Product Specification

3-Strand Polyester Twist Rope Black Gold White 5mm 6mm Marine Ropes in Packaging High Strength Feature

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

1. Polyester Fiber Selection & Preparation
   High-tenacity polyester chips (optimized for marine use) are melted and extruded into continuous filament fibers. These fibers are chosen for their inherent strength, UV resistance, and saltwater tolerance—key properties for high-strength marine ropes. The fibers are then stretched and heat-set to enhance tensile strength and reduce post-production shrinkage. Before coloring, fibers undergo cleaning to remove impurities that could weaken the final rope.
2. Fiber Coloring (Black, Gold, White)
   The prepared polyester fibers are dyed using marine-grade, fade-resistant pigments to achieve the specified black, gold, and white hues. For white ropes, a brightening agent may be added to maintain whiteness against UV exposure. The dyeing process uses high-temperature, pressure-stabilized techniques to ensure color penetration deep into the fiber (preventing surface fading) and adherence—critical for retaining color in saltwater, sun, and rain.
3. Strand Spinning
   Dyed polyester fibers are grouped into yarns of consistent thickness. Multiple yarns are then twisted together to form three individual strands (the "3-strand" core of the rope). The twisting tension is precisely controlled: too little twist reduces strength, while too much causes brittleness. For 5mm and 6mm diameters, the number of yarns per strand is calibrated (fewer for 5mm, slightly more for 6mm) to ensure the final rope meets diameter and high-strength requirements.
4. 3-Strand Twisting (Final Rope Formation)
   The three pre-spun strands are fed into a twisting machine at a synchronized speed. They are twisted together in a clockwise or counterclockwise direction (depending on marine industry standards for knot retention) to form the final 3-strand twisted rope. The twisting process compacts the strands tightly, enhancing load distribution and abrasion resistance—directly contributing to the rope’s "high strength" feature. During this step, diameter is monitored in real time to ensure consistency (5mm ±0.1mm, 6mm ±0.1mm).
5. Heat Setting & Post-Treatment
   The twisted rope is passed through a heat-setting oven to stabilize its structure. This step locks in the twist, prevents unraveling, and further strengthens the polyester fibers by aligning their molecular structure. After cooling, the rope undergoes a surface treatment (e.g., a clear, water-based coating) to boost abrasion resistance and reduce friction—essential for marine use where the rope contacts docks, hulls, or metal cleats.
6. Quality Inspection & Packaging
   Each rope is inspected for key metrics: tensile strength (tested to ensure it meets marine high-strength standards), diameter uniformity, color consistency, and absence of defects (e.g., frayed strands, uneven twist). Qualified ropes are then cut into standard lengths (e.g., 20m, 50m, 100m) or customized lengths per requirements. They are coiled neatly and packaged in moisture-resistant materials (e.g., polypropylene bags, cardboard boxes with plastic liners) to protect against dust, moisture, and damage during storage and transportation.

2. Application Scope

Marine Vessel Use (Small to Mid-Sized Watercraft)

• Dock Lines for Small Boats & Kayaks: The 5mm/6mm diameter is lightweight enough for kayaks, canoes, and small fishing boats, while high strength secures vessels to docks or buoys. Black and white options offer low-visibility (black) or high-visibility (white) for different lighting conditions; gold adds a decorative touch for recreational boats.
• Anchor Lines for Paddlecraft & Dinghies: Ideal for anchoring lightweight watercraft in calm lakes, bays, or coastal inlets. Its strength withstands mild currents, and polyester’s saltwater resistance prevents degradation from submersion.
• On-Deck Gear Securement: Used to tie down small equipment (e.g., life jackets, fishing tackle boxes, fenders) on boat decks. The twisted structure holds knots securely, and the rope’s flexibility allows it to conform to gear shapes without scratching surfaces.

Recreational Marine Activities

• Water Sports Tow Ropes (Light-Duty): Suitable for towing small inflatables (e.g., kids’ floaties, mini tubes) or as a backup tow rope for water skiing (for lightweight users). The high strength handles moderate pulling forces, and color options (e.g., gold) improve visibility on water.
• Swimming Area Markers: White or gold ropes are used to define temporary swimming zones in marinas, lakes, or coastal beaches. Their bright colors make boundaries visible to boaters, while polyester’s weather resistance ensures longevity in outdoor use.

Marina & Dock Maintenance

• Temporary Barriers & Safety Lines: Black or white ropes create temporary barriers (e.g., around construction zones on docks, or to block off unsafe areas). The 5mm/6mm diameter is easy to install and remove, and high strength prevents breakage from accidental impacts.
• Dinghy & Paddleboard Storage: Used to hang or secure dinghies/paddleboards on marina racks. The rope’s strength supports the weight of the watercraft, and its resistance to UV and moisture prevents rot or weakening over time.

Coastal & Lakefront Property Use

• Shoreline Gear Tying: For lakefront cabins or coastal homes, the rope secures items like small boats, jet skis, or dock furniture (e.g., Adirondack chairs) to shorelines. Its durability withstands exposure to salt spray (coastal) or freshwater (lakes) and fluctuating weather.
• Decorative Marine Accents: Gold and white ropes are used for decorative purposes (e.g., wrapping around dock railings, framing outdoor seating areas) in coastal-themed properties. They retain color and strength while adding aesthetic value.