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Industry: textile and fibres · TD-NMR

Proof of finish removal after washing

Check that a finish has been washed off before a further treatment, such as a water-repellent or protective coating, so that the next step adheres and performs.

Contact us← Industry: textile and fibres
What it tells you

Whether the fibre is really clean

A spin finish helps a yarn to run through machines. Once the yarn has become a fabric, the finish is often in the way: it can stop a dye, a coating or a water-repellent or protective treatment from adhering and performing as intended. The yarn or fabric is therefore washed first, and the question is whether the wash has removed enough.

Bars of finish remaining on a yarn before washing, after a good wash and after an incomplete wash, with an acceptable level marked
Finish before and after washing. Schematic illustration, not measured data.
Typical samples

Where it is used

  • Yarns and woven or knitted fabrics for technical use
  • Protective and ballistic textiles
  • Fabrics that receive a water-repellent, windproof or other functional treatment
  • Fabrics that are dyed, printed, bonded or coated after washing

Typical tasks are checking a wash against a limit, comparing washing recipes, time, temperature and chemicals, and checking the incoming fabric from a supplier.

How it works

The same measurement as for finish, at a low level

A piece of the washed yarn or fabric is placed in a tube and the signal of the remaining finish is read, exactly as on the finish page. The result is compared with the limit that your next treatment needs. A washed reference sample without finish serves as a blank.

Four steps: wash the yarn or fabric, measure the finish left, compare with a limit, and continue with the next treatment or wash again
Checking a wash before the next treatment. Schematic illustration.
Why time-domain NMR

What it adds

  • A quick answer, so a wash can be checked before the next step starts
  • No solvent extraction and no weighing of extracts
  • The same method, and the same instrument, as for finish control on the line
  • Many samples can be compared when optimising a washing recipe
Good to know

Points that matter in practice

  • At low levels the result depends on the fibre and the finish, so the lowest level that can be measured should be established for your own materials
  • Condition the samples in the same way before measuring. Water on the fibres is hard to control and can affect the reading
  • Fabrics can be uneven, so take several pieces and measure them separately
  • The limit that the next treatment needs comes from your own process and trials, and not from the method
How MSY Consulting helps

From your fabric to a routine method

Send or bring representative samples. MSY Consulting runs feasibility measurements, plans the calibration and the limit with you against your reference method, and trains your team until the method is part of your routine.

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Contact

Let's talk about your application

Send an email describing your instrument and your application, and you will get a reply.

contact@msyconsulting.eu

MSY CONSULTING SAS · Wissembourg, France · LinkedIn