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 5742-1 (1970): Terms and symbols for sieve bottoms, PartI: Woven and welded wire screens [CED 55: Sieves, Sievingand other Sizing Methods]

TERMS AND

IS : 5742 ( Part I ) - 1970 .

Indian Standard ,. * .,I ,I

SYMBOLS FOR SIEVE ,BOTTOMS

PART 1 WOVEN AND WECtiCD WfRE ,+p$ENSi /, ..,f ,,_, (!

Sieves, Sieving and Other Sizing Methods Sectional Ck~mmiti&;‘BbZ: 19 I’,

chairman DR K. N. MATHUR

National Physical Laboratory,

Hillside Road, New Delhi 12

iembers Rsprcsmting

SH~I S. N. A~OXA Shalimar Wires & Industries Ltd; Uttarpara - Soar D. N. C~AK~ABORTY ( Altsrnutc )

SHRI S. K. BAJORIA Krishanlal Thirani & Co Ltd, Calcutta SHRI S. K. GANDHI ( Ahrnalr )

SHRI N. N. BANERJEE All India Instrument Manufacturers & Dealers Association ( Bombay Region )

SHRI R., R. CHAKRABORTY National Instruments Ltd, Calcutta DR I. C. DOS M. PAS CUDDOU Central Water & Power Commission,New Delhi

SHRI S. V. SURYANARA~NA ( Altmatc ) SHRI HAR~HAND SIN~H The Indian Steel Rr Wire Products Ltd, Jamshedpur

SHRI R. R. KAPLISE ( Aftmats ) DR R. R. HATTIAN~ADI The Associated Cement Companies Ltd, Bombay

DR M. K. GHARPUREY ( Altcmatc ) JOINT DIRECTOR, RESEARCH Research, Designs and Standards, Organization

( F. E. ), RDSO ( Ministry of Railways ) , Lucknow DEPUTY DIRECTOR, RESEARCH

( F. E. ), RDSO ( Alrcmate ) SHRI D. S. JOSHI Hindustan Boilers, Bombay LT-COL R. V. N. KADAMBI Research and Development Organization ( Ministry

of Defence 1 SHRI N. MOHAN RAO (Alternate)

SHRI CHANDRAKANT L. KHAQRAM All India Wire Netting Manufacturers’ Association, Bombay

SHRI V. KRISHNAMOORTEY Directorate General of Technical Development SERI R. N. MALLICK Directorate General of Technical Development Saab H. M. MARWAH Hindustan Wire Netting Co Ltd, Bombay

SHRI G. H. MARWAH ( Alternate) SHRI D. K. MEHTA Tata-Robins-Fraser Ltd, Jamshedpur

SHRI M. H. RAO ( Altematc) SHRI POEM PBAXASH National Physical Laboratory ( CSIR ), New Delhi SHRI R. RAJARAMAN Central Board of Irrigation & Power, New Delhi SHRI E. K. RAYACHANDRAN National Test House, Calcutta

( Continued on page 2 )

INDIAN STANDARDS INST-ITUTION MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

b‘+---* 2 v----4

NEW DELHI

IS:5742 (Part I)-1970

( Continuedffom pagu 1 )

Membs Refmming DR B. Rno The Tata Iron & Steel Co Ltd, Jamshedpur

SHRI D. D.‘BHUPTAF~I ( AItrrnefe ) . Scar .J. R. SAC~DEVA Defence Production Organization ( Ministry of

SHRI K. C. MISRA ( Alternate ) Defence )

SIXBI K. K. SENQUPTA Hindustan Steel Ltd, Dhansar SHRI A. K. SEN ( Alternate )

Sam P. N. SOOD All India Instrument Manufacturers & Dealers Association ( Delhi Region )

SESI P. V. SUBBA RAO The Andhra Scientific Co Ltd, Masulipatam SIIBI K. C. TOSHNIWAL All India Instrument Manufacturers & Dealers

. Association ( Calcutta Region ) SH~I H. C. VERMA Associated Instrument Manufacturers ( India) Private

Ltd. New Delhi SHRI A. V. A. SHASTRI ( Alternate )

SHRI R. NAOARAJAN, Director General, IS1 ( Ex-o#cio M&as) Director ( Civ Engg )

SHRI VINOD KUMAX

Assistant Director ( Civ Engg ), ISI

2

.

IS : 5742 ( Part I ) - 1970

Indian Standard TERMS AND SYMBOLS FOR SIEVE BOTTOMS

PART I WOVEN AND WELDED WIRE SCREENS

0. FOREWORD

0.1 This Indian Standard ( Part I ) was adopted by the Indian Standards Institution on 1 August 1970, after the draft finalized by the Sieves, Sieving and Other Sizing Methods Sectional Committee had been approved by the Civil Engineering Division Council.

0.2 A series of Indian Standards relating to sieves, methods of sieving, wire cloth and perforated plates for industrial sieves and domestic sieves has been prepared or is under preparation. These include a large number of terms and symbols used for defining screen bottoms. The extensive use of these terms has necessitated the preparation of this glossary; Part I of which covers woven and welded wire screens and Part II perforated plates.

0.3 In the formulation of this standard due weightage has been given to international co-ordination among the standards and practices prevailing in different countries in addition to relating it to the practices in the field in this country. This has been met by deriving assistance from the follow- ing publications:

ISO/TC 24/SC 3 (Secretariat-5 ) 8, Terms and abbreviations for woven and welded wire screens. International Organization for Standardization.

DIN 4185 Part I Screen bottoms, definitions and letter symbols for woven screen bottoms. Deutscher Normenausschuss.

1. SCOPE

1.1 This standard gives various terms and their explanations with illustra- tions relating to woven and welded wire screens. The concerned symbols are also given.

3

IS:5742 (Part I)-1970

2. ~~ERMND SYMBOL&FOR WOV&N MD WELDED WIRE

2.1 The terms and symbols for sireen bottoms relating to woven and welded

wire screens hqve been classified into the following main sections-and are given in Table 1:

a) General;

b) Plain weaves;

c) Twill weaves;

d) Dutch weaves;

e) Multiplex;

f) -Plain weaves, precrimped; and

g) Welded mesh.

TABLE 1 TERMS AND SYt%&O~s WOVEN AND WELDED

SL No. TERM SYMBOL EXPLANATION

1. GENERAL 1.1 yyfi) - Single cored round, square or other forms of cross-

section made out of metal or other synthetic material

1.2 Plain wire - Wire, which has not been crimped qr rtaped pnor to weaving

1.3 Precrimped wire - Wire, which haa been crimped prior to we4ving

1.4 Prestamped wire - Wire, which has been stampul prior to weaving

1.5 Wire (strand, thread ) d Measured across the projected level of the finished diameter Warp dl: cloth

Weft d.

IS:574!2 (Part I)-1970

TABLE 1 TERM!3 AND SYMBOLS FOR WOVEN AND WELDED WIRE SCREENS - Contd

SL No.

TERl!t SYXBOL EXFXAXVATI~N

1.6 Warp k ’ All wires, rtrandr or threads running parallel to the cloth selvedge

1.7 Weft s All wires, strands or threads running at right angles to the cloth selvedge

1.8 ~Type of weave - The way in which warp and weft wires (strands or threads ) cross each other

1.9 Screen. opening _ Th;“z; space between the wires, strands or

1.10 Open sieving area - Ratio of the area of the apertures to the total surface area of the cloth in percent

1.11 Centre distance bet- Sum of aperture and half the diameters of the two ween wire (or meah) W&h adjacent wires, strands or threads of diameters

Weft f, dr and d, respectively (W +4 + 4) measured

across the projected level of tbe cloth. The rimpliied measurement W + d is permissible where the cloth is made up of wires (strands, threads ) of identical diameter d ( -d,=d,).

IS:5742 (PartI)-

TABLE1 TERMS AND SYMBOLS FOR WOVEN AND WELDED WIRE SCREENS - Contd

TlOBaS SYMBOL EXPLANATION

1.12 Aperture size W In warp Wk

In weft W.

Distance betwegn two adjacent warp or weft wires ( strands, threads ) measured across the project- ed level of the cloth

1.13 Squaremesh Warp and weft wires (strands, threads ) are the same distance apart wk = W,

1.14 Losgorditsneah - Warp wires ( strands, threads) closer together than weft wires (strands, threads ) wk < W.

6

IS:5742 (Part I)-1970

TABLE 1 TERMS AND SYMBOLS FOR WOVEN AND WELDED WIRE SCREENS - Cod

N”,“. TERM SYMBOL %XPLANATION

1.15 Broad mesh “- Warp wires ( strands, threads ) further apart than weft wires (strands, threads) ti’k > w,

1.16 Rectangle & Formed by plain wires or by wires crimped or stamped vertically to the cloth level, when WQ > WL but WQ < 3w~

I-- wQ -I 1.17 Slot SP Formed by plain wires or by wires crimped or

stamped vertically to the cloth level, when wQ>3&

( Continued )

7

IS: 5742 (Part I ) - I!370

TABI,E 1 TIWbfS AND SYMBOLS FOR WOVEN AND WELDED WIRE SCREENS - Confd

-~ ~ SL

No. TERM SYMBOL &l'LANATION

1.18 Zero mesh - Warp wires (strands br threads) widely spaced weft wirea ( rtranda or threads) aa closely Spaced as possible ( Dutch cloth) W, = 0

2. PLAIN WEAVES

2.1 Plain weave

2.2 Plain weave, double - warp

(Continued)

8

Is15742 (Part I)*1970

TABLE1 TERMS AND WELDED

TEBBl SYMBOL EXPLANATION

2.3 Plain weave, triple - warp

3. TWILL WEAVE (RIGHT OR LEFT LAY )

3.1 Twill weave, 3 shaft, ’ - right lay

3.2 Twill weave, 4 shaft, left lay

9 ( Continued )

IS:!m2 (Part I)-1970

TABLE1 TJUtMSANDSYMBOU3FORWOVENqpJDwELDED WIRE SCREFiNS - Contd /

SL No. TICRM SYMBOL

3.3 Herringbone @vill, - 4 shaft, .twill weave with clmngec

s.4 Satin weave, 5 shaft, right lay

-

c

4.

4.1

DUTCH WEAVE

Single plain Dutch SPW weave, also called raps, cordurey, Dutch or basket weave, or zero mesh .

4.2 Reverse plain Dutch RPD weave, similar to the SPW but woven ‘the -other way’, that ir, thinner and more warp wires, thicker and less P + weft wires

10

( Continued )

IS:!5742 (Part X)-H70

-~

z. TERM SYMBOL EXPLANATION

4.3 Dutch twill weave or DTW double twill weave, has twice the number of weft wires of the same diameter as the SPW cloth ‘ light-right ’ weave

4.4 BMT or ‘OPEN DTW’ is a broad mesh twill weave woven similarly to the D”% cloth, but not ‘light- tight ’ - the weft wires are further apart and slightly irregular

.

BMT

5.

5.1

MULTIPLEX

Twill weave, 4 shaft, multiple strands in warp and weft, left lay multiplex

PMMPLE OF COVEREO

WEF~T ORE

is:5742 (Part I)-1970

TABLE 1 TERMS AND SYwI,$ FOR WOVEiN AND WELDED WIRE ScREEIyS - cwd

TERM SYMBOL EXPLANATION

6.

6.1

PLAIN WEAVES, W~O~$HT&E

Form A - Double - Chp

6.2 Form B -Single inter- mediate crimp

6.3 Form C - Double inter- - mediate crimp

t

( Continued )

12

IS:5742(PartI)-1970

TABLE 1 TERMS AND SYMBOLS FOR WOVEN AND WELDED WIRE SCREENS - Contd

It,“. TERM SYMBOL EXPLANATION

6.4 Form D - Lock crimp

6.5 FOlTIl

crimp E-Flat top

7.. WELDED MESH II_

7.1 Form F - Welded - meah

u ” u v V

13