Disclosure to Promote the Right To Information

Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public.

इंटरनेट मानक

“!ान $ एक न' भारत का +नम-ण”Satyanarayan Gangaram Pitroda

“Invent a New India Using Knowledge”

“प0रा1 को छोड न' 5 तरफ”Jawaharlal Nehru

“Step Out From the Old to the New”

“जान1 का अ+धकार, जी1 का अ+धकार”Mazdoor Kisan Shakti Sangathan

“The Right to Information, The Right to Live”

“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता है”Bhartṛhari—Nītiśatakam

“Knowledge is such a treasure which cannot be stolen”

“Invent a New India Using Knowledge”

है”ह”ह

IS 14379 (1996): Textiles- Grading of Cotton [TXD 31:Man-Made Fibres, Cotton and their Products]

IS 14379 : 1996

Indian Standard

TEXTILES -- GRADING OF COTTON

ICS 59.060.10

0 BIS 1996

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

Nl% DELHI 1 KlOO2

Septernb-ev 1996 Price Group 1

Cotton and Cotton Products Sectional Committee. TX 02

FOREWORD

This Indian Standard was adopted by the Bureau of Indian Standards, after the draft finalized by the Cotton and Cotton Products Sectional Committee had been approved by the Textile Division Council.

This standard is based on extensive studies carried out by Central Institute for Research on Cotton Technology and East India Cotton Association. Evaluation and grading of cotton according to various requirements will help the trade in following a rational system which will not only help the mill sector but also the ginning factories.

For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, expressing the result ~of a test, shall be rounded off in accordance with IS 2 : 1960 ‘Rules for rounding off numerical values (revised)‘. The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard.

Indian Standard

TEXTILES - GRADING OF COTTON

1 SCOPE

1.1 This standard prescibes~details for grading of cotton ( lint cotton) according to various requirements.

2 REFERENCES

2.1 The following Indian Standards are necessary adjuncts to this standard:

IS No. Title

233 (Part 6) : 1978

Methods for determination of length parameters of cotton fibres : Part 6 Estimation of length and length uniformity by the optical scanning method

4871: 1968

4905: 1968

4952: 196X

Method for determination of lint and trash content of cotton by means of mechanical pneumatic machines

Method for random sampling

Methods for sampling of cotton bales. slivers and rovings

3 TERMINOLOGY

3.1 Span Length

The minimum length attained by a specified percentage of the fibres in a randomly aligned representative tuft. that is in a test beard corresponding to a

Category 2.5 Percent Span

Length Range in mm

Short 20 and below

Medium 20.5 to 25.5

Medium long

Long

26.0 to 27.5

28.0 to 33.5

Extra long 34.0 and above

determined percentage of the oftical density of the beard. Thus 2.5 percent span length is the length exceeded by only 2.5 percent of the total number of fibres in the tuft; similarly, 50 percent span length is the length exceeded by only 50 percent of the tibres.

3.2 Trash

Foreign matter excluding abnomtal items such as stone. timber. pieces of old iron, cte. present in raw cotton

NOTES

1 Normal whole seeds, either ginned or unglnned.

generally do not form part of trash. However, broken

portions of seeds and also whole or broken undeveloped

seeds are usually regarded as trash.

2 The mam component of trash is chaff including hits

of seeds, leaves and stem. Dirt in the form of soil or

sand is another component oftrash. Frapmcnts of foreign fihres such as sisal. pk. hemp. etc. are sometimes regarded

as trash hut usually receive special reference when easil?

recognizable

4 GRADlNG

The lint cofion shall bc classified into different grades on the basis of the followng charactcrrstrcs:

a) Stop/e /,enpth - 2.5 percent span length determined by the Digital fibrcgraph as per IS 233 (Part 6) : 1978 shall bc the measure of staple length. The cotton shall be graded in S categories depending upon the length as under:

Approxrrnate Equrvalent Value

inches in units of’ 1132 of an mch

0.80 and below 25 and below

0.81 to 1 .oo 26 - 32

1.01 to 1.08 33 - 31

1.10 to 1.32 35 - 42

1.34 and above 43 and above

IS 14379 : I996

b) Trash Content - The cotton shall be graded on the basis of trash content into 6 grades. The maximum permissible trash content of different grades when tested as per IS -4871 : 1968 shall be as under:

Grade Trash Content, Max Percent

1 3.0

2 4.5

3 7.0

4 9.5

5 12.0

Samples containing over 12.0 percent trash shall be classified as Grade 6.

c) Colour - Grading of cotton on the basis of colour shall be as under:

- White

- Cream

- Yellowish

- Deep Yellow

- Greyish

5 REPORT/LABEL

The report/label shall contain the following information:

a) Name of the variety,

b) Lot number,

c) Gross mass of bale,

d) Grade (on the basis of trash content),

e) Staple length (2.5 percent span length), and

f) Any other relevant information.

6 SAMPLING

6.1 The lint cotton of one variety having uniform characteristic~s offered for sale at one time shall constitute a lot.

6.2 Samples for determination of 2.5 -percent spun length and trash content shall be drawn from 2 percent of the bales in the lot. To ensure the randomness of selection of the bales, IS 4905 1968 may be used.

6.2.1 From each of the bale so selected the representative material may be drawn in accordance with 3.2.1 and 3.2.2 of IS 4952 : 1968.

6.3 All sample shall meet the requirements of staple length and trash content for the grade declared in the report/label attached to the bales.

2

Bureau of Indian Standards

BIS is a statutory institution established under the Bureau oflndian StandardsAct. 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.

Review of Indian Standards

Amendments are issued to standards as the need arises on the basis of comments. Standards are also reviewed periodically; a standard along with amendments is reaffirmed when such review indicates that no changes are needed; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standards should ascertain that they are in possession of the latest amendments or edition by referring to the latest issue of ‘BIS Handbook’ and ‘Standards : Monthly Additions’.

This Indian Standard has been developed from Dot : No. TX 02 ( 269 ).

Amendments Issued Since hblieation

Amend No. Date of Issue Text Affected

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