Ship Mooring Rope Extrusion Line

Ship Mooring Rope Extrusion Line

A ship mooring rope extrusion production line is a highly specialized industrial equipment system. Its core function is to tightly and uniformly coat a high-strength synthetic fiber rope (such as polyester, polypropylene, nylon) or steel wire rope core with a layer of polymer sheath (mainly polyethylene PE or polypropylene PP) through a hot extrusion process.
This extruded sheath is the "protective armor" for the mooring rope. It is specifically designed to address the challenges mooring ropes face in harsh marine environments, effectively resisting seawater corrosion, UV radiation, wear, and friction with docks and hulls. Compared to unsheathed ropes, the plastic-coated mooring rope manufactured by this production line has a longer service life, higher safety, and better operational performance.
Main Characteristics of the Production Line:
Continuous Production: Integrates processes such as rope pay-off, preheating, extrusion, cooling, traction, and take-up into a continuous automated production line, resulting in high efficiency.
Efficient Coating: Molten plastic is forced through a precision die under high pressure, tightly combining with the rope core to form a uniform, dense protective layer with controllable thickness.
Strong Adhesion: Ensures excellent adhesion between the plastic sheath and the rope core through process control (such as preheating the rope core), preventing delamination or rotation during use.

Core Components of the Production Line

A complete ship mooring rope extrusion production line typically consists of the following key parts:
Pay-off System
Function: Supports and steadily releases the coil of rope to be coated.
Composition: Large spools or turntables, equipped with brakes and a tension control system to ensure a smooth pay-off process, constant tension, and avoid slackening or over-stretching.
Preheating System
Function: Heats the rope core before it enters the extruder head.
Importance: Preheating removes moisture from the rope core surface and raises its temperature. This helps the molten plastic adhere better to the rope core, reducing the risk of the sheath cracking or debonding after cooling due to different shrinkage rates.
Plastic Extruder
Function: The "heart" of the production line, responsible for plasticizing, melting, and steadily extruding the plastic raw material (e.g., PE/PP pellets).
Composition:
Hopper: For feeding plastic pellets.
Barrel and Screw: Core components. The screw rotation generates shear heat and, combined with external heating, melts, compresses, and homogenizes the plastic.
Heating/Cooling System: Precisely controls the temperature of each zone of the barrel.
Drive Motor: Provides power to the screw.
Extrusion Die
Function: A key component that determines the final size, shape, and coating quality of the sheath.
Composition: Typically uses a "crosshead" die. Its internal precision flow channels ensure the molten plastic coats the passing rope core uniformly and with high concentricity.
Cooling System
Function: Rapidly sets and solidifies the high-temperature molten plastic coated on the rope core.
Form: Usually one or multiple series-connected cooling water tanks. Staged cooling (e.g., spray then immersion) is used to control the cooling rate and prevent internal stress or deformation of the sheath caused by rapid cooling.
Traction System
Function: Provides stable, continuous pulling force for the entire production line, pulling the rope core forward at a constant speed.
Composition: Usually consists of one or multiple pairs of rubber tracks or wheels that grip the cooled plastic-coated rope, providing constant and adjustable linear speed. Its stability directly affects the uniformity of the sheath thickness.
Take-up System
Function: Winds the finished plastic-coated mooring rope neatly and tightly onto a spool.
Composition: Large take-up machine, equipped with a traverser (to arrange the rope neatly) and a tension control system to ensure winding quality, facilitating transportation and storage.
Electrical Control System
Function: The "brain" of the production line.
Composition: PLC (Programmable Logic Controller), HMI (Touch Screen), temperature controllers, frequency converters, etc. It integrally controls the start/stop of all equipment, speed synchronization, and process parameters (such as temperature), enabling automated production and precise monitoring.

Ship Mooring Rope Extrusion Line Datasheet

Model	30	40	50	60	70	80	90
Screw Diameter (mm)	φ30	φ40	φ50	φ60	φ70	φ80	φ90
Screw L/D Ratio	25:1	25:1	26:1	26:1	26:1	26:1	26:1
Extrusion Amount (kg/hr)	25	40	70	100	140	200	250
Outlet Wire (mm)	0.2-1	0.4-3	0.8-5	1-8	2-15	3-25	5-35
Total Power (KW)	18	20	25	33	40	55	63
Traction Power (KW)	2.2	2.2	4	4	4	5.5	5.5
Production Speed (m/min (Max.))	600	600	600	500	500	300	300
Take-up Spool (mm)	φ200-400	φ300-500	φ400-630	φ400-630	φ500-630	φ800-1000	φ1000-1250

Ship Mooring Rope Extrusion Line Application

The ship mooring rope extrusion production line is key equipment for enhancing the comprehensive performance of mooring ropes and ensuring the safety of ship berthing. The plastic-coated mooring rope it produces, by providing a sturdy "protective armor," significantly improves the product's durability and reliability in harsh marine environments, reducing maintenance costs and safety risks. The plastic-coated mooring rope manufactured by this production line, due to its excellent performance, has become the standard configuration in modern shipping and port operations:
Core Application: Ship Mooring
Function: Used to securely fasten ships to docks, buoys, or other offshore structures (such as platforms).
Advantages:
Excellent Corrosion and Wear Resistance: The plastic sheath effectively resists erosion from seawater and salt spray, as well as friction from docks and ship fairleads, greatly extending the rope's service life.
UV Resistance: Specialized sheath materials (like PE) effectively slow down aging caused by sunlight UV radiation, making them suitable for long-term outdoor environments.
Enhanced Visibility and Safety: The sheath can be made in bright colors (e.g., orange, yellow), improving the rope's visibility in complex environments and preventing accidents like tripping. Simultaneously, the sheath can prevent fragments from flying if the core breaks due to wear, enhancing safety.
Ease of Operation: The plastic coating makes the rope surface smoother, reduces kinking during use, and facilitates handling and coiling.
Internal Protection: For synthetic fiber cores, the sheath effectively prevents seawater ingress, microbial growth, and chemical contamination, maintaining the mechanical properties of the core.