Environment-friendly easy-to-strip armored optical cable and preparation method thereof

Abstract

The invention discloses an environment-friendly easy-to-strip armored optical cable and a preparation method thereof, and belongs to the technical field of optical cable design and manufacture, the environment-friendly easy-to-strip armored optical cable comprises a cable core, and an inner protective layer, an armored layer and an outer protective layer which are sequentially arranged at the periphery of the cable core, and easy-to-tear parts are respectively arranged on the inner protective layer, the armored layer and the outer protective layer, so that when the optical cable is stripped, the optical cable can be stripped conveniently, and the service life of the cable is prolonged. The inner and outer protective layers and the armor layer can be stripped and the cable core can be taken out by hands without tools, thereby improving the stripping efficiency of the optical cable and reducing the construction difficulty. According to the environment-friendly easy-to-strip armored optical cable and the preparation method thereof, the structure is simple, the design is ingenious, the easy-to-strip effect of the optical cable is achieved, the use performance and the recycling performance of the optical cable are optimized, and the environment-friendly easy-to-strip armored optical cable has good application prospects and popularization value.

Description

Technical Field

[0001] The present invention belongs to the field of optical cable design and manufacturing, and particularly relates to an environment-friendly easily peelable armored optical cable and a preparation method thereof. Background Art

[0002] With the continuous in-depth development of optical fiber communication, the use of optical cables is becoming more and more popular, and the workload of optical cable laying is also increasing. However, due to the high labor cost in the foreign market and the continuous growth of labor cost in the domestic market, the performance requirements for easy splicing and easy peeling of optical cables have been significantly improved to improve the construction experience and construction efficiency of construction workers. In addition, with the gradual penetration of the concept of low-carbon environmental protection, it is necessary to consider the energy consumption problems in the product replacement and natural elimination processes during the product design stage.

[0003] In the prior art, to achieve the effect of easy peeling of the optical cable, generally, improvements are made to the armored layer and the sheath layer.

[0004] To achieve the effect of easy peeling of the armored layer, generally, during the longitudinal wrapping stage of the steel strip, two steel strips are directly used for longitudinal wrapping. After longitudinal wrapping, there are two overlapping joints in the formed armored layer, and during construction, separation is directly carried out from the two overlapping joints. However, during the longitudinal wrapping processing and production process, two sets of steel strip pay-off devices and two longitudinal wrapping films for the steel strips need to be correspondingly set, the forming table design is complex, and during the production process, it is necessary to ensure that the overlapping width of the two overlapping joints is sufficient, with high requirements for production accuracy. In addition, to ensure that the two steel strips do not spread before subsequent extrusion, it is also necessary to apply glue to the overlapping joints, which additionally increases the production process and reduces the production efficiency and production cost.

[0005] To achieve the easy peeling efficiency of the sheath layer, generally, there are two methods: (1) embedding foreign objects in the sheath; during the extrusion process of the sheath layer, foreign objects such as filling ropes are embedded in the sheath, and during construction, the function of easily peeling the sheath is achieved by removing the filling ropes; however, during the production process, two additional filling rope pay-off devices are required, and a special die core is needed to make the filling ropes in the middle position of the sheath, so the requirements for the tension control of the pay-off devices are relatively high, and the bending performance of the optical cable produced by this method drops sharply at the filling rope position. (2) longitudinally grooving or longitudinally protruding the sheath; by longitudinally grooving or setting protrusions on the surface of the sheath, stress concentration occurs along the grooved or protruding areas during peeling, thereby achieving the effect of easy tearing and peeling; however, this method essentially only causes a phenomenon of stress concentration locally in the longitudinal direction, and the peeling strength of the sheath has not been reduced; if the wall thickness is greater than 0.5 mm, it is almost impossible to complete the peeling by hand alone, and it does not achieve the actual easy peeling in the actual use process. Summary of the Invention

[0006] In view of one or more of the above-mentioned defects or improvement requirements of the prior art, the present invention provides an environmentally friendly and easily peelable armored optical cable and a preparation method thereof, which can achieve the effect of easy peeling of the overall optical cable without a cable-opening rope, facilitating the construction and recycling of the optical cable.

[0007] To achieve the above object, in one aspect of the present invention, an environmentally friendly and easily peelable armored optical cable is provided, which includes a cable core, an inner sheath, an armor layer, and an outer sheath arranged in sequence from inside to outside;

[0008] At least one first easily tearable portion is provided on the inner sheath, which penetrates the inner and outer surfaces of the inner sheath and extends continuously in the longitudinal direction;

[0009] At least one second easily tearable portion extending in the longitudinal direction is provided on the armor layer;

[0010] At least one third easily tearable portion is provided on the outer sheath, which penetrates the inner and outer surfaces of the outer sheath and extends continuously in the longitudinal direction.

[0011] As a further improvement of the present invention, at least one of the first easily tearable portions, at least one of the second easily tearable portions, and at least one of the third easily tearable portions overlap radially.

[0012] As a further improvement of the present invention, the cross-sectional width of the first easily tearable portion and the third easily tearable portion is greater than 0.1 mm and less than 1 / 6 of the circumference of the circle where they are located.

[0013] As a further improvement of the present invention, the cross-sectional width of the third easily tearable portion on the side close to the armor layer is greater than 3 mm.

[0014] As a further improvement of the present invention, the first easily tearable portion and the third easily tearable portion are made of the same material, and the material, by mass components, includes:

[0015] 55 - 85 parts of low-density polyethylene, 10 - 20 parts of high-density polyethylene, 3 - 20 parts of cycloolefin, 0.1 - 0.5 parts of antioxidant, 0.1 - 0.5 parts of light stabilizer, and 2 - 4 parts of masterbatch.

[0016] As a further improvement of the present invention, the Elmendorf transverse tear strength of the first easily tearable portion and / or the third easily tearable portion is greater than 100 g, and the longitudinal tear strength is less than 30 g.

[0017] As a further improvement of the present invention, the difference in the longitudinal tear strength between the second easily tearable portion and other parts of the armor layer is greater than 5%;

[0018] and / or

[0019] The difference in longitudinal tear strength between the first tearable part and the other parts of the inner sheath and the third tearable part and the outer sheath is greater than 5%.

[0020] As a further improvement of the present invention, the second tearable part is a notch longitudinally extending along the armor layer;

[0021] The notch extends continuously longitudinally, and the depth of the notch is less than the thickness of the armor layer; or, the notch extends intermittently longitudinally to form an intermittent notch.

[0022] As a further improvement of the present invention, the adhesion between the armor layer and the outer sheath is less than 0.5 N / mm.

[0023] As a further improvement of the present invention, an anti-twist-back thin layer is further provided between the cable core and the inner sheath, and the material used for the anti-twist-back thin layer is the same as the main material of the inner sheath.

[0024] Another aspect of the present invention provides a method for preparing an environmentally friendly easily peelable armored optical cable, including the following steps:

[0025] (1) Prepare a cable core;

[0026] (2) Simultaneously extrude the tearable material and the main material of the inner sheath through a die to form the inner sheath, and form the first tearable part on the inner sheath;

[0027] (3) Perform local weakening treatment along the longitudinal direction of the metal steel strip to form a second tearable part on the metal steel strip, and longitudinally wrap the treated metal steel strip around the outer periphery of the inner sheath to form an armor layer;

[0028] (4) Simultaneously extrude the tearable material and the main material of the outer sheath through a die to form the outer sheath, and form a third tearable part on the outer sheath.

[0029] As a further improvement of the present invention, in steps (2) and (4), the die includes a die cover and a die core;

[0030] The die core is arranged at the center of the die and extends continuously longitudinally as a feeding channel for the cable core;

[0031] The die cover is provided with a main sheath material extrusion channel and a tearable material extrusion channel;

[0032] The main sheath material extrusion channel is arranged in a ring shape and is coaxial with the die core;

[0033] The tearable material extrusion channel communicates with the main sheath material extrusion channel near the outlet of the main sheath material extrusion channel.

[0034] As long as the above-mentioned improved technical features do not conflict with each other, they can be combined with each other.

[0035] Generally speaking, compared with the prior art, the beneficial effects of the above technical solutions conceived by the present invention include:

[0036] (1) For the environment-friendly easily peelable armored optical cable of the present invention, by respectively arranging easily tearable parts on the inner sheath layer, the armored layer and the outer sheath layer, when peeling the optical cable, the inner and outer sheath layers and the armored layer can be peeled off and the cable core can be taken out without tools by hand, improving the peeling efficiency of the optical cable and reducing the construction difficulty.

[0037] (2) For the environment-friendly easily peelable armored optical cable of the present invention, by arranging the first easily tearable part, the second easily tearable part and the third easily tearable part to overlap along the radial direction of the optical cable and making the three in the same straight line, the inner and outer sheath layers and the armored layer can be peeled off simultaneously during construction, further improving the peeling speed of the construction personnel.

[0038] (3) For the preparation method of the environment-friendly easily peelable armored optical cable of the present invention, by extruding the easily tearable material and the main material of the sheath layer simultaneously through a mold, the adhesion between the material of the easily tearable part and the sheath material can be ensured.

[0039] (4) The environment-friendly easily peelable armored optical cable and its preparation method of the present invention have a simple structure and ingenious design, realizing the easily peelable effect of the optical cable, optimizing the use performance and recycling performance of the optical cable, and having good application prospects and popularization value. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the following described drawings are only some embodiments of the present invention. For those skilled in the art, without creative efforts, other drawings can be obtained according to these drawings.

[0041] Figure 1 It is a schematic diagram of the overall structure of the environment-friendly easily peelable armored optical cable in the embodiment of the present invention;

[0042] Figure 2 It is a partially enlarged schematic diagram of part A of the environment-friendly easily peelable armored optical cable in the embodiment of the present invention;

[0043] Figure 3 It is a schematic cross-sectional view of the mold used for preparing the environment-friendly easily peelable armored optical cable in the embodiment of the present invention;

[0044] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically: 1. optical unit; 2. central strengthening member; 3. anti-twist-back thin layer; 4. inner protective layer; 5. armor layer; 6. outer protective layer; 7. first tearable portion; 8. second tearable portion; 9. third tearable portion; 10. mold cover; 11. mold core; 12. tearable material extrusion channel; 13. main sheath material extrusion channel; 14. cable core passing direction. Detailed implementation manners

[0045] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. In addition, the technical features involved in the various implementation manners of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0046] In the description of the present invention, it should be understood that the terms "central", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0047] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0048] In the present invention, unless otherwise clearly specified and limited, the terms "mounted", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is less than that of the second feature.

[0050] Embodiment:

[0051] Please refer to Figures 1 to 3 , the environmentally friendly and easily peelable armored optical cable in the preferred embodiment of the present invention includes a cable core, an inner sheath 4, an armored layer 5 and an outer sheath 6. Among them, the armored layer 5 is arranged between the inner sheath 4 and the outer sheath 6 to improve the compressive resistance of the sheath and provide sufficient strength for the cable core.

[0052] Specifically, the cable core is formed by stranding a plurality of optical units 1. The optical unit 1 is composed of an optical fiber, a water-blocking material coated outside the optical fiber, and a loose tube sleeved on the outermost layer. The loose tube is made of an elastic material such as thermoplastic polyester elastomer to protect the optical fiber inside the loose tube. At the same time, a central strengthening member 2 is arranged in the cable core to improve the strength of the cable core itself, and an anti-twist-back thin layer 3 is arranged on the outer periphery of the cable core to restrain the optical unit 1 during the cabling process and prevent the twisted optical unit 1 from twisting back.

[0053] Preferably, the anti-twist-back thin layer 3 is generally a tying yarn, a polyester tape, a film tape, an extruded thin layer, etc. Further preferably, the material of the anti-twist-back thin layer 3 belongs to the same category as the sheath material, so as to be recycled together with the sheath material by melting later and reduce the impurities in the recycled material.

[0054] Furthermore, the inner sheath 4, the armored layer 5 and the outer sheath 6 arranged in sequence outside the cable core are used to further protect the optical fiber and provide mechanical properties such as tensile resistance, compressive resistance and bending resistance for the optical cable, which is convenient for the transportation and laying of the optical cable. At the same time, in order to facilitate the peeling of the optical cable during the construction process, at least one first easily tearable part 7 is arranged on the inner sheath 4, at least one second easily tearable part 8 is arranged on the armored layer 5, and at least one third easily tearable part 9 is arranged on the outer sheath 6, as Figure 1 shown, so that the overall optical cable does not require an opening rope, and the inner and outer sheaths and the armored layer 5 can be separated and peeled off by hand after the tool starts, and the cable core can be taken out, achieving the effect of easy peeling of the overall optical cable without an opening rope.

[0055] Specifically, the first tearable part 7 penetrates through the inner and outer surfaces of the inner sheath 4 in the radial direction and extends continuously in the longitudinal direction. During actual production, the material of the first tearable part can be co-extruded with the main material of the inner sheath through a die to form the inner sheath 4 with the first tearable part 7.

[0056] Correspondingly, the third tearable part 9 penetrates through the inner and outer surfaces of the outer sheath 6 in the radial direction and extends continuously in the longitudinal direction. During actual production, the material of the third tearable part is co-extruded with the main material of the outer sheath through a die to form the outer sheath 6 with the third tearable part 9.

[0057] Preferably, the cross-sectional width of the first tearable part 7 and the third tearable part 9 is set to be greater than 0.1 mm and less than 1 / 6 of the circumference of the corresponding sheath.

[0058] Preferably, the materials of the first tearable part and the third tearable part are the same. By mass components, it specifically includes: 55 - 85 parts of low-density polyethylene, 10 - 20 parts of high-density polyethylene, 3 - 20 parts of cycloolefin, 0.1 - 0.5 parts of antioxidant, and 0.1 - 0.5 parts of light stabilizer.

[0059] Preferably, the materials of the first tearable part and the third tearable part further include 2 - 4 parts of masterbatch to color the tearable part and form tearable colored stripes on the inner sheath 4 and the outer sheath 6, which is convenient for construction personnel to quickly identify and operate.

[0060] Among them, the content of cycloolefin determines the tearing force and the tearing direction, making the Elmendorf transverse and longitudinal tearing strengths of the tearable part have obvious differences. Preferably, the transverse tearing strength of the first tearable part 7 and / or the third tearable part 9 is set to be greater than 100 g, and the longitudinal tearing strength is less than 30 g, so that the first tearable part 7 and / or the third tearable part 9 has the characteristic of being easily separable longitudinally and difficult to separate transversely.

[0061] Preferably, the difference in the longitudinal tearing strength between the first tearable part 7 and / or the third tearable part 9 and other parts of the inner sheath 4 and the outer sheath 6 is greater than 5%, so that when the optical cable is subjected to a tearing force perpendicular to the longitudinal direction of the optical cable, a strength difference is generated at the boundary between the tearable part and the main material of the sheath, causing the optical cable to rupture along the tearable part.

[0062] Furthermore, the armor layer 5 is generally formed by longitudinally wrapping a steel strip around the outer periphery of the inner sheath 4, and the two sides of the steel strip form a longitudinal wrapping overlap. Before longitudinal wrapping in the present invention, local weakening treatment is first performed along the longitudinal direction of the steel strip, and then longitudinal wrapping is completed to form the armor layer 5. The part subjected to local weakening treatment forms a second tearable part 8 on the armor layer 5, which is convenient for the stripping of the armor layer 5 and the separation between the armor layer 5 and the outer sheath 6.

[0063] Preferably, the second tear - prone part 8 is a notch longitudinally extending along the armored layer 5 and is circumferentially spaced from the longitudinal overlap. This notch can be a continuous notch with a depth less than the thickness of the armored layer 5 and continuous extension, or a discontinuous notch with a depth less than or equal to the thickness of the armored layer 5 and discontinuous extension. It is specifically selected according to production requirements and indicators, and the difference in longitudinal tearing strength between the second tear - prone part 8 and other parts of the armored layer 5 is set to be greater than 5%.

[0064] Preferably, at least one first tear - prone part 7, at least one second tear - prone part 8, and at least one third tear - prone part 9 are arranged to be radially overlapped so that the three are on the same straight line in the radial direction. As Figure 2 shown, when stripping the optical cable, the inner sheath 4, the armored layer 5, and the outer sheath 6 can be stripped simultaneously. Of course, the three can also be arranged not to be on the same straight line, and during construction, the optical cable can be stripped layer by layer.

[0065] As Figure 1 shown in the preferred embodiment, two first tear - prone parts 7 are symmetrically arranged on the inner sheath 4, and two third tear - prone parts 9 are symmetrically arranged on the outer sheath 6. At the same time, local weakening treatment is carried out at the longitudinal center line of the metal steel strip, so that in the armored layer 5 formed by longitudinal wrapping, the second tear - prone part 8 and the overlap of the steel strip are symmetrically distributed along the axis of the optical cable. The first tear - prone part 7, the second tear - prone part 8, and the third tear - prone part 9 on one side are radially overlapped. Correspondingly, the first tear - prone part 7, the overlap of the steel strip, and the third tear - prone part 9 on the other side are also radially overlapped, thereby realizing the simultaneous half - stripping of the inner and outer sheaths and the armored layer 5 to take out the cable core.

[0066] Preferably, the width of the side of the first tear - prone part 7 close to the armored layer 5 and / or the side of the third tear - prone part 9 close to the armored layer 5 is set to be greater than 3 mm to ensure the overlap of the second tear - prone part 8 with the first tear - prone part 7 and the third tear - prone part 9, and to avoid the width of the tear - prone part being too small, resulting in deflection of the metal steel strip during longitudinal wrapping and inability to overlap.

[0067] It can be understood that by respectively arranging tear - prone parts on the outer sheath 6, the armored layer 5, and the inner sheath 4 of the present invention, it is not only convenient for the construction and stripping of the optical cable, but also convenient for the separation between the various structures in the optical cable, easily realizing the requirement that the structural materials can be classified and collected during recycling, avoiding impurities and performance degradation caused by melting and secondary processing of materials, and being more low - carbon and environmentally friendly than the existing structures and processing methods.

[0068] In addition, since the outer sheath 6 is directly extrusion - molded on the outer periphery of the armored layer 5 during production, the adhesion between the armored layer 5 and the outer sheath 6 is tight. Preferably, the adhesion force between the outer sheath 6 and the armored layer 5 is less than 0.5 N / mm, so that the outer sheath 6 can be easily separated from the armored layer 5.

[0069] Furthermore, the environmentally friendly easy-to-peel armored optical cable of the present invention is prepared by the following method steps:

[0070] (1) Prepare the cable core;

[0071] Insert the optical fiber into the flexible sleeve, and fill the water-blocking material in the sleeve to form the optical unit 1; loosely twist a plurality of optical units 1 outside the central strengthening member 2 to form the cable core, and preferably set a binding yarn, a polyester tape, a film wrapping tape, an extruded thin layer, etc. on the outer periphery of the cable core to form an anti-twist-back thin layer 3 to bind the twisted optical unit 1.

[0072] (2) Simultaneously extrude the easy-to-tear material and the main material of the inner sheath through a die to form the inner sheath 4, and form the first easy-to-tear part 7 on the inner sheath 4;

[0073] The present invention uses a die and adopts a co-extrusion method to prepare the inner sheath 4 and the first easy-to-tear part 7.

[0074] Specifically, as Figure 3 shown in Figure 3 , the die includes a die cover 10 and a die core 11, wherein the die core 11 is arranged at the center of the die and continuously extends longitudinally to serve as the feeding channel for the cable core, as

[0075] shown in the cable core passing direction 14 in

[0076] At the same time, an easy-to-tear material extrusion channel 12 and a main sheath material extrusion channel 13 are also arranged on the die cover 10, wherein the main sheath material extrusion channel 13 is arranged at intervals on the outer periphery of the die core 11, and it is arranged in a ring shape and coaxial with the die core 11, so that after the cable core is sent out through the die core 11, the main material of the inner sheath is extruded from the outlet of the main sheath material extrusion channel 13 and covers the outer periphery of the cable core.

[0077] Correspondingly, the easy-to-tear material extrusion channel 12 communicates with the main sheath material extrusion channel 13 near the outlet of the main sheath material extrusion channel 13, so that the easy-to-tear material is extruded together with the main material of the inner sheath.

[0078] During actual production, set the extrusion pressure of the easy-to-tear material to be greater than the extrusion pressure of the main sheath material, so that after the easy-to-tear material enters the main sheath material extrusion channel 13 through the easy-to-tear extrusion channel 102, under the action of the pressure, the main material of the inner sheath is separated to both sides, and then extruded from the outlet of the main sheath material extrusion channel 13 to form a colored strip part, which is the first easy-to-tear part 7.

[0079] (3) Perform local weakening treatment longitudinally along the metal steel strip to form a second easily tearable part 8 on the metal steel strip, and longitudinally wrap the treated metal steel strip around the outer circumference of the inner sheath 4 to form an armor layer 5;

[0080] Before forming the armor layer 5 by longitudinally wrapping the metal steel strip, first perform local weakening treatment on the metal steel strip longitudinally to form a second easily tearable part 8.

[0081] In the preferred embodiment, the second easily tearable part 8 is a notch provided longitudinally along the armor layer 5, which can be generated by equipment such as a metal cutting knife or a laser cutting machine. The notch can be a continuously extending notch, and the depth of the notch is less than the thickness of the metal steel strip. Of course, it can also be an intermittent notch. In this case, the depth of the notch can be less than the thickness of the metal steel strip, or the metal steel strip can be directly cut through.

[0082] It can be understood that when it is a continuous notch, the longitudinal tearing strength of the second easily tearable part 8 can be adjusted by controlling the notch depth. The deeper the notch, the smaller the longitudinal tearing strength. When it is an intermittent notch, the longitudinal tearing strength of the second easily tearable part 8 can be adjusted not only by controlling the notch depth, but also by controlling the length and density of the notch units. The longer the length of the notch unit and the greater the density, the smaller the longitudinal tearing strength of the second easily tearable part 8.

[0083] (4) Simultaneously extrude the easily tearable material and the outer sheath main material through a die to form an outer sheath 6, and form a third easily tearable part 9 on the outer sheath 6.

[0084] In the preferred embodiment, the outer sheath 6 and the third easily tearable part 9 are also formed by co-extrusion. The die and operation method used are the same as those in step (2), only the inner sheath main material needs to be replaced with the outer sheath main material, and the corresponding setting parameters are adjusted according to the preparation requirements of the outer sheath 6.

[0085] The environmentally friendly easily peelable armored optical cable and its preparation method of the present invention have a simple structure and ingenious design, realizing the easily peelable effect of the optical cable, optimizing the use performance and recycling performance of the optical cable, and having good application prospects and promotion values.

[0086] Those skilled in the art can easily understand that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An environmentally friendly easy-to-peel armored optical cable, comprising a cable core, an inner sheath, an armor layer, and an outer sheath arranged in sequence from inside to outside; characterized in that, at least one first easily tearable part is arranged on the inner sheath, penetrating through the inner and outer surfaces of the inner sheath and continuously extending longitudinally; at least one second easily tearable part is arranged on the armor layer and extends longitudinally; at least one third easily tearable part is arranged on the outer sheath, penetrating through the inner and outer surfaces of the outer sheath and continuously extending longitudinally.

2. The environmentally friendly easily peelable armored optical cable according to claim 1, characterized in that, At least one of the at least one first easily tearable part, at least one of the at least one second easily tearable part, and at least one of the at least one third easily tearable part overlap radially.

3. The environmentally friendly and easily peelable armored optical cable according to claim 1, wherein The cross-sectional width of the first easily tearable part and the third easily tearable part is greater than 0.1 mm and less than 1 / 6 of the circumference of the circle where they are located.

4. The environmentally friendly and easily peelable armored optical cable according to claim 3, wherein The cross-sectional width of the third easily tearable part on the side close to the armor layer is greater than 3 mm.

5. The environmentally friendly and easily peelable armored optical cable according to any one of claims 1 to 4, characterized in that The first easily tearable part and the third easily tearable part are made of the same material, and the material, by mass components, includes: 55 - 85 parts of low-density polyethylene, 10 - 20 parts of high-density polyethylene, 3 - 20 parts of cycloolefin, 0.1 - 0.5 parts of antioxidant, 0.1 - 0.5 parts of light stabilizer, and 2 - 4 parts of masterbatch.

6. The environmentally friendly easily peelable armored optical cable according to claim 5, characterized in that, The Elmendorf transverse tear strength of the first easily tearable part and / or the third easily tearable part is greater than 100 g, and the longitudinal tear strength is less than 30 g.

7. The environmentally friendly and easily peelable armored optical cable according to claim 5, wherein The difference in longitudinal tear strength between the second easily tearable part and other parts of the armor layer is greater than 5%; and / or The differences in longitudinal tear strength between the first easily tearable part, the third easily tearable part and other parts of the inner sheath and the outer sheath respectively are greater than 5%.

8. The environmentally friendly and easily peelable armored optical cable according to any one of claims 1 to 4, 6, and 7, characterized in that, The second easily tearable part is a notch arranged longitudinally along the armor layer; The notch extends continuously longitudinally, and the depth of the notch is less than the thickness of the armor layer; or, the notch extends intermittently longitudinally to form an intermittent notch.

9. The environmentally friendly and easily peelable armored optical cable according to claim 8, wherein, The adhesion between the armor layer and the outer sheath is less than 0.5 N / mm.

10. The environmentally friendly easily strippable armored optical cable according to claim 1, characterized in that, An anti-twist prevention thin layer is further arranged between the cable core and the inner sheath, and the material used for the anti-twist prevention thin layer is the same as the main material of the inner sheath.

11. A preparation method of an environmentally friendly and easily peelable armored optical cable, characterized in that, Including the following steps: (1) Prepare a cable core; (2) Simultaneously extrude the easily tearable material and the main material of the inner sheath through a die to form the inner sheath, and form the first easily tearable part on the inner sheath; (3) Perform local weakening treatment longitudinally on the metal steel strip to form the second easily tearable part on the metal steel strip, and longitudinally wrap the treated metal steel strip around the outer circumference of the inner sheath to form the armor layer; (4) Simultaneously extrude the easily tearable material and the main material of the outer sheath through a die to form the outer sheath, and form the third easily tearable part on the outer sheath.

12. The preparation method of the environment-friendly easily strippable armored optical cable according to claim 11, wherein, In steps (2) and (4), the die includes a die cover and a die core; The die core is arranged at the center of the die and extends continuously longitudinally as a feeding channel for the cable core; The die cover is provided with a main sheath material extrusion channel and an easily tearable material extrusion channel; The main sheath material extrusion channel is arranged in a ring shape and is coaxial with the die core; The easily tearable material extrusion channel communicates with the main sheath material extrusion channel near the outlet of the main sheath material extrusion channel.

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