Product Specification

High Strength Polypropylene 3 Strand Twisted PE Twine Nylon Marine Rope PP Rope

Production Process

Step 1: Material Preparation & Fiber Extrusion

• Polypropylene (PP) Fiber Extrusion: High-melt-index PP pellets (selected for tensile strength) are melted in an extruder at 180–220°C. The molten PP is extruded through spinnerets to form continuous filaments, which are then drawn (stretched) to align polymer chains—enhancing strength and reducing permanent elongation.
• PE Twine Manufacturing: Low-density polyethylene (LDPE) or linear low-density polyethylene (LLDPE) pellets are extruded into thin filaments, which are twisted into fine twine. This twine is engineered for flexibility and impact resistance, serving as a reinforcing layer.
• Nylon Fiber Extrusion: Marine-grade nylon pellets (nylon 6 or 6,6) are melted and extruded into filaments, then drawn to boost abrasion resistance and elasticity—critical for marine durability.

Step 2: Yarn Spinning & Strand Assembly

• PP filaments are twisted into thick yarns (the core load-bearing component). These PP yarns are wrapped with PE twine to add structural cohesion and buffer against friction.
• Nylon filaments are twisted into yarns and combined with the PP-PE core to form three separate "composite strands." Each strand is twisted in a consistent direction (e.g., S-twist) to ensure uniformity, with tension controlled to avoid strand distortion.

Step 3: 3-Strand Twisting (Closing)

Step 4: Post-Treatment for Marine Performance

• Coating Application: The rope is coated with a marine-grade finish (containing UV inhibitors and anti-fouling agents) to resist sunlight degradation and saltwater corrosion.
• Heat Setting & Washing: It is heat-treated to stabilize the twist (preventing shrinkage in water) and washed to remove manufacturing residues.
• Cutting & End Sealing: The continuous rope is cut to custom lengths (per application needs). Both ends are heat-sealed or crimped to prevent fraying. A final quality check verifies tensile strength, diameter consistency, and surface integrity.

Key Features

• Exceptional Strength-to-Weight Ratio: The PP core provides high tensile strength (supporting heavy loads), while PE and nylon layers add reinforcement without excessive weight. This makes the rope lightweight for easy handling (critical for marine tasks like anchoring) while maintaining the load-bearing capacity needed for small to mid-sized vessels.
• Superior Water & Saltwater Resistance: PP is inherently hydrophobic (repels water), PE resists moisture absorption, and nylon withstands saltwater corrosion. The composite structure prevents water retention, rot, or mildew—even after prolonged submersion—avoiding weight gain and performance loss in marine environments.
• Abrasion & Impact Resistance: The nylon outer layer acts as a protective barrier against friction (e.g., from dock edges, rocky seabeds, or boat hardware), while PE twine absorbs impacts (e.g., wave-induced jolts). This durability minimizes fraying and strand damage, extending the rope’s service life in high-wear scenarios.
• Controlled Flexibility & Knot Retention: The 3-strand twisted design balances rigidity (for load stability) and flexibility (for easy knot-tying). It bends smoothly to form secure knots (e.g., bowline, cleat hitch) that stay tight under dynamic loads (e.g., wind or waves), reducing the risk of slippage.
• UV & Weather Durability: The UV-inhibitor coating, paired with PP and nylon’s natural resistance to sunlight, prevents brittleness, discoloration, or strength loss from prolonged outdoor exposure. It tolerates temperature fluctuations (from hot coastal days to cold winter waters) without degrading.

Application Scope

• Marine Anchoring & Mooring: Ideal as anchor lines or mooring lines for small to mid-sized boats, sailboats, and recreational watercraft. Its strength holds vessels in place against wind/waves, while water resistance ensures reliability in coastal, lake, or offshore settings.
• Light-Duty Marine Towing: Used to tow dinghies, jet skis, or inflatable toys behind larger vessels. Its lightweight design eases deployment, and impact resistance cushions sudden tugs—protecting both the towing and towed craft.
• Outdoor & Recreational Use: Suitable for camping (securing tents/tarps), fishing (tying gear or setting nets), or water sports (as tow ropes for wakeboarding). Its weather resistance stands up to rain, sunlight, and moisture in outdoor environments.
• Agricultural & Light Industrial Tasks: Used in farming (tying hay bales, securing livestock enclosures) or light construction (bundling materials, temporary barriers). Its strength handles moderate loads, and water resistance works for outdoor agricultural settings.
• Waterfront Infrastructure: Employed in marinas or docks to secure floating platforms, small buoys, or fenders. Its abrasion resistance withstands contact with dock hardware, while saltwater resistance ensures long-term performance in waterfront installations.
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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