How much finish is on the yarn
Spin finish and other oils are applied to fibres to help them run through machines and to control friction and static. Too little causes breaks and fuzz. Too much causes build-up and problems in later processes. The amount on the fibre is one of the most important control parameters in fibre production and processing.
Where it is used
- Yarns, filaments and staple fibres, natural or manufactured
- Non-woven materials
- Technical yarns and tyre cord with an elastomer dip
- Monofilaments with very low levels of finish
Typical tasks are checking incoming yarn, controlling the application on the line, checking how evenly the finish is distributed, proving that a finish has been removed by washing before a further treatment, and checking the dip on a technical yarn. The last two have their own pages in this section.
Fill the tube, measure, read
The yarn or fibre is placed in a tube as it is. The signal of the finish is separated from that of the fibre by how quickly it fades, and a calibration turns it into a percentage. A measurement takes about a minute and needs no solvent extraction. For technical yarns with an elastomer dip, a measurement that takes about an hour replaces a procedure of stripping and weighing that takes many hours.
In-house methods
These are application methods that are calibrated for each fibre and finish combination. There is no international standard for them. The calibration is made against the extraction or weighing method that your laboratory trusts.
What it adds
- No solvent extraction, no weighing steps and no solvent waste
- Short measurement time, suitable for control on the line
- Works on low finish levels, down to monofilaments
- Non-destructive, so the sample can be tested again
Points that matter in practice
- A calibration is needed for each combination of fibre and finish, using a small set of samples that cover the expected range
- Condition the samples in the same way before measuring. Water on the fibres is hard to control and can affect the reading
- Take samples that represent the package or the batch, since the finish can vary along a yarn
- The method measures the amount of finish. It does not tell what the finish is made of
From your fibres to a routine method
Send or bring representative samples. MSY Consulting runs feasibility measurements, plans the calibration with you against your reference method, and trains your team until the method is part of your routine.
Let's talk about your application
Send an email describing your instrument and your application, and you will get a reply.
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