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 |
