Product Specification

3-Strand Twisted Nylon Anchor Line Used Marine Rope for Ship and Boat

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. Nylon Fiber Extrusion & Drawing: High-quality marine-grade nylon pellets are melted and extruded into continuous filaments through specialized extrusion machines. These filaments are then drawn (stretched) to align the polymer molecules, enhancing their tensile strength and durability—critical properties for withstanding marine loads. The drawn filaments are cooled and wound onto spools to form "tow," the base material for rope strands.
2. Strand Spinning (Yarn Formation): The nylon tow is twisted into yarns of consistent thickness. Multiple yarns are then combined and twisted again to form individual "sub-strands." This double-twisting process adds stability to the material, ensuring it resists fraying during subsequent steps. The number of yarns per sub-strand is calibrated based on the desired strength and diameter of the final anchor line.
3. 3-Strand Twisting: Three identical sub-strand bundles are fed into a large twisting machine (strander). The machine rotates the three bundles in a controlled, uniform manner—twisting them together to form the core structure of the 3-strand rope. The twist rate is carefully adjusted: too loose, and the rope lacks stability; too tight, and it becomes rigid. This step creates the characteristic twisted pattern of 3-strand rope, optimizing load distribution.
4. Heat Setting & Stabilization: The newly twisted 3-strand rope is passed through a heat-setting oven or chamber. Heat is applied at a precise temperature (compatible with nylon’s thermal properties) to "lock in" the twist, preventing the rope from unraveling or losing its shape over time. This step also reduces residual stress in the fibers, enhancing the rope’s long-term structural stability, especially under repeated tension (e.g., anchor loads).
5. Surface Treatment & Quality Inspection: The heat-set rope undergoes surface treatment to boost marine performance: a UV-resistant coating is applied to prevent sun-induced brittleness, and a water-repellent finish (compatible with nylon) minimizes moisture absorption. After treatment, the rope is inspected for defects—including uneven twisting, fiber breaks, or coating gaps—using tension tests, diameter measurements, and visual checks. Qualified ropes are then cut to standard lengths, coiled, and packaged for shipping.

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• Key Features

• Reliable Tensile Strength for Marine Loads: The 3-strand twisted structure distributes tension evenly across all strands, while marine-grade nylon’s inherent fiber strength ensures the anchor line can withstand heavy, dynamic loads—such as the pull of tides, wind-driven ship movement, or anchor retrieval. It maintains structural integrity even under prolonged stress, reducing the risk of sudden failure during anchoring.
• Controlled Elasticity & Shock Absorption: Nylon’s natural elasticity, amplified by the 3-strand twisted design, allows the anchor line to stretch slightly when subjected to sudden shocks (e.g., wave impacts or abrupt vessel shifts). This stretch dissipates impact forces, protecting both the rope and the ship/boat’s anchor system (cleats, winches) from damage—critical for safe anchoring in rough seas.
• Superior Saltwater & Moisture Resistance: Marine-grade nylon is inherently hydrophobic, and the tight 3-strand twist minimizes gaps where saltwater or moisture can accumulate. Unlike ropes prone to water absorption, this anchor line does not swell, rot, or degrade when submerged or exposed to salt spray. It retains its strength and flexibility even after long-term use in coastal or offshore environments.
• Abrasion Resistance for Seabed & Deck Contact: The twisted 3-strand structure creates a dense, rugged outer surface that resists wear from contact with rough seabeds (sand, rocks, coral) during anchor deployment, or from friction against ship decks, metal cleats, or dock edges. It withstands repeated abrasion without fraying or losing strands, extending its service life in harsh marine conditions.
• Easy Handling & Knot Stability: The 3-strand twisted design balances durability with flexibility, making the anchor line easy to coil, deploy, and tie into secure marine knots (e.g., bowline, cleat hitch). It conforms smoothly to anchor hardware (e.g., shackles, windlasses) and maintains knot tightness even when exposed to moisture or slight tension shifts—ensuring the anchor stays securely set.

• Application Scope

• Small to Medium Recreational Boats: Ideal for anchoring recreational vessels such as fishing boats, sailboats, and motorboats (6–25 meters in length). Its manageable weight and flexibility suit casual use (e.g., overnight mooring in lakes, bays, or coastal coves), while its saltwater resistance ensures reliability for both freshwater and saltwater trips.
• Commercial Small Ships & Workboats: Used as anchor lines for small commercial vessels, including tugboats (for auxiliary anchoring), fishing trawlers (for short-term anchoring during catches), and harbor patrol boats. It provides the strength needed to secure these vessels in busy harbors or near fishing grounds, while its shock absorption protects against sudden currents.
• Yachts & Luxury Vessels: Suitable for yachts (20–40 meters) as primary or backup anchor lines. Its smooth twisted surface minimizes damage to yacht decks or delicate hardware, and its UV resistance maintains appearance and performance during long-term mooring in sunny coastal areas (e.g., Mediterranean marinas, Caribbean bays).
• Coastal Cargo Vessels (Light-Duty): Used for light-duty anchoring of small coastal cargo ships (e.g., vessels transporting local goods, such as food or building materials, along coastlines). It secures these ships during loading/unloading at small ports or temporary stops, where heavy-duty steel cables may be unnecessary.
• Emergency Anchoring for All Vessels: Serves as a reliable emergency anchor line for ships and boats of all sizes. In scenarios like engine failure or unexpected storms, its easy deployment and strong load-bearing capacity provide temporary stability, allowing crews to address issues or wait for assistance without risking drift.