 | Warp sizing is the most important textile application for Finnfix CMC. Its good water solubility, excellent film-forming characteristics and stable solution viscosity make it an efficient sizing agent. Furthermore, modern jet looms have made yarn strength even more crucial and this has contributed to continuous use of Finnfix CMC in textile sizing. Normally medium to low viscosity grades are used, depending on the dimensions of the yarn.
In sizing synthetic yarn blends (polyester and cotton), Finnfix CMC is often used in combination with a synthetic sizing agent such as polyvinyl alcohol (PVOH) to provide the desired degree of added size film adhesion.
Yarn dimension is of great importance when selecting the most suitable Finnfix grade for use in sizing. As a rule of thumb: a lower viscosity CMC grade should be used for smaller yarn dimensions.
Some guidelines are summarised below. In these cases, Finnfix is used as the sole sizing agent.
| Warps of 100% cotton yarns |
| Yarn count, Nm | Suitable Finnfix grade |
| 100-50 | Finnfix 10 |
| 50-33 | Finnfix 30 |
| 33-25 | Finnfix 150 |
| 25- | Finnfix 300 |
| Polyester/cotton (viscose) blends, 67/33 and 50/50 |
| Yarn count, Nm | Suitable Finnfix grade |
| 100-33 | Finnfix 10 |
| 33- | Finnfix 30 |
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