It is the significant characteristic of cotton fibres. Matur,ity of cotton fibre is an indicator which expresses "the degree of development of cotton fibre". The maturiy of fibres tells us how much development has been taken place in the fibres. The cotton fibres do not have regular development within the sample or the fibres obtained from same seed too. This difference among the maturity of various fibres appears becauses of the variations in the degree of the secondary thickening or deposition of cellulose in a fibres.
In mature fibres, "the secondary wall's thickness is very high". In the some fibres, the lumen gets invisible too.
In the immature fibres, due to some physiological reasons, the secondary deposition of cellulose has not taken sufficiently and in maximum fibres, the secondary thickening is practically gets absent.
The presence of immature fibres appears as a defect in yarn, grey fabric, and processed fabric. "Excessive neps" appear on the yarn surface if the cotton have immatured fibres in it. The neps appearing in this yarn "influence the appearance of the fabric greatly".
The presence of excessive degree of immature fibres in the yarn results in the form of "weight losses in processing". The balls of immatured fibres appearing on the fabric surface require "extra dose of caustic soda and hydrogen peroxide" to desolve the same during processing. This extra dose of chemicas causes increase in the" processing cost".
The presence of excessive immatured fibres also "influences the gsm of finished fabric". Due to excessive weight loss occurring during dyeing, the gsm is of the processed fabric decreased.
The presence of the immatured cotton fibres in the fabric also influences the "dyeing affinity" of the fabric. The immatured fibres have very poor dyeing affinity. The colour of dyed fabric get "uneven" if excessive immatured fibres are present in the fabric.
Now the observations are recorded accurately. After competition of observation process, the fibres are classified into different maturity groups depending upon the basis of the relative dimensions of wall-thickness and lumen of the fibres. However the procedures followed in different countries for sampling and classification differ in some respects. The swollen fibres are classed into three groups as follows
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