CN117406360A - Adsorption type flame-retardant access optical cable and manufacturing method thereof - Google Patents

Abstract

The application relates to an adsorption type flame-retardant access optical cable and a manufacturing method thereof, wherein a sealed accommodating space and a plurality of reinforcing pieces are arranged in a flame-retardant outer sheath, and the bottom of the flame-retardant outer sheath is provided with a horizontal plane; the outer periphery of the cross section of the flame-retardant outer sheath is arc-shaped; the plurality of reinforcing pieces are positioned at the periphery of the sealed accommodating space; the optical fiber belt is arranged in the sealed accommodating space and is wrapped with a water blocking belt; the adsorption piece is connected to the horizontal plane and is provided with a plurality of adsorption cavities. The optical cable is attached to the wall surface or the ground through the absorption part, the reinforcing parts are uniformly dispersed and added around the optical fiber ribbon, and the gravity dispersion is relatively uniform, so that the optical cable is not easily affected by the windy weather or the rotating bending of the optical cable during the construction. The use of fine cream in the replacement conventional optical cable of waterstop can be in cancelling non-fire-retardant materials such as sleeve pipe, fine cream, oleamen through the above setting, and does not influence the bending resistance and the shock attenuation performance of optical cable to the area of contact fire when meetting the conflagration has been reduced, the effect of physical separation conflagration to the optical fiber communication influence is played.

Description

Adsorption type flame-retardant access optical cable and manufacturing method thereof

Technical Field

The present disclosure relates to optical communication cables and methods for manufacturing the same, and more particularly to an adsorption type flame retardant access optical cable and a method for manufacturing the same.

Background

The indoor and outdoor access optical cable needs to have excellent flame retardant property, so that the harm of fire to human and property is reduced. The excellent indoor and outdoor optical cables for the access network can enable information data transmission between indoor and outdoor to be quicker and more stable, provide an efficient and safe communication network for cities, and better meet the demands of people for information and data transmission.

The design of the flame-retardant access optical cable mainly improves the flame-retardant performance of the optical cable by using various excellent flame-retardant sheaths, and meanwhile, non-flame-retardant materials such as sleeves, fiber pastes, ointments and the like in the optical cable can influence the flame-retardant performance of the whole optical cable. In particular, in the event of a fire, these materials may cause brittle fracture of the cable or may cause failure or distortion of the cable transmission signal due to differential expansion coefficients, thermal expansion in the event of a fire, and uneven cooling shrinkage after fire extinguishing. The design of the flame retardant cable is a compromise.

Disclosure of Invention

The embodiment of the application provides an adsorption type flame-retardant access optical cable and a manufacturing method thereof, which are used for solving the problems that non-flame-retardant materials such as a sleeve, fiber paste, ointment and the like in the optical cable in the related technology also influence the flame retardant performance of the whole optical cable, and the thermal expansion of the optical cable is easy to cause the failure or distortion of optical cable transmission signals in the case of fire.

In a first aspect, there is provided an adsorptive flame retardant access cable comprising:

the flame-retardant outer sheath is internally provided with a sealed accommodating space and a plurality of reinforcing pieces, and the bottom of the flame-retardant outer sheath is provided with a horizontal plane; the outer periphery of the cross section of the flame-retardant outer sheath is arc-shaped; a plurality of reinforcement members are positioned at the periphery of the sealed accommodating space;

the optical fiber ribbon is arranged in the sealed accommodating space, and the outside of the optical fiber ribbon is wrapped with a water blocking ribbon;

the adsorption piece is connected to the horizontal plane, and the bottom surface of the adsorption piece is provided with a plurality of adsorption cavities.

In some embodiments, the plurality of stiffeners are distributed along an arcuate path that is concentric with the arcuate arc.

In some embodiments, the plurality of stiffeners includes two metal stiffeners and two FRP stiffeners; the two metal reinforcing pieces are positioned above the sealed accommodating space; the two FRP reinforcement members are located on both sides of the seal accommodating space in the width direction of the horizontal plane.

In some embodiments, the top surface of the adsorbent member has the same shape and area as the horizontal surface; the adsorption piece is made of rubber materials; or alternatively, the first and second heat exchangers may be,

the adsorption piece comprises a plurality of sections of strip-shaped parts which are distributed at intervals along the length direction of the flame-retardant outer sheath, and each section of strip-shaped part is made of rubber materials.

In some embodiments, the cross section of the absorbing member is zigzag, the zigzag at the bottom of the absorbing member is distributed at intervals along the width direction of the horizontal plane, and each zigzag extends along the length direction of the flame-retardant outer sheath; and the adsorption cavity is formed between two adjacent sawteeth.

In some embodiments, the optical fiber ribbon includes a plurality of light units, each light unit including, in order from the outside to the inside, a flame retardant inner jacket, an aramid yarn layer, and an optical fiber.

In some embodiments, the flame retardant inner sheath and the flame retardant outer sheath are both made of a high flame retardant sheath material; the high flame retardant sheath material comprises: 45-50 parts by mass of high-density polyethylene, 45-50 parts by mass of magnesium hydroxide flame retardant, 2-3 parts by mass of montmorillonite flame retardant, 5-7 parts by mass of carbonizing agent, 1-5 parts by mass of plasticizer, 0.05-0.1 part by mass of phenolic antioxidant 1010,0.05-0.1 part by mass of antioxidant DLTP,1.5-2.5 parts by mass of polyethylene wax and 1-2 parts by mass of carbon black N330.

In some embodiments, the aramid yarn layer has a total yarn density of 600 to 4000dtex;

the thickness of the water blocking belt is 0.08-0.22mm, and the outer surface of the water blocking belt is attached to the inner wall surface of the sealed accommodating space.

In some embodiments, the thickness of the flame retardant inner jacket is 0.8-1.1mm;

the distance between the bottom wall of the sealed accommodating space and the horizontal plane of the flame-retardant outer sheath is 0.6-1.2mm; the maximum distance between the top wall of the sealed accommodating space and the arc surface of the flame-retardant outer sheath is 2.0-3.0mm.

In a second aspect, a method for manufacturing an adsorption type flame retardant access optical cable is provided, comprising the steps of:

wrapping the water-blocking tape outside the optical fiber belt to complete the wrapping process;

paying out the plurality of reinforcing pieces through a pay-off frame, and then enabling the optical fiber ribbon and the plurality of reinforcing pieces which are subjected to the wrapping process to pass through corresponding die holes in a machine head respectively at the same time so as to form a flame-retardant outer sheath by extrusion outside the optical fiber ribbon and the plurality of reinforcing pieces in the wrapping process;

wherein, in the process of forming the flame-retardant outer sheath by extrusion, the adsorption piece and the high flame-retardant material are co-extruded in a machine head by adopting a co-extrusion process.

The beneficial effects that technical scheme that this application provided brought include:

the embodiment of the application provides an adsorption type flame-retardant access optical cable and a manufacturing method, wherein a sealed accommodating space and a plurality of reinforcing pieces are arranged in a flame-retardant outer sheath, and the bottom of the flame-retardant outer sheath is provided with a horizontal plane; the outer periphery of the cross section of the flame-retardant outer sheath is arc-shaped; the plurality of reinforcing pieces are positioned at the periphery of the sealed accommodating space; the optical fiber ribbon is arranged in the sealed accommodating space, and the outside of the optical fiber ribbon is wrapped with a water blocking ribbon; the adsorption piece is connected to the horizontal plane, and the bottom surface of the adsorption piece is provided with a plurality of adsorption cavities; the setting through above structure can be in cancelling sleeve pipe, fine cream, oleamen etc. non-fire-retardant material, does not influence the bending resistance and the shock attenuation performance of optical cable to the area of contact fire when meetting the conflagration has been reduced, the effect of physical separation conflagration to the optical fiber communication influence is played.

When the optical cable laying construction is specifically used, the absorbing part is tightly attached to the wall surface or the ground for laying, the absorbing part is made of rubber materials and has high friction with the wall surface or the ground, air in the absorbing part is discharged after the optical cable is pressed on the wall surface or the ground, the absorbing part is attached to the wall surface or the ground like a suction disc, the reinforcing part is uniformly dispersed and added around the optical fiber belt, the optical cable is uniformly dispersed in gravity, the optical cable is not easily affected by strong wind weather or rotating bending during optical cable construction, the area of the optical cable contacting fire when encountering fire is reduced compared with a circular optical cable, and the effect of physical blocking fire on optical fiber communication is achieved. The water blocking tape replaces the fiber paste in the conventional optical cable, reduces the influence of improper construction on human bodies and optical fibers, facilitates the use and maintenance of the optical cable, and saves the maintenance cost more.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic cross-sectional view of an adsorption-type flame retardant access optical cable according to an embodiment of the present application.

In the figure: 1. a flame retardant outer sheath; 2. sealing the accommodating space; 3. an optical fiber ribbon; 300. a flame retardant inner sheath; 301. an aramid yarn layer; 302. an optical fiber; 4. a water blocking tape; 5. a reinforcing member; 500. a metal reinforcement; 501. FRP reinforcement; 6. an absorbent member.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present application based on the embodiments herein.

The fiber paste has two protection effects on the optical fibers in the loose tube: one is to prevent moisture in the air from attacking the fiber. Secondly, the buffer optical fiber plays a role of a liner to buffer the optical fiber from the influence of mechanical forces such as vibration, impact, bending and the like. One particularly important factor in the use of optical cables is their long-term stability, which only ensures the stability and hence the efficient transmission. The use of ointments is one of the important guarantees for stability. Firstly, the ointment can protect the internal structure of the optical cable, prevent the optical fiber cable from being influenced by external environment, mechanical impact and the like, and effectively reduce the breakage rate of the optical fiber. In addition, the ointment can play a role in finer repair, and has a very important role in maintenance of the optical cable.

But non-flame retardant materials such as jacket tubes, pastes, ointments, etc. in fiber optic cables can also affect the flame retardant properties of the overall cable. Particularly, when a fire disaster occurs, the materials may cause brittle fracture of the optical cable, or the optical cable transmission signal is failed or distorted due to the fact that the expansion coefficients are different, the thermal expansion is carried out in the fire disaster, and the cooling shrinkage is uneven after fire extinguishment, so that the problems are needed to be solved, namely, after non-flame-retardant materials such as a sleeve, a fiber paste and an ointment are canceled, how to prevent moisture in the air from corroding the optical fiber and reduce the influence of mechanical forces such as vibration, impact and bending in the optical fiber construction process.

Of course, further improvement of the flame retardant effect is also required on the basis of the flame retardant, so that the scheme of the application is provided.

The embodiment of the application provides an adsorption type flame-retardant access optical cable, which aims to solve the problems that non-flame-retardant materials such as a sleeve, fiber paste, ointment and the like in the optical cable in the related technology also influence the flame retardant performance of the whole optical cable and the thermal expansion of the optical cable is easy to cause the failure or distortion of optical cable transmission signals in the case of fire.

Referring to fig. 1, an adsorption type flame retardant access optical cable, comprising:

a flame-retardant outer sheath 1, the inside of which is provided with a sealed accommodating space 2 and a plurality of reinforcing pieces 5, and the bottom of which is provided with a horizontal plane; the outer circumference of the cross section of the flame-retardant outer sheath 1 is arc-shaped; a plurality of reinforcing members 5 are positioned at the periphery of the sealed accommodating space 2;

an optical fiber ribbon 3 which is arranged in the sealed accommodating space 2 and is wrapped with a water-blocking ribbon 4;

the adsorbing member 6 is connected to the horizontal plane and has a plurality of adsorbing chambers on the bottom surface thereof.

Among them, it should be understood that:

the chord AB divides the circle into two parts, both of which are arcuate. Bow is one of the simplest combined patterns; when the arc of the arc shape is smaller than the semicircle, the area of the arc shape is equal to the difference between the sector area and the triangle area; when the arc of the arc shape is larger than a semicircle, the area of the arc shape is equal to the sum of the area of the fan shape and the area of the triangle; when the arcuate arc is a semicircle, its area is half the area of a circle. The semicircle is one of the bow-shaped, and both the left semicircle and the right semicircle can be said to be bow-shaped; the bow cannot be said to be semi-circular, but only when the bow is semi-circular, the bow at this time can be said to be semi-circular.

Through the arrangement of the structure, when non-flame-retardant materials such as a sleeve, fiber paste, ointment and the like are canceled, the bending resistance and the shock absorption performance of the optical cable are not affected, the area of contact fire when a fire disaster is encountered is reduced, and the effect of physically blocking the influence of the fire disaster on optical fiber communication is achieved.

When the optical cable is specifically used, the absorbing member 6 is tightly attached to a wall or the ground for laying and constructing, the absorbing member 6 is made of rubber materials and has high friction with the wall or the ground, air in the absorbing member is discharged after the optical cable is pressed on the wall or the ground, the absorbing member is similar to a suction disc and is attached to the wall or the ground, the reinforcing member 5 is uniformly dispersed and added on the periphery of the optical fiber belt 3, the gravity dispersion of the optical cable is relatively uniform, the optical cable is not easily affected by strong wind weather or the rotating bending of the optical cable during construction, the position can be adjusted and fixed accordingly, and the construction is convenient; compared with a round optical cable, the area of the optical cable contacting fire when encountering fire is reduced, and the effect of physically blocking the influence of fire on optical fiber communication is achieved. The water blocking tape 4 replaces the use of the fiber paste in the conventional optical cable, reduces the influence of improper construction on human bodies and optical fibers, facilitates the use and maintenance of the optical cable, and saves the maintenance cost more.

In some preferred embodiments, the plurality of stiffeners 5 are distributed along an arc trajectory, which is arranged concentrically with the arc of the arc; the plurality of reinforcing members 5 includes two metal reinforcing members 500 and two FRP reinforcing members 501; two metal reinforcements 500 are positioned above the sealed accommodating space 2; two FRP reinforcing members 501 are located on both sides of the sealed accommodating space 2 in the horizontal plane width direction.

The two reinforcing members 5 are two steel wire reinforcing members which are added in the flame-retardant outer sheath 1 in parallel relative to the sealed accommodating space 2, preferably, the diameter of the steel wires is preferably 0.4-0.6mm, and the nearest distance between the outer edges of the two steel wires is preferably 0.5-0.8mm. The distance between the two steel wires and the outer edge of the flame-retardant outer sheath 1 is more than 1.0mm, and the distance between the two steel wires and the inner edge of the flame-retardant outer sheath 1 is more than 0.4mm.

The diameter of the FRP reinforcement 501 is preferably 0.6-0.8mm, and the distance between the two FRP reinforcement 501 and the outer edge of the flame-retardant outer sheath 1 is more than 0.8mm, and the distance between the two FRP reinforcement 501 and the inner edge of the flame-retardant outer sheath 1 is more than 0.4mm.

In some preferred embodiments, the structural form of the adsorbing member 6 is explained:

first, the shape and area of the top surface of the adsorbing member 6 are the same as the horizontal plane; the absorption member 6 is made of rubber material;

second, the adsorbing member 6 includes a plurality of belt-shaped portions spaced apart in a length direction of the flame-retardant outer sheath 1, each of the belt-shaped portions being made of a rubber material.

Specifically, the cross section of the adsorbing piece 6 is zigzag, the sawteeth at the bottom of the adsorbing piece 6 are distributed at intervals along the width direction of the horizontal plane, and each sawtooth extends along the length direction of the flame-retardant outer sheath 1; an adsorption cavity is formed between two adjacent sawteeth; the tooth height of the absorption part 6 is 0.3-0.6mm, and the tooth pitch is 0.8-1.2mm. The arrangement ensures stable adhesion with the ground and the wall surface.

In some preferred embodiments, in which optical fiber ribbon 3 may be of conventional construction, of course, to further enhance the flame retardant effect, this embodiment has the following arrangement:

the optical fiber ribbon 3 includes a plurality of optical units, each of which includes a flame retardant inner sheath 300, an aramid yarn layer 301, and an optical fiber 302 in this order from the outside to the inside.

Wherein, the flame-retardant inner sheath 300 and the flame-retardant outer sheath 1 are both made of high flame-retardant sheath materials; the high flame retardant sheath material comprises: 45-50 parts by mass of high-density polyethylene, 45-50 parts by mass of magnesium hydroxide flame retardant, 2-3 parts by mass of montmorillonite flame retardant, 5-7 parts by mass of carbonizing agent, 1-5 parts by mass of plasticizer, 0.05-0.1 part by mass of phenolic antioxidant 1010,0.05-0.1 part by mass of antioxidant DLTP,105-2.5 parts by mass of polyethylene wax and 1-2 parts by mass of carbon black N330.

The total yarn density of the aramid yarn layer 301 is 600-4000dtex.

The thickness of the water blocking tape 4 is 0.08-0.22mm, and the outer surface of the water blocking tape 4 is attached to the inner wall surface of the sealed accommodating space 2.

The thickness of the flame retardant inner sheath 300 is 0.8-1.1mm;

the distance between the bottom wall of the sealed accommodating space 2 and the horizontal plane of the flame-retardant outer sheath 1 is 0.6-1.2mm; the maximum distance between the top wall of the sealed accommodating space 2 and the arc surface of the flame-retardant outer sheath 1 is 2.0-3.0mm.

Through the arrangement and the description, when a fire disaster occurs, the high flame-retardant outer sheath on the surface of the optical cable is firstly contacted with flame, and because the heating area of the optical cable is smaller in a wall or ground mode design of the optical cable, magnesium Hydroxide (MH) in the sheath material can cool the flame-retardant matrix, so that the temperature of the flame-retardant matrix is reduced below the temperature necessary for maintaining combustion. Meanwhile, the heat absorption decomposition can generate water vapor or other nonflammable gases, the water vapor or other nonflammable gases can dilute the concentration of combustible matters in the gas phase, and magnesium oxide generated by the heat decomposition can also serve as a good heat insulation protective layer, so that the optical cable is prevented from being damaged by heat, the layered structure of the montmorillonite flame retardant in the sheath material forms a structure similar to that of an isolation layer, heat and gas diffusion can be effectively prevented, and the carbon forming agent can form a stable carbon film in the flame retardant process to prevent oxygen from contacting the combustible matters or flames.

Thus blocking the chain reaction in the process, the optical cable is designed in a full dry mode, no ointment exists, a large amount of non-flame-retardant materials are filled, and the flame-retardant inner sheath 300 can also have the same flame-retardant effect when burning to the subunits. In addition, the flame-retardant outer sheath 1 and the flame-retardant inner sheath 300 are made of environment-friendly materials, and can not generate toxic, flammable or corrosive gas in the combustion process, so that the pollution to the environment is reduced, and the flame-retardant inner sheath can be widely applied to important places such as subways and rail transit. The flame-retardant cable is made of the high flame-retardant sheath material, the cable is combined to be of a full-dry structure, the flame-retardant effect of the cable is integrally improved by adopting the water-blocking tape 4, the combustion smoke quantity of the cable is reduced, and the cable is ensured to have an extremely high flame-retardant effect through the omnibearing flame-retardant design of the invention, so that the requirements of bundled combustion and smoke density combustion are completely met.

In some preferred embodiments, the present application further provides a method for preparing a high flame retardant sheath material:

firstly, weighing raw materials according to the proportion of the components; step two, pouring all the raw materials into a kneading pot for mixing; step three, blanking and double-stage extrusion granulation; and step four, drying and vacuumizing packaging.

Wherein, at normal temperature, the required raw materials are poured into a kneading pot, the mixing blade is rotated at a low speed, and the mixing time in the kneading pot is 20-25 minutes. The temperature range of the extrusion granulation process of the material is 140-160 ℃. The drying and baking process of the hair comprises the following steps: drying with 70-75deg.C hot air flow for 1-2h.

The effects can be illustrated by the following tests: compared with other flame-retardant sheath materials, the high flame-retardant sheath material prepared by the preparation method provided by the invention has great difference in flame retardant property, and the heat release property, smoke release property and quality change of the high flame-retardant sheath material during combustion are comprehensively analyzed by adopting a cone calorimeter.

Table 1 high flame retardant sheath material cone calorimeter test data

Table 2 comparison of conventional flame retardant sheath material 1 cone calorimeter test data

Table 3 comparison of conventional flame retardant sheath material 2 cone calorimeter test data

Table 4 bundled Combustion and smoke density test results for adsorptive high flame retardant access fiber optic cable

By contrast observation:

(1) Ignition time (TTI): the TTI refers to the time(s) from the time when the sample is exposed to the heat radiation source to the time when the continuous ignition phenomenon appears on the surface, when the standard ignition source (arc source) is applied to the sample under a certain radiation heat flow intensity (0-100 kW/m < 2 >), the longer the ignition time is represented by the lower the test combustion probability, and the longest ignition time is compared with the high flame retardant material developed by the invention.

(2) Fire Performance Index (FPI): FPI refers to the ratio of TTI to first PHRR in s.m2/kW. TTI has a certain correlation with the time when a fire in an enclosed space (e.g., room) develops to a flash critical point, i.e., the "flash time". The greater the FPI, the longer the flash time is reached and the less fire hazard. The FPI value of the high-flame-retardant material developed by the invention is maximum and the fire hazard is minimum.

(3) Fire Growth Index (FGI): the ratio of the time that FGI reaches the first peak heat release rate to the first PHRR is in s.m2/kW. FGI reflects the ability of a material to react to heat, with a smaller index indicating that the material, once exposed to a strong thermal environment, can quickly ignite and burn, expanding the fire rapidly, and therefore, the greater the FGI, the less the risk of fire. By comparison, the FGI value of the high-flame-retardance material developed by the invention is maximum and the fire hazard is minimum.

(4) The optical cable has extremely high flame retardant effect and completely meets the requirements of bundled combustion and smoke density combustion.

Comprehensive analysis the high flame retardant sheath prepared by the preparation method of the invention has the best flame retardant property compared with other flame retardant sheaths.

The application also provides a manufacturing method of the adsorption type flame-retardant access optical cable, which comprises the following steps:

step 100, wrapping the water-blocking tape 4 on the outer side of the optical fiber tape 3 to complete a wrapping procedure;

step 101, paying out a plurality of reinforcing members 5 through pay-off racks, and then enabling the optical fiber ribbon 3 and the reinforcing members 5 which are subjected to the wrapping process to pass through corresponding die holes in a machine head respectively and simultaneously so as to extrude the optical fiber ribbon 3 and the reinforcing members 5 in the wrapping process to form a flame-retardant outer sheath 1; wherein, in the process of forming the flame-retardant outer sheath 1 by extrusion, the adsorption piece and the high flame-retardant material are extruded by adopting different extruders by adopting a coextrusion process at a machine head.

The above process is a corresponding process for setting up the optical fiber ribbon 3 for an existing structure.

When the optical fiber ribbon 3 is the new structure proposed in the present application:

the manufacturing method of the adsorption type flame-retardant access optical cable comprises the following steps:

step S01, tightly sleeving optical fibers: the optical fiber 302 is placed on an optical fiber pay-off rack, and is paid out under a certain paying-off tension after passing through a tension guide wheel, the aramid yarn is tiled and paid out through an aramid yarn paying-off device, the aramid yarn and the optical fiber pass through an extrusion molding machine head, a layer of flame-retardant inner sheath 300 is extruded outside the aramid yarn and the optical fiber, and a plurality of optical units are manufactured according to the steps.

And S02, discharging the plurality of tightly sleeved optical units through a pay-off rack, discharging the water-blocking tape 4 under a certain tension through the water-blocking tape pay-off rack, longitudinally wrapping the water-blocking tape outside the subunit through a longitudinal wrapping die, and fixing the water-blocking tape by using binding yarns.

And S03, respectively paying out the steel wire and the FRP reinforcement through pay-off racks, simultaneously extruding a layer of high-flame-retardance sheath material outside the steel wire and the FRP reinforcement through a die hole in the machine head, and extruding the adsorption piece and the high-flame-retardance material in the machine head by adopting a co-extrusion process by using different extruders. The co-extrusion process comprises the following steps: and extruding the high-flame-retardance material by adopting a main machine, extruding the adsorbing piece material by adopting an auxiliary machine, and laminating and co-extruding the two materials at the position of the machine head through a corresponding die.

Wherein, the fiber paying-off tension is 0.6-0.8N and the aramid yarn paying-off tension is 4-6N in the fiber tightening process. The extrusion processing temperature of the high flame retardant material is 130-165 ℃. The extrusion processing temperature of the material of the absorbing part is 130-170 ℃. And the high flame retardant material and the adsorption piece are subjected to grafting treatment (joint and coextrusion through corresponding dies), so that the high flame retardant material and the adsorption piece are tightly connected.

In the description of the present application, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of description of the present application and simplification of the description, and are not indicative or implying that the apparatus or element in question must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present application. Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

It should be noted that in this application, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The foregoing is merely a specific embodiment of the application to enable one skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. An adsorptive flame retardant access cable, comprising:

a flame-retardant outer sheath (1) is internally provided with a sealed accommodating space (2) and a plurality of reinforcing pieces (5), and the bottom of the flame-retardant outer sheath is provided with a horizontal plane; the outer circumference of the cross section of the flame-retardant outer sheath (1) is arc-shaped; a plurality of stiffeners (5) are arranged at the periphery of the sealed accommodating space (2);

an optical fiber ribbon (3) which is arranged in the sealed accommodating space (2) and is wrapped with a water blocking tape (4) outside;

an adsorption member (6) which is connected to the horizontal surface and has a plurality of adsorption chambers on the bottom surface thereof.

2. The adsorptive flame retardant access cable of claim 1, wherein:

the plurality of reinforcing elements (5) are distributed along an arcuate path which is arranged concentrically to the arcuate arc.

3. The adsorptive flame retardant access cable of claim 1 or 2, wherein:

the plurality of reinforcing members (5) includes two metal reinforcing members (500) and two FRP reinforcing members (501); two metal reinforcements (500) are positioned above the sealed accommodating space (2), and two FRP reinforcements (501) are positioned on both sides of the sealed accommodating space (2) in the width direction of the horizontal plane.

4. The adsorptive flame retardant access cable of claim 1, wherein:

the shape and the area of the top surface of the adsorption piece (6) are the same as the horizontal plane; the adsorption piece (6) is made of rubber materials; or alternatively, the first and second heat exchangers may be,

the adsorption piece (6) comprises a plurality of sections of strip-shaped parts which are distributed at intervals along the length direction of the flame-retardant outer sheath (1), and each section of strip-shaped part is made of rubber materials.

5. The adsorptive flame retardant access cable of claim 1, wherein:

the cross section of the adsorption piece (6) is zigzag, the zigzag at the bottom of the adsorption piece (6) is distributed at intervals along the width direction of the horizontal plane, and each zigzag extends along the length direction of the flame-retardant outer sheath (1); and the adsorption cavity is formed between two adjacent sawteeth.

6. The adsorptive flame retardant access cable of claim 1, wherein:

the optical fiber ribbon (3) comprises a plurality of light units, and each light unit comprises a flame-retardant inner sheath (300), an aramid yarn layer (301) and an optical fiber (302) from outside to inside.

7. The adsorptive flame retardant access cable of claim 6, wherein:

the flame-retardant inner sheath (300) and the flame-retardant outer sheath (1) are made of high flame-retardant sheath materials; the high flame retardant sheath material comprises: 45-50 parts by mass of high-density polyethylene, 45-50 parts by mass of magnesium hydroxide flame retardant, 2-3 parts by mass of montmorillonite flame retardant, 5-7 parts by mass of carbonizing agent, 1-5 parts by mass of plasticizer, 0.05-0.1 part by mass of phenolic antioxidant 1010,0.05-0.1 part by mass of antioxidant DLTP,1.5-2.5 parts by mass of polyethylene wax and 1-2 parts by mass of carbon black N330.

8. The adsorptive flame retardant access cable of claim 6, wherein:

the total yarn density of the aramid yarn layer (301) is 600-4000dtex;

the thickness of the water blocking tape (4) is 0.08-0.22mm, and the outer surface of the water blocking tape (4) is attached to the inner wall surface of the sealed accommodating space (2).

9. The adsorptive flame retardant access cable of claim 6 or 7, wherein:

the thickness of the flame-retardant inner sheath (300) is 0.8-1.1mm;

the distance between the bottom wall of the sealed accommodating space (2) and the horizontal plane of the flame-retardant outer sheath (1) is 0.6-1.2mm; the maximum distance between the top wall of the sealed accommodating space (2) and the arc surface of the flame-retardant outer sheath (1) is 2.0-3.0mm.

10. A method of manufacturing an adsorptive flame retardant access cable according to claim 1, comprising the steps of:

wrapping the water blocking tape (4) on the outer side of the optical fiber tape (3) to finish a wrapping process;

paying out the plurality of reinforcing pieces (5) through pay-off racks, and then enabling the optical fiber ribbon (3) and the plurality of reinforcing pieces (5) which are subjected to the wrapping process to pass through corresponding die holes in a machine head respectively at the same time so as to extrude the optical fiber ribbon (3) and the plurality of reinforcing pieces (5) in the wrapping process to form a flame-retardant outer sheath (1);

wherein, in the process of forming the flame-retardant outer sheath (1) by extrusion, the adsorption piece and the high flame-retardant material are extruded by co-extrusion in a machine head by adopting a co-extrusion process.