Tiêu chuẩn iso 04674 1 2016

© ISO 2016 Rubber or plastics coated fabrics — Determination of tear resistance — Part 1 Constant rate of tear methods Supports textiles revêtus de caoutchouc ou de plastique — Détermination de la rés[.]

Rubber- or plastics-c oated fabrics —

Part 1:

S p ort te xtile s r vê tus de ca utch uc o de plastique —

Déte mination de la résista c a déchirement —

Partie 1: Méth de s à vite sse co sta te de déchirement

S con edition

2 16-1 -1

Refer ence n mb r

COPYRIGHT PROTECTED DOCUMENT

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F reword i v

Introduction v

1 Sc ope 1

2 Nor mati ve r eferenc es 1

3 Terms an definitions 1

4 A pparatus and reag ents 2

5 Atmospheres for c onditioning and testing 2

5.1 For con itioning 2

5.2 For tes ing 2

6 Time- nter val betwe n manufacture and testing 2

7 Metho A — Tong ued (do ble-te r) test piec e 2

7.1 S le tion an pr ep r ation of tes pie es 2

7.2 Pr oc dure 4

7.3 Calculation an ex pres ion of results 5

7.3.1 Trac w ith a se ies of definite peaks 5

7.3.2 Trac w ithout definite peaks 5

8 Metho B — Trouser-shaped (single-te r)test piec e 6

8.1 S le tion an pr ep r ation of tes pie es 6

8.2 Pr oc dure 7

8.3 Calculation an ex pres ion of results 8

9 Precision 8

10 Test rep r t 8

A nne x A (informative)Example of calculatio of te r forc e 9

A nne x B (normative) Wide-w idth trouser -shaped test piec e 11

ISO (he Int ernational Org nization for Stan ardization) is a worldwidefede ation of national s an ards

b dies (ISO membe b dies) The work of pr p ring Int ernational Stan ards is normaly car ied out

through ISO t ech ical committ ees Each membe b dy int er st ed in a subje t for w hich a t ech ical

committ ee has be n es a lshed has the right t o be r pr sent ed on that committ ee Int ernational

org nizations, g overnmental an non-g ove nmental, in laison with ISO, also take part in the work

ISO cola orat es closely with the Int ernational Ele trot ech ical C mmis ion (IEC) on al matt ers of

ele trot ech ical s an ardization

The proc d r s used t o develo this document an those int en ed for it furthe maint enanc ar

desc ibed in the ISO/IEC Dir ctives, Part 1 In p rticular the dife ent a pro al c it eria ne ded for the

dife ent ty es of ISO document should be not ed This document was draft ed in ac ordanc with the

edit orial rules of the ISO/IEC Dir ctives, Part 2 ( e www.iso.org dir ctives)

A tt ention is drawn t o the p s ibi ity that some of the element of this document ma be the subje t of

p t ent right ISO shal not be held r sponsible for identifying any or al such p t ent right Detais of

any p t ent right identified d ring the develo ment of the document wi be in the Introd ction an / r

on the ISO ls of p t ent de larations r c ived ( e www.iso.org p t ent )

Any trade name used in this document is information given for the convenienc of use s an does not

cons itut e an en orsement

For an ex lanation on the meaning of ISO spe ific t erms an ex r s ions r lated to conformity as es ment,

as wel as information a out ISO’s adhe enc to the Wor ld Trade Org nization (WTO) principles in the

Te h ical Bar ie s to Trade (TBT) se the folowing URL: www.iso.org/ iso/for word.html

The committ ee r sp nsible for this document is ISO/TC 45, R ub e a d ru be produc ts , Subcommitt ee

SC 4, Produc ts (othe th n h s es)

This se on edition canc ls an r plac s the firs edition (ISO 46 4-1:2 0 ), w hich has be n t ech icaly

r vised The chang es ar as folow s

— The title of Clause 4 has be n chang ed t o “Ap aratus an r ag ent ” The clamping devic an some

r ag ent ha e be n ad ed

— Cla use 5has be n broken down t o two subclauses for con itioning an for t es ing r spe tively The

atmosphe e of con itioning has be n r fe r d t o the con ition of “1” spe ified in ISO 2 3 :1 8

— New Clause6 “Time-int erv l between man facturing an t es ing” has be n ad ed

— In 7.1, 7.2, 8.1, an 8.2, the wet t es ing hasbe n mo ed from Clause 5with p rtial modification

— In 7.2 an 8.2, the proc d r of han l ng a normal t es r sult has be n incorp rat ed The NOTE in

each subcla usehas be n mo ed t o the b dy t ext r spe tively

— In Cla use 1 , it em f)has be n ad ed

— Annex B has be n chang ed t o normative an the b dy t ext format has be n subdivided b ad ing

cla uses

ISO 46 4 consis s of the folowing p rt , u de the g ene al title Ru be - or plas tic s-c oated fbric s —

Dete min tio o tear r s i s ta c e:

— Part 1: Co s ta t rate o tear meth ds

— Part 2 : B ali s tic pendulummeth d

Tearing is amongs the mor usual way s of des ruction for many thin mat erials such asp pe , co t ed or

unco t ed t exties, plas ic f ilms an leathe Know ledg e of the r sis anc of these mat erials t o this ty e

of beha iour isthe efor ve y imp rtant

In practic , t earing can r sult from ve y dife ent cir ums anc s; henc the larg e n mbe of t es

methods that ha e be n develo ed in orde t o pr dict the beha iour of mat erials in v rious situations

The ISO 46 4 se ies deals with initiat ed t earing, i.e the pro a ation of a t ear from an initiating cut

This p rt of ISO 46 4 desc ibes two methods using a t ensie-t es ing machine at cons ant rat e of

elong tion ISO 46 4- 2 desc ibes a dynamic method using the kinetic ene g of a fal ing pen ulum

Rubber- or plastics-c oated fabrics — Determination oftear

Part 1:

WARNING — Per ons using this part of ISO 46 74 sh uld be famiia with normal laboratory

practice This part of ISO 46 74 d es not purport to addres al of the safety pro lems, if any,

as ociated with its use It is the respo sibi ity of the use to establsh appropriate safety and

he lth practices and to ensure compl ance with any national re ulatory conditions

This p rt of ISO 46 4 spe ifies two methods for det ermining the for es ne es ary t o initiat e an

pro a at e t earing of a co t ed fa ric using the cons ant rat e of t ear method The methodsdesc ibed ar

the folowing:

— method A:t ongue t ear;

— method B: trouse t ear

2 Normati ve r eferences

The folowing document , in w hole or in p rt, ar normatively r fe enc d in this document an ar

in ispensa le for it a pl cation F or dat ed r fe enc s, only the edition cit ed a pl es F or u dat ed

r fe enc s, the lat es edition of the r fe enc d document ( inclu ing any amen ment )a pl es

ISO 142 , Ru be - or plas tic s-c oated fbric s — Dete min tion o tens ile s tr n th a d elo g tio at br ak

ISO 2 3 :1 8 , R ub e - or plas tic s-c oated fbric s — Sta dard atmos phe es fr c onditio in a d tes tin

ISO 2 8 -1, Ru be - or plas tic s-c oated f bric s — Dete min tio o rol charac te i s tic s — Part 1: Meth ds

fr dete min tio o len th,w idth a d net mas s

ISO 2 0 , Stati s tic al inte pr tatio o tes t r s ults — Es timatio o the mea — Co fidenc e inter val

3 Terms and definitions

F or the purposes of this document, the folowing t ermsand definitions a ply

3.1

pe k

p int on an aut ogra hic trac w he e the gradient, r lative t o the for e v lues r corded, chang es from

p sitive t o neg tive

Note 1t o entry: For te r recordings, a pe k t o b used for calculation is def ined by a drop in for e of at le st 1 %

of the last inc e sing for e value

3.2

length of tear

measur d length of a t ear prod c d b a t earing for e from the initiation of the for e u ti it t ermination

4 A pparatus and reag ents

4.1 C nstant rate of ex tensio tensi e-testing machine, complying with ISO 142 Tear for ces shal

be recorded b an autog raphic recorde If r ecording of for ce an ex tension is o tained b meansof

data-acq isition b ards an softwar e, the fr eq ency of data cole tion shal be not les than 8 s

1

4.2 Clamping devic e, the width of each ja w shal be no les than the width of the portions of the tes

pie e to be clamped, i.e ≥ 5 mm an ≥ 0 mm for a tong ued tes pie e, ≥5 mm for a nor mal tr ouse

tes pie e and ≥ 0 mm for a lar g e tr ouse tes pie e (half of 2 0 mm) F r method B, the jaws shal be

twic as wide as the w idth of the p rtion to be clamped This is ne es ary to ensur e that the two leg s

ar e p sitioned as shown in Fig ur e 6 with the edg es of each leg correctly alg ned with the ax is of force

a plcation

4.3 E uipment in which the test piec es can be immer sed in wate pr ior to wet testing

4.4 Disti led or deionized water , for weting out the tes pie es

4.5 Wet ing ag ent or surfactant

5 Atmospheres for c onditioning and testing

5.1 F r c onditioning

The atmosphe e shal be the method of conditioning “1”spe if ied in ISO 2 3 :1 8

F or fa rics co t ed on one side only, a minimum of 1 h ex osur is r commen ed

F or fa rics co t ed on b th sides, a minimum of 24 h is r commen ed

5.2 F r testing

The atmosphe e shal be sele t ed from A through E spe if ied in ISO 2 3 :1 8 If it is ne es ary t o

control b th t empe atur an h midity, sele t the atmosphe e from A through C

NOTE T e temperature 2 °C is normaly the testing atmosp ere in temperate cou tries an 27 °C is

normal y in tropical an subtropical cou tries

6 Time-interval between manufacture and testing

F or al t es purp ses, the minimum time betwe n the man factur an t es ing shal be 1 h F or

non-prod ct t es s, the ma imum time betwe n man factur an t es ing shal be four we ks an for

ev luations int en ed t o be comp ra le, the t es s, as far as p s ible, shal be car ied out aft er the same

time-int erv l

F or prod ct , unles othe wise a r ed betwe n the int er st ed p rties, the time betwe n the

man factur and t es ing shal not ex ce d 3 months

7 Method A — Tong ued (double-tear) test piec e

7.1 S lection and preparation oftest piec es

S le t 1 t es pie es, each 2 0 mm long × 1 0 mm wide S le t f ive t es pie es in the longitu inal

dir ction an five in the transve se dir ction, from the ful usa le width an length of the sample ( in

ac ordanc with ISO 2 8 -1)

S le t tes pie es for tearing in the transve se dir ction (i.e tearing ac os longitu inal or w arp thr ads

in the case of wo en subs rates) so that their width is p ralel to the longitu inal edge of the co ted fa ric

S le t t es pie es for t earing in the longitu inal dir ction ( i.e t earing ac os transve se or wef thr ads

in the case of wo en subs rat es) so that their width is pe pen icular t o the longitu inal edg e of the

co t ed fa ric

In each t es pie e, cut a t ongue measuring 1 0 mm × 5 mm as shown in Figur s 1 an 2 A cros each

fac of the t es pie e, mark a l ne ABCD at a dis anc of 5 mm from the en of the t ongueas i lus rat ed

in Figur 2

Figure 1 — Principle of tongued test piece

Dimensions in milimetr es

Key

1 mar k in icating en of te r

Figure 2— Dimensio s of tongued test piece

Mark the en of the t ear 2 mm from the u cut en in the mid le of thes rip t o in icat e the p sition of

the t ear at he completion of thet es

When it is r q ir d t o det ermine the pro e ties of wet mat erial, imme se the t es pie es for 24 h in

wat er (4.4), or wat er containing no mor than 0,1% wet ing ag ent or surfactant (4.5), of a out 2 times

the t otal v lume of the t es pie es at he ro m t empe atur Immediat ely aft er r mo al from the wat er,

rinse thoroughly in wat er an t es within 1 min

7.2 Proc edure

A djus the t es machinet o givea rat e of jaw tra e seof (1 0 ± 1 ) mm/min, an sele t the a pro riat e

lo d ca acity rang e E g g e and z ro the aut ogra hic r corde Adjus the jaw separation t o 1 0 mm

Clamp the t ongue of the t es pie e c ntral y an symmetricaly in the jaw so that the lne BC is jus

visible, as i lus rat ed in Figur 3 Clamp the legs of the t es pie e symmetrical y in the othe jaw of the

machine so that the lnes AB an CD ar jus visible an the legs of the t es pie e ar p ralel t o the

t earing for e

S t the t es machine in motion at he spe if ied rat e of tra e se an st op the t es aft er 6 mm of the t es

pie e has be n t orn, i.e at thet ermination l ne

Obse ve if the t ear does not proc ed along the dir ction of for e an w hethe any thr ads slp out from

the fa ric rathe than being t orn The t es is t o be conside ed cor e t if no slp ag e oc urs in the jaw s,

no delamination takes plac betwe n co ting and b se fa ric d ring the t es an the t ear proc eded

an was complet ed along the dir ction of a plcation of the for e Othe r sult shal be r je t ed u les

othe wise they ar ju g ed t o be useful information at the use s’ disc etion an t o be r corded as an

informative v lue in the t es r p rt

When t es ing on wet t es pie es is r q ir d, r mo e the t es pie e from the wat er ( in ac ordanc with

the las p ra ra h in 7.1), pr s it tightly betwe n two she t of blot ing p pe and immediat ely car y

out the t es as desc ibed a ove

If thr e or mor t es pie es ha e t o be r je t ed, conside the method as u suita le

In this case, an if the t es has be n pe formed with normal t es pie es, the t ear r sis anc ma be

as es ed eithe b using anothe method, e.g ISO 46 4- 2, or b r -t es ing b the pr sent method using

larg e t es pie es as desc ibed in An ex B

Dimensions in milimetr es

Figure 3— Meth d of clamping tongued test piece

7.3 Calculation and ex pres ion of results

7.3.1 Trac e with a series of definite pe ks

7.3.1.1 Manual evaluation of te r forc es from the char t r ec or ding

An ex A gives an ex mple of a calculation

Divide the t ear trac , begin ing with the firs peak an en ing with the las , int o four eq al subse tions

( e Annex A) Do not use the f irs subse tion for the calculation From each of the r maining thr e

subse tions, sele t an not e the two highes an the two lowes peaks A peak for calculation is 1 %

dro in for e as def ined in 3.1

If the ev luation of peaks de ived from dense fa rics with larg e n mbe s of thr ads pe c ntimetr is t o

be done from the chart r cording man al y, the spe d of the chart p pe should pr fe a ly be set t o 2:1

in r lation t o the t earing spe d

F or each t es pie e, calculat e the arithmetic mean of the 1 peak v lues o tained, in Newt ons If

r q ir d, r cord the minimum an ma imum peak for e from the thr e subse tions for each t es pie e

F or man al ev luations, a l mit ed n mbe of sele t ed peaks is chosen t o keep calculation time within

ac epta le lmit F or calculations inclu ing al peaks, the ele tronic ev luation method ( e 7.3.1.2) is

r commen ed

From themean calculat ed for each t es pie e, calculat e the overal arithmetic mean of the t ear for e, in

Newt ons, for each dir ction t est ed an rou d it t o two significant f igur s

If r q ir d, calculat e the coefficient of v riation t o the near s 0,1% an the 9 % conf idenc lmit of

the mean v luescalculat ed for each dir ction ( in ac ordanc with ISO 2 0 )

7.3.1.2 Calculation using an electronic devic e

An ex A gives an ex mple of a calculation

Divide the t ear trac , begin ing with the firs peak an en ing with the las , int o four eq al subse tions

( e Annex A) Do not use the f irs subse tion for the calculation From each of the r maining thr e

subse tions, r cord al peaks A peak for calculation ischaract eriz d b at leas a 1 % dro in for e as

def ined in 3.1

F or each t es pie e, calculat e the arithmetic mean using al the peaks r corded

From themean calculat ed for each t es pie e, calculat e the o e al arithmetic mean of the t ear for e, in

Newt ons, for each dir ction t est ed an rou d it t o two significant f igur s

If r q ir d, calculat e the coefficient of v riation t o the near s 0,1 % an the 9 % conf idenc lmit of

the mean v luescalculat ed for each dir ction ( in ac ordanc with ISO 2 0 )

7.3.2 Trac e witho t definite pe ks

When the trac does not show def init e peaks an consis s of a r latively smo th curve as shown in

Figur 4, divide up the trac as in 7.3.1 an ignor the firs subse tion Draw two lnes p ralel t o the

b selne so that one forms a tang ent with the highes p rt of the curve an the othe with the lowes

p rt of the curve Det ermine the for es cor esp n ing t o these l nes an r cord the arithmetic mean as

the r sult

Ex r s the r sult in Newt ons Calculat e the arithmetic mean of the r sult for each dir ction t est ed

an roun it t o two significant f igur s