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IS 1383 (1977): Methods for determination of scouring lossin grey and finished cotton textile materials [TXD 5:Chemical Methods of Test]

IS : 1383 - 1977 ( Reaffirmed 1993 )

Indian Standard

METHODS FOR DETERMINATION OF SCOtTRING LOSS IN GREY AND FINISHED

COTTON TEXTILE MATERIALS

(First Revision)

Third Reprint SEPTEMBER 1998

UDC 677.21.06 : 677.016.253

0 Copyright 1977

BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

GrZ July 1977

IS : 1383 - 1977

Indian Standard

METHODS FOR DETERMINATION OF SCOURING LOSS IN GREY AND FINISHED

COTTON TEXTILE MATERIALS

( First Revision )

Chemical Methods of Test Sectional Committee, TDC 5

Chairman DR P. C. M~HTA

Representing Ahmedabad Textile Industry’s Research Association,

Ahmadabad

Members DR V. G. AGNIHOTRI DR S. M. BETRABET

DR S. N. PANDEY ( Alternate ) SHRI R. K. BHATNAGAR SHRI B. V. BHA~

SHRI K. G. SHAH ( AIfernote ) DR ( KUMARI) M. D. BHAVSAR

SHRI S. K. Bose SHRI B. B. CHAKRAVERTI

DR N. F. DESAI SHRI K. S. DESIKAN SHRI M. D. DIXIT DR A. S. Dwrr

SHRI V. B. HAJELA

SHRI S. P. KAPUR

Inspection Wing. Directorate General of Supplies & Disposals, New Delhi

Ministry of Defence ( DGI ) SHRI DE~H RAJ YADAVA ( Alternate )

SHRI K. B. KULKARNI Textile Auxiliaries Manufacturers* Association,

National Peroxide Limited, Bombay Cotto&~~a~ogtcal Research Laboratory (ICAR),

Silk & Art Silk Mills’ Association Limited., Bombay Ahmedabad Manufacturing & Calico Prmting Co

Ltd, Ahmadabad

The Silk & Art Silk Mills’ Research Association, Bombay

National Test House, Calcutta Superintendence Company of India (Private) Ltd.

Calcutta Sandoz ( India ) Limited, Bombay Office of the Textile Commissioner, Bombay The Bombay Textile Research Association, Calcutta Indian Jute Industries’ Research Association,

Calcutta

Bombay DR B. R. MANJUNATHA Textiles Committee, Bombay

DR ( SHRIMATI ) G. R. PHALGUMANI ( Alternate )

( Continaed on page 2 )

Q Copyright 1977

BUREAU OF INDIAN STANDARDS

This publication is protected under the Indian Copyright Act ( XIV of 1957 ) and reproduction in whole or in part by any means except with written permission of the nublisher shall be deemed to be an infringement of conyright under the said Act.

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IS : 1383 - 1977

(Continued from page 1 )

Members Representing SHRl S. S. MAW Directorate of Industries, Government of Punjab

SHIU N. S. SWHU ( Afreraare ) SHRI S. M. MIS’I-RY Association of Merchants & Manufacturers of Textile

Stores & Machinery. India, Bombay SHRI R. S. PRAY.40 All India Handloom Board, Bombay SHRI R. RAMAKRISHNAN Binny Limited, Madras

SHRI K. G. KRI~HNWWAMY ( Alternate ) SHRI N. S. SARNYA The Bombay Textile Research Association, Bombay SHRI JAMNADAS K. SHAH SHRI K. M. SHAH

Raipur Manufacturin; Co Ltd. Ahmadabad The Millowners’ Association, Bombay

SHRI R. C. SHAH Ahmedabad Textile Industry’s Research Association, Ahmadabad

SHRI K. S. SRINIVASAN I. C. I. ( India ) Private Limited, Calcutta SHRI R. S. BAJEKAL ( Alternate )

DR R. V. R. SUBRAMANIAN Ministry of Defence ( R & D ) SHRI R. S. AGARWAL ( Alternate )

SHRI S. S. TRIVEDI Ahmedabad Textile Industry’s Research Association, Ahmadabad

SHRI S. M. CHAKRABORTY, Director General, ISI ( Ex-oficio Member ) Director ( Tex )

Secrefary

SHRI D. R. KOHLI Deputy Director ( Tex ). IS1

Chemical Test Methods Subcommittee, TDC 5:14

Convener

SHRI R. C. SHAH Ahmcd.&cd.~aT~dtiL Industry’s Research Association,

Members DR V. G. AGNIHOTIU National Peroxide Limited, Bombay DR ( KUMARI ) M. D. BHAVSAR The Silk & Art Silk Mills Research Association,

Bombay SHRI K. S. DESIKAN O&e of the Textile Commissioner, Bombay DIRECTOR ( LABORATORY ) Textiles Committee, Bombay

Da ( SHRIMATI ) G. R. F’HALGUMANI ( Alfefnafe )

DR S. N. CHOSE Indian Jute Industries Research Association. Calcutta

SHRI K. P. DAS ( AIternute ) SHRI N. S. SARAiYA The Bombay Textile Research Association, Bombay SHRI JAMNADAS K. SHAH Raipur Manufacturing co Ltd, Ahmadabad SHRI R. R. SHANBAGH Wool Research Association, Bombay SHRI L. R. SUO Ministry of Defence ( DGI )

SHRI D. K. SRIVASTAVA ( .4/r~mat~- )

2

IS : 1383 - 1977

Indian Standard

METHODS FOR DETERMINATION OF SCOURING LOSS IN GREY AND FINISHED

COTTON TEXTILE MATERIALS

( First Revision )

0. FOREWORD

0.1 This Indian Standard ( First Revision ) was adopted by the Indian Standards Institution on 18 March 1977, after the draft finalized by the Chemical Methods of Test Sectional Committee had been approved by the Textile Division Council.

0.2 This standard was first published in 1960 and covered a method of test for determining scouring loss which is considered to be severe for fabrics like cotton gauze, bandage cloth and fabrics of loose cons- truction. This standard has been revised to cover another method which is a milder method compared to the existing one and is widely used in the industry. The existing method has also been modified slightly on the basis of experience gained during its use.

0.3 In the cotton textile industry, yarns and fabrics undergo treatments in the course of which extraneous matter of various types is gathered by or added to the original material which if it is not scoured or is partly scoured may also contain natural impurities, such as oils, fats, waxes, and pectins. Formulation of standard methods of test for determining the quantity of natural impurities and extraneous matter present in the material is, therefore, necessary.

0.4 In reporting the result of a test made in accordance with this standard, if the final value, observed or calculated is to be rounded off, it shall be done in accordance with IS: 2-1960*.

1. SCOPE

1.1 This standard prescribes two methods for determining the muring loss ( loss in mass on scouring) of grey and finished cotton textile materials.

*Rules for rounding otf numerical valuer (revhf ).

3

IS : 1383 - 1977

1.2 The methods prescribed in this standard are generally applicable to grey and finished cotton textile materials wherein only starch or tamarind kernel powder or both, and water-soluble or easily removable finishing agents, such as oils, fats, and china clay, have been used and which would normally be removed during the scouring process.

2. PRINCIPLE

2.1 The test specimen is taken and its moisture content is determined. Another test specimen is scoured, washed and its oven-dry mass is deter- mined. The scouring loss is calculated on the basis of oven-dry mass of the test specimen.

3. SAMPLING

3.1 Sample shall be selected so as to be representative of the lot. Sample drawn in accordance with the procedure laid down in the specification of the material or as agreed to between the buyer and the seller shall be taken as representative of the lot.

4. APPARATUS

4.1 Soxhlet Apparatus

4.2 Drying Oven -capable of maintaining a temperature of 105f3”C.

4.3 Weighing Balance - capable of weighing to an accuracy of O*OOl g.

5. REAGENTS

5.1 Unless specified otherwise analytical reagent grade chemicals shall ‘be employed in test and distilled water ( see IS: 1070-1960* ) shall be used where the use of water is intended.

5.2 De&zing Enzyme - Diastase ( or other suitable enzyme ).

5.3 Sodium Chloride - Solid.

5.4 Caustic Soda Solution - 2 percent (m/v), containing, 1 percent turkey red oil Grade 2 ( total fatty matter, percent by weight, Min 50 percent ) conforming to IS : 1044-1970t.

5.5 Acetic Acid Solution - 1 percent ( Y/P ).

5.6 ChIoroform

*Specification fur water, distilled quality ( revised ). tdpccification for turkey red oil ( first revhm ).

4

IS : 1383 - 1977

6. ESTIMATION OF MOISTURE

6.1 Draw from the sample ( see 3.1 ) at least 2 test specimens ( see Note ), each weighing approximately 3 g. Take one test specimen and weigh it accurately in a clean, dry and tared weighing bottle. Place the weighing bottle containing the test specimen in the drying oven and dry the specimen at 1054~3°C to constant mass. Weigh the oven-dry specimen accurately. Calculate the percentage of moisture in the test specimen, by the following formula:

Moisture content, percent = a (a---b) x 100

where

a = original mass, in g of the test specimen; and

b = oven-dry mass, in g of the test specimen.

NOTE - If the samples under test is fabric, the specimens drawn shall preferably be square in shape.

6.2 Similarly determine the moisture content in the second test specimen and take the average of the two values.

7. PREPARATION OF TEST SPECIMENS

7.1 Draw from the sample at least two test specimens each weighing about 5 g. If the sample under test is yarn, cut each test specimen, separately into pieces about 15 cm long, form into separate bundle and tie each bundle loosely round the middle. If the sample under test is fabric, trim each test specimen parallel to the directions of warp and weft and pull out, to form a fringe, 5 threads all round.

8. PdOCEDURE

8.1 Method A ( Severe Method )

8.1.1 Weigh accurately one test specimen drawn. as in 7.1. Dip the specimen in a solution ( weighing 20 times the mass of the specimen), containing, 5 g of diastase and 10 g of sodium chloride per litre, at 50°C and at a pH of 6.5 to 7’7 ( see Notes 1 and 2 ). Allow the specimen to remain in the solution for 13 hours. Puring this period, take it out from the desizing bath and wring it by hand four times. At the end of the period, remove the specimen, wash it thoroughly ( without wringing) four times in hot and cold water successively, using 50 ml of water for each wash.

NATE 1 -The temperature and pH given for the desizing solution are the optimum for bacterial diastase. If any other type of desizing enzyme is used, then the temperature and pH should be modified to that recommended by the supplier. As many enzymatic desizing agents slowly deteriorate in storage, great care shou!d be taken to see that the sample of desizing agent, at the time of test, is of satisfactory desizing efliciency.

5

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Is:1383-1977

NOTE 2 - If any doubt exists as to whether the size or finish has been completely removed, the treatment with the enzymatic desizing solution should be repeated, the specimen being again weighed after drying to constant mass at 105&3”C and the percentage loss in mass again calculated. If the percentage loss in mass has increased by not more than 0.25, then it may be considered that complete desizing has been affected and the second figure be accepted as the final figure. If the percentage loss in mass has increased by more than 025, then the desizing treatment should be repeated until the figure for percentage loss in mass does not differ from the previous figure by more than O-25.

8.1.2 Put the specimen in a 500 ml conical flask containing caustic soda solution weighing 20 times the mass of the specimen and boil for one hour. Add adequate quantity of water to make up for the loss during boiling. At the end of the period remove the specimen, wash it thoroughly ( without wringing) in hot water and dip it for 5 minutes in acetic acid solution. Finally wash ( without wringing ) the specimen in cold water. Dry the specimen in drying oven at 105&3”C to constant mass and weigh it accurately.

8.2 Method B ( Mild Method )

8.2.1 Weigh accurately one test specimen drawn as in 7.1. Extract the specimen for one hour with chloroform in a soxhlet apparatus at the rate of 6 cycles per hour. Allow the chloroform to dry off in the air, and wash the specimen by alternate immersion in hot running water and wringing by hand 12 times in succession. Immerse the specimen in 0’5 percent aqueous solution of diastase ( 20 to 30 times the mass of the specrmen ) at 50°C and wring by hand repeating the process three times in succession. Finally, return the specimen to the solution and heat to 70°C. Allow the specimen to remain in the solution for 15 minutes and then wash it well in hot running water. Squeeze and dry the specimen at lOSf3”C and weigh accurately.

9. CALCULATION

9.1 Calculate the percentage of scouring loss by the following formu!a:

Scouring loss, percent = M*-s

> ( oven-dry basis ) I__ M,m\

where

M, = original mass in g of the specimen;

m = moisture content, percent ( see 6.2 ); and

M* = oven-dry mass in g of the specimen after ( see 8.1 or 8.1).

6 , !

treatment

is:1383-1977

9.2 Repeat the test with the remaining test specimen(s) and find out the average of all the values.

lO.REPORT

10.1 The report shall include the folIowing information:

a) Type of material;

b) Method used ( A or B);

c) Scouring loss, percent; and

d) Number of test specimens tested.

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