A hand tearable peelable optical unit and optical cable

Abstract

The application discloses a hand-tearable and peelable optical unit and optical cable, and relates to the field of optical information. The hand-tearable and peelable optical unit comprises a first protective sleeve and at least one optical unit in the first protective sleeve. The first protective sleeve comprises a first protective part and at least one first extension part extending in the axial direction. The first extension part comprises, from inside to outside in the circumferential direction of the first protective sleeve, a first extension layer, a first support layer and a first identification layer. The first support layer is made of the same material as the first protective part and is integrated with the first protective part. The breaking elongation of the first extension layer is smaller than that 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 peeled by using scissors and pliers. The breaking elongation of the first extension part is smaller than that of the first support layer, so that the hand-tearable and peelable function can be realized without the aid of external tools.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical information technology, in particular to an optical unit and an optical cable which can be hand-torn and peeled. BACKGROUND

[0002] With the development of the communication industry, the communication network in the city is continuously expanded and reconstructed. In the process of reconstruction, the construction quality of the optical cable is crucial to the entire reconstruction project, especially the fusion of the optical cable, which can directly affect the technical indicators of the network.

[0003] Traditional optical cable stripping requires tools such as knives and pliers to find the tear rope in the cable for stripping. The knife is easy to cut off the tear rope when cutting the protective layer, and the pliers are easy to break the tear rope when pulling it. These factors together result in low efficiency of optical cable stripping. SUMMARY

[0004] The present application provides an optical unit which can be hand-torn and peeled to solve the problem of low efficiency of existing optical cable stripping.

[0005] In a first aspect, the present application provides an optical unit which can be hand-torn and peeled, comprising a first protective sleeve and at least one optical unit located in the first protective sleeve, wherein:

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

[0007] The first extension part comprises a first extension layer, a first support layer and a first identification layer arranged in order from inside to outside in the circumferential direction of the first protective sleeve;

[0008] The first support layer is made of the same material as the first protective part and is integrated with it;

[0009] The breaking elongation rate of the first extension layer is less than that of the first support layer;

[0010] The thickness of the first support layer is greater than that of the first identification layer.

[0011] By arranging the first extension layer, the first support layer and the first identification layer in order from inside to outside, the position of the extension part can be quickly identified through the first identification layer, and the tear rope does not need to be stripped by scissors or pliers. The breaking elongation rate of the first extension part is less than that of the first support layer, which can realize hand-torn and peeled without the aid of external tools. The first support layer is made of the same material as the first protective part and is integrated with it, which can improve the strength of the extension part, provide protection for the optical unit before stripping, reduce the damage of the external environment to the optical unit through the extension part, and improve the stripping efficiency. On the premise of ensuring the mechanical strength of the first protective sleeve, the effect of fast identification and hand-torn of the easy-to-strip part can be realized.

[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 in one piece 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 ratio of the thickness of the first extension layer to the total thickness is within this range, which can improve the tearing performance of the optical unit and facilitate tearing; and / or,

[0016] 0.2≤H2 / H≤0.4. The thickness of the first supporting layer within this range can provide sufficient protection for the optical unit, improve the mechanical properties and thermal aging performance 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. The thickness of the first identification layer is within this range, and 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 circumferential cross-sectional area of ​​the first extension portion to the circumferential cross-sectional area of ​​the first protective cover 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 recessed on both the inside and outside of the first protective cover, the first identification layer is located in the outside recess, and the first extension layer is located in the inside recess. The first support layer being recessed on both the inside and outside of the first protective cover provides space for the first identification layer and the first extension layer. Because the first support layer is recessed on both the inside and outside of the first protective cover, rather than being continuous, the strength of the first protective cover can be increased, reducing the risk of fracture and failure.

[0021] It should be noted that in some embodiments, the first identification layer can be formed of a material with a color marking, and the first extension portion can be identified by color. In some embodiments, the first identification layer can also be made of no material and only have grooves, and the first extension portion can be identified by the position of the grooves. This approach can reduce costs and make the first extension portion easier to tear, thereby improving tearing efficiency.

[0022] In some embodiments, when the first protective sheath is a sheath layer outside the cable core, the material of the protective portion 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 sheath 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 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 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. The material of the first supporting layer is the same as that of the protecting portion.

[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%. The elongation at break of the first supporting layer within this range 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 portion includes at least one of PBT, TPEE, and PP, which can provide protection for the optical fiber bundle, where 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. 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 linear low-density polyethylene accounts for 40% to 80% of the mass of the entire material. 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%. Within this range, the elongation at break of the first supporting layer can improve the protection of the optical fiber and improve the tearability. 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 supporting layer is 15 MPa to 35 MPa. Within this range, the first supporting layer can improve the protection of the optical fiber. It should be noted that when the first protective sheath is a sleeve outside the optical fiber bundle, the tensile strength of the first supporting layer is lower than when the first protective sheath 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 includes a second protective sheath and an optical fiber located within the second protective sheath, wherein:

[0037] The second protective sleeve includes 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 arranged in sequence 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 integrally connected;

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

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

[0042] When the manually-tearable optical unit further includes an optical fiber bundle within the optical unit, the optical fibers need to be stripped during fusion splicing. To improve the stripping efficiency of the internal optical fiber bundle sheath, the optical fiber bundle sheath can also be configured as an easy-to-strip sheath. This allows both the manually-tearable optical unit and the optical fiber bundle to be quickly torn apart, thereby improving manual tearing efficiency. It should be noted that the number of optical fiber bundles can be one or more, and as needed, the sheaths of all or some of the optical fiber bundles can be configured as an easy-to-strip sheath.

[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 following briefly introduces the drawings required for use in the description of the embodiments. 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 any creative work.

[0045] Figure 1 This is a structural diagram of an embodiment of a hand-tearable optical unit of the present application.

[0046] Figure 2 This is a structural diagram of an embodiment of a hand-tearable optical unit of the present application.

[0047] Figure 3 This is a structural diagram of an embodiment of a hand-tearable optical unit of the present application.

[0048] Figure 4This is a structural diagram of an embodiment of a hand-tearable optical unit of 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] To make the objectives, technical solutions, and advantages of this application more clear, the technical solutions of this application will be clearly and completely described below in conjunction with the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of this application without making any creative efforts shall fall within the scope of protection of this application.

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

[0053] Traditional optical cable stripping requires tools such as knives and pliers to find the rip cord in the cable for stripping. The knives can easily cut the rip cord when cutting the cloth strips, and the pliers can easily break the rip cord when pulling the rip cord. These factors together lead to low optical cable stripping efficiency.

[0054] In addition, when the tear rope is placed in the optical cable, it is easy to form a clear outline on the surface of the optical cable, resulting in a decrease in the 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 includes a first protective portion 11 and at least one first extending portion 12 extending in the axial direction;

[0058] The first extension part 12 comprises, from inside to outside, a first extension layer 121, a first support layer 122 and a first identification layer 123 in the circumference of the first protective sleeve 1.

[0059] The first support layer 122 is made of the same material as the first protective part 11 and is integrated with the first protective part 11.

[0060] The breaking elongation of the first extension layer 121 is less than the breaking elongation of the first support layer 122.

[0061] The thickness of the first support layer 122 is greater than the thickness of the first identification layer 123.

[0062] The first extension part 12 comprises, from inside to outside, a first extension layer 121, a first support layer 122 and a first identification layer 123 in the circumference of the first protective sleeve 1.

[0063] It should be noted that the number of the first extension part 12 can be one or multiple. In some embodiments, in order to simultaneously consider the easy tearing effect and the protection strength, two first extension parts can be provided, and the two first extension parts can be symmetrically arranged at two ends of the circumferential diameter to improve the easy tearing performance and the tearing efficiency.

[0064] It should be noted that the first support layer 122 is made of the same material as the first protective part 11 and is integrated with the first protective part 11. In the forming process, the first support layer 122 and the first protective part 11 can be integrally formed to improve the strength of the first protective sleeve 1 and simplify the preparation process.

[0065] In combination with the first aspect, in some embodiments provided by the present application, as shown in Figure 2 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 ratio of the thickness of the first extension layer 121 in the whole thickness is within the range, which can improve the easy tearing performance of the light unit 2 and facilitate tearing.

[0066] With reference to the first aspect, in some embodiments of the present application, as shown in Figure 2 The thickness of the first protective sleeve 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 in this range can provide sufficient protection for the light unit 2, improve the mechanical properties and thermal aging properties of the light unit 2, and at the same time meet the tearing of the extension layer.

[0067] With reference to the first aspect, in some embodiments of the present application, as shown in Figure 2 The thickness of the first protective sleeve 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 in this range can provide sufficient protection for the light unit 2, improve the mechanical properties and thermal aging properties of the light unit 2, and at the same time meet the tearing of the extension layer.

[0068] With reference to the first aspect, in some embodiments of the present application, the cross-sectional area of the first protective sleeve 1 in the circumferential direction is S, and the cross-sectional area of the first extension 12 in the circumferential direction is S1, wherein 1 / 10≤S1 / S≤1 / 8. The proportion of the cross-sectional area of the first extension 12 in the circumferential direction in the cross-sectional area of the first protective sleeve 1 in the circumferential direction is in this range, which can reduce the impact on the strength of the first protective sleeve 1, and at the same time facilitate tearing of the first protective sleeve 1.

[0069] With reference to the first aspect, in some embodiments of the present application, the first support layer 122 is concave on both the inner side and the outer side of the first protective sleeve 1, the first identification layer 123 is arranged in the outer side groove, and the first extension layer 121 is arranged in the inner side groove. By concaving the first support layer 122 on both the inner side and the outer side of the first protective sleeve 1, space is provided for the first identification layer 123 and the first extension layer 121. Since the first support layer 122 is concave on both the inner side and the outer side of the first protective sleeve 1 and does not penetrate through, the strength of the first protective sleeve 1 can be improved, and the failure of breaking can be reduced.

[0070] It should be noted that in some embodiments, the first identification layer 123 can be formed of a material with a color mark, and the first extension 12 can be identified by color. In some embodiments, the first identification layer 123 can also be a groove without any material, and the first extension 12 can be identified by the position of the groove. This way can reduce the cost, and at the same time make the first extension 12 easier to be torn, and improve the tearing efficiency.

[0071] With reference to the first aspect, in some embodiments provided in the present application, when the first protective sleeve 1 is a jacket layer outside the cable core, the material of the protection 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-halogen flame-retardant material, and the nylon includes but is not limited to nylon 6 and nylon 12.

[0072] With reference to the first aspect, in some embodiments provided in the present application, when the first protective sleeve 1 is a jacket layer outside the cable core, the material of the first extension layer 121 includes linear low-density polyethylene and matrix material, the linear low-density polyethylene is 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 fraction of the linear low-density polyethylene in the whole material is 40-80%, and a compatibilizer can be added to improve the compatibility between the linear low-density polyethylene and the matrix material.

[0073] With reference to the first aspect, in some embodiments provided in the present application, when the first protective sleeve 1 is a jacket layer outside the cable core, the material of the first support layer 122 includes at least one of polyethylene, flame-retardant material, and nylon, and the material of the first support layer 122 is the same as that of the protection part.

[0074] With reference to the first aspect, in some embodiments provided in the present application, when the first protective sleeve 1 is a jacket layer outside the cable core, the elongation at break of the first extension layer 121 is 10-80%, and the elongation at break of the first extension layer 121 in this range can improve the easy-tear performance of the first extension layer 121 and improve the easy-tear efficiency.

[0075] With reference to the first aspect, in some embodiments provided in the present application, when the first protective sleeve 1 is a jacket layer outside the cable core, the tensile strength of the first extension layer 121 is 5-10 MPa, and the tensile strength of the first extension layer 121 in this range can improve the easy-tear performance of the first extension layer 121 and improve the easy-tear efficiency.

[0076] With reference to the first aspect, in some embodiments provided in the present application, when the first protective sleeve 1 is a jacket layer outside the cable core, the elongation at break of the first support layer 122 is 400-650%, and the elongation at break of the first support layer 122 in this range can improve the protection of the optical fiber and reduce the influence 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 35 MPa to 55 MPa. 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 conjunction with the first aspect, in some embodiments provided herein, the material of the first extension layer 121 includes linear low-density polyethylene (LLDPE) and a base material. Linear low-density polyethylene (LLDPE) is a material with low tensile strength and elongation at break. The base material includes at least one of polyethylene, a flame retardant material, and nylon. The LLDPE accounts for 40-80% of the total material by weight. A compatibilizer may also be added to improve the compatibility between the LLDPE 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 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.

[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 the elongation at break of the first supporting layer 122 when the first protective cover 1 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 conjunction with the first aspect, in some embodiments provided herein, when the first protective sheath 1 is a sleeve outside the optical fiber bundle, the tensile strength of the first support layer 122 is 15 MPa to 35 MPa. The tensile strength of the first support layer 122 within this range can improve the protection of the optical fiber. It should be noted that the tensile strength of the first support layer 122 when the first protective sheath 1 is a sleeve outside the optical fiber bundle is less than the tensile strength of the first support layer 122 when the first protective sheath 1 is a sheath layer outside the cable core 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 this 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 arranged sequentially from the inside to the outside in the circumference 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 integrally connected;

[0089] The elongation at break of the second extension layer 2121 is less than the elongation at break of the second supporting 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 of the hand-tearable optical unit 100 further includes an optical fiber 22 bundle, the optical fiber 22 needs to be stripped during fusion splicing. 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 configured as an easy-to-strip sheath, so that both the hand-tearable optical unit 100 and the optical fiber 22 bundle can be quickly torn apart, thereby improving the manual tearing efficiency. It should be noted that the number of optical fiber 22 bundles can be one or more, and as needed, the sheaths of all optical fiber 22 bundles can be configured as an easy-to-strip structure, or the sheaths of some optical fiber 22 bundles can be configured as an easy-to-strip structure.

[0092] In a second aspect, this application provides an optical cable comprising the manually removable optical unit 100 described in the first aspect. This optical cable incorporates all the technical solutions of the manually removable optical unit 100 and, therefore, all the beneficial effects of the manually removable optical unit 100, which are not described in detail herein. 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 with reference to embodiments.

[0094] Example 1

[0095] An optical unit that can be torn and peeled by hand, comprising a first protective sleeve, an easy-to-peel protective layer and a first optical unit layer twisted cable core;

[0096] The first protective sleeve includes a first protective portion and two first extending portions extending in the axial direction, wherein the first extending portion includes a first extending layer, a first supporting layer and a first identification 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 sleeve is prepared on the cable core; the extension portion 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), and 1% to 2% compatibilizer (maleic anhydride), and the first identification layer is a groove;

[0098] The first protective portion and the first supporting layer are extruded by one extruder at a molding temperature of 235°C, and the first extension layer is extruded by another extruder at a molding temperature of 255°C. Then, the first protective cover is formed by a double-layer co-extrusion integral die.

[0099] The one-piece mold consists of a mold core and a mold cover. The inner hole of the mold core is 4.9 mm, and the inner hole of the mold cover is 8.0. 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, and 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 ridge of the straight section of the mold cover is designed to be 0.5 mm, and the width of the 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 is 0.6 mm, the thickness of the first extension layer is 0.25 mm, the thickness of the first support layer is 0.2 mm, the depth of the first identification groove is 0.15 mm, and the width of the identification groove is 1.1 mm.

[0101] Example 2

[0102] Example 2 is similar to Example 1, except that the thickness of the first protective cover 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 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 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 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 light unit that can be torn and peeled by hand is similar to Example 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 light unit that can be torn and peeled by hand is similar to Example 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, torsional performance, impact performance and thermal aging performance. The specific testing methods are as follows:

[0117] Peeling force: Split 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 peeling force of the sheath;

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

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

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

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

[0122] Table 1 Test results of the performance of the hand-tearable optical units 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 this application not only meets the requirements for manual stripping but also provides sufficient protection for the optical cable. In Comparative Example 1, since the thickness of the first support layer plus the first identification layer is less than the thickness of the first extension layer, while it is very easy to strip, it does not provide sufficient protection for the optical cable, resulting in reduced cable performance. In Comparative Example 2, since the first extension layer is too thin (the thickness of the first support layer plus the first identification layer is much greater than the thickness of the first extension layer), although it meets the strength performance requirements, it is essentially impossible to strip by hand.

[0125] In summary, the present application, through the sequential arrangement of the first extension layer, the first support layer, and the first identification layer from the inside out, allows the position of the extension portion to be quickly identified through the first identification layer, eliminating the need to peel the easy-to-tear rope with scissors or pliers. The first extension portion has a lower elongation at break than the first support layer, enabling manual peeling without the need for external tools. The first support layer and the first protective portion are made of the same material and are integrally connected, thereby increasing the strength of the extension portion, protecting the optical unit before peeling, reducing damage to the optical unit from the external environment through the extension portion, and improving peeling efficiency. The easy-to-tear portion can be quickly identified and torn open by hand while maintaining 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" 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 expressions 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 an appropriate manner in any one or more embodiments / methods or examples. In addition, those skilled in the art may combine and combine different embodiments / methods or examples described in this specification and the features of 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 merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment comprising 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 further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or equipment comprising the elements. In the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly specified.

[0128] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A light unit that can be torn off by hand, characterized in that: The device comprises a first protective cover and at least one light unit located in the first protective cover, wherein: The first protective sleeve includes 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 arranged in sequence 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 integrally connected; 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, wherein: 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, wherein: 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, wherein: The first supporting 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.

5. The hand-tearable optical unit according to claim 1, wherein: The material of the protection portion 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 manually tearable optical unit according to claim 5, wherein: 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, wherein: The material of the protection portion 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 manually tearable optical unit according to claim 7, wherein: 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 manually tearable optical unit according to claim 1, wherein: At least one of the optical units includes a second protective sheath and an optical fiber located within the second protective sheath, wherein: The second protective sleeve includes 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 arranged in sequence 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 integrally connected; The elongation at break of the second extension layer is less than the elongation at break of the second supporting 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 light unit according to any one of claims 1 to 9.

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