produced by a solution of cellulosic material in cuprammonium
hydroxide solution at low temperature in a nitrogen atmosphere, followed
by extruding through a spinnerette into a sulphuric acid solution
necessary to decompose cuprammonium complex to cellulose. This is a more
expensive process than that of viscose rayon. Its fiber cross section
is almost round.
Properties Of Rayon
Properties Of Rayon
- Variations during spinning of viscose or during drawing of filaments provide a wide variety of fibers with a wide variety of properties. These include:
- Fibers with thickness of 1.7 to 5.0dtex, particularly those between 1.7 and 3.3 dtex, dominate large scale production.
- Tenacity ranges between 2.0 to 2.6 g/den when dry and 1.0 to 1.5 g/den when wet.
- Wet strength of the fiber is of importance during its manufacturing and also in subsequent usage. Modifications in the production process have led to the problem of low wet strength being overcome.
- Dry and wet tenacies extend over a range depending on the degree of polymerization and crystallinity. The higher the crystallinity and orientation of rayon, the lower is the drop in tenacity upon wetting.
- Percentage elongation-at-break seems to vary from 10 to 30 % dry and 15 to 40 % wet. Elongation-at-break is seen to decrease with an increase in the degree of crystallinity and orientation of rayon.
- Highly absorbent
- Soft and comfortable
- Easy to dye
- Drapes well