8 or 12 Strands UHMWPE PP Danline Floating Mooring Rope for Ship Marine

1. General Description

QINGDAO JINCHENG MARITIME has serial products including varieties of nylon, polypropylene filament, polypropylene, polypropylene /polyester mixed, polyester. It started a new epoch of rope and cable industry in the country and its products have advantages of reasonable braided structure, scientific technology, high strength, low elongation,wearing resistance, anti-corrosion and simple operation, it is particularly suitable to make large scale ropes and cables as well as anti -static ropes therefore they are well received by broad customers, The products are mainly used in fields of shipbuilding, ocean transportation, national defense and military industry, sea petroleum and harbor operation etc.

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 & Pre-Mixing

• UHMWPE (Ultra-High Molecular Weight Polyethylene) fibers: Chosen for exceptional tensile strength and abrasion resistance, critical for marine load-bearing.
• PP (Polypropylene) resin: Selected for natural buoyancy (key for floating functionality) and moisture resistance.
• Danline-specific additives: Include UV stabilizers (to combat marine sunlight exposure) and anti-aging agents (to prevent degradation from saltwater).

Step 2: Fiber-Yarn Formation (Core & Outer Layer Prep)

• UHMWPE-reinforced PP yarn (core): The molten PP-additive mixture is extruded around the pre-cut UHMWPE fibers, forming continuous composite yarns. These yarns are drawn (stretched) to align polymer molecules, boosting tensile strength, then cooled in a water bath to solidify.
• PP outer yarn: Pure PP resin (with UV stabilizers) is extruded into thin filaments, bundled, and twisted into yarns—these form the outer layer of each strand, enhancing buoyancy and surface durability.

Step 3: Strand Braiding (8 or 12-Strand Formation)

• For 8-strand ropes: 8 spools of UHMWPE-PP core yarn (as the strand’s core) and 8 spools of PP outer yarn (as the strand’s sheath) are fed into a circular braider. The machine weaves the PP outer yarn tightly around the core, forming dense, uniform 8 strands.
• For 12-strand ropes: The process is scaled to 12 spools of core yarn and 12 spools of outer yarn, with adjusted braiding tension to maintain consistency across more strands.
  Each strand is wound onto large spools after braiding, with tension controlled to avoid tangling or deformation.

Step 4: Final Rope Braiding & Floating Calibration

• The machine braids the strands in a double-braided or single-braided pattern (depending on load requirements): Double braiding adds an extra layer of durability for heavy ships, while single braiding optimizes flexibility for smaller vessels.
• During braiding, buoyancy is calibrated: The PP content (which drives floatation) is monitored to ensure the rope remains fully buoyant in saltwater—tests are conducted mid-production to confirm it does not sink when submerged.

Step 5: Post-Processing & Quality Inspection

• Surface Treatment: The finished rope undergoes a smooth coating process (using PP-based wax) to reduce friction—critical for preventing wear when the rope rubs against ship hulls or dock pilings.
• Cutting & Spooling: The rope is cut to standard marine lengths (e.g., 50m, 100m) and wound onto marine-grade spools (resistant to saltwater corrosion).
• Quality Checks: Rigorous tests are performed, including:
  • Tensile strength testing (to meet ship mooring load standards).
  • Abrasion resistance testing (simulating contact with rocks or metal).
  • Buoyancy testing (submersion in saltwater for 24 hours to confirm floatation).
  • UV resistance testing (exposure to simulated sunlight to check for brittleness).

2. Application Scope

Marine Ship Mooring (Core Application)

• Large Commercial Ships: Used as mooring lines for cargo ships, tankers, and container vessels (5,000+ DWT) when berthing at ports or docks. The UHMWPE’s high strength withstands the ships’ weight and tide/wind forces, while buoyancy prevents the rope from sinking and getting tangled in underwater obstacles (e.g., anchors, seabed debris).
• Mid-Sized Vessels: Ideal for ferries, cruise ships, and fishing trawlers—its flexibility allows easy tying to bollards or cleats, and the 8/12-strand structure ensures even load distribution during rough weather.
• Yachts & Recreational Boats: For luxury yachts or sailboats, the rope’s lightweight (compared to traditional steel cables) and buoyancy make it easy to handle, while its UV resistance maintains performance during long-term mooring in coastal marinas.

Offshore & Coastal Operations

• Offshore Platform Mooring: Used to secure temporary offshore platforms (e.g., oil exploration support platforms, fish farming cages) to the seabed. Its saltwater resistance prevents degradation, and buoyancy ensures the rope stays visible on the water surface for maintenance checks.
• Coastal Rescue Vessels: Employed as mooring lines for lifeboats or rescue ships during emergency operations. The rope’s floatation allows rescuers to easily locate it in rough seas, and its high strength ensures the rescue vessel remains stable while retrieving survivors.

Dock & Marina Infrastructure

• Dock Stabilization: Used to secure floating docks or piers to fixed pilings in coastal marinas. The 8/12-strand braiding resists abrasion from dock movement (caused by waves), and buoyancy prevents the rope from dragging on the seabed and wearing down.
• Temporary Mooring for Visiting Vessels: Provided as rental mooring lines in marinas for boats staying short-term (1–7 days). Its durability handles frequent tying/untieing, and its floating design reduces the risk of the rope getting caught in boat propellers.

Specialized Marine Tasks

• Ship-to-Ship Transfer: Used as "breast lines" to keep two ships aligned during cargo transfer (e.g., fuel or food resupply at sea). The rope’s flexibility absorbs slight ship movements, while strength prevents separation during transfer.
• Underwater Construction Support: For marine construction projects (e.g., building jetties or underwater pipelines), the rope is used to secure equipment (e.g., dredgers, concrete blocks) to floating barges. Its buoyancy keeps the rope accessible, and UHMWPE strength withstands the weight of heavy construction materials.

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