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है”ह”ह

IS 13684 (2006): Textiles - Rotor spun grey cotton yarn[TXD 31: Man-Made Fibres, Cotton and their Products]

IS 13684:2006

Indian Standard

TEXTILES — ROTOR SPUN GREY COTTON YARN —SPECIFICATION

(First Revision)

lCS 59.080.20

(3 BIS 2006

BUREAU OF INDIAN STANDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

February 2006 Price Group 3

Jll_... . -., . . . .

—.... — .–—&..- -’.’

I

B

Man-Made Fibres, Cotton and Their Products Sectional Committee,TX31

FOREWORD

This Indian Standard (First Revision) was adopted by the Bureau of Indian Standards, after the drafi finalized bythe Man-Made Fibres, Cotton and Their Products Sectional Committee had been approved by the Textile DivisionCouncil.

The rotor spinning technique is ideally suited for spinning yam from short staple cotton. Normally, for use indurries, carpet backing, furnishing, etc, very coarse cotton yarns are produced using waste mixings. However formaking denims, drills, sheetings, towels, etc, cotton yarn are produced by using better mixings which is mostly100 percent virgin cotton. The growing use of rotor spinning technique in production of yarn necessitated theformulation of this standard. The standard is now being revised to incorporate the requirements of better qualityof yarn being manufactured with the use of advanced technology with emphasis on export market.

The composition of the Committee responsible for the preparation of this standard is given in Annex C,

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 or analysis, shall be rounded off in accordance withIS 2: 1960 ‘Rules for rounding off numerical values (revise@)’,The number of significant places retained in therounded off value should be the same as that of the specified value in this standard.

IS 13684:2006

Indian Standa~d

TEXTILES — ROTOR SPUN GREY COTTON YARN —SPECIFICATION

(First Revision)

1 SCOPE

1.1 This standard specifies the requirements of greycotton yarn spun by rotor spinning process.

1.2 This standard does not cover yarn produced fromblends of cotton with man-made fibres or other fibres.

2 REFERENCES

The standards listed in Annex A contain provisionswhich through reference in this text, constituteprovisions of this standard. At the time of publication,the editions indicated were valid, All standards aresubject to revision and parties to agreements based onthis standard are encouraged to investigate thepossibility of applying the most recent editions of thestandard indicated in Annex A.

3 TERMINOLOGY

For the purpose of this standard the followingdefinitions shall apply.

3.1 Grey Cotton Yarn — Cotton yam as it leaves thespinning frame, without any bleaching, dyeing orfinishing treatment and in case of open-end yarn, waxedor not waxed.

3.2 Lea — A continuous length of yarn measuring109.73 m (120 yd) in the form of a coil having 80 wrapswound on a reel of 1.37 m (1.5 yd) girth.

3.3 Lea Breaking Load — The breaking load of a leadetermined on a pendulum type testing machine, therate of traverse being 300 + 15 mm/min.

3.4 Count Lea Strength Product (CSP) — A numberobtained by the following relationship:

CSP = breaking load of a lea, in kg x cotton countX2.2046

3.5 Cotton Count (Ne) — The number of hanks eachmeasuring 768 m (or 840 yd) in 453.6 g (or 1 lb).

3.6 Tex — A number indicating the mass in grams ofone kilometer of yarn, the relationship between thecotton count (Ne) and the tex being as under:

Tex = 590.5/Ne

3.7 Rotor Yarn — Yarn spun on an open-end spinninglmachine wherein the individualization of fibres and

assembling of fibres are done and the real twist iseffected by a rotor.

3.8 Single Yarn Tenacity — Tensile stress of a singlestrand at rupture expressed as force per linear densityof the unstrained specimen expressed usually ascN/tex (gf/tex).

3.9 Virgin Cotton Mixings (New Cotton) —Consisting of more than 65 percent raw short staplecotton and rest superior comber noils.

3.10 Waste Cotton Mixings — Consisting of cottonfrom yellow pickings, blowroom droppings, flat stripsand comber noils mixed in suitable proportions. It mayinclude short staple virgin cotton to the extentof35 percent.

4 REQUIREMENTS

4.1 Rotor Spun Yarn

The rotor spun grey cotton yarn shall comply with therequirements given in Table 1or Table 2. However theaverage count of yarn shall be as agreed to betweenthe buyer and the seller with a tolerance of 53.0 percentpermissible on the count of yarn when determined asper the method prescribed in IS 1315.

4.2 Freedom from Defects

The yarn shall be reasonably free from leaf particles,neps, snarls, slubs, loose ends, knots and stains. Thereshall be no loose ends in the yarn package. A list ofcommon defects of conelcheese yarn is given inAnnex B.

4.3 Moisture Regain

If agreed to between the buyer and the seller, themoisture regain shall not exceed 8.5 percent.

4.3.1 The moisture content shall be determined by themethod prescribed in IS 199. The moisture content sodetermined shall be converted to moisture regain usingthe formula:

MR =100x MC

100-MCwhere

A4~= moisture regain percent, and

Mc = moisture content percent.

1

1S 13684:2006

Table 1 Rotor Spun Grey Cotton Yarn (Waste Cotton)

(clause4.1)

SINo.

(1)

Oii)iii)iv)~)vi)vii)viii)

Requirements Count of YarnA

/ \

>118 tex 59.0-98.4 tex 36.9-53.7 tex 29,5-34.7 tex 28.1 tex(< 5s) (6s-10s) (11s-16s) (17s-20s) (21s)

(2) (3) (4) (5) (6) (7)

Count CV percent, Max 2.00 2.20 2.20 2.50 2.50CSP, &fin 1600 I500 1500 1400 1400Lea breaking load CV percent, Max 5.5 6.0 6.0 6.5 6.5Yarn tenacity cN/tex 9.5 9.0 9,0 8.5 8.5Yarn tenacity CV percent, Max 11.0 11.0 11.0 11.5 11.5Unevenness percent, Max 12.00 12.50 13.00 14.00 14.00Unevenness CV percent, Max 15.0 15.6 16.3 17.5 17,5Imperfections/km

Method of Test,Ref to

(8)

Is 1315IS 16711S 1671[S 1670IS 1670See Notes 1 and 2

See Note I‘Ilin o 0 5 10 15Thick 90 150 I75 200 225Neps 50 100 120 140 160Total 140 250 300 350 400

NOrES

I If agreed to between the buyer and the seller, the unevenness percentage (U percent) (see also Note 2) and the imperfections/km ot’the yarn on packages shall not exceed the values mentioned above. The test shall be carried out at a speed of 400 m/min and atsensitivity level of–50, +50 aod +280 percent for thin places, thick places and neps respectively. Tbe speeds and sensitivity level arespecified based on the most popular instrument for determining evenness used in the testing for yarn. The present internationalpractice for estimating neps in rotor spun yarn is at sensitivity level of+280 percent. The values for neps given are for the sensitivitylevel of+280 percent. The speed and sensitivity levels may be altered subject to tbe agreement between the buyer and tbe seller.However the requirements mentioned above shall apply.

2 The unevenness percent can be expressed as coefficient of variation of unevenness using the formula:

CV percent -1.25 x U percent

Table 2 Rotor Spun Grey Cotton Yarn (Virgin Cotton)

(Cfazrse4.1)

SINo.

(1)

i)ii)iii)iv)v)vi)vii)viii)

Requirements Count of Yarn Method of Test,

- Ref to/ \

> l18tex 59.0-98.4 tex 36.9-53.7 tex 29.5-34.7 tex 28.1 tex

(2)

Count CV percent, MaxCSP, Mirr

Lea breaking load CV percent, MaxYarn tenacity cN/tex, JfinYarn tenacity CV percent, MaxUnevenness percent, MaxUnevenness CV percent, MaxImperfections/km

(< 5s)

(3)

1.801800

5.010.510.510,012.25

(6s-10s)

(4)

2.001750

5.5Io.o10.5010.012.50

(11s-16s)

(5)

2.001700

5.5I0.010.5010.513.10

(17s-20s)

(6)

2.201650

6.09.5

11.010.513.10

(21s)

(7)

2.201600

6.09.5

11.012.015.00

(8)

ls 13151S 1671IS 1671IS 1670IS 1670See Notes 1 and 2

See Note IThin o 2 5 10 15Thick 30 35 50 60 75Neps 15 28 40 60 85Total 45 65 95 130 I75

NOTES

1 If agreed to between the buyer and the seller, the unevenness percentage (U percent) (see also Note 2) and the imperfections/km ofthe yarn on packages shall not exceed the values mentioned above. The test shall be carried out at a speed of 400 m/min and atsensitivity level of–50, +50 and +280 percent for thin places, thick places and neps respectively. The speeds and sensitivity level arespecified based on the most popular instrument for determining evenness used in the testing for yam. The present intemrrtionalpractice for estimating neps in rotor spun yarn is at sensitivity level of+280 percent. The values for neps given are for the sensitivitylevel of +280 percent. Tbe speed and sensitivity levels may be altered subject to the agreement between the buyer and the seller.However the requirements mentioned above shall apply.

2 The unevenness percent can be expressed as coefficient of variation of unevenness using the formula:

CV percent -1.25 x U percent

2

5 MARKING

5.1 Each cone/cheese of yarn shall be marked with thefollowing information:

a)

b)

c)

d)

e)

f)

Count of yarn;

The words ‘ROTOR SPUN YARN, 100percent COTTON’;

The word ‘VIRGIN’ or ‘WASTE’ in case theyarns are manufactured from virgin or wastecotton;

Net mass of yam in package;

Indication of the source of manufacture;and

Any other information required by the buyeror by the law in force.

5.2 The bulk packing shall also be marked with thefollowing information:

a)’

b)

c)

d)

e)

f)

g)

h)

Count of yarn;

The words ‘Rotor spun yam, 100 percentcotton;The word ‘VIRGIN’ or ‘WASTE’ in case theyarns are manufactured from virgin or wastecotton;

No. of coneslcheeses in the packing;

Net mass of yarn in the bulk packing;

Gross mass of the bulk packing;

Indication of the source of manufacture;and

Any other information required by the buyeror by the law in force.

5.3 BIS Certification Marking

The conelcheese of yam and bulk packaging may alsobe marked with the Standard Mark.

5.3.1 The use of the Standard Mark is governed by theprovisions of the Bureau ofIndian Standards Act, 1986and the Rules and Regulations made thereunder. Thedetails of conditions under which the licence for theuse of Standard Mark maybe granted to manufacturersor producers maybe obtained from the Bureau of IndianStandards.

6 PACKING

Unless otherwise agreed to between the buyer and theseller, the yam shall be packed in accordance with theprocedures laid down in any one of the Indian Standardsgiven below:

a) IS 293

b) IS 1347

c) IS 3086

d) IS 3325

IS 13684:2006

7 SAMPLING

7.1 Lot

In any consignment the bales or cases containing yarnof the same type and of the same nominal count shallconstitute a lot.

7.2 Samples shall be drawn from each lot to determineits conformity with the requirements of the standard.

7.3 Unless otherwise agreed to between the buyer andthe seller the number of cases or bales to be selectedfrom a lot shall be in accordance with Table 3. Thebales or cases shall be selected at random, and in orderto ensure the randomness of selection, guidance maybe obtained from IS 4905.

Table 3 Sampling

S1 No. Lot Size SampleSize

(1) (2) (3)

i) up to 3 1

ii) 4to 10 2

iii) llto30 3iv) 31t050 5

v) Over 50 8

7.3.1 At least 10 packages, in case two or less bales orcases selected in the sample, and five packages ifotherwise, shall be drawn at random from each of theselected bale or case. The number of leas to be preparedfrom each package shall not be greater than 5. As faras possible, equal number of leas shall be prepared fromeach of the selected package. The number of leas soselected from the lot shall be equal to 30.

7.3.1.1 In case single yarn breaking tenacity isdetermined, the number of tests shall not be lessthan 50.

7.4 Criteria for Conformity

The lot shall be considered as conforming to therequirements of this standard, if the followingconditions are satisfied:

a)

b)

c)

The average count calculated from the testresults lies within the tolerances specified andthe coefficient of variation for the count is lessthan the specified values.

The count lea strength product or breakingtenacity, as the case may be, is greater than orequal to the minimum specified values, andthe coefficient of variation is less than thespecified values.

All the test specimens examined for defects,unevenness, imperfection, moisture, shallsatisfy the relevant requirements.

n

*

3

1S 13684:2006

[S No,

199:1989

293:1980

1315:1977

1347:1972

ANNEX A

(Clause 2)

LIST OF REFERRED INDIAN STANDARDS

Tit[e

Textiles — Estimation of moisture,total size or finish, ash and fattymatter in grey and finished cottontextile materials (third revision)

Code for seaworthy packagingof cotton yarn and cloth (thirdrevision)

Method for determination of lineardensity of yarns spun on cottonsystem (llr.strevision)

Inland packaging of cotton cloth andyam @st revision)

IS No.

1670:1991

1671:1977

3086:1965

3325:1965

4905:1968

Title ~

Textiles — Yarn — Determination of ~breaking load and elongation atbreak of single strand (secondrevision) I

Method for determination of yarnstrength parameters of yarn spun on

1cotton system (first revision) ~

Code for seaworthy packaging ofcotton hosiery yarn and goods

Code for inland packaging of cottonhosiery yarn and goods

Methods for random sampling

.

ANNEX B

(Clause 4.2)

COMMON DEFECTS OF YARN ON CONE!YCHEESE AND HANKS

B-1 COMMON DEFECTS OF YARN ON CONES/CHEESES

a)

b)

c)

d)

e)

9

g)h)

Stitches of more than 2.5 cm in length at thebase;

Excessive stitches at the nose;

Soft cones or cheeses;

Hard cones/cheeses;

Collapsed cones or cheeses;

Prominent stains inclusive of chalk and othermarkings;

Cut threads;

Absence of tail-end where it is required (thelength of the tail-end should not be less than30 cm);

j) Shade variation; and

k) Count mix up.

B-2 COMMON DEFECTS OF YARN ON HANKS

a) Improper leasing;

b) Nose and tail-end not tied with the yarn;

c) Entanglement;

d) Presence of many knots with long tail-ends;

e) Presence of hard waste;

t) Excessive presence of twistlessness, irregulartwist or cork screw effects in case of pliedyarns; and

g) Plying of wrong counts.

4

. . . - ------------- .,... .... . -———..- .

IS 13684:2006

ANNEX C

(F’wewmi)

COMMITTEE COMPOSITION

Man-Made Fibres, Cotton and Their Products Sectional Committee,TX31

Organization

Textiles Committee, Mumbai

Ashima Ltd, Ahmedabad

Central Institute for Research in Cotton Technology, Mumbai

Century Textiles and Industries Ltd, Mumbai

Consumer Guidance Society of India, Mumbai

Directorate General of Supplies and Disposals (Inspection Wing),New Delhi

G T N Textiles, Alwaye, Kerala

Indian Cotton Mills’ Federation, New Delhi

Indian Institute of Technology, Delhi

Indo Rama Textiles Ltd, Pithampur, Madhya Pradesh

Ministry of Defence (DGQA), New Delhi

Ministry of Defence (R&D), New Delhi

OffIce of the Textile Commissioner, Mumbai

Reliance Industries Ltd, Ahmedabad

Rajapalayam Mills Ltd, Rajapalayam

Synthetic and Art Silk Mills Association, Mumbai

The Ahmedabad Textile Industry, Association ResearchAssociation, Abmedabad

The Arvind Mills Ltd, Ahmedabad

The Bombay Textile Research Association, Mumbai

‘rhe Lakshmi Mills Co Ltd, Coimbatore

The Rajasthan Spinning and Weaving Mills Ltd, Kharigram(Bhilwara)

The Southern India Mills’ Association, Coimbatore

The Synthetic and Art Silk Mills Research Association, Mumbai

Vardharnan Spinning and General Mills Ltd, Ludhiana

Veermata Jijabai Technological Institute (VJT1), Mumbai

BIS Directorate General

Representative(s)

SHRI P. K. MONDAL(Chairman)

SHRI S. SHANKAIUAH(Alternate)

SHRJDEEPAKPARLILEKAR

DR G. F. S. HUSSAIN

DR R. P. NACHANE(Ahernafe)

SHRI MAHESHSHARMA

SHRI V. HARIDHARAN(Alternate)

SHRI N. G. WAGLE

SHRIMATIRENUTALWANI(Alternate)

SHRI A. K. SEHGAL

SHRI SUNDERLAL (Alternate)

SHRI V. N, BALAKRJSHNAN

SHRIK. 1’.UMANATHAN(Akmate)

SHRI D. K, NAIRSHRI U. K. JosHI (Alfernate)

PROF B. L, DEOPURAPROFR. CHATTOPADHVAY(Alterrrafe)

SHRIRAKESHGOYAL

REPRESENTATIVE

SHRI R. lNOUSHEKHAR

SHRIAWIOKYADAV(Alternate)

SHRI B. A. PATEL

SHRI S. P GOMBERSHRJVINAYCHATURVEtJI(Alternate)

Representative

SHRI V. S. CHALKE

Stm J. M. GROVER

DR S. REHMAN(Alternate)

REPRESENTATIVE

SHRI G. D. BATWAL

REIVWSENTATIVE

SHRIN. K. SHRJVASTVA

DR K. SELVARAJU

SHRI M. K. BARDHAN

DR ARLBIK. RAKSmT (Alternafe)

SHRI V. K. GOYAL

DR A. R. KHARE

SHRJ S. P. BORKAR(A/terrrate)

SHRI M. S. VERMA, Director and Head (TXD)

4

[Representing Director General (Ex-o#7cio Merrrber)]

Member Secretary

SHRI ANIL KUMAR

Joint Director (TXD), BIS

5

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This Indian Standard has been developed from Dot’: No. TX031 (0550).

Amendments Issued Since Publication

Amend No. Date of Issue Text Affected -

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