CMC can act as sizing agent for warp sizing to achieve ideal sizing and weaving effect. According to different viscosity, purity and degree of substitution, there are different CMC suitable for sizing technology of different kinds of yarns. Derived from natural cellulose (refined cotton or wood pulp), CMC is biodegradable, and there are no toxic substances or pungent odor when sizing.
CMC can form solutions with different viscosity based on different grades and concentration. When CMC on the surface of the warp is dried, it can form a firm, tough film with soft and wear-resistant characteristics. It has good adhesion to the surface of the fiber, and at the same time can make the warp yarns have elongation feature. In weaving, the sizing film on the warp not only increases the strength of the warp on the loom, but also reduces the size shedding rate.
As the thread count increases, CMC concentration also needs to change to accommodate the increase in weaving tension. The viscosity of the seriflux should conform to specific warp and fabric parameters and should decrease with increase in density and yarn count to obtain optimal sizing permeability. Keeping a balance between concentration, seriflux viscosity and sizing rate can ensure reasonable size shedding rate and good adhesion between sizing film and yarn.
Both CMC and sodium alginate are stable under acidic conditions and can be used in textile sizing. However, when under high pH value, the viscosity of sodium alginate solution decreases significantly. If stored for two weeks, the concentration of sodium alginate solution decreases by more than four times, while the CMC solution shows only a slight change in viscosity. CMC’s salt-resistance and acid resistance make it a good thickener for various textile printing paste.
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