DuPont Nylon Paper Guiding Carrier Rope for Dryer Cylinder

Lift Sling Rigging Co., Ltd. manufactures the DuPont Nylon Paper Guiding Carrier Rope for Dryer Cylinder - an 8-strand braided carrier rope in high-tenacity polyamide (nylon) filament, hollow coreless or with an inner core, Ø8-20 mm, minimum breaking strength 10,800 N to 22,000 N, working elongation 3%-5%, recommended operating temperature 90-100 C with a 180 C peak. Supplied in red, blue and yellow, waxed or unwaxed, with splicing guidance. Phone 18066002268.

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Release time：2026-09-15 11:29

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Lift Sling Rigging Co., Ltd manufacture DuPont Nylon Paper Guiding Carrier Rope for Dryer Cylinder

DuPont Nylon Paper Guiding Carrier Rope for Dryer Cylinder is an 8-strand braided paper machine carrier rope (also called a paper guiding rope, paper transfer rope or threading rope) woven from high-tenacity polyamide (nylon) filament, produced by Lift Sling Rigging Co., Ltd. It is the connecting link between the rollers of different diameters across the dryer sections of a paper machine: a narrow leader strip — the tail — is clamped in the rope nip formed where two or three of these ropes run side by side, and is carried from one roller to the next through the pre-dryer, dryer, post-dryer and reel sections. Supplied in Ø8 mm to Ø20 mm with a minimum breaking strength of 10,800 N to 22,000 N, a working elongation of 3%-5%, a recommended continuous operating temperature of 90-100 °C and a 180 °C peak, in hollow (coreless) or with-inner-core construction, waxed or unwaxed, in red, blue and yellow.

DuPont Nylon Paper Guiding Carrier Rope for Dryer Cylinder 8 strand braided paper machine carrier rope

DuPont nylon paper guiding carrier rope - 8-strand braided for the dryer sections of a paper machine

1. What Is a DuPont Nylon Paper Guiding Carrier Rope?

A carrier rope is not a load-bearing sling and it is not an ordinary nylon rope. It is a process rope whose job is to keep production running: when the web breaks, or on every start-up, a narrow tail is separated from the sheet and has to be threaded through the machine to the reel. Without a rope ring in place, that threading has to be done by hand, at machine speed, over tens of metres of hot cylinders.

The rope does this by forming a rope nip. Two or three ropes run closely together in a loop around the section, and the tail is fed into the convergent point between them and clamped by the friction of the pair. The ropes then carry the tail around the cylinders and through the finishing equipment until it reaches the reel.

A rope threading system consists of:

Rope pulleys — the dimensions (diameter, width and groove depth) follow the machine speed and the paper basis weight.
Leading pulleys — shallower grooves, used to form the rope threading wedges at the transfer points.
Guiding pulleys — deeper grooves, used to route the ropes through the machine.
A rope stretcher — pneumatic (adjustable, with a quadruple cylinder stroke) or mechanical (weights, doubled stroke), used to keep each rope individually tensioned.
A rope drive — only needed where the ropes do not pass over the drying cylinders, or where web contact alone cannot prevent slippage.

Why not just use any nylon rope? Two reasons, and both are measurable. First, the elongation behaviour has to sit in a narrow band — this is covered in section 3 and it is the single most important selection figure for a carrier rope. Second, the fibre has to be impregnated, because the rope's other job is grip: the impregnation protects the filaments and leaves a surface that positively holds the paper tail rather than polishing it.

About the fibre. The rope is braided from high-tenacity polyamide filament, the grade known in the trade as DuPont nylon. Nylon 66 was first synthesised from adipic acid and hexamethylenediamine on 28 February 1935 by Wallace Carothers' team at DuPont — the dense hydrogen bonding in the polyamide chain is what gives the fibre its combination of high tenacity, abrasion resistance and useful heat resistance, which is why it became the reference fibre for this application. The rope is braided in-house; the fibre is bought in. DuPont™ is a trademark of DuPont de Nemours, Inc., and is used here only to describe the fibre.

2. Two Ropes or Three? Sizing the System to the Paper Grade

The number of ropes in the ring is set by the basis weight of the paper, because a heavier sheet needs more grip to be held in the nip.

Rope system selection by paper basis weight
Basis weight of the paper	Rope system	Why
40-120 g/m²	Two-rope (dual rope) system	For lighter grades, the nip formed by a pair of ropes holds the tail reliably
Above 120 g/m²	Three-rope (triple rope) system	A heavier tail needs the extra contact of a third rope to stay in the nip

The ropes always run in the same loop and are tensioned individually. Get this decision wrong in either direction and the machine will tell you: too few ropes and the tail drops out; more ropes than the grade needs adds drag and wear for nothing.

3. Diameter and Machine Speed

Machine speed sets the diameter, because diameter sets strength and the rope has to survive the tension differences it meets along the section.

Diameter selection by machine speed
Machine speed	Nominal rope diameter	Working elongation
Up to 300 m/min	Ø8-12 mm	3%-5%
300-800 m/min	Ø12-15 mm	3%-5%
Above 800 m/min	Ø15-20 mm, or a rope with an inner core	3%-5%

The elongation figure deserves its own paragraph, because it is the one most often ignored and the one that stops the machine. A carrier rope must have a working elongation of 3%-5%, and both ends of that band fail:

Too little elongation and the speed differences between the dryer groups load the rope instead of the paper — the rope is pulled apart.
Too much elongation and the rope goes slack in some interval, the nip opens and the tail is no longer clamped.

Working elongation 3%-5%  &ne;  elongation at break ≤30%

Note that this is the working elongation under operating tension. It is not the same quantity as the elongation at break of ≤30% quoted in the specification table in section 5, which is a material test result measured when the rope is taken to destruction. Confusing the two is the most common specification error in this product category — a 30% figure says nothing at all about whether the rope will hold the tail.

4. Hollow (Coreless) or With Inner Core?

Both constructions are 8-strand braided and both are made from the same fibre. They differ in what happens to the rope's length under sustained tension, and that difference decides whether the nip keeps its grip.

Hollow (coreless) compared with with-inner-core construction
Point of comparison	Hollow (coreless)	With inner core
Construction	8-strand hollow braid with no core	8-strand braid over a high-tenacity polyamide filament core
Splicing	The hollow centre takes the splice — the quickest and easiest of the two to splice	Needs a longer, more careful splice; a poor splice shows up as reduced service life
Elongation under tension	Higher	Lower: the core resists elongation and absorbs shock loads
Behaviour in the rope nip	At high elongation the pair goes slack and can stop clamping the tail	Holds tension in the pair, so the nip keeps its grip
Recommended for	Lower machine speeds and lighter paper grades, and where splicing is frequent	Higher machine speeds and heavier paper grades

There is a specific failure that decides this question in practice. A mill running a coreless rope found the two ropes had gone slack between the pulleys and would no longer carry the sheet; the diagnosis was that the coreless rope's elongation was too large, and when the ring was changed to a rope with an inner core the threading returned to normal. If your machine runs fast or the grade is heavy, specify the inner core from the start.

The full range of constructions — hollow, cored, waxed, dyed and high-temperature variants — is listed on the carrier rope for paper machine and the hollow braided coreless paper carrier rope pages; the with core / without core nylon paper carrier rope page covers the core types in more detail, and the dyeing paper carrier rope page covers the surface-finish options.

5. Technical Specifications

DuPont nylon paper guiding carrier rope — breaking strength and elongation by diameter
Nominal diameter	Linear density (ktex = g/m)	Minimum breaking strength	Elongation at break
8 mm	52	10,800 N	≤30%
10 mm	72	14,700 N	≤30%
12 mm	78	16,700 N	≤30%
14 mm	84	18,080 N	≤30%
16 mm	110	22,000 N	≤30%

Notes on the table:

The full nominal diameter range is 8 mm to 20 mm; the five sizes above are the standard stock sizes and the ones most paper machines are built around. Other diameters, lengths and colours are made to order.
Linear density tolerance is ±5%, so a 12 mm rope is quoted as 78 ktex and delivered within 74.1-81.9 ktex.
Elongation at break is a destruction test value, not a working figure. The figure that governs selection is the working elongation of 3%-5% in section 3.
Strength and linear density are quoted by nominal diameter; final values are stated on the order confirmation and on the test certificate for the batch.
The rope is braided with matched tension across the S-twist and Z-twist strands, so the load is shared evenly between strands rather than concentrating in the tightest one.

Material and construction summary: high-tenacity polyamide (nylon 66) filament; 8-strand braided, anti-twist; hollow braid (coreless) or braided over a polyamide filament core; special impregnation applied to each thread, which protects the fibre and provides the high-friction surface that grips the tail; standard colours red, blue and yellow; surface supplied waxed or unwaxed to order.

6. Temperature Limits: What DuPont Nylon Can and Cannot Take

Nylon is chosen for the dryer sections because it tolerates more heat than polyester, but “more” is a number, and the number has two parts.

Temperature limits of a DuPont nylon paper guiding carrier rope
Limit	Value	What it means in service
Recommended continuous operating temperature	90-100 °C	The rope body temperature in normal running through the dryer sections
Peak (short-term) temperature	180 °C	Transient exposure only — this is not a continuous rating
Melting point of the polyamide (PA66) fibre	255-265 °C	The physical ceiling of the material itself
Sustained operation above 180 °C	Not recommended for a nylon rope	Above this the rope grade has to change, not the temperature claim

Why the melting point is in this table. Nylon 66 melts at 255-265 °C, so no nylon carrier rope can survive at 280 °C — the fibre would be liquid. When you see a high figure such as 180-280 °C quoted for a carrier rope, read it carefully: it is either describing the temperature of the machine environment the rope has to work inside, or it belongs to a different fibre entirely (aramid ropes are used where the running temperature genuinely goes higher). For a nylon rope, treat 90-100 °C as the continuous figure and 180 °C as the peak, and choose a different fibre if your machine needs more.

Why heat matters even below the melting point. Long before the fibre melts, sustained heat ages it: the filament loses tenacity, the impregnation migrates and the surface that grips the tail stops gripping. That is why the recommended continuous temperature is far below the melting point — it is a service-life limit, not a survival limit.

7. Where the Rope Runs: Pre-Dryer, Dryer, Post-Dryer and Reel

The same rope is used through the whole run, but the duty changes from section to section, and so does what you should worry about.

Duty of the carrier rope through the machine sections
Machine section	What the rope does there	Selection note
Pre-dryer section	Takes the tail from the press into the first heated groups	The rope's temperature climbs steeply here — this is where heat resistance starts to matter
Dryer section	Carries the tail across the drying cylinders	The section the rope is named for, and the highest sustained rope temperature
Post-dryer section	Carries the tail through the finishing groups after the last dryer	Temperature has dropped; grip and abrasion resistance now dominate
Reel section	Delivers the tail to the reel	Lowest temperature of the run; steady tension matters most

Section temperatures vary from machine to machine with steam pressure and cylinder loading, so confirm the figures for your machine rather than assuming the run is uniform. Where a single rope ring passes through all four sections, size it for the hottest point in the run, not the average.

8. Rope Rings, Splicing and Fitting

A carrier rope is not used as a straight length. The two ends are spliced into each other to form a continuous ring, and that ring then runs around the section's pulleys as a closed loop.

Ring length: typically 50 m to 100 m, depending on the section and the machine layout.
Splice: the connection is made with an overlap of at least 500 mm, with the rope ends cut on a bevel (tapered) before splicing so the joint tapers back to the full diameter instead of leaving a step.
Why the splice matters so much: the connection method directly determines the service life of the rope. A short, square-ended splice concentrates stress at the joint, creeps under load and eventually either pulls out or wears through — and it will fail long before the rope body does.
Fitting a new rope: observe the rope wheel direction and the inner/outer rope arrangement. Ropes that are crossed or swapped between the inner and outer positions wear on one side only and tangle at the transfer points.
Tension: the ring must be properly tensioned under operating conditions, with each rope adjusted individually on the stretcher. An under-tensioned ring will sag and lose the nip; an over-tensioned one wears the pulleys and the rope.

Splice details, and the pulley guidance needed to set the ring up, are on the paper machine rope threading system page.

9. Troubleshooting

Carrier rope troubleshooting guide
Symptom	Most likely cause	What to do
The tail is not picked up out of the nip	The rope pair has elongated past the working range and gone slack	Measure the working elongation against the 3%-5% band; change to a rope with an inner core
The rope flattens and loses its round section	Wrong construction for the pulley groove, or over-tension	Check the pulley groove; specify a hollow braid, which resists flattening under normal tension
The rope breaks between dryer groups	Working elongation too low, so the speed difference between dryer groups loads the rope	Move to a rope grade whose working elongation sits inside 3%-5%
Wear appears on one side of the rope only	The ring was fitted with the ropes crossed, or the inner and outer ropes swapped	Refit following the rope wheel direction and the inner/outer arrangement
The splice creeps or pulls out	Splice too short, or the ends were not bevel-cut	Re-splice with an overlap of at least 500 mm and bevel-cut ends
The ring runs slack, then tight	Tension or stretcher stroke, or debris packed in the groove	Check the rope stretcher stroke and clean the pulley grooves

Most carrier rope problems are elongation problems, and most elongation problems are either the wrong construction for the speed or a splice that has started to creep. Both are visible on inspection before they stop the machine.

10. Inspection, Care and Retirement

Inspection points and action for a paper machine carrier rope
What to check	Look for	Action
Rope body	Flattening, glazing, pick-up of fibre and dust, abrasion at the pulley contact	Replace if the section has flattened or the braid has opened
Working elongation	The ring is longer than it was when fitted	Compare against the 3%-5% band; re-splice or replace
Splice	Creep, opened braid, a step in diameter	Re-splice with at least a 500 mm overlap
Rope pulleys	Groove wear, scale, debris, wrong groove depth	Replace worn pulleys and clean the grooves
Rope wheel direction and inner/outer arrangement	Crossed or tangled ropes	Refit correctly at every rope change
Surface treatment	The wax film worn away or contaminated	Re-wax or replace
Storage	Sunlight, oil, chemicals, sharp edges	Store dry, dark and off the floor

Care rules: keep the ring properly tensioned; check the pulleys for wear and replace worn parts rather than compensating with tension; keep grooves clear of dust and debris, which cause jams; clean with mild soap and water and dry naturally, away from heat; never repair or splice a rope in an unapproved way, and never re-use a rope whose splice has failed. A rope that has been taken out of service should be cut through before disposal so it cannot be put back on a machine.

11. Frequently Asked Questions (FAQ)

Q1: What is the difference between a carrier rope and an ordinary nylon rope?

Three things. A carrier rope is braided as an 8-strand anti-twist rope so it keeps a round section and does not flatten under tension; the fibre is impregnated, which protects it and gives the high-friction surface that actually grips the paper tail; and it is selected on a narrow working-elongation band of 3%-5%, which ordinary rope is not. An ordinary nylon rope will run, but it will not reliably carry a tail.

Q2: Which paper grades need a three-rope system?

Basis weight decides it. A two-rope (dual) system covers 40-120 g/m². Above 120 g/m² the tail is heavy enough that a third rope is needed to hold it in the nip.

Q3: What diameter do I need for my machine speed?

At 300-800 m/min, Ø12-15 mm is normally sufficient. Below that, Ø8-12 mm; above 800 m/min go to Ø15-20 mm or specify a rope with an inner core, which resists elongation better. Confirm against your own section geometry before ordering.

Q4: Hollow or with inner core — which should I order?

Hollow (coreless) for lower speeds, lighter grades and where splicing is frequent. With inner core for higher speeds and heavier grades. The inner core lowers elongation, which is what keeps the nip from going slack.

Q5: What does the rope weigh and how strong is it?

Linear density runs from 52 ktex (8 mm, 52 g/m) to 110 ktex (16 mm, 110 g/m), with a ±5% tolerance. Minimum breaking strength runs from 10,800 N at 8 mm to 22,000 N at 16 mm. Both figures are quoted by nominal diameter and are confirmed on the order.

Q6: What is the real temperature limit of a nylon carrier rope?

90-100 °C continuous, with a 180 °C peak for short-term exposure. Nylon 66 itself melts at 255-265 °C, so any figure of 280 °C cannot describe the nylon rope — it either refers to the machine environment or to a different fibre such as aramid.

Q7: How long is a rope ring, and how is it spliced?

Typically 50-100 m depending on the section. The ends are spliced into each other with an overlap of at least 500 mm, bevel-cut first so the joint tapers back to full diameter. The splice is the weakest part of the ring and is usually what determines its service life.

Q8: Why has the paper tail stopped being picked up?

Almost always elongation. If the working elongation has gone beyond the 3%-5% band the rope pair sags between the pulleys, the nip opens and the tail is no longer clamped. A rope with an inner core, or a fresh splice, normally fixes it.

Q9: How often should a carrier rope be inspected?

Check the rope body, the splice and the pulley grooves at every rope change and on a regular schedule in between. The two things to watch are the working elongation and the condition of the splice; both deteriorate slowly and both are visible before they cause a break.

Q10: How do I get a quotation?

Send us: the machine section and the machine speed; the paper basis weight and whether the system is two-rope or three-rope; the nominal diameter you need, or the roller and pulley geometry so we can advise; hollow or with inner core; the ring length (or the section layout); the colour and whether you want it waxed; the operating temperature; and the quantity. We will come back with a specification and price.

Contact us - DuPont Nylon Paper Guiding Carrier Rope direct from the manufacturer

Tell us the machine section, the speed and the paper grade, and we will come back with the specification and price for your DuPont Nylon Paper Guiding Carrier Rope, including the diameter, the construction, the ring length and the splice guidance for your rope threading system. Volume discounts apply, and we build to order in any diameter from 8 mm to 20 mm, in red, blue and yellow, waxed or unwaxed.

Contact: Wang Lili
Phone: 18066002268
E-mail: 702461526@qq.com
Address: Lifute Industrial Park, Taizhou City, Jiangsu Province, China
Send an enquiry >>

DuPont™ is a trademark of DuPont de Nemours, Inc., and is used on this page only to identify the fibre used in the rope.

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Nylon Paper Guiding Carrier Rope