Tuesday, 28 April 2015

Filled Under: , , , ,



Mercerization is a completing treatment of cotton with a solid caustic basic arrangement to enhance the brilliance, hard and different properties, was names after its pioneer, John Mercer, and has been being used for at some point. It has been seeing an increment in application as of late. 

Impact of Mercerization: 

Enhance Shine. 

Expand capacity to ingest color. 

Enhance response with a verity of chemicals. 

Enhance dependability of structure. 

Enhance quality/stretching. 

Enhance smoothness. 

It has been demonstrated that the increment in the brilliance happens in view of an impact. 

The cotton fiber do convoluted. 

The cross-sectional shape changes.

Improvement of Mercerizing
The treatment comprises of drenching the yarn or fiber in an answer of sodium hydroxide (burning soda) for brief times of time, typically under four minutes. The material is then treated with water or acid to kill the sodium hydroxide. On the off chance that the material is held under pressure during this stage, it is kept from contracting considerably; if no strain is connected, the material may contract by as much as one-fourth. Higher-quality cotton products are normally mercerized; materials so treated take brighter, longer-enduring colors from less dye. The impact of scathing soda on cotton was found in 1844 by John Mercer, an English calico printer, who got a patent for it in 1850.

Mercerisation modifies the concoction structure of the cotton fiber. The structure of the fiber between proselytes from alpha-cellulose and beta-cellulose mixture to a thermodynamically positive cellulose II polymorph. Mercerising results in the swelling of the phone mass of the cotton fiber. This causes increment in the surface region and reflectance, and gives the fiber a gentler feel. A discretionary last stride in the process is ignoring the string an open fire; this burns stray fibers, improving the fabric's appearance. This is known as "gassing the string" because of the gas burner that is commonly utilized.

Components of Mercerizing: 

In mercerizing followings are essential:

1. Twaddle

2. Temperature

3. Pressure

4. Time

(1) Twaddle (Centralization of NaOH): 
In the event that the amassing of NaOH is expanded over 56oTw change in shine will be achieved yet in the event that it is reduction beneath 48o Tw. The nature of brilliance will start to be antagonistically influenced.

(2) Temperature:
High level of brilliance is accomplished at temperature 18-20oC. As the temperature is expanded the nature of shine is antagonistically influenced yet on bringing down the temperature no change in the gloss is acquired.

(3) Strain: 
For securing better gloss the material must be extend to its unique measurement (both in twist and weft course amid mercerization). In the event that the material is permitted to psychologist amid mercerizing then nature of gloss will be impeded then again if the material is extended all the more no change in brilliance is attained to.

(4) Time: 
The ideal time for mercerizing is 30-60 seconds by expanding the term of time no pertinent change in the nature of mercerization can be attained to yet in the event that as far as possible is under 30 seconds in the nature of mercerization will be made strides.


Post a Comment