3/4/8 Strands Nylon Rope Twine Packing Thread Plastic String Cord Twisted Polyamide Nylon Rope

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. Polyamide (Nylon) Resin Melting & Extrusion: First, high-quality polyamide (nylon) resin pellets are fed into an extruder. The extruder heats the pellets to a molten state (typically at 220–260°C, depending on nylon type) and pushes the molten nylon through small, precision-engineered spinnerets. This process creates continuous, thin nylon filaments— the basic building blocks of the rope.
2. Filament Cooling, Stretching & Heat Setting: The extruded nylon filaments are immediately cooled with air or water to solidify them. Next, the solidified filaments undergo a stretching process (draw ratio varies based on desired strength) to align the polymer molecules, enhancing the filament’s tensile strength and durability. After stretching, the filaments are heat-set (heated at a controlled temperature without melting) to lock in their structure, preventing shrinkage in later use.
3. Strand Formation via Twisting: The processed nylon filaments are grouped into bundles according to the target strand count (3, 4, or 8 strands). Each bundle is twisted using specialized twisting machines— the direction and tightness of the twist are calibrated to ensure strand uniformity and stability. This twisting step binds the filaments together, forming individual, strong strands.
4. Rope Construction (Final Twisting/Braiding): For twisted rope types, the pre-formed 3, 4, or 8 strands are fed into a stranding machine, where they are twisted together in the opposite direction of their individual twist (counter-twist) to create the final rope. This counter-twist balances the rope’s tension, preventing it from unraveling and ensuring structural integrity. For cord or twine variants, the process may involve lighter twisting of fewer filaments to achieve the desired thickness.
5. Post-Processing & Quality Inspection: The finished rope undergoes post-processing steps such as trimming (to remove loose filaments), surface smoothing (if needed), and optional treatments (e.g., UV inhibitors for outdoor use, anti-abrasion coatings). Finally, quality inspection is conducted— checking parameters like tensile strength, strand uniformity, twist consistency, and dimensional accuracy (thickness, length) to ensure compliance with standards. Defective products are discarded or reprocessed.

Key Features

• High Tensile Strength & Load-Bearing Capacity: The twisted structure of 3/4/8 strands optimizes the inherent strength of polyamide (nylon), allowing the rope to withstand heavy static and dynamic loads without breaking or stretching excessively. More strands (e.g., 8 strands vs. 3 strands) further enhance load distribution, making it suitable for applications requiring reliable weight support.
• Good Elasticity & Shock Absorption: Nylon’s natural elasticity is preserved in the twisted design, enabling the rope to stretch (typically 15–30% of its length) and recoil when subjected to sudden impacts or tension spikes. This property cushions shocks— such as those from dropped loads or sudden pulls— protecting both the rope and connected equipment from damage.
• Resistance to Moisture, Chemicals & Mildew: Polyamide (nylon) is inherently water-resistant; it does not absorb moisture easily, preventing weight gain, rot, or mildew growth even when exposed to damp environments (e.g., rain, humidity). It also resists degradation from most common chemicals (e.g., mild detergents, oils), maintaining performance in harsh or contaminated settings.
• Abrasion Resistance for Longevity: The twisted strand construction creates a dense, rugged outer surface that withstands friction against rough surfaces (e.g., concrete, metal, plastic). Unlike thin, single-strand cords, the multi-strand design distributes wear evenly across strands, reducing fraying and extending the rope’s service life in high-wear applications.
• Flexibility & Ease of Handling: Despite its strength, the twisted nylon rope remains flexible, allowing for easy tying, knotting, and coiling. It does not become stiff or brittle in normal temperature ranges (from -20°C to 60°C), making it convenient to use in both indoor and outdoor settings— even for tasks requiring frequent manipulation (e.g., packing, bundling).

Application Scope

• Packaging & Shipping Industry: Used as packing thread or cord for securing packages, cartons, or pallets. Its strength ensures packages stay tightly sealed during transit, while flexibility allows for easy knotting around irregularly shaped items. It is also used to bundle lightweight goods (e.g., paper rolls, small boxes) to prevent shifting.
• Agriculture & Horticulture: Suitable for tying and supporting plants (e.g., tomatoes, vines, shrubs) to stakes or trellises. Its elasticity accommodates plant growth without cutting into stems, and moisture resistance prevents rot when exposed to irrigation or rain. It can also be used to bundle harvested crops (e.g., vegetables, fruits) for transport.
• Household & DIY Projects: Ideal for everyday household tasks such as organizing garage items (tying tools, hoses), hanging lightweight decorations (e.g., party banners, indoor plants), or repairing small items (e.g., broken backpack straps, loose furniture parts). Its flexibility and ease of handling make it a versatile tool for DIY enthusiasts.
• Light Industrial & Warehouse Use: Used in warehouses for bundling pipes, cables, or small parts to keep workspaces organized. It also serves as a temporary tie-down for lightweight equipment or inventory during storage or movement. Its chemical resistance makes it safe for use around mild industrial solvents or oils.
• Recreational & Outdoor Activities: Suitable for lightweight outdoor uses such as camping (tying tent guy lines, bundling sleeping bags or gear), hiking (securing items to backpacks), or crafting (making outdoor decorations, pet toys). The UV resistance (in treated variants) ensures it remains durable under sunlight, while its flexibility makes it easy to carry and store.

Since its establishment in 2005, Qingdao Jincheng Maritime Technology Co., Ltd. has been steadily advancing in the maritime technology field for nearly two decades. The company focuses on the core business of manufacturing marine supplies, always adhering to the concepts of innovation and excellence, and is committed to providing comprehensive and high-quality products and services to the global maritime industry.

In terms of product manufacturing, the company has a rich and diverse product line, covering marine navigation equipment, marine safety protection supplies, marine interior decorations, and various functional accessories for ships. From precise navigation instruments to sturdy and durable life-saving equipment, from comfortable and beautiful cabin interiors to efficient and practical marine tools, every product undergoes strict quality control to ensure compliance with international standards and industry specifications.

The company attaches great importance to technological research and development and innovation. It has formed a research and development team composed of senior maritime engineers, professional technicians, and innovative talents. The team continuously explores cutting-edge technologies, actively introduces new materials and processes, and continuously optimizes product performance to meet the growing intelligent and green demands of the maritime industry. At the same time, the company has established long-term and stable cooperative relationships with many well-known domestic and foreign universities and scientific research institutions. Through the collaborative innovation of industry, university, and research, it accelerates the transformation of scientific research achievements and injects a continuous stream of impetus into the company's development.

With reliable product quality, advanced technological level, and a complete after-sales service system, Qingdao Jincheng Maritime Technology Co., Ltd. has won a good reputation and wide recognition in the industry. Its products not only sell well in major domestic ports and shipbuilding enterprises but also are exported to many countries and regions overseas. The company has established long-term cooperative relationships with many internationally renowned shipping companies. Looking to the future, the company will continue to forge ahead, continuously enhance its core competitiveness, and contribute to the advancement of maritime technology and the development of the global shipping industry.