Overhead ribbon cable, manufacturing method and manufacturing system for overhead ribbon cable

1 . An overhead ribbon cable, comprising an optical fiber ribbon array, wherein the optical fiber ribbon array comprises a plurality of optical fiber ribbons arranged in an array, a surface of the optical fiber ribbon array being wrapped sequentially with a water-blocking assembly and an outer protection layer in an axial direction of the optical fiber ribbon array, the water-blocking assembly comprising a water-blocking sealing layer formed by heating and curing a sealant, and the water-blocking sealing layer wrapping the surface of the optical fiber ribbon array in the axial direction of the optical fiber ribbon array and filling a gap between two adjacent optical fiber ribbons;

wherein the water-blocking sealing layer is of an elastic structure, the sealant is a water swellable water-blocking filling adhesive, and the cured water-blocking filling adhesive has a hardness of 25 HA to 40 HA, a density of 0.8 g/cm 3 to 1.1 g/cm 3 , and a use temperature of −60° C. to 200° C.;

wherein the optical fiber ribbon array is formed by stacking the plurality of optical fiber ribbons in parallel with each other, each optical fiber ribbon comprises a plurality of optical fibers and a connection layer, wherein the plurality of optical fibers are linearly arranged, the connection layer is located between two adjacent optical fibers, the connection layer wraps a surface of each optical fiber in an axial direction of the each optical fiber, and the connection layer, after photo-curing, forms the optical fiber ribbon together with the optical fibers,

the connection layer has a viscosity of 3800 mPa·S to 4500 mPa·S at 25° C. and a density of 1.08 g/cm 3 to 1.15 g/cm 3 before curing, and the connection layer has an elastic modulus of 350 MPa to 650 MPa, an elongation at break of not less than 35%, and a tensile strength of not less than 15 MPa under preset conditions, wherein the preset conditions are 2.5% elastic deformation and 23° C.

2 . The overhead ribbon cable according to claim 1 , wherein

the connection layer is formed by curing a photo-cured coating containing a resin, and the resin is an acrylic resin.

3 . The overhead ribbon cable according to claim 1 , wherein the each optical fiber is a colored fiber.

4 . The overhead ribbon cable according to claim 1 , wherein the water blocking assembly comprises a water-blocking tape, wherein the water-blocking tape fully wraps the surface of the optical fiber ribbon array in the axial direction of the optical fiber ribbon array, and the water-blocking sealing layer is located at a side, facing the optical fiber ribbon array, of the water-blocking tape.

5 . The overhead ribbon cable according to claim 4 , wherein a surface, adjacent to the optical fiber ribbon array, of the water-blocking tape is a smooth surface, and a surface, adjacent to the outer protection layer, of the water-blocking tape is a rough surface.

6 . The overhead ribbon cable according to claim 1 , wherein a plurality of reinforcing elements are further arranged in the outer protection layer, and the plurality of reinforcing elements are parallel in the axial direction of the optical fiber ribbon array and are symmetrically distributed in the outer protection layer.

7 . The overhead ribbon cable according to claim 6 , wherein a surface of the outer protection layer is further provided with an identification line, a connection of the outer protection layer and the water-blocking assembly is further provided with a plurality of rip cords, the rip cords and the identification line are parallel to an axis of the optical fiber ribbon array, and the plurality of rip cords are uniformly distributed on a peripheral side of the optical fiber ribbon array.

8 . A manufacturing method for an overhead ribbon cable, wherein the manufacturing method is applied to the overhead ribbon cable according to claim 1 , and the manufacturing method comprises:

preparing a plurality of optical fibers into the optical fiber ribbons;

preparing the optical fiber ribbons into the optical fiber ribbon array;

wrapping a surface of the optical fiber ribbon array sequentially with the water-blocking assembly and the outer protection layer in an axial direction of the optical fiber ribbon array, wherein the water-blocking assembly comprises the water-blocking sealing layer formed by heating and curing the sealant, the water-blocking sealing layer wrapping the surface of the optical fiber ribbon array in the axial direction of the optical fiber ribbon array and filling the gap between two adjacent optical fiber ribbons;

and after the optical fiber ribbon array wrapped with the water-blocking assembly and the outer protection layer is cooled and formed, performing pulling and take-up to form the overhead ribbon cable.

9 . The manufacturing method according to claim 8 , wherein the preparing a plurality of optical fibers into the optical fiber ribbons specifically comprises:

forming, by the plurality of optical fibers, an optical fiber group; and

filling a connection layer in a surface of the optical fiber group and gaps, and forming, by the connection layer after photo-curing, the optical fiber ribbon together with the optical fiber group, wherein the connection layer is a photo-cured coating containing a resin.

10 . The manufacturing method according to claim 9 , wherein the preparing the optical fiber ribbons into the optical fiber ribbon array specifically comprises:

unidirectionally stranding the plurality of optical fiber ribbons through a pay-off unit and performing active pay-off under a preset pay-off tension, and stacking by an optical fiber ribbon parallel mould in the pay-off unit to form the optical fiber ribbon array.

11 . The manufacturing method according to claim 10 , wherein the preset pay-off tension is 2 N to 4 N, and a strand pitch of the pay-off unit is 400 mm to 800 mm.

12 . The manufacturing method according to claim 8 , wherein the wrapping the surface of the optical fiber ribbon array sequentially with the water-blocking assembly and the outer protection layer specifically comprises:

wrapping and forming the water-blocking sealing layer on the surface of the optical fiber ribbon array and the gap between two adjacent optical fiber ribbons;

after a water-blocking tape wraps the surface of the optical fiber ribbon array wrapped with the water-blocking sealing layer, enabling the optical fiber ribbon array to horizontally enter a mold core of an extrusion head on an extrusion apparatus, wherein the water-blocking assembly comprises the water-blocking sealing layer and the water-blocking tape;

uniformly distributing a plurality of reinforcing elements between a mold sleeve of the extrusion head and the mold core; and

extruding the outer protection layer between the mold sleeve and the mold core to form the overhead ribbon cable.

13 . The manufacturing method according to claim 12 , wherein the wrapping and forming the water-blocking sealing layer on the surface of the optical fiber ribbon array and the gap between two adjacent optical fiber ribbons specifically comprises:

enabling the optical fiber ribbon array to pass through a gluing apparatus, and filling and wrapping the surface of the optical fiber ribbon array and filling the gap between the two adjacent optical fiber ribbons with the sealant by the gluing apparatus; and

enabling the optical fiber ribbon array wrapped with the sealant to pass through a heating apparatus, and curing the sealant in the heating apparatus to form the water-blocking sealing layer.

14 . The manufacturing method according to claim 8 , wherein the after the optical fiber ribbon array wrapped with the water-blocking assembly and the outer protection layer is cooled and formed, performing pulling and take-up to form the overhead ribbon cable specifically comprises:

cooling, by a vacuum water tank and a cooling water tank, the optical fiber ribbon array wrapped with the water-blocking assembly and the outer protection layer.

15 . A manufacturing system for an overhead ribbon cable, wherein the manufacturing system is applied to the overhead ribbon cable according to claim 1 , the manufacturing system comprises a pay-off unit configured to form the optical fiber ribbon array, wherein an output end of the pay-off unit is sequentially connected to a gluing apparatus, a heating apparatus, an extrusion apparatus, and a cooling apparatus, and the optical fiber ribbon array sequentially passes through the pay-off unit, the gluing apparatus, the heating apparatus, and the extrusion apparatus at a same height.

16 . The manufacturing system according to claim 15 , wherein the cooling apparatus comprises a vacuum water tank and a cooling water tank which are sequentially connected with an output end of the extrusion apparatus.