Product Specification

High Strength Polysteel Twisted PP Rope for Fishing Marine for Boat Pot Winches Docking

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 Preparation & Melting
  High-quality polypropylene (PP) resin pellets are selected as the base material, combined with reinforcing "polysteel" components (typically high-tensile synthetic fiber blends or fiber-reinforced PP additives to enhance strength). The mixed raw materials are fed into an extruder, where they are heated to a molten state (around 180–220°C) under controlled temperature. This melting process ensures the PP resin and polysteel components fuse uniformly, forming a homogeneous molten polymer.
• Step 2: Fiber Extrusion & Cooling
  The molten polymer mixture is pushed through a spinneret (a metal plate with hundreds of tiny holes) to form continuous, thin PP-polysteel composite filaments. These filaments are immediately drawn through a water cooling bath or air-cooling system to solidify quickly, preventing thermal degradation and maintaining fiber integrity. After cooling, the filaments are pulled slightly (a process called "drawing") to align the polymer molecules, further boosting their tensile strength.
• Step 3: Filament Bundling & Spooling
  The cooled, drawn filaments are gathered into larger bundles (called "yarns" or "strands") with consistent thickness. Each bundle is wound onto large spools using automated spooling machines, ensuring even tension to avoid filament tangling or breakage. These spools of PP-polysteel yarn serve as the raw material for rope twisting.
• Step 4: Twisting (Strand Formation)
  Multiple spools of PP-polysteel yarn are mounted on a twisting machine. The machine rotates the yarns in a controlled direction (either S-twist or Z-twist) to twist them into individual strands. For high-strength performance, the twisting tension and rotation speed are precisely calibrated—tighter twists enhance strand density and load-bearing capacity, while avoiding over-twisting that could cause brittleness. This step produces the foundational strands of the rope.
• Step 5: Rope Construction (Final Twisting)
  The pre-twisted PP-polysteel strands are loaded onto a secondary twisting machine (or a stranding machine) to form the final rope. Depending on the desired rope diameter and strength, multiple strands (e.g., 3, 4, or more) are twisted together in the opposite direction of their individual twist (a process called "counter-twisting"). This counter-twist balances the rope’s internal tension, preventing it from unraveling and ensuring structural stability. The machine controls the twist rate to achieve the specified "twisted" texture and strength.
• Step 6: Post-Processing & Quality Inspection
  The finished rope is cut to standard lengths using automated cutting equipment. It then undergoes post-processing treatments: a surface smoothing process to reduce friction (critical for winch and docking use) and a UV-resistant coating (optional but common for marine applications to prevent sun-induced degradation). Finally, quality inspection is conducted—tests include tensile strength measurement, abrasion resistance checks, and dimensional verification—to ensure the rope meets high-strength marine and fishing standards.

Application Scope

• Fishing Industry
  • Used as fishing net ropes (to reinforce net edges or connect net panels) for both inshore and offshore fishing. Its high strength withstands the weight of large catches (e.g., tuna, cod) and resists abrasion from underwater rocks or coral.
  • Serves as mooring ropes for fishing vessels when anchored at fishing grounds, and as tow ropes for pulling small fishing skiffs or auxiliary equipment (e.g., bait tanks) behind larger fishing boats.
  • Ideal for securing fishing gear (e.g., traps, pots, or lines) to buoys, as it resists saltwater corrosion and maintains tension even in rough seas.
• Marine General Use
  • Functions as general-purpose marine ropes for small to medium-sized vessels, including tie-down ropes for on-deck cargo (e.g., fuel cans, fishing supplies) and temporary mooring lines for short stops at coastal harbors.
  • Used as safety lines (e.g., for securing crew members during deck work) or as barrier ropes to mark restricted areas on boats or docks, thanks to its durability and weather resistance.
  • Suitable for floating marker lines (to mark navigation channels or hazard zones in shallow waters), as PP’s natural buoyancy keeps the rope afloat, ensuring visibility.
• Boat Pot Winches
  • Specifically designed for use with boat pot winches (common in crab, lobster, or shellfish fishing). The rope’s high tensile strength handles the mechanical pull of winches when lifting heavy pots from the seabed, while its twisted structure ensures smooth winding and unwinding on winch drums (reducing friction and wear on both the rope and winch).
  • Resists stretching under the weight of loaded pots, ensuring precise control during winching operations, and its resistance to saltwater and winch grease prevents degradation from contact with winch components.
• Docking & Mooring
  • Used as docking lines for recreational boats (e.g., sailboats, speedboats) and small commercial vessels (e.g., ferry boats, tour boats) when berthing at docks or marinas. Its strength secures vessels against wind and tide forces, while its flexibility allows easy tying to cleats or bollards.
  • Functions as spring lines (to control a boat’s forward/backward movement during docking) and breast lines (to keep the boat parallel to the dock), as it maintains knot stability and resists abrasion from dock edges or concrete pilings.
  • Suitable for temporary or semi-permanent mooring in calm to moderately rough waters, as it retains performance in exposure to rain, sun, and salt spray.