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IS 7703-1 (1990): Methods of Test for Continuous Filamentpolyester filament polyester and polyamide flat yarn, Part1: Linear Density (Superseding IS 1226) [TXD 1: PhysicalMethods of Tests]

-. 8 _:

IS 7703(Partl ) :1990

Indian Standard ( Superseding IS 1226 : 1967 )

METHODS OF TEST FOR MAN-MADE FIBRES CONTINUOUS FILAMENT

FLAT YARN PART 1’ LINEAR DENSITY

( First Revision )

UDC 677’4’071’252’4 : 677’017’272

.

i @ BIS 1990

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

NEW DELHI 110002

August 1990 Pries armlp 1

Physical Methods of Test Sectional Committee, TXD 1

FOREWORD

This Indian Standard ( First Revision ) was adopted by the Bureau of Indian Standards after the draft finalized by the Physical Methods of Test Sectional Committee had been approved by the Textile Division Council.

This standard was first published in 1975 and is now being revised to incorporate changes on the basis of experience gained during its use. In this revision the scope has been enlarged to cover continuous filament flat yarns of all man-made fibres including rayon and acetate instead of poly- ester and polyamide only. It supersedes IS 1226 : 1957 ‘Method for determination of linear density ( mass per unit length ) in denier units ( or tex units ) of continuous filament rayon yarn and acetate yarn’.

Jn the preparation of this standard due weightage has been given to the testing practices followed in the country in this field.

This standard forms a part of the series of standards on methods of test for man-made fibres conti- nuous filament flat yarn. This is Part 1 of the series, other parts are :

Part 2 Tenacity and elongation at break Part 3 Commercial mass Part 5 Unevenness percentage

In reporting the results 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 ‘Rules for rounding off numerical values ( revised )‘.

Its 7703 ( Pwt 1) : 1990

Indian Standard

METHODS OF TEST FOR MAN-MADE FIBRES CONTINUOUS FILAMENT

FLAT YARN PART 1 LINEAR DENSITY

( First Revision ) 1 SCOPE

3.1 This standard ( Part 1 > prescribes the method for determination of linear density of man-made fibres continuous filament flat yarn.

2 REFERENCES

2.1 The following Indian Standards are neces- sary adjuncts to this standard:

- IS No.

1324 i 1966

Title

Glossary of textile terms rela- ting to man-made fibre and fabric industry ( first revi- sion )

6239 : 1990 Textiles-Man-made fibres- Generic names

6359 : 1971 Method for conditioning of textiles

3 TERMINOLOGY

3.1 For the purpose nitions given in IS 1971 shall apply.

4 PRINCIPLE

of this standard, the defi- 1324 : 1966 and IS 6239 :

4.1 The linear density is determined from the mass of a specified length of yarn and expressed in denier or tex. The specimen is first condi- tioned free from tension and length is measured under standard pretension. The specimen is then oven-dried to constant mass and weighed. The commercial moisture regain is then added to the oven-dry mass and the resultant mass is used in calculating the linear density of the specimen.

5 SAMPLING

5.1 Sample to test conformity of a lot to a spe- cification shall be selected so as to be represen- tative of the lot.

5.2 Sample drawn in accordance with the pro- cedure laid down in the relevant material speci- fication or as agreed to between the buyer and the seller shall be held to be representative of the lot.

6 ATMOSPHERIC CONDITIONS FOR CONDITIONING AND TESTING

6.1 Unless otherwise agreed to between the buyer and the seller, the test sample shall be conditioned to a state of moisture equilibrium from the dry side in standard atmosphere at 65 & 2 percent relative humidity and 27 f 2°C temperature ( see IS 6359 : 1971 ).

6.2

NOTE - When a test sample under zero tension has been left in such a way as to expose, as far as possible, all portions of it to the standard atmos- phere for 24 hours, the test sample shall be deemed to have reached a state of moisture equilibrium.

The test shall be carried out in the stand- __. ard atmosphere ( see 6.1 ).

7 APPARATUS

7.1 Pan Balance and Weights

Capable of weighing test specimen to an accu- racy of 0’1 mg.

7.2 Drying Oven

Provided with forced ventilation and positive valve control and capable of maintaining a temperature of 105 rt3”C, preferably provided with a weighing balance. In case the weighing balance ii not provided, a desiccator with a sui- table desiccant and sealed containers of known mass shall be made available.

7.3 Wrap Reel

Capable of winding specific length under requir- ed tension.

8 PREPARATION OF TEST SPECIMENS

8.1 From each conditioned sample, draw suit- able lengths of yarn preferably in multiples of 10 m for tex and 9 m for denier measurement by the wrap reel without alteration of twist under a constant yarn tension of 0’5 f 0’1 c N/ tex so that the mass of each specimen is at least 5 g. Discard a few metres of yarn while taking each specimen. Operate the reel by hand or motor ( preferably the later ) at a speed of 100 to 150 rev/min when reeling out yarn if it is in the skein form, use a speed of 200 to 300 rev/ min for reeling out yarn from packages other

IS 7703 ( Part 1) : 1990

than skeins. Tie the tail end of the skein to its starting end. Measure the length of the yarn to an accuracy of 0’01 percent.

9 PROCEDURE

9.1 Take at least six test specimens, two from each package, one drawn from the inside and one drawn from the outside of the package, except when the yarn is on pirns. When the yarn is on pirns, take at least ten test specimens each reeled off the middle portion of each pirn. Place each test specimen in the ventilated dry- ing oven maintained at 105 f 3°C and fed with air from standard atmosphere. Continue drying until constant mass is obtained.

NOTE - The mass shall be taken as constant when the difference between any two successive weighings made at intervals of 20 minutes does not exceed 0.1 porcent.

9.2 Record the oven-dry mass of each test spe- cimen correct to 1 mg.

10 CALCULATION

10.1 Calculate the linear density for each test specimen by one of the following formulae :

a) Tex =(loo+R) X y

90 M b) Denier = ( 100 -I- R ) X L

where

R = percentage commercial moisture regain of the fibre used in the yarn being test- ed ( see Note ),

M = oven-dry mass of the test specimen in grams, and

L = length of specimen in metres.

NOTE - Unloss othorwiso agreed to b&een the buyer and the seller commercial moisture regain

valuer for various man-made Bbros as given below may be used:

Material ” Commercial Moisture Regain, percent

Polyester 0’4 Polyamide 4.5 Rayon 11’0 Cupro 11’0 Acetate 6’5 Acrylic 1’5 Vinyon ( polyvinyl Zero

chloride ) Olefins Zero Triacetate ( primary j 3.5 Textile glass Zero Modacrylic

Class 1 0.4 Class 2 2’0 Class 3 3’0

10.2 Find out the mean of the linear density values, obtained in 9.1.

11 REPORT

11.1 The report shall include the following in- formation:

a) The nature and composition of the mate- rial to be tested,

b) Linear density in tex or denier units,

c) Number of specimens tested,

d) Commercial moisture regain used,

e) Length of yam taken for each test speci- men,

f) Month and year of manufacture of the material,

g) Product batch number, and

h) Indication of the source of manufacture.

Standard Mark

The use of the Standard Mark is governed by the provisions of the Bureau of Indian Standards Act, 1986 and the Rules and Regulations made thereunder. The Standard Mark on products covered by an Indian Standard conveys the assurance that they have been produced to comply with the requirements of that standard under a well defined system of inspection, testing and quality control which is devised and supervised by BIS and operated by the pro- ducer. Standard marked products are also continuously checked by BIS for conformity to that standard as a further safeguard. Details of conditions under which a licence for the use of the Standard Mark may be granted to manufacturers or producers may be obtained from the Bureau of Indian Standards.

Bureau of Indian Standards

BIS is a statutory institutiou established under the Bureau of Indian Standah Act, 1986 to promote harmonious development of the activities of standardization, marking and quality certification of goods and attending to connected matters in the country.

Copyright

BIS has the copyright of all its publications. No part of these publications may be reproduced in any form without the prior permission in writing of BIS. This does not preclude the free use, in the course of implementing the standard, of necessary details, such as symbols and sizes, type or grade designations. Enquiries relating to copyright be addressed to the Director ( Publications ), BIS.

Revision of Indian Standards

Indian Standards are rZviewed periodically and revised, when necessary and amendments, if any, are issued from time 30 time. Users of Indian Standards should ascertain that they are in possession of the latest amendments or edition. Comments on this Indian Standard may be sent to BIS giving the following reference :

Dot : No. TXD 1 ( 2539 )

Amendments Issued Since Poblication

Amend No. Date of Issue Text Affected

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