64mmx220m Marine Hawser 8 Strand Polypropylene Multifilament Rope Mooring Rope for Shipowner/Ship Berthing

1.PHOTOS

2. Main performance

3.Technology Comparison

Coil length: 220m

Spliced strength:± 10% lower

Weight and length tolerance:± 5%

MBL=Minimum Breaking Load conform ISO 2307

Other sizes available upon request

4.Parameter Table

Production Process

Step 1: Raw Material Selection & Preparation

• Core Material Sourcing: High-grade marine-spec polypropylene (PP) chips are selected for their inherent water resistance, UV stability, and tensile strength—critical for withstanding harsh marine environments. The PP chips are screened to remove impurities (e.g., dust, foreign particles) that could weaken the final rope or cause structural flaws.
• Multifilament Precursor Production: The purified PP chips are fed into a melt extruder, heated to 180–230°C to form a molten polymer. This molten PP is extruded through a spinneret with hundreds of fine pores, producing continuous PP filaments. These filaments are then cooled rapidly (via air or water jets) to solidify, forming the base for PP multifilaments.

Step 2: Multifilament Spinning & Drawing

• Filament Bundling (Multifilament Formation): The cooled PP filaments are gathered into bundles (multifilaments) of uniform thickness. Each bundle is twisted slightly to enhance cohesion, preventing filament separation during subsequent processing.
• Drawing for Strength Enhancement: The PP multifilament bundles are pulled through a drawing machine at a controlled speed ratio (typically 3:1 to 5:1). This stretching process aligns the polymer molecules within the filaments, significantly boosting tensile strength and reducing elongation—key for meeting the load-bearing demands of ship mooring.
• Heat Setting: The drawn multifilaments are passed through a heat-setting tunnel (at 120–150°C) to stabilize their molecular structure. This step minimizes post-production shrinkage (critical for maintaining the 220m length accuracy) and improves resistance to temperature fluctuations in marine environments.

Step 3: Coloring (Optional, for Visibility)

• If required for marine safety (e.g., visibility in low light), UV-resistant pigments are integrated during the extrusion stage (mixed with molten PP) or applied as a uniform coating to the multifilaments. The coloring process ensures consistent hue across all filaments, with no fading under prolonged sun or saltwater exposure.

Step 4: Strand Formation (8-Strand Preparation)

• Multifilament Spooling: The drawn, heat-set (and colored, if applicable) PP multifilaments are wound onto large spools, each holding a precise length of multifilament to ensure uniform strand weight.
• Strand Braiding/Twisting: Eight identical spools of PP multifilament are fed into a specialized stranding machine. The machine twists or braids the multifilaments into eight independent, cylindrical strands—each with consistent diameter and tension. The strand density is calibrated to ensure the final rope reaches the 64mm target diameter, with each strand contributing equally to load distribution.

Step 5: Final Rope Braiding (8-Strand Construction)

• 8-Strand Braiding: The eight pre-formed strands are loaded onto a large braiding machine (with eight bobbins arranged in a circular pattern). The machine interlocks the strands in a tight, spiral braid—this 8-strand construction maximizes load-bearing capacity by distributing tension evenly across all strands, a critical feature for ship mooring (where sudden tugs from waves or wind are common).
• Diameter & Tension Monitoring: During braiding, laser sensors continuously monitor the rope’s diameter to ensure it stays within 64mm ± 0.5mm tolerance. Tension controllers adjust each strand’s feed rate to prevent slack or overstretching, ensuring structural uniformity.

Step 6: Length Cutting & Winding

• Precision Cutting: Once the braiding machine produces a continuous rope of 220m (verified via length counters), a high-torque cutting tool trims the rope to length, with heat-sealed ends to prevent fraying.
• Spooling for Transport: The 220m, 64mm rope is wound onto heavy-duty, marine-grade spools (typically made of reinforced plastic or steel) that can withstand the rope’s weight. The spooling process ensures the rope is coiled tightly without tangles, facilitating easy deployment during ship berthing.

Step 7: Quality Inspection & Testing

• Breaking Strength Test: Samples from each batch are tested on a tensile testing machine to verify compliance with marine hawser standards (e.g., minimum breaking strength for 64mm PP rope, typically 15–20 tonnes).
• Abrasion Resistance Test: The rope is rubbed against rough surfaces (simulating dock edges or ship hulls) for a set number of cycles to check for filament wear or strand fraying.
• Water & Saltwater Resistance Test: The rope is submerged in saltwater for 72 hours, then checked for weight gain (PP should absorb <1% water) and strength retention (minimum 95% of original breaking strength).
• Length & Diameter Verification: Random samples are measured to confirm 220m length and 64mm diameter accuracy.
• Only ropes passing all tests are packaged in moisture-proof, UV-resistant wrap for shipment to shipowners.

2. Application Scope

Core Application: Ship Berthing & Mooring for Commercial Vessels

• Large Cargo Ships & Tankers: Used as primary or auxiliary mooring lines for cargo ships (e.g., container ships, bulk carriers) and oil/gas tankers during berthing at ports or terminals. The 64mm diameter and 8-strand PP construction handle the extreme tension from the vessel’s weight (up to tens of thousands of tonnes) and wind/wave forces, keeping the ship securely anchored to docks or pilings.
• Ferries & Passenger Ships: Ideal for mooring ferries, cruise ships, or coastal passenger vessels. The rope’s flexibility allows it to conform to dock cleats and bollards, while its PP material resists saltwater corrosion—critical for daily berthing cycles in busy ports.
• Naval & Government Vessels: Used as mooring hawsers for naval ships, coast guard vessels, or research ships during port calls. The high breaking strength ensures security even in rough weather, and the rope’s low water absorption avoids weight gain that could complicate handling.

Port & Terminal Infrastructure Support

• Dock & Piling Securement: Used to reinforce temporary or permanent dock structures (e.g., floating docks, quay walls) by tying them to fixed pilings. The 220m length provides ample coverage for large dock spans, and the 8-strand design resists abrasion from constant contact with concrete or metal pilings.
• Barge Mooring: Secures barges (used for transporting goods, construction materials, or dredging equipment) to ports or to larger ships. The rope’s durability withstands the barge’s movement in tidal waters, preventing drift that could cause collisions.

Offshore & Coastal Operations

• Offshore Platform Tendering: Used to moor supply boats (tenders) to offshore oil rigs, wind farms, or drilling platforms. The PP multifilament’s resistance to saltwater and UV radiation ensures longevity in open-ocean environments, while the 64mm diameter handles the tender’s weight and wave-induced tension.
• Coastal Construction Projects: Employed in coastal engineering (e.g., pier construction, breakwater repair) to secure heavy equipment (e.g., cranes, concrete blocks) or to stabilize temporary work platforms. The rope’s high breaking strength supports heavy loads, and its flexibility allows for easy adjustment to changing work sites.

Emergency & Backup Applications

• Emergency Mooring for Stranded Vessels: Serves as a backup hawser for ships experiencing mooring line failure (e.g., due to storm damage). The 220m length allows quick deployment to nearby docks or tugboats, preventing the ship from drifting into hazardous areas (e.g., reefs, shallow waters).
• Tugboat Assistance: Used by tugboats to tow or stabilize disabled ships during berthing or emergency rescue. The rope’s 8-strand construction absorbs sudden shocks from the tugboat’s movements, protecting both the tug and the disabled vessel from damage.