News center
12

2026-11

CW-1 Thickness Guide for Non Woven Binding Tape

Two CW-1 grades overlap in thickness. Which one fits? If both CW-1-30 and CW-1-40 fit the binding head, which non woven binding tape should purchasing sample? Start with the limit that could rule a grade out: the tape thickness your drawing allows or the minimum tensile strength it specifies. The published tolerances for the two grades overlap. A measurement taken from one unmarked roll can therefore point to either grade.

Stack of white CW-1 nonwoven binding tape rolls in different widths

How the two non woven binding tape grades compare

Jiangsu Chaowang New Material lists the following values in its CW-1 grade specifications for cable-core binding. The figures are useful when preparing a sample request because they show which differences a production trial needs to resolve.

  • CW-1-30 has a mass per unit area of 30 ± 4 g/m², a thickness of 0.20 ± 0.03 mm and a minimum tensile strength of 28 N/cm.
  • CW-1-40 has a mass per unit area of 40 ± 4 g/m², a thickness of 0.25 ± 0.03 mm and a minimum tensile strength of 34 N/cm.

Applying the stated tolerances gives thickness ranges of 0.17–0.23 mm and 0.22–0.28 mm. A result of 0.225 mm falls inside both ranges. If your receiving team gets that reading on a sample with a missing label, check the grade code, lot record and certificate before releasing it. The thickness measurement is consistent with either identity.

CW-1-30 spans 0.17 to 0.23 mm and CW-1-40 spans 0.22 to 0.28 mm, overlapping from 0.22 to 0.23 mm

The mass figures can also answer a purchasing question. At the nominal values, 1,000 m² of CW-1-30 contains about 30 kg of tape material and the same area of CW-1-40 about 40 kg. That is a comparison at equal area. To estimate consumption per kilometer of finished cable, use the width, wrap pitch and scrap from the approved construction. Keep the mass of the packaging and roll core out of the calculation.

Which requirement would exclude a grade?

Consider two illustrative RFQs. The first specifies a maximum incoming tape thickness of 0.23 mm, measured by the agreed method. The upper end of the published CW-1-30 range meets that limit. CW-1-40 allows material up to 0.28 mm. Even if its trial roll measures 0.225 mm, that one result does not qualify the whole published range for this order.

The second RFQ requires at least 32 N/cm in the specified tensile test. CW-1-40 lists a minimum of 34 N/cm. CW-1-30 lists 28 N/cm, so its published minimum leaves a gap against that requirement. If the same drawing requires both a 0.23 mm maximum and 32 N/cm minimum, neither catalog row covers both limits as written. Ask engineering and the supplier to resolve the mismatch before ordering a production quantity.

Agree on the measurement conditions as well as the numbers. The public scope of ISO 9073-2, determination of nonwoven thickness describes thickness measured under a specified pressure. For tensile results, ISO 9073-3:2023, the strip tensile method covers different specimen widths and conditioning options. The CW-1 product table names the ISO method families. Ask for the edition, direction and conditions actually used for the offered grade when comparing a certificate with a customer's specification.

What to measure on the binding line

Once both candidates meet the purchase requirements, give the operator a trial that can distinguish them. Use the same core design, tape width, target coverage and downstream operation. Take one labeled sample from each roll before wrapping. Record the line settings for each run and note any adjustment needed to obtain an acceptable wrap. A tension change made midway through the trial matters when the two specimens are reviewed later.

Close view of the white fibrous surface and edge of CW-1 binding tape

Inspect the bound core just after the head and again after the next covering is applied. Measure the diameter at equivalent locations, and mark where the measurement crosses an overlap. Check whether the core stays together through the transfer to the next operation. A diameter increase at a folded edge calls for a different correction from a consistent increase throughout the wrapped length. Retaining a short, labeled cutback makes that difference easier to show the buyer.

Agree beforehand what would justify changing grades. If both meet the dimensional limit, hold the core and run at the required speed, compare material consumed and scrap per accepted length. If only one stays within the diameter limit, record the actual measurements and roll identity alongside the decision. The next buyer can then see why the approved purchase line identifies a specific CW-1 grade.

Questions buyers ask about a CW-1 trial

Can the tensile minimum be used as a line tension setting? The catalog figure is a strip-test property reported per unit width. Establish working tension on the binding head with the specified core, coverage and payoff conditions.

Which grade has the higher published elongation minimum? The CW-1 table lists at least 12% for both. Use the project’s own requirement and ask for comparable lot data if elongation is a selection factor.

Can a width change be included in the trial? Record it as a separate run. Changing width and grade together makes it difficult to tell which change affected coverage or core diameter.

Does this comparison cover a water-blocking layer? The two grades discussed here are core binders. If the drawing also calls for a swellable layer, look up CW-5 water-blocking tape separately in the nonwoven cable tape range and give that layer its own purchase line.

What should the approval record identify? Include the grade, roll lot, tested width, accepted cable drawing revision and the line conditions used to make the retained sample.

To request a non woven binding tape sample from Chaowang, send the maximum tape thickness, tensile minimum and slit width on your drawing. Identify CW-1-30, CW-1-40 or both, and request the current grade sheet and a labeled sample roll for each material you intend to trial.

Technical References

Other news