Optical Cable Secondary Coating Line

Optical Cable Secondary Coating Line

  • Payment Terms T/T, L/C, D/P, etc.
  • Delivery Time 90 days
  • Place of Origin China
  • Port of Loading Shanghai, China
  • Shipping By sea
  • HS Code 8479400000
  • Container Load
  • Warranty Period 12 months

Product Details

Main Components

Commercial Parts


Product Details

1. Introduction

The secondary coating of optical fiber is to coat the outer surface of the optical fiber once, and then squeeze the loose tube with a certain diameter and a certain thickness. The primary coated fiber can move freely in the loose tube, and the loose tube is filled with water blocking ointment.
The secondary coating of the optical fiber is the second layer of protection for the optical fiber after the primary coating and coloring. The optical strength of the optical fiber after one-time coating is still low, and it cannot be used without further reinforcement. The purpose of the secondary coating operation is to protect the primary coating of the optical fiber, increase the mechanical strength of the optical fiber, and improve the transmission characteristics and temperature characteristics of the optical fiber.
This is one of the most important processes in the manufacture of optical cables, and its quality directly affects the performance indicators of finished optical cables.
We have many years of experience in research and development and manufacture of optical fiber and cable production equipment. The optical cable secondary coating line provided by us can be used to extrude 2-12 cores grease filled fiber optic loose tube, suitable for extruding PBT material. The extruded shape is round, uniform in diameter and smooth.
The whole line adopts the control technology (PC + PLC mode) which combines industrial control computer and programmable logic controller.
As the main control system, PLC realizes the linkage control of the whole line. The operator can select the stop, slow, and fast running states through the interface. The production line will automatically switch between the three states according to the operating instructions and the various state signals of the equipment. There is no sudden change in the speed-up and speed-down time. It can automatically respond to various fault signals and have clear fault indications. The production speed and metering data are clearly displayed, and the meter length can be pre-designed.
The industrial computer realizes human-machine data exchange and production data recording. The man-machine interface provided by IPC includes production interface, curve interface, and recipe interface. The human-computer interaction interface is friendly and easy to operate.

2. Main Technical Parameters



Number of fiber cores


Payoff tension(N)


Payoff bobbin(mm)


Structure speed(m/min)


Production speed(m/min)


Surplus length control


Takeup bobbin(mm)


Additional loss(dB/km)


Outer diameter of beam tube(mm)


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    Main Components

    The equipment is mainly composed of optical fiber pay-off unit, bubble removal grease filling device, extrusion unit and auxiliary machine, constant temperature water sink and water tank, surplus length traction unit, three-wheel tension device, cold water system and traction device, blow drying device, diameter gauge, a wire storage type tension controller, a dual type automatic switching takeup and traversing unit, an electronic control system, etc.

    1. Fiber Optic Pay-off

    Optical Fiber Pay-off UnitActive pay-off unit is adopted.
    A cabinet contains 6 fiber pay-off heads, and two pay-off cabinets can provide up to 12 fiber pay-offs at one time. The pay-off shaft is heat-treated with wear resistance, and all guide wheels are treated with hard anodizing; the fiber disc lock is structured in the form of spring balls to ensure the safety and reliability of high-speed fiber pay-off. The device also has a fiber optic fiber break alarm speed reduction function.

    2. Gel Filling and Bubble Remover

    The Bubble Removal Grease Filling DeviceThere will be bubbles during the production, transportation and filling of the ointment. Due to the presence of air bubbles, firstly, the outer diameter of the loose tube will be uneven, and secondly, the presence of air will affect the filling degree of the ointment. Therefore, the grease must be degassed before filling, to ensure that the gap between the loose tube and the optical fiber is filled with grease to the maximum extent.
    The device uses a squeeze-type bubble removal method. The device has good degassing effect, and after treatment, it can ensure that there is no visually measurable size bubbles and solid debris.

    3. Extruder and Auxiliary Machine

    Extrusion Unit and Auxiliary MachineMainly include extruder, crosshead and dies, oil filling needle tube system, drying system, feeding system, masterbatch system, etc.
    Use self-centering adjustable crosshead. The crosshead and the barrel are connected by movable opening and closing. The imported temperature controller + thermocouple + solid state relay controls the temperature. The real-time digital display sets and detects the temperature.
    The specially designed extrusion screw is suitable for the extrusion of PBT material, which can ensure that the extrusion shape is round, uniform in diameter and smooth.

    4. Surplus Length Traction

    Surplus Length Traction UnitThe traction wheels are welded with stainless steel, and have dynamic balance correction. It has three operating states: stop, slow, and fast, which can automatically switch between the three states according to the operation instructions and the various status signals of the device. The speed changes according to the set up and down time, without mutation. Equipped with meter counting. The traction wheels are installed in a stainless steel welded water tank, which are cooled by a warm water sprinkler, equipped with an open and close door, with an observation port, and the returned hot water is pumped to the hot water tank. The device can play the role of controlling the excess length of optical fiber in the loose tube.

    5. Full-automatic Double Spooler

    Dual type automatic switching take-up and traversing unitThe whole dual type take-up with traverser device adopts a box structure, which is mainly composed of a take-up unit, bobbin lifting and clamping unit, traversing unit, lateral movement mechanism, a wire catching and cutting mechanism and a frame. It is suitable for PN630 and PN800 bobbins, and with compact structure and small footprint.
    The overall frame is made of welded profiles, with a firm and beautiful appearance. Plexiglas is installed in the window to facilitate the observation of production and operation.

    Commercial Parts

    1. The temperature control instrument adopts Omron brand;
    2. PLC adopts Siemens brand;
    3. AC frequency conversion motor adopts Panasonic brand;
    4. The inverter adopts Danfoss brand;
    5. The intermediate relay adopts Omron brand;
    6. Low-voltage electrical appliances adopt Siemens brand.


    Q: Can I visit your factory?

    A: All the customers from both home and abroad are warmly welcomed to visit our company and factory.

    Q: Do you supply the installation and commissioning?
    A: Yes, we do as followings:
    -As soon as customer informed us the machines are put in the right place, we will send both mechanical and electrical engineer for machine start up.
    -No-load testing: After machine installed completely, we make no-load testing first.
    -With-load testing: Usually we will can produce 3 different wires to make load testing.

    -Acceptance report: After the buyer confirms that machine can reach all specification under contract, the acceptance report will be signed for our record that machine will be in guarantee period.

    Q: What information should I offer to get a detailed quotation from you?
    A: For single machine: Usually we need to know inlet wire size, outlet wire size to be produced, productivity, pay off and take up size to choose the right machine.
    For new cable plant or new cable production line, we need to know the datasheet of cables to be produced, the productivity, the standards to be followed, etc to design all machines needed.

    Q: Can you supply the auxiliary equipment along with the machines?
    A: Yes, definitely.
    We has supplied heat exchanger, copper/aluminum powder filter machine, cooling tower, chiller, air compressor, drawing dies, pointing machine, cold welders, bobbins etc. with our machines.

    Q: Could you do the design for the whole plant?
    A: Yes, this is our advantage.
    With the data sheet of cable to be produced, the standard your cables should follows, the productivity you expected. Our engineer on production technology and machinery will make design of production machines, test equipment, accessories like bobbins, dies, rewinding lines and materials needed.

    Q: How can I know the status of my order?
    A: We have our OA system on tracking the production.
    For any of your request we can send photos and videos of your order, also we can use FACETIME to let you know the production.

    Q: How do you work on the inspection before delivery?
    A: We will make dynamic balance testing, levelness testing, noise testing, etc. during production.
    After production finished, usually we make no-load running of each machine before delivery. Customers are welcomed to attend the inspection.

    Q: What exhibitions will you attend, can we meet in the fair?
    A: Dusseldorf International Wire and Cable Fair;
    Wire South America Fair;
    International Wire and Cable Fair in Shanghai;
    International Istanbul Wire Fair, etc.
    wire Southeast Asia Fair, etc.

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