Environmentally friendly easily strippable armored optical cable and preparation method therefor

Abstract

The present invention belongs to the technical field of optical cable design and manufacturing, and disclosed are an environmentally friendly easily strippable armored optical cable and a preparation method therefor. An embodiment comprises a cable core as well as an inner protective layer, an armored layer, and an outer protective layer sequentially arranged around the cable core. When stripping the optical cable, due to separately arranging easy-tear parts on the inner protective layer, the armored layer, and the outer protective layer, the inner and outer protective layers and the armored layer can be stripped away and the cable core can be removed without tools. The optical cable is more efficiently stripped, and work difficulty is reduced. In the environmentally friendly easily strippable armored optical cable and the preparation method therefor, the cable has a simple structure and a clever design, and the effect of easy stripping of the optical cable is achieved; the use properties and the retrieval properties of the optical cable are improved, and the present invention has good application prospects and its widespread popularization is valuable.

Description

An environmentally friendly easy-to-strip armored optical cable and its preparation method Technical Field

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

[0002] With the continuous development of fiber-optic communications, the use of optical cables is becoming increasingly popular, and the workload of cable laying is also increasing. However, due to the high labor costs in foreign markets and the continued growth of labor costs in the domestic market, the demand for optical cables to be easy to connect and strip has increased significantly to improve the construction experience and efficiency of construction workers. In addition, with the gradual deepening of low-carbon and environmental protection concepts, the energy consumption of product upgrades and natural obsolescence needs to be considered during the product design stage.

[0003] In the prior art, in order to achieve the effect of easy stripping of optical cables, improvements are generally made to the armor layer and the sheath layer.

[0004] In order to achieve the effect of easy peeling of the armor layer, two pieces of steel strips are generally used to complete the longitudinal wrapping during the steel strip longitudinal wrapping stage. The armor layer formed after the longitudinal wrapping has two overlaps, and it is directly separated from the two overlaps during construction. However, during the longitudinal wrapping production process, two sets of steel strip pay-off devices and two pieces of steel strip longitudinal wrapping films need to be set up accordingly. The forming table design is complex, and during the production process, it is necessary to ensure that the overlap width of the two overlaps is sufficient, which requires high production precision. In addition, in order to ensure that the two pieces of steel strips do not fall apart before subsequent extrusion, it is also necessary to apply glue to the overlap, which adds additional production steps and reduces production efficiency and production costs.

[0005] There are generally two methods to achieve easy peeling efficiency of the sheath layer: (1) embedding foreign matter in the sheath; during the extrusion process of the sheath layer, foreign matter such as filler rope is embedded in the sheath, and the easy peeling function of the sheath is achieved by removing the filler rope during construction; however, during the production process, two additional sets of filler rope pay-off equipment are required, and a special mold core is required to make the filler rope in the middle of the sheath. Therefore, the tension control requirements of the pay-off equipment are high, and the bending performance of the optical cable produced by this method at the filler rope is sharply reduced. (2) Longitudinal grooves or longitudinal protrusions of the sheath; by making longitudinal grooves or protrusions on the surface of the sheath, stress concentration is caused along the grooves or protrusions during peeling, thereby achieving the effect of easy tearing and peeling; however, this method essentially only causes stress concentration in the longitudinal direction, and the peeling strength of the sheath is not reduced; if the wall thickness is greater than 0.5mm, it is almost impossible to complete the peeling by hand alone, and it does not achieve the practical meaning of easy peeling during actual use. Summary of the Invention

[0006] In response to one or more of the above-mentioned defects or improvement needs in the prior art, the present invention provides an environmentally friendly, easy-to-strip armored optical cable and a preparation method thereof, which can achieve the effect of easy stripping of the entire optical cable without opening the cable rope, thereby facilitating the construction and recycling of the optical cable.

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

[0008] The inner protective layer is provided with at least one first easy-to-tear portion that penetrates the inner and outer surfaces of the inner protective layer and extends continuously in the longitudinal direction;

[0009] The armor layer is provided with at least one second tear-easy portion extending in the longitudinal direction;

[0010] The outer protective layer is provided with at least one third easy-to-tear portion which penetrates the inner and outer surfaces of the outer protective layer and extends continuously in the longitudinal direction.

[0011] As a further improvement of the present invention, at least one of the first easy-tear portion, at least one of the second easy-tear portion, and at least one of the third easy-tear portion overlap in the radial direction.

[0012] As a further improvement of the present invention, the cross-sectional width of the first easy-to-tear portion and the third easy-to-tear portion is greater than 0.1 mm and less than 1 / 6 of the circumference thereof.

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

[0014] As a further improvement of the present invention, the first easy-tear portion and the third easy-tear portion are made of the same material, and the material, calculated by mass, includes:

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

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

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

[0018] and / or

[0019] The differences in longitudinal tear strength between the first easy-tear portion, the third easy-tear portion and the other portions of the inner protective layer and the outer protective layer are greater than 5%.

[0020] As a further improvement of the present invention, the second easy-to-tear portion is a notch extending longitudinally along the armor layer;

[0021] The notches extend continuously along the longitudinal direction, and the depth of the notches is less than the thickness of the armor layer; or the notches extend discontinuously along the longitudinal direction, forming discontinuous notches.

[0022] As a further improvement of the present invention, the bonding force between the armor layer and the outer protective layer 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 strippable armored optical cable, comprising the following steps:

[0025] (1) Preparation of cable core;

[0026] (2) Extruding the easy-tear material and the main material of the inner protective layer simultaneously through a die to form the inner protective layer, and forming a first easy-tear portion on the inner protective layer;

[0027] (3) Performing a local weakening treatment along the longitudinal direction of the metal steel strip to form a second easy-to-tear portion on the metal steel strip, and longitudinally wrapping the treated metal steel strip around the periphery of the inner protective layer to form an armor layer;

[0028] (4) The easy-to-tear material and the main material of the outer protective layer are extruded simultaneously through a die to form the outer protective layer, and a third easy-to-tear portion is formed on the outer protective layer.

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

[0030] The mold core is arranged at the center of the mold and extends continuously in the longitudinal direction to serve as a feeding channel for the cable core;

[0031] The mold cover is provided with a main sheath material extrusion channel and an easy-to-tear material extrusion channel;

[0032] The main sheath material extrusion channel is annularly arranged and coaxial with the mold core;

[0033] The easy-to-tear material extrusion channel is communicated with the main sheath material extrusion channel near an outlet of the main sheath material extrusion channel.

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

[0035] In general, the above technical solutions conceived by the present invention have the following beneficial effects compared with the prior art:

[0036] (1) The environmentally friendly, easily strippable armored optical cable of the present invention is provided with easy-to-tear portions on the inner sheath, armor and outer sheath, respectively, so that when the optical cable is stripped, the inner and outer sheaths and armor can be stripped off by hand without tools and the cable core can be taken out, thereby improving the stripping efficiency of the optical cable and reducing the construction difficulty.

[0037] (2) The environmentally friendly easy-to-strip armored optical cable of the present invention is characterized in that the first easy-to-tear portion, the second easy-to-tear portion and the third easy-to-tear portion are arranged to overlap along the radial direction of the optical cable so that the three are on the same straight line, so that the inner and outer sheaths and the armor layer can be stripped at the same time during construction, thereby further improving the stripping speed of the construction workers.

[0038] (3) The method for preparing the environmentally friendly easy-to-strip armored optical cable of the present invention extrude the easy-to-tear material and the main material of the sheath simultaneously through a mold to ensure the adhesion between the easy-to-tear part material and the sheath material.

[0039] (4) The environmentally friendly easy-to-strip armored optical cable and its preparation method of the present invention have a simple structure and ingenious design, which achieves the easy-to-strip effect of the optical cable, optimizes the use performance and recycling performance of the optical cable, and has good application prospects and promotion 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 briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0041] FIG1 is a schematic diagram of the overall structure of an environmentally friendly, easily strippable armored optical cable according to an embodiment of the present invention;

[0042] FIG2 is a schematic diagram of a partially enlarged structure of part A of an environmentally friendly easy-to-strip armored optical cable according to an embodiment of the present invention;

[0043] 3 is a schematic cross-sectional view of a mold used in preparing an environmentally friendly, easily strippable armored optical cable according to an embodiment of the present invention;

[0044] In all the drawings, the same figure marks represent the same technical features, specifically: 1. optical unit; 2. central reinforcement; 3. anti-twisting thin layer; 4. inner protective layer; 5. armor layer; 6. outer protective layer; 7. first easy-to-tear portion; 8. second easy-to-tear portion; 9. third easy-to-tear portion; 10. mold cover; 11. mold core; 12. easy-to-tear material extrusion channel; 13. main sheath material extrusion channel; 14. cable core passing direction. DETAILED DESCRIPTION

[0045] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is 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 intended to illustrate the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may 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 "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and 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 therefore should not be understood as limiting the present invention.

[0047] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0048] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0049] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature. Example

[0050] Referring to Figures 1 to 3 , the environmentally friendly, easily strippable armored optical cable in a preferred embodiment of the present invention includes a cable core, an inner sheath 4, an armor layer 5, and an outer sheath 6. The armor layer 5 is disposed between the inner sheath 4 and the outer sheath 6 to improve the sheath's compressive strength and provide sufficient strength for the cable core.

[0051] Specifically, the cable core is composed of multiple twisted optical units 1, each consisting of an optical fiber, a water-blocking material coating the optical fiber, and an outermost loose tube. The loose tube is made of a thermoplastic polyester elastomer or other elastic material to protect the optical fiber within. A central reinforcement member 2 is provided within the cable core to enhance its strength, and a thin anti-twist layer 3 is provided around the outer periphery of the cable core to constrain the optical units 1 during cabling and prevent twisting after twisting.

[0052] Preferably, the anti-twisting thin layer 3 is generally a yarn, polyester tape, film wrapping tape, extruded thin layer, etc. It is further preferred that the material of the anti-twisting thin layer 3 belongs to the same category as the sheath material, so that it can be recycled together with the sheath material by melting, thereby reducing impurities in the recycled material.

[0053] Furthermore, the inner sheath 4, armor layer 5, and outer sheath 6, which are sequentially arranged outside the cable core, are used to further protect the optical fiber and provide the optical cable with mechanical properties such as tensile strength, compressive strength, and bending resistance, thereby facilitating the transportation and laying of the optical cable. At the same time, in order to facilitate the stripping of the optical cable during construction, the present invention provides at least one first easy-to-tear portion 7 on the inner sheath 4, at least one second easy-to-tear portion 8 on the armor layer 5, and at least one third easy-to-tear portion 9 on the outer sheath 6. As shown in FIG1 , the entire optical cable does not need to be untied. After the tool is used, the inner and outer sheaths and armor layer 5 can be separated and stripped by hand to remove the cable core, achieving the effect of the entire optical cable being easy to strip without untying the cable.

[0054] Specifically, the first easy-tear portion 7 radially penetrates the inner and outer surfaces of the inner protective layer 4 and extends continuously in the longitudinal direction. In actual production, the first easy-tear portion material and the main material of the inner protective layer can be co-extruded through a mold to form the inner protective layer 4 with the first easy-tear portion 7.

[0055] Correspondingly, the third easy-tear portion 9 radially penetrates the inner and outer surfaces of the outer protective layer 6 and extends continuously in the longitudinal direction; during actual production, the third easy-tear portion material and the main material of the inner protective layer are co-extruded through a mold to form an outer protective layer 6 with the third easy-tear portion 9.

[0056] Preferably, the cross-sectional width of the first easy-to-tear portion 7 and the third easy-to-tear portion 9 is set to be greater than 0.1 mm and less than 1 / 6 of the circumference of the protective layer.

[0057] Preferably, the material of the first easy-tear portion and the material of the third easy-tear portion are the same, and specifically include, by mass components: 55-85 parts of low-density polyethylene, 10-20 parts of high-density polyethylene, 3-20 parts of cyclic polyolefin, 0.1-0.5 parts of antioxidant, and 0.1-0.5 parts of light stabilizer.

[0058] Preferably, the first easy-tear portion material and the third easy-tear portion material also include 2-4 parts of masterbatch to color the easy-tear portion, forming easy-tear color strips on the inner protective layer 4 and the outer protective layer 6, which is convenient for construction workers to quickly identify and operate.

[0059] Among them, the content of cyclic polyolefin determines the tearing force and tearing direction, so that the transverse and longitudinal tearing strengths of the Elmendorf of the easy-to-tear portion have obvious differences. It is preferred to set the transverse tearing strength of the first easy-to-tear portion 7 and / or the third easy-to-tear portion 9 to be greater than 100g, and the longitudinal tearing strength to be less than 30g, so that the first easy-to-tear portion 7 and / or the third easy-to-tear portion 9 have the characteristics of being easy to separate longitudinally but difficult to separate transversely.

[0060] Preferably, the difference in longitudinal tear strength between the first easy-to-tear portion 7 and / or the third easy-to-tear portion 9 and other portions 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 easy-to-tear portion and the main material portion of the sheath, causing the optical cable to rupture along the easy-to-tear portion.

[0061] Furthermore, the armor layer 5 is generally formed by longitudinally wrapping a steel strip around the outer periphery of the inner sheath 4, with the two sides of the steel strip forming a longitudinal overlap. In the present invention, the steel strip is locally weakened longitudinally before longitudinal wrapping, and then the longitudinal wrapping is completed to form the armor layer 5. The locally weakened portion forms a second tear-resistant portion 8 on the armor layer 5, facilitating peeling of the armor layer 5 and facilitating separation of the armor layer 5 from the outer sheath 6.

[0062] Preferably, the second easy-to-tear portion 8 is a notch extending longitudinally along the armor layer 5, and is circumferentially spaced apart from the longitudinal overlap. The notch can be a continuous notch with a depth less than the thickness of the armor layer 5 and extending continuously, or it can be an intermittent notch with a depth less than or equal to the thickness of the armor layer 5 and extending intermittently. The specific selection is based on production requirements and indicators, and the difference in longitudinal tear strength between the second easy-to-tear portion 8 and other parts of the armor layer 5 is set to be greater than 5%.

[0063] Preferably, at least one first easy-tear portion 7, at least one second easy-tear portion 8, and at least one third easy-tear portion 9 are arranged to overlap radially so that the three are on the same radial line, as shown in FIG2 . This allows the inner sheath 4, armor layer 5, and outer sheath 6 to be stripped simultaneously when the optical cable is stripped. Of course, the three can also be arranged to be not on the same straight line, so that the optical cable can be stripped layer by layer during construction.

[0064] In the preferred embodiment shown in Figure 1, two first easy-to-tear portions 7 are symmetrically arranged on the inner sheath 4, and two third easy-to-tear portions 9 are symmetrically arranged on the outer sheath 6; at the same time, the metal steel strip is locally weakened along the longitudinal center line, so that in the armor layer 5 formed by the longitudinal wrapping, the second easy-to-tear portion 8 and the overlap of the steel strip are symmetrically distributed along the central axis of the optical cable; the first easy-to-tear portion 7, the second easy-to-tear portion 8 and the third easy-to-tear portion 9 on one side are radially overlapped, and correspondingly, the first easy-to-tear portion 7, the overlap of the steel strip and the third easy-to-tear portion 9 on the other side are also radially overlapped, thereby realizing the simultaneous peeling of the inner and outer sheath armor layers 5 in half to remove the cable core.

[0065] Preferably, the width of the first easy-tear portion 7 close to the armor layer 5 and / or the width of the third easy-tear portion 9 close to the armor layer 5 is set to be greater than 3 mm to ensure that the second easy-tear portion 8 overlaps with the first easy-tear portion 7 and the third easy-tear portion 9, so as to avoid the easy-tear portion width being too small, causing the metal steel strip to deflect during the longitudinal wrapping process and making it impossible to overlap.

[0066] It can be understood that the present invention provides easy-to-tear portions on the outer sheath 6, the armor layer 5 and the inner sheath 4 respectively, which not only facilitates the stripping of the optical cable during construction, but also facilitates the separation of the various structures in the optical cable, and easily realizes the requirement of classifying the various structural materials during recycling and processing, avoiding impurities and performance degradation caused by the melting and secondary processing of the materials, and is more low-carbon and environmentally friendly than existing structures and processing methods.

[0067] In addition, since the outer protective layer 6 is directly extruded on the outer periphery of the armor layer 5 during production, the armor layer 5 and the outer protective layer 6 are tightly bonded. Preferably, the bonding force between the outer protective layer 6 and the armor layer 5 is less than 0.5N / mm, so that the outer protective layer 6 can be easily separated from the armor layer 5.

[0068] Furthermore, the present invention prepares an environmentally friendly easy-to-strip armored optical cable through the following method steps:

[0069] (1) Preparation of cable core;

[0070] The optical fiber is inserted into a flexible sleeve, and the sleeve is filled with water-blocking material to form an optical unit 1; multiple optical units 1 are loosely twisted outside the central reinforcement 2 to form a cable core, and preferably, a binding yarn, polyester tape, film wrapping tape, extruded thin layer, etc. are arranged on the periphery of the cable core to form an anti-twisting thin layer 3 to restrain the twisted optical units 1.

[0071] (2) The easy-tear material and the main material of the inner protective layer are extruded simultaneously through a die to form the inner protective layer 4, and a first easy-tear portion 7 is formed on the inner protective layer 4;

[0072] The present invention utilizes a mold and adopts a co-extrusion method to prepare the inner protective layer 4 and the first easy-tear portion 7 .

[0073] Specifically, as shown in FIG3 , the mold includes a mold cover 10 and a mold core 11 , wherein the mold core 11 is disposed at the center of the mold and extends continuously in the longitudinal direction to serve as a feeding channel for the cable core, as shown in FIG3 in the cable core passing direction 14 .

[0074] At the same time, a tearable material extrusion channel 12 and a main sheath material extrusion channel 13 are also provided on the mold cover 10, wherein the main sheath material extrusion channel 13 is arranged at intervals on the outer periphery of the mold core 11, and is arranged in a ring shape and coaxial with the mold core 11, so that after the cable core is sent out through the mold 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.

[0075] Accordingly, the easy-to-tear material extrusion channel 12 is communicated 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 along with the main material of the inner sheath.

[0076] During actual production, the extrusion pressure of the easy-tear material is set to be greater than the extrusion pressure of the main sheath material, so that after the easy-tear material enters the main sheath material extrusion channel 13 through the easy-tear extrusion channel 102, under the action of pressure, the main material of the inner sheath is separated to both sides, and then extruded through the outlet of the main sheath material extrusion channel 13 to form a color strip part, which is the first easy-tear part 7.

[0077] In actual production, the width of the first easy-tear portion 7 can be controlled by controlling the extrusion pressure of the easy-tear material. It is understood that the greater the extrusion pressure of the easy-tear material, the greater the distance the easy-tear material moves on both sides of the main sheath after entering the main sheath extrusion channel, and the wider the first easy-tear portion 7 formed.

[0078] (3) Performing local weakening treatment along the longitudinal direction of the metal steel strip to form a second easy-to-tear portion 8 on the metal steel strip, and longitudinally wrapping the treated metal steel strip around the outer periphery of the inner protective layer 4 to form an armor layer 5;

[0079] Before the armor layer 5 is formed by longitudinally wrapping the metal steel strip, the metal steel strip is first locally weakened along the longitudinal direction to form a second easy-to-tear portion 8 .

[0080] In the preferred embodiment, the second easy-tear portion 8 is a score provided longitudinally along the armor layer 5 and can be produced using a metal cutting knife or laser cutting machine. The score can be continuous, with a depth less than the thickness of the metal strip. Alternatively, the score can be intermittent, with a depth less than the thickness of the metal strip, or the score can be cut directly through the metal strip.

[0081] It is understood that when the score is continuous, the longitudinal tear strength of the second easy-tear portion 8 can be adjusted by controlling the score depth. The deeper the score, the lower the longitudinal tear strength. When the score is intermittent, the longitudinal tear strength of the second easy-tear portion 8 can be adjusted not only by controlling the score depth, but also by controlling the length and density of the score units. The longer the score unit length and the greater the density, the lower the longitudinal tear strength of the second easy-tear portion 8.

[0082] (4) The easy-tear material and the main material of the outer protective layer are extruded simultaneously through a die to form the outer protective layer 6, and a third easy-tear portion 9 is formed on the outer protective layer 6.

[0083] In a preferred embodiment, the outer protective layer 6 and the third tearable portion 9 are also formed by co-extrusion, and the mold and operation method used are the same as those in step (2). It is only necessary to replace the main material of the inner protective layer with the main material of the outer protective layer, and adjust the corresponding setting parameters according to the preparation requirements of the outer protective layer 6.

[0084] The environmentally friendly easy-to-strip armored optical cable and the preparation method thereof of the present invention have a simple structure and an ingenious design, achieve the easy-to-strip effect of the optical cable, optimize the use performance and recycling performance of the optical cable, and have good application prospects and promotion value.

[0085] It will be easily understood by those skilled in the art that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An environmentally friendly easy-to-strip armored optical cable, comprising a cable core, an inner sheath, an armor layer and an outer sheath arranged in sequence from the inside to the outside; characterized in that: The inner protective layer is provided with at least one first easy-tear portion which penetrates the inner and outer surfaces of the inner protective layer and extends continuously in the longitudinal direction; The armor layer is provided with at least one second tearable portion extending in the longitudinal direction; The outer protective layer is provided with at least one third easy-to-tear portion which penetrates through the inner and outer surfaces of the outer protective layer and extends continuously in the longitudinal direction.

2. The environmentally friendly easy-to-strip armored optical cable according to claim 1, characterized in that: At least one of the first easy-tear portion, at least one of the second easy-tear portion, and at least one of the third easy-tear portion overlap in a radial direction.

3. The environmentally friendly easy-to-strip armored optical cable according to claim 1, characterized in that: The cross-sectional width of the first easy-to-tear portion and the third easy-to-tear portion is greater than 0.1 mm and less than 1 / 6 of the circumference thereof.

4. The environmentally friendly easy-to-strip armored optical cable according to claim 3, characterized in that: The cross-sectional width of the third easy-to-tear portion close to the armor layer is greater than 3 mm.

5. The environmentally friendly easy-to-strip armored optical cable according to any one of claims 1 to 4, characterized in that: The first easy-to-tear portion and the third easy-to-tear portion are made of the same material, which includes, by mass: 55-85 parts of low-density polyethylene, 10-20 parts of high-density polyethylene, 3-20 parts of cyclic polyolefin, 0.1-0.5 parts of antioxidant, 0.1-0.5 parts of light stabilizer, 2-4 parts of masterbatch.

6. The environmentally friendly easy-to-strip armored optical cable according to claim 5, characterized in that: The Elmendorf's transverse tear strength of the first easy-tear portion and / or the third easy-tear portion is greater than 100 g, and the longitudinal tear strength is less than 30 g.

7. The environmentally friendly easy-to-strip armored optical cable according to claim 5, characterized in that: The difference in longitudinal tear strength between the second easy-tear portion and the other parts of the armor layer is greater than 5%; and / or The differences in longitudinal tear strength between the first easy-to-tear portion, the third easy-to-tear portion and other portions of the inner protective layer and the outer protective layer are greater than 5%.

8. The environmentally friendly easy-to-strip armored optical cable according to any one of claims 1 to 4, 6 and 7, characterized in that: The second easy-to-tear portion is a notch extending longitudinally along the armor layer; The notch extends continuously along the longitudinal direction, and the depth of the notch is less than the thickness of the armor layer; or, the notch extends discontinuously along the longitudinal direction to form an intermittent notch.

9. The environmentally friendly easy-to-strip armored optical cable according to claim 8, characterized in that: The bonding force between the armor layer and the outer protective layer is less than 0.5N / mm.

10. The environmentally friendly easy-to-strip armored optical cable according to claim 1, characterized in that: An anti-twist-back thin layer is also arranged 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.

11. A method for preparing an environmentally friendly easy-to-strip armored optical cable, characterized in that: The steps include: (1) Preparation of cable core; (2) Extruding the easy-tear material and the main material of the inner protective layer through a die simultaneously to form the inner protective layer, and forming a first easy-tear portion on the inner protective layer; (3) performing local weakening treatment along the longitudinal direction of the metal steel strip to form a second easy-to-tear portion on the metal steel strip, and longitudinally wrapping the treated metal steel strip around the periphery of the inner protective layer to form an armor layer; (4) The easy-tear material and the main material of the outer protective layer are extruded simultaneously through a die to form the outer protective layer, and a third easy-tear portion is formed on the outer protective layer.

12. The method for preparing an environmentally friendly easy-to-strip armored optical cable according to claim 11, characterized in that: In step (2) and step (4), the mold includes a mold cover and a mold core; The mold core is arranged at the center of the mold and extends continuously in the longitudinal direction to serve as a feeding channel for the cable core; The mold cover is provided with a main sheath material extrusion channel and an easy-to-tear material extrusion channel; The main sheath material extrusion channel is arranged in an annular manner and is coaxial with the mold core; The easy-tear material extrusion channel is communicated with the main sheath material extrusion channel near an outlet of the main sheath material extrusion channel.

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