Optical unit capable of being torn and stripped by hand and optical cable

Abstract

The invention discloses an optical unit capable of being torn off by hand and an optical cable, and relates to the field of optical information. The light unit capable of being torn and stripped by hand comprises a first protection sleeve and at least one light unit located in the first protection sleeve, wherein the first protection sleeve comprises a first protection part and at least one first extension part extending along the axial direction; the first extension part comprises a first extension layer, a first supporting layer and a first identification layer which are sequentially arranged from inside to outside in the circumferential direction of the first protective sleeve; the first supporting layer and the first protection part are made of the same material and are connected into a whole; the elongation at break of the first extension layer is smaller than the elongation at break of the first support layer. The position of the extension part can be quickly identified through the first identification layer, and the easy-to-tear rope does not need to be stripped through scissors and pliers; the elongation at break of the first extension part is smaller than that of the first supporting layer, so that hand tearing stripping can be achieved, and external tools are not needed.

Description

Technical Field

[0001] The present application relates to the field of optical information technology, and in particular to an optical unit and an optical cable that can be torn off by hand. Background Art

[0002] With the development of the communications industry, the communication networks in cities are constantly expanding and renovating. During the renovation process, the construction quality of the optical cable is crucial to the entire renovation project, especially the fusion of the optical cable, which can directly affect various technical indicators of the network.

[0003] Traditional optical cable stripping requires the preparation of tools such as knives and pliers to find the rip cord in the cable for stripping. The rip cord is easily cut when the knife cuts the sheath, and the pliers are easy to break the rip cord when pulling it. These factors together lead to low efficiency in optical cable stripping. Summary of the invention

[0004] The present application provides a hand-tearable optical unit to solve the problem of low efficiency in stripping existing optical cables.

[0005] In a first aspect, the present application provides a manually tearable optical unit, comprising a first protective cover and at least one optical unit located in the first protective cover, wherein:

[0006] The first protective sleeve comprises a first protective portion and at least one first extending portion extending in the axial direction;

[0007] The first extension portion includes a first extension layer, a first support layer and a first identification layer which are sequentially arranged from the inside to the outside in the circumferential direction of the first protective sleeve;

[0008] The first supporting layer and the first protecting portion are made of the same material and are connected as one;

[0009] The elongation at break of the first extension layer is less than the elongation at break of the first support layer;

[0010] The thickness of the first supporting layer is greater than the thickness of the first marking layer.

[0011] The present application uses the first extension layer, the first support layer and the first identification layer arranged in sequence from the inside to the outside, so that the position of the extension part can be quickly identified through the first identification layer, without the need to peel the easy-to-tear rope with scissors or pliers; the breaking elongation of the first extension part is less than the breaking elongation of the first support layer, so that it can be torn and peeled by hand without the help of external tools; the first support layer is made of the same material as the first protective part, and is connected as a whole to improve the strength of the extension part, provide protection for the optical unit before peeling, reduce the damage of the external environment to the optical unit through the extension part, and improve the peeling efficiency. The effect of quickly identifying the easy-to-tear part and tearing it by hand can be achieved while ensuring the mechanical strength of the first protective cover.

[0012] It should be noted that the number of the first extension parts can be one or more. In some embodiments, in order to take into account both the easy-to-tear effect and the protection strength, it can be set to two. The two extension parts can be symmetrically arranged at both ends of the circumferential diameter to improve the easy-to-tear performance and the tearing efficiency.

[0013] It should be noted that the first supporting layer and the first protecting portion are made of the same material and are connected as one body. They can be formed by one-piece molding so that the first supporting layer and the first protecting portion form a whole, thereby improving the strength of the first protective cover and simplifying the preparation process.

[0014] In some embodiments, the thickness of the first protective cover is H, the thickness of the first extension layer is H1, the thickness of the first support layer is H2, and the thickness of the first identification layer is H3, wherein:

[0015] 0.4≤H1 / H≤0.5, the proportion of the thickness of the first extension layer in the entire thickness is within this range, which can improve the tearability of the optical unit and facilitate tearing; and / or,

[0016] 0.2≤H2 / H≤0.4, the thickness of the first support layer is within this range, which can provide sufficient protection for the optical unit, improve the mechanical properties and thermal aging properties of the optical unit, and at the same time meet the requirements of being torn by the extension layer; and / or,

[0017] 0.2≤H3 / H≤0.3. When the thickness of the first identification layer is within this range, the extension part can be locked more quickly, which facilitates rapid positioning.

[0018] In some embodiments, the cross-sectional area of ​​the first protective sleeve in the circumferential direction is S, and the cross-sectional area of ​​the first extension portion in the circumferential direction is S1, wherein:

[0019] 1 / 10≤S1 / S≤1 / 8, the proportion of the cross-sectional area of ​​the first extension portion in the circumferential direction to the cross-sectional area of ​​the first protective cover in the circumferential direction is within this range, which can reduce the impact on the strength of the first protective cover and facilitate tearing the first protective cover.

[0020] In some embodiments, the first support layer is concave at both the inner and outer sides of the first protective cover, the first identification layer is arranged in the outer groove, and the first extension layer is arranged in the inner groove. The first support layer is concave at both the inner and outer sides of the first protective cover to provide space for the first identification layer and the first extension layer. Since the first support layer is concave at both the inner and outer sides of the first protective cover and does not penetrate through, the strength of the first protective cover can be improved and fracture failure can be reduced.

[0021] It should be noted that, in some embodiments, the first identification layer may be formed of a material with a color mark, and the first extension part is identified by color. In some embodiments, the first identification layer may also be formed of no material, only a groove, and the first extension part is identified by the position of the groove. This method can reduce costs and make the first extension part easier to tear, thereby improving tearing efficiency.

[0022] In some embodiments, when the first protective cover is a sheath layer outside the cable core, the material of the protective part includes at least one of polyethylene, flame retardant material, and nylon, which can provide protection for the optical cable, wherein the flame retardant material includes but is not limited to flame retardant polyethylene material and low-elongation halogen-free flame retardant material, and nylon includes but is not limited to nylon 6 and nylon 12; and / or,

[0023] When the first protective cover is a sheath layer outside the cable core, the material of the first extension layer includes linear low-density polyethylene and a base material, wherein the linear low-density polyethylene refers to LLDPE, which is a material with low tensile strength and elongation at break. The base material includes at least one of polyethylene, flame retardant material, and nylon. The mass proportion of linear low-density polyethylene in the entire material is 40 to 80%, and a compatibilizer may be added to improve the compatibility between the linear low-density polyethylene and the base material; and / or,

[0024] The material of the first supporting layer includes at least one of polyethylene, flame retardant material and nylon, and the material of the first supporting layer is the same as that of the protecting part.

[0025] In some embodiments, when the first protective cover is a sheath layer outside the cable core, the elongation at break of the first extension layer is 10% to 80%. When the elongation at break of the first extension layer is within this range, the tearing performance of the first extension layer can be improved, and the tearing efficiency can be improved; and / or,

[0026] The tensile strength of the first extension layer is 5 MPa to 10 MPa. If the tensile strength of the first extension layer is within this range, the tearing performance of the first extension layer can be improved, and the tearing efficiency can be improved; and / or,

[0027] The elongation at break of the first supporting layer is 400% to 650%. Within this range, the elongation at break of the first supporting layer can improve the protection of the optical fiber and reduce the impact of the external environment on the optical fiber; and / or,

[0028] The tensile strength of the first supporting layer is 35 MPa to 55 MPa. The tensile strength of the first supporting layer is within this range, which can improve the protection of the optical fiber and reduce the impact of the external environment on the optical fiber.

[0029] In some embodiments, when the first protective cover is a sleeve outside the optical fiber bundle, the material of the protective part includes at least one of PBT, TPEE, and PP, which can provide protection for the optical fiber bundle, PBT refers to polybutylene terephthalate, TPEE refers to thermoplastic polyester elastomer, and PP refers to polypropylene; and / or,

[0030] The material of the first extension layer includes linear low-density polyethylene and a base material, wherein the linear low-density polyethylene refers to LLDPE, which is a material with low tensile strength and elongation at break. The base material includes at least one of polyethylene, flame retardant material, and nylon. The mass proportion of the linear low-density polyethylene in the entire material is 40-80%, and a compatibilizer can also be added to improve the compatibility between the linear low-density polyethylene and the base material; and / or,

[0031] The material of the first supporting layer includes at least one of PBT, TPEE, and PP, and the material of the first supporting layer is the same as that of the protection portion.

[0032] In some embodiments, when the first protective cover is a sleeve outside the optical fiber bundle, the breaking elongation of the first extension layer is 10% to 80%. The breaking elongation of the first extension layer within this range can improve the tearing performance of the first extension layer and improve the tearing efficiency; and / or,

[0033] The tensile strength of the first extension layer is 5 MPa to 10 MPa. If the tensile strength of the first extension layer is within this range, the tearing performance of the first extension layer can be improved, and the tearing efficiency can be improved; and / or,

[0034] The elongation at break of the first supporting layer is 200% to 260%. The elongation at break of the first supporting layer is within this range, which can improve the protection of the optical fiber and improve the tearing performance. It should be noted that when the first protective sleeve is a sleeve outside the optical fiber bundle, the elongation at break of the first supporting layer is less than that when the first protective sleeve is a sheath layer outside the cable core. This is because the sleeve outside the optical fiber bundle is protected by a sheath layer, and the sheath layer outside the cable core requires stronger mechanical strength than the sleeve outside the optical fiber bundle; and / or,

[0035] The tensile strength of the first support layer is 15MPa to 35MPa. The tensile strength of the first support layer is within this range, which can improve the protection of the optical fiber. It should be noted that when the first protective sleeve is a sleeve outside the optical fiber bundle, the tensile strength of the first support layer is less than when the first protective sleeve is a sheath layer outside the cable core. This is because the sleeve outside the optical fiber bundle is protected by a sheath layer, and the sheath layer outside the cable core requires stronger mechanical strength than the sleeve outside the optical fiber bundle.

[0036] In some embodiments, at least one of the optical units comprises a second protective sheath and an optical fiber located in the second protective sheath, wherein:

[0037] The second protective sleeve comprises a second protective portion and at least one second extending portion extending in the axial direction;

[0038] The second extension portion includes a second extension layer, a second support layer and a second identification layer which are sequentially arranged from the inside to the outside in the circumferential direction of the second protective sleeve;

[0039] The second supporting layer and the second protecting portion are made of the same material and are connected as one;

[0040] The elongation at break of the second extension layer is less than the elongation at break of the second support layer;

[0041] The thickness of the second supporting layer is greater than the thickness of the second marking layer.

[0042] When an optical fiber bundle is also provided inside the optical unit of the hand-tearable optical unit, the optical fiber needs to be stripped during fusion splicing. In order to improve the stripping efficiency of the inner optical fiber bundle sheath layer, the optical fiber bundle sheath layer can also be set as an easy-to-strip sheath, so that the hand-tearable optical unit and the optical fiber bundle can be quickly torn apart when stripping, thereby improving the hand-tear efficiency. It should be noted that the number of optical fiber bundles can be one or more, and according to needs, the sheaths of all optical fiber bundles can be set as an easy-to-tear structure, or the sheaths of some optical fiber bundles can be set as an easy-to-tear structure.

[0043] In a second aspect, the present application provides an optical cable, comprising the manually-tearable optical unit described in the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0045] Figure 1 It is a schematic structural diagram of an embodiment of a light unit that can be torn and peeled off by hand in the present application.

[0046] Figure 2 It is a schematic structural diagram of an embodiment of a light unit that can be torn and peeled off by hand in the present application.

[0047] Figure 3 It is a schematic structural diagram of an embodiment of a light unit that can be torn and peeled off by hand in the present application.

[0048] Figure 4It is a schematic structural diagram of an embodiment of a light unit that can be torn and peeled off by hand in the present application.

[0049] Description of Figure Numbers:

[0050] 100 Hand-tearable optical unit; 1 first protective cover; 11 first protective portion; 12 first extension portion; 121 first extension layer; 122 first supporting layer; 123 first identification layer; 2 optical unit; 21 second protective cover; 211 second protective portion; 212 second extension portion; 2121 second extension layer; 2122 second supporting layer; 2123 second identification layer; 22 optical fiber. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in combination with the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0052] With the development of the communications industry, the communication networks in cities are constantly expanding and renovating. During the renovation process, the construction quality of the optical cable is crucial to the entire renovation project, especially the fusion of the optical cable, which can directly affect various technical indicators of the network.

[0053] Traditional optical cable stripping requires the preparation of tools such as knives and pliers to find the rip cord in the cable for stripping. The rip cord is easily cut when the knife cuts the cloth strip, and the rip cord is easily torn when the pliers pull it. These factors together lead to low efficiency in optical cable stripping.

[0054] In addition, when the tear rope is placed in the optical cable, it is easy to form an obvious contour on the surface of the optical cable, resulting in reduced roundness of the optical cable. At the same time, the tear rope will easily fall off due to friction with the path during the release process, causing the sheath to bulge.

[0055] In view of this, the present application provides an optical unit that can be torn and peeled by hand to solve the problem of low efficiency in stripping existing optical cables.

[0056] First, as Figure 1 As shown, the present application provides a light unit 100 that can be torn off by hand, comprising a first protective cover 1 and at least one light unit 2 located in the first protective cover 1, wherein:

[0057] The first protective sleeve 1 comprises a first protective portion 11 and at least one first extending portion 12 extending in the axial direction;

[0058] The first extension portion 12 includes a first extension layer 121, a first support layer 122 and a first identification layer 123 which are sequentially arranged from the inside to the outside in the circumferential direction of the first protective cover 1;

[0059] The first supporting layer 122 and the first protecting portion 11 are made of the same material and are connected as one body;

[0060] The elongation at break of the first extension layer 121 is less than the elongation at break of the first support layer 122;

[0061] The thickness of the first supporting layer 122 is greater than the thickness of the first marking layer 123 .

[0062] The present application uses the first extension layer 121, the first support layer 122 and the first identification layer 123 which are arranged in sequence from the inside to the outside, so that the position of the extension part can be quickly identified through the first identification layer 123, without the need to peel the easy-tear rope with scissors or pliers; the elongation at break of the first extension part 12 is less than the elongation at break of the first support layer 122, so that it can be torn and peeled by hand without the help of external tools; the first support layer 122 is made of the same material as the first protective part 11, and is connected as a whole to improve the strength of the extension part, provide protection for the optical unit 2 before peeling, reduce the damage of the external environment to the optical unit 2 through the extension part, and improve the peeling efficiency. The effect of quickly identifying the easy-to-peel part and tearing it by hand can be achieved while ensuring the mechanical strength of the first protective cover 1.

[0063] It should be noted that the number of the first extension parts 12 can be one or more. In some embodiments, in order to take into account both the easy-tear effect and the protection strength, it can be set to two. The two extension parts can be symmetrically arranged at both ends of the circumferential diameter to improve the easy-tear performance and the tearing efficiency.

[0064] It should be noted that the first supporting layer 122 and the first protecting portion 11 are made of the same material and are connected as one body. They can be formed in one piece so that the first supporting layer 122 and the first protecting portion 11 form a whole, thereby improving the strength of the first protective cover 1 and simplifying the preparation process.

[0065] In combination with the first aspect, in some embodiments provided in the present application, such as Figure 2 As shown, the thickness of the first protective cover 1 is H, the thickness of the first extension layer 121 is H1, the thickness of the first support layer 122 is H2, and the thickness of the first identification layer 123 is H3, wherein: 0.4≤H1 / H≤0.5, the proportion of the thickness of the first extension layer 121 in the entire thickness is within this range, which can improve the tearability of the optical unit 2 and facilitate tearing.

[0066] In combination with the first aspect, in some embodiments provided in the present application, such as Figure 2 As shown, the thickness of the first protective cover 1 is H, the thickness of the first extension layer 121 is H1, the thickness of the first support layer 122 is H2, and the thickness of the first identification layer 123 is H3, wherein: 0.2≤H2 / H≤0.4. The thickness of the first support layer 122 is within this range, which can provide sufficient protection for the optical unit 2, improve the mechanical properties and thermal aging properties of the optical unit 2, and at the same time meet the requirements of being torn by the extension layer.

[0067] In combination with the first aspect, in some embodiments provided in the present application, such as Figure 2 As shown, the thickness of the first protective cover 1 is H, the thickness of the first extension layer 121 is H1, the thickness of the first support layer 122 is H2, and the thickness of the first identification layer 123 is H3, wherein: 0.2≤H3 / H≤0.3. When the thickness of the first identification layer 123 is within this range, the extension part can be locked more quickly, which facilitates quick positioning.

[0068] In combination with the first aspect, in some embodiments provided in the present application, the cross-sectional area of ​​the first protective cover 1 in the circumferential direction is S, and the cross-sectional area of ​​the first extension portion 12 in the circumferential direction is S1, wherein: 1 / 10≤S1 / S≤1 / 8, and the proportion of the cross-sectional area of ​​the first extension portion 12 in the circumferential direction to the cross-sectional area of ​​the first protective cover 1 in the circumferential direction is within this range, which can reduce the impact on the strength of the first protective cover 1 and facilitate tearing open the first protective cover 1.

[0069] In combination with the first aspect, in some embodiments provided in the present application, the first support layer 122 is concave at the inner and outer sides of the first protective cover 1, the first identification layer 123 is arranged in the outer groove, and the first extension layer 121 is arranged in the inner groove. The first support layer 122 is concave at the inner and outer sides of the first protective cover 1, so as to provide space for the first identification layer 123 and the first extension layer 121. Since the first support layer 122 is concave at the inner and outer sides of the first protective cover 1 and does not penetrate, the strength of the first protective cover 1 can be improved and fracture failure can be reduced.

[0070] It should be noted that, in some embodiments, the first identification layer 123 may be formed of a material with a color identification, and the first extension portion 12 may be identified by color. In some embodiments, the first identification layer 123 may also be formed of no material, but only a groove, and the first extension portion 12 may be identified by the position of the groove. This method can reduce costs and make the first extension portion 12 easier to tear, thereby improving tearing efficiency.

[0071] In combination with the first aspect, in some embodiments provided in the present application, when the first protective cover 1 is a sheath layer outside the cable core, the material of the protective part includes at least one of polyethylene, flame retardant material, and nylon, which can provide protection for the optical cable, wherein the flame retardant material includes but is not limited to flame retardant polyethylene material, low-elongation halogen-free flame retardant material, and nylon includes but is not limited to nylon 6 and nylon 12.

[0072] In combination with the first aspect, in some embodiments provided in the present application, when the first protective cover 1 is a sheath layer outside the cable core, when the first protective cover 1 is a sheath layer outside the cable core, the material of the first extension layer 121 includes linear low-density polyethylene and a matrix material, and the linear low-density polyethylene refers to LLDPE, which is a material with low tensile strength and elongation at break. The matrix material includes at least one of polyethylene, flame retardant material, and nylon. The mass proportion of linear low-density polyethylene in the entire material is 40 to 80%, and a compatibilizer can also be added to improve the compatibility between the linear low-density polyethylene and the matrix material.

[0073] In combination with the first aspect, in some embodiments provided in the present application, when the first protective cover 1 is a sheath layer outside the cable core, the material of the first supporting layer 122 includes at least one of polyethylene, flame retardant material, and nylon, and the material of the first supporting layer 122 is the same as the material of the protective part.

[0074] In combination with the first aspect, in some embodiments provided in the present application, when the first protective cover 1 is a sheath layer outside the cable core, the elongation at break of the first extension layer 121 is 10% to 80%. The elongation at break of the first extension layer 121 is within this range, which can improve the tearability of the first extension layer 121 and improve the tearing efficiency.

[0075] In combination with the first aspect, in some embodiments provided in the present application, when the first protective cover 1 is a sheath layer outside the cable core, the tensile strength of the first extension layer 121 is 5 MPa to 10 MPa. The tensile strength of the first extension layer 121 is within this range, which can improve the tearability of the first extension layer 121 and improve the tearing efficiency.

[0076] In combination with the first aspect, in some embodiments provided in the present application, when the first protective cover 1 is a sheath layer outside the cable core, the elongation at break of the first supporting layer 122 is 400% to 650%. The elongation at break of the first supporting layer 122 is within this range, which can improve the protection of the optical fiber and reduce the impact of the external environment on the optical fiber.

[0077] In combination with the first aspect, in some embodiments provided in the present application, when the first protective cover 1 is a sheath layer outside the cable core, the tensile strength of the first supporting layer 122 is 35MPa to 55MPa. The tensile strength of the first supporting layer 122 is within this range, which can improve the protection of the optical fiber and reduce the impact of the external environment on the optical fiber.

[0078] In combination with the first aspect, in some embodiments provided in the present application, when the first protective cover 1 is a sleeve outside the optical fiber bundle, the material of the protective part includes at least one of PBT, TPEE, and PP, which can provide protection for the optical fiber bundle, PBT refers to polybutylene terephthalate, TPEE refers to thermoplastic polyester elastomer, and PP refers to polypropylene.

[0079] In combination with the first aspect, in some embodiments provided in the present application, the material of the first extension layer 121 includes linear low-density polyethylene and a base material, wherein the linear low-density polyethylene refers to LLDPE, which is a material with low tensile strength and elongation at break. The base material includes at least one of polyethylene, flame retardant material, and nylon. The mass proportion of linear low-density polyethylene in the entire material is 40 to 80%, and a compatibilizer can also be added to improve the compatibility between the linear low-density polyethylene and the base material.

[0080] In combination with the first aspect, in some embodiments provided in the present application, the material of the first supporting layer 122 includes at least one of PBT, TPEE, and PP, and the material of the first supporting layer 122 is the same as the material of the protective portion.

[0081] In combination with the first aspect, in some embodiments provided in the present application, when the first protective cover 1 is a sleeve outside the optical fiber bundle, the elongation at break of the first extension layer 121 is 10% to 80%. The elongation at break of the first extension layer 121 is within this range, which can improve the tearability of the first extension layer 121 and improve the tearing efficiency.

[0082] In combination with the first aspect, in some embodiments provided in the present application, when the first protective cover 1 is a sleeve outside the optical fiber bundle, the tensile strength of the first extension layer 121 is 5MPa to 10MPa. The tensile strength of the first extension layer 121 is within this range, which can improve the tearability of the first extension layer 121 and improve the tearing efficiency.

[0083] In combination with the first aspect, in some embodiments provided in the present application, when the first protective cover 1 is a sleeve outside the optical fiber bundle, the elongation at break of the first supporting layer 122 is 200% to 260%. The elongation at break of the first supporting layer 122 is within this range, which can improve the protection of the optical fiber and improve the tearability. It should be noted that when the first protective cover 1 is a sleeve outside the optical fiber bundle, the elongation at break of the first supporting layer 122 is less than that of the first protective cover 1 when it is a jacket layer outside the cable core. This is because the sleeve outside the optical fiber bundle is protected by a jacket layer, and the jacket layer outside the cable core requires stronger mechanical strength than the sleeve outside the optical fiber bundle.

[0084] In combination with the first aspect, in some embodiments provided in the present application, when the first protective sleeve 1 is a sleeve outside the optical fiber bundle, the tensile strength of the first supporting layer 122 is 15MPa to 35MPa. The tensile strength of the first supporting layer 122 within this range can improve the protection of the optical fiber. It should be noted that when the first protective sleeve 1 is a sleeve outside the optical fiber bundle, the tensile strength of the first supporting layer 122 is less than when the first protective sleeve 1 is a sheath layer outside the cable core. This is because the sleeve outside the optical fiber bundle is protected by a sheath layer, and the sheath layer outside the cable core requires stronger mechanical strength than the sleeve outside the optical fiber bundle.

[0085] In combination with the first aspect, in some embodiments provided in the present application, such as Figure 3 and Figure 4 As shown, at least one of the optical units 2 includes a second protective cover 21 and an optical fiber 22 located in the second protective cover 21, wherein:

[0086] The second protective sleeve 21 includes a second protective portion 211 and at least one second extending portion 212 extending in the axial direction;

[0087] The second extension portion 212 includes a second extension layer 2121, a second support layer 2122 and a second identification layer 2123 which are sequentially arranged from the inside to the outside in the circumferential direction of the second protective cover 21;

[0088] The second supporting layer 2122 and the second protecting portion 211 are made of the same material and are connected as one;

[0089] The elongation at break of the second extension layer 2121 is less than the elongation at break of the second support layer 2122;

[0090] The thickness of the second supporting layer 2122 is greater than the thickness of the second identification layer 2123 .

[0091] When the optical unit 2 in the hand-tearable optical unit 100 is also provided with an optical fiber 22 bundle, the optical fiber 22 needs to be stripped during fusion splicing. In order to improve the stripping efficiency of the sheath layer of the internal optical fiber 22 bundle, the sheath layer of the optical fiber 22 bundle can also be set as an easy-to-strip sheath, so that the hand-tearable optical unit 100 and the optical fiber 22 bundle can be quickly torn apart when stripping, thereby improving the hand-tear efficiency. It should be noted that the number of optical fiber 22 bundles can be one or more, and according to needs, the sheaths of all optical fiber 22 bundles can be set as an easy-to-tear structure, or the sheaths of some optical fiber 22 bundles can be set as an easy-to-tear structure.

[0092] In a second aspect, the present application proposes an optical cable, comprising the hand-tearable optical unit 100 described in the first aspect. The optical cable has all the technical solutions of the hand-tearable optical unit 100, and thus also has all the beneficial effects of the hand-tearable optical unit 100, which will not be described in detail in this application. The measuring device includes, but is not limited to, a temperature measuring device or a humidity measuring device.

[0093] The technical solution provided in this application is described in detail below in conjunction with embodiments.

[0094] Example 1

[0095] A hand-tearable optical unit comprises a first protective sleeve easy-to-peel protective layer and a first optical unit layer-twisted cable core;

[0096] The first protective sleeve comprises a first protective portion and two first extending portions extending in the axial direction, wherein the first extending portion comprises a first extending layer, a first supporting layer and a first marking layer sequentially arranged from the inside to the outside in the circumferential direction of the first protective sleeve;

[0097] The cable core has a size of 4.4 mm, and a first protective cover is prepared on the cable core; the extension part and the first supporting layer are made of high-density polyethylene material, the first extension layer material is 40% polyethylene material, 60% LLDPE (linear low-density polyethylene) linear low-density polyethylene, 1% to 2% compatibilizer (maleic anhydride), and the first identification layer is a groove;

[0098] The first protection part and the first support layer are extruded by one extruder, and the molding temperature is set to 235° C. The first extension layer is extruded by another extruder, and the extrusion temperature is set to 255° C., and then they are prepared together by a double-layer co-extrusion integrated die to form a first protective cover;

[0099] The one-piece mold is composed of a mold core and a mold cover, the inner hole of the mold core is 4.9 mm, the inner hole of the mold cover is 8.0, and a tube extrusion mold is used. The first protective sleeve is extruded from the guide channel, the flow channel diameter is designed to be 1.0 mm, the distance between the guide channel and the cone surface of the mold core is designed to be 0.5 mm, the height of the convex ridge of the straight section of the mold cover is designed to be 0.5 mm, and the width of the convex ridge is designed to be 1.5 mm;

[0100] At a production speed of 50 m / min and a second extruder speed of 15 r / min, the thickness of the first protective cover finally prepared was 0.6 mm, the thickness of the first extension layer was 0.25 mm, the thickness of the first support layer was 0.2 mm, the depth of the first identification groove was 0.15 mm, and the width of the identification groove was 1.1 mm.

[0101] Example 2

[0102] Example 2 is similar to Example 1, except that the thickness of the first protective cover finally prepared is 0.6 mm, the thickness of the first extension layer is 0.30 mm, the thickness of the first support layer is 0.18 mm, the depth of the first identification groove is 0.12 mm, and the width of the identification groove is 1.1 mm.

[0103] Example 3

[0104] Example 2 is similar to Example 1, except that the thickness of the first protective cover finally prepared is 0.6 mm, the thickness of the first extension layer is 0.23 mm, the thickness of the first support layer is 0.19 mm, the depth of the first identification groove is 0.18 mm, and the width of the identification groove is 1.1 mm.

[0105] Example 4

[0106] Example 2 is similar to Example 1, except that the thickness of the first protective cover finally prepared is 0.6 mm, the thickness of the first extension layer is 0.24 mm, the thickness of the first support layer is 0.21 mm, the depth of the first identification groove is 0.15 mm, and the width of the identification groove is 1.1 mm.

[0107] Example 5

[0108] Example 2 is similar to Example 1, except that: the thickness of the first protective cover finally prepared is 0.6 mm, the thickness of the first extension layer is 0.24 mm, the thickness of the first support layer is 0.24 mm, the depth of the first identification groove is 0.12 mm, and the width of the identification groove is 1.1 mm.

[0109] Comparative Example 1:

[0110] A hand-tearable optical unit is similar to Embodiment 1, except that:

[0111] The thickness of the first protective cover finally prepared is 0.6 mm, the thickness of the first extension layer is 0.4 mm, the thickness of the first support layer is 0.05 mm, the thickness of the first identification layer is 0.15 mm, and the width of the identification layer is 1.1 mm.

[0112] Comparative Example 2:

[0113] A hand-tearable optical unit is similar to Embodiment 1, except that:

[0114] The thickness of the first protective cover finally prepared is 0.6 mm, the thickness of the first extension layer is 0.05 mm, the thickness of the first support layer is 0.25 mm, the thickness of the first identification layer is 0.30 mm, and the width of the identification layer is 1.1 mm.

[0115] Performance Testing

[0116] The peelable optical units of Examples 1 to 5 and Comparative Examples 1 to 2 were tested for peeling force, torsion performance, impact performance and thermal aging performance. The specific testing methods are as follows:

[0117] Stripping force: Divide the sheath into two parts along the marked groove, use a tensile testing machine to fix the sheaths on both sides, and start the tensile testing machine to test the sheath stripping force;

[0118] Torsion performance: Use a torque machine to clamp both ends of a 1m cable, with a 40N counterweight at one end, a torsion angle of ±180°, and twist 5 times;

[0119] Impact performance: 2J hammer, 1m high, impact 3 points at the marking groove, 1 time at each point;

[0120] Heat aging test: 50D cable coil is placed in a 100℃ oven for 120h.

[0121] The test results are shown in Table 1:

[0122] Table 1 Test results of hand-tearable optical unit performance of Examples 1 to 5 and Comparative Examples 1 to 2

[0123]

[0124] As can be seen from Table 1, the hand-tearable optical unit provided by the present application can not only meet the hand-stripping requirements, but also provide sufficient protection for the optical cable. In Comparative Example 1, since the thickness of the first support layer plus the thickness of the first identification layer is less than the thickness of the first extension layer, although it is very easy to strip, the protection of the optical cable is insufficient, resulting in a decrease in the performance of the optical cable. In Comparative Example 2, since the first extension layer is too thin, the thickness of the first support layer plus the thickness of the first identification layer is much greater than the thickness of the first extension layer. Although it meets the strength performance requirements, it is basically impossible to strip by hand.

[0125] In summary, the present application can quickly identify the position of the extension part through the first identification layer by sequentially arranging the first extension layer, the first support layer and the first identification layer from the inside to the outside, without the need to peel the easy-tear rope with scissors or pliers; the breaking elongation of the first extension part is less than the breaking elongation of the first support layer, so it can be torn and peeled by hand without the help of external tools; the first support layer and the first protective part are made of the same material and are connected as a whole to improve the strength of the extension part, provide protection for the optical unit before peeling, reduce the damage of the external environment to the optical unit through the extension part, and improve the peeling efficiency. The effect of quickly identifying the easy-to-peel part and tearing it by hand can be achieved while ensuring the mechanical strength of the first protective cover.

[0126] In the description of this specification, the description with reference to the terms "one embodiment / method", "some embodiments / methods", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment / method or example are included in at least one embodiment / method or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment / method or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments / methods or examples. In addition, those skilled in the art may combine and combine the different embodiments / methods or examples described in this specification and the features of the different embodiments / methods or examples, unless they are contradictory.

[0127] It should be noted that, in the present application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of more restrictions, the elements defined by the sentence "comprise one..." do not exclude the existence of other identical elements in the process, method, article or equipment including the elements. In the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically stipulated.

[0128] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A light unit that can be torn off by hand, characterized in that: The invention comprises a first protective cover and at least one optical unit located in the first protective cover, wherein: The first protective sleeve comprises a first protective portion and at least one first extending portion extending in the axial direction; The first extension portion includes a first extension layer, a first support layer and a first identification layer which are sequentially arranged from the inside to the outside in the circumferential direction of the first protective sleeve; The first supporting layer and the first protecting portion are made of the same material and are connected as one; The elongation at break of the first extension layer is less than the elongation at break of the first support layer; The thickness of the first supporting layer is greater than the thickness of the first marking layer.

2. The hand-tearable optical unit according to claim 1, characterized in that: The thickness of the first protective cover is H, the thickness of the first extension layer is H1, the thickness of the first support layer is H2, and the thickness of the first identification layer is H3, wherein: 0.4≤H1 / H≤0.5; and / or, 0.3≤H2 / H≤0.4; and / or, 0.2≤H3 / H≤0.

3.

3. The hand-tearable optical unit according to claim 1, characterized in that: The cross-sectional area of ​​the first protective sleeve in the circumferential direction is S, and the cross-sectional area of ​​the first extension portion in the circumferential direction is S1, wherein: 1 / 10≤S1 / S≤1 / 8.

4. The hand-tearable optical unit according to claim 1, characterized in that: The first supporting layer is concave at both the inner side and the outer side of the first protective cover, the first identification layer is arranged in the outer concave groove, and the first extension layer is arranged in the inner concave groove.

5. The hand-tearable optical unit according to claim 1, characterized in that: The material of the protection part includes at least one of polyethylene, flame retardant material and nylon; and / or, The material of the first extension layer includes linear low-density polyethylene and a base material; and / or, The material of the first supporting layer includes at least one of polyethylene, flame retardant material and nylon.

6. The hand-tearable optical unit according to claim 5, characterized in that: The elongation at break of the first extension layer is 10% to 80%; and / or, The tensile strength of the first extension layer is 5 MPa to 10 MPa; and / or, The elongation at break of the first supporting layer is 400% to 650%; and / or, The tensile strength of the first supporting layer is 35 MPa to 55 MPa.

7. The hand-tearable optical unit according to claim 1, characterized in that: The material of the protection part includes at least one of PBT, TPEE and PP; and / or, The material of the first extension layer includes linear low-density polyethylene and a base material; and / or, The material of the first supporting layer includes at least one of PBT, TPEE and PP.

8. The hand-tearable optical unit according to claim 7, characterized in that: The elongation at break of the first extension layer is 10% to 80%; and / or, The tensile strength of the first extension layer is 5 MPa to 10 MPa; and / or, The elongation at break of the first supporting layer is 200% to 260%; and / or, The tensile strength of the first supporting layer is 15 MPa to 35 MPa.

9. The hand-tearable optical unit according to claim 1, characterized in that: At least one of the optical units comprises a second protective sheath and an optical fiber located in the second protective sheath, wherein: The second protective sleeve comprises a second protective portion and at least one second extending portion extending in the axial direction; The second extension portion includes a second extension layer, a second support layer and a second identification layer which are sequentially arranged from the inside to the outside in the circumferential direction of the second protective sleeve; The second supporting layer and the second protecting portion are made of the same material and are connected as one; The elongation at break of the second extension layer is less than the elongation at break of the second support layer; The thickness of the second supporting layer is greater than the thickness of the second marking layer.

10. An optical cable, characterized in that: The invention comprises the manually-tearable optical unit according to any one of claims 1 to 9.

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