High-quality marine-grade nylon filaments are selected as the base material, ensuring they meet standards for tensile strength, saltwater resistance, and UV stability—critical for marine environments. The nylon filaments are first unwound from spools and passed through a cleaning system to remove dust, oil, or other contaminants that could affect the rope’s durability. They are then aligned uniformly to ensure consistent fiber distribution in subsequent steps.
The cleaned nylon filaments undergo a drawing process, where they are stretched under controlled tension to align the molecular structure of the fibers. This step enhances the filaments’ tensile strength and reduces elongation, making them suitable for load-bearing marine applications. After drawing, some filaments may be textured (via a heat-setting process) to improve flexibility and reduce brittleness, ensuring the final rope can bend and twist without cracking.
The processed nylon filaments are spun into individual strands using a stranding machine. For a 3-strand rope, three separate strands are created, each with a consistent thickness and twist rate. During spinning, the filaments are twisted tightly to form cohesive strands—this twist locks the fibers together, boosting the strand’s resistance to fraying. The strands are then wound onto temporary bobbins, ready for the twisting phase.
The three prepared strands are fed into a twisting machine (often a double-twist or planetary twister) at a synchronized speed. The machine twists the three strands together in a uniform, helical pattern—this “twisted” construction is key to the rope’s stability and load-bearing capacity, as it distributes tension evenly across all three strands. The twist rate is carefully controlled: too loose, and the rope may unravel; too tight, and it may become stiff and prone to kinking.
After twisting, the rope undergoes a coloring process to achieve the white color. This typically involves a dyeing or coating method using marine-grade, fade-resistant white pigments that adhere to the nylon fibers. The coloring process is followed by a UV stabilization treatment—where a protective coating (containing UV inhibitors) is applied to the rope’s surface. This coating prevents the white color from fading and shields the nylon fibers from degradation caused by prolonged sun exposure, a common issue in marine settings.
The colored and treated rope is passed through a sizing machine to ensure a consistent diameter (matching the required specifications for marine packing use). It is then cut into standard lengths (e.g., 50m, 100m rolls) or custom lengths based on application needs. Finally, each roll undergoes quality inspection: technicians test tensile strength (using a load-testing machine), check for uniform twist and color, and verify resistance to water absorption. Only ropes that meet all marine-grade standards proceed to packaging.
The inspected ropes are wound onto durable, water-resistant spools or wrapped in moisture-proof plastic film to protect them from dust and moisture during storage and transportation. Labels indicating key specifications (e.g., material: 3-strand twisted nylon, color: white, length, tensile strength) are attached to the packaging, ensuring clarity for end-users in marine settings.
This rope is widely used to secure cargo, supplies, or equipment on the decks of small to medium-sized marine vessels (e.g., fishing boats, recreational yachts, coastal transport ships). Its white color enhances visibility (helping crew avoid tripping or tangling), while the 3-strand twisted nylon construction provides enough strength to hold cargo in place during rough seas. It resists saltwater damage, so it remains reliable even when exposed to spray or splashes.
For marine shipping, it is used to bundle or seal lightweight containers (e.g., plastic crates of tools, canvas bags of supplies) that need to be transported on boats or between shore and vessels. The rope’s flexibility allows it to be tied into secure knots (e.g., square knots) around irregularly shaped packages, and its white color makes it easy to identify sealed containers. Unlike non-marine ropes, it does not absorb water, so packaged items stay dry.
While not designed for heavy-duty permanent mooring, it serves as a temporary mooring rope for small watercraft (e.g., dinghies, kayaks, paddleboards) when docking at marinas or shorelines for short periods. Its white color is visible in low light (reducing the risk of other boats hitting it), and the 3-strand design ensures it can be quickly tied to cleats or dock posts. It is lightweight and easy to coil, making it convenient for storage on small boats.
During marine maintenance (e.g., cleaning boat hulls, repairing small parts), this rope is used to secure tools, brushes, or replacement parts to the boat’s deck or railings—preventing them from falling overboard. Its white color makes lost tools easier to spot in shallow water, and its nylon material resists damage from cleaning chemicals or saltwater. It is also used to hang wet maintenance gear (e.g., towels, gloves) to dry, as it dries quickly itself.
For recreational marine activities (e.g., camping on boat decks, setting up temporary swimming areas), it is used for light tasks like hanging lanterns, securing inflatable toys (e.g., pool noodles, small rafts), or creating boundary lines for safe swimming zones. Its white color is bright and non-intrusive in natural settings, and its soft twisted texture avoids damaging inflatables or camping gear. It is easy to handle, making it suitable for casual users.
2. Main performance
| Material | Polyamide
Multifilament | Polyamide
Yarn | Polypropylene
Multifilament | Polypropylene | Polyester | Polypropylene and
Polyester Mixed |
| Spec.Density | 1.14
no floating | 1.14
not floating | 0.91
no floating | 0.91
Floating | 1.27
no floating | 0.95
Floating |
| Melting Point | 215℃ | 215℃ | 165℃ | 165℃ | 260℃ | 165℃/260℃ |
| Abrasion Resistance | Very Good | Very Good | Medium | Medium | Good | Good |
| U.V.Resistance | Very Good | Very Good | Medium | Medium | Good | Good |
| Temperature resistance | 120℃max | 120℃max | 70℃max | 70℃max | 120℃max | 80℃max |
| Chemical resistance | Very Good | Very Good | Good | Good | Good | Good |
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
Specification
规格 | PA Multifilament
锦纶复丝 | PAYarn
锦纶 | PP Multifilament
丙纶长丝 | Polypropylene
丙纶 | Polyester
涤纶 | PET/PP Mixed
丙纶/涤纶混合绳 |
| Dia. | Cir | Ktex | KN | Ktex | KN | Ktex | KN | Ktex | KN | Ktex | KN | Ktex | KN |
| 直径 | 圆 周 | 线密度 | 破断强力 | 线密度 | 破断强力 | 线密度 | 破断强力 | 线密度 | 破断强力 | 线密度 | 破断强力 | 线密度 | 破断强力 |
| 4 | 1/2 | 10 | 3.7 | 10 | 2.6 | 6.3 | 2.3 | 6 | 2.1 | 12 | 2.9 | 7.0 | 2.8 |
| 6 | 3/4 | 22 | 7.9 | 22 | 6 | 18 | 6.5 | 17 | 5.9 | 27 | 5.6 | 17.5 | 6.8 |
| 8 | 1 | 40 | 13.8 | 40 | 10.9 | 32 | 11.4 | 30 | 10.4 | 48 | 10.0 | 31 | 11.9 |
| 10 | 1-1/4 | 62 | 21.2 | 62 | 15.7 | 47 | 16.8 | 45 | 15.3 | 76 | 15.6 | 48.5 | 18.2 |
| 12 | 1-1/2 | 89 | 30.1 | 89 | 24.1 | 68 | 23.9 | 65 | 21.7 | 110 | 22.3 | 69.9 | 25.7 |
| 14 | 1-3/4 | 121 | 40.0 | 121 | 33.0 | 95 | 32.9 | 90 | 29.9 | 148 | 31.2 | 95.1 | 34.7 |
| 16 | 2 | 158 | 51.9 | 158 | 42.5 | 121 | 40.7 | 115 | 37.0 | 195 | 39.8 | 124 | 44.8 |
| 18 | 2-1/4 | 200 | 64.3 | 200 | 53.9 | 155 | 51.9 | 148 | 47.2 | 245 | 49.8 | 157 | 56.1 |
| 20 | 2-1/2 | 247 | 79.2 | 247 | 66.7 | 189 | 62.6 | 180 | 56.9 | 303 | 62.3 | 194 | 68.7 |
| 22 | 2-3/4 | 299 | 94.0 | 299 | 80.4 | 231 | 75.0 | 220 | 68.2 | 367 | 74.7 | 235 | 82.1 |
| 24 | 3 | 355 | 112 | 355 | 93.6 | 273 | 87.7 | 260 | 79.7 | 437 | 89.6 | 279 | 96.3 |
| 26 | 3-1/4 | 417 | 129 | 417 | 111.5 | 320 | 101 | 305 | 92.2 | 512 | 105 | 328 | 113 |
| 28 | 3-1/2 | 484 | 149 | 484 | 127 | 373 | 115 | 355 | 105 | 594 | 120 | 380 | 130 |
| 30 | 3-3/4 | 555 | 169 | 555 | 143 | 425 | 132 | 405 | 120 | 682 | 134 | 437 | 148 |
| 32 | 4 | 632 | 192 | 632 | 161 | 483 | 146 | 460 | 132 | 778 | 154 | 497 | 167 |
| 36 | 4 - 1/ 2 | 800 | 240 | 800 | 200 | 614 | 182 | 585 | 166 | 982 | 190 | 629 | 210 |
| 40 | 5 | 987 | 294 | 987 | 241 | 756 | 221 | 720 | 201 | 1215 | 235 | 776 | 257 |
| 44 | 5-1/2 | 1190 | 351 | 1190 | 289 | 924 | 266 | 880 | 242 | 1468 | 275 | 939 | 308 |
| 48 | 6 | 1420 | 412 | 1420 | 338 | 1092 | 308 | 1040 | 280 | 1750 | 329 | 1110 | 364 |
| 52 | 6-1/2 | 1670 | 479 | 1670 | 393 | 1281 | 357 | 1220 | 325 | 2050 | 384 | 1320 | 424 |
| 56 | 7 | 1930 | 550 | 1930 | 450 | 1491 | 408 | 1420 | 371 | 2380 | 439 | 1520 | 489 |
