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Barium Activity Number (BAN) | Mercerization Test of Fabric

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Barium Activity Number:
The ability of mercerized cotton fibre to absorb more iodine, dyes, moisture and alkalis, and to undergo oxidation or hydrolysis at increased rates compared to unmercerized cotton, has been used to develop various methods of determining the degree of mercerization. The most successful method consists of measuring preferential absorption of barium hydroxide from its dilute solution by mercerized cotton. The extent of this absorption is more than that by unmercerized cotton under the same conditions. Thus ratio multiplied by 100, is known as barium activity number, barium number or baryta number.

Barium activity number was measured by AATCC test method 89-1998. One gram of mercerized and unmercerized cotton yarns were each cut into small pieces, dried over phosphorous pentoxide for 5 hours, then conditioned at 65% relative humidity at 31̊Cbefore testing and consequently treated with 30 ml of 0.25 N barium hydroxide solution in 100 ml conical flasks. After2 h, 10 ml of the solution is titrated against 0.1 N hydrochloric acid. A blank is also run without any yarn sample. For b, s and u being the titration readings of the blank, mercerized and unmercerized samples, respectively, the barium activity number may be given as in following equation.

Barium activity number = {(b-s)/(b-u)} × 100

Appropriately large numbers of conditioned samples are taken, taking into consideration the moisture regain of the samples. Thus, if the moisture regains 8%, 1.08g of the conditioned cotton is weighted to get 1g of the bone dry cotton. The barium activity number of good mercerized cotton may be around 150-160.

Author of This Article:



MD. JASIMUDDIN MANDAL
COLLEGE: GOVT. COLLEGE OF ENGINEERING AND TEXTILE TECHNOLOGY, SERAMPORE (UNDER WEST BENGAL UNIVERSITY OF TECHNOLOGY)
Email ID: jasimmandal@gmail.com
Contact: +8820662240






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