Saturday, 26 July 2008
FAQ in Spinning-1
Q. Why cotton is convoluted in crosssection when seen through microscope
Cotton fibres grow on hairs on the seed of the plant. While growing the fiber is cylinderical in form, but as it dries it twists, and, when fully ripe, resembles a narrow twisted ribbon.
Q. What is the best variety of cotton in the world
The best variety in the world is sea Island cotton which is fine, long and silky and is suitable
for the finest of counts namely 120s and beyond.
Q. What is a bale
For transporting the ginned cotton in a suitable economic and compact package form we need a
package known as a bale.
Q. Why baling is called a necessary evil.
Because processing of baled cotton requires the use of greater number of blowroom machines than are required when directly ginned cotton is used.
Q. What will happen if the cotton in bale form is stored for longer periods.
Cotton stored for longer periods, from 6 months to one year have been found to give more waste
losses ranging from 2-3% due to weather effects and compressional strains.
Q. Chemically, what is cotton fibre made of
Chemically, a cotton fiber consists of about 92% cellulose, 7% water, 0.6% nitrogen and remaining in wax, ash and fat.
Q. What is the importance of convolutions.
Convolutions help to increase the inter-fiber cohesion. Loss in convolutions have to be
compensated by slightly more twist during spinning for a desired yarn strength.
Q. What is the importance of natural wax present on cotton as regards to spinning.
It lubricates the fibers and helps in the spinning process.
Q. Why moisture is important for cotton.
Bone dry cotton is harsh and brittle with a low tensile strength. Cotton is a poor conductor of
electricity and hence it is difficult to spin very dry cotton as it develops static electricity.
Q. How fiber fineness is important for cotton spinning.
Fibres that are longer and finer are best suited for producing fine counts.
Q. What is length to diameter relationship in case of cotton.
The ratio of length to diameter for cotton varies from 500:1