the secondwater blocking yarn 411 are configured to be parallel to the thirdouter sheath 302, and both the length of thesecond tearing rope 451 and the length of the secondwater blocking yarn 411 are configured to be equal to the length of the thirdouter sheath 302; preferably, thesecond tearing string 451 is disposed adjacent to the inner wall of the thirdouter sheath 302, and thesecond tearing string 451 can improve the tensile strength of the optical cable and facilitate the formation of a tear on the thirdouter sheath 302 by tearing thesecond tearing string 451.

Further, the water-blocking coating is made of a composite material, and the composite material comprises acrylic acid, sodium acrylate and dipropylene glycol diacrylate.

Specifically, the composite material includes acrylic acid, sodium acrylate and dipropylene glycol diacrylate, but is not limited to other materials, acrylic acid, sodium acrylate and dipropylene glycol diacrylate are used as raw materials to form a water-soluble liquid coating with a slight acidic odor, the liquid coating is cured on theoptical fiber 200 to form a water-blocking coating, and the water-blocking coating has a slight faint rose odor. The water-blocking paint with different expansion coefficients can be formed by setting the acrylic acid, the sodium acrylate and the dipropylene glycol diacrylate into different proportions.

The novel full-dry optical cable structure adopting the water blocking mode provided by the embodiment is characterized in that the secondcentral reinforcement part 401, thecushion extrusion layer 500, theloose tube 100 and the thirdouter sheath 302 are sequentially arranged from inside to outside, and thesecond tearing rope 451 and the secondwater blocking yarn 411 are arranged between thecushion extrusion layer 500 and the thirdouter sheath 302, so that the full-dry air-blowing micro optical cable with light weight, small size and highoptical fiber 200 density is formed, and the related requirements of CPR standards can be met.

On the basis of the foregoing embodiment, further, the method for manufacturing a full-dry optical cable structure with a novel water blocking method according to this embodiment, as shown in fig. 4, includes: coloring the optical fiber 200, and coating ink on the surface of the optical fiber 200 by a coloring machine; coating a water-blocking paint, and coating the water-blocking paint on the surface layer of the optical fiber 200 which is colored by a coloring machine; curing the water-blocking coating, namely introducing nitrogen into a curing furnace to form an oxygen-free environment, so that the optical fiber 200 coated with the water-blocking coating passes through the curing furnace along the length direction of the optical fiber, and the water-blocking coating is cured by a curing lamp in the curing furnace; plastic sheathing, namely, extruding and molding the extrusion molding raw materials outside the optical fiber 200 subjected to the solidification of the water-blocking coating through an extrusion molding die of an extruding machine to form a loose tube 100, and meanwhile, introducing dry gas between the loose tube 100 and the optical fiber 200; the cable core is molded, so that the loose tube 100 and the filling rope 440 are placed around the central reinforcing member, and the water blocking layer 420 is coated outside the loose tube 100 and the filling rope 440 to form the cable core; and (4) outer sheath forming, wherein the extrusion molding material is extruded and formed outside the cable core through an extruding machine to form the outer sheath.

Specifically, a plurality ofoptical fibers 200 are coated with different colors respectively by a coloring machine so as to identify theoptical fibers 200 with different functions; the coating of the water-blocking coating is finished by using a coloring machine, and the thickness uniformity of the coating is good; through leading into nitrogen gas to curing oven, form anaerobic environment, avoid the coating that blocks water to be oxidized and drop fromoptic fibre 200, the photocuring mode of curing lamp is now to traditional thermosetting form, and going on of the solidification reaction of easier control can satisfy each item technical requirement of solidification through the luminous power of control curing lamp. The loose tube 100 is preferably made of polyethylene terephthalate, the raw materials are extruded and molded outside the optical fiber 200 by an extruder, during the extrusion molding of the loose tube 100, a stable dry gas is injected into the loose tube 100 by an air pressure needle tube at the front part of the handpiece of the extruder through an air pressure stabilizing device so as to ensure the outer diameter and the roundness of the loose tube 100, and the optical fiber 200 can shake to a certain extent by air flow, so that the optical fiber 200 is prevented from being stuck together due to long-time contact with the inner wall of the loose tube 100; in the cable core forming process, the loose tube 100 and the filling rope 440 are placed around the central reinforcing member, which may be the first central reinforcing member 400 in the above-described embodiment; the outer sheath is made of polyethylene, polyethylene raw materials are extruded and molded outside the cable core through an extrusion molding die of an extruding machine to form the outer sheath, the outer sheath can represent a first outer sheath 300, a second outer sheath 301 and a third outer sheath 302, and the full-dry optical cable with the central tube type structure, the full-dry optical cable with the layer-stranding structure and the full-dry air-blowing optical cable provided in the embodiment can be prepared through properly adjusting the sequence of the working procedures or adding additional conventional working procedure steps.

The optical cable manufactured by the preparation method of the full-dry optical cable provided by the embodiment has a good lightning protection effect due to the full-dry optical cable; the traditional powdery water-absorbing material is abandoned, so that the environment is protected; the diameter of theloose tube 100 is further reduced, the volume and the quality of the optical cable are reduced, the optical cable is more convenient to carry and lay, and the construction difficulty is reduced; theoptical fiber 200 has high density and high miniaturization degree, and can meet the related standards of the CPR of the foreign optical cable.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. The utility model provides a full dry-type optical cable structure of novel mode of blocking water which characterized in that includes: a loose tube (100) and an optical fiber (200) disposed within the loose tube (100);

the outer surface of the optical fiber (200) is coated with a water-blocking coating which swells in the presence of water to form a filler, the filler is filled in the loose tube (100), and the filler is used for preventing the optical fiber (200) from contacting water.

2. A novel water-blocking fully dry fiber optic cable construction as claimed in claim 1 further comprising a first outer jacket (300) and a tensile element layer (310);

the first outer sheath (300) is sleeved outside the loose tube (100), and the tensile element layer (310) is sleeved between the first outer sheath (300) and the loose tube (100).

3. The novel water-blocking full-dry optical cable structure according to claim 2, wherein a single reinforcing body (320) is embedded in the first outer sheath (300), and the single reinforcing body (320) extends along the length direction of the first outer sheath (300).

4. A novel water-blocking fully dry optical cable construction as claimed in claim 1 further comprising a second outer jacket (301), a first central strength member (400) and a first water-blocking yarn (410);

the first central stiffener (400) and the first water-blocking yarn (410) are both disposed within the second outer sheath (301), the first central stiffener (400) and the first water-blocking yarn (410) both extending along a length direction of the second outer sheath (301);

the loose tubes (100) are arranged in the second outer sheath (301), and a plurality of the loose tubes (100) are arranged in sequence around the first central reinforcing member (400).

5. A novel water-blocking fully dry optical cable structure as claimed in claim 4 further comprising a water-blocking layer (420) and a fiberglass layer (430);

the waterproof layer (420) and the glass fiber layer (430) are arranged between the loose tube (100) and the second outer sheath (301), and the waterproof layer (420) and the glass fiber layer (430) are sequentially arranged from inside to outside.

6. A novel water-blocking fully dry fiber optic cable construction as claimed in claim 5 further comprising a filler cord (440) and a first ripcord (450);

the first tearing rope (450) is embedded in the second outer sheath (301) and extends along the length direction of the second outer sheath (301);

the filler rope (440) is disposed within the second outer jacket (301) and on one side of the first central stiffener (400).

7. A novel water-blocking fully dry fiber optic cable construction as claimed in claim 1 further comprising a third outer jacket (302), a second central strength member (401) and a crush pad (500);

the second central stiffener (401) and the bedding layer (500) are both arranged inside the third outer sheath (302), the bedding layer (500) is coated outside the second central stiffener (401);

the loose tube (100) is arranged between the third outer sheath (302) and the cushion layer (500), and the loose tubes (100) are sequentially arranged around the cushion layer (500).

8. A novel water-blocking fully dry optical cable structure as claimed in claim 7, further comprising a second ripcord (451) and a second water-blocking yarn (411);

the second tearing rope (451) and the second water-blocking yarn (411) are both arranged in the third outer sheath (302), and the second tearing rope (451) and the second water-blocking yarn (411) both extend along the length direction of the third outer sheath (302).

9. A novel water-blocking fully dry fiber optic cable construction as claimed in claim 1 wherein said water-blocking coating is made of a composite material comprising acrylic acid, sodium acrylate and dipropylene glycol diacrylate.

10. A preparation method of a novel water-blocking full-dry optical cable structure is characterized by comprising the following steps:

coloring the optical fiber (200), and coating ink on the surface of the optical fiber (200) by a coloring machine;

coating a water-blocking paint, and coating the water-blocking paint on the surface layer of the colored optical fiber (200) by a coloring machine;

curing the water-blocking coating, introducing nitrogen into the curing oven to form an oxygen-free environment, so that the optical fiber (200) coated with the water-blocking coating passes through the curing oven along the length direction of the optical fiber, and curing the water-blocking coating by a curing lamp in the curing oven;

plastic sheathing, namely, extruding and molding the extrusion molding raw material outside the optical fiber (200) subjected to the solidification of the water-blocking coating through an extrusion molding die of an extruding machine to form a loose tube (100), and meanwhile, introducing dry gas between the loose tube (100) and the optical fiber (200);

the cable core is molded, the loose tube (100) and the filling rope (440) are placed around the central reinforcing piece, and the waterproof layer (420) is coated outside the loose tube (100) and the filling rope (440) to form the cable core;

and (4) outer sheath forming, wherein the extrusion molding material is extruded and formed outside the cable core through an extruding machine to form the outer sheath.

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